net/netfilter/nf_tables_api.c

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