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