net/netfilter/nf_tables_api.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
   4  *
   5  * Development of this code funded by Astaro AG (http://www.astaro.com/)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/list.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/netlink.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/rhashtable.h>
  15 #include <linux/audit.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter/nfnetlink.h>
  18 #include <linux/netfilter/nf_tables.h>
  19 #include <net/netfilter/nf_flow_table.h>
  20 #include <net/netfilter/nf_tables_core.h>
  21 #include <net/netfilter/nf_tables.h>
  22 #include <net/netfilter/nf_tables_offload.h>
  23 #include <net/net_namespace.h>
  24 #include <net/sock.h>
  25
  26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
  27
  28 unsigned int nf_tables_net_id __read_mostly;
  29
  30 static LIST_HEAD(nf_tables_expressions);
  31 static LIST_HEAD(nf_tables_objects);
  32 static LIST_HEAD(nf_tables_flowtables);
  33 static LIST_HEAD(nf_tables_destroy_list);
  34 static LIST_HEAD(nf_tables_gc_list);
  35 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  36 static DEFINE_SPINLOCK(nf_tables_gc_list_lock);
  37
  38 enum {
  39         NFT_VALIDATE_SKIP       = 0,
  40         NFT_VALIDATE_NEED,
  41         NFT_VALIDATE_DO,
  42 };
  43
  44 static struct rhltable nft_objname_ht;
  45
  46 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  47 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  48 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  49
  50 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  51 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  52 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  53
  54 static const struct rhashtable_params nft_chain_ht_params = {
  55         .head_offset            = offsetof(struct nft_chain, rhlhead),
  56         .key_offset             = offsetof(struct nft_chain, name),
  57         .hashfn                 = nft_chain_hash,
  58         .obj_hashfn             = nft_chain_hash_obj,
  59         .obj_cmpfn              = nft_chain_hash_cmp,
  60         .automatic_shrinking    = true,
  61 };
  62
  63 static const struct rhashtable_params nft_objname_ht_params = {
  64         .head_offset            = offsetof(struct nft_object, rhlhead),
  65         .key_offset             = offsetof(struct nft_object, key),
  66         .hashfn                 = nft_objname_hash,
  67         .obj_hashfn             = nft_objname_hash_obj,
  68         .obj_cmpfn              = nft_objname_hash_cmp,
  69         .automatic_shrinking    = true,
  70 };
  71
  72 struct nft_audit_data {
  73         struct nft_table *table;
  74         int entries;
  75         int op;
  76         struct list_head list;
  77 };
  78
  79 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  80         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  81         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  82         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  83         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  84         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  85         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  86         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  87         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  88         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  89         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  90         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  91         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  92         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  93         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  94         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  95         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  96         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  97         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  98         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
  99         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
 100         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
 101         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 102         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 103         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 104         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 105         [NFT_MSG_GETSETELEM_RESET] = AUDIT_NFT_OP_SETELEM_RESET,
 106 };
 107
 108 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
 109 {
 110         switch (table->validate_state) {
 111         case NFT_VALIDATE_SKIP:
 112                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 113                 break;
 114         case NFT_VALIDATE_NEED:
 115                 break;
 116         case NFT_VALIDATE_DO:
 117                 if (new_validate_state == NFT_VALIDATE_NEED)
 118                         return;
 119         }
 120
 121         table->validate_state = new_validate_state;
 122 }
 123 static void nf_tables_trans_destroy_work(struct work_struct *w);
 124 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 125
 126 static void nft_trans_gc_work(struct work_struct *work);
 127 static DECLARE_WORK(trans_gc_work, nft_trans_gc_work);
 128
 129 static void nft_ctx_init(struct nft_ctx *ctx,
 130                          struct net *net,
 131                          const struct sk_buff *skb,
 132                          const struct nlmsghdr *nlh,
 133                          u8 family,
 134                          struct nft_table *table,
 135                          struct nft_chain *chain,
 136                          const struct nlattr * const *nla)
 137 {
 138         ctx->net        = net;
 139         ctx->family     = family;
 140         ctx->level      = 0;
 141         ctx->table      = table;
 142         ctx->chain      = chain;
 143         ctx->nla        = nla;
 144         ctx->portid     = NETLINK_CB(skb).portid;
 145         ctx->report     = nlmsg_report(nlh);
 146         ctx->flags      = nlh->nlmsg_flags;
 147         ctx->seq        = nlh->nlmsg_seq;
 148 }
 149
 150 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 151                                              int msg_type, u32 size, gfp_t gfp)
 152 {
 153         struct nft_trans *trans;
 154
 155         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 156         if (trans == NULL)
 157                 return NULL;
 158
 159         INIT_LIST_HEAD(&trans->list);
 160         INIT_LIST_HEAD(&trans->binding_list);
 161         trans->msg_type = msg_type;
 162         trans->ctx      = *ctx;
 163
 164         return trans;
 165 }
 166
 167 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 168                                          int msg_type, u32 size)
 169 {
 170         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 171 }
 172
 173 static void nft_trans_list_del(struct nft_trans *trans)
 174 {
 175         list_del(&trans->list);
 176         list_del(&trans->binding_list);
 177 }
 178
 179 static void nft_trans_destroy(struct nft_trans *trans)
 180 {
 181         nft_trans_list_del(trans);
 182         kfree(trans);
 183 }
 184
 185 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
 186                                  bool bind)
 187 {
 188         struct nftables_pernet *nft_net;
 189         struct net *net = ctx->net;
 190         struct nft_trans *trans;
 191
 192         if (!nft_set_is_anonymous(set))
 193                 return;
 194
 195         nft_net = nft_pernet(net);
 196         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 197                 switch (trans->msg_type) {
 198                 case NFT_MSG_NEWSET:
 199                         if (nft_trans_set(trans) == set)
 200                                 nft_trans_set_bound(trans) = bind;
 201                         break;
 202                 case NFT_MSG_NEWSETELEM:
 203                         if (nft_trans_elem_set(trans) == set)
 204                                 nft_trans_elem_set_bound(trans) = bind;
 205                         break;
 206                 }
 207         }
 208 }
 209
 210 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 211 {
 212         return __nft_set_trans_bind(ctx, set, true);
 213 }
 214
 215 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
 216 {
 217         return __nft_set_trans_bind(ctx, set, false);
 218 }
 219
 220 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
 221                                    struct nft_chain *chain, bool bind)
 222 {
 223         struct nftables_pernet *nft_net;
 224         struct net *net = ctx->net;
 225         struct nft_trans *trans;
 226
 227         if (!nft_chain_binding(chain))
 228                 return;
 229
 230         nft_net = nft_pernet(net);
 231         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 232                 switch (trans->msg_type) {
 233                 case NFT_MSG_NEWCHAIN:
 234                         if (nft_trans_chain(trans) == chain)
 235                                 nft_trans_chain_bound(trans) = bind;
 236                         break;
 237                 case NFT_MSG_NEWRULE:
 238                         if (trans->ctx.chain == chain)
 239                                 nft_trans_rule_bound(trans) = bind;
 240                         break;
 241                 }
 242         }
 243 }
 244
 245 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
 246                                  struct nft_chain *chain)
 247 {
 248         __nft_chain_trans_bind(ctx, chain, true);
 249 }
 250
 251 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
 252 {
 253         if (!nft_chain_binding(chain))
 254                 return 0;
 255
 256         if (nft_chain_binding(ctx->chain))
 257                 return -EOPNOTSUPP;
 258
 259         if (chain->bound)
 260                 return -EBUSY;
 261
 262         if (!nft_use_inc(&chain->use))
 263                 return -EMFILE;
 264
 265         chain->bound = true;
 266         nft_chain_trans_bind(ctx, chain);
 267
 268         return 0;
 269 }
 270
 271 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
 272 {
 273         __nft_chain_trans_bind(ctx, chain, false);
 274 }
 275
 276 static int nft_netdev_register_hooks(struct net *net,
 277                                      struct list_head *hook_list)
 278 {
 279         struct nft_hook *hook;
 280         int err, j;
 281
 282         j = 0;
 283         list_for_each_entry(hook, hook_list, list) {
 284                 err = nf_register_net_hook(net, &hook->ops);
 285                 if (err < 0)
 286                         goto err_register;
 287
 288                 j++;
 289         }
 290         return 0;
 291
 292 err_register:
 293         list_for_each_entry(hook, hook_list, list) {
 294                 if (j-- <= 0)
 295                         break;
 296
 297                 nf_unregister_net_hook(net, &hook->ops);
 298         }
 299         return err;
 300 }
 301
 302 static void nft_netdev_unregister_hooks(struct net *net,
 303                                         struct list_head *hook_list,
 304                                         bool release_netdev)
 305 {
 306         struct nft_hook *hook, *next;
 307
 308         list_for_each_entry_safe(hook, next, hook_list, list) {
 309                 nf_unregister_net_hook(net, &hook->ops);
 310                 if (release_netdev) {
 311                         list_del(&hook->list);
 312                         kfree_rcu(hook, rcu);
 313                 }
 314         }
 315 }
 316
 317 static int nf_tables_register_hook(struct net *net,
 318                                    const struct nft_table *table,
 319                                    struct nft_chain *chain)
 320 {
 321         struct nft_base_chain *basechain;
 322         const struct nf_hook_ops *ops;
 323
 324         if (table->flags & NFT_TABLE_F_DORMANT ||
 325             !nft_is_base_chain(chain))
 326                 return 0;
 327
 328         basechain = nft_base_chain(chain);
 329         ops = &basechain->ops;
 330
 331         if (basechain->type->ops_register)
 332                 return basechain->type->ops_register(net, ops);
 333
 334         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 335                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 336
 337         return nf_register_net_hook(net, &basechain->ops);
 338 }
 339
 340 static void __nf_tables_unregister_hook(struct net *net,
 341                                         const struct nft_table *table,
 342                                         struct nft_chain *chain,
 343                                         bool release_netdev)
 344 {
 345         struct nft_base_chain *basechain;
 346         const struct nf_hook_ops *ops;
 347
 348         if (table->flags & NFT_TABLE_F_DORMANT ||
 349             !nft_is_base_chain(chain))
 350                 return;
 351         basechain = nft_base_chain(chain);
 352         ops = &basechain->ops;
 353
 354         if (basechain->type->ops_unregister)
 355                 return basechain->type->ops_unregister(net, ops);
 356
 357         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 358                 nft_netdev_unregister_hooks(net, &basechain->hook_list,
 359                                             release_netdev);
 360         else
 361                 nf_unregister_net_hook(net, &basechain->ops);
 362 }
 363
 364 static void nf_tables_unregister_hook(struct net *net,
 365                                       const struct nft_table *table,
 366                                       struct nft_chain *chain)
 367 {
 368         return __nf_tables_unregister_hook(net, table, chain, false);
 369 }
 370
 371 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 372 {
 373         struct nftables_pernet *nft_net = nft_pernet(net);
 374
 375         switch (trans->msg_type) {
 376         case NFT_MSG_NEWSET:
 377                 if (!nft_trans_set_update(trans) &&
 378                     nft_set_is_anonymous(nft_trans_set(trans)))
 379                         list_add_tail(&trans->binding_list, &nft_net->binding_list);
 380                 break;
 381         case NFT_MSG_NEWCHAIN:
 382                 if (!nft_trans_chain_update(trans) &&
 383                     nft_chain_binding(nft_trans_chain(trans)))
 384                         list_add_tail(&trans->binding_list, &nft_net->binding_list);
 385                 break;
 386         }
 387
 388         list_add_tail(&trans->list, &nft_net->commit_list);
 389 }
 390
 391 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 392 {
 393         struct nft_trans *trans;
 394
 395         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 396         if (trans == NULL)
 397                 return -ENOMEM;
 398
 399         if (msg_type == NFT_MSG_NEWTABLE)
 400                 nft_activate_next(ctx->net, ctx->table);
 401
 402         nft_trans_commit_list_add_tail(ctx->net, trans);
 403         return 0;
 404 }
 405
 406 static int nft_deltable(struct nft_ctx *ctx)
 407 {
 408         int err;
 409
 410         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 411         if (err < 0)
 412                 return err;
 413
 414         nft_deactivate_next(ctx->net, ctx->table);
 415         return err;
 416 }
 417
 418 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 419 {
 420         struct nft_trans *trans;
 421
 422         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 423         if (trans == NULL)
 424                 return ERR_PTR(-ENOMEM);
 425
 426         if (msg_type == NFT_MSG_NEWCHAIN) {
 427                 nft_activate_next(ctx->net, ctx->chain);
 428
 429                 if (ctx->nla[NFTA_CHAIN_ID]) {
 430                         nft_trans_chain_id(trans) =
 431                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 432                 }
 433         }
 434         nft_trans_chain(trans) = ctx->chain;
 435         nft_trans_commit_list_add_tail(ctx->net, trans);
 436
 437         return trans;
 438 }
 439
 440 static int nft_delchain(struct nft_ctx *ctx)
 441 {
 442         struct nft_trans *trans;
 443
 444         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 445         if (IS_ERR(trans))
 446                 return PTR_ERR(trans);
 447
 448         nft_use_dec(&ctx->table->use);
 449         nft_deactivate_next(ctx->net, ctx->chain);
 450
 451         return 0;
 452 }
 453
 454 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
 455 {
 456         struct nft_expr *expr;
 457
 458         expr = nft_expr_first(rule);
 459         while (nft_expr_more(rule, expr)) {
 460                 if (expr->ops->activate)
 461                         expr->ops->activate(ctx, expr);
 462
 463                 expr = nft_expr_next(expr);
 464         }
 465 }
 466
 467 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
 468                               enum nft_trans_phase phase)
 469 {
 470         struct nft_expr *expr;
 471
 472         expr = nft_expr_first(rule);
 473         while (nft_expr_more(rule, expr)) {
 474                 if (expr->ops->deactivate)
 475                         expr->ops->deactivate(ctx, expr, phase);
 476
 477                 expr = nft_expr_next(expr);
 478         }
 479 }
 480
 481 static int
 482 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 483 {
 484         /* You cannot delete the same rule twice */
 485         if (nft_is_active_next(ctx->net, rule)) {
 486                 nft_deactivate_next(ctx->net, rule);
 487                 nft_use_dec(&ctx->chain->use);
 488                 return 0;
 489         }
 490         return -ENOENT;
 491 }
 492
 493 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 494                                             struct nft_rule *rule)
 495 {
 496         struct nft_trans *trans;
 497
 498         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 499         if (trans == NULL)
 500                 return NULL;
 501
 502         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 503                 nft_trans_rule_id(trans) =
 504                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 505         }
 506         nft_trans_rule(trans) = rule;
 507         nft_trans_commit_list_add_tail(ctx->net, trans);
 508
 509         return trans;
 510 }
 511
 512 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 513 {
 514         struct nft_flow_rule *flow;
 515         struct nft_trans *trans;
 516         int err;
 517
 518         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 519         if (trans == NULL)
 520                 return -ENOMEM;
 521
 522         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 523                 flow = nft_flow_rule_create(ctx->net, rule);
 524                 if (IS_ERR(flow)) {
 525                         nft_trans_destroy(trans);
 526                         return PTR_ERR(flow);
 527                 }
 528
 529                 nft_trans_flow_rule(trans) = flow;
 530         }
 531
 532         err = nf_tables_delrule_deactivate(ctx, rule);
 533         if (err < 0) {
 534                 nft_trans_destroy(trans);
 535                 return err;
 536         }
 537         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 538
 539         return 0;
 540 }
 541
 542 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 543 {
 544         struct nft_rule *rule;
 545         int err;
 546
 547         list_for_each_entry(rule, &ctx->chain->rules, list) {
 548                 if (!nft_is_active_next(ctx->net, rule))
 549                         continue;
 550
 551                 err = nft_delrule(ctx, rule);
 552                 if (err < 0)
 553                         return err;
 554         }
 555         return 0;
 556 }
 557
 558 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 559                                struct nft_set *set,
 560                                const struct nft_set_desc *desc)
 561 {
 562         struct nft_trans *trans;
 563
 564         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 565         if (trans == NULL)
 566                 return -ENOMEM;
 567
 568         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
 569                 nft_trans_set_id(trans) =
 570                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 571                 nft_activate_next(ctx->net, set);
 572         }
 573         nft_trans_set(trans) = set;
 574         if (desc) {
 575                 nft_trans_set_update(trans) = true;
 576                 nft_trans_set_gc_int(trans) = desc->gc_int;
 577                 nft_trans_set_timeout(trans) = desc->timeout;
 578                 nft_trans_set_size(trans) = desc->size;
 579         }
 580         nft_trans_commit_list_add_tail(ctx->net, trans);
 581
 582         return 0;
 583 }
 584
 585 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 586                              struct nft_set *set)
 587 {
 588         return __nft_trans_set_add(ctx, msg_type, set, NULL);
 589 }
 590
 591 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
 592                                   struct nft_set *set,
 593                                   const struct nft_set_iter *iter,
 594                                   struct nft_set_elem *elem)
 595 {
 596         nft_setelem_data_deactivate(ctx->net, set, elem);
 597
 598         return 0;
 599 }
 600
 601 struct nft_set_elem_catchall {
 602         struct list_head        list;
 603         struct rcu_head         rcu;
 604         void                    *elem;
 605 };
 606
 607 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
 608                                         struct nft_set *set)
 609 {
 610         u8 genmask = nft_genmask_next(ctx->net);
 611         struct nft_set_elem_catchall *catchall;
 612         struct nft_set_elem elem;
 613         struct nft_set_ext *ext;
 614
 615         list_for_each_entry(catchall, &set->catchall_list, list) {
 616                 ext = nft_set_elem_ext(set, catchall->elem);
 617                 if (!nft_set_elem_active(ext, genmask))
 618                         continue;
 619
 620                 elem.priv = catchall->elem;
 621                 nft_setelem_data_deactivate(ctx->net, set, &elem);
 622                 break;
 623         }
 624 }
 625
 626 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
 627 {
 628         struct nft_set_iter iter = {
 629                 .genmask        = nft_genmask_next(ctx->net),
 630                 .fn             = nft_mapelem_deactivate,
 631         };
 632
 633         set->ops->walk(ctx, set, &iter);
 634         WARN_ON_ONCE(iter.err);
 635
 636         nft_map_catchall_deactivate(ctx, set);
 637 }
 638
 639 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 640 {
 641         int err;
 642
 643         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 644         if (err < 0)
 645                 return err;
 646
 647         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
 648                 nft_map_deactivate(ctx, set);
 649
 650         nft_deactivate_next(ctx->net, set);
 651         nft_use_dec(&ctx->table->use);
 652
 653         return err;
 654 }
 655
 656 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 657                              struct nft_object *obj)
 658 {
 659         struct nft_trans *trans;
 660
 661         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 662         if (trans == NULL)
 663                 return -ENOMEM;
 664
 665         if (msg_type == NFT_MSG_NEWOBJ)
 666                 nft_activate_next(ctx->net, obj);
 667
 668         nft_trans_obj(trans) = obj;
 669         nft_trans_commit_list_add_tail(ctx->net, trans);
 670
 671         return 0;
 672 }
 673
 674 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 675 {
 676         int err;
 677
 678         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 679         if (err < 0)
 680                 return err;
 681
 682         nft_deactivate_next(ctx->net, obj);
 683         nft_use_dec(&ctx->table->use);
 684
 685         return err;
 686 }
 687
 688 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 689                                    struct nft_flowtable *flowtable)
 690 {
 691         struct nft_trans *trans;
 692
 693         trans = nft_trans_alloc(ctx, msg_type,
 694                                 sizeof(struct nft_trans_flowtable));
 695         if (trans == NULL)
 696                 return -ENOMEM;
 697
 698         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 699                 nft_activate_next(ctx->net, flowtable);
 700
 701         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
 702         nft_trans_flowtable(trans) = flowtable;
 703         nft_trans_commit_list_add_tail(ctx->net, trans);
 704
 705         return 0;
 706 }
 707
 708 static int nft_delflowtable(struct nft_ctx *ctx,
 709                             struct nft_flowtable *flowtable)
 710 {
 711         int err;
 712
 713         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 714         if (err < 0)
 715                 return err;
 716
 717         nft_deactivate_next(ctx->net, flowtable);
 718         nft_use_dec(&ctx->table->use);
 719
 720         return err;
 721 }
 722
 723 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
 724 {
 725         int i;
 726
 727         for (i = track->regs[dreg].num_reg; i > 0; i--)
 728                 __nft_reg_track_cancel(track, dreg - i);
 729 }
 730
 731 static void __nft_reg_track_update(struct nft_regs_track *track,
 732                                    const struct nft_expr *expr,
 733                                    u8 dreg, u8 num_reg)
 734 {
 735         track->regs[dreg].selector = expr;
 736         track->regs[dreg].bitwise = NULL;
 737         track->regs[dreg].num_reg = num_reg;
 738 }
 739
 740 void nft_reg_track_update(struct nft_regs_track *track,
 741                           const struct nft_expr *expr, u8 dreg, u8 len)
 742 {
 743         unsigned int regcount;
 744         int i;
 745
 746         __nft_reg_track_clobber(track, dreg);
 747
 748         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 749         for (i = 0; i < regcount; i++, dreg++)
 750                 __nft_reg_track_update(track, expr, dreg, i);
 751 }
 752 EXPORT_SYMBOL_GPL(nft_reg_track_update);
 753
 754 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
 755 {
 756         unsigned int regcount;
 757         int i;
 758
 759         __nft_reg_track_clobber(track, dreg);
 760
 761         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 762         for (i = 0; i < regcount; i++, dreg++)
 763                 __nft_reg_track_cancel(track, dreg);
 764 }
 765 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
 766
 767 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
 768 {
 769         track->regs[dreg].selector = NULL;
 770         track->regs[dreg].bitwise = NULL;
 771         track->regs[dreg].num_reg = 0;
 772 }
 773 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
 774
 775 /*
 776  * Tables
 777  */
 778
 779 static struct nft_table *nft_table_lookup(const struct net *net,
 780                                           const struct nlattr *nla,
 781                                           u8 family, u8 genmask, u32 nlpid)
 782 {
 783         struct nftables_pernet *nft_net;
 784         struct nft_table *table;
 785
 786         if (nla == NULL)
 787                 return ERR_PTR(-EINVAL);
 788
 789         nft_net = nft_pernet(net);
 790         list_for_each_entry_rcu(table, &nft_net->tables, list,
 791                                 lockdep_is_held(&nft_net->commit_mutex)) {
 792                 if (!nla_strcmp(nla, table->name) &&
 793                     table->family == family &&
 794                     nft_active_genmask(table, genmask)) {
 795                         if (nft_table_has_owner(table) &&
 796                             nlpid && table->nlpid != nlpid)
 797                                 return ERR_PTR(-EPERM);
 798
 799                         return table;
 800                 }
 801         }
 802
 803         return ERR_PTR(-ENOENT);
 804 }
 805
 806 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 807                                                    const struct nlattr *nla,
 808                                                    int family, u8 genmask, u32 nlpid)
 809 {
 810         struct nftables_pernet *nft_net;
 811         struct nft_table *table;
 812
 813         nft_net = nft_pernet(net);
 814         list_for_each_entry(table, &nft_net->tables, list) {
 815                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 816                     table->family == family &&
 817                     nft_active_genmask(table, genmask)) {
 818                         if (nft_table_has_owner(table) &&
 819                             nlpid && table->nlpid != nlpid)
 820                                 return ERR_PTR(-EPERM);
 821
 822                         return table;
 823                 }
 824         }
 825
 826         return ERR_PTR(-ENOENT);
 827 }
 828
 829 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 830 {
 831         return ++table->hgenerator;
 832 }
 833
 834 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 835
 836 static const struct nft_chain_type *
 837 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 838 {
 839         if (family >= NFPROTO_NUMPROTO ||
 840             type >= NFT_CHAIN_T_MAX)
 841                 return NULL;
 842
 843         return chain_type[family][type];
 844 }
 845
 846 static const struct nft_chain_type *
 847 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 848 {
 849         const struct nft_chain_type *type;
 850         int i;
 851
 852         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 853                 type = __nft_chain_type_get(family, i);
 854                 if (!type)
 855                         continue;
 856                 if (!nla_strcmp(nla, type->name))
 857                         return type;
 858         }
 859         return NULL;
 860 }
 861
 862 struct nft_module_request {
 863         struct list_head        list;
 864         char                    module[MODULE_NAME_LEN];
 865         bool                    done;
 866 };
 867
 868 #ifdef CONFIG_MODULES
 869 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 870                                       ...)
 871 {
 872         char module_name[MODULE_NAME_LEN];
 873         struct nftables_pernet *nft_net;
 874         struct nft_module_request *req;
 875         va_list args;
 876         int ret;
 877
 878         va_start(args, fmt);
 879         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 880         va_end(args);
 881         if (ret >= MODULE_NAME_LEN)
 882                 return 0;
 883
 884         nft_net = nft_pernet(net);
 885         list_for_each_entry(req, &nft_net->module_list, list) {
 886                 if (!strcmp(req->module, module_name)) {
 887                         if (req->done)
 888                                 return 0;
 889
 890                         /* A request to load this module already exists. */
 891                         return -EAGAIN;
 892                 }
 893         }
 894
 895         req = kmalloc(sizeof(*req), GFP_KERNEL);
 896         if (!req)
 897                 return -ENOMEM;
 898
 899         req->done = false;
 900         strscpy(req->module, module_name, MODULE_NAME_LEN);
 901         list_add_tail(&req->list, &nft_net->module_list);
 902
 903         return -EAGAIN;
 904 }
 905 EXPORT_SYMBOL_GPL(nft_request_module);
 906 #endif
 907
 908 static void lockdep_nfnl_nft_mutex_not_held(void)
 909 {
 910 #ifdef CONFIG_PROVE_LOCKING
 911         if (debug_locks)
 912                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 913 #endif
 914 }
 915
 916 static const struct nft_chain_type *
 917 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 918                             u8 family, bool autoload)
 919 {
 920         const struct nft_chain_type *type;
 921
 922         type = __nf_tables_chain_type_lookup(nla, family);
 923         if (type != NULL)
 924                 return type;
 925
 926         lockdep_nfnl_nft_mutex_not_held();
 927 #ifdef CONFIG_MODULES
 928         if (autoload) {
 929                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 930                                        nla_len(nla),
 931                                        (const char *)nla_data(nla)) == -EAGAIN)
 932                         return ERR_PTR(-EAGAIN);
 933         }
 934 #endif
 935         return ERR_PTR(-ENOENT);
 936 }
 937
 938 static __be16 nft_base_seq(const struct net *net)
 939 {
 940         struct nftables_pernet *nft_net = nft_pernet(net);
 941
 942         return htons(nft_net->base_seq & 0xffff);
 943 }
 944
 945 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 946         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 947                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 948         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 949         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 950         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 951                                     .len = NFT_USERDATA_MAXLEN }
 952 };
 953
 954 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 955                                      u32 portid, u32 seq, int event, u32 flags,
 956                                      int family, const struct nft_table *table)
 957 {
 958         struct nlmsghdr *nlh;
 959
 960         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 961         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 962                            NFNETLINK_V0, nft_base_seq(net));
 963         if (!nlh)
 964                 goto nla_put_failure;
 965
 966         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 967             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 968             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 969                          NFTA_TABLE_PAD))
 970                 goto nla_put_failure;
 971
 972         if (event == NFT_MSG_DELTABLE) {
 973                 nlmsg_end(skb, nlh);
 974                 return 0;
 975         }
 976
 977         if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
 978                          htonl(table->flags & NFT_TABLE_F_MASK)))
 979                 goto nla_put_failure;
 980
 981         if (nft_table_has_owner(table) &&
 982             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 983                 goto nla_put_failure;
 984
 985         if (table->udata) {
 986                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 987                         goto nla_put_failure;
 988         }
 989
 990         nlmsg_end(skb, nlh);
 991         return 0;
 992
 993 nla_put_failure:
 994         nlmsg_trim(skb, nlh);
 995         return -1;
 996 }
 997
 998 struct nftnl_skb_parms {
 999         bool report;
1000 };
1001 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
1002
1003 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
1004                                struct list_head *notify_list)
1005 {
1006         NFT_CB(skb).report = report;
1007         list_add_tail(&skb->list, notify_list);
1008 }
1009
1010 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
1011 {
1012         struct nftables_pernet *nft_net;
1013         struct sk_buff *skb;
1014         u16 flags = 0;
1015         int err;
1016
1017         if (!ctx->report &&
1018             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1019                 return;
1020
1021         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1022         if (skb == NULL)
1023                 goto err;
1024
1025         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1026                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1027
1028         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
1029                                         event, flags, ctx->family, ctx->table);
1030         if (err < 0) {
1031                 kfree_skb(skb);
1032                 goto err;
1033         }
1034
1035         nft_net = nft_pernet(ctx->net);
1036         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1037         return;
1038 err:
1039         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1040 }
1041
1042 static int nf_tables_dump_tables(struct sk_buff *skb,
1043                                  struct netlink_callback *cb)
1044 {
1045         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1046         struct nftables_pernet *nft_net;
1047         const struct nft_table *table;
1048         unsigned int idx = 0, s_idx = cb->args[0];
1049         struct net *net = sock_net(skb->sk);
1050         int family = nfmsg->nfgen_family;
1051
1052         rcu_read_lock();
1053         nft_net = nft_pernet(net);
1054         cb->seq = READ_ONCE(nft_net->base_seq);
1055
1056         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1057                 if (family != NFPROTO_UNSPEC && family != table->family)
1058                         continue;
1059
1060                 if (idx < s_idx)
1061                         goto cont;
1062                 if (idx > s_idx)
1063                         memset(&cb->args[1], 0,
1064                                sizeof(cb->args) - sizeof(cb->args[0]));
1065                 if (!nft_is_active(net, table))
1066                         continue;
1067                 if (nf_tables_fill_table_info(skb, net,
1068                                               NETLINK_CB(cb->skb).portid,
1069                                               cb->nlh->nlmsg_seq,
1070                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
1071                                               table->family, table) < 0)
1072                         goto done;
1073
1074                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1075 cont:
1076                 idx++;
1077         }
1078 done:
1079         rcu_read_unlock();
1080         cb->args[0] = idx;
1081         return skb->len;
1082 }
1083
1084 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1085                                       const struct nlmsghdr *nlh,
1086                                       struct netlink_dump_control *c)
1087 {
1088         int err;
1089
1090         if (!try_module_get(THIS_MODULE))
1091                 return -EINVAL;
1092
1093         rcu_read_unlock();
1094         err = netlink_dump_start(nlsk, skb, nlh, c);
1095         rcu_read_lock();
1096         module_put(THIS_MODULE);
1097
1098         return err;
1099 }
1100
1101 /* called with rcu_read_lock held */
1102 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1103                               const struct nlattr * const nla[])
1104 {
1105         struct netlink_ext_ack *extack = info->extack;
1106         u8 genmask = nft_genmask_cur(info->net);
1107         u8 family = info->nfmsg->nfgen_family;
1108         const struct nft_table *table;
1109         struct net *net = info->net;
1110         struct sk_buff *skb2;
1111         int err;
1112
1113         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1114                 struct netlink_dump_control c = {
1115                         .dump = nf_tables_dump_tables,
1116                         .module = THIS_MODULE,
1117                 };
1118
1119                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1120         }
1121
1122         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1123         if (IS_ERR(table)) {
1124                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1125                 return PTR_ERR(table);
1126         }
1127
1128         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1129         if (!skb2)
1130                 return -ENOMEM;
1131
1132         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1133                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1134                                         0, family, table);
1135         if (err < 0)
1136                 goto err_fill_table_info;
1137
1138         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1139
1140 err_fill_table_info:
1141         kfree_skb(skb2);
1142         return err;
1143 }
1144
1145 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1146 {
1147         struct nft_chain *chain;
1148         u32 i = 0;
1149
1150         list_for_each_entry(chain, &table->chains, list) {
1151                 if (!nft_is_active_next(net, chain))
1152                         continue;
1153                 if (!nft_is_base_chain(chain))
1154                         continue;
1155
1156                 if (cnt && i++ == cnt)
1157                         break;
1158
1159                 nf_tables_unregister_hook(net, table, chain);
1160         }
1161 }
1162
1163 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1164 {
1165         struct nft_chain *chain;
1166         int err, i = 0;
1167
1168         list_for_each_entry(chain, &table->chains, list) {
1169                 if (!nft_is_active_next(net, chain))
1170                         continue;
1171                 if (!nft_is_base_chain(chain))
1172                         continue;
1173
1174                 err = nf_tables_register_hook(net, table, chain);
1175                 if (err < 0)
1176                         goto err_register_hooks;
1177
1178                 i++;
1179         }
1180         return 0;
1181
1182 err_register_hooks:
1183         if (i)
1184                 nft_table_disable(net, table, i);
1185         return err;
1186 }
1187
1188 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1189 {
1190         table->flags &= ~NFT_TABLE_F_DORMANT;
1191         nft_table_disable(net, table, 0);
1192         table->flags |= NFT_TABLE_F_DORMANT;
1193 }
1194
1195 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
1196 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
1197 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
1198 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
1199                                          __NFT_TABLE_F_WAS_AWAKEN)
1200
1201 static int nf_tables_updtable(struct nft_ctx *ctx)
1202 {
1203         struct nft_trans *trans;
1204         u32 flags;
1205         int ret;
1206
1207         if (!ctx->nla[NFTA_TABLE_FLAGS])
1208                 return 0;
1209
1210         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1211         if (flags & ~NFT_TABLE_F_MASK)
1212                 return -EOPNOTSUPP;
1213
1214         if (flags == ctx->table->flags)
1215                 return 0;
1216
1217         if ((nft_table_has_owner(ctx->table) &&
1218              !(flags & NFT_TABLE_F_OWNER)) ||
1219             (!nft_table_has_owner(ctx->table) &&
1220              flags & NFT_TABLE_F_OWNER))
1221                 return -EOPNOTSUPP;
1222
1223         /* No dormant off/on/off/on games in single transaction */
1224         if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
1225                 return -EINVAL;
1226
1227         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1228                                 sizeof(struct nft_trans_table));
1229         if (trans == NULL)
1230                 return -ENOMEM;
1231
1232         if ((flags & NFT_TABLE_F_DORMANT) &&
1233             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1234                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1235                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1236                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1237         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1238                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1239                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1240                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1241                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1242                         if (ret < 0)
1243                                 goto err_register_hooks;
1244
1245                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1246                 }
1247         }
1248
1249         nft_trans_table_update(trans) = true;
1250         nft_trans_commit_list_add_tail(ctx->net, trans);
1251
1252         return 0;
1253
1254 err_register_hooks:
1255         nft_trans_destroy(trans);
1256         return ret;
1257 }
1258
1259 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1260 {
1261         const char *name = data;
1262
1263         return jhash(name, strlen(name), seed);
1264 }
1265
1266 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1267 {
1268         const struct nft_chain *chain = data;
1269
1270         return nft_chain_hash(chain->name, 0, seed);
1271 }
1272
1273 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1274                               const void *ptr)
1275 {
1276         const struct nft_chain *chain = ptr;
1277         const char *name = arg->key;
1278
1279         return strcmp(chain->name, name);
1280 }
1281
1282 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1283 {
1284         const struct nft_object_hash_key *k = data;
1285
1286         seed ^= hash_ptr(k->table, 32);
1287
1288         return jhash(k->name, strlen(k->name), seed);
1289 }
1290
1291 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1292 {
1293         const struct nft_object *obj = data;
1294
1295         return nft_objname_hash(&obj->key, 0, seed);
1296 }
1297
1298 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1299                                 const void *ptr)
1300 {
1301         const struct nft_object_hash_key *k = arg->key;
1302         const struct nft_object *obj = ptr;
1303
1304         if (obj->key.table != k->table)
1305                 return -1;
1306
1307         return strcmp(obj->key.name, k->name);
1308 }
1309
1310 static bool nft_supported_family(u8 family)
1311 {
1312         return false
1313 #ifdef CONFIG_NF_TABLES_INET
1314                 || family == NFPROTO_INET
1315 #endif
1316 #ifdef CONFIG_NF_TABLES_IPV4
1317                 || family == NFPROTO_IPV4
1318 #endif
1319 #ifdef CONFIG_NF_TABLES_ARP
1320                 || family == NFPROTO_ARP
1321 #endif
1322 #ifdef CONFIG_NF_TABLES_NETDEV
1323                 || family == NFPROTO_NETDEV
1324 #endif
1325 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1326                 || family == NFPROTO_BRIDGE
1327 #endif
1328 #ifdef CONFIG_NF_TABLES_IPV6
1329                 || family == NFPROTO_IPV6
1330 #endif
1331                 ;
1332 }
1333
1334 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1335                               const struct nlattr * const nla[])
1336 {
1337         struct nftables_pernet *nft_net = nft_pernet(info->net);
1338         struct netlink_ext_ack *extack = info->extack;
1339         u8 genmask = nft_genmask_next(info->net);
1340         u8 family = info->nfmsg->nfgen_family;
1341         struct net *net = info->net;
1342         const struct nlattr *attr;
1343         struct nft_table *table;
1344         struct nft_ctx ctx;
1345         u32 flags = 0;
1346         int err;
1347
1348         if (!nft_supported_family(family))
1349                 return -EOPNOTSUPP;
1350
1351         lockdep_assert_held(&nft_net->commit_mutex);
1352         attr = nla[NFTA_TABLE_NAME];
1353         table = nft_table_lookup(net, attr, family, genmask,
1354                                  NETLINK_CB(skb).portid);
1355         if (IS_ERR(table)) {
1356                 if (PTR_ERR(table) != -ENOENT)
1357                         return PTR_ERR(table);
1358         } else {
1359                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1360                         NL_SET_BAD_ATTR(extack, attr);
1361                         return -EEXIST;
1362                 }
1363                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1364                         return -EOPNOTSUPP;
1365
1366                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1367
1368                 return nf_tables_updtable(&ctx);
1369         }
1370
1371         if (nla[NFTA_TABLE_FLAGS]) {
1372                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1373                 if (flags & ~NFT_TABLE_F_MASK)
1374                         return -EOPNOTSUPP;
1375         }
1376
1377         err = -ENOMEM;
1378         table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1379         if (table == NULL)
1380                 goto err_kzalloc;
1381
1382         table->validate_state = nft_net->validate_state;
1383         table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1384         if (table->name == NULL)
1385                 goto err_strdup;
1386
1387         if (nla[NFTA_TABLE_USERDATA]) {
1388                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1389                 if (table->udata == NULL)
1390                         goto err_table_udata;
1391
1392                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1393         }
1394
1395         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1396         if (err)
1397                 goto err_chain_ht;
1398
1399         INIT_LIST_HEAD(&table->chains);
1400         INIT_LIST_HEAD(&table->sets);
1401         INIT_LIST_HEAD(&table->objects);
1402         INIT_LIST_HEAD(&table->flowtables);
1403         table->family = family;
1404         table->flags = flags;
1405         table->handle = ++nft_net->table_handle;
1406         if (table->flags & NFT_TABLE_F_OWNER)
1407                 table->nlpid = NETLINK_CB(skb).portid;
1408
1409         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1410         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1411         if (err < 0)
1412                 goto err_trans;
1413
1414         list_add_tail_rcu(&table->list, &nft_net->tables);
1415         return 0;
1416 err_trans:
1417         rhltable_destroy(&table->chains_ht);
1418 err_chain_ht:
1419         kfree(table->udata);
1420 err_table_udata:
1421         kfree(table->name);
1422 err_strdup:
1423         kfree(table);
1424 err_kzalloc:
1425         return err;
1426 }
1427
1428 static int nft_flush_table(struct nft_ctx *ctx)
1429 {
1430         struct nft_flowtable *flowtable, *nft;
1431         struct nft_chain *chain, *nc;
1432         struct nft_object *obj, *ne;
1433         struct nft_set *set, *ns;
1434         int err;
1435
1436         list_for_each_entry(chain, &ctx->table->chains, list) {
1437                 if (!nft_is_active_next(ctx->net, chain))
1438                         continue;
1439
1440                 if (nft_chain_binding(chain))
1441                         continue;
1442
1443                 ctx->chain = chain;
1444
1445                 err = nft_delrule_by_chain(ctx);
1446                 if (err < 0)
1447                         goto out;
1448         }
1449
1450         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1451                 if (!nft_is_active_next(ctx->net, set))
1452                         continue;
1453
1454                 if (nft_set_is_anonymous(set))
1455                         continue;
1456
1457                 err = nft_delset(ctx, set);
1458                 if (err < 0)
1459                         goto out;
1460         }
1461
1462         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1463                 if (!nft_is_active_next(ctx->net, flowtable))
1464                         continue;
1465
1466                 err = nft_delflowtable(ctx, flowtable);
1467                 if (err < 0)
1468                         goto out;
1469         }
1470
1471         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1472                 if (!nft_is_active_next(ctx->net, obj))
1473                         continue;
1474
1475                 err = nft_delobj(ctx, obj);
1476                 if (err < 0)
1477                         goto out;
1478         }
1479
1480         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1481                 if (!nft_is_active_next(ctx->net, chain))
1482                         continue;
1483
1484                 if (nft_chain_binding(chain))
1485                         continue;
1486
1487                 ctx->chain = chain;
1488
1489                 err = nft_delchain(ctx);
1490                 if (err < 0)
1491                         goto out;
1492         }
1493
1494         err = nft_deltable(ctx);
1495 out:
1496         return err;
1497 }
1498
1499 static int nft_flush(struct nft_ctx *ctx, int family)
1500 {
1501         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1502         const struct nlattr * const *nla = ctx->nla;
1503         struct nft_table *table, *nt;
1504         int err = 0;
1505
1506         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1507                 if (family != AF_UNSPEC && table->family != family)
1508                         continue;
1509
1510                 ctx->family = table->family;
1511
1512                 if (!nft_is_active_next(ctx->net, table))
1513                         continue;
1514
1515                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1516                         continue;
1517
1518                 if (nla[NFTA_TABLE_NAME] &&
1519                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1520                         continue;
1521
1522                 ctx->table = table;
1523
1524                 err = nft_flush_table(ctx);
1525                 if (err < 0)
1526                         goto out;
1527         }
1528 out:
1529         return err;
1530 }
1531
1532 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1533                               const struct nlattr * const nla[])
1534 {
1535         struct netlink_ext_ack *extack = info->extack;
1536         u8 genmask = nft_genmask_next(info->net);
1537         u8 family = info->nfmsg->nfgen_family;
1538         struct net *net = info->net;
1539         const struct nlattr *attr;
1540         struct nft_table *table;
1541         struct nft_ctx ctx;
1542
1543         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1544         if (family == AF_UNSPEC ||
1545             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1546                 return nft_flush(&ctx, family);
1547
1548         if (nla[NFTA_TABLE_HANDLE]) {
1549                 attr = nla[NFTA_TABLE_HANDLE];
1550                 table = nft_table_lookup_byhandle(net, attr, family, genmask,
1551                                                   NETLINK_CB(skb).portid);
1552         } else {
1553                 attr = nla[NFTA_TABLE_NAME];
1554                 table = nft_table_lookup(net, attr, family, genmask,
1555                                          NETLINK_CB(skb).portid);
1556         }
1557
1558         if (IS_ERR(table)) {
1559                 if (PTR_ERR(table) == -ENOENT &&
1560                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1561                         return 0;
1562
1563                 NL_SET_BAD_ATTR(extack, attr);
1564                 return PTR_ERR(table);
1565         }
1566
1567         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1568             table->use > 0)
1569                 return -EBUSY;
1570
1571         ctx.family = family;
1572         ctx.table = table;
1573
1574         return nft_flush_table(&ctx);
1575 }
1576
1577 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1578 {
1579         if (WARN_ON(ctx->table->use > 0))
1580                 return;
1581
1582         rhltable_destroy(&ctx->table->chains_ht);
1583         kfree(ctx->table->name);
1584         kfree(ctx->table->udata);
1585         kfree(ctx->table);
1586 }
1587
1588 void nft_register_chain_type(const struct nft_chain_type *ctype)
1589 {
1590         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1591         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1592                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1593                 return;
1594         }
1595         chain_type[ctype->family][ctype->type] = ctype;
1596         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1597 }
1598 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1599
1600 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1601 {
1602         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1603         chain_type[ctype->family][ctype->type] = NULL;
1604         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1605 }
1606 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1607
1608 /*
1609  * Chains
1610  */
1611
1612 static struct nft_chain *
1613 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1614 {
1615         struct nft_chain *chain;
1616
1617         list_for_each_entry(chain, &table->chains, list) {
1618                 if (chain->handle == handle &&
1619                     nft_active_genmask(chain, genmask))
1620                         return chain;
1621         }
1622
1623         return ERR_PTR(-ENOENT);
1624 }
1625
1626 static bool lockdep_commit_lock_is_held(const struct net *net)
1627 {
1628 #ifdef CONFIG_PROVE_LOCKING
1629         struct nftables_pernet *nft_net = nft_pernet(net);
1630
1631         return lockdep_is_held(&nft_net->commit_mutex);
1632 #else
1633         return true;
1634 #endif
1635 }
1636
1637 static struct nft_chain *nft_chain_lookup(struct net *net,
1638                                           struct nft_table *table,
1639                                           const struct nlattr *nla, u8 genmask)
1640 {
1641         char search[NFT_CHAIN_MAXNAMELEN + 1];
1642         struct rhlist_head *tmp, *list;
1643         struct nft_chain *chain;
1644
1645         if (nla == NULL)
1646                 return ERR_PTR(-EINVAL);
1647
1648         nla_strscpy(search, nla, sizeof(search));
1649
1650         WARN_ON(!rcu_read_lock_held() &&
1651                 !lockdep_commit_lock_is_held(net));
1652
1653         chain = ERR_PTR(-ENOENT);
1654         rcu_read_lock();
1655         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1656         if (!list)
1657                 goto out_unlock;
1658
1659         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1660                 if (nft_active_genmask(chain, genmask))
1661                         goto out_unlock;
1662         }
1663         chain = ERR_PTR(-ENOENT);
1664 out_unlock:
1665         rcu_read_unlock();
1666         return chain;
1667 }
1668
1669 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1670         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1671                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1672         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1673         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1674                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1675         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1676         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1677         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1678                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1679         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1680         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1681         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1682         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1683                                     .len = NFT_USERDATA_MAXLEN },
1684 };
1685
1686 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1687         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1688         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1689         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1690                                     .len = IFNAMSIZ - 1 },
1691 };
1692
1693 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1694 {
1695         struct nft_stats *cpu_stats, total;
1696         struct nlattr *nest;
1697         unsigned int seq;
1698         u64 pkts, bytes;
1699         int cpu;
1700
1701         if (!stats)
1702                 return 0;
1703
1704         memset(&total, 0, sizeof(total));
1705         for_each_possible_cpu(cpu) {
1706                 cpu_stats = per_cpu_ptr(stats, cpu);
1707                 do {
1708                         seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1709                         pkts = cpu_stats->pkts;
1710                         bytes = cpu_stats->bytes;
1711                 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1712                 total.pkts += pkts;
1713                 total.bytes += bytes;
1714         }
1715         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1716         if (nest == NULL)
1717                 goto nla_put_failure;
1718
1719         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1720                          NFTA_COUNTER_PAD) ||
1721             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1722                          NFTA_COUNTER_PAD))
1723                 goto nla_put_failure;
1724
1725         nla_nest_end(skb, nest);
1726         return 0;
1727
1728 nla_put_failure:
1729         return -ENOSPC;
1730 }
1731
1732 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1733                                    const struct nft_base_chain *basechain,
1734                                    const struct list_head *hook_list)
1735 {
1736         const struct nf_hook_ops *ops = &basechain->ops;
1737         struct nft_hook *hook, *first = NULL;
1738         struct nlattr *nest, *nest_devs;
1739         int n = 0;
1740
1741         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1742         if (nest == NULL)
1743                 goto nla_put_failure;
1744         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1745                 goto nla_put_failure;
1746         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1747                 goto nla_put_failure;
1748
1749         if (nft_base_chain_netdev(family, ops->hooknum)) {
1750                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1751                 if (!nest_devs)
1752                         goto nla_put_failure;
1753
1754                 if (!hook_list)
1755                         hook_list = &basechain->hook_list;
1756
1757                 list_for_each_entry(hook, hook_list, list) {
1758                         if (!first)
1759                                 first = hook;
1760
1761                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1762                                            hook->ops.dev->name))
1763                                 goto nla_put_failure;
1764                         n++;
1765                 }
1766                 nla_nest_end(skb, nest_devs);
1767
1768                 if (n == 1 &&
1769                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1770                         goto nla_put_failure;
1771         }
1772         nla_nest_end(skb, nest);
1773
1774         return 0;
1775 nla_put_failure:
1776         return -1;
1777 }
1778
1779 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1780                                      u32 portid, u32 seq, int event, u32 flags,
1781                                      int family, const struct nft_table *table,
1782                                      const struct nft_chain *chain,
1783                                      const struct list_head *hook_list)
1784 {
1785         struct nlmsghdr *nlh;
1786
1787         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1788         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1789                            NFNETLINK_V0, nft_base_seq(net));
1790         if (!nlh)
1791                 goto nla_put_failure;
1792
1793         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1794             nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1795             nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1796                          NFTA_CHAIN_PAD))
1797                 goto nla_put_failure;
1798
1799         if (event == NFT_MSG_DELCHAIN && !hook_list) {
1800                 nlmsg_end(skb, nlh);
1801                 return 0;
1802         }
1803
1804         if (nft_is_base_chain(chain)) {
1805                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1806                 struct nft_stats __percpu *stats;
1807
1808                 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1809                         goto nla_put_failure;
1810
1811                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1812                                  htonl(basechain->policy)))
1813                         goto nla_put_failure;
1814
1815                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1816                         goto nla_put_failure;
1817
1818                 stats = rcu_dereference_check(basechain->stats,
1819                                               lockdep_commit_lock_is_held(net));
1820                 if (nft_dump_stats(skb, stats))
1821                         goto nla_put_failure;
1822         }
1823
1824         if (chain->flags &&
1825             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1826                 goto nla_put_failure;
1827
1828         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1829                 goto nla_put_failure;
1830
1831         if (chain->udata &&
1832             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1833                 goto nla_put_failure;
1834
1835         nlmsg_end(skb, nlh);
1836         return 0;
1837
1838 nla_put_failure:
1839         nlmsg_trim(skb, nlh);
1840         return -1;
1841 }
1842
1843 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1844                                    const struct list_head *hook_list)
1845 {
1846         struct nftables_pernet *nft_net;
1847         struct sk_buff *skb;
1848         u16 flags = 0;
1849         int err;
1850
1851         if (!ctx->report &&
1852             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1853                 return;
1854
1855         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1856         if (skb == NULL)
1857                 goto err;
1858
1859         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1860                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1861
1862         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1863                                         event, flags, ctx->family, ctx->table,
1864                                         ctx->chain, hook_list);
1865         if (err < 0) {
1866                 kfree_skb(skb);
1867                 goto err;
1868         }
1869
1870         nft_net = nft_pernet(ctx->net);
1871         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1872         return;
1873 err:
1874         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1875 }
1876
1877 static int nf_tables_dump_chains(struct sk_buff *skb,
1878                                  struct netlink_callback *cb)
1879 {
1880         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1881         unsigned int idx = 0, s_idx = cb->args[0];
1882         struct net *net = sock_net(skb->sk);
1883         int family = nfmsg->nfgen_family;
1884         struct nftables_pernet *nft_net;
1885         const struct nft_table *table;
1886         const struct nft_chain *chain;
1887
1888         rcu_read_lock();
1889         nft_net = nft_pernet(net);
1890         cb->seq = READ_ONCE(nft_net->base_seq);
1891
1892         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1893                 if (family != NFPROTO_UNSPEC && family != table->family)
1894                         continue;
1895
1896                 list_for_each_entry_rcu(chain, &table->chains, list) {
1897                         if (idx < s_idx)
1898                                 goto cont;
1899                         if (idx > s_idx)
1900                                 memset(&cb->args[1], 0,
1901                                        sizeof(cb->args) - sizeof(cb->args[0]));
1902                         if (!nft_is_active(net, chain))
1903                                 continue;
1904                         if (nf_tables_fill_chain_info(skb, net,
1905                                                       NETLINK_CB(cb->skb).portid,
1906                                                       cb->nlh->nlmsg_seq,
1907                                                       NFT_MSG_NEWCHAIN,
1908                                                       NLM_F_MULTI,
1909                                                       table->family, table,
1910                                                       chain, NULL) < 0)
1911                                 goto done;
1912
1913                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1914 cont:
1915                         idx++;
1916                 }
1917         }
1918 done:
1919         rcu_read_unlock();
1920         cb->args[0] = idx;
1921         return skb->len;
1922 }
1923
1924 /* called with rcu_read_lock held */
1925 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1926                               const struct nlattr * const nla[])
1927 {
1928         struct netlink_ext_ack *extack = info->extack;
1929         u8 genmask = nft_genmask_cur(info->net);
1930         u8 family = info->nfmsg->nfgen_family;
1931         const struct nft_chain *chain;
1932         struct net *net = info->net;
1933         struct nft_table *table;
1934         struct sk_buff *skb2;
1935         int err;
1936
1937         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1938                 struct netlink_dump_control c = {
1939                         .dump = nf_tables_dump_chains,
1940                         .module = THIS_MODULE,
1941                 };
1942
1943                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1944         }
1945
1946         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1947         if (IS_ERR(table)) {
1948                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1949                 return PTR_ERR(table);
1950         }
1951
1952         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1953         if (IS_ERR(chain)) {
1954                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1955                 return PTR_ERR(chain);
1956         }
1957
1958         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1959         if (!skb2)
1960                 return -ENOMEM;
1961
1962         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1963                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1964                                         0, family, table, chain, NULL);
1965         if (err < 0)
1966                 goto err_fill_chain_info;
1967
1968         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1969
1970 err_fill_chain_info:
1971         kfree_skb(skb2);
1972         return err;
1973 }
1974
1975 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1976         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1977         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1978 };
1979
1980 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1981 {
1982         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1983         struct nft_stats __percpu *newstats;
1984         struct nft_stats *stats;
1985         int err;
1986
1987         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1988                                           nft_counter_policy, NULL);
1989         if (err < 0)
1990                 return ERR_PTR(err);
1991
1992         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1993                 return ERR_PTR(-EINVAL);
1994
1995         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1996         if (newstats == NULL)
1997                 return ERR_PTR(-ENOMEM);
1998
1999         /* Restore old counters on this cpu, no problem. Per-cpu statistics
2000          * are not exposed to userspace.
2001          */
2002         preempt_disable();
2003         stats = this_cpu_ptr(newstats);
2004         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
2005         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
2006         preempt_enable();
2007
2008         return newstats;
2009 }
2010
2011 static void nft_chain_stats_replace(struct nft_trans *trans)
2012 {
2013         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
2014
2015         if (!nft_trans_chain_stats(trans))
2016                 return;
2017
2018         nft_trans_chain_stats(trans) =
2019                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
2020                                     lockdep_commit_lock_is_held(trans->ctx.net));
2021
2022         if (!nft_trans_chain_stats(trans))
2023                 static_branch_inc(&nft_counters_enabled);
2024 }
2025
2026 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
2027 {
2028         struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
2029         struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
2030
2031         if (g0 != g1)
2032                 kvfree(g1);
2033         kvfree(g0);
2034
2035         /* should be NULL either via abort or via successful commit */
2036         WARN_ON_ONCE(chain->blob_next);
2037         kvfree(chain->blob_next);
2038 }
2039
2040 void nf_tables_chain_destroy(struct nft_ctx *ctx)
2041 {
2042         struct nft_chain *chain = ctx->chain;
2043         struct nft_hook *hook, *next;
2044
2045         if (WARN_ON(chain->use > 0))
2046                 return;
2047
2048         /* no concurrent access possible anymore */
2049         nf_tables_chain_free_chain_rules(chain);
2050
2051         if (nft_is_base_chain(chain)) {
2052                 struct nft_base_chain *basechain = nft_base_chain(chain);
2053
2054                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2055                         list_for_each_entry_safe(hook, next,
2056                                                  &basechain->hook_list, list) {
2057                                 list_del_rcu(&hook->list);
2058                                 kfree_rcu(hook, rcu);
2059                         }
2060                 }
2061                 module_put(basechain->type->owner);
2062                 if (rcu_access_pointer(basechain->stats)) {
2063                         static_branch_dec(&nft_counters_enabled);
2064                         free_percpu(rcu_dereference_raw(basechain->stats));
2065                 }
2066                 kfree(chain->name);
2067                 kfree(chain->udata);
2068                 kfree(basechain);
2069         } else {
2070                 kfree(chain->name);
2071                 kfree(chain->udata);
2072                 kfree(chain);
2073         }
2074 }
2075
2076 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2077                                               const struct nlattr *attr)
2078 {
2079         struct net_device *dev;
2080         char ifname[IFNAMSIZ];
2081         struct nft_hook *hook;
2082         int err;
2083
2084         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2085         if (!hook) {
2086                 err = -ENOMEM;
2087                 goto err_hook_alloc;
2088         }
2089
2090         nla_strscpy(ifname, attr, IFNAMSIZ);
2091         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2092          * indirectly serializing all the other holders of the commit_mutex with
2093          * the rtnl_mutex.
2094          */
2095         dev = __dev_get_by_name(net, ifname);
2096         if (!dev) {
2097                 err = -ENOENT;
2098                 goto err_hook_dev;
2099         }
2100         hook->ops.dev = dev;
2101
2102         return hook;
2103
2104 err_hook_dev:
2105         kfree(hook);
2106 err_hook_alloc:
2107         return ERR_PTR(err);
2108 }
2109
2110 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2111                                            const struct nft_hook *this)
2112 {
2113         struct nft_hook *hook;
2114
2115         list_for_each_entry(hook, hook_list, list) {
2116                 if (this->ops.dev == hook->ops.dev)
2117                         return hook;
2118         }
2119
2120         return NULL;
2121 }
2122
2123 static int nf_tables_parse_netdev_hooks(struct net *net,
2124                                         const struct nlattr *attr,
2125                                         struct list_head *hook_list,
2126                                         struct netlink_ext_ack *extack)
2127 {
2128         struct nft_hook *hook, *next;
2129         const struct nlattr *tmp;
2130         int rem, n = 0, err;
2131
2132         nla_for_each_nested(tmp, attr, rem) {
2133                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2134                         err = -EINVAL;
2135                         goto err_hook;
2136                 }
2137
2138                 hook = nft_netdev_hook_alloc(net, tmp);
2139                 if (IS_ERR(hook)) {
2140                         NL_SET_BAD_ATTR(extack, tmp);
2141                         err = PTR_ERR(hook);
2142                         goto err_hook;
2143                 }
2144                 if (nft_hook_list_find(hook_list, hook)) {
2145                         NL_SET_BAD_ATTR(extack, tmp);
2146                         kfree(hook);
2147                         err = -EEXIST;
2148                         goto err_hook;
2149                 }
2150                 list_add_tail(&hook->list, hook_list);
2151                 n++;
2152
2153                 if (n == NFT_NETDEVICE_MAX) {
2154                         err = -EFBIG;
2155                         goto err_hook;
2156                 }
2157         }
2158
2159         return 0;
2160
2161 err_hook:
2162         list_for_each_entry_safe(hook, next, hook_list, list) {
2163                 list_del(&hook->list);
2164                 kfree(hook);
2165         }
2166         return err;
2167 }
2168
2169 struct nft_chain_hook {
2170         u32                             num;
2171         s32                             priority;
2172         const struct nft_chain_type     *type;
2173         struct list_head                list;
2174 };
2175
2176 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2177                                   struct list_head *hook_list,
2178                                   struct netlink_ext_ack *extack, u32 flags)
2179 {
2180         struct nft_hook *hook;
2181         int err;
2182
2183         if (tb[NFTA_HOOK_DEV]) {
2184                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2185                 if (IS_ERR(hook)) {
2186                         NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2187                         return PTR_ERR(hook);
2188                 }
2189
2190                 list_add_tail(&hook->list, hook_list);
2191         } else if (tb[NFTA_HOOK_DEVS]) {
2192                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2193                                                    hook_list, extack);
2194                 if (err < 0)
2195                         return err;
2196
2197         }
2198
2199         if (flags & NFT_CHAIN_HW_OFFLOAD &&
2200             list_empty(hook_list))
2201                 return -EINVAL;
2202
2203         return 0;
2204 }
2205
2206 static int nft_chain_parse_hook(struct net *net,
2207                                 struct nft_base_chain *basechain,
2208                                 const struct nlattr * const nla[],
2209                                 struct nft_chain_hook *hook, u8 family,
2210                                 u32 flags, struct netlink_ext_ack *extack)
2211 {
2212         struct nftables_pernet *nft_net = nft_pernet(net);
2213         struct nlattr *ha[NFTA_HOOK_MAX + 1];
2214         const struct nft_chain_type *type;
2215         int err;
2216
2217         lockdep_assert_held(&nft_net->commit_mutex);
2218         lockdep_nfnl_nft_mutex_not_held();
2219
2220         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2221                                           nla[NFTA_CHAIN_HOOK],
2222                                           nft_hook_policy, NULL);
2223         if (err < 0)
2224                 return err;
2225
2226         if (!basechain) {
2227                 if (!ha[NFTA_HOOK_HOOKNUM] ||
2228                     !ha[NFTA_HOOK_PRIORITY]) {
2229                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2230                         return -ENOENT;
2231                 }
2232
2233                 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2234                 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2235
2236                 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2237                 if (!type)
2238                         return -EOPNOTSUPP;
2239
2240                 if (nla[NFTA_CHAIN_TYPE]) {
2241                         type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2242                                                            family, true);
2243                         if (IS_ERR(type)) {
2244                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2245                                 return PTR_ERR(type);
2246                         }
2247                 }
2248                 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2249                         return -EOPNOTSUPP;
2250
2251                 if (type->type == NFT_CHAIN_T_NAT &&
2252                     hook->priority <= NF_IP_PRI_CONNTRACK)
2253                         return -EOPNOTSUPP;
2254         } else {
2255                 if (ha[NFTA_HOOK_HOOKNUM]) {
2256                         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2257                         if (hook->num != basechain->ops.hooknum)
2258                                 return -EOPNOTSUPP;
2259                 }
2260                 if (ha[NFTA_HOOK_PRIORITY]) {
2261                         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2262                         if (hook->priority != basechain->ops.priority)
2263                                 return -EOPNOTSUPP;
2264                 }
2265
2266                 if (nla[NFTA_CHAIN_TYPE]) {
2267                         type = __nf_tables_chain_type_lookup(nla[NFTA_CHAIN_TYPE],
2268                                                              family);
2269                         if (!type) {
2270                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2271                                 return -ENOENT;
2272                         }
2273                 } else {
2274                         type = basechain->type;
2275                 }
2276         }
2277
2278         if (!try_module_get(type->owner)) {
2279                 if (nla[NFTA_CHAIN_TYPE])
2280                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2281                 return -ENOENT;
2282         }
2283
2284         hook->type = type;
2285
2286         INIT_LIST_HEAD(&hook->list);
2287         if (nft_base_chain_netdev(family, hook->num)) {
2288                 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2289                 if (err < 0) {
2290                         module_put(type->owner);
2291                         return err;
2292                 }
2293         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2294                 module_put(type->owner);
2295                 return -EOPNOTSUPP;
2296         }
2297
2298         return 0;
2299 }
2300
2301 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2302 {
2303         struct nft_hook *h, *next;
2304
2305         list_for_each_entry_safe(h, next, &hook->list, list) {
2306                 list_del(&h->list);
2307                 kfree(h);
2308         }
2309         module_put(hook->type->owner);
2310 }
2311
2312 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2313 {
2314         struct nft_rule_dp_last *lrule;
2315
2316         BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2317
2318         lrule = (struct nft_rule_dp_last *)ptr;
2319         lrule->end.is_last = 1;
2320         lrule->chain = chain;
2321         /* blob size does not include the trailer rule */
2322 }
2323
2324 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2325                                                          unsigned int size)
2326 {
2327         struct nft_rule_blob *blob;
2328
2329         if (size > INT_MAX)
2330                 return NULL;
2331
2332         size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2333
2334         blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2335         if (!blob)
2336                 return NULL;
2337
2338         blob->size = 0;
2339         nft_last_rule(chain, blob->data);
2340
2341         return blob;
2342 }
2343
2344 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2345                                     const struct nft_chain_hook *hook,
2346                                     struct nft_chain *chain)
2347 {
2348         ops->pf                 = family;
2349         ops->hooknum            = hook->num;
2350         ops->priority           = hook->priority;
2351         ops->priv               = chain;
2352         ops->hook               = hook->type->hooks[ops->hooknum];
2353         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2354 }
2355
2356 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2357                               struct nft_chain_hook *hook, u32 flags)
2358 {
2359         struct nft_chain *chain;
2360         struct nft_hook *h;
2361
2362         basechain->type = hook->type;
2363         INIT_LIST_HEAD(&basechain->hook_list);
2364         chain = &basechain->chain;
2365
2366         if (nft_base_chain_netdev(family, hook->num)) {
2367                 list_splice_init(&hook->list, &basechain->hook_list);
2368                 list_for_each_entry(h, &basechain->hook_list, list)
2369                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2370         }
2371         nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2372
2373         chain->flags |= NFT_CHAIN_BASE | flags;
2374         basechain->policy = NF_ACCEPT;
2375         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2376             !nft_chain_offload_support(basechain)) {
2377                 list_splice_init(&basechain->hook_list, &hook->list);
2378                 return -EOPNOTSUPP;
2379         }
2380
2381         flow_block_init(&basechain->flow_block);
2382
2383         return 0;
2384 }
2385
2386 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2387 {
2388         int err;
2389
2390         err = rhltable_insert_key(&table->chains_ht, chain->name,
2391                                   &chain->rhlhead, nft_chain_ht_params);
2392         if (err)
2393                 return err;
2394
2395         list_add_tail_rcu(&chain->list, &table->chains);
2396
2397         return 0;
2398 }
2399
2400 static u64 chain_id;
2401
2402 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2403                               u8 policy, u32 flags,
2404                               struct netlink_ext_ack *extack)
2405 {
2406         const struct nlattr * const *nla = ctx->nla;
2407         struct nft_table *table = ctx->table;
2408         struct nft_base_chain *basechain;
2409         struct net *net = ctx->net;
2410         char name[NFT_NAME_MAXLEN];
2411         struct nft_rule_blob *blob;
2412         struct nft_trans *trans;
2413         struct nft_chain *chain;
2414         int err;
2415
2416         if (nla[NFTA_CHAIN_HOOK]) {
2417                 struct nft_stats __percpu *stats = NULL;
2418                 struct nft_chain_hook hook = {};
2419
2420                 if (flags & NFT_CHAIN_BINDING)
2421                         return -EOPNOTSUPP;
2422
2423                 err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2424                                            extack);
2425                 if (err < 0)
2426                         return err;
2427
2428                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2429                 if (basechain == NULL) {
2430                         nft_chain_release_hook(&hook);
2431                         return -ENOMEM;
2432                 }
2433                 chain = &basechain->chain;
2434
2435                 if (nla[NFTA_CHAIN_COUNTERS]) {
2436                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2437                         if (IS_ERR(stats)) {
2438                                 nft_chain_release_hook(&hook);
2439                                 kfree(basechain);
2440                                 return PTR_ERR(stats);
2441                         }
2442                         rcu_assign_pointer(basechain->stats, stats);
2443                 }
2444
2445                 err = nft_basechain_init(basechain, family, &hook, flags);
2446                 if (err < 0) {
2447                         nft_chain_release_hook(&hook);
2448                         kfree(basechain);
2449                         free_percpu(stats);
2450                         return err;
2451                 }
2452                 if (stats)
2453                         static_branch_inc(&nft_counters_enabled);
2454         } else {
2455                 if (flags & NFT_CHAIN_BASE)
2456                         return -EINVAL;
2457                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2458                         return -EOPNOTSUPP;
2459
2460                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2461                 if (chain == NULL)
2462                         return -ENOMEM;
2463
2464                 chain->flags = flags;
2465         }
2466         ctx->chain = chain;
2467
2468         INIT_LIST_HEAD(&chain->rules);
2469         chain->handle = nf_tables_alloc_handle(table);
2470         chain->table = table;
2471
2472         if (nla[NFTA_CHAIN_NAME]) {
2473                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2474         } else {
2475                 if (!(flags & NFT_CHAIN_BINDING)) {
2476                         err = -EINVAL;
2477                         goto err_destroy_chain;
2478                 }
2479
2480                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2481                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2482         }
2483
2484         if (!chain->name) {
2485                 err = -ENOMEM;
2486                 goto err_destroy_chain;
2487         }
2488
2489         if (nla[NFTA_CHAIN_USERDATA]) {
2490                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2491                 if (chain->udata == NULL) {
2492                         err = -ENOMEM;
2493                         goto err_destroy_chain;
2494                 }
2495                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2496         }
2497
2498         blob = nf_tables_chain_alloc_rules(chain, 0);
2499         if (!blob) {
2500                 err = -ENOMEM;
2501                 goto err_destroy_chain;
2502         }
2503
2504         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2505         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2506
2507         err = nf_tables_register_hook(net, table, chain);
2508         if (err < 0)
2509                 goto err_destroy_chain;
2510
2511         if (!nft_use_inc(&table->use)) {
2512                 err = -EMFILE;
2513                 goto err_use;
2514         }
2515
2516         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2517         if (IS_ERR(trans)) {
2518                 err = PTR_ERR(trans);
2519                 goto err_unregister_hook;
2520         }
2521
2522         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2523         if (nft_is_base_chain(chain))
2524                 nft_trans_chain_policy(trans) = policy;
2525
2526         err = nft_chain_add(table, chain);
2527         if (err < 0) {
2528                 nft_trans_destroy(trans);
2529                 goto err_unregister_hook;
2530         }
2531
2532         return 0;
2533
2534 err_unregister_hook:
2535         nft_use_dec_restore(&table->use);
2536 err_use:
2537         nf_tables_unregister_hook(net, table, chain);
2538 err_destroy_chain:
2539         nf_tables_chain_destroy(ctx);
2540
2541         return err;
2542 }
2543
2544 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2545                               u32 flags, const struct nlattr *attr,
2546                               struct netlink_ext_ack *extack)
2547 {
2548         const struct nlattr * const *nla = ctx->nla;
2549         struct nft_base_chain *basechain = NULL;
2550         struct nft_table *table = ctx->table;
2551         struct nft_chain *chain = ctx->chain;
2552         struct nft_chain_hook hook = {};
2553         struct nft_stats *stats = NULL;
2554         struct nft_hook *h, *next;
2555         struct nf_hook_ops *ops;
2556         struct nft_trans *trans;
2557         bool unregister = false;
2558         int err;
2559
2560         if (chain->flags ^ flags)
2561                 return -EOPNOTSUPP;
2562
2563         INIT_LIST_HEAD(&hook.list);
2564
2565         if (nla[NFTA_CHAIN_HOOK]) {
2566                 if (!nft_is_base_chain(chain)) {
2567                         NL_SET_BAD_ATTR(extack, attr);
2568                         return -EEXIST;
2569                 }
2570
2571                 basechain = nft_base_chain(chain);
2572                 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2573                                            ctx->family, flags, extack);
2574                 if (err < 0)
2575                         return err;
2576
2577                 if (basechain->type != hook.type) {
2578                         nft_chain_release_hook(&hook);
2579                         NL_SET_BAD_ATTR(extack, attr);
2580                         return -EEXIST;
2581                 }
2582
2583                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2584                         list_for_each_entry_safe(h, next, &hook.list, list) {
2585                                 h->ops.pf       = basechain->ops.pf;
2586                                 h->ops.hooknum  = basechain->ops.hooknum;
2587                                 h->ops.priority = basechain->ops.priority;
2588                                 h->ops.priv     = basechain->ops.priv;
2589                                 h->ops.hook     = basechain->ops.hook;
2590
2591                                 if (nft_hook_list_find(&basechain->hook_list, h)) {
2592                                         list_del(&h->list);
2593                                         kfree(h);
2594                                 }
2595                         }
2596                 } else {
2597                         ops = &basechain->ops;
2598                         if (ops->hooknum != hook.num ||
2599                             ops->priority != hook.priority) {
2600                                 nft_chain_release_hook(&hook);
2601                                 NL_SET_BAD_ATTR(extack, attr);
2602                                 return -EEXIST;
2603                         }
2604                 }
2605         }
2606
2607         if (nla[NFTA_CHAIN_HANDLE] &&
2608             nla[NFTA_CHAIN_NAME]) {
2609                 struct nft_chain *chain2;
2610
2611                 chain2 = nft_chain_lookup(ctx->net, table,
2612                                           nla[NFTA_CHAIN_NAME], genmask);
2613                 if (!IS_ERR(chain2)) {
2614                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2615                         err = -EEXIST;
2616                         goto err_hooks;
2617                 }
2618         }
2619
2620         if (nla[NFTA_CHAIN_COUNTERS]) {
2621                 if (!nft_is_base_chain(chain)) {
2622                         err = -EOPNOTSUPP;
2623                         goto err_hooks;
2624                 }
2625
2626                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2627                 if (IS_ERR(stats)) {
2628                         err = PTR_ERR(stats);
2629                         goto err_hooks;
2630                 }
2631         }
2632
2633         if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2634             nft_is_base_chain(chain) &&
2635             !list_empty(&hook.list)) {
2636                 basechain = nft_base_chain(chain);
2637                 ops = &basechain->ops;
2638
2639                 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2640                         err = nft_netdev_register_hooks(ctx->net, &hook.list);
2641                         if (err < 0)
2642                                 goto err_hooks;
2643                 }
2644         }
2645
2646         unregister = true;
2647         err = -ENOMEM;
2648         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2649                                 sizeof(struct nft_trans_chain));
2650         if (trans == NULL)
2651                 goto err_trans;
2652
2653         nft_trans_chain_stats(trans) = stats;
2654         nft_trans_chain_update(trans) = true;
2655
2656         if (nla[NFTA_CHAIN_POLICY])
2657                 nft_trans_chain_policy(trans) = policy;
2658         else
2659                 nft_trans_chain_policy(trans) = -1;
2660
2661         if (nla[NFTA_CHAIN_HANDLE] &&
2662             nla[NFTA_CHAIN_NAME]) {
2663                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2664                 struct nft_trans *tmp;
2665                 char *name;
2666
2667                 err = -ENOMEM;
2668                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2669                 if (!name)
2670                         goto err_trans;
2671
2672                 err = -EEXIST;
2673                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2674                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2675                             tmp->ctx.table == table &&
2676                             nft_trans_chain_update(tmp) &&
2677                             nft_trans_chain_name(tmp) &&
2678                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2679                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2680                                 kfree(name);
2681                                 goto err_trans;
2682                         }
2683                 }
2684
2685                 nft_trans_chain_name(trans) = name;
2686         }
2687
2688         nft_trans_basechain(trans) = basechain;
2689         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2690         list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2691         if (nla[NFTA_CHAIN_HOOK])
2692                 module_put(hook.type->owner);
2693
2694         nft_trans_commit_list_add_tail(ctx->net, trans);
2695
2696         return 0;
2697
2698 err_trans:
2699         free_percpu(stats);
2700         kfree(trans);
2701 err_hooks:
2702         if (nla[NFTA_CHAIN_HOOK]) {
2703                 list_for_each_entry_safe(h, next, &hook.list, list) {
2704                         if (unregister)
2705                                 nf_unregister_net_hook(ctx->net, &h->ops);
2706                         list_del(&h->list);
2707                         kfree_rcu(h, rcu);
2708                 }
2709                 module_put(hook.type->owner);
2710         }
2711
2712         return err;
2713 }
2714
2715 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2716                                                const struct nft_table *table,
2717                                                const struct nlattr *nla, u8 genmask)
2718 {
2719         struct nftables_pernet *nft_net = nft_pernet(net);
2720         u32 id = ntohl(nla_get_be32(nla));
2721         struct nft_trans *trans;
2722
2723         list_for_each_entry(trans, &nft_net->commit_list, list) {
2724                 struct nft_chain *chain = trans->ctx.chain;
2725
2726                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2727                     chain->table == table &&
2728                     id == nft_trans_chain_id(trans) &&
2729                     nft_active_genmask(chain, genmask))
2730                         return chain;
2731         }
2732         return ERR_PTR(-ENOENT);
2733 }
2734
2735 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2736                               const struct nlattr * const nla[])
2737 {
2738         struct nftables_pernet *nft_net = nft_pernet(info->net);
2739         struct netlink_ext_ack *extack = info->extack;
2740         u8 genmask = nft_genmask_next(info->net);
2741         u8 family = info->nfmsg->nfgen_family;
2742         struct nft_chain *chain = NULL;
2743         struct net *net = info->net;
2744         const struct nlattr *attr;
2745         struct nft_table *table;
2746         u8 policy = NF_ACCEPT;
2747         struct nft_ctx ctx;
2748         u64 handle = 0;
2749         u32 flags = 0;
2750
2751         lockdep_assert_held(&nft_net->commit_mutex);
2752
2753         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2754                                  NETLINK_CB(skb).portid);
2755         if (IS_ERR(table)) {
2756                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2757                 return PTR_ERR(table);
2758         }
2759
2760         chain = NULL;
2761         attr = nla[NFTA_CHAIN_NAME];
2762
2763         if (nla[NFTA_CHAIN_HANDLE]) {
2764                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2765                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2766                 if (IS_ERR(chain)) {
2767                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2768                         return PTR_ERR(chain);
2769                 }
2770                 attr = nla[NFTA_CHAIN_HANDLE];
2771         } else if (nla[NFTA_CHAIN_NAME]) {
2772                 chain = nft_chain_lookup(net, table, attr, genmask);
2773                 if (IS_ERR(chain)) {
2774                         if (PTR_ERR(chain) != -ENOENT) {
2775                                 NL_SET_BAD_ATTR(extack, attr);
2776                                 return PTR_ERR(chain);
2777                         }
2778                         chain = NULL;
2779                 }
2780         } else if (!nla[NFTA_CHAIN_ID]) {
2781                 return -EINVAL;
2782         }
2783
2784         if (nla[NFTA_CHAIN_POLICY]) {
2785                 if (chain != NULL &&
2786                     !nft_is_base_chain(chain)) {
2787                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2788                         return -EOPNOTSUPP;
2789                 }
2790
2791                 if (chain == NULL &&
2792                     nla[NFTA_CHAIN_HOOK] == NULL) {
2793                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2794                         return -EOPNOTSUPP;
2795                 }
2796
2797                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2798                 switch (policy) {
2799                 case NF_DROP:
2800                 case NF_ACCEPT:
2801                         break;
2802                 default:
2803                         return -EINVAL;
2804                 }
2805         }
2806
2807         if (nla[NFTA_CHAIN_FLAGS])
2808                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2809         else if (chain)
2810                 flags = chain->flags;
2811
2812         if (flags & ~NFT_CHAIN_FLAGS)
2813                 return -EOPNOTSUPP;
2814
2815         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2816
2817         if (chain != NULL) {
2818                 if (chain->flags & NFT_CHAIN_BINDING)
2819                         return -EINVAL;
2820
2821                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2822                         NL_SET_BAD_ATTR(extack, attr);
2823                         return -EEXIST;
2824                 }
2825                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2826                         return -EOPNOTSUPP;
2827
2828                 flags |= chain->flags & NFT_CHAIN_BASE;
2829                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2830                                           extack);
2831         }
2832
2833         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2834 }
2835
2836 static int nft_delchain_hook(struct nft_ctx *ctx,
2837                              struct nft_base_chain *basechain,
2838                              struct netlink_ext_ack *extack)
2839 {
2840         const struct nft_chain *chain = &basechain->chain;
2841         const struct nlattr * const *nla = ctx->nla;
2842         struct nft_chain_hook chain_hook = {};
2843         struct nft_hook *this, *hook;
2844         LIST_HEAD(chain_del_list);
2845         struct nft_trans *trans;
2846         int err;
2847
2848         err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2849                                    ctx->family, chain->flags, extack);
2850         if (err < 0)
2851                 return err;
2852
2853         list_for_each_entry(this, &chain_hook.list, list) {
2854                 hook = nft_hook_list_find(&basechain->hook_list, this);
2855                 if (!hook) {
2856                         err = -ENOENT;
2857                         goto err_chain_del_hook;
2858                 }
2859                 list_move(&hook->list, &chain_del_list);
2860         }
2861
2862         trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2863                                 sizeof(struct nft_trans_chain));
2864         if (!trans) {
2865                 err = -ENOMEM;
2866                 goto err_chain_del_hook;
2867         }
2868
2869         nft_trans_basechain(trans) = basechain;
2870         nft_trans_chain_update(trans) = true;
2871         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2872         list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2873         nft_chain_release_hook(&chain_hook);
2874
2875         nft_trans_commit_list_add_tail(ctx->net, trans);
2876
2877         return 0;
2878
2879 err_chain_del_hook:
2880         list_splice(&chain_del_list, &basechain->hook_list);
2881         nft_chain_release_hook(&chain_hook);
2882
2883         return err;
2884 }
2885
2886 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2887                               const struct nlattr * const nla[])
2888 {
2889         struct netlink_ext_ack *extack = info->extack;
2890         u8 genmask = nft_genmask_next(info->net);
2891         u8 family = info->nfmsg->nfgen_family;
2892         struct net *net = info->net;
2893         const struct nlattr *attr;
2894         struct nft_table *table;
2895         struct nft_chain *chain;
2896         struct nft_rule *rule;
2897         struct nft_ctx ctx;
2898         u64 handle;
2899         u32 use;
2900         int err;
2901
2902         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2903                                  NETLINK_CB(skb).portid);
2904         if (IS_ERR(table)) {
2905                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2906                 return PTR_ERR(table);
2907         }
2908
2909         if (nla[NFTA_CHAIN_HANDLE]) {
2910                 attr = nla[NFTA_CHAIN_HANDLE];
2911                 handle = be64_to_cpu(nla_get_be64(attr));
2912                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2913         } else {
2914                 attr = nla[NFTA_CHAIN_NAME];
2915                 chain = nft_chain_lookup(net, table, attr, genmask);
2916         }
2917         if (IS_ERR(chain)) {
2918                 if (PTR_ERR(chain) == -ENOENT &&
2919                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2920                         return 0;
2921
2922                 NL_SET_BAD_ATTR(extack, attr);
2923                 return PTR_ERR(chain);
2924         }
2925
2926         if (nft_chain_binding(chain))
2927                 return -EOPNOTSUPP;
2928
2929         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2930
2931         if (nla[NFTA_CHAIN_HOOK]) {
2932                 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2933                         return -EOPNOTSUPP;
2934
2935                 if (nft_is_base_chain(chain)) {
2936                         struct nft_base_chain *basechain = nft_base_chain(chain);
2937
2938                         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2939                                 return nft_delchain_hook(&ctx, basechain, extack);
2940                 }
2941         }
2942
2943         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2944             chain->use > 0)
2945                 return -EBUSY;
2946
2947         use = chain->use;
2948         list_for_each_entry(rule, &chain->rules, list) {
2949                 if (!nft_is_active_next(net, rule))
2950                         continue;
2951                 use--;
2952
2953                 err = nft_delrule(&ctx, rule);
2954                 if (err < 0)
2955                         return err;
2956         }
2957
2958         /* There are rules and elements that are still holding references to us,
2959          * we cannot do a recursive removal in this case.
2960          */
2961         if (use > 0) {
2962                 NL_SET_BAD_ATTR(extack, attr);
2963                 return -EBUSY;
2964         }
2965
2966         return nft_delchain(&ctx);
2967 }
2968
2969 /*
2970  * Expressions
2971  */
2972
2973 /**
2974  *      nft_register_expr - register nf_tables expr type
2975  *      @type: expr type
2976  *
2977  *      Registers the expr type for use with nf_tables. Returns zero on
2978  *      success or a negative errno code otherwise.
2979  */
2980 int nft_register_expr(struct nft_expr_type *type)
2981 {
2982         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2983         if (type->family == NFPROTO_UNSPEC)
2984                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2985         else
2986                 list_add_rcu(&type->list, &nf_tables_expressions);
2987         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2988         return 0;
2989 }
2990 EXPORT_SYMBOL_GPL(nft_register_expr);
2991
2992 /**
2993  *      nft_unregister_expr - unregister nf_tables expr type
2994  *      @type: expr type
2995  *
2996  *      Unregisters the expr typefor use with nf_tables.
2997  */
2998 void nft_unregister_expr(struct nft_expr_type *type)
2999 {
3000         nfnl_lock(NFNL_SUBSYS_NFTABLES);
3001         list_del_rcu(&type->list);
3002         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3003 }
3004 EXPORT_SYMBOL_GPL(nft_unregister_expr);
3005
3006 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
3007                                                        struct nlattr *nla)
3008 {
3009         const struct nft_expr_type *type, *candidate = NULL;
3010
3011         list_for_each_entry(type, &nf_tables_expressions, list) {
3012                 if (!nla_strcmp(nla, type->name)) {
3013                         if (!type->family && !candidate)
3014                                 candidate = type;
3015                         else if (type->family == family)
3016                                 candidate = type;
3017                 }
3018         }
3019         return candidate;
3020 }
3021
3022 #ifdef CONFIG_MODULES
3023 static int nft_expr_type_request_module(struct net *net, u8 family,
3024                                         struct nlattr *nla)
3025 {
3026         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3027                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3028                 return -EAGAIN;
3029
3030         return 0;
3031 }
3032 #endif
3033
3034 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3035                                                      u8 family,
3036                                                      struct nlattr *nla)
3037 {
3038         const struct nft_expr_type *type;
3039
3040         if (nla == NULL)
3041                 return ERR_PTR(-EINVAL);
3042
3043         type = __nft_expr_type_get(family, nla);
3044         if (type != NULL && try_module_get(type->owner))
3045                 return type;
3046
3047         lockdep_nfnl_nft_mutex_not_held();
3048 #ifdef CONFIG_MODULES
3049         if (type == NULL) {
3050                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3051                         return ERR_PTR(-EAGAIN);
3052
3053                 if (nft_request_module(net, "nft-expr-%.*s",
3054                                        nla_len(nla),
3055                                        (char *)nla_data(nla)) == -EAGAIN)
3056                         return ERR_PTR(-EAGAIN);
3057         }
3058 #endif
3059         return ERR_PTR(-ENOENT);
3060 }
3061
3062 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3063         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
3064                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
3065         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
3066 };
3067
3068 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3069                                     const struct nft_expr *expr, bool reset)
3070 {
3071         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3072                 goto nla_put_failure;
3073
3074         if (expr->ops->dump) {
3075                 struct nlattr *data = nla_nest_start_noflag(skb,
3076                                                             NFTA_EXPR_DATA);
3077                 if (data == NULL)
3078                         goto nla_put_failure;
3079                 if (expr->ops->dump(skb, expr, reset) < 0)
3080                         goto nla_put_failure;
3081                 nla_nest_end(skb, data);
3082         }
3083
3084         return skb->len;
3085
3086 nla_put_failure:
3087         return -1;
3088 };
3089
3090 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3091                   const struct nft_expr *expr, bool reset)
3092 {
3093         struct nlattr *nest;
3094
3095         nest = nla_nest_start_noflag(skb, attr);
3096         if (!nest)
3097                 goto nla_put_failure;
3098         if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3099                 goto nla_put_failure;
3100         nla_nest_end(skb, nest);
3101         return 0;
3102
3103 nla_put_failure:
3104         return -1;
3105 }
3106
3107 struct nft_expr_info {
3108         const struct nft_expr_ops       *ops;
3109         const struct nlattr             *attr;
3110         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
3111 };
3112
3113 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3114                                 const struct nlattr *nla,
3115                                 struct nft_expr_info *info)
3116 {
3117         const struct nft_expr_type *type;
3118         const struct nft_expr_ops *ops;
3119         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3120         int err;
3121
3122         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3123                                           nft_expr_policy, NULL);
3124         if (err < 0)
3125                 return err;
3126
3127         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3128         if (IS_ERR(type))
3129                 return PTR_ERR(type);
3130
3131         if (tb[NFTA_EXPR_DATA]) {
3132                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3133                                                   tb[NFTA_EXPR_DATA],
3134                                                   type->policy, NULL);
3135                 if (err < 0)
3136                         goto err1;
3137         } else
3138                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3139
3140         if (type->select_ops != NULL) {
3141                 ops = type->select_ops(ctx,
3142                                        (const struct nlattr * const *)info->tb);
3143                 if (IS_ERR(ops)) {
3144                         err = PTR_ERR(ops);
3145 #ifdef CONFIG_MODULES
3146                         if (err == -EAGAIN)
3147                                 if (nft_expr_type_request_module(ctx->net,
3148                                                                  ctx->family,
3149                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
3150                                         err = -ENOENT;
3151 #endif
3152                         goto err1;
3153                 }
3154         } else
3155                 ops = type->ops;
3156
3157         info->attr = nla;
3158         info->ops = ops;
3159
3160         return 0;
3161
3162 err1:
3163         module_put(type->owner);
3164         return err;
3165 }
3166
3167 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3168                          struct nft_expr_info *info)
3169 {
3170         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3171         const struct nft_expr_type *type;
3172         int err;
3173
3174         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3175                                           nft_expr_policy, NULL);
3176         if (err < 0)
3177                 return err;
3178
3179         if (!tb[NFTA_EXPR_DATA] || !tb[NFTA_EXPR_NAME])
3180                 return -EINVAL;
3181
3182         type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3183         if (!type)
3184                 return -ENOENT;
3185
3186         if (!type->inner_ops)
3187                 return -EOPNOTSUPP;
3188
3189         err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3190                                           tb[NFTA_EXPR_DATA],
3191                                           type->policy, NULL);
3192         if (err < 0)
3193                 goto err_nla_parse;
3194
3195         info->attr = nla;
3196         info->ops = type->inner_ops;
3197
3198         return 0;
3199
3200 err_nla_parse:
3201         return err;
3202 }
3203
3204 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3205                              const struct nft_expr_info *expr_info,
3206                              struct nft_expr *expr)
3207 {
3208         const struct nft_expr_ops *ops = expr_info->ops;
3209         int err;
3210
3211         expr->ops = ops;
3212         if (ops->init) {
3213                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3214                 if (err < 0)
3215                         goto err1;
3216         }
3217
3218         return 0;
3219 err1:
3220         expr->ops = NULL;
3221         return err;
3222 }
3223
3224 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3225                                    struct nft_expr *expr)
3226 {
3227         const struct nft_expr_type *type = expr->ops->type;
3228
3229         if (expr->ops->destroy)
3230                 expr->ops->destroy(ctx, expr);
3231         module_put(type->owner);
3232 }
3233
3234 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3235                                       const struct nlattr *nla)
3236 {
3237         struct nft_expr_info expr_info;
3238         struct nft_expr *expr;
3239         struct module *owner;
3240         int err;
3241
3242         err = nf_tables_expr_parse(ctx, nla, &expr_info);
3243         if (err < 0)
3244                 goto err_expr_parse;
3245
3246         err = -EOPNOTSUPP;
3247         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3248                 goto err_expr_stateful;
3249
3250         err = -ENOMEM;
3251         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3252         if (expr == NULL)
3253                 goto err_expr_stateful;
3254
3255         err = nf_tables_newexpr(ctx, &expr_info, expr);
3256         if (err < 0)
3257                 goto err_expr_new;
3258
3259         return expr;
3260 err_expr_new:
3261         kfree(expr);
3262 err_expr_stateful:
3263         owner = expr_info.ops->type->owner;
3264         if (expr_info.ops->type->release_ops)
3265                 expr_info.ops->type->release_ops(expr_info.ops);
3266
3267         module_put(owner);
3268 err_expr_parse:
3269         return ERR_PTR(err);
3270 }
3271
3272 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3273 {
3274         int err;
3275
3276         if (src->ops->clone) {
3277                 dst->ops = src->ops;
3278                 err = src->ops->clone(dst, src);
3279                 if (err < 0)
3280                         return err;
3281         } else {
3282                 memcpy(dst, src, src->ops->size);
3283         }
3284
3285         __module_get(src->ops->type->owner);
3286
3287         return 0;
3288 }
3289
3290 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3291 {
3292         nf_tables_expr_destroy(ctx, expr);
3293         kfree(expr);
3294 }
3295
3296 /*
3297  * Rules
3298  */
3299
3300 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3301                                           u64 handle)
3302 {
3303         struct nft_rule *rule;
3304
3305         // FIXME: this sucks
3306         list_for_each_entry_rcu(rule, &chain->rules, list) {
3307                 if (handle == rule->handle)
3308                         return rule;
3309         }
3310
3311         return ERR_PTR(-ENOENT);
3312 }
3313
3314 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3315                                         const struct nlattr *nla)
3316 {
3317         if (nla == NULL)
3318                 return ERR_PTR(-EINVAL);
3319
3320         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3321 }
3322
3323 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3324         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
3325                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
3326         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
3327                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
3328         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
3329         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3330         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
3331         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
3332         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
3333                                     .len = NFT_USERDATA_MAXLEN },
3334         [NFTA_RULE_ID]          = { .type = NLA_U32 },
3335         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3336         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
3337 };
3338
3339 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3340                                     u32 portid, u32 seq, int event,
3341                                     u32 flags, int family,
3342                                     const struct nft_table *table,
3343                                     const struct nft_chain *chain,
3344                                     const struct nft_rule *rule, u64 handle,
3345                                     bool reset)
3346 {
3347         struct nlmsghdr *nlh;
3348         const struct nft_expr *expr, *next;
3349         struct nlattr *list;
3350         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3351
3352         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3353                            nft_base_seq(net));
3354         if (!nlh)
3355                 goto nla_put_failure;
3356
3357         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3358                 goto nla_put_failure;
3359         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3360                 goto nla_put_failure;
3361         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3362                          NFTA_RULE_PAD))
3363                 goto nla_put_failure;
3364
3365         if (event != NFT_MSG_DELRULE && handle) {
3366                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3367                                  NFTA_RULE_PAD))
3368                         goto nla_put_failure;
3369         }
3370
3371         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3372                 nft_flow_rule_stats(chain, rule);
3373
3374         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3375         if (list == NULL)
3376                 goto nla_put_failure;
3377         nft_rule_for_each_expr(expr, next, rule) {
3378                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3379                         goto nla_put_failure;
3380         }
3381         nla_nest_end(skb, list);
3382
3383         if (rule->udata) {
3384                 struct nft_userdata *udata = nft_userdata(rule);
3385                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3386                             udata->data) < 0)
3387                         goto nla_put_failure;
3388         }
3389
3390         nlmsg_end(skb, nlh);
3391         return 0;
3392
3393 nla_put_failure:
3394         nlmsg_trim(skb, nlh);
3395         return -1;
3396 }
3397
3398 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3399                                   const struct nft_rule *rule, int event)
3400 {
3401         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3402         const struct nft_rule *prule;
3403         struct sk_buff *skb;
3404         u64 handle = 0;
3405         u16 flags = 0;
3406         int err;
3407
3408         if (!ctx->report &&
3409             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3410                 return;
3411
3412         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3413         if (skb == NULL)
3414                 goto err;
3415
3416         if (event == NFT_MSG_NEWRULE &&
3417             !list_is_first(&rule->list, &ctx->chain->rules) &&
3418             !list_is_last(&rule->list, &ctx->chain->rules)) {
3419                 prule = list_prev_entry(rule, list);
3420                 handle = prule->handle;
3421         }
3422         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3423                 flags |= NLM_F_APPEND;
3424         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3425                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3426
3427         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3428                                        event, flags, ctx->family, ctx->table,
3429                                        ctx->chain, rule, handle, false);
3430         if (err < 0) {
3431                 kfree_skb(skb);
3432                 goto err;
3433         }
3434
3435         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3436         return;
3437 err:
3438         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3439 }
3440
3441 static void audit_log_rule_reset(const struct nft_table *table,
3442                                  unsigned int base_seq,
3443                                  unsigned int nentries)
3444 {
3445         char *buf = kasprintf(GFP_ATOMIC, "%s:%u",
3446                               table->name, base_seq);
3447
3448         audit_log_nfcfg(buf, table->family, nentries,
3449                         AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3450         kfree(buf);
3451 }
3452
3453 struct nft_rule_dump_ctx {
3454         char *table;
3455         char *chain;
3456 };
3457
3458 static int __nf_tables_dump_rules(struct sk_buff *skb,
3459                                   unsigned int *idx,
3460                                   struct netlink_callback *cb,
3461                                   const struct nft_table *table,
3462                                   const struct nft_chain *chain,
3463                                   bool reset)
3464 {
3465         struct net *net = sock_net(skb->sk);
3466         const struct nft_rule *rule, *prule;
3467         unsigned int s_idx = cb->args[0];
3468         unsigned int entries = 0;
3469         int ret = 0;
3470         u64 handle;
3471
3472         prule = NULL;
3473         list_for_each_entry_rcu(rule, &chain->rules, list) {
3474                 if (!nft_is_active(net, rule))
3475                         goto cont_skip;
3476                 if (*idx < s_idx)
3477                         goto cont;
3478                 if (prule)
3479                         handle = prule->handle;
3480                 else
3481                         handle = 0;
3482
3483                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3484                                         cb->nlh->nlmsg_seq,
3485                                         NFT_MSG_NEWRULE,
3486                                         NLM_F_MULTI | NLM_F_APPEND,
3487                                         table->family,
3488                                         table, chain, rule, handle, reset) < 0) {
3489                         ret = 1;
3490                         break;
3491                 }
3492                 entries++;
3493                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3494 cont:
3495                 prule = rule;
3496 cont_skip:
3497                 (*idx)++;
3498         }
3499
3500         if (reset && entries)
3501                 audit_log_rule_reset(table, cb->seq, entries);
3502
3503         return ret;
3504 }
3505
3506 static int nf_tables_dump_rules(struct sk_buff *skb,
3507                                 struct netlink_callback *cb)
3508 {
3509         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3510         const struct nft_rule_dump_ctx *ctx = cb->data;
3511         struct nft_table *table;
3512         const struct nft_chain *chain;
3513         unsigned int idx = 0;
3514         struct net *net = sock_net(skb->sk);
3515         int family = nfmsg->nfgen_family;
3516         struct nftables_pernet *nft_net;
3517         bool reset = false;
3518
3519         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3520                 reset = true;
3521
3522         rcu_read_lock();
3523         nft_net = nft_pernet(net);
3524         cb->seq = READ_ONCE(nft_net->base_seq);
3525
3526         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3527                 if (family != NFPROTO_UNSPEC && family != table->family)
3528                         continue;
3529
3530                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3531                         continue;
3532
3533                 if (ctx && ctx->table && ctx->chain) {
3534                         struct rhlist_head *list, *tmp;
3535
3536                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3537                                                nft_chain_ht_params);
3538                         if (!list)
3539                                 goto done;
3540
3541                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3542                                 if (!nft_is_active(net, chain))
3543                                         continue;
3544                                 __nf_tables_dump_rules(skb, &idx,
3545                                                        cb, table, chain, reset);
3546                                 break;
3547                         }
3548                         goto done;
3549                 }
3550
3551                 list_for_each_entry_rcu(chain, &table->chains, list) {
3552                         if (__nf_tables_dump_rules(skb, &idx,
3553                                                    cb, table, chain, reset))
3554                                 goto done;
3555                 }
3556
3557                 if (ctx && ctx->table)
3558                         break;
3559         }
3560 done:
3561         rcu_read_unlock();
3562
3563         cb->args[0] = idx;
3564         return skb->len;
3565 }
3566
3567 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3568 {
3569         const struct nlattr * const *nla = cb->data;
3570         struct nft_rule_dump_ctx *ctx = NULL;
3571
3572         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3573                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3574                 if (!ctx)
3575                         return -ENOMEM;
3576
3577                 if (nla[NFTA_RULE_TABLE]) {
3578                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3579                                                         GFP_ATOMIC);
3580                         if (!ctx->table) {
3581                                 kfree(ctx);
3582                                 return -ENOMEM;
3583                         }
3584                 }
3585                 if (nla[NFTA_RULE_CHAIN]) {
3586                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3587                                                 GFP_ATOMIC);
3588                         if (!ctx->chain) {
3589                                 kfree(ctx->table);
3590                                 kfree(ctx);
3591                                 return -ENOMEM;
3592                         }
3593                 }
3594         }
3595
3596         cb->data = ctx;
3597         return 0;
3598 }
3599
3600 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3601 {
3602         struct nft_rule_dump_ctx *ctx = cb->data;
3603
3604         if (ctx) {
3605                 kfree(ctx->table);
3606                 kfree(ctx->chain);
3607                 kfree(ctx);
3608         }
3609         return 0;
3610 }
3611
3612 /* called with rcu_read_lock held */
3613 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3614                              const struct nlattr * const nla[])
3615 {
3616         struct netlink_ext_ack *extack = info->extack;
3617         u8 genmask = nft_genmask_cur(info->net);
3618         u8 family = info->nfmsg->nfgen_family;
3619         const struct nft_chain *chain;
3620         const struct nft_rule *rule;
3621         struct net *net = info->net;
3622         struct nft_table *table;
3623         struct sk_buff *skb2;
3624         bool reset = false;
3625         int err;
3626
3627         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3628                 struct netlink_dump_control c = {
3629                         .start= nf_tables_dump_rules_start,
3630                         .dump = nf_tables_dump_rules,
3631                         .done = nf_tables_dump_rules_done,
3632                         .module = THIS_MODULE,
3633                         .data = (void *)nla,
3634                 };
3635
3636                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3637         }
3638
3639         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3640         if (IS_ERR(table)) {
3641                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3642                 return PTR_ERR(table);
3643         }
3644
3645         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3646         if (IS_ERR(chain)) {
3647                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3648                 return PTR_ERR(chain);
3649         }
3650
3651         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3652         if (IS_ERR(rule)) {
3653                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3654                 return PTR_ERR(rule);
3655         }
3656
3657         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3658         if (!skb2)
3659                 return -ENOMEM;
3660
3661         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3662                 reset = true;
3663
3664         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3665                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3666                                        family, table, chain, rule, 0, reset);
3667         if (err < 0)
3668                 goto err_fill_rule_info;
3669
3670         if (reset)
3671                 audit_log_rule_reset(table, nft_pernet(net)->base_seq, 1);
3672
3673         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3674
3675 err_fill_rule_info:
3676         kfree_skb(skb2);
3677         return err;
3678 }
3679
3680 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3681 {
3682         struct nft_expr *expr, *next;
3683
3684         /*
3685          * Careful: some expressions might not be initialized in case this
3686          * is called on error from nf_tables_newrule().
3687          */
3688         expr = nft_expr_first(rule);
3689         while (nft_expr_more(rule, expr)) {
3690                 next = nft_expr_next(expr);
3691                 nf_tables_expr_destroy(ctx, expr);
3692                 expr = next;
3693         }
3694         kfree(rule);
3695 }
3696
3697 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3698 {
3699         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3700         nf_tables_rule_destroy(ctx, rule);
3701 }
3702
3703 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3704 {
3705         struct nft_expr *expr, *last;
3706         const struct nft_data *data;
3707         struct nft_rule *rule;
3708         int err;
3709
3710         if (ctx->level == NFT_JUMP_STACK_SIZE)
3711                 return -EMLINK;
3712
3713         list_for_each_entry(rule, &chain->rules, list) {
3714                 if (fatal_signal_pending(current))
3715                         return -EINTR;
3716
3717                 if (!nft_is_active_next(ctx->net, rule))
3718                         continue;
3719
3720                 nft_rule_for_each_expr(expr, last, rule) {
3721                         if (!expr->ops->validate)
3722                                 continue;
3723
3724                         err = expr->ops->validate(ctx, expr, &data);
3725                         if (err < 0)
3726                                 return err;
3727                 }
3728         }
3729
3730         return 0;
3731 }
3732 EXPORT_SYMBOL_GPL(nft_chain_validate);
3733
3734 static int nft_table_validate(struct net *net, const struct nft_table *table)
3735 {
3736         struct nft_chain *chain;
3737         struct nft_ctx ctx = {
3738                 .net    = net,
3739                 .family = table->family,
3740         };
3741         int err;
3742
3743         list_for_each_entry(chain, &table->chains, list) {
3744                 if (!nft_is_base_chain(chain))
3745                         continue;
3746
3747                 ctx.chain = chain;
3748                 err = nft_chain_validate(&ctx, chain);
3749                 if (err < 0)
3750                         return err;
3751
3752                 cond_resched();
3753         }
3754
3755         return 0;
3756 }
3757
3758 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3759                          const struct nft_set_iter *iter,
3760                          struct nft_set_elem *elem)
3761 {
3762         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3763         struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3764         const struct nft_data *data;
3765         int err;
3766
3767         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3768             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3769                 return 0;
3770
3771         data = nft_set_ext_data(ext);
3772         switch (data->verdict.code) {
3773         case NFT_JUMP:
3774         case NFT_GOTO:
3775                 pctx->level++;
3776                 err = nft_chain_validate(ctx, data->verdict.chain);
3777                 if (err < 0)
3778                         return err;
3779                 pctx->level--;
3780                 break;
3781         default:
3782                 break;
3783         }
3784
3785         return 0;
3786 }
3787
3788 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3789 {
3790         u8 genmask = nft_genmask_next(ctx->net);
3791         struct nft_set_elem_catchall *catchall;
3792         struct nft_set_elem elem;
3793         struct nft_set_ext *ext;
3794         int ret = 0;
3795
3796         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3797                 ext = nft_set_elem_ext(set, catchall->elem);
3798                 if (!nft_set_elem_active(ext, genmask))
3799                         continue;
3800
3801                 elem.priv = catchall->elem;
3802                 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3803                 if (ret < 0)
3804                         return ret;
3805         }
3806
3807         return ret;
3808 }
3809
3810 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3811                                              const struct nft_chain *chain,
3812                                              const struct nlattr *nla);
3813
3814 #define NFT_RULE_MAXEXPRS       128
3815
3816 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3817                              const struct nlattr * const nla[])
3818 {
3819         struct nftables_pernet *nft_net = nft_pernet(info->net);
3820         struct netlink_ext_ack *extack = info->extack;
3821         unsigned int size, i, n, ulen = 0, usize = 0;
3822         u8 genmask = nft_genmask_next(info->net);
3823         struct nft_rule *rule, *old_rule = NULL;
3824         struct nft_expr_info *expr_info = NULL;
3825         u8 family = info->nfmsg->nfgen_family;
3826         struct nft_flow_rule *flow = NULL;
3827         struct net *net = info->net;
3828         struct nft_userdata *udata;
3829         struct nft_table *table;
3830         struct nft_chain *chain;
3831         struct nft_trans *trans;
3832         u64 handle, pos_handle;
3833         struct nft_expr *expr;
3834         struct nft_ctx ctx;
3835         struct nlattr *tmp;
3836         int err, rem;
3837
3838         lockdep_assert_held(&nft_net->commit_mutex);
3839
3840         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3841                                  NETLINK_CB(skb).portid);
3842         if (IS_ERR(table)) {
3843                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3844                 return PTR_ERR(table);
3845         }
3846
3847         if (nla[NFTA_RULE_CHAIN]) {
3848                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3849                                          genmask);
3850                 if (IS_ERR(chain)) {
3851                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3852                         return PTR_ERR(chain);
3853                 }
3854
3855         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3856                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3857                                               genmask);
3858                 if (IS_ERR(chain)) {
3859                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3860                         return PTR_ERR(chain);
3861                 }
3862         } else {
3863                 return -EINVAL;
3864         }
3865
3866         if (nft_chain_is_bound(chain))
3867                 return -EOPNOTSUPP;
3868
3869         if (nla[NFTA_RULE_HANDLE]) {
3870                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3871                 rule = __nft_rule_lookup(chain, handle);
3872                 if (IS_ERR(rule)) {
3873                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3874                         return PTR_ERR(rule);
3875                 }
3876
3877                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3878                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3879                         return -EEXIST;
3880                 }
3881                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3882                         old_rule = rule;
3883                 else
3884                         return -EOPNOTSUPP;
3885         } else {
3886                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3887                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3888                         return -EINVAL;
3889                 handle = nf_tables_alloc_handle(table);
3890
3891                 if (nla[NFTA_RULE_POSITION]) {
3892                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3893                         old_rule = __nft_rule_lookup(chain, pos_handle);
3894                         if (IS_ERR(old_rule)) {
3895                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3896                                 return PTR_ERR(old_rule);
3897                         }
3898                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3899                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3900                         if (IS_ERR(old_rule)) {
3901                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3902                                 return PTR_ERR(old_rule);
3903                         }
3904                 }
3905         }
3906
3907         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3908
3909         n = 0;
3910         size = 0;
3911         if (nla[NFTA_RULE_EXPRESSIONS]) {
3912                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3913                                            sizeof(struct nft_expr_info),
3914                                            GFP_KERNEL);
3915                 if (!expr_info)
3916                         return -ENOMEM;
3917
3918                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3919                         err = -EINVAL;
3920                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3921                                 goto err_release_expr;
3922                         if (n == NFT_RULE_MAXEXPRS)
3923                                 goto err_release_expr;
3924                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3925                         if (err < 0) {
3926                                 NL_SET_BAD_ATTR(extack, tmp);
3927                                 goto err_release_expr;
3928                         }
3929                         size += expr_info[n].ops->size;
3930                         n++;
3931                 }
3932         }
3933         /* Check for overflow of dlen field */
3934         err = -EFBIG;
3935         if (size >= 1 << 12)
3936                 goto err_release_expr;
3937
3938         if (nla[NFTA_RULE_USERDATA]) {
3939                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3940                 if (ulen > 0)
3941                         usize = sizeof(struct nft_userdata) + ulen;
3942         }
3943
3944         err = -ENOMEM;
3945         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3946         if (rule == NULL)
3947                 goto err_release_expr;
3948
3949         nft_activate_next(net, rule);
3950
3951         rule->handle = handle;
3952         rule->dlen   = size;
3953         rule->udata  = ulen ? 1 : 0;
3954
3955         if (ulen) {
3956                 udata = nft_userdata(rule);
3957                 udata->len = ulen - 1;
3958                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3959         }
3960
3961         expr = nft_expr_first(rule);
3962         for (i = 0; i < n; i++) {
3963                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3964                 if (err < 0) {
3965                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3966                         goto err_release_rule;
3967                 }
3968
3969                 if (expr_info[i].ops->validate)
3970                         nft_validate_state_update(table, NFT_VALIDATE_NEED);
3971
3972                 expr_info[i].ops = NULL;
3973                 expr = nft_expr_next(expr);
3974         }
3975
3976         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3977                 flow = nft_flow_rule_create(net, rule);
3978                 if (IS_ERR(flow)) {
3979                         err = PTR_ERR(flow);
3980                         goto err_release_rule;
3981                 }
3982         }
3983
3984         if (!nft_use_inc(&chain->use)) {
3985                 err = -EMFILE;
3986                 goto err_release_rule;
3987         }
3988
3989         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3990                 if (nft_chain_binding(chain)) {
3991                         err = -EOPNOTSUPP;
3992                         goto err_destroy_flow_rule;
3993                 }
3994
3995                 err = nft_delrule(&ctx, old_rule);
3996                 if (err < 0)
3997                         goto err_destroy_flow_rule;
3998
3999                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4000                 if (trans == NULL) {
4001                         err = -ENOMEM;
4002                         goto err_destroy_flow_rule;
4003                 }
4004                 list_add_tail_rcu(&rule->list, &old_rule->list);
4005         } else {
4006                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4007                 if (!trans) {
4008                         err = -ENOMEM;
4009                         goto err_destroy_flow_rule;
4010                 }
4011
4012                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
4013                         if (old_rule)
4014                                 list_add_rcu(&rule->list, &old_rule->list);
4015                         else
4016                                 list_add_tail_rcu(&rule->list, &chain->rules);
4017                  } else {
4018                         if (old_rule)
4019                                 list_add_tail_rcu(&rule->list, &old_rule->list);
4020                         else
4021                                 list_add_rcu(&rule->list, &chain->rules);
4022                 }
4023         }
4024         kvfree(expr_info);
4025
4026         if (flow)
4027                 nft_trans_flow_rule(trans) = flow;
4028
4029         if (table->validate_state == NFT_VALIDATE_DO)
4030                 return nft_table_validate(net, table);
4031
4032         return 0;
4033
4034 err_destroy_flow_rule:
4035         nft_use_dec_restore(&chain->use);
4036         if (flow)
4037                 nft_flow_rule_destroy(flow);
4038 err_release_rule:
4039         nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
4040         nf_tables_rule_destroy(&ctx, rule);
4041 err_release_expr:
4042         for (i = 0; i < n; i++) {
4043                 if (expr_info[i].ops) {
4044                         module_put(expr_info[i].ops->type->owner);
4045                         if (expr_info[i].ops->type->release_ops)
4046                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
4047                 }
4048         }
4049         kvfree(expr_info);
4050
4051         return err;
4052 }
4053
4054 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4055                                              const struct nft_chain *chain,
4056                                              const struct nlattr *nla)
4057 {
4058         struct nftables_pernet *nft_net = nft_pernet(net);
4059         u32 id = ntohl(nla_get_be32(nla));
4060         struct nft_trans *trans;
4061
4062         list_for_each_entry(trans, &nft_net->commit_list, list) {
4063                 if (trans->msg_type == NFT_MSG_NEWRULE &&
4064                     trans->ctx.chain == chain &&
4065                     id == nft_trans_rule_id(trans))
4066                         return nft_trans_rule(trans);
4067         }
4068         return ERR_PTR(-ENOENT);
4069 }
4070
4071 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4072                              const struct nlattr * const nla[])
4073 {
4074         struct netlink_ext_ack *extack = info->extack;
4075         u8 genmask = nft_genmask_next(info->net);
4076         u8 family = info->nfmsg->nfgen_family;
4077         struct nft_chain *chain = NULL;
4078         struct net *net = info->net;
4079         struct nft_table *table;
4080         struct nft_rule *rule;
4081         struct nft_ctx ctx;
4082         int err = 0;
4083
4084         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4085                                  NETLINK_CB(skb).portid);
4086         if (IS_ERR(table)) {
4087                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4088                 return PTR_ERR(table);
4089         }
4090
4091         if (nla[NFTA_RULE_CHAIN]) {
4092                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4093                                          genmask);
4094                 if (IS_ERR(chain)) {
4095                         if (PTR_ERR(chain) == -ENOENT &&
4096                             NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4097                                 return 0;
4098
4099                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4100                         return PTR_ERR(chain);
4101                 }
4102                 if (nft_chain_binding(chain))
4103                         return -EOPNOTSUPP;
4104         }
4105
4106         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4107
4108         if (chain) {
4109                 if (nla[NFTA_RULE_HANDLE]) {
4110                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4111                         if (IS_ERR(rule)) {
4112                                 if (PTR_ERR(rule) == -ENOENT &&
4113                                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4114                                         return 0;
4115
4116                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4117                                 return PTR_ERR(rule);
4118                         }
4119
4120                         err = nft_delrule(&ctx, rule);
4121                 } else if (nla[NFTA_RULE_ID]) {
4122                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4123                         if (IS_ERR(rule)) {
4124                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4125                                 return PTR_ERR(rule);
4126                         }
4127
4128                         err = nft_delrule(&ctx, rule);
4129                 } else {
4130                         err = nft_delrule_by_chain(&ctx);
4131                 }
4132         } else {
4133                 list_for_each_entry(chain, &table->chains, list) {
4134                         if (!nft_is_active_next(net, chain))
4135                                 continue;
4136                         if (nft_chain_binding(chain))
4137                                 continue;
4138
4139                         ctx.chain = chain;
4140                         err = nft_delrule_by_chain(&ctx);
4141                         if (err < 0)
4142                                 break;
4143                 }
4144         }
4145
4146         return err;
4147 }
4148
4149 /*
4150  * Sets
4151  */
4152 static const struct nft_set_type *nft_set_types[] = {
4153         &nft_set_hash_fast_type,
4154         &nft_set_hash_type,
4155         &nft_set_rhash_type,
4156         &nft_set_bitmap_type,
4157         &nft_set_rbtree_type,
4158 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4159         &nft_set_pipapo_avx2_type,
4160 #endif
4161         &nft_set_pipapo_type,
4162 };
4163
4164 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
4165                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4166                                  NFT_SET_EVAL)
4167
4168 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4169 {
4170         return (flags & type->features) == (flags & NFT_SET_FEATURES);
4171 }
4172
4173 /*
4174  * Select a set implementation based on the data characteristics and the
4175  * given policy. The total memory use might not be known if no size is
4176  * given, in that case the amount of memory per element is used.
4177  */
4178 static const struct nft_set_ops *
4179 nft_select_set_ops(const struct nft_ctx *ctx,
4180                    const struct nlattr * const nla[],
4181                    const struct nft_set_desc *desc)
4182 {
4183         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4184         const struct nft_set_ops *ops, *bops;
4185         struct nft_set_estimate est, best;
4186         const struct nft_set_type *type;
4187         u32 flags = 0;
4188         int i;
4189
4190         lockdep_assert_held(&nft_net->commit_mutex);
4191         lockdep_nfnl_nft_mutex_not_held();
4192
4193         if (nla[NFTA_SET_FLAGS] != NULL)
4194                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4195
4196         bops        = NULL;
4197         best.size   = ~0;
4198         best.lookup = ~0;
4199         best.space  = ~0;
4200
4201         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4202                 type = nft_set_types[i];
4203                 ops = &type->ops;
4204
4205                 if (!nft_set_ops_candidate(type, flags))
4206                         continue;
4207                 if (!ops->estimate(desc, flags, &est))
4208                         continue;
4209
4210                 switch (desc->policy) {
4211                 case NFT_SET_POL_PERFORMANCE:
4212                         if (est.lookup < best.lookup)
4213                                 break;
4214                         if (est.lookup == best.lookup &&
4215                             est.space < best.space)
4216                                 break;
4217                         continue;
4218                 case NFT_SET_POL_MEMORY:
4219                         if (!desc->size) {
4220                                 if (est.space < best.space)
4221                                         break;
4222                                 if (est.space == best.space &&
4223                                     est.lookup < best.lookup)
4224                                         break;
4225                         } else if (est.size < best.size || !bops) {
4226                                 break;
4227                         }
4228                         continue;
4229                 default:
4230                         break;
4231                 }
4232
4233                 bops = ops;
4234                 best = est;
4235         }
4236
4237         if (bops != NULL)
4238                 return bops;
4239
4240         return ERR_PTR(-EOPNOTSUPP);
4241 }
4242
4243 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4244         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
4245                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4246         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
4247                                             .len = NFT_SET_MAXNAMELEN - 1 },
4248         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
4249         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
4250         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
4251         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
4252         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
4253         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
4254         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
4255         [NFTA_SET_ID]                   = { .type = NLA_U32 },
4256         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
4257         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
4258         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
4259                                             .len  = NFT_USERDATA_MAXLEN },
4260         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
4261         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
4262         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
4263         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
4264 };
4265
4266 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4267         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
4268         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
4269 };
4270
4271 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4272                                       const struct nlattr *nla, u8 genmask)
4273 {
4274         struct nft_set *set;
4275
4276         if (nla == NULL)
4277                 return ERR_PTR(-EINVAL);
4278
4279         list_for_each_entry_rcu(set, &table->sets, list) {
4280                 if (!nla_strcmp(nla, set->name) &&
4281                     nft_active_genmask(set, genmask))
4282                         return set;
4283         }
4284         return ERR_PTR(-ENOENT);
4285 }
4286
4287 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4288                                                const struct nlattr *nla,
4289                                                u8 genmask)
4290 {
4291         struct nft_set *set;
4292
4293         list_for_each_entry(set, &table->sets, list) {
4294                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4295                     nft_active_genmask(set, genmask))
4296                         return set;
4297         }
4298         return ERR_PTR(-ENOENT);
4299 }
4300
4301 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4302                                            const struct nft_table *table,
4303                                            const struct nlattr *nla, u8 genmask)
4304 {
4305         struct nftables_pernet *nft_net = nft_pernet(net);
4306         u32 id = ntohl(nla_get_be32(nla));
4307         struct nft_trans *trans;
4308
4309         list_for_each_entry(trans, &nft_net->commit_list, list) {
4310                 if (trans->msg_type == NFT_MSG_NEWSET) {
4311                         struct nft_set *set = nft_trans_set(trans);
4312
4313                         if (id == nft_trans_set_id(trans) &&
4314                             set->table == table &&
4315                             nft_active_genmask(set, genmask))
4316                                 return set;
4317                 }
4318         }
4319         return ERR_PTR(-ENOENT);
4320 }
4321
4322 struct nft_set *nft_set_lookup_global(const struct net *net,
4323                                       const struct nft_table *table,
4324                                       const struct nlattr *nla_set_name,
4325                                       const struct nlattr *nla_set_id,
4326                                       u8 genmask)
4327 {
4328         struct nft_set *set;
4329
4330         set = nft_set_lookup(table, nla_set_name, genmask);
4331         if (IS_ERR(set)) {
4332                 if (!nla_set_id)
4333                         return set;
4334
4335                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4336         }
4337         return set;
4338 }
4339 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4340
4341 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4342                                     const char *name)
4343 {
4344         const struct nft_set *i;
4345         const char *p;
4346         unsigned long *inuse;
4347         unsigned int n = 0, min = 0;
4348
4349         p = strchr(name, '%');
4350         if (p != NULL) {
4351                 if (p[1] != 'd' || strchr(p + 2, '%'))
4352                         return -EINVAL;
4353
4354                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4355                 if (inuse == NULL)
4356                         return -ENOMEM;
4357 cont:
4358                 list_for_each_entry(i, &ctx->table->sets, list) {
4359                         int tmp;
4360
4361                         if (!nft_is_active_next(ctx->net, i))
4362                                 continue;
4363                         if (!sscanf(i->name, name, &tmp))
4364                                 continue;
4365                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4366                                 continue;
4367
4368                         set_bit(tmp - min, inuse);
4369                 }
4370
4371                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4372                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4373                         min += BITS_PER_BYTE * PAGE_SIZE;
4374                         memset(inuse, 0, PAGE_SIZE);
4375                         goto cont;
4376                 }
4377                 free_page((unsigned long)inuse);
4378         }
4379
4380         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4381         if (!set->name)
4382                 return -ENOMEM;
4383
4384         list_for_each_entry(i, &ctx->table->sets, list) {
4385                 if (!nft_is_active_next(ctx->net, i))
4386                         continue;
4387                 if (!strcmp(set->name, i->name)) {
4388                         kfree(set->name);
4389                         set->name = NULL;
4390                         return -ENFILE;
4391                 }
4392         }
4393         return 0;
4394 }
4395
4396 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4397 {
4398         u64 ms = be64_to_cpu(nla_get_be64(nla));
4399         u64 max = (u64)(~((u64)0));
4400
4401         max = div_u64(max, NSEC_PER_MSEC);
4402         if (ms >= max)
4403                 return -ERANGE;
4404
4405         ms *= NSEC_PER_MSEC;
4406         *result = nsecs_to_jiffies64(ms);
4407         return 0;
4408 }
4409
4410 __be64 nf_jiffies64_to_msecs(u64 input)
4411 {
4412         return cpu_to_be64(jiffies64_to_msecs(input));
4413 }
4414
4415 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4416                                      const struct nft_set *set)
4417 {
4418         struct nlattr *concat, *field;
4419         int i;
4420
4421         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4422         if (!concat)
4423                 return -ENOMEM;
4424
4425         for (i = 0; i < set->field_count; i++) {
4426                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4427                 if (!field)
4428                         return -ENOMEM;
4429
4430                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4431                                  htonl(set->field_len[i])))
4432                         return -ENOMEM;
4433
4434                 nla_nest_end(skb, field);
4435         }
4436
4437         nla_nest_end(skb, concat);
4438
4439         return 0;
4440 }
4441
4442 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4443                               const struct nft_set *set, u16 event, u16 flags)
4444 {
4445         u64 timeout = READ_ONCE(set->timeout);
4446         u32 gc_int = READ_ONCE(set->gc_int);
4447         u32 portid = ctx->portid;
4448         struct nlmsghdr *nlh;
4449         struct nlattr *nest;
4450         u32 seq = ctx->seq;
4451         int i;
4452
4453         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4454         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4455                            NFNETLINK_V0, nft_base_seq(ctx->net));
4456         if (!nlh)
4457                 goto nla_put_failure;
4458
4459         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4460                 goto nla_put_failure;
4461         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4462                 goto nla_put_failure;
4463         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4464                          NFTA_SET_PAD))
4465                 goto nla_put_failure;
4466
4467         if (event == NFT_MSG_DELSET) {
4468                 nlmsg_end(skb, nlh);
4469                 return 0;
4470         }
4471
4472         if (set->flags != 0)
4473                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4474                         goto nla_put_failure;
4475
4476         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4477                 goto nla_put_failure;
4478         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4479                 goto nla_put_failure;
4480         if (set->flags & NFT_SET_MAP) {
4481                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4482                         goto nla_put_failure;
4483                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4484                         goto nla_put_failure;
4485         }
4486         if (set->flags & NFT_SET_OBJECT &&
4487             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4488                 goto nla_put_failure;
4489
4490         if (timeout &&
4491             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4492                          nf_jiffies64_to_msecs(timeout),
4493                          NFTA_SET_PAD))
4494                 goto nla_put_failure;
4495         if (gc_int &&
4496             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4497                 goto nla_put_failure;
4498
4499         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4500                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4501                         goto nla_put_failure;
4502         }
4503
4504         if (set->udata &&
4505             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4506                 goto nla_put_failure;
4507
4508         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4509         if (!nest)
4510                 goto nla_put_failure;
4511         if (set->size &&
4512             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4513                 goto nla_put_failure;
4514
4515         if (set->field_count > 1 &&
4516             nf_tables_fill_set_concat(skb, set))
4517                 goto nla_put_failure;
4518
4519         nla_nest_end(skb, nest);
4520
4521         if (set->num_exprs == 1) {
4522                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4523                 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4524                         goto nla_put_failure;
4525
4526                 nla_nest_end(skb, nest);
4527         } else if (set->num_exprs > 1) {
4528                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4529                 if (nest == NULL)
4530                         goto nla_put_failure;
4531
4532                 for (i = 0; i < set->num_exprs; i++) {
4533                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4534                                           set->exprs[i], false) < 0)
4535                                 goto nla_put_failure;
4536                 }
4537                 nla_nest_end(skb, nest);
4538         }
4539
4540         nlmsg_end(skb, nlh);
4541         return 0;
4542
4543 nla_put_failure:
4544         nlmsg_trim(skb, nlh);
4545         return -1;
4546 }
4547
4548 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4549                                  const struct nft_set *set, int event,
4550                                  gfp_t gfp_flags)
4551 {
4552         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4553         u32 portid = ctx->portid;
4554         struct sk_buff *skb;
4555         u16 flags = 0;
4556         int err;
4557
4558         if (!ctx->report &&
4559             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4560                 return;
4561
4562         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4563         if (skb == NULL)
4564                 goto err;
4565
4566         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4567                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4568
4569         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4570         if (err < 0) {
4571                 kfree_skb(skb);
4572                 goto err;
4573         }
4574
4575         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4576         return;
4577 err:
4578         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4579 }
4580
4581 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4582 {
4583         const struct nft_set *set;
4584         unsigned int idx, s_idx = cb->args[0];
4585         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4586         struct net *net = sock_net(skb->sk);
4587         struct nft_ctx *ctx = cb->data, ctx_set;
4588         struct nftables_pernet *nft_net;
4589
4590         if (cb->args[1])
4591                 return skb->len;
4592
4593         rcu_read_lock();
4594         nft_net = nft_pernet(net);
4595         cb->seq = READ_ONCE(nft_net->base_seq);
4596
4597         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4598                 if (ctx->family != NFPROTO_UNSPEC &&
4599                     ctx->family != table->family)
4600                         continue;
4601
4602                 if (ctx->table && ctx->table != table)
4603                         continue;
4604
4605                 if (cur_table) {
4606                         if (cur_table != table)
4607                                 continue;
4608
4609                         cur_table = NULL;
4610                 }
4611                 idx = 0;
4612                 list_for_each_entry_rcu(set, &table->sets, list) {
4613                         if (idx < s_idx)
4614                                 goto cont;
4615                         if (!nft_is_active(net, set))
4616                                 goto cont;
4617
4618                         ctx_set = *ctx;
4619                         ctx_set.table = table;
4620                         ctx_set.family = table->family;
4621
4622                         if (nf_tables_fill_set(skb, &ctx_set, set,
4623                                                NFT_MSG_NEWSET,
4624                                                NLM_F_MULTI) < 0) {
4625                                 cb->args[0] = idx;
4626                                 cb->args[2] = (unsigned long) table;
4627                                 goto done;
4628                         }
4629                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4630 cont:
4631                         idx++;
4632                 }
4633                 if (s_idx)
4634                         s_idx = 0;
4635         }
4636         cb->args[1] = 1;
4637 done:
4638         rcu_read_unlock();
4639         return skb->len;
4640 }
4641
4642 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4643 {
4644         struct nft_ctx *ctx_dump = NULL;
4645
4646         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4647         if (ctx_dump == NULL)
4648                 return -ENOMEM;
4649
4650         cb->data = ctx_dump;
4651         return 0;
4652 }
4653
4654 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4655 {
4656         kfree(cb->data);
4657         return 0;
4658 }
4659
4660 /* called with rcu_read_lock held */
4661 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4662                             const struct nlattr * const nla[])
4663 {
4664         struct netlink_ext_ack *extack = info->extack;
4665         u8 genmask = nft_genmask_cur(info->net);
4666         u8 family = info->nfmsg->nfgen_family;
4667         struct nft_table *table = NULL;
4668         struct net *net = info->net;
4669         const struct nft_set *set;
4670         struct sk_buff *skb2;
4671         struct nft_ctx ctx;
4672         int err;
4673
4674         if (nla[NFTA_SET_TABLE]) {
4675                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4676                                          genmask, 0);
4677                 if (IS_ERR(table)) {
4678                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4679                         return PTR_ERR(table);
4680                 }
4681         }
4682
4683         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4684
4685         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4686                 struct netlink_dump_control c = {
4687                         .start = nf_tables_dump_sets_start,
4688                         .dump = nf_tables_dump_sets,
4689                         .done = nf_tables_dump_sets_done,
4690                         .data = &ctx,
4691                         .module = THIS_MODULE,
4692                 };
4693
4694                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4695         }
4696
4697         /* Only accept unspec with dump */
4698         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4699                 return -EAFNOSUPPORT;
4700         if (!nla[NFTA_SET_TABLE])
4701                 return -EINVAL;
4702
4703         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4704         if (IS_ERR(set))
4705                 return PTR_ERR(set);
4706
4707         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4708         if (skb2 == NULL)
4709                 return -ENOMEM;
4710
4711         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4712         if (err < 0)
4713                 goto err_fill_set_info;
4714
4715         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4716
4717 err_fill_set_info:
4718         kfree_skb(skb2);
4719         return err;
4720 }
4721
4722 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4723         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4724 };
4725
4726 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4727                                      struct nft_set_desc *desc)
4728 {
4729         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4730         u32 len;
4731         int err;
4732
4733         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4734                 return -E2BIG;
4735
4736         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4737                                           nft_concat_policy, NULL);
4738         if (err < 0)
4739                 return err;
4740
4741         if (!tb[NFTA_SET_FIELD_LEN])
4742                 return -EINVAL;
4743
4744         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4745         if (!len || len > U8_MAX)
4746                 return -EINVAL;
4747
4748         desc->field_len[desc->field_count++] = len;
4749
4750         return 0;
4751 }
4752
4753 static int nft_set_desc_concat(struct nft_set_desc *desc,
4754                                const struct nlattr *nla)
4755 {
4756         u32 num_regs = 0, key_num_regs = 0;
4757         struct nlattr *attr;
4758         int rem, err, i;
4759
4760         nla_for_each_nested(attr, nla, rem) {
4761                 if (nla_type(attr) != NFTA_LIST_ELEM)
4762                         return -EINVAL;
4763
4764                 err = nft_set_desc_concat_parse(attr, desc);
4765                 if (err < 0)
4766                         return err;
4767         }
4768
4769         for (i = 0; i < desc->field_count; i++)
4770                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4771
4772         key_num_regs = DIV_ROUND_UP(desc->klen, sizeof(u32));
4773         if (key_num_regs != num_regs)
4774                 return -EINVAL;
4775
4776         if (num_regs > NFT_REG32_COUNT)
4777                 return -E2BIG;
4778
4779         return 0;
4780 }
4781
4782 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4783                                     const struct nlattr *nla)
4784 {
4785         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4786         int err;
4787
4788         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4789                                           nft_set_desc_policy, NULL);
4790         if (err < 0)
4791                 return err;
4792
4793         if (da[NFTA_SET_DESC_SIZE] != NULL)
4794                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4795         if (da[NFTA_SET_DESC_CONCAT])
4796                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4797
4798         return err;
4799 }
4800
4801 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4802                               const struct nlattr * const *nla,
4803                               struct nft_expr **exprs, int *num_exprs,
4804                               u32 flags)
4805 {
4806         struct nft_expr *expr;
4807         int err, i;
4808
4809         if (nla[NFTA_SET_EXPR]) {
4810                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4811                 if (IS_ERR(expr)) {
4812                         err = PTR_ERR(expr);
4813                         goto err_set_expr_alloc;
4814                 }
4815                 exprs[0] = expr;
4816                 (*num_exprs)++;
4817         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4818                 struct nlattr *tmp;
4819                 int left;
4820
4821                 if (!(flags & NFT_SET_EXPR)) {
4822                         err = -EINVAL;
4823                         goto err_set_expr_alloc;
4824                 }
4825                 i = 0;
4826                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4827                         if (i == NFT_SET_EXPR_MAX) {
4828                                 err = -E2BIG;
4829                                 goto err_set_expr_alloc;
4830                         }
4831                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4832                                 err = -EINVAL;
4833                                 goto err_set_expr_alloc;
4834                         }
4835                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4836                         if (IS_ERR(expr)) {
4837                                 err = PTR_ERR(expr);
4838                                 goto err_set_expr_alloc;
4839                         }
4840                         exprs[i++] = expr;
4841                         (*num_exprs)++;
4842                 }
4843         }
4844
4845         return 0;
4846
4847 err_set_expr_alloc:
4848         for (i = 0; i < *num_exprs; i++)
4849                 nft_expr_destroy(ctx, exprs[i]);
4850
4851         return err;
4852 }
4853
4854 static bool nft_set_is_same(const struct nft_set *set,
4855                             const struct nft_set_desc *desc,
4856                             struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4857 {
4858         int i;
4859
4860         if (set->ktype != desc->ktype ||
4861             set->dtype != desc->dtype ||
4862             set->flags != flags ||
4863             set->klen != desc->klen ||
4864             set->dlen != desc->dlen ||
4865             set->field_count != desc->field_count ||
4866             set->num_exprs != num_exprs)
4867                 return false;
4868
4869         for (i = 0; i < desc->field_count; i++) {
4870                 if (set->field_len[i] != desc->field_len[i])
4871                         return false;
4872         }
4873
4874         for (i = 0; i < num_exprs; i++) {
4875                 if (set->exprs[i]->ops != exprs[i]->ops)
4876                         return false;
4877         }
4878
4879         return true;
4880 }
4881
4882 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4883                             const struct nlattr * const nla[])
4884 {
4885         struct netlink_ext_ack *extack = info->extack;
4886         u8 genmask = nft_genmask_next(info->net);
4887         u8 family = info->nfmsg->nfgen_family;
4888         const struct nft_set_ops *ops;
4889         struct net *net = info->net;
4890         struct nft_set_desc desc;
4891         struct nft_table *table;
4892         unsigned char *udata;
4893         struct nft_set *set;
4894         struct nft_ctx ctx;
4895         size_t alloc_size;
4896         int num_exprs = 0;
4897         char *name;
4898         int err, i;
4899         u16 udlen;
4900         u32 flags;
4901         u64 size;
4902
4903         if (nla[NFTA_SET_TABLE] == NULL ||
4904             nla[NFTA_SET_NAME] == NULL ||
4905             nla[NFTA_SET_KEY_LEN] == NULL ||
4906             nla[NFTA_SET_ID] == NULL)
4907                 return -EINVAL;
4908
4909         memset(&desc, 0, sizeof(desc));
4910
4911         desc.ktype = NFT_DATA_VALUE;
4912         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4913                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4914                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4915                         return -EINVAL;
4916         }
4917
4918         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4919         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4920                 return -EINVAL;
4921
4922         flags = 0;
4923         if (nla[NFTA_SET_FLAGS] != NULL) {
4924                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4925                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4926                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4927                               NFT_SET_MAP | NFT_SET_EVAL |
4928                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4929                         return -EOPNOTSUPP;
4930                 /* Only one of these operations is supported */
4931                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4932                              (NFT_SET_MAP | NFT_SET_OBJECT))
4933                         return -EOPNOTSUPP;
4934                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4935                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4936                         return -EOPNOTSUPP;
4937         }
4938
4939         desc.dtype = 0;
4940         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4941                 if (!(flags & NFT_SET_MAP))
4942                         return -EINVAL;
4943
4944                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4945                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4946                     desc.dtype != NFT_DATA_VERDICT)
4947                         return -EINVAL;
4948
4949                 if (desc.dtype != NFT_DATA_VERDICT) {
4950                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4951                                 return -EINVAL;
4952                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4953                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4954                                 return -EINVAL;
4955                 } else
4956                         desc.dlen = sizeof(struct nft_verdict);
4957         } else if (flags & NFT_SET_MAP)
4958                 return -EINVAL;
4959
4960         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4961                 if (!(flags & NFT_SET_OBJECT))
4962                         return -EINVAL;
4963
4964                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4965                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4966                     desc.objtype > NFT_OBJECT_MAX)
4967                         return -EOPNOTSUPP;
4968         } else if (flags & NFT_SET_OBJECT)
4969                 return -EINVAL;
4970         else
4971                 desc.objtype = NFT_OBJECT_UNSPEC;
4972
4973         desc.timeout = 0;
4974         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4975                 if (!(flags & NFT_SET_TIMEOUT))
4976                         return -EINVAL;
4977
4978                 if (flags & NFT_SET_ANONYMOUS)
4979                         return -EOPNOTSUPP;
4980
4981                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4982                 if (err)
4983                         return err;
4984         }
4985         desc.gc_int = 0;
4986         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4987                 if (!(flags & NFT_SET_TIMEOUT))
4988                         return -EINVAL;
4989
4990                 if (flags & NFT_SET_ANONYMOUS)
4991                         return -EOPNOTSUPP;
4992
4993                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4994         }
4995
4996         desc.policy = NFT_SET_POL_PERFORMANCE;
4997         if (nla[NFTA_SET_POLICY] != NULL) {
4998                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4999                 switch (desc.policy) {
5000                 case NFT_SET_POL_PERFORMANCE:
5001                 case NFT_SET_POL_MEMORY:
5002                         break;
5003                 default:
5004                         return -EOPNOTSUPP;
5005                 }
5006         }
5007
5008         if (nla[NFTA_SET_DESC] != NULL) {
5009                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
5010                 if (err < 0)
5011                         return err;
5012
5013                 if (desc.field_count > 1) {
5014                         if (!(flags & NFT_SET_CONCAT))
5015                                 return -EINVAL;
5016                 } else if (flags & NFT_SET_CONCAT) {
5017                         return -EINVAL;
5018                 }
5019         } else if (flags & NFT_SET_CONCAT) {
5020                 return -EINVAL;
5021         }
5022
5023         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
5024                 desc.expr = true;
5025
5026         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
5027                                  NETLINK_CB(skb).portid);
5028         if (IS_ERR(table)) {
5029                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5030                 return PTR_ERR(table);
5031         }
5032
5033         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5034
5035         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
5036         if (IS_ERR(set)) {
5037                 if (PTR_ERR(set) != -ENOENT) {
5038                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5039                         return PTR_ERR(set);
5040                 }
5041         } else {
5042                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
5043
5044                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
5045                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5046                         return -EEXIST;
5047                 }
5048                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
5049                         return -EOPNOTSUPP;
5050
5051                 if (nft_set_is_anonymous(set))
5052                         return -EOPNOTSUPP;
5053
5054                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
5055                 if (err < 0)
5056                         return err;
5057
5058                 err = 0;
5059                 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
5060                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5061                         err = -EEXIST;
5062                 }
5063
5064                 for (i = 0; i < num_exprs; i++)
5065                         nft_expr_destroy(&ctx, exprs[i]);
5066
5067                 if (err < 0)
5068                         return err;
5069
5070                 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5071         }
5072
5073         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5074                 return -ENOENT;
5075
5076         ops = nft_select_set_ops(&ctx, nla, &desc);
5077         if (IS_ERR(ops))
5078                 return PTR_ERR(ops);
5079
5080         udlen = 0;
5081         if (nla[NFTA_SET_USERDATA])
5082                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5083
5084         size = 0;
5085         if (ops->privsize != NULL)
5086                 size = ops->privsize(nla, &desc);
5087         alloc_size = sizeof(*set) + size + udlen;
5088         if (alloc_size < size || alloc_size > INT_MAX)
5089                 return -ENOMEM;
5090
5091         if (!nft_use_inc(&table->use))
5092                 return -EMFILE;
5093
5094         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5095         if (!set) {
5096                 err = -ENOMEM;
5097                 goto err_alloc;
5098         }
5099
5100         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5101         if (!name) {
5102                 err = -ENOMEM;
5103                 goto err_set_name;
5104         }
5105
5106         err = nf_tables_set_alloc_name(&ctx, set, name);
5107         kfree(name);
5108         if (err < 0)
5109                 goto err_set_name;
5110
5111         udata = NULL;
5112         if (udlen) {
5113                 udata = set->data + size;
5114                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5115         }
5116
5117         INIT_LIST_HEAD(&set->bindings);
5118         INIT_LIST_HEAD(&set->catchall_list);
5119         refcount_set(&set->refs, 1);
5120         set->table = table;
5121         write_pnet(&set->net, net);
5122         set->ops = ops;
5123         set->ktype = desc.ktype;
5124         set->klen = desc.klen;
5125         set->dtype = desc.dtype;
5126         set->objtype = desc.objtype;
5127         set->dlen = desc.dlen;
5128         set->flags = flags;
5129         set->size = desc.size;
5130         set->policy = desc.policy;
5131         set->udlen = udlen;
5132         set->udata = udata;
5133         set->timeout = desc.timeout;
5134         set->gc_int = desc.gc_int;
5135
5136         set->field_count = desc.field_count;
5137         for (i = 0; i < desc.field_count; i++)
5138                 set->field_len[i] = desc.field_len[i];
5139
5140         err = ops->init(set, &desc, nla);
5141         if (err < 0)
5142                 goto err_set_init;
5143
5144         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5145         if (err < 0)
5146                 goto err_set_destroy;
5147
5148         set->num_exprs = num_exprs;
5149         set->handle = nf_tables_alloc_handle(table);
5150         INIT_LIST_HEAD(&set->pending_update);
5151
5152         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5153         if (err < 0)
5154                 goto err_set_expr_alloc;
5155
5156         list_add_tail_rcu(&set->list, &table->sets);
5157
5158         return 0;
5159
5160 err_set_expr_alloc:
5161         for (i = 0; i < set->num_exprs; i++)
5162                 nft_expr_destroy(&ctx, set->exprs[i]);
5163 err_set_destroy:
5164         ops->destroy(&ctx, set);
5165 err_set_init:
5166         kfree(set->name);
5167 err_set_name:
5168         kvfree(set);
5169 err_alloc:
5170         nft_use_dec_restore(&table->use);
5171
5172         return err;
5173 }
5174
5175 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5176                                      struct nft_set *set)
5177 {
5178         struct nft_set_elem_catchall *next, *catchall;
5179
5180         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5181                 list_del_rcu(&catchall->list);
5182                 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5183                 kfree_rcu(catchall, rcu);
5184         }
5185 }
5186
5187 static void nft_set_put(struct nft_set *set)
5188 {
5189         if (refcount_dec_and_test(&set->refs)) {
5190                 kfree(set->name);
5191                 kvfree(set);
5192         }
5193 }
5194
5195 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5196 {
5197         int i;
5198
5199         if (WARN_ON(set->use > 0))
5200                 return;
5201
5202         for (i = 0; i < set->num_exprs; i++)
5203                 nft_expr_destroy(ctx, set->exprs[i]);
5204
5205         set->ops->destroy(ctx, set);
5206         nft_set_catchall_destroy(ctx, set);
5207         nft_set_put(set);
5208 }
5209
5210 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5211                             const struct nlattr * const nla[])
5212 {
5213         struct netlink_ext_ack *extack = info->extack;
5214         u8 genmask = nft_genmask_next(info->net);
5215         u8 family = info->nfmsg->nfgen_family;
5216         struct net *net = info->net;
5217         const struct nlattr *attr;
5218         struct nft_table *table;
5219         struct nft_set *set;
5220         struct nft_ctx ctx;
5221
5222         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5223                 return -EAFNOSUPPORT;
5224
5225         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5226                                  genmask, NETLINK_CB(skb).portid);
5227         if (IS_ERR(table)) {
5228                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5229                 return PTR_ERR(table);
5230         }
5231
5232         if (nla[NFTA_SET_HANDLE]) {
5233                 attr = nla[NFTA_SET_HANDLE];
5234                 set = nft_set_lookup_byhandle(table, attr, genmask);
5235         } else {
5236                 attr = nla[NFTA_SET_NAME];
5237                 set = nft_set_lookup(table, attr, genmask);
5238         }
5239
5240         if (IS_ERR(set)) {
5241                 if (PTR_ERR(set) == -ENOENT &&
5242                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5243                         return 0;
5244
5245                 NL_SET_BAD_ATTR(extack, attr);
5246                 return PTR_ERR(set);
5247         }
5248         if (set->use ||
5249             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5250              atomic_read(&set->nelems) > 0)) {
5251                 NL_SET_BAD_ATTR(extack, attr);
5252                 return -EBUSY;
5253         }
5254
5255         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5256
5257         return nft_delset(&ctx, set);
5258 }
5259
5260 static int nft_validate_register_store(const struct nft_ctx *ctx,
5261                                        enum nft_registers reg,
5262                                        const struct nft_data *data,
5263                                        enum nft_data_types type,
5264                                        unsigned int len);
5265
5266 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5267                                      struct nft_set *set,
5268                                      struct nft_set_elem *elem)
5269 {
5270         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5271         enum nft_registers dreg;
5272
5273         dreg = nft_type_to_reg(set->dtype);
5274         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5275                                            set->dtype == NFT_DATA_VERDICT ?
5276                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
5277                                            set->dlen);
5278 }
5279
5280 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5281                                         struct nft_set *set,
5282                                         const struct nft_set_iter *iter,
5283                                         struct nft_set_elem *elem)
5284 {
5285         return nft_setelem_data_validate(ctx, set, elem);
5286 }
5287
5288 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5289                                        struct nft_set *set)
5290 {
5291         u8 genmask = nft_genmask_next(ctx->net);
5292         struct nft_set_elem_catchall *catchall;
5293         struct nft_set_elem elem;
5294         struct nft_set_ext *ext;
5295         int ret = 0;
5296
5297         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5298                 ext = nft_set_elem_ext(set, catchall->elem);
5299                 if (!nft_set_elem_active(ext, genmask))
5300                         continue;
5301
5302                 elem.priv = catchall->elem;
5303                 ret = nft_setelem_data_validate(ctx, set, &elem);
5304                 if (ret < 0)
5305                         break;
5306         }
5307
5308         return ret;
5309 }
5310
5311 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5312                        struct nft_set_binding *binding)
5313 {
5314         struct nft_set_binding *i;
5315         struct nft_set_iter iter;
5316
5317         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5318                 return -EBUSY;
5319
5320         if (binding->flags & NFT_SET_MAP) {
5321                 /* If the set is already bound to the same chain all
5322                  * jumps are already validated for that chain.
5323                  */
5324                 list_for_each_entry(i, &set->bindings, list) {
5325                         if (i->flags & NFT_SET_MAP &&
5326                             i->chain == binding->chain)
5327                                 goto bind;
5328                 }
5329
5330                 iter.genmask    = nft_genmask_next(ctx->net);
5331                 iter.skip       = 0;
5332                 iter.count      = 0;
5333                 iter.err        = 0;
5334                 iter.fn         = nf_tables_bind_check_setelem;
5335
5336                 set->ops->walk(ctx, set, &iter);
5337                 if (!iter.err)
5338                         iter.err = nft_set_catchall_bind_check(ctx, set);
5339
5340                 if (iter.err < 0)
5341                         return iter.err;
5342         }
5343 bind:
5344         if (!nft_use_inc(&set->use))
5345                 return -EMFILE;
5346
5347         binding->chain = ctx->chain;
5348         list_add_tail_rcu(&binding->list, &set->bindings);
5349         nft_set_trans_bind(ctx, set);
5350
5351         return 0;
5352 }
5353 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5354
5355 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5356                                  struct nft_set_binding *binding, bool event)
5357 {
5358         list_del_rcu(&binding->list);
5359
5360         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5361                 list_del_rcu(&set->list);
5362                 if (event)
5363                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5364                                              GFP_KERNEL);
5365         }
5366 }
5367
5368 static void nft_setelem_data_activate(const struct net *net,
5369                                       const struct nft_set *set,
5370                                       struct nft_set_elem *elem);
5371
5372 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5373                                 struct nft_set *set,
5374                                 const struct nft_set_iter *iter,
5375                                 struct nft_set_elem *elem)
5376 {
5377         nft_setelem_data_activate(ctx->net, set, elem);
5378
5379         return 0;
5380 }
5381
5382 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5383                                       struct nft_set *set)
5384 {
5385         u8 genmask = nft_genmask_next(ctx->net);
5386         struct nft_set_elem_catchall *catchall;
5387         struct nft_set_elem elem;
5388         struct nft_set_ext *ext;
5389
5390         list_for_each_entry(catchall, &set->catchall_list, list) {
5391                 ext = nft_set_elem_ext(set, catchall->elem);
5392                 if (!nft_set_elem_active(ext, genmask))
5393                         continue;
5394
5395                 elem.priv = catchall->elem;
5396                 nft_setelem_data_activate(ctx->net, set, &elem);
5397                 break;
5398         }
5399 }
5400
5401 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5402 {
5403         struct nft_set_iter iter = {
5404                 .genmask        = nft_genmask_next(ctx->net),
5405                 .fn             = nft_mapelem_activate,
5406         };
5407
5408         set->ops->walk(ctx, set, &iter);
5409         WARN_ON_ONCE(iter.err);
5410
5411         nft_map_catchall_activate(ctx, set);
5412 }
5413
5414 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5415 {
5416         if (nft_set_is_anonymous(set)) {
5417                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5418                         nft_map_activate(ctx, set);
5419
5420                 nft_clear(ctx->net, set);
5421         }
5422
5423         nft_use_inc_restore(&set->use);
5424 }
5425 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5426
5427 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5428                               struct nft_set_binding *binding,
5429                               enum nft_trans_phase phase)
5430 {
5431         switch (phase) {
5432         case NFT_TRANS_PREPARE_ERROR:
5433                 nft_set_trans_unbind(ctx, set);
5434                 if (nft_set_is_anonymous(set))
5435                         nft_deactivate_next(ctx->net, set);
5436                 else
5437                         list_del_rcu(&binding->list);
5438
5439                 nft_use_dec(&set->use);
5440                 break;
5441         case NFT_TRANS_PREPARE:
5442                 if (nft_set_is_anonymous(set)) {
5443                         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5444                                 nft_map_deactivate(ctx, set);
5445
5446                         nft_deactivate_next(ctx->net, set);
5447                 }
5448                 nft_use_dec(&set->use);
5449                 return;
5450         case NFT_TRANS_ABORT:
5451         case NFT_TRANS_RELEASE:
5452                 if (nft_set_is_anonymous(set) &&
5453                     set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5454                         nft_map_deactivate(ctx, set);
5455
5456                 nft_use_dec(&set->use);
5457                 fallthrough;
5458         default:
5459                 nf_tables_unbind_set(ctx, set, binding,
5460                                      phase == NFT_TRANS_COMMIT);
5461         }
5462 }
5463 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5464
5465 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5466 {
5467         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5468                 nft_set_destroy(ctx, set);
5469 }
5470 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5471
5472 const struct nft_set_ext_type nft_set_ext_types[] = {
5473         [NFT_SET_EXT_KEY]               = {
5474                 .align  = __alignof__(u32),
5475         },
5476         [NFT_SET_EXT_DATA]              = {
5477                 .align  = __alignof__(u32),
5478         },
5479         [NFT_SET_EXT_EXPRESSIONS]       = {
5480                 .align  = __alignof__(struct nft_set_elem_expr),
5481         },
5482         [NFT_SET_EXT_OBJREF]            = {
5483                 .len    = sizeof(struct nft_object *),
5484                 .align  = __alignof__(struct nft_object *),
5485         },
5486         [NFT_SET_EXT_FLAGS]             = {
5487                 .len    = sizeof(u8),
5488                 .align  = __alignof__(u8),
5489         },
5490         [NFT_SET_EXT_TIMEOUT]           = {
5491                 .len    = sizeof(u64),
5492                 .align  = __alignof__(u64),
5493         },
5494         [NFT_SET_EXT_EXPIRATION]        = {
5495                 .len    = sizeof(u64),
5496                 .align  = __alignof__(u64),
5497         },
5498         [NFT_SET_EXT_USERDATA]          = {
5499                 .len    = sizeof(struct nft_userdata),
5500                 .align  = __alignof__(struct nft_userdata),
5501         },
5502         [NFT_SET_EXT_KEY_END]           = {
5503                 .align  = __alignof__(u32),
5504         },
5505 };
5506
5507 /*
5508  * Set elements
5509  */
5510
5511 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5512         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
5513         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
5514         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
5515         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
5516         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
5517         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
5518                                             .len = NFT_USERDATA_MAXLEN },
5519         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
5520         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
5521                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
5522         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
5523         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
5524 };
5525
5526 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5527         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
5528                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
5529         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
5530                                             .len = NFT_SET_MAXNAMELEN - 1 },
5531         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
5532         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
5533 };
5534
5535 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5536                                   const struct nft_set *set,
5537                                   const struct nft_set_ext *ext,
5538                                   bool reset)
5539 {
5540         struct nft_set_elem_expr *elem_expr;
5541         u32 size, num_exprs = 0;
5542         struct nft_expr *expr;
5543         struct nlattr *nest;
5544
5545         elem_expr = nft_set_ext_expr(ext);
5546         nft_setelem_expr_foreach(expr, elem_expr, size)
5547                 num_exprs++;
5548
5549         if (num_exprs == 1) {
5550                 expr = nft_setelem_expr_at(elem_expr, 0);
5551                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5552                         return -1;
5553
5554                 return 0;
5555         } else if (num_exprs > 1) {
5556                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5557                 if (nest == NULL)
5558                         goto nla_put_failure;
5559
5560                 nft_setelem_expr_foreach(expr, elem_expr, size) {
5561                         expr = nft_setelem_expr_at(elem_expr, size);
5562                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5563                                 goto nla_put_failure;
5564                 }
5565                 nla_nest_end(skb, nest);
5566         }
5567         return 0;
5568
5569 nla_put_failure:
5570         return -1;
5571 }
5572
5573 static int nf_tables_fill_setelem(struct sk_buff *skb,
5574                                   const struct nft_set *set,
5575                                   const struct nft_set_elem *elem,
5576                                   bool reset)
5577 {
5578         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5579         unsigned char *b = skb_tail_pointer(skb);
5580         struct nlattr *nest;
5581
5582         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5583         if (nest == NULL)
5584                 goto nla_put_failure;
5585
5586         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5587             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5588                           NFT_DATA_VALUE, set->klen) < 0)
5589                 goto nla_put_failure;
5590
5591         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5592             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5593                           NFT_DATA_VALUE, set->klen) < 0)
5594                 goto nla_put_failure;
5595
5596         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5597             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5598                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5599                           set->dlen) < 0)
5600                 goto nla_put_failure;
5601
5602         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5603             nft_set_elem_expr_dump(skb, set, ext, reset))
5604                 goto nla_put_failure;
5605
5606         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5607             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5608                            (*nft_set_ext_obj(ext))->key.name) < 0)
5609                 goto nla_put_failure;
5610
5611         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5612             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5613                          htonl(*nft_set_ext_flags(ext))))
5614                 goto nla_put_failure;
5615
5616         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5617             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5618                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5619                          NFTA_SET_ELEM_PAD))
5620                 goto nla_put_failure;
5621
5622         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5623                 u64 expires, now = get_jiffies_64();
5624
5625                 expires = *nft_set_ext_expiration(ext);
5626                 if (time_before64(now, expires))
5627                         expires -= now;
5628                 else
5629                         expires = 0;
5630
5631                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5632                                  nf_jiffies64_to_msecs(expires),
5633                                  NFTA_SET_ELEM_PAD))
5634                         goto nla_put_failure;
5635         }
5636
5637         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5638                 struct nft_userdata *udata;
5639
5640                 udata = nft_set_ext_userdata(ext);
5641                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5642                             udata->len + 1, udata->data))
5643                         goto nla_put_failure;
5644         }
5645
5646         nla_nest_end(skb, nest);
5647         return 0;
5648
5649 nla_put_failure:
5650         nlmsg_trim(skb, b);
5651         return -EMSGSIZE;
5652 }
5653
5654 struct nft_set_dump_args {
5655         const struct netlink_callback   *cb;
5656         struct nft_set_iter             iter;
5657         struct sk_buff                  *skb;
5658         bool                            reset;
5659 };
5660
5661 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5662                                   struct nft_set *set,
5663                                   const struct nft_set_iter *iter,
5664                                   struct nft_set_elem *elem)
5665 {
5666         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5667         struct nft_set_dump_args *args;
5668
5669         if (nft_set_elem_expired(ext) || nft_set_elem_is_dead(ext))
5670                 return 0;
5671
5672         args = container_of(iter, struct nft_set_dump_args, iter);
5673         return nf_tables_fill_setelem(args->skb, set, elem, args->reset);
5674 }
5675
5676 static void audit_log_nft_set_reset(const struct nft_table *table,
5677                                     unsigned int base_seq,
5678                                     unsigned int nentries)
5679 {
5680         char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
5681
5682         audit_log_nfcfg(buf, table->family, nentries,
5683                         AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
5684         kfree(buf);
5685 }
5686
5687 struct nft_set_dump_ctx {
5688         const struct nft_set    *set;
5689         struct nft_ctx          ctx;
5690 };
5691
5692 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5693                                  const struct nft_set *set, bool reset,
5694                                  unsigned int base_seq)
5695 {
5696         struct nft_set_elem_catchall *catchall;
5697         u8 genmask = nft_genmask_cur(net);
5698         struct nft_set_elem elem;
5699         struct nft_set_ext *ext;
5700         int ret = 0;
5701
5702         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5703                 ext = nft_set_elem_ext(set, catchall->elem);
5704                 if (!nft_set_elem_active(ext, genmask) ||
5705                     nft_set_elem_expired(ext))
5706                         continue;
5707
5708                 elem.priv = catchall->elem;
5709                 ret = nf_tables_fill_setelem(skb, set, &elem, reset);
5710                 if (reset && !ret)
5711                         audit_log_nft_set_reset(set->table, base_seq, 1);
5712                 break;
5713         }
5714
5715         return ret;
5716 }
5717
5718 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5719 {
5720         struct nft_set_dump_ctx *dump_ctx = cb->data;
5721         struct net *net = sock_net(skb->sk);
5722         struct nftables_pernet *nft_net;
5723         struct nft_table *table;
5724         struct nft_set *set;
5725         struct nft_set_dump_args args;
5726         bool set_found = false;
5727         struct nlmsghdr *nlh;
5728         struct nlattr *nest;
5729         bool reset = false;
5730         u32 portid, seq;
5731         int event;
5732
5733         rcu_read_lock();
5734         nft_net = nft_pernet(net);
5735         cb->seq = READ_ONCE(nft_net->base_seq);
5736
5737         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5738                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5739                     dump_ctx->ctx.family != table->family)
5740                         continue;
5741
5742                 if (table != dump_ctx->ctx.table)
5743                         continue;
5744
5745                 list_for_each_entry_rcu(set, &table->sets, list) {
5746                         if (set == dump_ctx->set) {
5747                                 set_found = true;
5748                                 break;
5749                         }
5750                 }
5751                 break;
5752         }
5753
5754         if (!set_found) {
5755                 rcu_read_unlock();
5756                 return -ENOENT;
5757         }
5758
5759         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5760         portid = NETLINK_CB(cb->skb).portid;
5761         seq    = cb->nlh->nlmsg_seq;
5762
5763         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5764                            table->family, NFNETLINK_V0, nft_base_seq(net));
5765         if (!nlh)
5766                 goto nla_put_failure;
5767
5768         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5769                 goto nla_put_failure;
5770         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5771                 goto nla_put_failure;
5772
5773         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5774         if (nest == NULL)
5775                 goto nla_put_failure;
5776
5777         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5778                 reset = true;
5779
5780         args.cb                 = cb;
5781         args.skb                = skb;
5782         args.reset              = reset;
5783         args.iter.genmask       = nft_genmask_cur(net);
5784         args.iter.skip          = cb->args[0];
5785         args.iter.count         = 0;
5786         args.iter.err           = 0;
5787         args.iter.fn            = nf_tables_dump_setelem;
5788         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5789
5790         if (!args.iter.err && args.iter.count == cb->args[0])
5791                 args.iter.err = nft_set_catchall_dump(net, skb, set,
5792                                                       reset, cb->seq);
5793         nla_nest_end(skb, nest);
5794         nlmsg_end(skb, nlh);
5795
5796         if (reset && args.iter.count > args.iter.skip)
5797                 audit_log_nft_set_reset(table, cb->seq,
5798                                         args.iter.count - args.iter.skip);
5799
5800         rcu_read_unlock();
5801
5802         if (args.iter.err && args.iter.err != -EMSGSIZE)
5803                 return args.iter.err;
5804         if (args.iter.count == cb->args[0])
5805                 return 0;
5806
5807         cb->args[0] = args.iter.count;
5808         return skb->len;
5809
5810 nla_put_failure:
5811         rcu_read_unlock();
5812         return -ENOSPC;
5813 }
5814
5815 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5816 {
5817         struct nft_set_dump_ctx *dump_ctx = cb->data;
5818
5819         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5820
5821         return cb->data ? 0 : -ENOMEM;
5822 }
5823
5824 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5825 {
5826         kfree(cb->data);
5827         return 0;
5828 }
5829
5830 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5831                                        const struct nft_ctx *ctx, u32 seq,
5832                                        u32 portid, int event, u16 flags,
5833                                        const struct nft_set *set,
5834                                        const struct nft_set_elem *elem,
5835                                        bool reset)
5836 {
5837         struct nlmsghdr *nlh;
5838         struct nlattr *nest;
5839         int err;
5840
5841         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5842         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5843                            NFNETLINK_V0, nft_base_seq(ctx->net));
5844         if (!nlh)
5845                 goto nla_put_failure;
5846
5847         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5848                 goto nla_put_failure;
5849         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5850                 goto nla_put_failure;
5851
5852         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5853         if (nest == NULL)
5854                 goto nla_put_failure;
5855
5856         err = nf_tables_fill_setelem(skb, set, elem, reset);
5857         if (err < 0)
5858                 goto nla_put_failure;
5859
5860         nla_nest_end(skb, nest);
5861
5862         nlmsg_end(skb, nlh);
5863         return 0;
5864
5865 nla_put_failure:
5866         nlmsg_trim(skb, nlh);
5867         return -1;
5868 }
5869
5870 static int nft_setelem_parse_flags(const struct nft_set *set,
5871                                    const struct nlattr *attr, u32 *flags)
5872 {
5873         if (attr == NULL)
5874                 return 0;
5875
5876         *flags = ntohl(nla_get_be32(attr));
5877         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5878                 return -EOPNOTSUPP;
5879         if (!(set->flags & NFT_SET_INTERVAL) &&
5880             *flags & NFT_SET_ELEM_INTERVAL_END)
5881                 return -EINVAL;
5882         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5883             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5884                 return -EINVAL;
5885
5886         return 0;
5887 }
5888
5889 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5890                                  struct nft_data *key, struct nlattr *attr)
5891 {
5892         struct nft_data_desc desc = {
5893                 .type   = NFT_DATA_VALUE,
5894                 .size   = NFT_DATA_VALUE_MAXLEN,
5895                 .len    = set->klen,
5896         };
5897
5898         return nft_data_init(ctx, key, &desc, attr);
5899 }
5900
5901 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5902                                   struct nft_data_desc *desc,
5903                                   struct nft_data *data,
5904                                   struct nlattr *attr)
5905 {
5906         u32 dtype;
5907
5908         if (set->dtype == NFT_DATA_VERDICT)
5909                 dtype = NFT_DATA_VERDICT;
5910         else
5911                 dtype = NFT_DATA_VALUE;
5912
5913         desc->type = dtype;
5914         desc->size = NFT_DATA_VALUE_MAXLEN;
5915         desc->len = set->dlen;
5916         desc->flags = NFT_DATA_DESC_SETELEM;
5917
5918         return nft_data_init(ctx, data, desc, attr);
5919 }
5920
5921 static void *nft_setelem_catchall_get(const struct net *net,
5922                                       const struct nft_set *set)
5923 {
5924         struct nft_set_elem_catchall *catchall;
5925         u8 genmask = nft_genmask_cur(net);
5926         struct nft_set_ext *ext;
5927         void *priv = NULL;
5928
5929         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5930                 ext = nft_set_elem_ext(set, catchall->elem);
5931                 if (!nft_set_elem_active(ext, genmask) ||
5932                     nft_set_elem_expired(ext))
5933                         continue;
5934
5935                 priv = catchall->elem;
5936                 break;
5937         }
5938
5939         return priv;
5940 }
5941
5942 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5943                            struct nft_set_elem *elem, u32 flags)
5944 {
5945         void *priv;
5946
5947         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5948                 priv = set->ops->get(ctx->net, set, elem, flags);
5949                 if (IS_ERR(priv))
5950                         return PTR_ERR(priv);
5951         } else {
5952                 priv = nft_setelem_catchall_get(ctx->net, set);
5953                 if (!priv)
5954                         return -ENOENT;
5955         }
5956         elem->priv = priv;
5957
5958         return 0;
5959 }
5960
5961 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5962                             const struct nlattr *attr, bool reset)
5963 {
5964         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5965         struct nft_set_elem elem;
5966         struct sk_buff *skb;
5967         uint32_t flags = 0;
5968         int err;
5969
5970         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5971                                           nft_set_elem_policy, NULL);
5972         if (err < 0)
5973                 return err;
5974
5975         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5976         if (err < 0)
5977                 return err;
5978
5979         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5980                 return -EINVAL;
5981
5982         if (nla[NFTA_SET_ELEM_KEY]) {
5983                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5984                                             nla[NFTA_SET_ELEM_KEY]);
5985                 if (err < 0)
5986                         return err;
5987         }
5988
5989         if (nla[NFTA_SET_ELEM_KEY_END]) {
5990                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5991                                             nla[NFTA_SET_ELEM_KEY_END]);
5992                 if (err < 0)
5993                         return err;
5994         }
5995
5996         err = nft_setelem_get(ctx, set, &elem, flags);
5997         if (err < 0)
5998                 return err;
5999
6000         err = -ENOMEM;
6001         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
6002         if (skb == NULL)
6003                 return err;
6004
6005         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
6006                                           NFT_MSG_NEWSETELEM, 0, set, &elem,
6007                                           reset);
6008         if (err < 0)
6009                 goto err_fill_setelem;
6010
6011         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
6012
6013 err_fill_setelem:
6014         kfree_skb(skb);
6015         return err;
6016 }
6017
6018 /* called with rcu_read_lock held */
6019 static int nf_tables_getsetelem(struct sk_buff *skb,
6020                                 const struct nfnl_info *info,
6021                                 const struct nlattr * const nla[])
6022 {
6023         struct netlink_ext_ack *extack = info->extack;
6024         u8 genmask = nft_genmask_cur(info->net);
6025         u8 family = info->nfmsg->nfgen_family;
6026         int rem, err = 0, nelems = 0;
6027         struct net *net = info->net;
6028         struct nft_table *table;
6029         struct nft_set *set;
6030         struct nlattr *attr;
6031         struct nft_ctx ctx;
6032         bool reset = false;
6033
6034         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6035                                  genmask, 0);
6036         if (IS_ERR(table)) {
6037                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6038                 return PTR_ERR(table);
6039         }
6040
6041         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6042         if (IS_ERR(set))
6043                 return PTR_ERR(set);
6044
6045         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6046
6047         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6048                 struct netlink_dump_control c = {
6049                         .start = nf_tables_dump_set_start,
6050                         .dump = nf_tables_dump_set,
6051                         .done = nf_tables_dump_set_done,
6052                         .module = THIS_MODULE,
6053                 };
6054                 struct nft_set_dump_ctx dump_ctx = {
6055                         .set = set,
6056                         .ctx = ctx,
6057                 };
6058
6059                 c.data = &dump_ctx;
6060                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6061         }
6062
6063         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6064                 return -EINVAL;
6065
6066         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
6067                 reset = true;
6068
6069         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6070                 err = nft_get_set_elem(&ctx, set, attr, reset);
6071                 if (err < 0) {
6072                         NL_SET_BAD_ATTR(extack, attr);
6073                         break;
6074                 }
6075                 nelems++;
6076         }
6077
6078         if (reset)
6079                 audit_log_nft_set_reset(table, nft_pernet(net)->base_seq,
6080                                         nelems);
6081
6082         return err;
6083 }
6084
6085 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
6086                                      const struct nft_set *set,
6087                                      const struct nft_set_elem *elem,
6088                                      int event)
6089 {
6090         struct nftables_pernet *nft_net;
6091         struct net *net = ctx->net;
6092         u32 portid = ctx->portid;
6093         struct sk_buff *skb;
6094         u16 flags = 0;
6095         int err;
6096
6097         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6098                 return;
6099
6100         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6101         if (skb == NULL)
6102                 goto err;
6103
6104         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6105                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6106
6107         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6108                                           set, elem, false);
6109         if (err < 0) {
6110                 kfree_skb(skb);
6111                 goto err;
6112         }
6113
6114         nft_net = nft_pernet(net);
6115         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6116         return;
6117 err:
6118         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6119 }
6120
6121 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6122                                               int msg_type,
6123                                               struct nft_set *set)
6124 {
6125         struct nft_trans *trans;
6126
6127         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6128         if (trans == NULL)
6129                 return NULL;
6130
6131         nft_trans_elem_set(trans) = set;
6132         return trans;
6133 }
6134
6135 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6136                                          const struct nft_set *set,
6137                                          const struct nlattr *attr)
6138 {
6139         struct nft_expr *expr;
6140         int err;
6141
6142         expr = nft_expr_init(ctx, attr);
6143         if (IS_ERR(expr))
6144                 return expr;
6145
6146         err = -EOPNOTSUPP;
6147         if (expr->ops->type->flags & NFT_EXPR_GC) {
6148                 if (set->flags & NFT_SET_TIMEOUT)
6149                         goto err_set_elem_expr;
6150                 if (!set->ops->gc_init)
6151                         goto err_set_elem_expr;
6152                 set->ops->gc_init(set);
6153         }
6154
6155         return expr;
6156
6157 err_set_elem_expr:
6158         nft_expr_destroy(ctx, expr);
6159         return ERR_PTR(err);
6160 }
6161
6162 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6163 {
6164         len += nft_set_ext_types[id].len;
6165         if (len > tmpl->ext_len[id] ||
6166             len > U8_MAX)
6167                 return -1;
6168
6169         return 0;
6170 }
6171
6172 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6173                               void *to, const void *from, u32 len)
6174 {
6175         if (nft_set_ext_check(tmpl, id, len) < 0)
6176                 return -1;
6177
6178         memcpy(to, from, len);
6179
6180         return 0;
6181 }
6182
6183 void *nft_set_elem_init(const struct nft_set *set,
6184                         const struct nft_set_ext_tmpl *tmpl,
6185                         const u32 *key, const u32 *key_end,
6186                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
6187 {
6188         struct nft_set_ext *ext;
6189         void *elem;
6190
6191         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6192         if (elem == NULL)
6193                 return ERR_PTR(-ENOMEM);
6194
6195         ext = nft_set_elem_ext(set, elem);
6196         nft_set_ext_init(ext, tmpl);
6197
6198         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6199             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6200                                nft_set_ext_key(ext), key, set->klen) < 0)
6201                 goto err_ext_check;
6202
6203         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6204             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6205                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6206                 goto err_ext_check;
6207
6208         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6209             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6210                                nft_set_ext_data(ext), data, set->dlen) < 0)
6211                 goto err_ext_check;
6212
6213         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6214                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6215                 if (expiration == 0)
6216                         *nft_set_ext_expiration(ext) += timeout;
6217         }
6218         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6219                 *nft_set_ext_timeout(ext) = timeout;
6220
6221         return elem;
6222
6223 err_ext_check:
6224         kfree(elem);
6225
6226         return ERR_PTR(-EINVAL);
6227 }
6228
6229 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6230                                         struct nft_expr *expr)
6231 {
6232         if (expr->ops->destroy_clone) {
6233                 expr->ops->destroy_clone(ctx, expr);
6234                 module_put(expr->ops->type->owner);
6235         } else {
6236                 nf_tables_expr_destroy(ctx, expr);
6237         }
6238 }
6239
6240 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6241                                       struct nft_set_elem_expr *elem_expr)
6242 {
6243         struct nft_expr *expr;
6244         u32 size;
6245
6246         nft_setelem_expr_foreach(expr, elem_expr, size)
6247                 __nft_set_elem_expr_destroy(ctx, expr);
6248 }
6249
6250 /* Drop references and destroy. Called from gc, dynset and abort path. */
6251 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
6252                           bool destroy_expr)
6253 {
6254         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6255         struct nft_ctx ctx = {
6256                 .net    = read_pnet(&set->net),
6257                 .family = set->table->family,
6258         };
6259
6260         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6261         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6262                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6263         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6264                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6265
6266         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6267                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6268         kfree(elem);
6269 }
6270 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6271
6272 /* Destroy element. References have been already dropped in the preparation
6273  * path via nft_setelem_data_deactivate().
6274  */
6275 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6276                                 const struct nft_set *set, void *elem)
6277 {
6278         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6279
6280         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6281                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6282
6283         kfree(elem);
6284 }
6285
6286 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6287                             struct nft_expr *expr_array[])
6288 {
6289         struct nft_expr *expr;
6290         int err, i, k;
6291
6292         for (i = 0; i < set->num_exprs; i++) {
6293                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6294                 if (!expr)
6295                         goto err_expr;
6296
6297                 err = nft_expr_clone(expr, set->exprs[i]);
6298                 if (err < 0) {
6299                         kfree(expr);
6300                         goto err_expr;
6301                 }
6302                 expr_array[i] = expr;
6303         }
6304
6305         return 0;
6306
6307 err_expr:
6308         for (k = i - 1; k >= 0; k--)
6309                 nft_expr_destroy(ctx, expr_array[k]);
6310
6311         return -ENOMEM;
6312 }
6313
6314 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6315                                    const struct nft_set_ext_tmpl *tmpl,
6316                                    const struct nft_set_ext *ext,
6317                                    struct nft_expr *expr_array[],
6318                                    u32 num_exprs)
6319 {
6320         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6321         u32 len = sizeof(struct nft_set_elem_expr);
6322         struct nft_expr *expr;
6323         int i, err;
6324
6325         if (num_exprs == 0)
6326                 return 0;
6327
6328         for (i = 0; i < num_exprs; i++)
6329                 len += expr_array[i]->ops->size;
6330
6331         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6332                 return -EINVAL;
6333
6334         for (i = 0; i < num_exprs; i++) {
6335                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6336                 err = nft_expr_clone(expr, expr_array[i]);
6337                 if (err < 0)
6338                         goto err_elem_expr_setup;
6339
6340                 elem_expr->size += expr_array[i]->ops->size;
6341                 nft_expr_destroy(ctx, expr_array[i]);
6342                 expr_array[i] = NULL;
6343         }
6344
6345         return 0;
6346
6347 err_elem_expr_setup:
6348         for (; i < num_exprs; i++) {
6349                 nft_expr_destroy(ctx, expr_array[i]);
6350                 expr_array[i] = NULL;
6351         }
6352
6353         return -ENOMEM;
6354 }
6355
6356 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6357                                             const struct nft_set *set)
6358 {
6359         struct nft_set_elem_catchall *catchall;
6360         u8 genmask = nft_genmask_cur(net);
6361         struct nft_set_ext *ext;
6362
6363         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6364                 ext = nft_set_elem_ext(set, catchall->elem);
6365                 if (nft_set_elem_active(ext, genmask) &&
6366                     !nft_set_elem_expired(ext) &&
6367                     !nft_set_elem_is_dead(ext))
6368                         return ext;
6369         }
6370
6371         return NULL;
6372 }
6373 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6374
6375 static int nft_setelem_catchall_insert(const struct net *net,
6376                                        struct nft_set *set,
6377                                        const struct nft_set_elem *elem,
6378                                        struct nft_set_ext **pext)
6379 {
6380         struct nft_set_elem_catchall *catchall;
6381         u8 genmask = nft_genmask_next(net);
6382         struct nft_set_ext *ext;
6383
6384         list_for_each_entry(catchall, &set->catchall_list, list) {
6385                 ext = nft_set_elem_ext(set, catchall->elem);
6386                 if (nft_set_elem_active(ext, genmask)) {
6387                         *pext = ext;
6388                         return -EEXIST;
6389                 }
6390         }
6391
6392         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6393         if (!catchall)
6394                 return -ENOMEM;
6395
6396         catchall->elem = elem->priv;
6397         list_add_tail_rcu(&catchall->list, &set->catchall_list);
6398
6399         return 0;
6400 }
6401
6402 static int nft_setelem_insert(const struct net *net,
6403                               struct nft_set *set,
6404                               const struct nft_set_elem *elem,
6405                               struct nft_set_ext **ext, unsigned int flags)
6406 {
6407         int ret;
6408
6409         if (flags & NFT_SET_ELEM_CATCHALL)
6410                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6411         else
6412                 ret = set->ops->insert(net, set, elem, ext);
6413
6414         return ret;
6415 }
6416
6417 static bool nft_setelem_is_catchall(const struct nft_set *set,
6418                                     const struct nft_set_elem *elem)
6419 {
6420         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6421
6422         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6423             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6424                 return true;
6425
6426         return false;
6427 }
6428
6429 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6430                                  struct nft_set_elem *elem)
6431 {
6432         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6433
6434         if (nft_setelem_is_catchall(set, elem)) {
6435                 nft_set_elem_change_active(net, set, ext);
6436         } else {
6437                 set->ops->activate(net, set, elem);
6438         }
6439 }
6440
6441 static int nft_setelem_catchall_deactivate(const struct net *net,
6442                                            struct nft_set *set,
6443                                            struct nft_set_elem *elem)
6444 {
6445         struct nft_set_elem_catchall *catchall;
6446         struct nft_set_ext *ext;
6447
6448         list_for_each_entry(catchall, &set->catchall_list, list) {
6449                 ext = nft_set_elem_ext(set, catchall->elem);
6450                 if (!nft_is_active_next(net, ext))
6451                         continue;
6452
6453                 kfree(elem->priv);
6454                 elem->priv = catchall->elem;
6455                 nft_set_elem_change_active(net, set, ext);
6456                 return 0;
6457         }
6458
6459         return -ENOENT;
6460 }
6461
6462 static int __nft_setelem_deactivate(const struct net *net,
6463                                     struct nft_set *set,
6464                                     struct nft_set_elem *elem)
6465 {
6466         void *priv;
6467
6468         priv = set->ops->deactivate(net, set, elem);
6469         if (!priv)
6470                 return -ENOENT;
6471
6472         kfree(elem->priv);
6473         elem->priv = priv;
6474         set->ndeact++;
6475
6476         return 0;
6477 }
6478
6479 static int nft_setelem_deactivate(const struct net *net,
6480                                   struct nft_set *set,
6481                                   struct nft_set_elem *elem, u32 flags)
6482 {
6483         int ret;
6484
6485         if (flags & NFT_SET_ELEM_CATCHALL)
6486                 ret = nft_setelem_catchall_deactivate(net, set, elem);
6487         else
6488                 ret = __nft_setelem_deactivate(net, set, elem);
6489
6490         return ret;
6491 }
6492
6493 static void nft_setelem_catchall_destroy(struct nft_set_elem_catchall *catchall)
6494 {
6495         list_del_rcu(&catchall->list);
6496         kfree_rcu(catchall, rcu);
6497 }
6498
6499 static void nft_setelem_catchall_remove(const struct net *net,
6500                                         const struct nft_set *set,
6501                                         const struct nft_set_elem *elem)
6502 {
6503         struct nft_set_elem_catchall *catchall, *next;
6504
6505         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6506                 if (catchall->elem == elem->priv) {
6507                         nft_setelem_catchall_destroy(catchall);
6508                         break;
6509                 }
6510         }
6511 }
6512
6513 static void nft_setelem_remove(const struct net *net,
6514                                const struct nft_set *set,
6515                                const struct nft_set_elem *elem)
6516 {
6517         if (nft_setelem_is_catchall(set, elem))
6518                 nft_setelem_catchall_remove(net, set, elem);
6519         else
6520                 set->ops->remove(net, set, elem);
6521 }
6522
6523 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6524                                       struct nlattr **nla, u32 flags)
6525 {
6526         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6527                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6528                 if (flags & NFT_SET_ELEM_INTERVAL_END)
6529                         return false;
6530
6531                 if (nla[NFTA_SET_ELEM_KEY_END] &&
6532                     flags & NFT_SET_ELEM_CATCHALL)
6533                         return false;
6534         } else {
6535                 if (nla[NFTA_SET_ELEM_KEY_END])
6536                         return false;
6537         }
6538
6539         return true;
6540 }
6541
6542 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6543                             const struct nlattr *attr, u32 nlmsg_flags)
6544 {
6545         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6546         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6547         u8 genmask = nft_genmask_next(ctx->net);
6548         u32 flags = 0, size = 0, num_exprs = 0;
6549         struct nft_set_ext_tmpl tmpl;
6550         struct nft_set_ext *ext, *ext2;
6551         struct nft_set_elem elem;
6552         struct nft_set_binding *binding;
6553         struct nft_object *obj = NULL;
6554         struct nft_userdata *udata;
6555         struct nft_data_desc desc;
6556         enum nft_registers dreg;
6557         struct nft_trans *trans;
6558         u64 timeout;
6559         u64 expiration;
6560         int err, i;
6561         u8 ulen;
6562
6563         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6564                                           nft_set_elem_policy, NULL);
6565         if (err < 0)
6566                 return err;
6567
6568         nft_set_ext_prepare(&tmpl);
6569
6570         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6571         if (err < 0)
6572                 return err;
6573
6574         if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6575             (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6576                 return -EINVAL;
6577
6578         if (flags != 0) {
6579                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6580                 if (err < 0)
6581                         return err;
6582         }
6583
6584         if (set->flags & NFT_SET_MAP) {
6585                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6586                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6587                         return -EINVAL;
6588         } else {
6589                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6590                         return -EINVAL;
6591         }
6592
6593         if (set->flags & NFT_SET_OBJECT) {
6594                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6595                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6596                         return -EINVAL;
6597         } else {
6598                 if (nla[NFTA_SET_ELEM_OBJREF])
6599                         return -EINVAL;
6600         }
6601
6602         if (!nft_setelem_valid_key_end(set, nla, flags))
6603                 return -EINVAL;
6604
6605         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6606              (nla[NFTA_SET_ELEM_DATA] ||
6607               nla[NFTA_SET_ELEM_OBJREF] ||
6608               nla[NFTA_SET_ELEM_TIMEOUT] ||
6609               nla[NFTA_SET_ELEM_EXPIRATION] ||
6610               nla[NFTA_SET_ELEM_USERDATA] ||
6611               nla[NFTA_SET_ELEM_EXPR] ||
6612               nla[NFTA_SET_ELEM_KEY_END] ||
6613               nla[NFTA_SET_ELEM_EXPRESSIONS]))
6614                 return -EINVAL;
6615
6616         timeout = 0;
6617         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6618                 if (!(set->flags & NFT_SET_TIMEOUT))
6619                         return -EINVAL;
6620                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6621                                             &timeout);
6622                 if (err)
6623                         return err;
6624         } else if (set->flags & NFT_SET_TIMEOUT &&
6625                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6626                 timeout = READ_ONCE(set->timeout);
6627         }
6628
6629         expiration = 0;
6630         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6631                 if (!(set->flags & NFT_SET_TIMEOUT))
6632                         return -EINVAL;
6633                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6634                                             &expiration);
6635                 if (err)
6636                         return err;
6637         }
6638
6639         if (nla[NFTA_SET_ELEM_EXPR]) {
6640                 struct nft_expr *expr;
6641
6642                 if (set->num_exprs && set->num_exprs != 1)
6643                         return -EOPNOTSUPP;
6644
6645                 expr = nft_set_elem_expr_alloc(ctx, set,
6646                                                nla[NFTA_SET_ELEM_EXPR]);
6647                 if (IS_ERR(expr))
6648                         return PTR_ERR(expr);
6649
6650                 expr_array[0] = expr;
6651                 num_exprs = 1;
6652
6653                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6654                         err = -EOPNOTSUPP;
6655                         goto err_set_elem_expr;
6656                 }
6657         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6658                 struct nft_expr *expr;
6659                 struct nlattr *tmp;
6660                 int left;
6661
6662                 i = 0;
6663                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6664                         if (i == NFT_SET_EXPR_MAX ||
6665                             (set->num_exprs && set->num_exprs == i)) {
6666                                 err = -E2BIG;
6667                                 goto err_set_elem_expr;
6668                         }
6669                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6670                                 err = -EINVAL;
6671                                 goto err_set_elem_expr;
6672                         }
6673                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6674                         if (IS_ERR(expr)) {
6675                                 err = PTR_ERR(expr);
6676                                 goto err_set_elem_expr;
6677                         }
6678                         expr_array[i] = expr;
6679                         num_exprs++;
6680
6681                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6682                                 err = -EOPNOTSUPP;
6683                                 goto err_set_elem_expr;
6684                         }
6685                         i++;
6686                 }
6687                 if (set->num_exprs && set->num_exprs != i) {
6688                         err = -EOPNOTSUPP;
6689                         goto err_set_elem_expr;
6690                 }
6691         } else if (set->num_exprs > 0 &&
6692                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6693                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6694                 if (err < 0)
6695                         goto err_set_elem_expr_clone;
6696
6697                 num_exprs = set->num_exprs;
6698         }
6699
6700         if (nla[NFTA_SET_ELEM_KEY]) {
6701                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6702                                             nla[NFTA_SET_ELEM_KEY]);
6703                 if (err < 0)
6704                         goto err_set_elem_expr;
6705
6706                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6707                 if (err < 0)
6708                         goto err_parse_key;
6709         }
6710
6711         if (nla[NFTA_SET_ELEM_KEY_END]) {
6712                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6713                                             nla[NFTA_SET_ELEM_KEY_END]);
6714                 if (err < 0)
6715                         goto err_parse_key;
6716
6717                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6718                 if (err < 0)
6719                         goto err_parse_key_end;
6720         }
6721
6722         if (timeout > 0) {
6723                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6724                 if (err < 0)
6725                         goto err_parse_key_end;
6726
6727                 if (timeout != READ_ONCE(set->timeout)) {
6728                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6729                         if (err < 0)
6730                                 goto err_parse_key_end;
6731                 }
6732         }
6733
6734         if (num_exprs) {
6735                 for (i = 0; i < num_exprs; i++)
6736                         size += expr_array[i]->ops->size;
6737
6738                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6739                                              sizeof(struct nft_set_elem_expr) + size);
6740                 if (err < 0)
6741                         goto err_parse_key_end;
6742         }
6743
6744         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6745                 obj = nft_obj_lookup(ctx->net, ctx->table,
6746                                      nla[NFTA_SET_ELEM_OBJREF],
6747                                      set->objtype, genmask);
6748                 if (IS_ERR(obj)) {
6749                         err = PTR_ERR(obj);
6750                         obj = NULL;
6751                         goto err_parse_key_end;
6752                 }
6753
6754                 if (!nft_use_inc(&obj->use)) {
6755                         err = -EMFILE;
6756                         obj = NULL;
6757                         goto err_parse_key_end;
6758                 }
6759
6760                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6761                 if (err < 0)
6762                         goto err_parse_key_end;
6763         }
6764
6765         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6766                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6767                                              nla[NFTA_SET_ELEM_DATA]);
6768                 if (err < 0)
6769                         goto err_parse_key_end;
6770
6771                 dreg = nft_type_to_reg(set->dtype);
6772                 list_for_each_entry(binding, &set->bindings, list) {
6773                         struct nft_ctx bind_ctx = {
6774                                 .net    = ctx->net,
6775                                 .family = ctx->family,
6776                                 .table  = ctx->table,
6777                                 .chain  = (struct nft_chain *)binding->chain,
6778                         };
6779
6780                         if (!(binding->flags & NFT_SET_MAP))
6781                                 continue;
6782
6783                         err = nft_validate_register_store(&bind_ctx, dreg,
6784                                                           &elem.data.val,
6785                                                           desc.type, desc.len);
6786                         if (err < 0)
6787                                 goto err_parse_data;
6788
6789                         if (desc.type == NFT_DATA_VERDICT &&
6790                             (elem.data.val.verdict.code == NFT_GOTO ||
6791                              elem.data.val.verdict.code == NFT_JUMP))
6792                                 nft_validate_state_update(ctx->table,
6793                                                           NFT_VALIDATE_NEED);
6794                 }
6795
6796                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6797                 if (err < 0)
6798                         goto err_parse_data;
6799         }
6800
6801         /* The full maximum length of userdata can exceed the maximum
6802          * offset value (U8_MAX) for following extensions, therefor it
6803          * must be the last extension added.
6804          */
6805         ulen = 0;
6806         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6807                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6808                 if (ulen > 0) {
6809                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6810                                                      ulen);
6811                         if (err < 0)
6812                                 goto err_parse_data;
6813                 }
6814         }
6815
6816         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6817                                       elem.key_end.val.data, elem.data.val.data,
6818                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6819         if (IS_ERR(elem.priv)) {
6820                 err = PTR_ERR(elem.priv);
6821                 goto err_parse_data;
6822         }
6823
6824         ext = nft_set_elem_ext(set, elem.priv);
6825         if (flags)
6826                 *nft_set_ext_flags(ext) = flags;
6827
6828         if (obj)
6829                 *nft_set_ext_obj(ext) = obj;
6830
6831         if (ulen > 0) {
6832                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6833                         err = -EINVAL;
6834                         goto err_elem_free;
6835                 }
6836                 udata = nft_set_ext_userdata(ext);
6837                 udata->len = ulen - 1;
6838                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6839         }
6840         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6841         if (err < 0)
6842                 goto err_elem_free;
6843
6844         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6845         if (trans == NULL) {
6846                 err = -ENOMEM;
6847                 goto err_elem_free;
6848         }
6849
6850         ext->genmask = nft_genmask_cur(ctx->net);
6851
6852         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6853         if (err) {
6854                 if (err == -EEXIST) {
6855                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6856                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6857                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6858                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6859                                 goto err_element_clash;
6860                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6861                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6862                              memcmp(nft_set_ext_data(ext),
6863                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6864                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6865                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6866                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6867                                 goto err_element_clash;
6868                         else if (!(nlmsg_flags & NLM_F_EXCL))
6869                                 err = 0;
6870                 } else if (err == -ENOTEMPTY) {
6871                         /* ENOTEMPTY reports overlapping between this element
6872                          * and an existing one.
6873                          */
6874                         err = -EEXIST;
6875                 }
6876                 goto err_element_clash;
6877         }
6878
6879         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6880                 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
6881
6882                 if (!atomic_add_unless(&set->nelems, 1, max)) {
6883                         err = -ENFILE;
6884                         goto err_set_full;
6885                 }
6886         }
6887
6888         nft_trans_elem(trans) = elem;
6889         nft_trans_commit_list_add_tail(ctx->net, trans);
6890         return 0;
6891
6892 err_set_full:
6893         nft_setelem_remove(ctx->net, set, &elem);
6894 err_element_clash:
6895         kfree(trans);
6896 err_elem_free:
6897         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6898 err_parse_data:
6899         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6900                 nft_data_release(&elem.data.val, desc.type);
6901 err_parse_key_end:
6902         if (obj)
6903                 nft_use_dec_restore(&obj->use);
6904
6905         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6906 err_parse_key:
6907         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6908 err_set_elem_expr:
6909         for (i = 0; i < num_exprs && expr_array[i]; i++)
6910                 nft_expr_destroy(ctx, expr_array[i]);
6911 err_set_elem_expr_clone:
6912         return err;
6913 }
6914
6915 static int nf_tables_newsetelem(struct sk_buff *skb,
6916                                 const struct nfnl_info *info,
6917                                 const struct nlattr * const nla[])
6918 {
6919         struct netlink_ext_ack *extack = info->extack;
6920         u8 genmask = nft_genmask_next(info->net);
6921         u8 family = info->nfmsg->nfgen_family;
6922         struct net *net = info->net;
6923         const struct nlattr *attr;
6924         struct nft_table *table;
6925         struct nft_set *set;
6926         struct nft_ctx ctx;
6927         int rem, err;
6928
6929         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6930                 return -EINVAL;
6931
6932         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6933                                  genmask, NETLINK_CB(skb).portid);
6934         if (IS_ERR(table)) {
6935                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6936                 return PTR_ERR(table);
6937         }
6938
6939         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6940                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6941         if (IS_ERR(set))
6942                 return PTR_ERR(set);
6943
6944         if (!list_empty(&set->bindings) &&
6945             (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
6946                 return -EBUSY;
6947
6948         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6949
6950         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6951                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6952                 if (err < 0) {
6953                         NL_SET_BAD_ATTR(extack, attr);
6954                         return err;
6955                 }
6956         }
6957
6958         if (table->validate_state == NFT_VALIDATE_DO)
6959                 return nft_table_validate(net, table);
6960
6961         return 0;
6962 }
6963
6964 /**
6965  *      nft_data_hold - hold a nft_data item
6966  *
6967  *      @data: struct nft_data to release
6968  *      @type: type of data
6969  *
6970  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6971  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6972  *      NFT_GOTO verdicts. This function must be called on active data objects
6973  *      from the second phase of the commit protocol.
6974  */
6975 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6976 {
6977         struct nft_chain *chain;
6978
6979         if (type == NFT_DATA_VERDICT) {
6980                 switch (data->verdict.code) {
6981                 case NFT_JUMP:
6982                 case NFT_GOTO:
6983                         chain = data->verdict.chain;
6984                         nft_use_inc_restore(&chain->use);
6985                         break;
6986                 }
6987         }
6988 }
6989
6990 static void nft_setelem_data_activate(const struct net *net,
6991                                       const struct nft_set *set,
6992                                       struct nft_set_elem *elem)
6993 {
6994         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6995
6996         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6997                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6998         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6999                 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
7000 }
7001
7002 void nft_setelem_data_deactivate(const struct net *net,
7003                                  const struct nft_set *set,
7004                                  struct nft_set_elem *elem)
7005 {
7006         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
7007
7008         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7009                 nft_data_release(nft_set_ext_data(ext), set->dtype);
7010         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7011                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
7012 }
7013
7014 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
7015                            const struct nlattr *attr)
7016 {
7017         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
7018         struct nft_set_ext_tmpl tmpl;
7019         struct nft_set_elem elem;
7020         struct nft_set_ext *ext;
7021         struct nft_trans *trans;
7022         u32 flags = 0;
7023         int err;
7024
7025         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
7026                                           nft_set_elem_policy, NULL);
7027         if (err < 0)
7028                 return err;
7029
7030         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
7031         if (err < 0)
7032                 return err;
7033
7034         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
7035                 return -EINVAL;
7036
7037         if (!nft_setelem_valid_key_end(set, nla, flags))
7038                 return -EINVAL;
7039
7040         nft_set_ext_prepare(&tmpl);
7041
7042         if (flags != 0) {
7043                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
7044                 if (err < 0)
7045                         return err;
7046         }
7047
7048         if (nla[NFTA_SET_ELEM_KEY]) {
7049                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
7050                                             nla[NFTA_SET_ELEM_KEY]);
7051                 if (err < 0)
7052                         return err;
7053
7054                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7055                 if (err < 0)
7056                         goto fail_elem;
7057         }
7058
7059         if (nla[NFTA_SET_ELEM_KEY_END]) {
7060                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
7061                                             nla[NFTA_SET_ELEM_KEY_END]);
7062                 if (err < 0)
7063                         goto fail_elem;
7064
7065                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
7066                 if (err < 0)
7067                         goto fail_elem_key_end;
7068         }
7069
7070         err = -ENOMEM;
7071         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7072                                       elem.key_end.val.data, NULL, 0, 0,
7073                                       GFP_KERNEL_ACCOUNT);
7074         if (IS_ERR(elem.priv)) {
7075                 err = PTR_ERR(elem.priv);
7076                 goto fail_elem_key_end;
7077         }
7078
7079         ext = nft_set_elem_ext(set, elem.priv);
7080         if (flags)
7081                 *nft_set_ext_flags(ext) = flags;
7082
7083         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7084         if (trans == NULL)
7085                 goto fail_trans;
7086
7087         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7088         if (err < 0)
7089                 goto fail_ops;
7090
7091         nft_setelem_data_deactivate(ctx->net, set, &elem);
7092
7093         nft_trans_elem(trans) = elem;
7094         nft_trans_commit_list_add_tail(ctx->net, trans);
7095         return 0;
7096
7097 fail_ops:
7098         kfree(trans);
7099 fail_trans:
7100         kfree(elem.priv);
7101 fail_elem_key_end:
7102         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7103 fail_elem:
7104         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7105         return err;
7106 }
7107
7108 static int nft_setelem_flush(const struct nft_ctx *ctx,
7109                              struct nft_set *set,
7110                              const struct nft_set_iter *iter,
7111                              struct nft_set_elem *elem)
7112 {
7113         struct nft_trans *trans;
7114         int err;
7115
7116         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7117                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
7118         if (!trans)
7119                 return -ENOMEM;
7120
7121         if (!set->ops->flush(ctx->net, set, elem->priv)) {
7122                 err = -ENOENT;
7123                 goto err1;
7124         }
7125         set->ndeact++;
7126
7127         nft_setelem_data_deactivate(ctx->net, set, elem);
7128         nft_trans_elem_set(trans) = set;
7129         nft_trans_elem(trans) = *elem;
7130         nft_trans_commit_list_add_tail(ctx->net, trans);
7131
7132         return 0;
7133 err1:
7134         kfree(trans);
7135         return err;
7136 }
7137
7138 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7139                                     struct nft_set *set,
7140                                     struct nft_set_elem *elem)
7141 {
7142         struct nft_trans *trans;
7143
7144         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7145                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
7146         if (!trans)
7147                 return -ENOMEM;
7148
7149         nft_setelem_data_deactivate(ctx->net, set, elem);
7150         nft_trans_elem_set(trans) = set;
7151         nft_trans_elem(trans) = *elem;
7152         nft_trans_commit_list_add_tail(ctx->net, trans);
7153
7154         return 0;
7155 }
7156
7157 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7158                                   struct nft_set *set)
7159 {
7160         u8 genmask = nft_genmask_next(ctx->net);
7161         struct nft_set_elem_catchall *catchall;
7162         struct nft_set_elem elem;
7163         struct nft_set_ext *ext;
7164         int ret = 0;
7165
7166         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7167                 ext = nft_set_elem_ext(set, catchall->elem);
7168                 if (!nft_set_elem_active(ext, genmask))
7169                         continue;
7170
7171                 elem.priv = catchall->elem;
7172                 ret = __nft_set_catchall_flush(ctx, set, &elem);
7173                 if (ret < 0)
7174                         break;
7175                 nft_set_elem_change_active(ctx->net, set, ext);
7176         }
7177
7178         return ret;
7179 }
7180
7181 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7182 {
7183         struct nft_set_iter iter = {
7184                 .genmask        = genmask,
7185                 .fn             = nft_setelem_flush,
7186         };
7187
7188         set->ops->walk(ctx, set, &iter);
7189         if (!iter.err)
7190                 iter.err = nft_set_catchall_flush(ctx, set);
7191
7192         return iter.err;
7193 }
7194
7195 static int nf_tables_delsetelem(struct sk_buff *skb,
7196                                 const struct nfnl_info *info,
7197                                 const struct nlattr * const nla[])
7198 {
7199         struct netlink_ext_ack *extack = info->extack;
7200         u8 genmask = nft_genmask_next(info->net);
7201         u8 family = info->nfmsg->nfgen_family;
7202         struct net *net = info->net;
7203         const struct nlattr *attr;
7204         struct nft_table *table;
7205         struct nft_set *set;
7206         struct nft_ctx ctx;
7207         int rem, err = 0;
7208
7209         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7210                                  genmask, NETLINK_CB(skb).portid);
7211         if (IS_ERR(table)) {
7212                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7213                 return PTR_ERR(table);
7214         }
7215
7216         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7217         if (IS_ERR(set))
7218                 return PTR_ERR(set);
7219
7220         if (nft_set_is_anonymous(set))
7221                 return -EOPNOTSUPP;
7222
7223         if (!list_empty(&set->bindings) && (set->flags & NFT_SET_CONSTANT))
7224                 return -EBUSY;
7225
7226         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7227
7228         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7229                 return nft_set_flush(&ctx, set, genmask);
7230
7231         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7232                 err = nft_del_setelem(&ctx, set, attr);
7233                 if (err == -ENOENT &&
7234                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7235                         continue;
7236
7237                 if (err < 0) {
7238                         NL_SET_BAD_ATTR(extack, attr);
7239                         return err;
7240                 }
7241         }
7242
7243         return 0;
7244 }
7245
7246 /*
7247  * Stateful objects
7248  */
7249
7250 /**
7251  *      nft_register_obj- register nf_tables stateful object type
7252  *      @obj_type: object type
7253  *
7254  *      Registers the object type for use with nf_tables. Returns zero on
7255  *      success or a negative errno code otherwise.
7256  */
7257 int nft_register_obj(struct nft_object_type *obj_type)
7258 {
7259         if (obj_type->type == NFT_OBJECT_UNSPEC)
7260                 return -EINVAL;
7261
7262         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7263         list_add_rcu(&obj_type->list, &nf_tables_objects);
7264         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7265         return 0;
7266 }
7267 EXPORT_SYMBOL_GPL(nft_register_obj);
7268
7269 /**
7270  *      nft_unregister_obj - unregister nf_tables object type
7271  *      @obj_type: object type
7272  *
7273  *      Unregisters the object type for use with nf_tables.
7274  */
7275 void nft_unregister_obj(struct nft_object_type *obj_type)
7276 {
7277         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7278         list_del_rcu(&obj_type->list);
7279         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7280 }
7281 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7282
7283 struct nft_object *nft_obj_lookup(const struct net *net,
7284                                   const struct nft_table *table,
7285                                   const struct nlattr *nla, u32 objtype,
7286                                   u8 genmask)
7287 {
7288         struct nft_object_hash_key k = { .table = table };
7289         char search[NFT_OBJ_MAXNAMELEN];
7290         struct rhlist_head *tmp, *list;
7291         struct nft_object *obj;
7292
7293         nla_strscpy(search, nla, sizeof(search));
7294         k.name = search;
7295
7296         WARN_ON_ONCE(!rcu_read_lock_held() &&
7297                      !lockdep_commit_lock_is_held(net));
7298
7299         rcu_read_lock();
7300         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7301         if (!list)
7302                 goto out;
7303
7304         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7305                 if (objtype == obj->ops->type->type &&
7306                     nft_active_genmask(obj, genmask)) {
7307                         rcu_read_unlock();
7308                         return obj;
7309                 }
7310         }
7311 out:
7312         rcu_read_unlock();
7313         return ERR_PTR(-ENOENT);
7314 }
7315 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7316
7317 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7318                                                   const struct nlattr *nla,
7319                                                   u32 objtype, u8 genmask)
7320 {
7321         struct nft_object *obj;
7322
7323         list_for_each_entry(obj, &table->objects, list) {
7324                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7325                     objtype == obj->ops->type->type &&
7326                     nft_active_genmask(obj, genmask))
7327                         return obj;
7328         }
7329         return ERR_PTR(-ENOENT);
7330 }
7331
7332 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7333         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
7334                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
7335         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
7336                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
7337         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
7338         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
7339         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
7340         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
7341                                     .len = NFT_USERDATA_MAXLEN },
7342 };
7343
7344 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7345                                        const struct nft_object_type *type,
7346                                        const struct nlattr *attr)
7347 {
7348         struct nlattr **tb;
7349         const struct nft_object_ops *ops;
7350         struct nft_object *obj;
7351         int err = -ENOMEM;
7352
7353         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7354         if (!tb)
7355                 goto err1;
7356
7357         if (attr) {
7358                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7359                                                   type->policy, NULL);
7360                 if (err < 0)
7361                         goto err2;
7362         } else {
7363                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7364         }
7365
7366         if (type->select_ops) {
7367                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7368                 if (IS_ERR(ops)) {
7369                         err = PTR_ERR(ops);
7370                         goto err2;
7371                 }
7372         } else {
7373                 ops = type->ops;
7374         }
7375
7376         err = -ENOMEM;
7377         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7378         if (!obj)
7379                 goto err2;
7380
7381         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7382         if (err < 0)
7383                 goto err3;
7384
7385         obj->ops = ops;
7386
7387         kfree(tb);
7388         return obj;
7389 err3:
7390         kfree(obj);
7391 err2:
7392         kfree(tb);
7393 err1:
7394         return ERR_PTR(err);
7395 }
7396
7397 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7398                            struct nft_object *obj, bool reset)
7399 {
7400         struct nlattr *nest;
7401
7402         nest = nla_nest_start_noflag(skb, attr);
7403         if (!nest)
7404                 goto nla_put_failure;
7405         if (obj->ops->dump(skb, obj, reset) < 0)
7406                 goto nla_put_failure;
7407         nla_nest_end(skb, nest);
7408         return 0;
7409
7410 nla_put_failure:
7411         return -1;
7412 }
7413
7414 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
7415 {
7416         const struct nft_object_type *type;
7417
7418         list_for_each_entry(type, &nf_tables_objects, list) {
7419                 if (objtype == type->type)
7420                         return type;
7421         }
7422         return NULL;
7423 }
7424
7425 static const struct nft_object_type *
7426 nft_obj_type_get(struct net *net, u32 objtype)
7427 {
7428         const struct nft_object_type *type;
7429
7430         type = __nft_obj_type_get(objtype);
7431         if (type != NULL && try_module_get(type->owner))
7432                 return type;
7433
7434         lockdep_nfnl_nft_mutex_not_held();
7435 #ifdef CONFIG_MODULES
7436         if (type == NULL) {
7437                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7438                         return ERR_PTR(-EAGAIN);
7439         }
7440 #endif
7441         return ERR_PTR(-ENOENT);
7442 }
7443
7444 static int nf_tables_updobj(const struct nft_ctx *ctx,
7445                             const struct nft_object_type *type,
7446                             const struct nlattr *attr,
7447                             struct nft_object *obj)
7448 {
7449         struct nft_object *newobj;
7450         struct nft_trans *trans;
7451         int err = -ENOMEM;
7452
7453         if (!try_module_get(type->owner))
7454                 return -ENOENT;
7455
7456         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7457                                 sizeof(struct nft_trans_obj));
7458         if (!trans)
7459                 goto err_trans;
7460
7461         newobj = nft_obj_init(ctx, type, attr);
7462         if (IS_ERR(newobj)) {
7463                 err = PTR_ERR(newobj);
7464                 goto err_free_trans;
7465         }
7466
7467         nft_trans_obj(trans) = obj;
7468         nft_trans_obj_update(trans) = true;
7469         nft_trans_obj_newobj(trans) = newobj;
7470         nft_trans_commit_list_add_tail(ctx->net, trans);
7471
7472         return 0;
7473
7474 err_free_trans:
7475         kfree(trans);
7476 err_trans:
7477         module_put(type->owner);
7478         return err;
7479 }
7480
7481 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7482                             const struct nlattr * const nla[])
7483 {
7484         struct netlink_ext_ack *extack = info->extack;
7485         u8 genmask = nft_genmask_next(info->net);
7486         u8 family = info->nfmsg->nfgen_family;
7487         const struct nft_object_type *type;
7488         struct net *net = info->net;
7489         struct nft_table *table;
7490         struct nft_object *obj;
7491         struct nft_ctx ctx;
7492         u32 objtype;
7493         int err;
7494
7495         if (!nla[NFTA_OBJ_TYPE] ||
7496             !nla[NFTA_OBJ_NAME] ||
7497             !nla[NFTA_OBJ_DATA])
7498                 return -EINVAL;
7499
7500         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7501                                  NETLINK_CB(skb).portid);
7502         if (IS_ERR(table)) {
7503                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7504                 return PTR_ERR(table);
7505         }
7506
7507         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7508         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7509         if (IS_ERR(obj)) {
7510                 err = PTR_ERR(obj);
7511                 if (err != -ENOENT) {
7512                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7513                         return err;
7514                 }
7515         } else {
7516                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7517                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7518                         return -EEXIST;
7519                 }
7520                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7521                         return -EOPNOTSUPP;
7522
7523                 type = __nft_obj_type_get(objtype);
7524                 if (WARN_ON_ONCE(!type))
7525                         return -ENOENT;
7526
7527                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7528
7529                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7530         }
7531
7532         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7533
7534         if (!nft_use_inc(&table->use))
7535                 return -EMFILE;
7536
7537         type = nft_obj_type_get(net, objtype);
7538         if (IS_ERR(type)) {
7539                 err = PTR_ERR(type);
7540                 goto err_type;
7541         }
7542
7543         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7544         if (IS_ERR(obj)) {
7545                 err = PTR_ERR(obj);
7546                 goto err_init;
7547         }
7548         obj->key.table = table;
7549         obj->handle = nf_tables_alloc_handle(table);
7550
7551         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7552         if (!obj->key.name) {
7553                 err = -ENOMEM;
7554                 goto err_strdup;
7555         }
7556
7557         if (nla[NFTA_OBJ_USERDATA]) {
7558                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7559                 if (obj->udata == NULL)
7560                         goto err_userdata;
7561
7562                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7563         }
7564
7565         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7566         if (err < 0)
7567                 goto err_trans;
7568
7569         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7570                               nft_objname_ht_params);
7571         if (err < 0)
7572                 goto err_obj_ht;
7573
7574         list_add_tail_rcu(&obj->list, &table->objects);
7575
7576         return 0;
7577 err_obj_ht:
7578         /* queued in transaction log */
7579         INIT_LIST_HEAD(&obj->list);
7580         return err;
7581 err_trans:
7582         kfree(obj->udata);
7583 err_userdata:
7584         kfree(obj->key.name);
7585 err_strdup:
7586         if (obj->ops->destroy)
7587                 obj->ops->destroy(&ctx, obj);
7588         kfree(obj);
7589 err_init:
7590         module_put(type->owner);
7591 err_type:
7592         nft_use_dec_restore(&table->use);
7593
7594         return err;
7595 }
7596
7597 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7598                                    u32 portid, u32 seq, int event, u32 flags,
7599                                    int family, const struct nft_table *table,
7600                                    struct nft_object *obj, bool reset)
7601 {
7602         struct nlmsghdr *nlh;
7603
7604         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7605         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7606                            NFNETLINK_V0, nft_base_seq(net));
7607         if (!nlh)
7608                 goto nla_put_failure;
7609
7610         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7611             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7612             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7613                          NFTA_OBJ_PAD))
7614                 goto nla_put_failure;
7615
7616         if (event == NFT_MSG_DELOBJ) {
7617                 nlmsg_end(skb, nlh);
7618                 return 0;
7619         }
7620
7621         if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7622             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7623             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7624                 goto nla_put_failure;
7625
7626         if (obj->udata &&
7627             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7628                 goto nla_put_failure;
7629
7630         nlmsg_end(skb, nlh);
7631         return 0;
7632
7633 nla_put_failure:
7634         nlmsg_trim(skb, nlh);
7635         return -1;
7636 }
7637
7638 static void audit_log_obj_reset(const struct nft_table *table,
7639                                 unsigned int base_seq, unsigned int nentries)
7640 {
7641         char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
7642
7643         audit_log_nfcfg(buf, table->family, nentries,
7644                         AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
7645         kfree(buf);
7646 }
7647
7648 struct nft_obj_filter {
7649         char            *table;
7650         u32             type;
7651 };
7652
7653 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7654 {
7655         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7656         const struct nft_table *table;
7657         unsigned int idx = 0, s_idx = cb->args[0];
7658         struct nft_obj_filter *filter = cb->data;
7659         struct net *net = sock_net(skb->sk);
7660         int family = nfmsg->nfgen_family;
7661         struct nftables_pernet *nft_net;
7662         unsigned int entries = 0;
7663         struct nft_object *obj;
7664         bool reset = false;
7665         int rc = 0;
7666
7667         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7668                 reset = true;
7669
7670         rcu_read_lock();
7671         nft_net = nft_pernet(net);
7672         cb->seq = READ_ONCE(nft_net->base_seq);
7673
7674         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7675                 if (family != NFPROTO_UNSPEC && family != table->family)
7676                         continue;
7677
7678                 entries = 0;
7679                 list_for_each_entry_rcu(obj, &table->objects, list) {
7680                         if (!nft_is_active(net, obj))
7681                                 goto cont;
7682                         if (idx < s_idx)
7683                                 goto cont;
7684                         if (idx > s_idx)
7685                                 memset(&cb->args[1], 0,
7686                                        sizeof(cb->args) - sizeof(cb->args[0]));
7687                         if (filter && filter->table &&
7688                             strcmp(filter->table, table->name))
7689                                 goto cont;
7690                         if (filter &&
7691                             filter->type != NFT_OBJECT_UNSPEC &&
7692                             obj->ops->type->type != filter->type)
7693                                 goto cont;
7694
7695                         rc = nf_tables_fill_obj_info(skb, net,
7696                                                      NETLINK_CB(cb->skb).portid,
7697                                                      cb->nlh->nlmsg_seq,
7698                                                      NFT_MSG_NEWOBJ,
7699                                                      NLM_F_MULTI | NLM_F_APPEND,
7700                                                      table->family, table,
7701                                                      obj, reset);
7702                         if (rc < 0)
7703                                 break;
7704
7705                         entries++;
7706                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7707 cont:
7708                         idx++;
7709                 }
7710                 if (reset && entries)
7711                         audit_log_obj_reset(table, nft_net->base_seq, entries);
7712                 if (rc < 0)
7713                         break;
7714         }
7715         rcu_read_unlock();
7716
7717         cb->args[0] = idx;
7718         return skb->len;
7719 }
7720
7721 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7722 {
7723         const struct nlattr * const *nla = cb->data;
7724         struct nft_obj_filter *filter = NULL;
7725
7726         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7727                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7728                 if (!filter)
7729                         return -ENOMEM;
7730
7731                 if (nla[NFTA_OBJ_TABLE]) {
7732                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7733                         if (!filter->table) {
7734                                 kfree(filter);
7735                                 return -ENOMEM;
7736                         }
7737                 }
7738
7739                 if (nla[NFTA_OBJ_TYPE])
7740                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7741         }
7742
7743         cb->data = filter;
7744         return 0;
7745 }
7746
7747 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7748 {
7749         struct nft_obj_filter *filter = cb->data;
7750
7751         if (filter) {
7752                 kfree(filter->table);
7753                 kfree(filter);
7754         }
7755
7756         return 0;
7757 }
7758
7759 /* called with rcu_read_lock held */
7760 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7761                             const struct nlattr * const nla[])
7762 {
7763         struct netlink_ext_ack *extack = info->extack;
7764         u8 genmask = nft_genmask_cur(info->net);
7765         u8 family = info->nfmsg->nfgen_family;
7766         const struct nft_table *table;
7767         struct net *net = info->net;
7768         struct nft_object *obj;
7769         struct sk_buff *skb2;
7770         bool reset = false;
7771         u32 objtype;
7772         int err;
7773
7774         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7775                 struct netlink_dump_control c = {
7776                         .start = nf_tables_dump_obj_start,
7777                         .dump = nf_tables_dump_obj,
7778                         .done = nf_tables_dump_obj_done,
7779                         .module = THIS_MODULE,
7780                         .data = (void *)nla,
7781                 };
7782
7783                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7784         }
7785
7786         if (!nla[NFTA_OBJ_NAME] ||
7787             !nla[NFTA_OBJ_TYPE])
7788                 return -EINVAL;
7789
7790         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7791         if (IS_ERR(table)) {
7792                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7793                 return PTR_ERR(table);
7794         }
7795
7796         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7797         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7798         if (IS_ERR(obj)) {
7799                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7800                 return PTR_ERR(obj);
7801         }
7802
7803         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7804         if (!skb2)
7805                 return -ENOMEM;
7806
7807         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7808                 reset = true;
7809
7810         if (reset) {
7811                 const struct nftables_pernet *nft_net;
7812                 char *buf;
7813
7814                 nft_net = nft_pernet(net);
7815                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7816
7817                 audit_log_nfcfg(buf,
7818                                 family,
7819                                 1,
7820                                 AUDIT_NFT_OP_OBJ_RESET,
7821                                 GFP_ATOMIC);
7822                 kfree(buf);
7823         }
7824
7825         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7826                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7827                                       family, table, obj, reset);
7828         if (err < 0)
7829                 goto err_fill_obj_info;
7830
7831         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7832
7833 err_fill_obj_info:
7834         kfree_skb(skb2);
7835         return err;
7836 }
7837
7838 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7839 {
7840         if (obj->ops->destroy)
7841                 obj->ops->destroy(ctx, obj);
7842
7843         module_put(obj->ops->type->owner);
7844         kfree(obj->key.name);
7845         kfree(obj->udata);
7846         kfree(obj);
7847 }
7848
7849 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7850                             const struct nlattr * const nla[])
7851 {
7852         struct netlink_ext_ack *extack = info->extack;
7853         u8 genmask = nft_genmask_next(info->net);
7854         u8 family = info->nfmsg->nfgen_family;
7855         struct net *net = info->net;
7856         const struct nlattr *attr;
7857         struct nft_table *table;
7858         struct nft_object *obj;
7859         struct nft_ctx ctx;
7860         u32 objtype;
7861
7862         if (!nla[NFTA_OBJ_TYPE] ||
7863             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7864                 return -EINVAL;
7865
7866         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7867                                  NETLINK_CB(skb).portid);
7868         if (IS_ERR(table)) {
7869                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7870                 return PTR_ERR(table);
7871         }
7872
7873         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7874         if (nla[NFTA_OBJ_HANDLE]) {
7875                 attr = nla[NFTA_OBJ_HANDLE];
7876                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7877         } else {
7878                 attr = nla[NFTA_OBJ_NAME];
7879                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7880         }
7881
7882         if (IS_ERR(obj)) {
7883                 if (PTR_ERR(obj) == -ENOENT &&
7884                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7885                         return 0;
7886
7887                 NL_SET_BAD_ATTR(extack, attr);
7888                 return PTR_ERR(obj);
7889         }
7890         if (obj->use > 0) {
7891                 NL_SET_BAD_ATTR(extack, attr);
7892                 return -EBUSY;
7893         }
7894
7895         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7896
7897         return nft_delobj(&ctx, obj);
7898 }
7899
7900 static void
7901 __nft_obj_notify(struct net *net, const struct nft_table *table,
7902                  struct nft_object *obj, u32 portid, u32 seq, int event,
7903                  u16 flags, int family, int report, gfp_t gfp)
7904 {
7905         struct nftables_pernet *nft_net = nft_pernet(net);
7906         struct sk_buff *skb;
7907         int err;
7908
7909         if (!report &&
7910             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7911                 return;
7912
7913         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7914         if (skb == NULL)
7915                 goto err;
7916
7917         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7918                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7919                                       family, table, obj, false);
7920         if (err < 0) {
7921                 kfree_skb(skb);
7922                 goto err;
7923         }
7924
7925         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7926         return;
7927 err:
7928         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7929 }
7930
7931 void nft_obj_notify(struct net *net, const struct nft_table *table,
7932                     struct nft_object *obj, u32 portid, u32 seq, int event,
7933                     u16 flags, int family, int report, gfp_t gfp)
7934 {
7935         struct nftables_pernet *nft_net = nft_pernet(net);
7936         char *buf = kasprintf(gfp, "%s:%u",
7937                               table->name, nft_net->base_seq);
7938
7939         audit_log_nfcfg(buf,
7940                         family,
7941                         obj->handle,
7942                         event == NFT_MSG_NEWOBJ ?
7943                                  AUDIT_NFT_OP_OBJ_REGISTER :
7944                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7945                         gfp);
7946         kfree(buf);
7947
7948         __nft_obj_notify(net, table, obj, portid, seq, event,
7949                          flags, family, report, gfp);
7950 }
7951 EXPORT_SYMBOL_GPL(nft_obj_notify);
7952
7953 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7954                                  struct nft_object *obj, int event)
7955 {
7956         __nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
7957                          ctx->seq, event, ctx->flags, ctx->family,
7958                          ctx->report, GFP_KERNEL);
7959 }
7960
7961 /*
7962  * Flow tables
7963  */
7964 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7965 {
7966         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7967         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7968         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7969 }
7970 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7971
7972 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7973 {
7974         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7975         list_del_rcu(&type->list);
7976         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7977 }
7978 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7979
7980 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7981         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7982                                             .len = NFT_NAME_MAXLEN - 1 },
7983         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7984                                             .len = NFT_NAME_MAXLEN - 1 },
7985         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7986         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7987         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7988 };
7989
7990 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7991                                            const struct nlattr *nla, u8 genmask)
7992 {
7993         struct nft_flowtable *flowtable;
7994
7995         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7996                 if (!nla_strcmp(nla, flowtable->name) &&
7997                     nft_active_genmask(flowtable, genmask))
7998                         return flowtable;
7999         }
8000         return ERR_PTR(-ENOENT);
8001 }
8002 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
8003
8004 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
8005                                     struct nft_flowtable *flowtable,
8006                                     enum nft_trans_phase phase)
8007 {
8008         switch (phase) {
8009         case NFT_TRANS_PREPARE_ERROR:
8010         case NFT_TRANS_PREPARE:
8011         case NFT_TRANS_ABORT:
8012         case NFT_TRANS_RELEASE:
8013                 nft_use_dec(&flowtable->use);
8014                 fallthrough;
8015         default:
8016                 return;
8017         }
8018 }
8019 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
8020
8021 static struct nft_flowtable *
8022 nft_flowtable_lookup_byhandle(const struct nft_table *table,
8023                               const struct nlattr *nla, u8 genmask)
8024 {
8025        struct nft_flowtable *flowtable;
8026
8027        list_for_each_entry(flowtable, &table->flowtables, list) {
8028                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
8029                    nft_active_genmask(flowtable, genmask))
8030                        return flowtable;
8031        }
8032        return ERR_PTR(-ENOENT);
8033 }
8034
8035 struct nft_flowtable_hook {
8036         u32                     num;
8037         int                     priority;
8038         struct list_head        list;
8039 };
8040
8041 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
8042         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
8043         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
8044         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
8045 };
8046
8047 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
8048                                     const struct nlattr * const nla[],
8049                                     struct nft_flowtable_hook *flowtable_hook,
8050                                     struct nft_flowtable *flowtable,
8051                                     struct netlink_ext_ack *extack, bool add)
8052 {
8053         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
8054         struct nft_hook *hook;
8055         int hooknum, priority;
8056         int err;
8057
8058         INIT_LIST_HEAD(&flowtable_hook->list);
8059
8060         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
8061                                           nla[NFTA_FLOWTABLE_HOOK],
8062                                           nft_flowtable_hook_policy, NULL);
8063         if (err < 0)
8064                 return err;
8065
8066         if (add) {
8067                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
8068                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8069                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8070                         return -ENOENT;
8071                 }
8072
8073                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8074                 if (hooknum != NF_NETDEV_INGRESS)
8075                         return -EOPNOTSUPP;
8076
8077                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8078
8079                 flowtable_hook->priority        = priority;
8080                 flowtable_hook->num             = hooknum;
8081         } else {
8082                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8083                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8084                         if (hooknum != flowtable->hooknum)
8085                                 return -EOPNOTSUPP;
8086                 }
8087
8088                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8089                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8090                         if (priority != flowtable->data.priority)
8091                                 return -EOPNOTSUPP;
8092                 }
8093
8094                 flowtable_hook->priority        = flowtable->data.priority;
8095                 flowtable_hook->num             = flowtable->hooknum;
8096         }
8097
8098         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8099                 err = nf_tables_parse_netdev_hooks(ctx->net,
8100                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
8101                                                    &flowtable_hook->list,
8102                                                    extack);
8103                 if (err < 0)
8104                         return err;
8105         }
8106
8107         list_for_each_entry(hook, &flowtable_hook->list, list) {
8108                 hook->ops.pf            = NFPROTO_NETDEV;
8109                 hook->ops.hooknum       = flowtable_hook->num;
8110                 hook->ops.priority      = flowtable_hook->priority;
8111                 hook->ops.priv          = &flowtable->data;
8112                 hook->ops.hook          = flowtable->data.type->hook;
8113         }
8114
8115         return err;
8116 }
8117
8118 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8119 {
8120         const struct nf_flowtable_type *type;
8121
8122         list_for_each_entry(type, &nf_tables_flowtables, list) {
8123                 if (family == type->family)
8124                         return type;
8125         }
8126         return NULL;
8127 }
8128
8129 static const struct nf_flowtable_type *
8130 nft_flowtable_type_get(struct net *net, u8 family)
8131 {
8132         const struct nf_flowtable_type *type;
8133
8134         type = __nft_flowtable_type_get(family);
8135         if (type != NULL && try_module_get(type->owner))
8136                 return type;
8137
8138         lockdep_nfnl_nft_mutex_not_held();
8139 #ifdef CONFIG_MODULES
8140         if (type == NULL) {
8141                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8142                         return ERR_PTR(-EAGAIN);
8143         }
8144 #endif
8145         return ERR_PTR(-ENOENT);
8146 }
8147
8148 /* Only called from error and netdev event paths. */
8149 static void nft_unregister_flowtable_hook(struct net *net,
8150                                           struct nft_flowtable *flowtable,
8151                                           struct nft_hook *hook)
8152 {
8153         nf_unregister_net_hook(net, &hook->ops);
8154         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8155                                     FLOW_BLOCK_UNBIND);
8156 }
8157
8158 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8159                                                  struct list_head *hook_list,
8160                                                  bool release_netdev)
8161 {
8162         struct nft_hook *hook, *next;
8163
8164         list_for_each_entry_safe(hook, next, hook_list, list) {
8165                 nf_unregister_net_hook(net, &hook->ops);
8166                 if (release_netdev) {
8167                         list_del(&hook->list);
8168                         kfree_rcu(hook, rcu);
8169                 }
8170         }
8171 }
8172
8173 static void nft_unregister_flowtable_net_hooks(struct net *net,
8174                                                struct list_head *hook_list)
8175 {
8176         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8177 }
8178
8179 static int nft_register_flowtable_net_hooks(struct net *net,
8180                                             struct nft_table *table,
8181                                             struct list_head *hook_list,
8182                                             struct nft_flowtable *flowtable)
8183 {
8184         struct nft_hook *hook, *hook2, *next;
8185         struct nft_flowtable *ft;
8186         int err, i = 0;
8187
8188         list_for_each_entry(hook, hook_list, list) {
8189                 list_for_each_entry(ft, &table->flowtables, list) {
8190                         if (!nft_is_active_next(net, ft))
8191                                 continue;
8192
8193                         list_for_each_entry(hook2, &ft->hook_list, list) {
8194                                 if (hook->ops.dev == hook2->ops.dev &&
8195                                     hook->ops.pf == hook2->ops.pf) {
8196                                         err = -EEXIST;
8197                                         goto err_unregister_net_hooks;
8198                                 }
8199                         }
8200                 }
8201
8202                 err = flowtable->data.type->setup(&flowtable->data,
8203                                                   hook->ops.dev,
8204                                                   FLOW_BLOCK_BIND);
8205                 if (err < 0)
8206                         goto err_unregister_net_hooks;
8207
8208                 err = nf_register_net_hook(net, &hook->ops);
8209                 if (err < 0) {
8210                         flowtable->data.type->setup(&flowtable->data,
8211                                                     hook->ops.dev,
8212                                                     FLOW_BLOCK_UNBIND);
8213                         goto err_unregister_net_hooks;
8214                 }
8215
8216                 i++;
8217         }
8218
8219         return 0;
8220
8221 err_unregister_net_hooks:
8222         list_for_each_entry_safe(hook, next, hook_list, list) {
8223                 if (i-- <= 0)
8224                         break;
8225
8226                 nft_unregister_flowtable_hook(net, flowtable, hook);
8227                 list_del_rcu(&hook->list);
8228                 kfree_rcu(hook, rcu);
8229         }
8230
8231         return err;
8232 }
8233
8234 static void nft_hooks_destroy(struct list_head *hook_list)
8235 {
8236         struct nft_hook *hook, *next;
8237
8238         list_for_each_entry_safe(hook, next, hook_list, list) {
8239                 list_del_rcu(&hook->list);
8240                 kfree_rcu(hook, rcu);
8241         }
8242 }
8243
8244 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8245                                 struct nft_flowtable *flowtable,
8246                                 struct netlink_ext_ack *extack)
8247 {
8248         const struct nlattr * const *nla = ctx->nla;
8249         struct nft_flowtable_hook flowtable_hook;
8250         struct nft_hook *hook, *next;
8251         struct nft_trans *trans;
8252         bool unregister = false;
8253         u32 flags;
8254         int err;
8255
8256         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8257                                        extack, false);
8258         if (err < 0)
8259                 return err;
8260
8261         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8262                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8263                         list_del(&hook->list);
8264                         kfree(hook);
8265                 }
8266         }
8267
8268         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8269                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8270                 if (flags & ~NFT_FLOWTABLE_MASK) {
8271                         err = -EOPNOTSUPP;
8272                         goto err_flowtable_update_hook;
8273                 }
8274                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8275                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8276                         err = -EOPNOTSUPP;
8277                         goto err_flowtable_update_hook;
8278                 }
8279         } else {
8280                 flags = flowtable->data.flags;
8281         }
8282
8283         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8284                                                &flowtable_hook.list, flowtable);
8285         if (err < 0)
8286                 goto err_flowtable_update_hook;
8287
8288         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8289                                 sizeof(struct nft_trans_flowtable));
8290         if (!trans) {
8291                 unregister = true;
8292                 err = -ENOMEM;
8293                 goto err_flowtable_update_hook;
8294         }
8295
8296         nft_trans_flowtable_flags(trans) = flags;
8297         nft_trans_flowtable(trans) = flowtable;
8298         nft_trans_flowtable_update(trans) = true;
8299         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8300         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8301
8302         nft_trans_commit_list_add_tail(ctx->net, trans);
8303
8304         return 0;
8305
8306 err_flowtable_update_hook:
8307         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8308                 if (unregister)
8309                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8310                 list_del_rcu(&hook->list);
8311                 kfree_rcu(hook, rcu);
8312         }
8313
8314         return err;
8315
8316 }
8317
8318 static int nf_tables_newflowtable(struct sk_buff *skb,
8319                                   const struct nfnl_info *info,
8320                                   const struct nlattr * const nla[])
8321 {
8322         struct netlink_ext_ack *extack = info->extack;
8323         struct nft_flowtable_hook flowtable_hook;
8324         u8 genmask = nft_genmask_next(info->net);
8325         u8 family = info->nfmsg->nfgen_family;
8326         const struct nf_flowtable_type *type;
8327         struct nft_flowtable *flowtable;
8328         struct nft_hook *hook, *next;
8329         struct net *net = info->net;
8330         struct nft_table *table;
8331         struct nft_ctx ctx;
8332         int err;
8333
8334         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8335             !nla[NFTA_FLOWTABLE_NAME] ||
8336             !nla[NFTA_FLOWTABLE_HOOK])
8337                 return -EINVAL;
8338
8339         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8340                                  genmask, NETLINK_CB(skb).portid);
8341         if (IS_ERR(table)) {
8342                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8343                 return PTR_ERR(table);
8344         }
8345
8346         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8347                                          genmask);
8348         if (IS_ERR(flowtable)) {
8349                 err = PTR_ERR(flowtable);
8350                 if (err != -ENOENT) {
8351                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8352                         return err;
8353                 }
8354         } else {
8355                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8356                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8357                         return -EEXIST;
8358                 }
8359
8360                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8361
8362                 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8363         }
8364
8365         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8366
8367         if (!nft_use_inc(&table->use))
8368                 return -EMFILE;
8369
8370         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8371         if (!flowtable) {
8372                 err = -ENOMEM;
8373                 goto flowtable_alloc;
8374         }
8375
8376         flowtable->table = table;
8377         flowtable->handle = nf_tables_alloc_handle(table);
8378         INIT_LIST_HEAD(&flowtable->hook_list);
8379
8380         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8381         if (!flowtable->name) {
8382                 err = -ENOMEM;
8383                 goto err1;
8384         }
8385
8386         type = nft_flowtable_type_get(net, family);
8387         if (IS_ERR(type)) {
8388                 err = PTR_ERR(type);
8389                 goto err2;
8390         }
8391
8392         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8393                 flowtable->data.flags =
8394                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8395                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8396                         err = -EOPNOTSUPP;
8397                         goto err3;
8398                 }
8399         }
8400
8401         write_pnet(&flowtable->data.net, net);
8402         flowtable->data.type = type;
8403         err = type->init(&flowtable->data);
8404         if (err < 0)
8405                 goto err3;
8406
8407         err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8408                                        extack, true);
8409         if (err < 0)
8410                 goto err4;
8411
8412         list_splice(&flowtable_hook.list, &flowtable->hook_list);
8413         flowtable->data.priority = flowtable_hook.priority;
8414         flowtable->hooknum = flowtable_hook.num;
8415
8416         err = nft_register_flowtable_net_hooks(ctx.net, table,
8417                                                &flowtable->hook_list,
8418                                                flowtable);
8419         if (err < 0) {
8420                 nft_hooks_destroy(&flowtable->hook_list);
8421                 goto err4;
8422         }
8423
8424         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8425         if (err < 0)
8426                 goto err5;
8427
8428         list_add_tail_rcu(&flowtable->list, &table->flowtables);
8429
8430         return 0;
8431 err5:
8432         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8433                 nft_unregister_flowtable_hook(net, flowtable, hook);
8434                 list_del_rcu(&hook->list);
8435                 kfree_rcu(hook, rcu);
8436         }
8437 err4:
8438         flowtable->data.type->free(&flowtable->data);
8439 err3:
8440         module_put(type->owner);
8441 err2:
8442         kfree(flowtable->name);
8443 err1:
8444         kfree(flowtable);
8445 flowtable_alloc:
8446         nft_use_dec_restore(&table->use);
8447
8448         return err;
8449 }
8450
8451 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8452 {
8453         struct nft_hook *this, *next;
8454
8455         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8456                 list_del(&this->list);
8457                 kfree(this);
8458         }
8459 }
8460
8461 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8462                                  struct nft_flowtable *flowtable,
8463                                  struct netlink_ext_ack *extack)
8464 {
8465         const struct nlattr * const *nla = ctx->nla;
8466         struct nft_flowtable_hook flowtable_hook;
8467         LIST_HEAD(flowtable_del_list);
8468         struct nft_hook *this, *hook;
8469         struct nft_trans *trans;
8470         int err;
8471
8472         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8473                                        extack, false);
8474         if (err < 0)
8475                 return err;
8476
8477         list_for_each_entry(this, &flowtable_hook.list, list) {
8478                 hook = nft_hook_list_find(&flowtable->hook_list, this);
8479                 if (!hook) {
8480                         err = -ENOENT;
8481                         goto err_flowtable_del_hook;
8482                 }
8483                 list_move(&hook->list, &flowtable_del_list);
8484         }
8485
8486         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8487                                 sizeof(struct nft_trans_flowtable));
8488         if (!trans) {
8489                 err = -ENOMEM;
8490                 goto err_flowtable_del_hook;
8491         }
8492
8493         nft_trans_flowtable(trans) = flowtable;
8494         nft_trans_flowtable_update(trans) = true;
8495         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8496         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8497         nft_flowtable_hook_release(&flowtable_hook);
8498
8499         nft_trans_commit_list_add_tail(ctx->net, trans);
8500
8501         return 0;
8502
8503 err_flowtable_del_hook:
8504         list_splice(&flowtable_del_list, &flowtable->hook_list);
8505         nft_flowtable_hook_release(&flowtable_hook);
8506
8507         return err;
8508 }
8509
8510 static int nf_tables_delflowtable(struct sk_buff *skb,
8511                                   const struct nfnl_info *info,
8512                                   const struct nlattr * const nla[])
8513 {
8514         struct netlink_ext_ack *extack = info->extack;
8515         u8 genmask = nft_genmask_next(info->net);
8516         u8 family = info->nfmsg->nfgen_family;
8517         struct nft_flowtable *flowtable;
8518         struct net *net = info->net;
8519         const struct nlattr *attr;
8520         struct nft_table *table;
8521         struct nft_ctx ctx;
8522
8523         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8524             (!nla[NFTA_FLOWTABLE_NAME] &&
8525              !nla[NFTA_FLOWTABLE_HANDLE]))
8526                 return -EINVAL;
8527
8528         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8529                                  genmask, NETLINK_CB(skb).portid);
8530         if (IS_ERR(table)) {
8531                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8532                 return PTR_ERR(table);
8533         }
8534
8535         if (nla[NFTA_FLOWTABLE_HANDLE]) {
8536                 attr = nla[NFTA_FLOWTABLE_HANDLE];
8537                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8538         } else {
8539                 attr = nla[NFTA_FLOWTABLE_NAME];
8540                 flowtable = nft_flowtable_lookup(table, attr, genmask);
8541         }
8542
8543         if (IS_ERR(flowtable)) {
8544                 if (PTR_ERR(flowtable) == -ENOENT &&
8545                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8546                         return 0;
8547
8548                 NL_SET_BAD_ATTR(extack, attr);
8549                 return PTR_ERR(flowtable);
8550         }
8551
8552         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8553
8554         if (nla[NFTA_FLOWTABLE_HOOK])
8555                 return nft_delflowtable_hook(&ctx, flowtable, extack);
8556
8557         if (flowtable->use > 0) {
8558                 NL_SET_BAD_ATTR(extack, attr);
8559                 return -EBUSY;
8560         }
8561
8562         return nft_delflowtable(&ctx, flowtable);
8563 }
8564
8565 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8566                                          u32 portid, u32 seq, int event,
8567                                          u32 flags, int family,
8568                                          struct nft_flowtable *flowtable,
8569                                          struct list_head *hook_list)
8570 {
8571         struct nlattr *nest, *nest_devs;
8572         struct nft_hook *hook;
8573         struct nlmsghdr *nlh;
8574
8575         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8576         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8577                            NFNETLINK_V0, nft_base_seq(net));
8578         if (!nlh)
8579                 goto nla_put_failure;
8580
8581         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8582             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8583             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8584                          NFTA_FLOWTABLE_PAD))
8585                 goto nla_put_failure;
8586
8587         if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8588                 nlmsg_end(skb, nlh);
8589                 return 0;
8590         }
8591
8592         if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8593             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8594                 goto nla_put_failure;
8595
8596         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8597         if (!nest)
8598                 goto nla_put_failure;
8599         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8600             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8601                 goto nla_put_failure;
8602
8603         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8604         if (!nest_devs)
8605                 goto nla_put_failure;
8606
8607         if (!hook_list)
8608                 hook_list = &flowtable->hook_list;
8609
8610         list_for_each_entry_rcu(hook, hook_list, list) {
8611                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8612                         goto nla_put_failure;
8613         }
8614         nla_nest_end(skb, nest_devs);
8615         nla_nest_end(skb, nest);
8616
8617         nlmsg_end(skb, nlh);
8618         return 0;
8619
8620 nla_put_failure:
8621         nlmsg_trim(skb, nlh);
8622         return -1;
8623 }
8624
8625 struct nft_flowtable_filter {
8626         char            *table;
8627 };
8628
8629 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8630                                     struct netlink_callback *cb)
8631 {
8632         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8633         struct nft_flowtable_filter *filter = cb->data;
8634         unsigned int idx = 0, s_idx = cb->args[0];
8635         struct net *net = sock_net(skb->sk);
8636         int family = nfmsg->nfgen_family;
8637         struct nft_flowtable *flowtable;
8638         struct nftables_pernet *nft_net;
8639         const struct nft_table *table;
8640
8641         rcu_read_lock();
8642         nft_net = nft_pernet(net);
8643         cb->seq = READ_ONCE(nft_net->base_seq);
8644
8645         list_for_each_entry_rcu(table, &nft_net->tables, list) {
8646                 if (family != NFPROTO_UNSPEC && family != table->family)
8647                         continue;
8648
8649                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8650                         if (!nft_is_active(net, flowtable))
8651                                 goto cont;
8652                         if (idx < s_idx)
8653                                 goto cont;
8654                         if (idx > s_idx)
8655                                 memset(&cb->args[1], 0,
8656                                        sizeof(cb->args) - sizeof(cb->args[0]));
8657                         if (filter && filter->table &&
8658                             strcmp(filter->table, table->name))
8659                                 goto cont;
8660
8661                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8662                                                           cb->nlh->nlmsg_seq,
8663                                                           NFT_MSG_NEWFLOWTABLE,
8664                                                           NLM_F_MULTI | NLM_F_APPEND,
8665                                                           table->family,
8666                                                           flowtable, NULL) < 0)
8667                                 goto done;
8668
8669                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8670 cont:
8671                         idx++;
8672                 }
8673         }
8674 done:
8675         rcu_read_unlock();
8676
8677         cb->args[0] = idx;
8678         return skb->len;
8679 }
8680
8681 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8682 {
8683         const struct nlattr * const *nla = cb->data;
8684         struct nft_flowtable_filter *filter = NULL;
8685
8686         if (nla[NFTA_FLOWTABLE_TABLE]) {
8687                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8688                 if (!filter)
8689                         return -ENOMEM;
8690
8691                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8692                                            GFP_ATOMIC);
8693                 if (!filter->table) {
8694                         kfree(filter);
8695                         return -ENOMEM;
8696                 }
8697         }
8698
8699         cb->data = filter;
8700         return 0;
8701 }
8702
8703 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8704 {
8705         struct nft_flowtable_filter *filter = cb->data;
8706
8707         if (!filter)
8708                 return 0;
8709
8710         kfree(filter->table);
8711         kfree(filter);
8712
8713         return 0;
8714 }
8715
8716 /* called with rcu_read_lock held */
8717 static int nf_tables_getflowtable(struct sk_buff *skb,
8718                                   const struct nfnl_info *info,
8719                                   const struct nlattr * const nla[])
8720 {
8721         u8 genmask = nft_genmask_cur(info->net);
8722         u8 family = info->nfmsg->nfgen_family;
8723         struct nft_flowtable *flowtable;
8724         const struct nft_table *table;
8725         struct net *net = info->net;
8726         struct sk_buff *skb2;
8727         int err;
8728
8729         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8730                 struct netlink_dump_control c = {
8731                         .start = nf_tables_dump_flowtable_start,
8732                         .dump = nf_tables_dump_flowtable,
8733                         .done = nf_tables_dump_flowtable_done,
8734                         .module = THIS_MODULE,
8735                         .data = (void *)nla,
8736                 };
8737
8738                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8739         }
8740
8741         if (!nla[NFTA_FLOWTABLE_NAME])
8742                 return -EINVAL;
8743
8744         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8745                                  genmask, 0);
8746         if (IS_ERR(table))
8747                 return PTR_ERR(table);
8748
8749         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8750                                          genmask);
8751         if (IS_ERR(flowtable))
8752                 return PTR_ERR(flowtable);
8753
8754         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8755         if (!skb2)
8756                 return -ENOMEM;
8757
8758         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8759                                             info->nlh->nlmsg_seq,
8760                                             NFT_MSG_NEWFLOWTABLE, 0, family,
8761                                             flowtable, NULL);
8762         if (err < 0)
8763                 goto err_fill_flowtable_info;
8764
8765         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8766
8767 err_fill_flowtable_info:
8768         kfree_skb(skb2);
8769         return err;
8770 }
8771
8772 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8773                                        struct nft_flowtable *flowtable,
8774                                        struct list_head *hook_list, int event)
8775 {
8776         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8777         struct sk_buff *skb;
8778         u16 flags = 0;
8779         int err;
8780
8781         if (!ctx->report &&
8782             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8783                 return;
8784
8785         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8786         if (skb == NULL)
8787                 goto err;
8788
8789         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8790                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8791
8792         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8793                                             ctx->seq, event, flags,
8794                                             ctx->family, flowtable, hook_list);
8795         if (err < 0) {
8796                 kfree_skb(skb);
8797                 goto err;
8798         }
8799
8800         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8801         return;
8802 err:
8803         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8804 }
8805
8806 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8807 {
8808         struct nft_hook *hook, *next;
8809
8810         flowtable->data.type->free(&flowtable->data);
8811         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8812                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8813                                             FLOW_BLOCK_UNBIND);
8814                 list_del_rcu(&hook->list);
8815                 kfree(hook);
8816         }
8817         kfree(flowtable->name);
8818         module_put(flowtable->data.type->owner);
8819         kfree(flowtable);
8820 }
8821
8822 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8823                                    u32 portid, u32 seq)
8824 {
8825         struct nftables_pernet *nft_net = nft_pernet(net);
8826         struct nlmsghdr *nlh;
8827         char buf[TASK_COMM_LEN];
8828         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8829
8830         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8831                            NFNETLINK_V0, nft_base_seq(net));
8832         if (!nlh)
8833                 goto nla_put_failure;
8834
8835         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8836             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8837             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8838                 goto nla_put_failure;
8839
8840         nlmsg_end(skb, nlh);
8841         return 0;
8842
8843 nla_put_failure:
8844         nlmsg_trim(skb, nlh);
8845         return -EMSGSIZE;
8846 }
8847
8848 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8849                                 struct nft_flowtable *flowtable)
8850 {
8851         struct nft_hook *hook;
8852
8853         list_for_each_entry(hook, &flowtable->hook_list, list) {
8854                 if (hook->ops.dev != dev)
8855                         continue;
8856
8857                 /* flow_offload_netdev_event() cleans up entries for us. */
8858                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8859                 list_del_rcu(&hook->list);
8860                 kfree_rcu(hook, rcu);
8861                 break;
8862         }
8863 }
8864
8865 static int nf_tables_flowtable_event(struct notifier_block *this,
8866                                      unsigned long event, void *ptr)
8867 {
8868         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8869         struct nft_flowtable *flowtable;
8870         struct nftables_pernet *nft_net;
8871         struct nft_table *table;
8872         struct net *net;
8873
8874         if (event != NETDEV_UNREGISTER)
8875                 return 0;
8876
8877         net = dev_net(dev);
8878         nft_net = nft_pernet(net);
8879         mutex_lock(&nft_net->commit_mutex);
8880         list_for_each_entry(table, &nft_net->tables, list) {
8881                 list_for_each_entry(flowtable, &table->flowtables, list) {
8882                         nft_flowtable_event(event, dev, flowtable);
8883                 }
8884         }
8885         mutex_unlock(&nft_net->commit_mutex);
8886
8887         return NOTIFY_DONE;
8888 }
8889
8890 static struct notifier_block nf_tables_flowtable_notifier = {
8891         .notifier_call  = nf_tables_flowtable_event,
8892 };
8893
8894 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8895                                  int event)
8896 {
8897         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8898         struct sk_buff *skb2;
8899         int err;
8900
8901         if (!nlmsg_report(nlh) &&
8902             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8903                 return;
8904
8905         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8906         if (skb2 == NULL)
8907                 goto err;
8908
8909         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8910                                       nlh->nlmsg_seq);
8911         if (err < 0) {
8912                 kfree_skb(skb2);
8913                 goto err;
8914         }
8915
8916         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8917                        nlmsg_report(nlh), GFP_KERNEL);
8918         return;
8919 err:
8920         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8921                           -ENOBUFS);
8922 }
8923
8924 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8925                             const struct nlattr * const nla[])
8926 {
8927         struct sk_buff *skb2;
8928         int err;
8929
8930         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8931         if (skb2 == NULL)
8932                 return -ENOMEM;
8933
8934         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8935                                       info->nlh->nlmsg_seq);
8936         if (err < 0)
8937                 goto err_fill_gen_info;
8938
8939         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8940
8941 err_fill_gen_info:
8942         kfree_skb(skb2);
8943         return err;
8944 }
8945
8946 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8947         [NFT_MSG_NEWTABLE] = {
8948                 .call           = nf_tables_newtable,
8949                 .type           = NFNL_CB_BATCH,
8950                 .attr_count     = NFTA_TABLE_MAX,
8951                 .policy         = nft_table_policy,
8952         },
8953         [NFT_MSG_GETTABLE] = {
8954                 .call           = nf_tables_gettable,
8955                 .type           = NFNL_CB_RCU,
8956                 .attr_count     = NFTA_TABLE_MAX,
8957                 .policy         = nft_table_policy,
8958         },
8959         [NFT_MSG_DELTABLE] = {
8960                 .call           = nf_tables_deltable,
8961                 .type           = NFNL_CB_BATCH,
8962                 .attr_count     = NFTA_TABLE_MAX,
8963                 .policy         = nft_table_policy,
8964         },
8965         [NFT_MSG_DESTROYTABLE] = {
8966                 .call           = nf_tables_deltable,
8967                 .type           = NFNL_CB_BATCH,
8968                 .attr_count     = NFTA_TABLE_MAX,
8969                 .policy         = nft_table_policy,
8970         },
8971         [NFT_MSG_NEWCHAIN] = {
8972                 .call           = nf_tables_newchain,
8973                 .type           = NFNL_CB_BATCH,
8974                 .attr_count     = NFTA_CHAIN_MAX,
8975                 .policy         = nft_chain_policy,
8976         },
8977         [NFT_MSG_GETCHAIN] = {
8978                 .call           = nf_tables_getchain,
8979                 .type           = NFNL_CB_RCU,
8980                 .attr_count     = NFTA_CHAIN_MAX,
8981                 .policy         = nft_chain_policy,
8982         },
8983         [NFT_MSG_DELCHAIN] = {
8984                 .call           = nf_tables_delchain,
8985                 .type           = NFNL_CB_BATCH,
8986                 .attr_count     = NFTA_CHAIN_MAX,
8987                 .policy         = nft_chain_policy,
8988         },
8989         [NFT_MSG_DESTROYCHAIN] = {
8990                 .call           = nf_tables_delchain,
8991                 .type           = NFNL_CB_BATCH,
8992                 .attr_count     = NFTA_CHAIN_MAX,
8993                 .policy         = nft_chain_policy,
8994         },
8995         [NFT_MSG_NEWRULE] = {
8996                 .call           = nf_tables_newrule,
8997                 .type           = NFNL_CB_BATCH,
8998                 .attr_count     = NFTA_RULE_MAX,
8999                 .policy         = nft_rule_policy,
9000         },
9001         [NFT_MSG_GETRULE] = {
9002                 .call           = nf_tables_getrule,
9003                 .type           = NFNL_CB_RCU,
9004                 .attr_count     = NFTA_RULE_MAX,
9005                 .policy         = nft_rule_policy,
9006         },
9007         [NFT_MSG_GETRULE_RESET] = {
9008                 .call           = nf_tables_getrule,
9009                 .type           = NFNL_CB_RCU,
9010                 .attr_count     = NFTA_RULE_MAX,
9011                 .policy         = nft_rule_policy,
9012         },
9013         [NFT_MSG_DELRULE] = {
9014                 .call           = nf_tables_delrule,
9015                 .type           = NFNL_CB_BATCH,
9016                 .attr_count     = NFTA_RULE_MAX,
9017                 .policy         = nft_rule_policy,
9018         },
9019         [NFT_MSG_DESTROYRULE] = {
9020                 .call           = nf_tables_delrule,
9021                 .type           = NFNL_CB_BATCH,
9022                 .attr_count     = NFTA_RULE_MAX,
9023                 .policy         = nft_rule_policy,
9024         },
9025         [NFT_MSG_NEWSET] = {
9026                 .call           = nf_tables_newset,
9027                 .type           = NFNL_CB_BATCH,
9028                 .attr_count     = NFTA_SET_MAX,
9029                 .policy         = nft_set_policy,
9030         },
9031         [NFT_MSG_GETSET] = {
9032                 .call           = nf_tables_getset,
9033                 .type           = NFNL_CB_RCU,
9034                 .attr_count     = NFTA_SET_MAX,
9035                 .policy         = nft_set_policy,
9036         },
9037         [NFT_MSG_DELSET] = {
9038                 .call           = nf_tables_delset,
9039                 .type           = NFNL_CB_BATCH,
9040                 .attr_count     = NFTA_SET_MAX,
9041                 .policy         = nft_set_policy,
9042         },
9043         [NFT_MSG_DESTROYSET] = {
9044                 .call           = nf_tables_delset,
9045                 .type           = NFNL_CB_BATCH,
9046                 .attr_count     = NFTA_SET_MAX,
9047                 .policy         = nft_set_policy,
9048         },
9049         [NFT_MSG_NEWSETELEM] = {
9050                 .call           = nf_tables_newsetelem,
9051                 .type           = NFNL_CB_BATCH,
9052                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9053                 .policy         = nft_set_elem_list_policy,
9054         },
9055         [NFT_MSG_GETSETELEM] = {
9056                 .call           = nf_tables_getsetelem,
9057                 .type           = NFNL_CB_RCU,
9058                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9059                 .policy         = nft_set_elem_list_policy,
9060         },
9061         [NFT_MSG_GETSETELEM_RESET] = {
9062                 .call           = nf_tables_getsetelem,
9063                 .type           = NFNL_CB_RCU,
9064                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9065                 .policy         = nft_set_elem_list_policy,
9066         },
9067         [NFT_MSG_DELSETELEM] = {
9068                 .call           = nf_tables_delsetelem,
9069                 .type           = NFNL_CB_BATCH,
9070                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9071                 .policy         = nft_set_elem_list_policy,
9072         },
9073         [NFT_MSG_DESTROYSETELEM] = {
9074                 .call           = nf_tables_delsetelem,
9075                 .type           = NFNL_CB_BATCH,
9076                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9077                 .policy         = nft_set_elem_list_policy,
9078         },
9079         [NFT_MSG_GETGEN] = {
9080                 .call           = nf_tables_getgen,
9081                 .type           = NFNL_CB_RCU,
9082         },
9083         [NFT_MSG_NEWOBJ] = {
9084                 .call           = nf_tables_newobj,
9085                 .type           = NFNL_CB_BATCH,
9086                 .attr_count     = NFTA_OBJ_MAX,
9087                 .policy         = nft_obj_policy,
9088         },
9089         [NFT_MSG_GETOBJ] = {
9090                 .call           = nf_tables_getobj,
9091                 .type           = NFNL_CB_RCU,
9092                 .attr_count     = NFTA_OBJ_MAX,
9093                 .policy         = nft_obj_policy,
9094         },
9095         [NFT_MSG_DELOBJ] = {
9096                 .call           = nf_tables_delobj,
9097                 .type           = NFNL_CB_BATCH,
9098                 .attr_count     = NFTA_OBJ_MAX,
9099                 .policy         = nft_obj_policy,
9100         },
9101         [NFT_MSG_DESTROYOBJ] = {
9102                 .call           = nf_tables_delobj,
9103                 .type           = NFNL_CB_BATCH,
9104                 .attr_count     = NFTA_OBJ_MAX,
9105                 .policy         = nft_obj_policy,
9106         },
9107         [NFT_MSG_GETOBJ_RESET] = {
9108                 .call           = nf_tables_getobj,
9109                 .type           = NFNL_CB_RCU,
9110                 .attr_count     = NFTA_OBJ_MAX,
9111                 .policy         = nft_obj_policy,
9112         },
9113         [NFT_MSG_NEWFLOWTABLE] = {
9114                 .call           = nf_tables_newflowtable,
9115                 .type           = NFNL_CB_BATCH,
9116                 .attr_count     = NFTA_FLOWTABLE_MAX,
9117                 .policy         = nft_flowtable_policy,
9118         },
9119         [NFT_MSG_GETFLOWTABLE] = {
9120                 .call           = nf_tables_getflowtable,
9121                 .type           = NFNL_CB_RCU,
9122                 .attr_count     = NFTA_FLOWTABLE_MAX,
9123                 .policy         = nft_flowtable_policy,
9124         },
9125         [NFT_MSG_DELFLOWTABLE] = {
9126                 .call           = nf_tables_delflowtable,
9127                 .type           = NFNL_CB_BATCH,
9128                 .attr_count     = NFTA_FLOWTABLE_MAX,
9129                 .policy         = nft_flowtable_policy,
9130         },
9131         [NFT_MSG_DESTROYFLOWTABLE] = {
9132                 .call           = nf_tables_delflowtable,
9133                 .type           = NFNL_CB_BATCH,
9134                 .attr_count     = NFTA_FLOWTABLE_MAX,
9135                 .policy         = nft_flowtable_policy,
9136         },
9137 };
9138
9139 static int nf_tables_validate(struct net *net)
9140 {
9141         struct nftables_pernet *nft_net = nft_pernet(net);
9142         struct nft_table *table;
9143
9144         list_for_each_entry(table, &nft_net->tables, list) {
9145                 switch (table->validate_state) {
9146                 case NFT_VALIDATE_SKIP:
9147                         continue;
9148                 case NFT_VALIDATE_NEED:
9149                         nft_validate_state_update(table, NFT_VALIDATE_DO);
9150                         fallthrough;
9151                 case NFT_VALIDATE_DO:
9152                         if (nft_table_validate(net, table) < 0)
9153                                 return -EAGAIN;
9154
9155                         nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9156                         break;
9157                 }
9158         }
9159
9160         return 0;
9161 }
9162
9163 /* a drop policy has to be deferred until all rules have been activated,
9164  * otherwise a large ruleset that contains a drop-policy base chain will
9165  * cause all packets to get dropped until the full transaction has been
9166  * processed.
9167  *
9168  * We defer the drop policy until the transaction has been finalized.
9169  */
9170 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9171 {
9172         struct nft_base_chain *basechain;
9173
9174         if (nft_trans_chain_policy(trans) != NF_DROP)
9175                 return;
9176
9177         if (!nft_is_base_chain(trans->ctx.chain))
9178                 return;
9179
9180         basechain = nft_base_chain(trans->ctx.chain);
9181         basechain->policy = NF_DROP;
9182 }
9183
9184 static void nft_chain_commit_update(struct nft_trans *trans)
9185 {
9186         struct nft_base_chain *basechain;
9187
9188         if (nft_trans_chain_name(trans)) {
9189                 rhltable_remove(&trans->ctx.table->chains_ht,
9190                                 &trans->ctx.chain->rhlhead,
9191                                 nft_chain_ht_params);
9192                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9193                 rhltable_insert_key(&trans->ctx.table->chains_ht,
9194                                     trans->ctx.chain->name,
9195                                     &trans->ctx.chain->rhlhead,
9196                                     nft_chain_ht_params);
9197         }
9198
9199         if (!nft_is_base_chain(trans->ctx.chain))
9200                 return;
9201
9202         nft_chain_stats_replace(trans);
9203
9204         basechain = nft_base_chain(trans->ctx.chain);
9205
9206         switch (nft_trans_chain_policy(trans)) {
9207         case NF_DROP:
9208         case NF_ACCEPT:
9209                 basechain->policy = nft_trans_chain_policy(trans);
9210                 break;
9211         }
9212 }
9213
9214 static void nft_obj_commit_update(struct nft_trans *trans)
9215 {
9216         struct nft_object *newobj;
9217         struct nft_object *obj;
9218
9219         obj = nft_trans_obj(trans);
9220         newobj = nft_trans_obj_newobj(trans);
9221
9222         if (obj->ops->update)
9223                 obj->ops->update(obj, newobj);
9224
9225         nft_obj_destroy(&trans->ctx, newobj);
9226 }
9227
9228 static void nft_commit_release(struct nft_trans *trans)
9229 {
9230         switch (trans->msg_type) {
9231         case NFT_MSG_DELTABLE:
9232         case NFT_MSG_DESTROYTABLE:
9233                 nf_tables_table_destroy(&trans->ctx);
9234                 break;
9235         case NFT_MSG_NEWCHAIN:
9236                 free_percpu(nft_trans_chain_stats(trans));
9237                 kfree(nft_trans_chain_name(trans));
9238                 break;
9239         case NFT_MSG_DELCHAIN:
9240         case NFT_MSG_DESTROYCHAIN:
9241                 if (nft_trans_chain_update(trans))
9242                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9243                 else
9244                         nf_tables_chain_destroy(&trans->ctx);
9245                 break;
9246         case NFT_MSG_DELRULE:
9247         case NFT_MSG_DESTROYRULE:
9248                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9249                 break;
9250         case NFT_MSG_DELSET:
9251         case NFT_MSG_DESTROYSET:
9252                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9253                 break;
9254         case NFT_MSG_DELSETELEM:
9255         case NFT_MSG_DESTROYSETELEM:
9256                 nf_tables_set_elem_destroy(&trans->ctx,
9257                                            nft_trans_elem_set(trans),
9258                                            nft_trans_elem(trans).priv);
9259                 break;
9260         case NFT_MSG_DELOBJ:
9261         case NFT_MSG_DESTROYOBJ:
9262                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9263                 break;
9264         case NFT_MSG_DELFLOWTABLE:
9265         case NFT_MSG_DESTROYFLOWTABLE:
9266                 if (nft_trans_flowtable_update(trans))
9267                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9268                 else
9269                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9270                 break;
9271         }
9272
9273         if (trans->put_net)
9274                 put_net(trans->ctx.net);
9275
9276         kfree(trans);
9277 }
9278
9279 static void nf_tables_trans_destroy_work(struct work_struct *w)
9280 {
9281         struct nft_trans *trans, *next;
9282         LIST_HEAD(head);
9283
9284         spin_lock(&nf_tables_destroy_list_lock);
9285         list_splice_init(&nf_tables_destroy_list, &head);
9286         spin_unlock(&nf_tables_destroy_list_lock);
9287
9288         if (list_empty(&head))
9289                 return;
9290
9291         synchronize_rcu();
9292
9293         list_for_each_entry_safe(trans, next, &head, list) {
9294                 nft_trans_list_del(trans);
9295                 nft_commit_release(trans);
9296         }
9297 }
9298
9299 void nf_tables_trans_destroy_flush_work(void)
9300 {
9301         flush_work(&trans_destroy_work);
9302 }
9303 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9304
9305 static bool nft_expr_reduce(struct nft_regs_track *track,
9306                             const struct nft_expr *expr)
9307 {
9308         return false;
9309 }
9310
9311 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9312 {
9313         const struct nft_expr *expr, *last;
9314         struct nft_regs_track track = {};
9315         unsigned int size, data_size;
9316         void *data, *data_boundary;
9317         struct nft_rule_dp *prule;
9318         struct nft_rule *rule;
9319
9320         /* already handled or inactive chain? */
9321         if (chain->blob_next || !nft_is_active_next(net, chain))
9322                 return 0;
9323
9324         data_size = 0;
9325         list_for_each_entry(rule, &chain->rules, list) {
9326                 if (nft_is_active_next(net, rule)) {
9327                         data_size += sizeof(*prule) + rule->dlen;
9328                         if (data_size > INT_MAX)
9329                                 return -ENOMEM;
9330                 }
9331         }
9332
9333         chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9334         if (!chain->blob_next)
9335                 return -ENOMEM;
9336
9337         data = (void *)chain->blob_next->data;
9338         data_boundary = data + data_size;
9339         size = 0;
9340
9341         list_for_each_entry(rule, &chain->rules, list) {
9342                 if (!nft_is_active_next(net, rule))
9343                         continue;
9344
9345                 prule = (struct nft_rule_dp *)data;
9346                 data += offsetof(struct nft_rule_dp, data);
9347                 if (WARN_ON_ONCE(data > data_boundary))
9348                         return -ENOMEM;
9349
9350                 size = 0;
9351                 track.last = nft_expr_last(rule);
9352                 nft_rule_for_each_expr(expr, last, rule) {
9353                         track.cur = expr;
9354
9355                         if (nft_expr_reduce(&track, expr)) {
9356                                 expr = track.cur;
9357                                 continue;
9358                         }
9359
9360                         if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9361                                 return -ENOMEM;
9362
9363                         memcpy(data + size, expr, expr->ops->size);
9364                         size += expr->ops->size;
9365                 }
9366                 if (WARN_ON_ONCE(size >= 1 << 12))
9367                         return -ENOMEM;
9368
9369                 prule->handle = rule->handle;
9370                 prule->dlen = size;
9371                 prule->is_last = 0;
9372
9373                 data += size;
9374                 size = 0;
9375                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9376         }
9377
9378         if (WARN_ON_ONCE(data > data_boundary))
9379                 return -ENOMEM;
9380
9381         prule = (struct nft_rule_dp *)data;
9382         nft_last_rule(chain, prule);
9383
9384         return 0;
9385 }
9386
9387 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9388 {
9389         struct nftables_pernet *nft_net = nft_pernet(net);
9390         struct nft_trans *trans, *next;
9391
9392         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9393                 struct nft_chain *chain = trans->ctx.chain;
9394
9395                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9396                     trans->msg_type == NFT_MSG_DELRULE) {
9397                         kvfree(chain->blob_next);
9398                         chain->blob_next = NULL;
9399                 }
9400         }
9401 }
9402
9403 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9404 {
9405         struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9406
9407         kvfree(l->blob);
9408 }
9409
9410 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9411 {
9412         struct nft_rule_dp_last *last;
9413
9414         /* last rule trailer is after end marker */
9415         last = (void *)blob + sizeof(*blob) + blob->size;
9416         last->blob = blob;
9417
9418         call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9419 }
9420
9421 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9422 {
9423         struct nft_rule_blob *g0, *g1;
9424         bool next_genbit;
9425
9426         next_genbit = nft_gencursor_next(net);
9427
9428         g0 = rcu_dereference_protected(chain->blob_gen_0,
9429                                        lockdep_commit_lock_is_held(net));
9430         g1 = rcu_dereference_protected(chain->blob_gen_1,
9431                                        lockdep_commit_lock_is_held(net));
9432
9433         /* No changes to this chain? */
9434         if (chain->blob_next == NULL) {
9435                 /* chain had no change in last or next generation */
9436                 if (g0 == g1)
9437                         return;
9438                 /*
9439                  * chain had no change in this generation; make sure next
9440                  * one uses same rules as current generation.
9441                  */
9442                 if (next_genbit) {
9443                         rcu_assign_pointer(chain->blob_gen_1, g0);
9444                         nf_tables_commit_chain_free_rules_old(g1);
9445                 } else {
9446                         rcu_assign_pointer(chain->blob_gen_0, g1);
9447                         nf_tables_commit_chain_free_rules_old(g0);
9448                 }
9449
9450                 return;
9451         }
9452
9453         if (next_genbit)
9454                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9455         else
9456                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9457
9458         chain->blob_next = NULL;
9459
9460         if (g0 == g1)
9461                 return;
9462
9463         if (next_genbit)
9464                 nf_tables_commit_chain_free_rules_old(g1);
9465         else
9466                 nf_tables_commit_chain_free_rules_old(g0);
9467 }
9468
9469 static void nft_obj_del(struct nft_object *obj)
9470 {
9471         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9472         list_del_rcu(&obj->list);
9473 }
9474
9475 void nft_chain_del(struct nft_chain *chain)
9476 {
9477         struct nft_table *table = chain->table;
9478
9479         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9480                                      nft_chain_ht_params));
9481         list_del_rcu(&chain->list);
9482 }
9483
9484 static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
9485                                         struct nft_trans_gc *trans)
9486 {
9487         void **priv = trans->priv;
9488         unsigned int i;
9489
9490         for (i = 0; i < trans->count; i++) {
9491                 struct nft_set_elem elem = {
9492                         .priv = priv[i],
9493                 };
9494
9495                 nft_setelem_data_deactivate(ctx->net, trans->set, &elem);
9496                 nft_setelem_remove(ctx->net, trans->set, &elem);
9497         }
9498 }
9499
9500 void nft_trans_gc_destroy(struct nft_trans_gc *trans)
9501 {
9502         nft_set_put(trans->set);
9503         put_net(trans->net);
9504         kfree(trans);
9505 }
9506
9507 static void nft_trans_gc_trans_free(struct rcu_head *rcu)
9508 {
9509         struct nft_set_elem elem = {};
9510         struct nft_trans_gc *trans;
9511         struct nft_ctx ctx = {};
9512         unsigned int i;
9513
9514         trans = container_of(rcu, struct nft_trans_gc, rcu);
9515         ctx.net = read_pnet(&trans->set->net);
9516
9517         for (i = 0; i < trans->count; i++) {
9518                 elem.priv = trans->priv[i];
9519                 if (!nft_setelem_is_catchall(trans->set, &elem))
9520                         atomic_dec(&trans->set->nelems);
9521
9522                 nf_tables_set_elem_destroy(&ctx, trans->set, elem.priv);
9523         }
9524
9525         nft_trans_gc_destroy(trans);
9526 }
9527
9528 static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
9529 {
9530         struct nftables_pernet *nft_net;
9531         struct nft_ctx ctx = {};
9532
9533         nft_net = nft_pernet(trans->net);
9534
9535         mutex_lock(&nft_net->commit_mutex);
9536
9537         /* Check for race with transaction, otherwise this batch refers to
9538          * stale objects that might not be there anymore. Skip transaction if
9539          * set has been destroyed from control plane transaction in case gc
9540          * worker loses race.
9541          */
9542         if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
9543                 mutex_unlock(&nft_net->commit_mutex);
9544                 return false;
9545         }
9546
9547         ctx.net = trans->net;
9548         ctx.table = trans->set->table;
9549
9550         nft_trans_gc_setelem_remove(&ctx, trans);
9551         mutex_unlock(&nft_net->commit_mutex);
9552
9553         return true;
9554 }
9555
9556 static void nft_trans_gc_work(struct work_struct *work)
9557 {
9558         struct nft_trans_gc *trans, *next;
9559         LIST_HEAD(trans_gc_list);
9560
9561         spin_lock(&nf_tables_gc_list_lock);
9562         list_splice_init(&nf_tables_gc_list, &trans_gc_list);
9563         spin_unlock(&nf_tables_gc_list_lock);
9564
9565         list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
9566                 list_del(&trans->list);
9567                 if (!nft_trans_gc_work_done(trans)) {
9568                         nft_trans_gc_destroy(trans);
9569                         continue;
9570                 }
9571                 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9572         }
9573 }
9574
9575 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
9576                                         unsigned int gc_seq, gfp_t gfp)
9577 {
9578         struct net *net = read_pnet(&set->net);
9579         struct nft_trans_gc *trans;
9580
9581         trans = kzalloc(sizeof(*trans), gfp);
9582         if (!trans)
9583                 return NULL;
9584
9585         trans->net = maybe_get_net(net);
9586         if (!trans->net) {
9587                 kfree(trans);
9588                 return NULL;
9589         }
9590
9591         refcount_inc(&set->refs);
9592         trans->set = set;
9593         trans->seq = gc_seq;
9594
9595         return trans;
9596 }
9597
9598 void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
9599 {
9600         trans->priv[trans->count++] = priv;
9601 }
9602
9603 static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
9604 {
9605         spin_lock(&nf_tables_gc_list_lock);
9606         list_add_tail(&trans->list, &nf_tables_gc_list);
9607         spin_unlock(&nf_tables_gc_list_lock);
9608
9609         schedule_work(&trans_gc_work);
9610 }
9611
9612 static int nft_trans_gc_space(struct nft_trans_gc *trans)
9613 {
9614         return NFT_TRANS_GC_BATCHCOUNT - trans->count;
9615 }
9616
9617 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
9618                                               unsigned int gc_seq, gfp_t gfp)
9619 {
9620         struct nft_set *set;
9621
9622         if (nft_trans_gc_space(gc))
9623                 return gc;
9624
9625         set = gc->set;
9626         nft_trans_gc_queue_work(gc);
9627
9628         return nft_trans_gc_alloc(set, gc_seq, gfp);
9629 }
9630
9631 void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
9632 {
9633         if (trans->count == 0) {
9634                 nft_trans_gc_destroy(trans);
9635                 return;
9636         }
9637
9638         nft_trans_gc_queue_work(trans);
9639 }
9640
9641 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
9642 {
9643         struct nft_set *set;
9644
9645         if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
9646                 return NULL;
9647
9648         if (nft_trans_gc_space(gc))
9649                 return gc;
9650
9651         set = gc->set;
9652         call_rcu(&gc->rcu, nft_trans_gc_trans_free);
9653
9654         return nft_trans_gc_alloc(set, 0, gfp);
9655 }
9656
9657 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
9658 {
9659         WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
9660
9661         if (trans->count == 0) {
9662                 nft_trans_gc_destroy(trans);
9663                 return;
9664         }
9665
9666         call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9667 }
9668
9669 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
9670                                                  unsigned int gc_seq)
9671 {
9672         struct nft_set_elem_catchall *catchall;
9673         const struct nft_set *set = gc->set;
9674         struct nft_set_ext *ext;
9675
9676         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9677                 ext = nft_set_elem_ext(set, catchall->elem);
9678
9679                 if (!nft_set_elem_expired(ext))
9680                         continue;
9681                 if (nft_set_elem_is_dead(ext))
9682                         goto dead_elem;
9683
9684                 nft_set_elem_dead(ext);
9685 dead_elem:
9686                 gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
9687                 if (!gc)
9688                         return NULL;
9689
9690                 nft_trans_gc_elem_add(gc, catchall->elem);
9691         }
9692
9693         return gc;
9694 }
9695
9696 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc)
9697 {
9698         struct nft_set_elem_catchall *catchall, *next;
9699         const struct nft_set *set = gc->set;
9700         struct nft_set_elem elem;
9701         struct nft_set_ext *ext;
9702
9703         WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net));
9704
9705         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
9706                 ext = nft_set_elem_ext(set, catchall->elem);
9707
9708                 if (!nft_set_elem_expired(ext))
9709                         continue;
9710
9711                 gc = nft_trans_gc_queue_sync(gc, GFP_KERNEL);
9712                 if (!gc)
9713                         return NULL;
9714
9715                 memset(&elem, 0, sizeof(elem));
9716                 elem.priv = catchall->elem;
9717
9718                 nft_setelem_data_deactivate(gc->net, gc->set, &elem);
9719                 nft_setelem_catchall_destroy(catchall);
9720                 nft_trans_gc_elem_add(gc, elem.priv);
9721         }
9722
9723         return gc;
9724 }
9725
9726 static void nf_tables_module_autoload_cleanup(struct net *net)
9727 {
9728         struct nftables_pernet *nft_net = nft_pernet(net);
9729         struct nft_module_request *req, *next;
9730
9731         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9732         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9733                 WARN_ON_ONCE(!req->done);
9734                 list_del(&req->list);
9735                 kfree(req);
9736         }
9737 }
9738
9739 static void nf_tables_commit_release(struct net *net)
9740 {
9741         struct nftables_pernet *nft_net = nft_pernet(net);
9742         struct nft_trans *trans;
9743
9744         /* all side effects have to be made visible.
9745          * For example, if a chain named 'foo' has been deleted, a
9746          * new transaction must not find it anymore.
9747          *
9748          * Memory reclaim happens asynchronously from work queue
9749          * to prevent expensive synchronize_rcu() in commit phase.
9750          */
9751         if (list_empty(&nft_net->commit_list)) {
9752                 nf_tables_module_autoload_cleanup(net);
9753                 mutex_unlock(&nft_net->commit_mutex);
9754                 return;
9755         }
9756
9757         trans = list_last_entry(&nft_net->commit_list,
9758                                 struct nft_trans, list);
9759         get_net(trans->ctx.net);
9760         WARN_ON_ONCE(trans->put_net);
9761
9762         trans->put_net = true;
9763         spin_lock(&nf_tables_destroy_list_lock);
9764         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9765         spin_unlock(&nf_tables_destroy_list_lock);
9766
9767         nf_tables_module_autoload_cleanup(net);
9768         schedule_work(&trans_destroy_work);
9769
9770         mutex_unlock(&nft_net->commit_mutex);
9771 }
9772
9773 static void nft_commit_notify(struct net *net, u32 portid)
9774 {
9775         struct nftables_pernet *nft_net = nft_pernet(net);
9776         struct sk_buff *batch_skb = NULL, *nskb, *skb;
9777         unsigned char *data;
9778         int len;
9779
9780         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9781                 if (!batch_skb) {
9782 new_batch:
9783                         batch_skb = skb;
9784                         len = NLMSG_GOODSIZE - skb->len;
9785                         list_del(&skb->list);
9786                         continue;
9787                 }
9788                 len -= skb->len;
9789                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9790                         data = skb_put(batch_skb, skb->len);
9791                         memcpy(data, skb->data, skb->len);
9792                         list_del(&skb->list);
9793                         kfree_skb(skb);
9794                         continue;
9795                 }
9796                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9797                                NFT_CB(batch_skb).report, GFP_KERNEL);
9798                 goto new_batch;
9799         }
9800
9801         if (batch_skb) {
9802                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9803                                NFT_CB(batch_skb).report, GFP_KERNEL);
9804         }
9805
9806         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9807 }
9808
9809 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9810                                         struct nft_table *table)
9811 {
9812         struct nft_audit_data *adp;
9813
9814         list_for_each_entry(adp, adl, list) {
9815                 if (adp->table == table)
9816                         return 0;
9817         }
9818         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9819         if (!adp)
9820                 return -ENOMEM;
9821         adp->table = table;
9822         list_add(&adp->list, adl);
9823         return 0;
9824 }
9825
9826 static void nf_tables_commit_audit_free(struct list_head *adl)
9827 {
9828         struct nft_audit_data *adp, *adn;
9829
9830         list_for_each_entry_safe(adp, adn, adl, list) {
9831                 list_del(&adp->list);
9832                 kfree(adp);
9833         }
9834 }
9835
9836 static void nf_tables_commit_audit_collect(struct list_head *adl,
9837                                            struct nft_table *table, u32 op)
9838 {
9839         struct nft_audit_data *adp;
9840
9841         list_for_each_entry(adp, adl, list) {
9842                 if (adp->table == table)
9843                         goto found;
9844         }
9845         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9846         return;
9847 found:
9848         adp->entries++;
9849         if (!adp->op || adp->op > op)
9850                 adp->op = op;
9851 }
9852
9853 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9854
9855 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9856 {
9857         struct nft_audit_data *adp, *adn;
9858         char aubuf[AUNFTABLENAMELEN];
9859
9860         list_for_each_entry_safe(adp, adn, adl, list) {
9861                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9862                          generation);
9863                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9864                                 nft2audit_op[adp->op], GFP_KERNEL);
9865                 list_del(&adp->list);
9866                 kfree(adp);
9867         }
9868 }
9869
9870 static void nft_set_commit_update(struct list_head *set_update_list)
9871 {
9872         struct nft_set *set, *next;
9873
9874         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9875                 list_del_init(&set->pending_update);
9876
9877                 if (!set->ops->commit || set->dead)
9878                         continue;
9879
9880                 set->ops->commit(set);
9881         }
9882 }
9883
9884 static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
9885 {
9886         unsigned int gc_seq;
9887
9888         /* Bump gc counter, it becomes odd, this is the busy mark. */
9889         gc_seq = READ_ONCE(nft_net->gc_seq);
9890         WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9891
9892         return gc_seq;
9893 }
9894
9895 static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
9896 {
9897         WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9898 }
9899
9900 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9901 {
9902         struct nftables_pernet *nft_net = nft_pernet(net);
9903         struct nft_trans *trans, *next;
9904         unsigned int base_seq, gc_seq;
9905         LIST_HEAD(set_update_list);
9906         struct nft_trans_elem *te;
9907         struct nft_chain *chain;
9908         struct nft_table *table;
9909         LIST_HEAD(adl);
9910         int err;
9911
9912         if (list_empty(&nft_net->commit_list)) {
9913                 mutex_unlock(&nft_net->commit_mutex);
9914                 return 0;
9915         }
9916
9917         list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
9918                 switch (trans->msg_type) {
9919                 case NFT_MSG_NEWSET:
9920                         if (!nft_trans_set_update(trans) &&
9921                             nft_set_is_anonymous(nft_trans_set(trans)) &&
9922                             !nft_trans_set_bound(trans)) {
9923                                 pr_warn_once("nftables ruleset with unbound set\n");
9924                                 return -EINVAL;
9925                         }
9926                         break;
9927                 case NFT_MSG_NEWCHAIN:
9928                         if (!nft_trans_chain_update(trans) &&
9929                             nft_chain_binding(nft_trans_chain(trans)) &&
9930                             !nft_trans_chain_bound(trans)) {
9931                                 pr_warn_once("nftables ruleset with unbound chain\n");
9932                                 return -EINVAL;
9933                         }
9934                         break;
9935                 }
9936         }
9937
9938         /* 0. Validate ruleset, otherwise roll back for error reporting. */
9939         if (nf_tables_validate(net) < 0) {
9940                 nft_net->validate_state = NFT_VALIDATE_DO;
9941                 return -EAGAIN;
9942         }
9943
9944         err = nft_flow_rule_offload_commit(net);
9945         if (err < 0)
9946                 return err;
9947
9948         /* 1.  Allocate space for next generation rules_gen_X[] */
9949         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9950                 int ret;
9951
9952                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9953                 if (ret) {
9954                         nf_tables_commit_chain_prepare_cancel(net);
9955                         nf_tables_commit_audit_free(&adl);
9956                         return ret;
9957                 }
9958                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9959                     trans->msg_type == NFT_MSG_DELRULE) {
9960                         chain = trans->ctx.chain;
9961
9962                         ret = nf_tables_commit_chain_prepare(net, chain);
9963                         if (ret < 0) {
9964                                 nf_tables_commit_chain_prepare_cancel(net);
9965                                 nf_tables_commit_audit_free(&adl);
9966                                 return ret;
9967                         }
9968                 }
9969         }
9970
9971         /* step 2.  Make rules_gen_X visible to packet path */
9972         list_for_each_entry(table, &nft_net->tables, list) {
9973                 list_for_each_entry(chain, &table->chains, list)
9974                         nf_tables_commit_chain(net, chain);
9975         }
9976
9977         /*
9978          * Bump generation counter, invalidate any dump in progress.
9979          * Cannot fail after this point.
9980          */
9981         base_seq = READ_ONCE(nft_net->base_seq);
9982         while (++base_seq == 0)
9983                 ;
9984
9985         WRITE_ONCE(nft_net->base_seq, base_seq);
9986
9987         gc_seq = nft_gc_seq_begin(nft_net);
9988
9989         /* step 3. Start new generation, rules_gen_X now in use. */
9990         net->nft.gencursor = nft_gencursor_next(net);
9991
9992         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9993                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9994                                                trans->msg_type);
9995                 switch (trans->msg_type) {
9996                 case NFT_MSG_NEWTABLE:
9997                         if (nft_trans_table_update(trans)) {
9998                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9999                                         nft_trans_destroy(trans);
10000                                         break;
10001                                 }
10002                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
10003                                         nf_tables_table_disable(net, trans->ctx.table);
10004
10005                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10006                         } else {
10007                                 nft_clear(net, trans->ctx.table);
10008                         }
10009                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
10010                         nft_trans_destroy(trans);
10011                         break;
10012                 case NFT_MSG_DELTABLE:
10013                 case NFT_MSG_DESTROYTABLE:
10014                         list_del_rcu(&trans->ctx.table->list);
10015                         nf_tables_table_notify(&trans->ctx, trans->msg_type);
10016                         break;
10017                 case NFT_MSG_NEWCHAIN:
10018                         if (nft_trans_chain_update(trans)) {
10019                                 nft_chain_commit_update(trans);
10020                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
10021                                                        &nft_trans_chain_hooks(trans));
10022                                 list_splice(&nft_trans_chain_hooks(trans),
10023                                             &nft_trans_basechain(trans)->hook_list);
10024                                 /* trans destroyed after rcu grace period */
10025                         } else {
10026                                 nft_chain_commit_drop_policy(trans);
10027                                 nft_clear(net, trans->ctx.chain);
10028                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
10029                                 nft_trans_destroy(trans);
10030                         }
10031                         break;
10032                 case NFT_MSG_DELCHAIN:
10033                 case NFT_MSG_DESTROYCHAIN:
10034                         if (nft_trans_chain_update(trans)) {
10035                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10036                                                        &nft_trans_chain_hooks(trans));
10037                                 nft_netdev_unregister_hooks(net,
10038                                                             &nft_trans_chain_hooks(trans),
10039                                                             true);
10040                         } else {
10041                                 nft_chain_del(trans->ctx.chain);
10042                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10043                                                        NULL);
10044                                 nf_tables_unregister_hook(trans->ctx.net,
10045                                                           trans->ctx.table,
10046                                                           trans->ctx.chain);
10047                         }
10048                         break;
10049                 case NFT_MSG_NEWRULE:
10050                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
10051                         nf_tables_rule_notify(&trans->ctx,
10052                                               nft_trans_rule(trans),
10053                                               NFT_MSG_NEWRULE);
10054                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10055                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10056
10057                         nft_trans_destroy(trans);
10058                         break;
10059                 case NFT_MSG_DELRULE:
10060                 case NFT_MSG_DESTROYRULE:
10061                         list_del_rcu(&nft_trans_rule(trans)->list);
10062                         nf_tables_rule_notify(&trans->ctx,
10063                                               nft_trans_rule(trans),
10064                                               trans->msg_type);
10065                         nft_rule_expr_deactivate(&trans->ctx,
10066                                                  nft_trans_rule(trans),
10067                                                  NFT_TRANS_COMMIT);
10068
10069                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10070                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10071                         break;
10072                 case NFT_MSG_NEWSET:
10073                         if (nft_trans_set_update(trans)) {
10074                                 struct nft_set *set = nft_trans_set(trans);
10075
10076                                 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
10077                                 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
10078
10079                                 if (nft_trans_set_size(trans))
10080                                         WRITE_ONCE(set->size, nft_trans_set_size(trans));
10081                         } else {
10082                                 nft_clear(net, nft_trans_set(trans));
10083                                 /* This avoids hitting -EBUSY when deleting the table
10084                                  * from the transaction.
10085                                  */
10086                                 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
10087                                     !list_empty(&nft_trans_set(trans)->bindings))
10088                                         nft_use_dec(&trans->ctx.table->use);
10089                         }
10090                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10091                                              NFT_MSG_NEWSET, GFP_KERNEL);
10092                         nft_trans_destroy(trans);
10093                         break;
10094                 case NFT_MSG_DELSET:
10095                 case NFT_MSG_DESTROYSET:
10096                         nft_trans_set(trans)->dead = 1;
10097                         list_del_rcu(&nft_trans_set(trans)->list);
10098                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10099                                              trans->msg_type, GFP_KERNEL);
10100                         break;
10101                 case NFT_MSG_NEWSETELEM:
10102                         te = (struct nft_trans_elem *)trans->data;
10103
10104                         nft_setelem_activate(net, te->set, &te->elem);
10105                         nf_tables_setelem_notify(&trans->ctx, te->set,
10106                                                  &te->elem,
10107                                                  NFT_MSG_NEWSETELEM);
10108                         if (te->set->ops->commit &&
10109                             list_empty(&te->set->pending_update)) {
10110                                 list_add_tail(&te->set->pending_update,
10111                                               &set_update_list);
10112                         }
10113                         nft_trans_destroy(trans);
10114                         break;
10115                 case NFT_MSG_DELSETELEM:
10116                 case NFT_MSG_DESTROYSETELEM:
10117                         te = (struct nft_trans_elem *)trans->data;
10118
10119                         nf_tables_setelem_notify(&trans->ctx, te->set,
10120                                                  &te->elem,
10121                                                  trans->msg_type);
10122                         nft_setelem_remove(net, te->set, &te->elem);
10123                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
10124                                 atomic_dec(&te->set->nelems);
10125                                 te->set->ndeact--;
10126                         }
10127                         if (te->set->ops->commit &&
10128                             list_empty(&te->set->pending_update)) {
10129                                 list_add_tail(&te->set->pending_update,
10130                                               &set_update_list);
10131                         }
10132                         break;
10133                 case NFT_MSG_NEWOBJ:
10134                         if (nft_trans_obj_update(trans)) {
10135                                 nft_obj_commit_update(trans);
10136                                 nf_tables_obj_notify(&trans->ctx,
10137                                                      nft_trans_obj(trans),
10138                                                      NFT_MSG_NEWOBJ);
10139                         } else {
10140                                 nft_clear(net, nft_trans_obj(trans));
10141                                 nf_tables_obj_notify(&trans->ctx,
10142                                                      nft_trans_obj(trans),
10143                                                      NFT_MSG_NEWOBJ);
10144                                 nft_trans_destroy(trans);
10145                         }
10146                         break;
10147                 case NFT_MSG_DELOBJ:
10148                 case NFT_MSG_DESTROYOBJ:
10149                         nft_obj_del(nft_trans_obj(trans));
10150                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
10151                                              trans->msg_type);
10152                         break;
10153                 case NFT_MSG_NEWFLOWTABLE:
10154                         if (nft_trans_flowtable_update(trans)) {
10155                                 nft_trans_flowtable(trans)->data.flags =
10156                                         nft_trans_flowtable_flags(trans);
10157                                 nf_tables_flowtable_notify(&trans->ctx,
10158                                                            nft_trans_flowtable(trans),
10159                                                            &nft_trans_flowtable_hooks(trans),
10160                                                            NFT_MSG_NEWFLOWTABLE);
10161                                 list_splice(&nft_trans_flowtable_hooks(trans),
10162                                             &nft_trans_flowtable(trans)->hook_list);
10163                         } else {
10164                                 nft_clear(net, nft_trans_flowtable(trans));
10165                                 nf_tables_flowtable_notify(&trans->ctx,
10166                                                            nft_trans_flowtable(trans),
10167                                                            NULL,
10168                                                            NFT_MSG_NEWFLOWTABLE);
10169                         }
10170                         nft_trans_destroy(trans);
10171                         break;
10172                 case NFT_MSG_DELFLOWTABLE:
10173                 case NFT_MSG_DESTROYFLOWTABLE:
10174                         if (nft_trans_flowtable_update(trans)) {
10175                                 nf_tables_flowtable_notify(&trans->ctx,
10176                                                            nft_trans_flowtable(trans),
10177                                                            &nft_trans_flowtable_hooks(trans),
10178                                                            trans->msg_type);
10179                                 nft_unregister_flowtable_net_hooks(net,
10180                                                                    &nft_trans_flowtable_hooks(trans));
10181                         } else {
10182                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10183                                 nf_tables_flowtable_notify(&trans->ctx,
10184                                                            nft_trans_flowtable(trans),
10185                                                            NULL,
10186                                                            trans->msg_type);
10187                                 nft_unregister_flowtable_net_hooks(net,
10188                                                 &nft_trans_flowtable(trans)->hook_list);
10189                         }
10190                         break;
10191                 }
10192         }
10193
10194         nft_set_commit_update(&set_update_list);
10195
10196         nft_commit_notify(net, NETLINK_CB(skb).portid);
10197         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
10198         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
10199
10200         nft_gc_seq_end(nft_net, gc_seq);
10201         nft_net->validate_state = NFT_VALIDATE_SKIP;
10202         nf_tables_commit_release(net);
10203
10204         return 0;
10205 }
10206
10207 static void nf_tables_module_autoload(struct net *net)
10208 {
10209         struct nftables_pernet *nft_net = nft_pernet(net);
10210         struct nft_module_request *req, *next;
10211         LIST_HEAD(module_list);
10212
10213         list_splice_init(&nft_net->module_list, &module_list);
10214         mutex_unlock(&nft_net->commit_mutex);
10215         list_for_each_entry_safe(req, next, &module_list, list) {
10216                 request_module("%s", req->module);
10217                 req->done = true;
10218         }
10219         mutex_lock(&nft_net->commit_mutex);
10220         list_splice(&module_list, &nft_net->module_list);
10221 }
10222
10223 static void nf_tables_abort_release(struct nft_trans *trans)
10224 {
10225         switch (trans->msg_type) {
10226         case NFT_MSG_NEWTABLE:
10227                 nf_tables_table_destroy(&trans->ctx);
10228                 break;
10229         case NFT_MSG_NEWCHAIN:
10230                 if (nft_trans_chain_update(trans))
10231                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
10232                 else
10233                         nf_tables_chain_destroy(&trans->ctx);
10234                 break;
10235         case NFT_MSG_NEWRULE:
10236                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
10237                 break;
10238         case NFT_MSG_NEWSET:
10239                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
10240                 break;
10241         case NFT_MSG_NEWSETELEM:
10242                 nft_set_elem_destroy(nft_trans_elem_set(trans),
10243                                      nft_trans_elem(trans).priv, true);
10244                 break;
10245         case NFT_MSG_NEWOBJ:
10246                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
10247                 break;
10248         case NFT_MSG_NEWFLOWTABLE:
10249                 if (nft_trans_flowtable_update(trans))
10250                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
10251                 else
10252                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
10253                 break;
10254         }
10255         kfree(trans);
10256 }
10257
10258 static void nft_set_abort_update(struct list_head *set_update_list)
10259 {
10260         struct nft_set *set, *next;
10261
10262         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10263                 list_del_init(&set->pending_update);
10264
10265                 if (!set->ops->abort)
10266                         continue;
10267
10268                 set->ops->abort(set);
10269         }
10270 }
10271
10272 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
10273 {
10274         struct nftables_pernet *nft_net = nft_pernet(net);
10275         struct nft_trans *trans, *next;
10276         LIST_HEAD(set_update_list);
10277         struct nft_trans_elem *te;
10278
10279         if (action == NFNL_ABORT_VALIDATE &&
10280             nf_tables_validate(net) < 0)
10281                 return -EAGAIN;
10282
10283         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
10284                                          list) {
10285                 switch (trans->msg_type) {
10286                 case NFT_MSG_NEWTABLE:
10287                         if (nft_trans_table_update(trans)) {
10288                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10289                                         nft_trans_destroy(trans);
10290                                         break;
10291                                 }
10292                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
10293                                         nf_tables_table_disable(net, trans->ctx.table);
10294                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
10295                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
10296                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
10297                                 }
10298                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10299                                 nft_trans_destroy(trans);
10300                         } else {
10301                                 list_del_rcu(&trans->ctx.table->list);
10302                         }
10303                         break;
10304                 case NFT_MSG_DELTABLE:
10305                 case NFT_MSG_DESTROYTABLE:
10306                         nft_clear(trans->ctx.net, trans->ctx.table);
10307                         nft_trans_destroy(trans);
10308                         break;
10309                 case NFT_MSG_NEWCHAIN:
10310                         if (nft_trans_chain_update(trans)) {
10311                                 nft_netdev_unregister_hooks(net,
10312                                                             &nft_trans_chain_hooks(trans),
10313                                                             true);
10314                                 free_percpu(nft_trans_chain_stats(trans));
10315                                 kfree(nft_trans_chain_name(trans));
10316                                 nft_trans_destroy(trans);
10317                         } else {
10318                                 if (nft_trans_chain_bound(trans)) {
10319                                         nft_trans_destroy(trans);
10320                                         break;
10321                                 }
10322                                 nft_use_dec_restore(&trans->ctx.table->use);
10323                                 nft_chain_del(trans->ctx.chain);
10324                                 nf_tables_unregister_hook(trans->ctx.net,
10325                                                           trans->ctx.table,
10326                                                           trans->ctx.chain);
10327                         }
10328                         break;
10329                 case NFT_MSG_DELCHAIN:
10330                 case NFT_MSG_DESTROYCHAIN:
10331                         if (nft_trans_chain_update(trans)) {
10332                                 list_splice(&nft_trans_chain_hooks(trans),
10333                                             &nft_trans_basechain(trans)->hook_list);
10334                         } else {
10335                                 nft_use_inc_restore(&trans->ctx.table->use);
10336                                 nft_clear(trans->ctx.net, trans->ctx.chain);
10337                         }
10338                         nft_trans_destroy(trans);
10339                         break;
10340                 case NFT_MSG_NEWRULE:
10341                         if (nft_trans_rule_bound(trans)) {
10342                                 nft_trans_destroy(trans);
10343                                 break;
10344                         }
10345                         nft_use_dec_restore(&trans->ctx.chain->use);
10346                         list_del_rcu(&nft_trans_rule(trans)->list);
10347                         nft_rule_expr_deactivate(&trans->ctx,
10348                                                  nft_trans_rule(trans),
10349                                                  NFT_TRANS_ABORT);
10350                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10351                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10352                         break;
10353                 case NFT_MSG_DELRULE:
10354                 case NFT_MSG_DESTROYRULE:
10355                         nft_use_inc_restore(&trans->ctx.chain->use);
10356                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
10357                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10358                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10359                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10360
10361                         nft_trans_destroy(trans);
10362                         break;
10363                 case NFT_MSG_NEWSET:
10364                         if (nft_trans_set_update(trans)) {
10365                                 nft_trans_destroy(trans);
10366                                 break;
10367                         }
10368                         nft_use_dec_restore(&trans->ctx.table->use);
10369                         if (nft_trans_set_bound(trans)) {
10370                                 nft_trans_destroy(trans);
10371                                 break;
10372                         }
10373                         nft_trans_set(trans)->dead = 1;
10374                         list_del_rcu(&nft_trans_set(trans)->list);
10375                         break;
10376                 case NFT_MSG_DELSET:
10377                 case NFT_MSG_DESTROYSET:
10378                         nft_use_inc_restore(&trans->ctx.table->use);
10379                         nft_clear(trans->ctx.net, nft_trans_set(trans));
10380                         if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10381                                 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10382
10383                         nft_trans_destroy(trans);
10384                         break;
10385                 case NFT_MSG_NEWSETELEM:
10386                         if (nft_trans_elem_set_bound(trans)) {
10387                                 nft_trans_destroy(trans);
10388                                 break;
10389                         }
10390                         te = (struct nft_trans_elem *)trans->data;
10391                         nft_setelem_remove(net, te->set, &te->elem);
10392                         if (!nft_setelem_is_catchall(te->set, &te->elem))
10393                                 atomic_dec(&te->set->nelems);
10394
10395                         if (te->set->ops->abort &&
10396                             list_empty(&te->set->pending_update)) {
10397                                 list_add_tail(&te->set->pending_update,
10398                                               &set_update_list);
10399                         }
10400                         break;
10401                 case NFT_MSG_DELSETELEM:
10402                 case NFT_MSG_DESTROYSETELEM:
10403                         te = (struct nft_trans_elem *)trans->data;
10404
10405                         nft_setelem_data_activate(net, te->set, &te->elem);
10406                         nft_setelem_activate(net, te->set, &te->elem);
10407                         if (!nft_setelem_is_catchall(te->set, &te->elem))
10408                                 te->set->ndeact--;
10409
10410                         if (te->set->ops->abort &&
10411                             list_empty(&te->set->pending_update)) {
10412                                 list_add_tail(&te->set->pending_update,
10413                                               &set_update_list);
10414                         }
10415                         nft_trans_destroy(trans);
10416                         break;
10417                 case NFT_MSG_NEWOBJ:
10418                         if (nft_trans_obj_update(trans)) {
10419                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10420                                 nft_trans_destroy(trans);
10421                         } else {
10422                                 nft_use_dec_restore(&trans->ctx.table->use);
10423                                 nft_obj_del(nft_trans_obj(trans));
10424                         }
10425                         break;
10426                 case NFT_MSG_DELOBJ:
10427                 case NFT_MSG_DESTROYOBJ:
10428                         nft_use_inc_restore(&trans->ctx.table->use);
10429                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
10430                         nft_trans_destroy(trans);
10431                         break;
10432                 case NFT_MSG_NEWFLOWTABLE:
10433                         if (nft_trans_flowtable_update(trans)) {
10434                                 nft_unregister_flowtable_net_hooks(net,
10435                                                 &nft_trans_flowtable_hooks(trans));
10436                         } else {
10437                                 nft_use_dec_restore(&trans->ctx.table->use);
10438                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10439                                 nft_unregister_flowtable_net_hooks(net,
10440                                                 &nft_trans_flowtable(trans)->hook_list);
10441                         }
10442                         break;
10443                 case NFT_MSG_DELFLOWTABLE:
10444                 case NFT_MSG_DESTROYFLOWTABLE:
10445                         if (nft_trans_flowtable_update(trans)) {
10446                                 list_splice(&nft_trans_flowtable_hooks(trans),
10447                                             &nft_trans_flowtable(trans)->hook_list);
10448                         } else {
10449                                 nft_use_inc_restore(&trans->ctx.table->use);
10450                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10451                         }
10452                         nft_trans_destroy(trans);
10453                         break;
10454                 }
10455         }
10456
10457         nft_set_abort_update(&set_update_list);
10458
10459         synchronize_rcu();
10460
10461         list_for_each_entry_safe_reverse(trans, next,
10462                                          &nft_net->commit_list, list) {
10463                 nft_trans_list_del(trans);
10464                 nf_tables_abort_release(trans);
10465         }
10466
10467         if (action == NFNL_ABORT_AUTOLOAD)
10468                 nf_tables_module_autoload(net);
10469         else
10470                 nf_tables_module_autoload_cleanup(net);
10471
10472         return 0;
10473 }
10474
10475 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10476                            enum nfnl_abort_action action)
10477 {
10478         struct nftables_pernet *nft_net = nft_pernet(net);
10479         unsigned int gc_seq;
10480         int ret;
10481
10482         gc_seq = nft_gc_seq_begin(nft_net);
10483         ret = __nf_tables_abort(net, action);
10484         nft_gc_seq_end(nft_net, gc_seq);
10485         mutex_unlock(&nft_net->commit_mutex);
10486
10487         return ret;
10488 }
10489
10490 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10491 {
10492         struct nftables_pernet *nft_net = nft_pernet(net);
10493         bool genid_ok;
10494
10495         mutex_lock(&nft_net->commit_mutex);
10496
10497         genid_ok = genid == 0 || nft_net->base_seq == genid;
10498         if (!genid_ok)
10499                 mutex_unlock(&nft_net->commit_mutex);
10500
10501         /* else, commit mutex has to be released by commit or abort function */
10502         return genid_ok;
10503 }
10504
10505 static const struct nfnetlink_subsystem nf_tables_subsys = {
10506         .name           = "nf_tables",
10507         .subsys_id      = NFNL_SUBSYS_NFTABLES,
10508         .cb_count       = NFT_MSG_MAX,
10509         .cb             = nf_tables_cb,
10510         .commit         = nf_tables_commit,
10511         .abort          = nf_tables_abort,
10512         .valid_genid    = nf_tables_valid_genid,
10513         .owner          = THIS_MODULE,
10514 };
10515
10516 int nft_chain_validate_dependency(const struct nft_chain *chain,
10517                                   enum nft_chain_types type)
10518 {
10519         const struct nft_base_chain *basechain;
10520
10521         if (nft_is_base_chain(chain)) {
10522                 basechain = nft_base_chain(chain);
10523                 if (basechain->type->type != type)
10524                         return -EOPNOTSUPP;
10525         }
10526         return 0;
10527 }
10528 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10529
10530 int nft_chain_validate_hooks(const struct nft_chain *chain,
10531                              unsigned int hook_flags)
10532 {
10533         struct nft_base_chain *basechain;
10534
10535         if (nft_is_base_chain(chain)) {
10536                 basechain = nft_base_chain(chain);
10537
10538                 if ((1 << basechain->ops.hooknum) & hook_flags)
10539                         return 0;
10540
10541                 return -EOPNOTSUPP;
10542         }
10543
10544         return 0;
10545 }
10546 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10547
10548 /*
10549  * Loop detection - walk through the ruleset beginning at the destination chain
10550  * of a new jump until either the source chain is reached (loop) or all
10551  * reachable chains have been traversed.
10552  *
10553  * The loop check is performed whenever a new jump verdict is added to an
10554  * expression or verdict map or a verdict map is bound to a new chain.
10555  */
10556
10557 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10558                                  const struct nft_chain *chain);
10559
10560 static int nft_check_loops(const struct nft_ctx *ctx,
10561                            const struct nft_set_ext *ext)
10562 {
10563         const struct nft_data *data;
10564         int ret;
10565
10566         data = nft_set_ext_data(ext);
10567         switch (data->verdict.code) {
10568         case NFT_JUMP:
10569         case NFT_GOTO:
10570                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10571                 break;
10572         default:
10573                 ret = 0;
10574                 break;
10575         }
10576
10577         return ret;
10578 }
10579
10580 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10581                                         struct nft_set *set,
10582                                         const struct nft_set_iter *iter,
10583                                         struct nft_set_elem *elem)
10584 {
10585         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
10586
10587         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10588             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10589                 return 0;
10590
10591         return nft_check_loops(ctx, ext);
10592 }
10593
10594 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10595                                   struct nft_set *set)
10596 {
10597         u8 genmask = nft_genmask_next(ctx->net);
10598         struct nft_set_elem_catchall *catchall;
10599         struct nft_set_ext *ext;
10600         int ret = 0;
10601
10602         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10603                 ext = nft_set_elem_ext(set, catchall->elem);
10604                 if (!nft_set_elem_active(ext, genmask))
10605                         continue;
10606
10607                 ret = nft_check_loops(ctx, ext);
10608                 if (ret < 0)
10609                         return ret;
10610         }
10611
10612         return ret;
10613 }
10614
10615 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10616                                  const struct nft_chain *chain)
10617 {
10618         const struct nft_rule *rule;
10619         const struct nft_expr *expr, *last;
10620         struct nft_set *set;
10621         struct nft_set_binding *binding;
10622         struct nft_set_iter iter;
10623
10624         if (ctx->chain == chain)
10625                 return -ELOOP;
10626
10627         if (fatal_signal_pending(current))
10628                 return -EINTR;
10629
10630         list_for_each_entry(rule, &chain->rules, list) {
10631                 nft_rule_for_each_expr(expr, last, rule) {
10632                         struct nft_immediate_expr *priv;
10633                         const struct nft_data *data;
10634                         int err;
10635
10636                         if (strcmp(expr->ops->type->name, "immediate"))
10637                                 continue;
10638
10639                         priv = nft_expr_priv(expr);
10640                         if (priv->dreg != NFT_REG_VERDICT)
10641                                 continue;
10642
10643                         data = &priv->data;
10644                         switch (data->verdict.code) {
10645                         case NFT_JUMP:
10646                         case NFT_GOTO:
10647                                 err = nf_tables_check_loops(ctx,
10648                                                         data->verdict.chain);
10649                                 if (err < 0)
10650                                         return err;
10651                                 break;
10652                         default:
10653                                 break;
10654                         }
10655                 }
10656         }
10657
10658         list_for_each_entry(set, &ctx->table->sets, list) {
10659                 if (!nft_is_active_next(ctx->net, set))
10660                         continue;
10661                 if (!(set->flags & NFT_SET_MAP) ||
10662                     set->dtype != NFT_DATA_VERDICT)
10663                         continue;
10664
10665                 list_for_each_entry(binding, &set->bindings, list) {
10666                         if (!(binding->flags & NFT_SET_MAP) ||
10667                             binding->chain != chain)
10668                                 continue;
10669
10670                         iter.genmask    = nft_genmask_next(ctx->net);
10671                         iter.skip       = 0;
10672                         iter.count      = 0;
10673                         iter.err        = 0;
10674                         iter.fn         = nf_tables_loop_check_setelem;
10675
10676                         set->ops->walk(ctx, set, &iter);
10677                         if (!iter.err)
10678                                 iter.err = nft_set_catchall_loops(ctx, set);
10679
10680                         if (iter.err < 0)
10681                                 return iter.err;
10682                 }
10683         }
10684
10685         return 0;
10686 }
10687
10688 /**
10689  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
10690  *
10691  *      @attr: netlink attribute to fetch value from
10692  *      @max: maximum value to be stored in dest
10693  *      @dest: pointer to the variable
10694  *
10695  *      Parse, check and store a given u32 netlink attribute into variable.
10696  *      This function returns -ERANGE if the value goes over maximum value.
10697  *      Otherwise a 0 is returned and the attribute value is stored in the
10698  *      destination variable.
10699  */
10700 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10701 {
10702         u32 val;
10703
10704         val = ntohl(nla_get_be32(attr));
10705         if (val > max)
10706                 return -ERANGE;
10707
10708         *dest = val;
10709         return 0;
10710 }
10711 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10712
10713 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10714 {
10715         unsigned int reg;
10716
10717         reg = ntohl(nla_get_be32(attr));
10718         switch (reg) {
10719         case NFT_REG_VERDICT...NFT_REG_4:
10720                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10721                 break;
10722         case NFT_REG32_00...NFT_REG32_15:
10723                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10724                 break;
10725         default:
10726                 return -ERANGE;
10727         }
10728
10729         return 0;
10730 }
10731
10732 /**
10733  *      nft_dump_register - dump a register value to a netlink attribute
10734  *
10735  *      @skb: socket buffer
10736  *      @attr: attribute number
10737  *      @reg: register number
10738  *
10739  *      Construct a netlink attribute containing the register number. For
10740  *      compatibility reasons, register numbers being a multiple of 4 are
10741  *      translated to the corresponding 128 bit register numbers.
10742  */
10743 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10744 {
10745         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10746                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10747         else
10748                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10749
10750         return nla_put_be32(skb, attr, htonl(reg));
10751 }
10752 EXPORT_SYMBOL_GPL(nft_dump_register);
10753
10754 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10755 {
10756         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10757                 return -EINVAL;
10758         if (len == 0)
10759                 return -EINVAL;
10760         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10761                 return -ERANGE;
10762
10763         return 0;
10764 }
10765
10766 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10767 {
10768         u32 reg;
10769         int err;
10770
10771         err = nft_parse_register(attr, &reg);
10772         if (err < 0)
10773                 return err;
10774
10775         err = nft_validate_register_load(reg, len);
10776         if (err < 0)
10777                 return err;
10778
10779         *sreg = reg;
10780         return 0;
10781 }
10782 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10783
10784 static int nft_validate_register_store(const struct nft_ctx *ctx,
10785                                        enum nft_registers reg,
10786                                        const struct nft_data *data,
10787                                        enum nft_data_types type,
10788                                        unsigned int len)
10789 {
10790         int err;
10791
10792         switch (reg) {
10793         case NFT_REG_VERDICT:
10794                 if (type != NFT_DATA_VERDICT)
10795                         return -EINVAL;
10796
10797                 if (data != NULL &&
10798                     (data->verdict.code == NFT_GOTO ||
10799                      data->verdict.code == NFT_JUMP)) {
10800                         err = nf_tables_check_loops(ctx, data->verdict.chain);
10801                         if (err < 0)
10802                                 return err;
10803                 }
10804
10805                 return 0;
10806         default:
10807                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10808                         return -EINVAL;
10809                 if (len == 0)
10810                         return -EINVAL;
10811                 if (reg * NFT_REG32_SIZE + len >
10812                     sizeof_field(struct nft_regs, data))
10813                         return -ERANGE;
10814
10815                 if (data != NULL && type != NFT_DATA_VALUE)
10816                         return -EINVAL;
10817                 return 0;
10818         }
10819 }
10820
10821 int nft_parse_register_store(const struct nft_ctx *ctx,
10822                              const struct nlattr *attr, u8 *dreg,
10823                              const struct nft_data *data,
10824                              enum nft_data_types type, unsigned int len)
10825 {
10826         int err;
10827         u32 reg;
10828
10829         err = nft_parse_register(attr, &reg);
10830         if (err < 0)
10831                 return err;
10832
10833         err = nft_validate_register_store(ctx, reg, data, type, len);
10834         if (err < 0)
10835                 return err;
10836
10837         *dreg = reg;
10838         return 0;
10839 }
10840 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10841
10842 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10843         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
10844         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
10845                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
10846         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10847 };
10848
10849 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10850                             struct nft_data_desc *desc, const struct nlattr *nla)
10851 {
10852         u8 genmask = nft_genmask_next(ctx->net);
10853         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10854         struct nft_chain *chain;
10855         int err;
10856
10857         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10858                                           nft_verdict_policy, NULL);
10859         if (err < 0)
10860                 return err;
10861
10862         if (!tb[NFTA_VERDICT_CODE])
10863                 return -EINVAL;
10864
10865         /* zero padding hole for memcmp */
10866         memset(data, 0, sizeof(*data));
10867         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10868
10869         switch (data->verdict.code) {
10870         default:
10871                 switch (data->verdict.code & NF_VERDICT_MASK) {
10872                 case NF_ACCEPT:
10873                 case NF_DROP:
10874                 case NF_QUEUE:
10875                         break;
10876                 default:
10877                         return -EINVAL;
10878                 }
10879                 fallthrough;
10880         case NFT_CONTINUE:
10881         case NFT_BREAK:
10882         case NFT_RETURN:
10883                 break;
10884         case NFT_JUMP:
10885         case NFT_GOTO:
10886                 if (tb[NFTA_VERDICT_CHAIN]) {
10887                         chain = nft_chain_lookup(ctx->net, ctx->table,
10888                                                  tb[NFTA_VERDICT_CHAIN],
10889                                                  genmask);
10890                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10891                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10892                                                       tb[NFTA_VERDICT_CHAIN_ID],
10893                                                       genmask);
10894                         if (IS_ERR(chain))
10895                                 return PTR_ERR(chain);
10896                 } else {
10897                         return -EINVAL;
10898                 }
10899
10900                 if (IS_ERR(chain))
10901                         return PTR_ERR(chain);
10902                 if (nft_is_base_chain(chain))
10903                         return -EOPNOTSUPP;
10904                 if (nft_chain_is_bound(chain))
10905                         return -EINVAL;
10906                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10907                     chain->flags & NFT_CHAIN_BINDING)
10908                         return -EINVAL;
10909                 if (!nft_use_inc(&chain->use))
10910                         return -EMFILE;
10911
10912                 data->verdict.chain = chain;
10913                 break;
10914         }
10915
10916         desc->len = sizeof(data->verdict);
10917
10918         return 0;
10919 }
10920
10921 static void nft_verdict_uninit(const struct nft_data *data)
10922 {
10923         struct nft_chain *chain;
10924
10925         switch (data->verdict.code) {
10926         case NFT_JUMP:
10927         case NFT_GOTO:
10928                 chain = data->verdict.chain;
10929                 nft_use_dec(&chain->use);
10930                 break;
10931         }
10932 }
10933
10934 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10935 {
10936         struct nlattr *nest;
10937
10938         nest = nla_nest_start_noflag(skb, type);
10939         if (!nest)
10940                 goto nla_put_failure;
10941
10942         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10943                 goto nla_put_failure;
10944
10945         switch (v->code) {
10946         case NFT_JUMP:
10947         case NFT_GOTO:
10948                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10949                                    v->chain->name))
10950                         goto nla_put_failure;
10951         }
10952         nla_nest_end(skb, nest);
10953         return 0;
10954
10955 nla_put_failure:
10956         return -1;
10957 }
10958
10959 static int nft_value_init(const struct nft_ctx *ctx,
10960                           struct nft_data *data, struct nft_data_desc *desc,
10961                           const struct nlattr *nla)
10962 {
10963         unsigned int len;
10964
10965         len = nla_len(nla);
10966         if (len == 0)
10967                 return -EINVAL;
10968         if (len > desc->size)
10969                 return -EOVERFLOW;
10970         if (desc->len) {
10971                 if (len != desc->len)
10972                         return -EINVAL;
10973         } else {
10974                 desc->len = len;
10975         }
10976
10977         nla_memcpy(data->data, nla, len);
10978
10979         return 0;
10980 }
10981
10982 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10983                           unsigned int len)
10984 {
10985         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10986 }
10987
10988 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10989         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
10990         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
10991 };
10992
10993 /**
10994  *      nft_data_init - parse nf_tables data netlink attributes
10995  *
10996  *      @ctx: context of the expression using the data
10997  *      @data: destination struct nft_data
10998  *      @desc: data description
10999  *      @nla: netlink attribute containing data
11000  *
11001  *      Parse the netlink data attributes and initialize a struct nft_data.
11002  *      The type and length of data are returned in the data description.
11003  *
11004  *      The caller can indicate that it only wants to accept data of type
11005  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
11006  */
11007 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
11008                   struct nft_data_desc *desc, const struct nlattr *nla)
11009 {
11010         struct nlattr *tb[NFTA_DATA_MAX + 1];
11011         int err;
11012
11013         if (WARN_ON_ONCE(!desc->size))
11014                 return -EINVAL;
11015
11016         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
11017                                           nft_data_policy, NULL);
11018         if (err < 0)
11019                 return err;
11020
11021         if (tb[NFTA_DATA_VALUE]) {
11022                 if (desc->type != NFT_DATA_VALUE)
11023                         return -EINVAL;
11024
11025                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
11026         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
11027                 if (desc->type != NFT_DATA_VERDICT)
11028                         return -EINVAL;
11029
11030                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
11031         } else {
11032                 err = -EINVAL;
11033         }
11034
11035         return err;
11036 }
11037 EXPORT_SYMBOL_GPL(nft_data_init);
11038
11039 /**
11040  *      nft_data_release - release a nft_data item
11041  *
11042  *      @data: struct nft_data to release
11043  *      @type: type of data
11044  *
11045  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
11046  *      all others need to be released by calling this function.
11047  */
11048 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
11049 {
11050         if (type < NFT_DATA_VERDICT)
11051                 return;
11052         switch (type) {
11053         case NFT_DATA_VERDICT:
11054                 return nft_verdict_uninit(data);
11055         default:
11056                 WARN_ON(1);
11057         }
11058 }
11059 EXPORT_SYMBOL_GPL(nft_data_release);
11060
11061 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
11062                   enum nft_data_types type, unsigned int len)
11063 {
11064         struct nlattr *nest;
11065         int err;
11066
11067         nest = nla_nest_start_noflag(skb, attr);
11068         if (nest == NULL)
11069                 return -1;
11070
11071         switch (type) {
11072         case NFT_DATA_VALUE:
11073                 err = nft_value_dump(skb, data, len);
11074                 break;
11075         case NFT_DATA_VERDICT:
11076                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
11077                 break;
11078         default:
11079                 err = -EINVAL;
11080                 WARN_ON(1);
11081         }
11082
11083         nla_nest_end(skb, nest);
11084         return err;
11085 }
11086 EXPORT_SYMBOL_GPL(nft_data_dump);
11087
11088 int __nft_release_basechain(struct nft_ctx *ctx)
11089 {
11090         struct nft_rule *rule, *nr;
11091
11092         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
11093                 return 0;
11094
11095         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
11096         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
11097                 list_del(&rule->list);
11098                 nft_use_dec(&ctx->chain->use);
11099                 nf_tables_rule_release(ctx, rule);
11100         }
11101         nft_chain_del(ctx->chain);
11102         nft_use_dec(&ctx->table->use);
11103         nf_tables_chain_destroy(ctx);
11104
11105         return 0;
11106 }
11107 EXPORT_SYMBOL_GPL(__nft_release_basechain);
11108
11109 static void __nft_release_hook(struct net *net, struct nft_table *table)
11110 {
11111         struct nft_flowtable *flowtable;
11112         struct nft_chain *chain;
11113
11114         list_for_each_entry(chain, &table->chains, list)
11115                 __nf_tables_unregister_hook(net, table, chain, true);
11116         list_for_each_entry(flowtable, &table->flowtables, list)
11117                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
11118                                                      true);
11119 }
11120
11121 static void __nft_release_hooks(struct net *net)
11122 {
11123         struct nftables_pernet *nft_net = nft_pernet(net);
11124         struct nft_table *table;
11125
11126         list_for_each_entry(table, &nft_net->tables, list) {
11127                 if (nft_table_has_owner(table))
11128                         continue;
11129
11130                 __nft_release_hook(net, table);
11131         }
11132 }
11133
11134 static void __nft_release_table(struct net *net, struct nft_table *table)
11135 {
11136         struct nft_flowtable *flowtable, *nf;
11137         struct nft_chain *chain, *nc;
11138         struct nft_object *obj, *ne;
11139         struct nft_rule *rule, *nr;
11140         struct nft_set *set, *ns;
11141         struct nft_ctx ctx = {
11142                 .net    = net,
11143                 .family = NFPROTO_NETDEV,
11144         };
11145
11146         ctx.family = table->family;
11147         ctx.table = table;
11148         list_for_each_entry(chain, &table->chains, list) {
11149                 if (nft_chain_binding(chain))
11150                         continue;
11151
11152                 ctx.chain = chain;
11153                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
11154                         list_del(&rule->list);
11155                         nft_use_dec(&chain->use);
11156                         nf_tables_rule_release(&ctx, rule);
11157                 }
11158         }
11159         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
11160                 list_del(&flowtable->list);
11161                 nft_use_dec(&table->use);
11162                 nf_tables_flowtable_destroy(flowtable);
11163         }
11164         list_for_each_entry_safe(set, ns, &table->sets, list) {
11165                 list_del(&set->list);
11166                 nft_use_dec(&table->use);
11167                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
11168                         nft_map_deactivate(&ctx, set);
11169
11170                 nft_set_destroy(&ctx, set);
11171         }
11172         list_for_each_entry_safe(obj, ne, &table->objects, list) {
11173                 nft_obj_del(obj);
11174                 nft_use_dec(&table->use);
11175                 nft_obj_destroy(&ctx, obj);
11176         }
11177         list_for_each_entry_safe(chain, nc, &table->chains, list) {
11178                 ctx.chain = chain;
11179                 nft_chain_del(chain);
11180                 nft_use_dec(&table->use);
11181                 nf_tables_chain_destroy(&ctx);
11182         }
11183         nf_tables_table_destroy(&ctx);
11184 }
11185
11186 static void __nft_release_tables(struct net *net)
11187 {
11188         struct nftables_pernet *nft_net = nft_pernet(net);
11189         struct nft_table *table, *nt;
11190
11191         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
11192                 if (nft_table_has_owner(table))
11193                         continue;
11194
11195                 list_del(&table->list);
11196
11197                 __nft_release_table(net, table);
11198         }
11199 }
11200
11201 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
11202                             void *ptr)
11203 {
11204         struct nft_table *table, *to_delete[8];
11205         struct nftables_pernet *nft_net;
11206         struct netlink_notify *n = ptr;
11207         struct net *net = n->net;
11208         unsigned int deleted;
11209         bool restart = false;
11210         unsigned int gc_seq;
11211
11212         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
11213                 return NOTIFY_DONE;
11214
11215         nft_net = nft_pernet(net);
11216         deleted = 0;
11217         mutex_lock(&nft_net->commit_mutex);
11218
11219         gc_seq = nft_gc_seq_begin(nft_net);
11220
11221         if (!list_empty(&nf_tables_destroy_list))
11222                 nf_tables_trans_destroy_flush_work();
11223 again:
11224         list_for_each_entry(table, &nft_net->tables, list) {
11225                 if (nft_table_has_owner(table) &&
11226                     n->portid == table->nlpid) {
11227                         __nft_release_hook(net, table);
11228                         list_del_rcu(&table->list);
11229                         to_delete[deleted++] = table;
11230                         if (deleted >= ARRAY_SIZE(to_delete))
11231                                 break;
11232                 }
11233         }
11234         if (deleted) {
11235                 restart = deleted >= ARRAY_SIZE(to_delete);
11236                 synchronize_rcu();
11237                 while (deleted)
11238                         __nft_release_table(net, to_delete[--deleted]);
11239
11240                 if (restart)
11241                         goto again;
11242         }
11243         nft_gc_seq_end(nft_net, gc_seq);
11244
11245         mutex_unlock(&nft_net->commit_mutex);
11246
11247         return NOTIFY_DONE;
11248 }
11249
11250 static struct notifier_block nft_nl_notifier = {
11251         .notifier_call  = nft_rcv_nl_event,
11252 };
11253
11254 static int __net_init nf_tables_init_net(struct net *net)
11255 {
11256         struct nftables_pernet *nft_net = nft_pernet(net);
11257
11258         INIT_LIST_HEAD(&nft_net->tables);
11259         INIT_LIST_HEAD(&nft_net->commit_list);
11260         INIT_LIST_HEAD(&nft_net->binding_list);
11261         INIT_LIST_HEAD(&nft_net->module_list);
11262         INIT_LIST_HEAD(&nft_net->notify_list);
11263         mutex_init(&nft_net->commit_mutex);
11264         nft_net->base_seq = 1;
11265         nft_net->gc_seq = 0;
11266         nft_net->validate_state = NFT_VALIDATE_SKIP;
11267
11268         return 0;
11269 }
11270
11271 static void __net_exit nf_tables_pre_exit_net(struct net *net)
11272 {
11273         struct nftables_pernet *nft_net = nft_pernet(net);
11274
11275         mutex_lock(&nft_net->commit_mutex);
11276         __nft_release_hooks(net);
11277         mutex_unlock(&nft_net->commit_mutex);
11278 }
11279
11280 static void __net_exit nf_tables_exit_net(struct net *net)
11281 {
11282         struct nftables_pernet *nft_net = nft_pernet(net);
11283         unsigned int gc_seq;
11284
11285         mutex_lock(&nft_net->commit_mutex);
11286
11287         gc_seq = nft_gc_seq_begin(nft_net);
11288
11289         if (!list_empty(&nft_net->commit_list) ||
11290             !list_empty(&nft_net->module_list))
11291                 __nf_tables_abort(net, NFNL_ABORT_NONE);
11292
11293         __nft_release_tables(net);
11294
11295         nft_gc_seq_end(nft_net, gc_seq);
11296
11297         mutex_unlock(&nft_net->commit_mutex);
11298         WARN_ON_ONCE(!list_empty(&nft_net->tables));
11299         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
11300         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
11301 }
11302
11303 static void nf_tables_exit_batch(struct list_head *net_exit_list)
11304 {
11305         flush_work(&trans_gc_work);
11306 }
11307
11308 static struct pernet_operations nf_tables_net_ops = {
11309         .init           = nf_tables_init_net,
11310         .pre_exit       = nf_tables_pre_exit_net,
11311         .exit           = nf_tables_exit_net,
11312         .exit_batch     = nf_tables_exit_batch,
11313         .id             = &nf_tables_net_id,
11314         .size           = sizeof(struct nftables_pernet),
11315 };
11316
11317 static int __init nf_tables_module_init(void)
11318 {
11319         int err;
11320
11321         err = register_pernet_subsys(&nf_tables_net_ops);
11322         if (err < 0)
11323                 return err;
11324
11325         err = nft_chain_filter_init();
11326         if (err < 0)
11327                 goto err_chain_filter;
11328
11329         err = nf_tables_core_module_init();
11330         if (err < 0)
11331                 goto err_core_module;
11332
11333         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
11334         if (err < 0)
11335                 goto err_netdev_notifier;
11336
11337         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
11338         if (err < 0)
11339                 goto err_rht_objname;
11340
11341         err = nft_offload_init();
11342         if (err < 0)
11343                 goto err_offload;
11344
11345         err = netlink_register_notifier(&nft_nl_notifier);
11346         if (err < 0)
11347                 goto err_netlink_notifier;
11348
11349         /* must be last */
11350         err = nfnetlink_subsys_register(&nf_tables_subsys);
11351         if (err < 0)
11352                 goto err_nfnl_subsys;
11353
11354         nft_chain_route_init();
11355
11356         return err;
11357
11358 err_nfnl_subsys:
11359         netlink_unregister_notifier(&nft_nl_notifier);
11360 err_netlink_notifier:
11361         nft_offload_exit();
11362 err_offload:
11363         rhltable_destroy(&nft_objname_ht);
11364 err_rht_objname:
11365         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11366 err_netdev_notifier:
11367         nf_tables_core_module_exit();
11368 err_core_module:
11369         nft_chain_filter_fini();
11370 err_chain_filter:
11371         unregister_pernet_subsys(&nf_tables_net_ops);
11372         return err;
11373 }
11374
11375 static void __exit nf_tables_module_exit(void)
11376 {
11377         nfnetlink_subsys_unregister(&nf_tables_subsys);
11378         netlink_unregister_notifier(&nft_nl_notifier);
11379         nft_offload_exit();
11380         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11381         nft_chain_filter_fini();
11382         nft_chain_route_fini();
11383         unregister_pernet_subsys(&nf_tables_net_ops);
11384         cancel_work_sync(&trans_gc_work);
11385         cancel_work_sync(&trans_destroy_work);
11386         rcu_barrier();
11387         rhltable_destroy(&nft_objname_ht);
11388         nf_tables_core_module_exit();
11389 }
11390
11391 module_init(nf_tables_module_init);
11392 module_exit(nf_tables_module_exit);
11393
11394 MODULE_LICENSE("GPL");
11395 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11396 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);