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         struct nlattr *attr;
4757         u32 num_regs = 0;
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         if (num_regs > NFT_REG32_COUNT)
4773                 return -E2BIG;
4774
4775         return 0;
4776 }
4777
4778 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4779                                     const struct nlattr *nla)
4780 {
4781         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4782         int err;
4783
4784         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4785                                           nft_set_desc_policy, NULL);
4786         if (err < 0)
4787                 return err;
4788
4789         if (da[NFTA_SET_DESC_SIZE] != NULL)
4790                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4791         if (da[NFTA_SET_DESC_CONCAT])
4792                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4793
4794         return err;
4795 }
4796
4797 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4798                               const struct nlattr * const *nla,
4799                               struct nft_expr **exprs, int *num_exprs,
4800                               u32 flags)
4801 {
4802         struct nft_expr *expr;
4803         int err, i;
4804
4805         if (nla[NFTA_SET_EXPR]) {
4806                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4807                 if (IS_ERR(expr)) {
4808                         err = PTR_ERR(expr);
4809                         goto err_set_expr_alloc;
4810                 }
4811                 exprs[0] = expr;
4812                 (*num_exprs)++;
4813         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4814                 struct nlattr *tmp;
4815                 int left;
4816
4817                 if (!(flags & NFT_SET_EXPR)) {
4818                         err = -EINVAL;
4819                         goto err_set_expr_alloc;
4820                 }
4821                 i = 0;
4822                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4823                         if (i == NFT_SET_EXPR_MAX) {
4824                                 err = -E2BIG;
4825                                 goto err_set_expr_alloc;
4826                         }
4827                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4828                                 err = -EINVAL;
4829                                 goto err_set_expr_alloc;
4830                         }
4831                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4832                         if (IS_ERR(expr)) {
4833                                 err = PTR_ERR(expr);
4834                                 goto err_set_expr_alloc;
4835                         }
4836                         exprs[i++] = expr;
4837                         (*num_exprs)++;
4838                 }
4839         }
4840
4841         return 0;
4842
4843 err_set_expr_alloc:
4844         for (i = 0; i < *num_exprs; i++)
4845                 nft_expr_destroy(ctx, exprs[i]);
4846
4847         return err;
4848 }
4849
4850 static bool nft_set_is_same(const struct nft_set *set,
4851                             const struct nft_set_desc *desc,
4852                             struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4853 {
4854         int i;
4855
4856         if (set->ktype != desc->ktype ||
4857             set->dtype != desc->dtype ||
4858             set->flags != flags ||
4859             set->klen != desc->klen ||
4860             set->dlen != desc->dlen ||
4861             set->field_count != desc->field_count ||
4862             set->num_exprs != num_exprs)
4863                 return false;
4864
4865         for (i = 0; i < desc->field_count; i++) {
4866                 if (set->field_len[i] != desc->field_len[i])
4867                         return false;
4868         }
4869
4870         for (i = 0; i < num_exprs; i++) {
4871                 if (set->exprs[i]->ops != exprs[i]->ops)
4872                         return false;
4873         }
4874
4875         return true;
4876 }
4877
4878 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4879                             const struct nlattr * const nla[])
4880 {
4881         struct netlink_ext_ack *extack = info->extack;
4882         u8 genmask = nft_genmask_next(info->net);
4883         u8 family = info->nfmsg->nfgen_family;
4884         const struct nft_set_ops *ops;
4885         struct net *net = info->net;
4886         struct nft_set_desc desc;
4887         struct nft_table *table;
4888         unsigned char *udata;
4889         struct nft_set *set;
4890         struct nft_ctx ctx;
4891         size_t alloc_size;
4892         int num_exprs = 0;
4893         char *name;
4894         int err, i;
4895         u16 udlen;
4896         u32 flags;
4897         u64 size;
4898
4899         if (nla[NFTA_SET_TABLE] == NULL ||
4900             nla[NFTA_SET_NAME] == NULL ||
4901             nla[NFTA_SET_KEY_LEN] == NULL ||
4902             nla[NFTA_SET_ID] == NULL)
4903                 return -EINVAL;
4904
4905         memset(&desc, 0, sizeof(desc));
4906
4907         desc.ktype = NFT_DATA_VALUE;
4908         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4909                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4910                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4911                         return -EINVAL;
4912         }
4913
4914         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4915         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4916                 return -EINVAL;
4917
4918         flags = 0;
4919         if (nla[NFTA_SET_FLAGS] != NULL) {
4920                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4921                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4922                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4923                               NFT_SET_MAP | NFT_SET_EVAL |
4924                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4925                         return -EOPNOTSUPP;
4926                 /* Only one of these operations is supported */
4927                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4928                              (NFT_SET_MAP | NFT_SET_OBJECT))
4929                         return -EOPNOTSUPP;
4930                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4931                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4932                         return -EOPNOTSUPP;
4933         }
4934
4935         desc.dtype = 0;
4936         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4937                 if (!(flags & NFT_SET_MAP))
4938                         return -EINVAL;
4939
4940                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4941                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4942                     desc.dtype != NFT_DATA_VERDICT)
4943                         return -EINVAL;
4944
4945                 if (desc.dtype != NFT_DATA_VERDICT) {
4946                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4947                                 return -EINVAL;
4948                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4949                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4950                                 return -EINVAL;
4951                 } else
4952                         desc.dlen = sizeof(struct nft_verdict);
4953         } else if (flags & NFT_SET_MAP)
4954                 return -EINVAL;
4955
4956         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4957                 if (!(flags & NFT_SET_OBJECT))
4958                         return -EINVAL;
4959
4960                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4961                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4962                     desc.objtype > NFT_OBJECT_MAX)
4963                         return -EOPNOTSUPP;
4964         } else if (flags & NFT_SET_OBJECT)
4965                 return -EINVAL;
4966         else
4967                 desc.objtype = NFT_OBJECT_UNSPEC;
4968
4969         desc.timeout = 0;
4970         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4971                 if (!(flags & NFT_SET_TIMEOUT))
4972                         return -EINVAL;
4973
4974                 if (flags & NFT_SET_ANONYMOUS)
4975                         return -EOPNOTSUPP;
4976
4977                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4978                 if (err)
4979                         return err;
4980         }
4981         desc.gc_int = 0;
4982         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4983                 if (!(flags & NFT_SET_TIMEOUT))
4984                         return -EINVAL;
4985
4986                 if (flags & NFT_SET_ANONYMOUS)
4987                         return -EOPNOTSUPP;
4988
4989                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4990         }
4991
4992         desc.policy = NFT_SET_POL_PERFORMANCE;
4993         if (nla[NFTA_SET_POLICY] != NULL) {
4994                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4995                 switch (desc.policy) {
4996                 case NFT_SET_POL_PERFORMANCE:
4997                 case NFT_SET_POL_MEMORY:
4998                         break;
4999                 default:
5000                         return -EOPNOTSUPP;
5001                 }
5002         }
5003
5004         if (nla[NFTA_SET_DESC] != NULL) {
5005                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
5006                 if (err < 0)
5007                         return err;
5008
5009                 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
5010                         return -EINVAL;
5011         } else if (flags & NFT_SET_CONCAT) {
5012                 return -EINVAL;
5013         }
5014
5015         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
5016                 desc.expr = true;
5017
5018         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
5019                                  NETLINK_CB(skb).portid);
5020         if (IS_ERR(table)) {
5021                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5022                 return PTR_ERR(table);
5023         }
5024
5025         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5026
5027         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
5028         if (IS_ERR(set)) {
5029                 if (PTR_ERR(set) != -ENOENT) {
5030                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5031                         return PTR_ERR(set);
5032                 }
5033         } else {
5034                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
5035
5036                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
5037                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5038                         return -EEXIST;
5039                 }
5040                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
5041                         return -EOPNOTSUPP;
5042
5043                 if (nft_set_is_anonymous(set))
5044                         return -EOPNOTSUPP;
5045
5046                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
5047                 if (err < 0)
5048                         return err;
5049
5050                 err = 0;
5051                 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
5052                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5053                         err = -EEXIST;
5054                 }
5055
5056                 for (i = 0; i < num_exprs; i++)
5057                         nft_expr_destroy(&ctx, exprs[i]);
5058
5059                 if (err < 0)
5060                         return err;
5061
5062                 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5063         }
5064
5065         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5066                 return -ENOENT;
5067
5068         ops = nft_select_set_ops(&ctx, nla, &desc);
5069         if (IS_ERR(ops))
5070                 return PTR_ERR(ops);
5071
5072         udlen = 0;
5073         if (nla[NFTA_SET_USERDATA])
5074                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5075
5076         size = 0;
5077         if (ops->privsize != NULL)
5078                 size = ops->privsize(nla, &desc);
5079         alloc_size = sizeof(*set) + size + udlen;
5080         if (alloc_size < size || alloc_size > INT_MAX)
5081                 return -ENOMEM;
5082
5083         if (!nft_use_inc(&table->use))
5084                 return -EMFILE;
5085
5086         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5087         if (!set) {
5088                 err = -ENOMEM;
5089                 goto err_alloc;
5090         }
5091
5092         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5093         if (!name) {
5094                 err = -ENOMEM;
5095                 goto err_set_name;
5096         }
5097
5098         err = nf_tables_set_alloc_name(&ctx, set, name);
5099         kfree(name);
5100         if (err < 0)
5101                 goto err_set_name;
5102
5103         udata = NULL;
5104         if (udlen) {
5105                 udata = set->data + size;
5106                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5107         }
5108
5109         INIT_LIST_HEAD(&set->bindings);
5110         INIT_LIST_HEAD(&set->catchall_list);
5111         refcount_set(&set->refs, 1);
5112         set->table = table;
5113         write_pnet(&set->net, net);
5114         set->ops = ops;
5115         set->ktype = desc.ktype;
5116         set->klen = desc.klen;
5117         set->dtype = desc.dtype;
5118         set->objtype = desc.objtype;
5119         set->dlen = desc.dlen;
5120         set->flags = flags;
5121         set->size = desc.size;
5122         set->policy = desc.policy;
5123         set->udlen = udlen;
5124         set->udata = udata;
5125         set->timeout = desc.timeout;
5126         set->gc_int = desc.gc_int;
5127
5128         set->field_count = desc.field_count;
5129         for (i = 0; i < desc.field_count; i++)
5130                 set->field_len[i] = desc.field_len[i];
5131
5132         err = ops->init(set, &desc, nla);
5133         if (err < 0)
5134                 goto err_set_init;
5135
5136         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5137         if (err < 0)
5138                 goto err_set_destroy;
5139
5140         set->num_exprs = num_exprs;
5141         set->handle = nf_tables_alloc_handle(table);
5142         INIT_LIST_HEAD(&set->pending_update);
5143
5144         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5145         if (err < 0)
5146                 goto err_set_expr_alloc;
5147
5148         list_add_tail_rcu(&set->list, &table->sets);
5149
5150         return 0;
5151
5152 err_set_expr_alloc:
5153         for (i = 0; i < set->num_exprs; i++)
5154                 nft_expr_destroy(&ctx, set->exprs[i]);
5155 err_set_destroy:
5156         ops->destroy(&ctx, set);
5157 err_set_init:
5158         kfree(set->name);
5159 err_set_name:
5160         kvfree(set);
5161 err_alloc:
5162         nft_use_dec_restore(&table->use);
5163
5164         return err;
5165 }
5166
5167 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5168                                      struct nft_set *set)
5169 {
5170         struct nft_set_elem_catchall *next, *catchall;
5171
5172         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5173                 list_del_rcu(&catchall->list);
5174                 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5175                 kfree_rcu(catchall, rcu);
5176         }
5177 }
5178
5179 static void nft_set_put(struct nft_set *set)
5180 {
5181         if (refcount_dec_and_test(&set->refs)) {
5182                 kfree(set->name);
5183                 kvfree(set);
5184         }
5185 }
5186
5187 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5188 {
5189         int i;
5190
5191         if (WARN_ON(set->use > 0))
5192                 return;
5193
5194         for (i = 0; i < set->num_exprs; i++)
5195                 nft_expr_destroy(ctx, set->exprs[i]);
5196
5197         set->ops->destroy(ctx, set);
5198         nft_set_catchall_destroy(ctx, set);
5199         nft_set_put(set);
5200 }
5201
5202 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5203                             const struct nlattr * const nla[])
5204 {
5205         struct netlink_ext_ack *extack = info->extack;
5206         u8 genmask = nft_genmask_next(info->net);
5207         u8 family = info->nfmsg->nfgen_family;
5208         struct net *net = info->net;
5209         const struct nlattr *attr;
5210         struct nft_table *table;
5211         struct nft_set *set;
5212         struct nft_ctx ctx;
5213
5214         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5215                 return -EAFNOSUPPORT;
5216
5217         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5218                                  genmask, NETLINK_CB(skb).portid);
5219         if (IS_ERR(table)) {
5220                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5221                 return PTR_ERR(table);
5222         }
5223
5224         if (nla[NFTA_SET_HANDLE]) {
5225                 attr = nla[NFTA_SET_HANDLE];
5226                 set = nft_set_lookup_byhandle(table, attr, genmask);
5227         } else {
5228                 attr = nla[NFTA_SET_NAME];
5229                 set = nft_set_lookup(table, attr, genmask);
5230         }
5231
5232         if (IS_ERR(set)) {
5233                 if (PTR_ERR(set) == -ENOENT &&
5234                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5235                         return 0;
5236
5237                 NL_SET_BAD_ATTR(extack, attr);
5238                 return PTR_ERR(set);
5239         }
5240         if (set->use ||
5241             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5242              atomic_read(&set->nelems) > 0)) {
5243                 NL_SET_BAD_ATTR(extack, attr);
5244                 return -EBUSY;
5245         }
5246
5247         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5248
5249         return nft_delset(&ctx, set);
5250 }
5251
5252 static int nft_validate_register_store(const struct nft_ctx *ctx,
5253                                        enum nft_registers reg,
5254                                        const struct nft_data *data,
5255                                        enum nft_data_types type,
5256                                        unsigned int len);
5257
5258 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5259                                      struct nft_set *set,
5260                                      struct nft_set_elem *elem)
5261 {
5262         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5263         enum nft_registers dreg;
5264
5265         dreg = nft_type_to_reg(set->dtype);
5266         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5267                                            set->dtype == NFT_DATA_VERDICT ?
5268                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
5269                                            set->dlen);
5270 }
5271
5272 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5273                                         struct nft_set *set,
5274                                         const struct nft_set_iter *iter,
5275                                         struct nft_set_elem *elem)
5276 {
5277         return nft_setelem_data_validate(ctx, set, elem);
5278 }
5279
5280 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5281                                        struct nft_set *set)
5282 {
5283         u8 genmask = nft_genmask_next(ctx->net);
5284         struct nft_set_elem_catchall *catchall;
5285         struct nft_set_elem elem;
5286         struct nft_set_ext *ext;
5287         int ret = 0;
5288
5289         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5290                 ext = nft_set_elem_ext(set, catchall->elem);
5291                 if (!nft_set_elem_active(ext, genmask))
5292                         continue;
5293
5294                 elem.priv = catchall->elem;
5295                 ret = nft_setelem_data_validate(ctx, set, &elem);
5296                 if (ret < 0)
5297                         break;
5298         }
5299
5300         return ret;
5301 }
5302
5303 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5304                        struct nft_set_binding *binding)
5305 {
5306         struct nft_set_binding *i;
5307         struct nft_set_iter iter;
5308
5309         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5310                 return -EBUSY;
5311
5312         if (binding->flags & NFT_SET_MAP) {
5313                 /* If the set is already bound to the same chain all
5314                  * jumps are already validated for that chain.
5315                  */
5316                 list_for_each_entry(i, &set->bindings, list) {
5317                         if (i->flags & NFT_SET_MAP &&
5318                             i->chain == binding->chain)
5319                                 goto bind;
5320                 }
5321
5322                 iter.genmask    = nft_genmask_next(ctx->net);
5323                 iter.skip       = 0;
5324                 iter.count      = 0;
5325                 iter.err        = 0;
5326                 iter.fn         = nf_tables_bind_check_setelem;
5327
5328                 set->ops->walk(ctx, set, &iter);
5329                 if (!iter.err)
5330                         iter.err = nft_set_catchall_bind_check(ctx, set);
5331
5332                 if (iter.err < 0)
5333                         return iter.err;
5334         }
5335 bind:
5336         if (!nft_use_inc(&set->use))
5337                 return -EMFILE;
5338
5339         binding->chain = ctx->chain;
5340         list_add_tail_rcu(&binding->list, &set->bindings);
5341         nft_set_trans_bind(ctx, set);
5342
5343         return 0;
5344 }
5345 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5346
5347 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5348                                  struct nft_set_binding *binding, bool event)
5349 {
5350         list_del_rcu(&binding->list);
5351
5352         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5353                 list_del_rcu(&set->list);
5354                 if (event)
5355                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5356                                              GFP_KERNEL);
5357         }
5358 }
5359
5360 static void nft_setelem_data_activate(const struct net *net,
5361                                       const struct nft_set *set,
5362                                       struct nft_set_elem *elem);
5363
5364 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5365                                 struct nft_set *set,
5366                                 const struct nft_set_iter *iter,
5367                                 struct nft_set_elem *elem)
5368 {
5369         nft_setelem_data_activate(ctx->net, set, elem);
5370
5371         return 0;
5372 }
5373
5374 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5375                                       struct nft_set *set)
5376 {
5377         u8 genmask = nft_genmask_next(ctx->net);
5378         struct nft_set_elem_catchall *catchall;
5379         struct nft_set_elem elem;
5380         struct nft_set_ext *ext;
5381
5382         list_for_each_entry(catchall, &set->catchall_list, list) {
5383                 ext = nft_set_elem_ext(set, catchall->elem);
5384                 if (!nft_set_elem_active(ext, genmask))
5385                         continue;
5386
5387                 elem.priv = catchall->elem;
5388                 nft_setelem_data_activate(ctx->net, set, &elem);
5389                 break;
5390         }
5391 }
5392
5393 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5394 {
5395         struct nft_set_iter iter = {
5396                 .genmask        = nft_genmask_next(ctx->net),
5397                 .fn             = nft_mapelem_activate,
5398         };
5399
5400         set->ops->walk(ctx, set, &iter);
5401         WARN_ON_ONCE(iter.err);
5402
5403         nft_map_catchall_activate(ctx, set);
5404 }
5405
5406 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5407 {
5408         if (nft_set_is_anonymous(set)) {
5409                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5410                         nft_map_activate(ctx, set);
5411
5412                 nft_clear(ctx->net, set);
5413         }
5414
5415         nft_use_inc_restore(&set->use);
5416 }
5417 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5418
5419 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5420                               struct nft_set_binding *binding,
5421                               enum nft_trans_phase phase)
5422 {
5423         switch (phase) {
5424         case NFT_TRANS_PREPARE_ERROR:
5425                 nft_set_trans_unbind(ctx, set);
5426                 if (nft_set_is_anonymous(set))
5427                         nft_deactivate_next(ctx->net, set);
5428                 else
5429                         list_del_rcu(&binding->list);
5430
5431                 nft_use_dec(&set->use);
5432                 break;
5433         case NFT_TRANS_PREPARE:
5434                 if (nft_set_is_anonymous(set)) {
5435                         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5436                                 nft_map_deactivate(ctx, set);
5437
5438                         nft_deactivate_next(ctx->net, set);
5439                 }
5440                 nft_use_dec(&set->use);
5441                 return;
5442         case NFT_TRANS_ABORT:
5443         case NFT_TRANS_RELEASE:
5444                 if (nft_set_is_anonymous(set) &&
5445                     set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5446                         nft_map_deactivate(ctx, set);
5447
5448                 nft_use_dec(&set->use);
5449                 fallthrough;
5450         default:
5451                 nf_tables_unbind_set(ctx, set, binding,
5452                                      phase == NFT_TRANS_COMMIT);
5453         }
5454 }
5455 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5456
5457 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5458 {
5459         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5460                 nft_set_destroy(ctx, set);
5461 }
5462 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5463
5464 const struct nft_set_ext_type nft_set_ext_types[] = {
5465         [NFT_SET_EXT_KEY]               = {
5466                 .align  = __alignof__(u32),
5467         },
5468         [NFT_SET_EXT_DATA]              = {
5469                 .align  = __alignof__(u32),
5470         },
5471         [NFT_SET_EXT_EXPRESSIONS]       = {
5472                 .align  = __alignof__(struct nft_set_elem_expr),
5473         },
5474         [NFT_SET_EXT_OBJREF]            = {
5475                 .len    = sizeof(struct nft_object *),
5476                 .align  = __alignof__(struct nft_object *),
5477         },
5478         [NFT_SET_EXT_FLAGS]             = {
5479                 .len    = sizeof(u8),
5480                 .align  = __alignof__(u8),
5481         },
5482         [NFT_SET_EXT_TIMEOUT]           = {
5483                 .len    = sizeof(u64),
5484                 .align  = __alignof__(u64),
5485         },
5486         [NFT_SET_EXT_EXPIRATION]        = {
5487                 .len    = sizeof(u64),
5488                 .align  = __alignof__(u64),
5489         },
5490         [NFT_SET_EXT_USERDATA]          = {
5491                 .len    = sizeof(struct nft_userdata),
5492                 .align  = __alignof__(struct nft_userdata),
5493         },
5494         [NFT_SET_EXT_KEY_END]           = {
5495                 .align  = __alignof__(u32),
5496         },
5497 };
5498
5499 /*
5500  * Set elements
5501  */
5502
5503 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5504         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
5505         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
5506         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
5507         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
5508         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
5509         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
5510                                             .len = NFT_USERDATA_MAXLEN },
5511         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
5512         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
5513                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
5514         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
5515         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
5516 };
5517
5518 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5519         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
5520                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
5521         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
5522                                             .len = NFT_SET_MAXNAMELEN - 1 },
5523         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
5524         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
5525 };
5526
5527 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5528                                   const struct nft_set *set,
5529                                   const struct nft_set_ext *ext,
5530                                   bool reset)
5531 {
5532         struct nft_set_elem_expr *elem_expr;
5533         u32 size, num_exprs = 0;
5534         struct nft_expr *expr;
5535         struct nlattr *nest;
5536
5537         elem_expr = nft_set_ext_expr(ext);
5538         nft_setelem_expr_foreach(expr, elem_expr, size)
5539                 num_exprs++;
5540
5541         if (num_exprs == 1) {
5542                 expr = nft_setelem_expr_at(elem_expr, 0);
5543                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5544                         return -1;
5545
5546                 return 0;
5547         } else if (num_exprs > 1) {
5548                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5549                 if (nest == NULL)
5550                         goto nla_put_failure;
5551
5552                 nft_setelem_expr_foreach(expr, elem_expr, size) {
5553                         expr = nft_setelem_expr_at(elem_expr, size);
5554                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5555                                 goto nla_put_failure;
5556                 }
5557                 nla_nest_end(skb, nest);
5558         }
5559         return 0;
5560
5561 nla_put_failure:
5562         return -1;
5563 }
5564
5565 static int nf_tables_fill_setelem(struct sk_buff *skb,
5566                                   const struct nft_set *set,
5567                                   const struct nft_set_elem *elem,
5568                                   bool reset)
5569 {
5570         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5571         unsigned char *b = skb_tail_pointer(skb);
5572         struct nlattr *nest;
5573
5574         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5575         if (nest == NULL)
5576                 goto nla_put_failure;
5577
5578         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5579             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5580                           NFT_DATA_VALUE, set->klen) < 0)
5581                 goto nla_put_failure;
5582
5583         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5584             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5585                           NFT_DATA_VALUE, set->klen) < 0)
5586                 goto nla_put_failure;
5587
5588         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5589             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5590                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5591                           set->dlen) < 0)
5592                 goto nla_put_failure;
5593
5594         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5595             nft_set_elem_expr_dump(skb, set, ext, reset))
5596                 goto nla_put_failure;
5597
5598         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5599             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5600                            (*nft_set_ext_obj(ext))->key.name) < 0)
5601                 goto nla_put_failure;
5602
5603         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5604             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5605                          htonl(*nft_set_ext_flags(ext))))
5606                 goto nla_put_failure;
5607
5608         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5609             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5610                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5611                          NFTA_SET_ELEM_PAD))
5612                 goto nla_put_failure;
5613
5614         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5615                 u64 expires, now = get_jiffies_64();
5616
5617                 expires = *nft_set_ext_expiration(ext);
5618                 if (time_before64(now, expires))
5619                         expires -= now;
5620                 else
5621                         expires = 0;
5622
5623                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5624                                  nf_jiffies64_to_msecs(expires),
5625                                  NFTA_SET_ELEM_PAD))
5626                         goto nla_put_failure;
5627         }
5628
5629         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5630                 struct nft_userdata *udata;
5631
5632                 udata = nft_set_ext_userdata(ext);
5633                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5634                             udata->len + 1, udata->data))
5635                         goto nla_put_failure;
5636         }
5637
5638         nla_nest_end(skb, nest);
5639         return 0;
5640
5641 nla_put_failure:
5642         nlmsg_trim(skb, b);
5643         return -EMSGSIZE;
5644 }
5645
5646 struct nft_set_dump_args {
5647         const struct netlink_callback   *cb;
5648         struct nft_set_iter             iter;
5649         struct sk_buff                  *skb;
5650         bool                            reset;
5651 };
5652
5653 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5654                                   struct nft_set *set,
5655                                   const struct nft_set_iter *iter,
5656                                   struct nft_set_elem *elem)
5657 {
5658         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5659         struct nft_set_dump_args *args;
5660
5661         if (nft_set_elem_expired(ext))
5662                 return 0;
5663
5664         args = container_of(iter, struct nft_set_dump_args, iter);
5665         return nf_tables_fill_setelem(args->skb, set, elem, args->reset);
5666 }
5667
5668 static void audit_log_nft_set_reset(const struct nft_table *table,
5669                                     unsigned int base_seq,
5670                                     unsigned int nentries)
5671 {
5672         char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
5673
5674         audit_log_nfcfg(buf, table->family, nentries,
5675                         AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
5676         kfree(buf);
5677 }
5678
5679 struct nft_set_dump_ctx {
5680         const struct nft_set    *set;
5681         struct nft_ctx          ctx;
5682 };
5683
5684 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5685                                  const struct nft_set *set, bool reset,
5686                                  unsigned int base_seq)
5687 {
5688         struct nft_set_elem_catchall *catchall;
5689         u8 genmask = nft_genmask_cur(net);
5690         struct nft_set_elem elem;
5691         struct nft_set_ext *ext;
5692         int ret = 0;
5693
5694         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5695                 ext = nft_set_elem_ext(set, catchall->elem);
5696                 if (!nft_set_elem_active(ext, genmask) ||
5697                     nft_set_elem_expired(ext))
5698                         continue;
5699
5700                 elem.priv = catchall->elem;
5701                 ret = nf_tables_fill_setelem(skb, set, &elem, reset);
5702                 if (reset && !ret)
5703                         audit_log_nft_set_reset(set->table, base_seq, 1);
5704                 break;
5705         }
5706
5707         return ret;
5708 }
5709
5710 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5711 {
5712         struct nft_set_dump_ctx *dump_ctx = cb->data;
5713         struct net *net = sock_net(skb->sk);
5714         struct nftables_pernet *nft_net;
5715         struct nft_table *table;
5716         struct nft_set *set;
5717         struct nft_set_dump_args args;
5718         bool set_found = false;
5719         struct nlmsghdr *nlh;
5720         struct nlattr *nest;
5721         bool reset = false;
5722         u32 portid, seq;
5723         int event;
5724
5725         rcu_read_lock();
5726         nft_net = nft_pernet(net);
5727         cb->seq = READ_ONCE(nft_net->base_seq);
5728
5729         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5730                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5731                     dump_ctx->ctx.family != table->family)
5732                         continue;
5733
5734                 if (table != dump_ctx->ctx.table)
5735                         continue;
5736
5737                 list_for_each_entry_rcu(set, &table->sets, list) {
5738                         if (set == dump_ctx->set) {
5739                                 set_found = true;
5740                                 break;
5741                         }
5742                 }
5743                 break;
5744         }
5745
5746         if (!set_found) {
5747                 rcu_read_unlock();
5748                 return -ENOENT;
5749         }
5750
5751         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5752         portid = NETLINK_CB(cb->skb).portid;
5753         seq    = cb->nlh->nlmsg_seq;
5754
5755         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5756                            table->family, NFNETLINK_V0, nft_base_seq(net));
5757         if (!nlh)
5758                 goto nla_put_failure;
5759
5760         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5761                 goto nla_put_failure;
5762         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5763                 goto nla_put_failure;
5764
5765         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5766         if (nest == NULL)
5767                 goto nla_put_failure;
5768
5769         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5770                 reset = true;
5771
5772         args.cb                 = cb;
5773         args.skb                = skb;
5774         args.reset              = reset;
5775         args.iter.genmask       = nft_genmask_cur(net);
5776         args.iter.skip          = cb->args[0];
5777         args.iter.count         = 0;
5778         args.iter.err           = 0;
5779         args.iter.fn            = nf_tables_dump_setelem;
5780         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5781
5782         if (!args.iter.err && args.iter.count == cb->args[0])
5783                 args.iter.err = nft_set_catchall_dump(net, skb, set,
5784                                                       reset, cb->seq);
5785         nla_nest_end(skb, nest);
5786         nlmsg_end(skb, nlh);
5787
5788         if (reset && args.iter.count > args.iter.skip)
5789                 audit_log_nft_set_reset(table, cb->seq,
5790                                         args.iter.count - args.iter.skip);
5791
5792         rcu_read_unlock();
5793
5794         if (args.iter.err && args.iter.err != -EMSGSIZE)
5795                 return args.iter.err;
5796         if (args.iter.count == cb->args[0])
5797                 return 0;
5798
5799         cb->args[0] = args.iter.count;
5800         return skb->len;
5801
5802 nla_put_failure:
5803         rcu_read_unlock();
5804         return -ENOSPC;
5805 }
5806
5807 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5808 {
5809         struct nft_set_dump_ctx *dump_ctx = cb->data;
5810
5811         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5812
5813         return cb->data ? 0 : -ENOMEM;
5814 }
5815
5816 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5817 {
5818         kfree(cb->data);
5819         return 0;
5820 }
5821
5822 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5823                                        const struct nft_ctx *ctx, u32 seq,
5824                                        u32 portid, int event, u16 flags,
5825                                        const struct nft_set *set,
5826                                        const struct nft_set_elem *elem,
5827                                        bool reset)
5828 {
5829         struct nlmsghdr *nlh;
5830         struct nlattr *nest;
5831         int err;
5832
5833         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5834         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5835                            NFNETLINK_V0, nft_base_seq(ctx->net));
5836         if (!nlh)
5837                 goto nla_put_failure;
5838
5839         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5840                 goto nla_put_failure;
5841         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5842                 goto nla_put_failure;
5843
5844         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5845         if (nest == NULL)
5846                 goto nla_put_failure;
5847
5848         err = nf_tables_fill_setelem(skb, set, elem, reset);
5849         if (err < 0)
5850                 goto nla_put_failure;
5851
5852         nla_nest_end(skb, nest);
5853
5854         nlmsg_end(skb, nlh);
5855         return 0;
5856
5857 nla_put_failure:
5858         nlmsg_trim(skb, nlh);
5859         return -1;
5860 }
5861
5862 static int nft_setelem_parse_flags(const struct nft_set *set,
5863                                    const struct nlattr *attr, u32 *flags)
5864 {
5865         if (attr == NULL)
5866                 return 0;
5867
5868         *flags = ntohl(nla_get_be32(attr));
5869         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5870                 return -EOPNOTSUPP;
5871         if (!(set->flags & NFT_SET_INTERVAL) &&
5872             *flags & NFT_SET_ELEM_INTERVAL_END)
5873                 return -EINVAL;
5874         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5875             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5876                 return -EINVAL;
5877
5878         return 0;
5879 }
5880
5881 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5882                                  struct nft_data *key, struct nlattr *attr)
5883 {
5884         struct nft_data_desc desc = {
5885                 .type   = NFT_DATA_VALUE,
5886                 .size   = NFT_DATA_VALUE_MAXLEN,
5887                 .len    = set->klen,
5888         };
5889
5890         return nft_data_init(ctx, key, &desc, attr);
5891 }
5892
5893 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5894                                   struct nft_data_desc *desc,
5895                                   struct nft_data *data,
5896                                   struct nlattr *attr)
5897 {
5898         u32 dtype;
5899
5900         if (set->dtype == NFT_DATA_VERDICT)
5901                 dtype = NFT_DATA_VERDICT;
5902         else
5903                 dtype = NFT_DATA_VALUE;
5904
5905         desc->type = dtype;
5906         desc->size = NFT_DATA_VALUE_MAXLEN;
5907         desc->len = set->dlen;
5908         desc->flags = NFT_DATA_DESC_SETELEM;
5909
5910         return nft_data_init(ctx, data, desc, attr);
5911 }
5912
5913 static void *nft_setelem_catchall_get(const struct net *net,
5914                                       const struct nft_set *set)
5915 {
5916         struct nft_set_elem_catchall *catchall;
5917         u8 genmask = nft_genmask_cur(net);
5918         struct nft_set_ext *ext;
5919         void *priv = NULL;
5920
5921         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5922                 ext = nft_set_elem_ext(set, catchall->elem);
5923                 if (!nft_set_elem_active(ext, genmask) ||
5924                     nft_set_elem_expired(ext))
5925                         continue;
5926
5927                 priv = catchall->elem;
5928                 break;
5929         }
5930
5931         return priv;
5932 }
5933
5934 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5935                            struct nft_set_elem *elem, u32 flags)
5936 {
5937         void *priv;
5938
5939         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5940                 priv = set->ops->get(ctx->net, set, elem, flags);
5941                 if (IS_ERR(priv))
5942                         return PTR_ERR(priv);
5943         } else {
5944                 priv = nft_setelem_catchall_get(ctx->net, set);
5945                 if (!priv)
5946                         return -ENOENT;
5947         }
5948         elem->priv = priv;
5949
5950         return 0;
5951 }
5952
5953 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5954                             const struct nlattr *attr, bool reset)
5955 {
5956         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5957         struct nft_set_elem elem;
5958         struct sk_buff *skb;
5959         uint32_t flags = 0;
5960         int err;
5961
5962         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5963                                           nft_set_elem_policy, NULL);
5964         if (err < 0)
5965                 return err;
5966
5967         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5968         if (err < 0)
5969                 return err;
5970
5971         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5972                 return -EINVAL;
5973
5974         if (nla[NFTA_SET_ELEM_KEY]) {
5975                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5976                                             nla[NFTA_SET_ELEM_KEY]);
5977                 if (err < 0)
5978                         return err;
5979         }
5980
5981         if (nla[NFTA_SET_ELEM_KEY_END]) {
5982                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5983                                             nla[NFTA_SET_ELEM_KEY_END]);
5984                 if (err < 0)
5985                         return err;
5986         }
5987
5988         err = nft_setelem_get(ctx, set, &elem, flags);
5989         if (err < 0)
5990                 return err;
5991
5992         err = -ENOMEM;
5993         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5994         if (skb == NULL)
5995                 return err;
5996
5997         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5998                                           NFT_MSG_NEWSETELEM, 0, set, &elem,
5999                                           reset);
6000         if (err < 0)
6001                 goto err_fill_setelem;
6002
6003         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
6004
6005 err_fill_setelem:
6006         kfree_skb(skb);
6007         return err;
6008 }
6009
6010 /* called with rcu_read_lock held */
6011 static int nf_tables_getsetelem(struct sk_buff *skb,
6012                                 const struct nfnl_info *info,
6013                                 const struct nlattr * const nla[])
6014 {
6015         struct netlink_ext_ack *extack = info->extack;
6016         u8 genmask = nft_genmask_cur(info->net);
6017         u8 family = info->nfmsg->nfgen_family;
6018         int rem, err = 0, nelems = 0;
6019         struct net *net = info->net;
6020         struct nft_table *table;
6021         struct nft_set *set;
6022         struct nlattr *attr;
6023         struct nft_ctx ctx;
6024         bool reset = false;
6025
6026         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6027                                  genmask, 0);
6028         if (IS_ERR(table)) {
6029                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6030                 return PTR_ERR(table);
6031         }
6032
6033         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6034         if (IS_ERR(set))
6035                 return PTR_ERR(set);
6036
6037         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6038
6039         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6040                 struct netlink_dump_control c = {
6041                         .start = nf_tables_dump_set_start,
6042                         .dump = nf_tables_dump_set,
6043                         .done = nf_tables_dump_set_done,
6044                         .module = THIS_MODULE,
6045                 };
6046                 struct nft_set_dump_ctx dump_ctx = {
6047                         .set = set,
6048                         .ctx = ctx,
6049                 };
6050
6051                 c.data = &dump_ctx;
6052                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6053         }
6054
6055         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6056                 return -EINVAL;
6057
6058         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
6059                 reset = true;
6060
6061         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6062                 err = nft_get_set_elem(&ctx, set, attr, reset);
6063                 if (err < 0) {
6064                         NL_SET_BAD_ATTR(extack, attr);
6065                         break;
6066                 }
6067                 nelems++;
6068         }
6069
6070         if (reset)
6071                 audit_log_nft_set_reset(table, nft_pernet(net)->base_seq,
6072                                         nelems);
6073
6074         return err;
6075 }
6076
6077 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
6078                                      const struct nft_set *set,
6079                                      const struct nft_set_elem *elem,
6080                                      int event)
6081 {
6082         struct nftables_pernet *nft_net;
6083         struct net *net = ctx->net;
6084         u32 portid = ctx->portid;
6085         struct sk_buff *skb;
6086         u16 flags = 0;
6087         int err;
6088
6089         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6090                 return;
6091
6092         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6093         if (skb == NULL)
6094                 goto err;
6095
6096         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6097                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6098
6099         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6100                                           set, elem, false);
6101         if (err < 0) {
6102                 kfree_skb(skb);
6103                 goto err;
6104         }
6105
6106         nft_net = nft_pernet(net);
6107         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6108         return;
6109 err:
6110         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6111 }
6112
6113 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6114                                               int msg_type,
6115                                               struct nft_set *set)
6116 {
6117         struct nft_trans *trans;
6118
6119         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6120         if (trans == NULL)
6121                 return NULL;
6122
6123         nft_trans_elem_set(trans) = set;
6124         return trans;
6125 }
6126
6127 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6128                                          const struct nft_set *set,
6129                                          const struct nlattr *attr)
6130 {
6131         struct nft_expr *expr;
6132         int err;
6133
6134         expr = nft_expr_init(ctx, attr);
6135         if (IS_ERR(expr))
6136                 return expr;
6137
6138         err = -EOPNOTSUPP;
6139         if (expr->ops->type->flags & NFT_EXPR_GC) {
6140                 if (set->flags & NFT_SET_TIMEOUT)
6141                         goto err_set_elem_expr;
6142                 if (!set->ops->gc_init)
6143                         goto err_set_elem_expr;
6144                 set->ops->gc_init(set);
6145         }
6146
6147         return expr;
6148
6149 err_set_elem_expr:
6150         nft_expr_destroy(ctx, expr);
6151         return ERR_PTR(err);
6152 }
6153
6154 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6155 {
6156         len += nft_set_ext_types[id].len;
6157         if (len > tmpl->ext_len[id] ||
6158             len > U8_MAX)
6159                 return -1;
6160
6161         return 0;
6162 }
6163
6164 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6165                               void *to, const void *from, u32 len)
6166 {
6167         if (nft_set_ext_check(tmpl, id, len) < 0)
6168                 return -1;
6169
6170         memcpy(to, from, len);
6171
6172         return 0;
6173 }
6174
6175 void *nft_set_elem_init(const struct nft_set *set,
6176                         const struct nft_set_ext_tmpl *tmpl,
6177                         const u32 *key, const u32 *key_end,
6178                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
6179 {
6180         struct nft_set_ext *ext;
6181         void *elem;
6182
6183         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6184         if (elem == NULL)
6185                 return ERR_PTR(-ENOMEM);
6186
6187         ext = nft_set_elem_ext(set, elem);
6188         nft_set_ext_init(ext, tmpl);
6189
6190         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6191             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6192                                nft_set_ext_key(ext), key, set->klen) < 0)
6193                 goto err_ext_check;
6194
6195         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6196             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6197                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6198                 goto err_ext_check;
6199
6200         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6201             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6202                                nft_set_ext_data(ext), data, set->dlen) < 0)
6203                 goto err_ext_check;
6204
6205         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6206                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6207                 if (expiration == 0)
6208                         *nft_set_ext_expiration(ext) += timeout;
6209         }
6210         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6211                 *nft_set_ext_timeout(ext) = timeout;
6212
6213         return elem;
6214
6215 err_ext_check:
6216         kfree(elem);
6217
6218         return ERR_PTR(-EINVAL);
6219 }
6220
6221 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6222                                         struct nft_expr *expr)
6223 {
6224         if (expr->ops->destroy_clone) {
6225                 expr->ops->destroy_clone(ctx, expr);
6226                 module_put(expr->ops->type->owner);
6227         } else {
6228                 nf_tables_expr_destroy(ctx, expr);
6229         }
6230 }
6231
6232 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6233                                       struct nft_set_elem_expr *elem_expr)
6234 {
6235         struct nft_expr *expr;
6236         u32 size;
6237
6238         nft_setelem_expr_foreach(expr, elem_expr, size)
6239                 __nft_set_elem_expr_destroy(ctx, expr);
6240 }
6241
6242 /* Drop references and destroy. Called from gc, dynset and abort path. */
6243 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
6244                           bool destroy_expr)
6245 {
6246         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6247         struct nft_ctx ctx = {
6248                 .net    = read_pnet(&set->net),
6249                 .family = set->table->family,
6250         };
6251
6252         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6253         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6254                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6255         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6256                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6257
6258         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6259                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6260         kfree(elem);
6261 }
6262 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6263
6264 /* Destroy element. References have been already dropped in the preparation
6265  * path via nft_setelem_data_deactivate().
6266  */
6267 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6268                                 const struct nft_set *set, void *elem)
6269 {
6270         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6271
6272         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6273                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6274
6275         kfree(elem);
6276 }
6277
6278 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6279                             struct nft_expr *expr_array[])
6280 {
6281         struct nft_expr *expr;
6282         int err, i, k;
6283
6284         for (i = 0; i < set->num_exprs; i++) {
6285                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6286                 if (!expr)
6287                         goto err_expr;
6288
6289                 err = nft_expr_clone(expr, set->exprs[i]);
6290                 if (err < 0) {
6291                         kfree(expr);
6292                         goto err_expr;
6293                 }
6294                 expr_array[i] = expr;
6295         }
6296
6297         return 0;
6298
6299 err_expr:
6300         for (k = i - 1; k >= 0; k--)
6301                 nft_expr_destroy(ctx, expr_array[k]);
6302
6303         return -ENOMEM;
6304 }
6305
6306 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6307                                    const struct nft_set_ext_tmpl *tmpl,
6308                                    const struct nft_set_ext *ext,
6309                                    struct nft_expr *expr_array[],
6310                                    u32 num_exprs)
6311 {
6312         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6313         u32 len = sizeof(struct nft_set_elem_expr);
6314         struct nft_expr *expr;
6315         int i, err;
6316
6317         if (num_exprs == 0)
6318                 return 0;
6319
6320         for (i = 0; i < num_exprs; i++)
6321                 len += expr_array[i]->ops->size;
6322
6323         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6324                 return -EINVAL;
6325
6326         for (i = 0; i < num_exprs; i++) {
6327                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6328                 err = nft_expr_clone(expr, expr_array[i]);
6329                 if (err < 0)
6330                         goto err_elem_expr_setup;
6331
6332                 elem_expr->size += expr_array[i]->ops->size;
6333                 nft_expr_destroy(ctx, expr_array[i]);
6334                 expr_array[i] = NULL;
6335         }
6336
6337         return 0;
6338
6339 err_elem_expr_setup:
6340         for (; i < num_exprs; i++) {
6341                 nft_expr_destroy(ctx, expr_array[i]);
6342                 expr_array[i] = NULL;
6343         }
6344
6345         return -ENOMEM;
6346 }
6347
6348 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6349                                             const struct nft_set *set)
6350 {
6351         struct nft_set_elem_catchall *catchall;
6352         u8 genmask = nft_genmask_cur(net);
6353         struct nft_set_ext *ext;
6354
6355         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6356                 ext = nft_set_elem_ext(set, catchall->elem);
6357                 if (nft_set_elem_active(ext, genmask) &&
6358                     !nft_set_elem_expired(ext) &&
6359                     !nft_set_elem_is_dead(ext))
6360                         return ext;
6361         }
6362
6363         return NULL;
6364 }
6365 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6366
6367 static int nft_setelem_catchall_insert(const struct net *net,
6368                                        struct nft_set *set,
6369                                        const struct nft_set_elem *elem,
6370                                        struct nft_set_ext **pext)
6371 {
6372         struct nft_set_elem_catchall *catchall;
6373         u8 genmask = nft_genmask_next(net);
6374         struct nft_set_ext *ext;
6375
6376         list_for_each_entry(catchall, &set->catchall_list, list) {
6377                 ext = nft_set_elem_ext(set, catchall->elem);
6378                 if (nft_set_elem_active(ext, genmask)) {
6379                         *pext = ext;
6380                         return -EEXIST;
6381                 }
6382         }
6383
6384         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6385         if (!catchall)
6386                 return -ENOMEM;
6387
6388         catchall->elem = elem->priv;
6389         list_add_tail_rcu(&catchall->list, &set->catchall_list);
6390
6391         return 0;
6392 }
6393
6394 static int nft_setelem_insert(const struct net *net,
6395                               struct nft_set *set,
6396                               const struct nft_set_elem *elem,
6397                               struct nft_set_ext **ext, unsigned int flags)
6398 {
6399         int ret;
6400
6401         if (flags & NFT_SET_ELEM_CATCHALL)
6402                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6403         else
6404                 ret = set->ops->insert(net, set, elem, ext);
6405
6406         return ret;
6407 }
6408
6409 static bool nft_setelem_is_catchall(const struct nft_set *set,
6410                                     const struct nft_set_elem *elem)
6411 {
6412         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6413
6414         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6415             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6416                 return true;
6417
6418         return false;
6419 }
6420
6421 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6422                                  struct nft_set_elem *elem)
6423 {
6424         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6425
6426         if (nft_setelem_is_catchall(set, elem)) {
6427                 nft_set_elem_change_active(net, set, ext);
6428         } else {
6429                 set->ops->activate(net, set, elem);
6430         }
6431 }
6432
6433 static int nft_setelem_catchall_deactivate(const struct net *net,
6434                                            struct nft_set *set,
6435                                            struct nft_set_elem *elem)
6436 {
6437         struct nft_set_elem_catchall *catchall;
6438         struct nft_set_ext *ext;
6439
6440         list_for_each_entry(catchall, &set->catchall_list, list) {
6441                 ext = nft_set_elem_ext(set, catchall->elem);
6442                 if (!nft_is_active_next(net, ext))
6443                         continue;
6444
6445                 kfree(elem->priv);
6446                 elem->priv = catchall->elem;
6447                 nft_set_elem_change_active(net, set, ext);
6448                 return 0;
6449         }
6450
6451         return -ENOENT;
6452 }
6453
6454 static int __nft_setelem_deactivate(const struct net *net,
6455                                     struct nft_set *set,
6456                                     struct nft_set_elem *elem)
6457 {
6458         void *priv;
6459
6460         priv = set->ops->deactivate(net, set, elem);
6461         if (!priv)
6462                 return -ENOENT;
6463
6464         kfree(elem->priv);
6465         elem->priv = priv;
6466         set->ndeact++;
6467
6468         return 0;
6469 }
6470
6471 static int nft_setelem_deactivate(const struct net *net,
6472                                   struct nft_set *set,
6473                                   struct nft_set_elem *elem, u32 flags)
6474 {
6475         int ret;
6476
6477         if (flags & NFT_SET_ELEM_CATCHALL)
6478                 ret = nft_setelem_catchall_deactivate(net, set, elem);
6479         else
6480                 ret = __nft_setelem_deactivate(net, set, elem);
6481
6482         return ret;
6483 }
6484
6485 static void nft_setelem_catchall_destroy(struct nft_set_elem_catchall *catchall)
6486 {
6487         list_del_rcu(&catchall->list);
6488         kfree_rcu(catchall, rcu);
6489 }
6490
6491 static void nft_setelem_catchall_remove(const struct net *net,
6492                                         const struct nft_set *set,
6493                                         const struct nft_set_elem *elem)
6494 {
6495         struct nft_set_elem_catchall *catchall, *next;
6496
6497         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6498                 if (catchall->elem == elem->priv) {
6499                         nft_setelem_catchall_destroy(catchall);
6500                         break;
6501                 }
6502         }
6503 }
6504
6505 static void nft_setelem_remove(const struct net *net,
6506                                const struct nft_set *set,
6507                                const struct nft_set_elem *elem)
6508 {
6509         if (nft_setelem_is_catchall(set, elem))
6510                 nft_setelem_catchall_remove(net, set, elem);
6511         else
6512                 set->ops->remove(net, set, elem);
6513 }
6514
6515 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6516                                       struct nlattr **nla, u32 flags)
6517 {
6518         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6519                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6520                 if (flags & NFT_SET_ELEM_INTERVAL_END)
6521                         return false;
6522
6523                 if (nla[NFTA_SET_ELEM_KEY_END] &&
6524                     flags & NFT_SET_ELEM_CATCHALL)
6525                         return false;
6526         } else {
6527                 if (nla[NFTA_SET_ELEM_KEY_END])
6528                         return false;
6529         }
6530
6531         return true;
6532 }
6533
6534 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6535                             const struct nlattr *attr, u32 nlmsg_flags)
6536 {
6537         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6538         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6539         u8 genmask = nft_genmask_next(ctx->net);
6540         u32 flags = 0, size = 0, num_exprs = 0;
6541         struct nft_set_ext_tmpl tmpl;
6542         struct nft_set_ext *ext, *ext2;
6543         struct nft_set_elem elem;
6544         struct nft_set_binding *binding;
6545         struct nft_object *obj = NULL;
6546         struct nft_userdata *udata;
6547         struct nft_data_desc desc;
6548         enum nft_registers dreg;
6549         struct nft_trans *trans;
6550         u64 timeout;
6551         u64 expiration;
6552         int err, i;
6553         u8 ulen;
6554
6555         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6556                                           nft_set_elem_policy, NULL);
6557         if (err < 0)
6558                 return err;
6559
6560         nft_set_ext_prepare(&tmpl);
6561
6562         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6563         if (err < 0)
6564                 return err;
6565
6566         if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6567             (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6568                 return -EINVAL;
6569
6570         if (flags != 0) {
6571                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6572                 if (err < 0)
6573                         return err;
6574         }
6575
6576         if (set->flags & NFT_SET_MAP) {
6577                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6578                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6579                         return -EINVAL;
6580         } else {
6581                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6582                         return -EINVAL;
6583         }
6584
6585         if (set->flags & NFT_SET_OBJECT) {
6586                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6587                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6588                         return -EINVAL;
6589         } else {
6590                 if (nla[NFTA_SET_ELEM_OBJREF])
6591                         return -EINVAL;
6592         }
6593
6594         if (!nft_setelem_valid_key_end(set, nla, flags))
6595                 return -EINVAL;
6596
6597         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6598              (nla[NFTA_SET_ELEM_DATA] ||
6599               nla[NFTA_SET_ELEM_OBJREF] ||
6600               nla[NFTA_SET_ELEM_TIMEOUT] ||
6601               nla[NFTA_SET_ELEM_EXPIRATION] ||
6602               nla[NFTA_SET_ELEM_USERDATA] ||
6603               nla[NFTA_SET_ELEM_EXPR] ||
6604               nla[NFTA_SET_ELEM_KEY_END] ||
6605               nla[NFTA_SET_ELEM_EXPRESSIONS]))
6606                 return -EINVAL;
6607
6608         timeout = 0;
6609         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6610                 if (!(set->flags & NFT_SET_TIMEOUT))
6611                         return -EINVAL;
6612                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6613                                             &timeout);
6614                 if (err)
6615                         return err;
6616         } else if (set->flags & NFT_SET_TIMEOUT &&
6617                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6618                 timeout = READ_ONCE(set->timeout);
6619         }
6620
6621         expiration = 0;
6622         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6623                 if (!(set->flags & NFT_SET_TIMEOUT))
6624                         return -EINVAL;
6625                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6626                                             &expiration);
6627                 if (err)
6628                         return err;
6629         }
6630
6631         if (nla[NFTA_SET_ELEM_EXPR]) {
6632                 struct nft_expr *expr;
6633
6634                 if (set->num_exprs && set->num_exprs != 1)
6635                         return -EOPNOTSUPP;
6636
6637                 expr = nft_set_elem_expr_alloc(ctx, set,
6638                                                nla[NFTA_SET_ELEM_EXPR]);
6639                 if (IS_ERR(expr))
6640                         return PTR_ERR(expr);
6641
6642                 expr_array[0] = expr;
6643                 num_exprs = 1;
6644
6645                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6646                         err = -EOPNOTSUPP;
6647                         goto err_set_elem_expr;
6648                 }
6649         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6650                 struct nft_expr *expr;
6651                 struct nlattr *tmp;
6652                 int left;
6653
6654                 i = 0;
6655                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6656                         if (i == NFT_SET_EXPR_MAX ||
6657                             (set->num_exprs && set->num_exprs == i)) {
6658                                 err = -E2BIG;
6659                                 goto err_set_elem_expr;
6660                         }
6661                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6662                                 err = -EINVAL;
6663                                 goto err_set_elem_expr;
6664                         }
6665                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6666                         if (IS_ERR(expr)) {
6667                                 err = PTR_ERR(expr);
6668                                 goto err_set_elem_expr;
6669                         }
6670                         expr_array[i] = expr;
6671                         num_exprs++;
6672
6673                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6674                                 err = -EOPNOTSUPP;
6675                                 goto err_set_elem_expr;
6676                         }
6677                         i++;
6678                 }
6679                 if (set->num_exprs && set->num_exprs != i) {
6680                         err = -EOPNOTSUPP;
6681                         goto err_set_elem_expr;
6682                 }
6683         } else if (set->num_exprs > 0 &&
6684                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6685                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6686                 if (err < 0)
6687                         goto err_set_elem_expr_clone;
6688
6689                 num_exprs = set->num_exprs;
6690         }
6691
6692         if (nla[NFTA_SET_ELEM_KEY]) {
6693                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6694                                             nla[NFTA_SET_ELEM_KEY]);
6695                 if (err < 0)
6696                         goto err_set_elem_expr;
6697
6698                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6699                 if (err < 0)
6700                         goto err_parse_key;
6701         }
6702
6703         if (nla[NFTA_SET_ELEM_KEY_END]) {
6704                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6705                                             nla[NFTA_SET_ELEM_KEY_END]);
6706                 if (err < 0)
6707                         goto err_parse_key;
6708
6709                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6710                 if (err < 0)
6711                         goto err_parse_key_end;
6712         }
6713
6714         if (timeout > 0) {
6715                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6716                 if (err < 0)
6717                         goto err_parse_key_end;
6718
6719                 if (timeout != READ_ONCE(set->timeout)) {
6720                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6721                         if (err < 0)
6722                                 goto err_parse_key_end;
6723                 }
6724         }
6725
6726         if (num_exprs) {
6727                 for (i = 0; i < num_exprs; i++)
6728                         size += expr_array[i]->ops->size;
6729
6730                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6731                                              sizeof(struct nft_set_elem_expr) + size);
6732                 if (err < 0)
6733                         goto err_parse_key_end;
6734         }
6735
6736         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6737                 obj = nft_obj_lookup(ctx->net, ctx->table,
6738                                      nla[NFTA_SET_ELEM_OBJREF],
6739                                      set->objtype, genmask);
6740                 if (IS_ERR(obj)) {
6741                         err = PTR_ERR(obj);
6742                         obj = NULL;
6743                         goto err_parse_key_end;
6744                 }
6745
6746                 if (!nft_use_inc(&obj->use)) {
6747                         err = -EMFILE;
6748                         obj = NULL;
6749                         goto err_parse_key_end;
6750                 }
6751
6752                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6753                 if (err < 0)
6754                         goto err_parse_key_end;
6755         }
6756
6757         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6758                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6759                                              nla[NFTA_SET_ELEM_DATA]);
6760                 if (err < 0)
6761                         goto err_parse_key_end;
6762
6763                 dreg = nft_type_to_reg(set->dtype);
6764                 list_for_each_entry(binding, &set->bindings, list) {
6765                         struct nft_ctx bind_ctx = {
6766                                 .net    = ctx->net,
6767                                 .family = ctx->family,
6768                                 .table  = ctx->table,
6769                                 .chain  = (struct nft_chain *)binding->chain,
6770                         };
6771
6772                         if (!(binding->flags & NFT_SET_MAP))
6773                                 continue;
6774
6775                         err = nft_validate_register_store(&bind_ctx, dreg,
6776                                                           &elem.data.val,
6777                                                           desc.type, desc.len);
6778                         if (err < 0)
6779                                 goto err_parse_data;
6780
6781                         if (desc.type == NFT_DATA_VERDICT &&
6782                             (elem.data.val.verdict.code == NFT_GOTO ||
6783                              elem.data.val.verdict.code == NFT_JUMP))
6784                                 nft_validate_state_update(ctx->table,
6785                                                           NFT_VALIDATE_NEED);
6786                 }
6787
6788                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6789                 if (err < 0)
6790                         goto err_parse_data;
6791         }
6792
6793         /* The full maximum length of userdata can exceed the maximum
6794          * offset value (U8_MAX) for following extensions, therefor it
6795          * must be the last extension added.
6796          */
6797         ulen = 0;
6798         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6799                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6800                 if (ulen > 0) {
6801                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6802                                                      ulen);
6803                         if (err < 0)
6804                                 goto err_parse_data;
6805                 }
6806         }
6807
6808         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6809                                       elem.key_end.val.data, elem.data.val.data,
6810                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6811         if (IS_ERR(elem.priv)) {
6812                 err = PTR_ERR(elem.priv);
6813                 goto err_parse_data;
6814         }
6815
6816         ext = nft_set_elem_ext(set, elem.priv);
6817         if (flags)
6818                 *nft_set_ext_flags(ext) = flags;
6819
6820         if (obj)
6821                 *nft_set_ext_obj(ext) = obj;
6822
6823         if (ulen > 0) {
6824                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6825                         err = -EINVAL;
6826                         goto err_elem_free;
6827                 }
6828                 udata = nft_set_ext_userdata(ext);
6829                 udata->len = ulen - 1;
6830                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6831         }
6832         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6833         if (err < 0)
6834                 goto err_elem_free;
6835
6836         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6837         if (trans == NULL) {
6838                 err = -ENOMEM;
6839                 goto err_elem_free;
6840         }
6841
6842         ext->genmask = nft_genmask_cur(ctx->net);
6843
6844         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6845         if (err) {
6846                 if (err == -EEXIST) {
6847                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6848                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6849                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6850                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6851                                 goto err_element_clash;
6852                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6853                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6854                              memcmp(nft_set_ext_data(ext),
6855                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6856                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6857                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6858                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6859                                 goto err_element_clash;
6860                         else if (!(nlmsg_flags & NLM_F_EXCL))
6861                                 err = 0;
6862                 } else if (err == -ENOTEMPTY) {
6863                         /* ENOTEMPTY reports overlapping between this element
6864                          * and an existing one.
6865                          */
6866                         err = -EEXIST;
6867                 }
6868                 goto err_element_clash;
6869         }
6870
6871         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6872                 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
6873
6874                 if (!atomic_add_unless(&set->nelems, 1, max)) {
6875                         err = -ENFILE;
6876                         goto err_set_full;
6877                 }
6878         }
6879
6880         nft_trans_elem(trans) = elem;
6881         nft_trans_commit_list_add_tail(ctx->net, trans);
6882         return 0;
6883
6884 err_set_full:
6885         nft_setelem_remove(ctx->net, set, &elem);
6886 err_element_clash:
6887         kfree(trans);
6888 err_elem_free:
6889         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6890 err_parse_data:
6891         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6892                 nft_data_release(&elem.data.val, desc.type);
6893 err_parse_key_end:
6894         if (obj)
6895                 nft_use_dec_restore(&obj->use);
6896
6897         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6898 err_parse_key:
6899         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6900 err_set_elem_expr:
6901         for (i = 0; i < num_exprs && expr_array[i]; i++)
6902                 nft_expr_destroy(ctx, expr_array[i]);
6903 err_set_elem_expr_clone:
6904         return err;
6905 }
6906
6907 static int nf_tables_newsetelem(struct sk_buff *skb,
6908                                 const struct nfnl_info *info,
6909                                 const struct nlattr * const nla[])
6910 {
6911         struct netlink_ext_ack *extack = info->extack;
6912         u8 genmask = nft_genmask_next(info->net);
6913         u8 family = info->nfmsg->nfgen_family;
6914         struct net *net = info->net;
6915         const struct nlattr *attr;
6916         struct nft_table *table;
6917         struct nft_set *set;
6918         struct nft_ctx ctx;
6919         int rem, err;
6920
6921         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6922                 return -EINVAL;
6923
6924         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6925                                  genmask, NETLINK_CB(skb).portid);
6926         if (IS_ERR(table)) {
6927                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6928                 return PTR_ERR(table);
6929         }
6930
6931         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6932                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6933         if (IS_ERR(set))
6934                 return PTR_ERR(set);
6935
6936         if (!list_empty(&set->bindings) &&
6937             (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
6938                 return -EBUSY;
6939
6940         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6941
6942         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6943                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6944                 if (err < 0) {
6945                         NL_SET_BAD_ATTR(extack, attr);
6946                         return err;
6947                 }
6948         }
6949
6950         if (table->validate_state == NFT_VALIDATE_DO)
6951                 return nft_table_validate(net, table);
6952
6953         return 0;
6954 }
6955
6956 /**
6957  *      nft_data_hold - hold a nft_data item
6958  *
6959  *      @data: struct nft_data to release
6960  *      @type: type of data
6961  *
6962  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6963  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6964  *      NFT_GOTO verdicts. This function must be called on active data objects
6965  *      from the second phase of the commit protocol.
6966  */
6967 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6968 {
6969         struct nft_chain *chain;
6970
6971         if (type == NFT_DATA_VERDICT) {
6972                 switch (data->verdict.code) {
6973                 case NFT_JUMP:
6974                 case NFT_GOTO:
6975                         chain = data->verdict.chain;
6976                         nft_use_inc_restore(&chain->use);
6977                         break;
6978                 }
6979         }
6980 }
6981
6982 static void nft_setelem_data_activate(const struct net *net,
6983                                       const struct nft_set *set,
6984                                       struct nft_set_elem *elem)
6985 {
6986         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6987
6988         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6989                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6990         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6991                 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
6992 }
6993
6994 void nft_setelem_data_deactivate(const struct net *net,
6995                                  const struct nft_set *set,
6996                                  struct nft_set_elem *elem)
6997 {
6998         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6999
7000         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7001                 nft_data_release(nft_set_ext_data(ext), set->dtype);
7002         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7003                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
7004 }
7005
7006 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
7007                            const struct nlattr *attr)
7008 {
7009         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
7010         struct nft_set_ext_tmpl tmpl;
7011         struct nft_set_elem elem;
7012         struct nft_set_ext *ext;
7013         struct nft_trans *trans;
7014         u32 flags = 0;
7015         int err;
7016
7017         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
7018                                           nft_set_elem_policy, NULL);
7019         if (err < 0)
7020                 return err;
7021
7022         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
7023         if (err < 0)
7024                 return err;
7025
7026         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
7027                 return -EINVAL;
7028
7029         if (!nft_setelem_valid_key_end(set, nla, flags))
7030                 return -EINVAL;
7031
7032         nft_set_ext_prepare(&tmpl);
7033
7034         if (flags != 0) {
7035                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
7036                 if (err < 0)
7037                         return err;
7038         }
7039
7040         if (nla[NFTA_SET_ELEM_KEY]) {
7041                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
7042                                             nla[NFTA_SET_ELEM_KEY]);
7043                 if (err < 0)
7044                         return err;
7045
7046                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7047                 if (err < 0)
7048                         goto fail_elem;
7049         }
7050
7051         if (nla[NFTA_SET_ELEM_KEY_END]) {
7052                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
7053                                             nla[NFTA_SET_ELEM_KEY_END]);
7054                 if (err < 0)
7055                         goto fail_elem;
7056
7057                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
7058                 if (err < 0)
7059                         goto fail_elem_key_end;
7060         }
7061
7062         err = -ENOMEM;
7063         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7064                                       elem.key_end.val.data, NULL, 0, 0,
7065                                       GFP_KERNEL_ACCOUNT);
7066         if (IS_ERR(elem.priv)) {
7067                 err = PTR_ERR(elem.priv);
7068                 goto fail_elem_key_end;
7069         }
7070
7071         ext = nft_set_elem_ext(set, elem.priv);
7072         if (flags)
7073                 *nft_set_ext_flags(ext) = flags;
7074
7075         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7076         if (trans == NULL)
7077                 goto fail_trans;
7078
7079         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7080         if (err < 0)
7081                 goto fail_ops;
7082
7083         nft_setelem_data_deactivate(ctx->net, set, &elem);
7084
7085         nft_trans_elem(trans) = elem;
7086         nft_trans_commit_list_add_tail(ctx->net, trans);
7087         return 0;
7088
7089 fail_ops:
7090         kfree(trans);
7091 fail_trans:
7092         kfree(elem.priv);
7093 fail_elem_key_end:
7094         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7095 fail_elem:
7096         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7097         return err;
7098 }
7099
7100 static int nft_setelem_flush(const struct nft_ctx *ctx,
7101                              struct nft_set *set,
7102                              const struct nft_set_iter *iter,
7103                              struct nft_set_elem *elem)
7104 {
7105         struct nft_trans *trans;
7106         int err;
7107
7108         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7109                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
7110         if (!trans)
7111                 return -ENOMEM;
7112
7113         if (!set->ops->flush(ctx->net, set, elem->priv)) {
7114                 err = -ENOENT;
7115                 goto err1;
7116         }
7117         set->ndeact++;
7118
7119         nft_setelem_data_deactivate(ctx->net, set, elem);
7120         nft_trans_elem_set(trans) = set;
7121         nft_trans_elem(trans) = *elem;
7122         nft_trans_commit_list_add_tail(ctx->net, trans);
7123
7124         return 0;
7125 err1:
7126         kfree(trans);
7127         return err;
7128 }
7129
7130 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7131                                     struct nft_set *set,
7132                                     struct nft_set_elem *elem)
7133 {
7134         struct nft_trans *trans;
7135
7136         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7137                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
7138         if (!trans)
7139                 return -ENOMEM;
7140
7141         nft_setelem_data_deactivate(ctx->net, set, elem);
7142         nft_trans_elem_set(trans) = set;
7143         nft_trans_elem(trans) = *elem;
7144         nft_trans_commit_list_add_tail(ctx->net, trans);
7145
7146         return 0;
7147 }
7148
7149 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7150                                   struct nft_set *set)
7151 {
7152         u8 genmask = nft_genmask_next(ctx->net);
7153         struct nft_set_elem_catchall *catchall;
7154         struct nft_set_elem elem;
7155         struct nft_set_ext *ext;
7156         int ret = 0;
7157
7158         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7159                 ext = nft_set_elem_ext(set, catchall->elem);
7160                 if (!nft_set_elem_active(ext, genmask))
7161                         continue;
7162
7163                 elem.priv = catchall->elem;
7164                 ret = __nft_set_catchall_flush(ctx, set, &elem);
7165                 if (ret < 0)
7166                         break;
7167                 nft_set_elem_change_active(ctx->net, set, ext);
7168         }
7169
7170         return ret;
7171 }
7172
7173 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7174 {
7175         struct nft_set_iter iter = {
7176                 .genmask        = genmask,
7177                 .fn             = nft_setelem_flush,
7178         };
7179
7180         set->ops->walk(ctx, set, &iter);
7181         if (!iter.err)
7182                 iter.err = nft_set_catchall_flush(ctx, set);
7183
7184         return iter.err;
7185 }
7186
7187 static int nf_tables_delsetelem(struct sk_buff *skb,
7188                                 const struct nfnl_info *info,
7189                                 const struct nlattr * const nla[])
7190 {
7191         struct netlink_ext_ack *extack = info->extack;
7192         u8 genmask = nft_genmask_next(info->net);
7193         u8 family = info->nfmsg->nfgen_family;
7194         struct net *net = info->net;
7195         const struct nlattr *attr;
7196         struct nft_table *table;
7197         struct nft_set *set;
7198         struct nft_ctx ctx;
7199         int rem, err = 0;
7200
7201         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7202                                  genmask, NETLINK_CB(skb).portid);
7203         if (IS_ERR(table)) {
7204                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7205                 return PTR_ERR(table);
7206         }
7207
7208         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7209         if (IS_ERR(set))
7210                 return PTR_ERR(set);
7211
7212         if (nft_set_is_anonymous(set))
7213                 return -EOPNOTSUPP;
7214
7215         if (!list_empty(&set->bindings) && (set->flags & NFT_SET_CONSTANT))
7216                 return -EBUSY;
7217
7218         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7219
7220         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7221                 return nft_set_flush(&ctx, set, genmask);
7222
7223         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7224                 err = nft_del_setelem(&ctx, set, attr);
7225                 if (err == -ENOENT &&
7226                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7227                         continue;
7228
7229                 if (err < 0) {
7230                         NL_SET_BAD_ATTR(extack, attr);
7231                         return err;
7232                 }
7233         }
7234
7235         return 0;
7236 }
7237
7238 /*
7239  * Stateful objects
7240  */
7241
7242 /**
7243  *      nft_register_obj- register nf_tables stateful object type
7244  *      @obj_type: object type
7245  *
7246  *      Registers the object type for use with nf_tables. Returns zero on
7247  *      success or a negative errno code otherwise.
7248  */
7249 int nft_register_obj(struct nft_object_type *obj_type)
7250 {
7251         if (obj_type->type == NFT_OBJECT_UNSPEC)
7252                 return -EINVAL;
7253
7254         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7255         list_add_rcu(&obj_type->list, &nf_tables_objects);
7256         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7257         return 0;
7258 }
7259 EXPORT_SYMBOL_GPL(nft_register_obj);
7260
7261 /**
7262  *      nft_unregister_obj - unregister nf_tables object type
7263  *      @obj_type: object type
7264  *
7265  *      Unregisters the object type for use with nf_tables.
7266  */
7267 void nft_unregister_obj(struct nft_object_type *obj_type)
7268 {
7269         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7270         list_del_rcu(&obj_type->list);
7271         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7272 }
7273 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7274
7275 struct nft_object *nft_obj_lookup(const struct net *net,
7276                                   const struct nft_table *table,
7277                                   const struct nlattr *nla, u32 objtype,
7278                                   u8 genmask)
7279 {
7280         struct nft_object_hash_key k = { .table = table };
7281         char search[NFT_OBJ_MAXNAMELEN];
7282         struct rhlist_head *tmp, *list;
7283         struct nft_object *obj;
7284
7285         nla_strscpy(search, nla, sizeof(search));
7286         k.name = search;
7287
7288         WARN_ON_ONCE(!rcu_read_lock_held() &&
7289                      !lockdep_commit_lock_is_held(net));
7290
7291         rcu_read_lock();
7292         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7293         if (!list)
7294                 goto out;
7295
7296         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7297                 if (objtype == obj->ops->type->type &&
7298                     nft_active_genmask(obj, genmask)) {
7299                         rcu_read_unlock();
7300                         return obj;
7301                 }
7302         }
7303 out:
7304         rcu_read_unlock();
7305         return ERR_PTR(-ENOENT);
7306 }
7307 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7308
7309 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7310                                                   const struct nlattr *nla,
7311                                                   u32 objtype, u8 genmask)
7312 {
7313         struct nft_object *obj;
7314
7315         list_for_each_entry(obj, &table->objects, list) {
7316                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7317                     objtype == obj->ops->type->type &&
7318                     nft_active_genmask(obj, genmask))
7319                         return obj;
7320         }
7321         return ERR_PTR(-ENOENT);
7322 }
7323
7324 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7325         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
7326                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
7327         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
7328                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
7329         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
7330         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
7331         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
7332         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
7333                                     .len = NFT_USERDATA_MAXLEN },
7334 };
7335
7336 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7337                                        const struct nft_object_type *type,
7338                                        const struct nlattr *attr)
7339 {
7340         struct nlattr **tb;
7341         const struct nft_object_ops *ops;
7342         struct nft_object *obj;
7343         int err = -ENOMEM;
7344
7345         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7346         if (!tb)
7347                 goto err1;
7348
7349         if (attr) {
7350                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7351                                                   type->policy, NULL);
7352                 if (err < 0)
7353                         goto err2;
7354         } else {
7355                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7356         }
7357
7358         if (type->select_ops) {
7359                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7360                 if (IS_ERR(ops)) {
7361                         err = PTR_ERR(ops);
7362                         goto err2;
7363                 }
7364         } else {
7365                 ops = type->ops;
7366         }
7367
7368         err = -ENOMEM;
7369         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7370         if (!obj)
7371                 goto err2;
7372
7373         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7374         if (err < 0)
7375                 goto err3;
7376
7377         obj->ops = ops;
7378
7379         kfree(tb);
7380         return obj;
7381 err3:
7382         kfree(obj);
7383 err2:
7384         kfree(tb);
7385 err1:
7386         return ERR_PTR(err);
7387 }
7388
7389 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7390                            struct nft_object *obj, bool reset)
7391 {
7392         struct nlattr *nest;
7393
7394         nest = nla_nest_start_noflag(skb, attr);
7395         if (!nest)
7396                 goto nla_put_failure;
7397         if (obj->ops->dump(skb, obj, reset) < 0)
7398                 goto nla_put_failure;
7399         nla_nest_end(skb, nest);
7400         return 0;
7401
7402 nla_put_failure:
7403         return -1;
7404 }
7405
7406 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
7407 {
7408         const struct nft_object_type *type;
7409
7410         list_for_each_entry(type, &nf_tables_objects, list) {
7411                 if (objtype == type->type)
7412                         return type;
7413         }
7414         return NULL;
7415 }
7416
7417 static const struct nft_object_type *
7418 nft_obj_type_get(struct net *net, u32 objtype)
7419 {
7420         const struct nft_object_type *type;
7421
7422         type = __nft_obj_type_get(objtype);
7423         if (type != NULL && try_module_get(type->owner))
7424                 return type;
7425
7426         lockdep_nfnl_nft_mutex_not_held();
7427 #ifdef CONFIG_MODULES
7428         if (type == NULL) {
7429                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7430                         return ERR_PTR(-EAGAIN);
7431         }
7432 #endif
7433         return ERR_PTR(-ENOENT);
7434 }
7435
7436 static int nf_tables_updobj(const struct nft_ctx *ctx,
7437                             const struct nft_object_type *type,
7438                             const struct nlattr *attr,
7439                             struct nft_object *obj)
7440 {
7441         struct nft_object *newobj;
7442         struct nft_trans *trans;
7443         int err = -ENOMEM;
7444
7445         if (!try_module_get(type->owner))
7446                 return -ENOENT;
7447
7448         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7449                                 sizeof(struct nft_trans_obj));
7450         if (!trans)
7451                 goto err_trans;
7452
7453         newobj = nft_obj_init(ctx, type, attr);
7454         if (IS_ERR(newobj)) {
7455                 err = PTR_ERR(newobj);
7456                 goto err_free_trans;
7457         }
7458
7459         nft_trans_obj(trans) = obj;
7460         nft_trans_obj_update(trans) = true;
7461         nft_trans_obj_newobj(trans) = newobj;
7462         nft_trans_commit_list_add_tail(ctx->net, trans);
7463
7464         return 0;
7465
7466 err_free_trans:
7467         kfree(trans);
7468 err_trans:
7469         module_put(type->owner);
7470         return err;
7471 }
7472
7473 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7474                             const struct nlattr * const nla[])
7475 {
7476         struct netlink_ext_ack *extack = info->extack;
7477         u8 genmask = nft_genmask_next(info->net);
7478         u8 family = info->nfmsg->nfgen_family;
7479         const struct nft_object_type *type;
7480         struct net *net = info->net;
7481         struct nft_table *table;
7482         struct nft_object *obj;
7483         struct nft_ctx ctx;
7484         u32 objtype;
7485         int err;
7486
7487         if (!nla[NFTA_OBJ_TYPE] ||
7488             !nla[NFTA_OBJ_NAME] ||
7489             !nla[NFTA_OBJ_DATA])
7490                 return -EINVAL;
7491
7492         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7493                                  NETLINK_CB(skb).portid);
7494         if (IS_ERR(table)) {
7495                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7496                 return PTR_ERR(table);
7497         }
7498
7499         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7500         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7501         if (IS_ERR(obj)) {
7502                 err = PTR_ERR(obj);
7503                 if (err != -ENOENT) {
7504                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7505                         return err;
7506                 }
7507         } else {
7508                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7509                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7510                         return -EEXIST;
7511                 }
7512                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7513                         return -EOPNOTSUPP;
7514
7515                 type = __nft_obj_type_get(objtype);
7516                 if (WARN_ON_ONCE(!type))
7517                         return -ENOENT;
7518
7519                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7520
7521                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7522         }
7523
7524         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7525
7526         if (!nft_use_inc(&table->use))
7527                 return -EMFILE;
7528
7529         type = nft_obj_type_get(net, objtype);
7530         if (IS_ERR(type)) {
7531                 err = PTR_ERR(type);
7532                 goto err_type;
7533         }
7534
7535         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7536         if (IS_ERR(obj)) {
7537                 err = PTR_ERR(obj);
7538                 goto err_init;
7539         }
7540         obj->key.table = table;
7541         obj->handle = nf_tables_alloc_handle(table);
7542
7543         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7544         if (!obj->key.name) {
7545                 err = -ENOMEM;
7546                 goto err_strdup;
7547         }
7548
7549         if (nla[NFTA_OBJ_USERDATA]) {
7550                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7551                 if (obj->udata == NULL)
7552                         goto err_userdata;
7553
7554                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7555         }
7556
7557         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7558         if (err < 0)
7559                 goto err_trans;
7560
7561         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7562                               nft_objname_ht_params);
7563         if (err < 0)
7564                 goto err_obj_ht;
7565
7566         list_add_tail_rcu(&obj->list, &table->objects);
7567
7568         return 0;
7569 err_obj_ht:
7570         /* queued in transaction log */
7571         INIT_LIST_HEAD(&obj->list);
7572         return err;
7573 err_trans:
7574         kfree(obj->udata);
7575 err_userdata:
7576         kfree(obj->key.name);
7577 err_strdup:
7578         if (obj->ops->destroy)
7579                 obj->ops->destroy(&ctx, obj);
7580         kfree(obj);
7581 err_init:
7582         module_put(type->owner);
7583 err_type:
7584         nft_use_dec_restore(&table->use);
7585
7586         return err;
7587 }
7588
7589 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7590                                    u32 portid, u32 seq, int event, u32 flags,
7591                                    int family, const struct nft_table *table,
7592                                    struct nft_object *obj, bool reset)
7593 {
7594         struct nlmsghdr *nlh;
7595
7596         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7597         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7598                            NFNETLINK_V0, nft_base_seq(net));
7599         if (!nlh)
7600                 goto nla_put_failure;
7601
7602         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7603             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7604             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7605                          NFTA_OBJ_PAD))
7606                 goto nla_put_failure;
7607
7608         if (event == NFT_MSG_DELOBJ) {
7609                 nlmsg_end(skb, nlh);
7610                 return 0;
7611         }
7612
7613         if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7614             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7615             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7616                 goto nla_put_failure;
7617
7618         if (obj->udata &&
7619             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7620                 goto nla_put_failure;
7621
7622         nlmsg_end(skb, nlh);
7623         return 0;
7624
7625 nla_put_failure:
7626         nlmsg_trim(skb, nlh);
7627         return -1;
7628 }
7629
7630 static void audit_log_obj_reset(const struct nft_table *table,
7631                                 unsigned int base_seq, unsigned int nentries)
7632 {
7633         char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
7634
7635         audit_log_nfcfg(buf, table->family, nentries,
7636                         AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
7637         kfree(buf);
7638 }
7639
7640 struct nft_obj_filter {
7641         char            *table;
7642         u32             type;
7643 };
7644
7645 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7646 {
7647         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7648         const struct nft_table *table;
7649         unsigned int idx = 0, s_idx = cb->args[0];
7650         struct nft_obj_filter *filter = cb->data;
7651         struct net *net = sock_net(skb->sk);
7652         int family = nfmsg->nfgen_family;
7653         struct nftables_pernet *nft_net;
7654         unsigned int entries = 0;
7655         struct nft_object *obj;
7656         bool reset = false;
7657         int rc = 0;
7658
7659         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7660                 reset = true;
7661
7662         rcu_read_lock();
7663         nft_net = nft_pernet(net);
7664         cb->seq = READ_ONCE(nft_net->base_seq);
7665
7666         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7667                 if (family != NFPROTO_UNSPEC && family != table->family)
7668                         continue;
7669
7670                 entries = 0;
7671                 list_for_each_entry_rcu(obj, &table->objects, list) {
7672                         if (!nft_is_active(net, obj))
7673                                 goto cont;
7674                         if (idx < s_idx)
7675                                 goto cont;
7676                         if (idx > s_idx)
7677                                 memset(&cb->args[1], 0,
7678                                        sizeof(cb->args) - sizeof(cb->args[0]));
7679                         if (filter && filter->table &&
7680                             strcmp(filter->table, table->name))
7681                                 goto cont;
7682                         if (filter &&
7683                             filter->type != NFT_OBJECT_UNSPEC &&
7684                             obj->ops->type->type != filter->type)
7685                                 goto cont;
7686
7687                         rc = nf_tables_fill_obj_info(skb, net,
7688                                                      NETLINK_CB(cb->skb).portid,
7689                                                      cb->nlh->nlmsg_seq,
7690                                                      NFT_MSG_NEWOBJ,
7691                                                      NLM_F_MULTI | NLM_F_APPEND,
7692                                                      table->family, table,
7693                                                      obj, reset);
7694                         if (rc < 0)
7695                                 break;
7696
7697                         entries++;
7698                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7699 cont:
7700                         idx++;
7701                 }
7702                 if (reset && entries)
7703                         audit_log_obj_reset(table, nft_net->base_seq, entries);
7704                 if (rc < 0)
7705                         break;
7706         }
7707         rcu_read_unlock();
7708
7709         cb->args[0] = idx;
7710         return skb->len;
7711 }
7712
7713 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7714 {
7715         const struct nlattr * const *nla = cb->data;
7716         struct nft_obj_filter *filter = NULL;
7717
7718         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7719                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7720                 if (!filter)
7721                         return -ENOMEM;
7722
7723                 if (nla[NFTA_OBJ_TABLE]) {
7724                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7725                         if (!filter->table) {
7726                                 kfree(filter);
7727                                 return -ENOMEM;
7728                         }
7729                 }
7730
7731                 if (nla[NFTA_OBJ_TYPE])
7732                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7733         }
7734
7735         cb->data = filter;
7736         return 0;
7737 }
7738
7739 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7740 {
7741         struct nft_obj_filter *filter = cb->data;
7742
7743         if (filter) {
7744                 kfree(filter->table);
7745                 kfree(filter);
7746         }
7747
7748         return 0;
7749 }
7750
7751 /* called with rcu_read_lock held */
7752 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7753                             const struct nlattr * const nla[])
7754 {
7755         struct netlink_ext_ack *extack = info->extack;
7756         u8 genmask = nft_genmask_cur(info->net);
7757         u8 family = info->nfmsg->nfgen_family;
7758         const struct nft_table *table;
7759         struct net *net = info->net;
7760         struct nft_object *obj;
7761         struct sk_buff *skb2;
7762         bool reset = false;
7763         u32 objtype;
7764         int err;
7765
7766         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7767                 struct netlink_dump_control c = {
7768                         .start = nf_tables_dump_obj_start,
7769                         .dump = nf_tables_dump_obj,
7770                         .done = nf_tables_dump_obj_done,
7771                         .module = THIS_MODULE,
7772                         .data = (void *)nla,
7773                 };
7774
7775                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7776         }
7777
7778         if (!nla[NFTA_OBJ_NAME] ||
7779             !nla[NFTA_OBJ_TYPE])
7780                 return -EINVAL;
7781
7782         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7783         if (IS_ERR(table)) {
7784                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7785                 return PTR_ERR(table);
7786         }
7787
7788         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7789         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7790         if (IS_ERR(obj)) {
7791                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7792                 return PTR_ERR(obj);
7793         }
7794
7795         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7796         if (!skb2)
7797                 return -ENOMEM;
7798
7799         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7800                 reset = true;
7801
7802         if (reset) {
7803                 const struct nftables_pernet *nft_net;
7804                 char *buf;
7805
7806                 nft_net = nft_pernet(net);
7807                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7808
7809                 audit_log_nfcfg(buf,
7810                                 family,
7811                                 1,
7812                                 AUDIT_NFT_OP_OBJ_RESET,
7813                                 GFP_ATOMIC);
7814                 kfree(buf);
7815         }
7816
7817         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7818                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7819                                       family, table, obj, reset);
7820         if (err < 0)
7821                 goto err_fill_obj_info;
7822
7823         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7824
7825 err_fill_obj_info:
7826         kfree_skb(skb2);
7827         return err;
7828 }
7829
7830 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7831 {
7832         if (obj->ops->destroy)
7833                 obj->ops->destroy(ctx, obj);
7834
7835         module_put(obj->ops->type->owner);
7836         kfree(obj->key.name);
7837         kfree(obj->udata);
7838         kfree(obj);
7839 }
7840
7841 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7842                             const struct nlattr * const nla[])
7843 {
7844         struct netlink_ext_ack *extack = info->extack;
7845         u8 genmask = nft_genmask_next(info->net);
7846         u8 family = info->nfmsg->nfgen_family;
7847         struct net *net = info->net;
7848         const struct nlattr *attr;
7849         struct nft_table *table;
7850         struct nft_object *obj;
7851         struct nft_ctx ctx;
7852         u32 objtype;
7853
7854         if (!nla[NFTA_OBJ_TYPE] ||
7855             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7856                 return -EINVAL;
7857
7858         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7859                                  NETLINK_CB(skb).portid);
7860         if (IS_ERR(table)) {
7861                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7862                 return PTR_ERR(table);
7863         }
7864
7865         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7866         if (nla[NFTA_OBJ_HANDLE]) {
7867                 attr = nla[NFTA_OBJ_HANDLE];
7868                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7869         } else {
7870                 attr = nla[NFTA_OBJ_NAME];
7871                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7872         }
7873
7874         if (IS_ERR(obj)) {
7875                 if (PTR_ERR(obj) == -ENOENT &&
7876                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7877                         return 0;
7878
7879                 NL_SET_BAD_ATTR(extack, attr);
7880                 return PTR_ERR(obj);
7881         }
7882         if (obj->use > 0) {
7883                 NL_SET_BAD_ATTR(extack, attr);
7884                 return -EBUSY;
7885         }
7886
7887         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7888
7889         return nft_delobj(&ctx, obj);
7890 }
7891
7892 static void
7893 __nft_obj_notify(struct net *net, const struct nft_table *table,
7894                  struct nft_object *obj, u32 portid, u32 seq, int event,
7895                  u16 flags, int family, int report, gfp_t gfp)
7896 {
7897         struct nftables_pernet *nft_net = nft_pernet(net);
7898         struct sk_buff *skb;
7899         int err;
7900
7901         if (!report &&
7902             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7903                 return;
7904
7905         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7906         if (skb == NULL)
7907                 goto err;
7908
7909         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7910                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7911                                       family, table, obj, false);
7912         if (err < 0) {
7913                 kfree_skb(skb);
7914                 goto err;
7915         }
7916
7917         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7918         return;
7919 err:
7920         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7921 }
7922
7923 void nft_obj_notify(struct net *net, const struct nft_table *table,
7924                     struct nft_object *obj, u32 portid, u32 seq, int event,
7925                     u16 flags, int family, int report, gfp_t gfp)
7926 {
7927         struct nftables_pernet *nft_net = nft_pernet(net);
7928         char *buf = kasprintf(gfp, "%s:%u",
7929                               table->name, nft_net->base_seq);
7930
7931         audit_log_nfcfg(buf,
7932                         family,
7933                         obj->handle,
7934                         event == NFT_MSG_NEWOBJ ?
7935                                  AUDIT_NFT_OP_OBJ_REGISTER :
7936                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7937                         gfp);
7938         kfree(buf);
7939
7940         __nft_obj_notify(net, table, obj, portid, seq, event,
7941                          flags, family, report, gfp);
7942 }
7943 EXPORT_SYMBOL_GPL(nft_obj_notify);
7944
7945 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7946                                  struct nft_object *obj, int event)
7947 {
7948         __nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
7949                          ctx->seq, event, ctx->flags, ctx->family,
7950                          ctx->report, GFP_KERNEL);
7951 }
7952
7953 /*
7954  * Flow tables
7955  */
7956 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7957 {
7958         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7959         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7960         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7961 }
7962 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7963
7964 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7965 {
7966         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7967         list_del_rcu(&type->list);
7968         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7969 }
7970 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7971
7972 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7973         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7974                                             .len = NFT_NAME_MAXLEN - 1 },
7975         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7976                                             .len = NFT_NAME_MAXLEN - 1 },
7977         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7978         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7979         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7980 };
7981
7982 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7983                                            const struct nlattr *nla, u8 genmask)
7984 {
7985         struct nft_flowtable *flowtable;
7986
7987         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7988                 if (!nla_strcmp(nla, flowtable->name) &&
7989                     nft_active_genmask(flowtable, genmask))
7990                         return flowtable;
7991         }
7992         return ERR_PTR(-ENOENT);
7993 }
7994 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7995
7996 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7997                                     struct nft_flowtable *flowtable,
7998                                     enum nft_trans_phase phase)
7999 {
8000         switch (phase) {
8001         case NFT_TRANS_PREPARE_ERROR:
8002         case NFT_TRANS_PREPARE:
8003         case NFT_TRANS_ABORT:
8004         case NFT_TRANS_RELEASE:
8005                 nft_use_dec(&flowtable->use);
8006                 fallthrough;
8007         default:
8008                 return;
8009         }
8010 }
8011 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
8012
8013 static struct nft_flowtable *
8014 nft_flowtable_lookup_byhandle(const struct nft_table *table,
8015                               const struct nlattr *nla, u8 genmask)
8016 {
8017        struct nft_flowtable *flowtable;
8018
8019        list_for_each_entry(flowtable, &table->flowtables, list) {
8020                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
8021                    nft_active_genmask(flowtable, genmask))
8022                        return flowtable;
8023        }
8024        return ERR_PTR(-ENOENT);
8025 }
8026
8027 struct nft_flowtable_hook {
8028         u32                     num;
8029         int                     priority;
8030         struct list_head        list;
8031 };
8032
8033 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
8034         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
8035         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
8036         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
8037 };
8038
8039 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
8040                                     const struct nlattr * const nla[],
8041                                     struct nft_flowtable_hook *flowtable_hook,
8042                                     struct nft_flowtable *flowtable,
8043                                     struct netlink_ext_ack *extack, bool add)
8044 {
8045         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
8046         struct nft_hook *hook;
8047         int hooknum, priority;
8048         int err;
8049
8050         INIT_LIST_HEAD(&flowtable_hook->list);
8051
8052         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
8053                                           nla[NFTA_FLOWTABLE_HOOK],
8054                                           nft_flowtable_hook_policy, NULL);
8055         if (err < 0)
8056                 return err;
8057
8058         if (add) {
8059                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
8060                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8061                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8062                         return -ENOENT;
8063                 }
8064
8065                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8066                 if (hooknum != NF_NETDEV_INGRESS)
8067                         return -EOPNOTSUPP;
8068
8069                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8070
8071                 flowtable_hook->priority        = priority;
8072                 flowtable_hook->num             = hooknum;
8073         } else {
8074                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8075                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8076                         if (hooknum != flowtable->hooknum)
8077                                 return -EOPNOTSUPP;
8078                 }
8079
8080                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8081                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8082                         if (priority != flowtable->data.priority)
8083                                 return -EOPNOTSUPP;
8084                 }
8085
8086                 flowtable_hook->priority        = flowtable->data.priority;
8087                 flowtable_hook->num             = flowtable->hooknum;
8088         }
8089
8090         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8091                 err = nf_tables_parse_netdev_hooks(ctx->net,
8092                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
8093                                                    &flowtable_hook->list,
8094                                                    extack);
8095                 if (err < 0)
8096                         return err;
8097         }
8098
8099         list_for_each_entry(hook, &flowtable_hook->list, list) {
8100                 hook->ops.pf            = NFPROTO_NETDEV;
8101                 hook->ops.hooknum       = flowtable_hook->num;
8102                 hook->ops.priority      = flowtable_hook->priority;
8103                 hook->ops.priv          = &flowtable->data;
8104                 hook->ops.hook          = flowtable->data.type->hook;
8105         }
8106
8107         return err;
8108 }
8109
8110 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8111 {
8112         const struct nf_flowtable_type *type;
8113
8114         list_for_each_entry(type, &nf_tables_flowtables, list) {
8115                 if (family == type->family)
8116                         return type;
8117         }
8118         return NULL;
8119 }
8120
8121 static const struct nf_flowtable_type *
8122 nft_flowtable_type_get(struct net *net, u8 family)
8123 {
8124         const struct nf_flowtable_type *type;
8125
8126         type = __nft_flowtable_type_get(family);
8127         if (type != NULL && try_module_get(type->owner))
8128                 return type;
8129
8130         lockdep_nfnl_nft_mutex_not_held();
8131 #ifdef CONFIG_MODULES
8132         if (type == NULL) {
8133                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8134                         return ERR_PTR(-EAGAIN);
8135         }
8136 #endif
8137         return ERR_PTR(-ENOENT);
8138 }
8139
8140 /* Only called from error and netdev event paths. */
8141 static void nft_unregister_flowtable_hook(struct net *net,
8142                                           struct nft_flowtable *flowtable,
8143                                           struct nft_hook *hook)
8144 {
8145         nf_unregister_net_hook(net, &hook->ops);
8146         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8147                                     FLOW_BLOCK_UNBIND);
8148 }
8149
8150 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8151                                                  struct list_head *hook_list,
8152                                                  bool release_netdev)
8153 {
8154         struct nft_hook *hook, *next;
8155
8156         list_for_each_entry_safe(hook, next, hook_list, list) {
8157                 nf_unregister_net_hook(net, &hook->ops);
8158                 if (release_netdev) {
8159                         list_del(&hook->list);
8160                         kfree_rcu(hook, rcu);
8161                 }
8162         }
8163 }
8164
8165 static void nft_unregister_flowtable_net_hooks(struct net *net,
8166                                                struct list_head *hook_list)
8167 {
8168         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8169 }
8170
8171 static int nft_register_flowtable_net_hooks(struct net *net,
8172                                             struct nft_table *table,
8173                                             struct list_head *hook_list,
8174                                             struct nft_flowtable *flowtable)
8175 {
8176         struct nft_hook *hook, *hook2, *next;
8177         struct nft_flowtable *ft;
8178         int err, i = 0;
8179
8180         list_for_each_entry(hook, hook_list, list) {
8181                 list_for_each_entry(ft, &table->flowtables, list) {
8182                         if (!nft_is_active_next(net, ft))
8183                                 continue;
8184
8185                         list_for_each_entry(hook2, &ft->hook_list, list) {
8186                                 if (hook->ops.dev == hook2->ops.dev &&
8187                                     hook->ops.pf == hook2->ops.pf) {
8188                                         err = -EEXIST;
8189                                         goto err_unregister_net_hooks;
8190                                 }
8191                         }
8192                 }
8193
8194                 err = flowtable->data.type->setup(&flowtable->data,
8195                                                   hook->ops.dev,
8196                                                   FLOW_BLOCK_BIND);
8197                 if (err < 0)
8198                         goto err_unregister_net_hooks;
8199
8200                 err = nf_register_net_hook(net, &hook->ops);
8201                 if (err < 0) {
8202                         flowtable->data.type->setup(&flowtable->data,
8203                                                     hook->ops.dev,
8204                                                     FLOW_BLOCK_UNBIND);
8205                         goto err_unregister_net_hooks;
8206                 }
8207
8208                 i++;
8209         }
8210
8211         return 0;
8212
8213 err_unregister_net_hooks:
8214         list_for_each_entry_safe(hook, next, hook_list, list) {
8215                 if (i-- <= 0)
8216                         break;
8217
8218                 nft_unregister_flowtable_hook(net, flowtable, hook);
8219                 list_del_rcu(&hook->list);
8220                 kfree_rcu(hook, rcu);
8221         }
8222
8223         return err;
8224 }
8225
8226 static void nft_hooks_destroy(struct list_head *hook_list)
8227 {
8228         struct nft_hook *hook, *next;
8229
8230         list_for_each_entry_safe(hook, next, hook_list, list) {
8231                 list_del_rcu(&hook->list);
8232                 kfree_rcu(hook, rcu);
8233         }
8234 }
8235
8236 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8237                                 struct nft_flowtable *flowtable,
8238                                 struct netlink_ext_ack *extack)
8239 {
8240         const struct nlattr * const *nla = ctx->nla;
8241         struct nft_flowtable_hook flowtable_hook;
8242         struct nft_hook *hook, *next;
8243         struct nft_trans *trans;
8244         bool unregister = false;
8245         u32 flags;
8246         int err;
8247
8248         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8249                                        extack, false);
8250         if (err < 0)
8251                 return err;
8252
8253         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8254                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8255                         list_del(&hook->list);
8256                         kfree(hook);
8257                 }
8258         }
8259
8260         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8261                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8262                 if (flags & ~NFT_FLOWTABLE_MASK) {
8263                         err = -EOPNOTSUPP;
8264                         goto err_flowtable_update_hook;
8265                 }
8266                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8267                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8268                         err = -EOPNOTSUPP;
8269                         goto err_flowtable_update_hook;
8270                 }
8271         } else {
8272                 flags = flowtable->data.flags;
8273         }
8274
8275         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8276                                                &flowtable_hook.list, flowtable);
8277         if (err < 0)
8278                 goto err_flowtable_update_hook;
8279
8280         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8281                                 sizeof(struct nft_trans_flowtable));
8282         if (!trans) {
8283                 unregister = true;
8284                 err = -ENOMEM;
8285                 goto err_flowtable_update_hook;
8286         }
8287
8288         nft_trans_flowtable_flags(trans) = flags;
8289         nft_trans_flowtable(trans) = flowtable;
8290         nft_trans_flowtable_update(trans) = true;
8291         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8292         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8293
8294         nft_trans_commit_list_add_tail(ctx->net, trans);
8295
8296         return 0;
8297
8298 err_flowtable_update_hook:
8299         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8300                 if (unregister)
8301                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8302                 list_del_rcu(&hook->list);
8303                 kfree_rcu(hook, rcu);
8304         }
8305
8306         return err;
8307
8308 }
8309
8310 static int nf_tables_newflowtable(struct sk_buff *skb,
8311                                   const struct nfnl_info *info,
8312                                   const struct nlattr * const nla[])
8313 {
8314         struct netlink_ext_ack *extack = info->extack;
8315         struct nft_flowtable_hook flowtable_hook;
8316         u8 genmask = nft_genmask_next(info->net);
8317         u8 family = info->nfmsg->nfgen_family;
8318         const struct nf_flowtable_type *type;
8319         struct nft_flowtable *flowtable;
8320         struct nft_hook *hook, *next;
8321         struct net *net = info->net;
8322         struct nft_table *table;
8323         struct nft_ctx ctx;
8324         int err;
8325
8326         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8327             !nla[NFTA_FLOWTABLE_NAME] ||
8328             !nla[NFTA_FLOWTABLE_HOOK])
8329                 return -EINVAL;
8330
8331         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8332                                  genmask, NETLINK_CB(skb).portid);
8333         if (IS_ERR(table)) {
8334                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8335                 return PTR_ERR(table);
8336         }
8337
8338         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8339                                          genmask);
8340         if (IS_ERR(flowtable)) {
8341                 err = PTR_ERR(flowtable);
8342                 if (err != -ENOENT) {
8343                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8344                         return err;
8345                 }
8346         } else {
8347                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8348                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8349                         return -EEXIST;
8350                 }
8351
8352                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8353
8354                 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8355         }
8356
8357         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8358
8359         if (!nft_use_inc(&table->use))
8360                 return -EMFILE;
8361
8362         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8363         if (!flowtable) {
8364                 err = -ENOMEM;
8365                 goto flowtable_alloc;
8366         }
8367
8368         flowtable->table = table;
8369         flowtable->handle = nf_tables_alloc_handle(table);
8370         INIT_LIST_HEAD(&flowtable->hook_list);
8371
8372         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8373         if (!flowtable->name) {
8374                 err = -ENOMEM;
8375                 goto err1;
8376         }
8377
8378         type = nft_flowtable_type_get(net, family);
8379         if (IS_ERR(type)) {
8380                 err = PTR_ERR(type);
8381                 goto err2;
8382         }
8383
8384         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8385                 flowtable->data.flags =
8386                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8387                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8388                         err = -EOPNOTSUPP;
8389                         goto err3;
8390                 }
8391         }
8392
8393         write_pnet(&flowtable->data.net, net);
8394         flowtable->data.type = type;
8395         err = type->init(&flowtable->data);
8396         if (err < 0)
8397                 goto err3;
8398
8399         err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8400                                        extack, true);
8401         if (err < 0)
8402                 goto err4;
8403
8404         list_splice(&flowtable_hook.list, &flowtable->hook_list);
8405         flowtable->data.priority = flowtable_hook.priority;
8406         flowtable->hooknum = flowtable_hook.num;
8407
8408         err = nft_register_flowtable_net_hooks(ctx.net, table,
8409                                                &flowtable->hook_list,
8410                                                flowtable);
8411         if (err < 0) {
8412                 nft_hooks_destroy(&flowtable->hook_list);
8413                 goto err4;
8414         }
8415
8416         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8417         if (err < 0)
8418                 goto err5;
8419
8420         list_add_tail_rcu(&flowtable->list, &table->flowtables);
8421
8422         return 0;
8423 err5:
8424         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8425                 nft_unregister_flowtable_hook(net, flowtable, hook);
8426                 list_del_rcu(&hook->list);
8427                 kfree_rcu(hook, rcu);
8428         }
8429 err4:
8430         flowtable->data.type->free(&flowtable->data);
8431 err3:
8432         module_put(type->owner);
8433 err2:
8434         kfree(flowtable->name);
8435 err1:
8436         kfree(flowtable);
8437 flowtable_alloc:
8438         nft_use_dec_restore(&table->use);
8439
8440         return err;
8441 }
8442
8443 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8444 {
8445         struct nft_hook *this, *next;
8446
8447         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8448                 list_del(&this->list);
8449                 kfree(this);
8450         }
8451 }
8452
8453 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8454                                  struct nft_flowtable *flowtable,
8455                                  struct netlink_ext_ack *extack)
8456 {
8457         const struct nlattr * const *nla = ctx->nla;
8458         struct nft_flowtable_hook flowtable_hook;
8459         LIST_HEAD(flowtable_del_list);
8460         struct nft_hook *this, *hook;
8461         struct nft_trans *trans;
8462         int err;
8463
8464         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8465                                        extack, false);
8466         if (err < 0)
8467                 return err;
8468
8469         list_for_each_entry(this, &flowtable_hook.list, list) {
8470                 hook = nft_hook_list_find(&flowtable->hook_list, this);
8471                 if (!hook) {
8472                         err = -ENOENT;
8473                         goto err_flowtable_del_hook;
8474                 }
8475                 list_move(&hook->list, &flowtable_del_list);
8476         }
8477
8478         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8479                                 sizeof(struct nft_trans_flowtable));
8480         if (!trans) {
8481                 err = -ENOMEM;
8482                 goto err_flowtable_del_hook;
8483         }
8484
8485         nft_trans_flowtable(trans) = flowtable;
8486         nft_trans_flowtable_update(trans) = true;
8487         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8488         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8489         nft_flowtable_hook_release(&flowtable_hook);
8490
8491         nft_trans_commit_list_add_tail(ctx->net, trans);
8492
8493         return 0;
8494
8495 err_flowtable_del_hook:
8496         list_splice(&flowtable_del_list, &flowtable->hook_list);
8497         nft_flowtable_hook_release(&flowtable_hook);
8498
8499         return err;
8500 }
8501
8502 static int nf_tables_delflowtable(struct sk_buff *skb,
8503                                   const struct nfnl_info *info,
8504                                   const struct nlattr * const nla[])
8505 {
8506         struct netlink_ext_ack *extack = info->extack;
8507         u8 genmask = nft_genmask_next(info->net);
8508         u8 family = info->nfmsg->nfgen_family;
8509         struct nft_flowtable *flowtable;
8510         struct net *net = info->net;
8511         const struct nlattr *attr;
8512         struct nft_table *table;
8513         struct nft_ctx ctx;
8514
8515         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8516             (!nla[NFTA_FLOWTABLE_NAME] &&
8517              !nla[NFTA_FLOWTABLE_HANDLE]))
8518                 return -EINVAL;
8519
8520         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8521                                  genmask, NETLINK_CB(skb).portid);
8522         if (IS_ERR(table)) {
8523                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8524                 return PTR_ERR(table);
8525         }
8526
8527         if (nla[NFTA_FLOWTABLE_HANDLE]) {
8528                 attr = nla[NFTA_FLOWTABLE_HANDLE];
8529                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8530         } else {
8531                 attr = nla[NFTA_FLOWTABLE_NAME];
8532                 flowtable = nft_flowtable_lookup(table, attr, genmask);
8533         }
8534
8535         if (IS_ERR(flowtable)) {
8536                 if (PTR_ERR(flowtable) == -ENOENT &&
8537                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8538                         return 0;
8539
8540                 NL_SET_BAD_ATTR(extack, attr);
8541                 return PTR_ERR(flowtable);
8542         }
8543
8544         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8545
8546         if (nla[NFTA_FLOWTABLE_HOOK])
8547                 return nft_delflowtable_hook(&ctx, flowtable, extack);
8548
8549         if (flowtable->use > 0) {
8550                 NL_SET_BAD_ATTR(extack, attr);
8551                 return -EBUSY;
8552         }
8553
8554         return nft_delflowtable(&ctx, flowtable);
8555 }
8556
8557 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8558                                          u32 portid, u32 seq, int event,
8559                                          u32 flags, int family,
8560                                          struct nft_flowtable *flowtable,
8561                                          struct list_head *hook_list)
8562 {
8563         struct nlattr *nest, *nest_devs;
8564         struct nft_hook *hook;
8565         struct nlmsghdr *nlh;
8566
8567         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8568         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8569                            NFNETLINK_V0, nft_base_seq(net));
8570         if (!nlh)
8571                 goto nla_put_failure;
8572
8573         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8574             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8575             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8576                          NFTA_FLOWTABLE_PAD))
8577                 goto nla_put_failure;
8578
8579         if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8580                 nlmsg_end(skb, nlh);
8581                 return 0;
8582         }
8583
8584         if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8585             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8586                 goto nla_put_failure;
8587
8588         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8589         if (!nest)
8590                 goto nla_put_failure;
8591         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8592             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8593                 goto nla_put_failure;
8594
8595         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8596         if (!nest_devs)
8597                 goto nla_put_failure;
8598
8599         if (!hook_list)
8600                 hook_list = &flowtable->hook_list;
8601
8602         list_for_each_entry_rcu(hook, hook_list, list) {
8603                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8604                         goto nla_put_failure;
8605         }
8606         nla_nest_end(skb, nest_devs);
8607         nla_nest_end(skb, nest);
8608
8609         nlmsg_end(skb, nlh);
8610         return 0;
8611
8612 nla_put_failure:
8613         nlmsg_trim(skb, nlh);
8614         return -1;
8615 }
8616
8617 struct nft_flowtable_filter {
8618         char            *table;
8619 };
8620
8621 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8622                                     struct netlink_callback *cb)
8623 {
8624         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8625         struct nft_flowtable_filter *filter = cb->data;
8626         unsigned int idx = 0, s_idx = cb->args[0];
8627         struct net *net = sock_net(skb->sk);
8628         int family = nfmsg->nfgen_family;
8629         struct nft_flowtable *flowtable;
8630         struct nftables_pernet *nft_net;
8631         const struct nft_table *table;
8632
8633         rcu_read_lock();
8634         nft_net = nft_pernet(net);
8635         cb->seq = READ_ONCE(nft_net->base_seq);
8636
8637         list_for_each_entry_rcu(table, &nft_net->tables, list) {
8638                 if (family != NFPROTO_UNSPEC && family != table->family)
8639                         continue;
8640
8641                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8642                         if (!nft_is_active(net, flowtable))
8643                                 goto cont;
8644                         if (idx < s_idx)
8645                                 goto cont;
8646                         if (idx > s_idx)
8647                                 memset(&cb->args[1], 0,
8648                                        sizeof(cb->args) - sizeof(cb->args[0]));
8649                         if (filter && filter->table &&
8650                             strcmp(filter->table, table->name))
8651                                 goto cont;
8652
8653                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8654                                                           cb->nlh->nlmsg_seq,
8655                                                           NFT_MSG_NEWFLOWTABLE,
8656                                                           NLM_F_MULTI | NLM_F_APPEND,
8657                                                           table->family,
8658                                                           flowtable, NULL) < 0)
8659                                 goto done;
8660
8661                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8662 cont:
8663                         idx++;
8664                 }
8665         }
8666 done:
8667         rcu_read_unlock();
8668
8669         cb->args[0] = idx;
8670         return skb->len;
8671 }
8672
8673 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8674 {
8675         const struct nlattr * const *nla = cb->data;
8676         struct nft_flowtable_filter *filter = NULL;
8677
8678         if (nla[NFTA_FLOWTABLE_TABLE]) {
8679                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8680                 if (!filter)
8681                         return -ENOMEM;
8682
8683                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8684                                            GFP_ATOMIC);
8685                 if (!filter->table) {
8686                         kfree(filter);
8687                         return -ENOMEM;
8688                 }
8689         }
8690
8691         cb->data = filter;
8692         return 0;
8693 }
8694
8695 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8696 {
8697         struct nft_flowtable_filter *filter = cb->data;
8698
8699         if (!filter)
8700                 return 0;
8701
8702         kfree(filter->table);
8703         kfree(filter);
8704
8705         return 0;
8706 }
8707
8708 /* called with rcu_read_lock held */
8709 static int nf_tables_getflowtable(struct sk_buff *skb,
8710                                   const struct nfnl_info *info,
8711                                   const struct nlattr * const nla[])
8712 {
8713         u8 genmask = nft_genmask_cur(info->net);
8714         u8 family = info->nfmsg->nfgen_family;
8715         struct nft_flowtable *flowtable;
8716         const struct nft_table *table;
8717         struct net *net = info->net;
8718         struct sk_buff *skb2;
8719         int err;
8720
8721         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8722                 struct netlink_dump_control c = {
8723                         .start = nf_tables_dump_flowtable_start,
8724                         .dump = nf_tables_dump_flowtable,
8725                         .done = nf_tables_dump_flowtable_done,
8726                         .module = THIS_MODULE,
8727                         .data = (void *)nla,
8728                 };
8729
8730                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8731         }
8732
8733         if (!nla[NFTA_FLOWTABLE_NAME])
8734                 return -EINVAL;
8735
8736         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8737                                  genmask, 0);
8738         if (IS_ERR(table))
8739                 return PTR_ERR(table);
8740
8741         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8742                                          genmask);
8743         if (IS_ERR(flowtable))
8744                 return PTR_ERR(flowtable);
8745
8746         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8747         if (!skb2)
8748                 return -ENOMEM;
8749
8750         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8751                                             info->nlh->nlmsg_seq,
8752                                             NFT_MSG_NEWFLOWTABLE, 0, family,
8753                                             flowtable, NULL);
8754         if (err < 0)
8755                 goto err_fill_flowtable_info;
8756
8757         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8758
8759 err_fill_flowtable_info:
8760         kfree_skb(skb2);
8761         return err;
8762 }
8763
8764 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8765                                        struct nft_flowtable *flowtable,
8766                                        struct list_head *hook_list, int event)
8767 {
8768         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8769         struct sk_buff *skb;
8770         u16 flags = 0;
8771         int err;
8772
8773         if (!ctx->report &&
8774             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8775                 return;
8776
8777         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8778         if (skb == NULL)
8779                 goto err;
8780
8781         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8782                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8783
8784         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8785                                             ctx->seq, event, flags,
8786                                             ctx->family, flowtable, hook_list);
8787         if (err < 0) {
8788                 kfree_skb(skb);
8789                 goto err;
8790         }
8791
8792         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8793         return;
8794 err:
8795         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8796 }
8797
8798 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8799 {
8800         struct nft_hook *hook, *next;
8801
8802         flowtable->data.type->free(&flowtable->data);
8803         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8804                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8805                                             FLOW_BLOCK_UNBIND);
8806                 list_del_rcu(&hook->list);
8807                 kfree(hook);
8808         }
8809         kfree(flowtable->name);
8810         module_put(flowtable->data.type->owner);
8811         kfree(flowtable);
8812 }
8813
8814 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8815                                    u32 portid, u32 seq)
8816 {
8817         struct nftables_pernet *nft_net = nft_pernet(net);
8818         struct nlmsghdr *nlh;
8819         char buf[TASK_COMM_LEN];
8820         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8821
8822         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8823                            NFNETLINK_V0, nft_base_seq(net));
8824         if (!nlh)
8825                 goto nla_put_failure;
8826
8827         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8828             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8829             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8830                 goto nla_put_failure;
8831
8832         nlmsg_end(skb, nlh);
8833         return 0;
8834
8835 nla_put_failure:
8836         nlmsg_trim(skb, nlh);
8837         return -EMSGSIZE;
8838 }
8839
8840 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8841                                 struct nft_flowtable *flowtable)
8842 {
8843         struct nft_hook *hook;
8844
8845         list_for_each_entry(hook, &flowtable->hook_list, list) {
8846                 if (hook->ops.dev != dev)
8847                         continue;
8848
8849                 /* flow_offload_netdev_event() cleans up entries for us. */
8850                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8851                 list_del_rcu(&hook->list);
8852                 kfree_rcu(hook, rcu);
8853                 break;
8854         }
8855 }
8856
8857 static int nf_tables_flowtable_event(struct notifier_block *this,
8858                                      unsigned long event, void *ptr)
8859 {
8860         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8861         struct nft_flowtable *flowtable;
8862         struct nftables_pernet *nft_net;
8863         struct nft_table *table;
8864         struct net *net;
8865
8866         if (event != NETDEV_UNREGISTER)
8867                 return 0;
8868
8869         net = dev_net(dev);
8870         nft_net = nft_pernet(net);
8871         mutex_lock(&nft_net->commit_mutex);
8872         list_for_each_entry(table, &nft_net->tables, list) {
8873                 list_for_each_entry(flowtable, &table->flowtables, list) {
8874                         nft_flowtable_event(event, dev, flowtable);
8875                 }
8876         }
8877         mutex_unlock(&nft_net->commit_mutex);
8878
8879         return NOTIFY_DONE;
8880 }
8881
8882 static struct notifier_block nf_tables_flowtable_notifier = {
8883         .notifier_call  = nf_tables_flowtable_event,
8884 };
8885
8886 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8887                                  int event)
8888 {
8889         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8890         struct sk_buff *skb2;
8891         int err;
8892
8893         if (!nlmsg_report(nlh) &&
8894             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8895                 return;
8896
8897         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8898         if (skb2 == NULL)
8899                 goto err;
8900
8901         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8902                                       nlh->nlmsg_seq);
8903         if (err < 0) {
8904                 kfree_skb(skb2);
8905                 goto err;
8906         }
8907
8908         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8909                        nlmsg_report(nlh), GFP_KERNEL);
8910         return;
8911 err:
8912         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8913                           -ENOBUFS);
8914 }
8915
8916 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8917                             const struct nlattr * const nla[])
8918 {
8919         struct sk_buff *skb2;
8920         int err;
8921
8922         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8923         if (skb2 == NULL)
8924                 return -ENOMEM;
8925
8926         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8927                                       info->nlh->nlmsg_seq);
8928         if (err < 0)
8929                 goto err_fill_gen_info;
8930
8931         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8932
8933 err_fill_gen_info:
8934         kfree_skb(skb2);
8935         return err;
8936 }
8937
8938 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8939         [NFT_MSG_NEWTABLE] = {
8940                 .call           = nf_tables_newtable,
8941                 .type           = NFNL_CB_BATCH,
8942                 .attr_count     = NFTA_TABLE_MAX,
8943                 .policy         = nft_table_policy,
8944         },
8945         [NFT_MSG_GETTABLE] = {
8946                 .call           = nf_tables_gettable,
8947                 .type           = NFNL_CB_RCU,
8948                 .attr_count     = NFTA_TABLE_MAX,
8949                 .policy         = nft_table_policy,
8950         },
8951         [NFT_MSG_DELTABLE] = {
8952                 .call           = nf_tables_deltable,
8953                 .type           = NFNL_CB_BATCH,
8954                 .attr_count     = NFTA_TABLE_MAX,
8955                 .policy         = nft_table_policy,
8956         },
8957         [NFT_MSG_DESTROYTABLE] = {
8958                 .call           = nf_tables_deltable,
8959                 .type           = NFNL_CB_BATCH,
8960                 .attr_count     = NFTA_TABLE_MAX,
8961                 .policy         = nft_table_policy,
8962         },
8963         [NFT_MSG_NEWCHAIN] = {
8964                 .call           = nf_tables_newchain,
8965                 .type           = NFNL_CB_BATCH,
8966                 .attr_count     = NFTA_CHAIN_MAX,
8967                 .policy         = nft_chain_policy,
8968         },
8969         [NFT_MSG_GETCHAIN] = {
8970                 .call           = nf_tables_getchain,
8971                 .type           = NFNL_CB_RCU,
8972                 .attr_count     = NFTA_CHAIN_MAX,
8973                 .policy         = nft_chain_policy,
8974         },
8975         [NFT_MSG_DELCHAIN] = {
8976                 .call           = nf_tables_delchain,
8977                 .type           = NFNL_CB_BATCH,
8978                 .attr_count     = NFTA_CHAIN_MAX,
8979                 .policy         = nft_chain_policy,
8980         },
8981         [NFT_MSG_DESTROYCHAIN] = {
8982                 .call           = nf_tables_delchain,
8983                 .type           = NFNL_CB_BATCH,
8984                 .attr_count     = NFTA_CHAIN_MAX,
8985                 .policy         = nft_chain_policy,
8986         },
8987         [NFT_MSG_NEWRULE] = {
8988                 .call           = nf_tables_newrule,
8989                 .type           = NFNL_CB_BATCH,
8990                 .attr_count     = NFTA_RULE_MAX,
8991                 .policy         = nft_rule_policy,
8992         },
8993         [NFT_MSG_GETRULE] = {
8994                 .call           = nf_tables_getrule,
8995                 .type           = NFNL_CB_RCU,
8996                 .attr_count     = NFTA_RULE_MAX,
8997                 .policy         = nft_rule_policy,
8998         },
8999         [NFT_MSG_GETRULE_RESET] = {
9000                 .call           = nf_tables_getrule,
9001                 .type           = NFNL_CB_RCU,
9002                 .attr_count     = NFTA_RULE_MAX,
9003                 .policy         = nft_rule_policy,
9004         },
9005         [NFT_MSG_DELRULE] = {
9006                 .call           = nf_tables_delrule,
9007                 .type           = NFNL_CB_BATCH,
9008                 .attr_count     = NFTA_RULE_MAX,
9009                 .policy         = nft_rule_policy,
9010         },
9011         [NFT_MSG_DESTROYRULE] = {
9012                 .call           = nf_tables_delrule,
9013                 .type           = NFNL_CB_BATCH,
9014                 .attr_count     = NFTA_RULE_MAX,
9015                 .policy         = nft_rule_policy,
9016         },
9017         [NFT_MSG_NEWSET] = {
9018                 .call           = nf_tables_newset,
9019                 .type           = NFNL_CB_BATCH,
9020                 .attr_count     = NFTA_SET_MAX,
9021                 .policy         = nft_set_policy,
9022         },
9023         [NFT_MSG_GETSET] = {
9024                 .call           = nf_tables_getset,
9025                 .type           = NFNL_CB_RCU,
9026                 .attr_count     = NFTA_SET_MAX,
9027                 .policy         = nft_set_policy,
9028         },
9029         [NFT_MSG_DELSET] = {
9030                 .call           = nf_tables_delset,
9031                 .type           = NFNL_CB_BATCH,
9032                 .attr_count     = NFTA_SET_MAX,
9033                 .policy         = nft_set_policy,
9034         },
9035         [NFT_MSG_DESTROYSET] = {
9036                 .call           = nf_tables_delset,
9037                 .type           = NFNL_CB_BATCH,
9038                 .attr_count     = NFTA_SET_MAX,
9039                 .policy         = nft_set_policy,
9040         },
9041         [NFT_MSG_NEWSETELEM] = {
9042                 .call           = nf_tables_newsetelem,
9043                 .type           = NFNL_CB_BATCH,
9044                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9045                 .policy         = nft_set_elem_list_policy,
9046         },
9047         [NFT_MSG_GETSETELEM] = {
9048                 .call           = nf_tables_getsetelem,
9049                 .type           = NFNL_CB_RCU,
9050                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9051                 .policy         = nft_set_elem_list_policy,
9052         },
9053         [NFT_MSG_GETSETELEM_RESET] = {
9054                 .call           = nf_tables_getsetelem,
9055                 .type           = NFNL_CB_RCU,
9056                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9057                 .policy         = nft_set_elem_list_policy,
9058         },
9059         [NFT_MSG_DELSETELEM] = {
9060                 .call           = nf_tables_delsetelem,
9061                 .type           = NFNL_CB_BATCH,
9062                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9063                 .policy         = nft_set_elem_list_policy,
9064         },
9065         [NFT_MSG_DESTROYSETELEM] = {
9066                 .call           = nf_tables_delsetelem,
9067                 .type           = NFNL_CB_BATCH,
9068                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9069                 .policy         = nft_set_elem_list_policy,
9070         },
9071         [NFT_MSG_GETGEN] = {
9072                 .call           = nf_tables_getgen,
9073                 .type           = NFNL_CB_RCU,
9074         },
9075         [NFT_MSG_NEWOBJ] = {
9076                 .call           = nf_tables_newobj,
9077                 .type           = NFNL_CB_BATCH,
9078                 .attr_count     = NFTA_OBJ_MAX,
9079                 .policy         = nft_obj_policy,
9080         },
9081         [NFT_MSG_GETOBJ] = {
9082                 .call           = nf_tables_getobj,
9083                 .type           = NFNL_CB_RCU,
9084                 .attr_count     = NFTA_OBJ_MAX,
9085                 .policy         = nft_obj_policy,
9086         },
9087         [NFT_MSG_DELOBJ] = {
9088                 .call           = nf_tables_delobj,
9089                 .type           = NFNL_CB_BATCH,
9090                 .attr_count     = NFTA_OBJ_MAX,
9091                 .policy         = nft_obj_policy,
9092         },
9093         [NFT_MSG_DESTROYOBJ] = {
9094                 .call           = nf_tables_delobj,
9095                 .type           = NFNL_CB_BATCH,
9096                 .attr_count     = NFTA_OBJ_MAX,
9097                 .policy         = nft_obj_policy,
9098         },
9099         [NFT_MSG_GETOBJ_RESET] = {
9100                 .call           = nf_tables_getobj,
9101                 .type           = NFNL_CB_RCU,
9102                 .attr_count     = NFTA_OBJ_MAX,
9103                 .policy         = nft_obj_policy,
9104         },
9105         [NFT_MSG_NEWFLOWTABLE] = {
9106                 .call           = nf_tables_newflowtable,
9107                 .type           = NFNL_CB_BATCH,
9108                 .attr_count     = NFTA_FLOWTABLE_MAX,
9109                 .policy         = nft_flowtable_policy,
9110         },
9111         [NFT_MSG_GETFLOWTABLE] = {
9112                 .call           = nf_tables_getflowtable,
9113                 .type           = NFNL_CB_RCU,
9114                 .attr_count     = NFTA_FLOWTABLE_MAX,
9115                 .policy         = nft_flowtable_policy,
9116         },
9117         [NFT_MSG_DELFLOWTABLE] = {
9118                 .call           = nf_tables_delflowtable,
9119                 .type           = NFNL_CB_BATCH,
9120                 .attr_count     = NFTA_FLOWTABLE_MAX,
9121                 .policy         = nft_flowtable_policy,
9122         },
9123         [NFT_MSG_DESTROYFLOWTABLE] = {
9124                 .call           = nf_tables_delflowtable,
9125                 .type           = NFNL_CB_BATCH,
9126                 .attr_count     = NFTA_FLOWTABLE_MAX,
9127                 .policy         = nft_flowtable_policy,
9128         },
9129 };
9130
9131 static int nf_tables_validate(struct net *net)
9132 {
9133         struct nftables_pernet *nft_net = nft_pernet(net);
9134         struct nft_table *table;
9135
9136         list_for_each_entry(table, &nft_net->tables, list) {
9137                 switch (table->validate_state) {
9138                 case NFT_VALIDATE_SKIP:
9139                         continue;
9140                 case NFT_VALIDATE_NEED:
9141                         nft_validate_state_update(table, NFT_VALIDATE_DO);
9142                         fallthrough;
9143                 case NFT_VALIDATE_DO:
9144                         if (nft_table_validate(net, table) < 0)
9145                                 return -EAGAIN;
9146
9147                         nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9148                         break;
9149                 }
9150         }
9151
9152         return 0;
9153 }
9154
9155 /* a drop policy has to be deferred until all rules have been activated,
9156  * otherwise a large ruleset that contains a drop-policy base chain will
9157  * cause all packets to get dropped until the full transaction has been
9158  * processed.
9159  *
9160  * We defer the drop policy until the transaction has been finalized.
9161  */
9162 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9163 {
9164         struct nft_base_chain *basechain;
9165
9166         if (nft_trans_chain_policy(trans) != NF_DROP)
9167                 return;
9168
9169         if (!nft_is_base_chain(trans->ctx.chain))
9170                 return;
9171
9172         basechain = nft_base_chain(trans->ctx.chain);
9173         basechain->policy = NF_DROP;
9174 }
9175
9176 static void nft_chain_commit_update(struct nft_trans *trans)
9177 {
9178         struct nft_base_chain *basechain;
9179
9180         if (nft_trans_chain_name(trans)) {
9181                 rhltable_remove(&trans->ctx.table->chains_ht,
9182                                 &trans->ctx.chain->rhlhead,
9183                                 nft_chain_ht_params);
9184                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9185                 rhltable_insert_key(&trans->ctx.table->chains_ht,
9186                                     trans->ctx.chain->name,
9187                                     &trans->ctx.chain->rhlhead,
9188                                     nft_chain_ht_params);
9189         }
9190
9191         if (!nft_is_base_chain(trans->ctx.chain))
9192                 return;
9193
9194         nft_chain_stats_replace(trans);
9195
9196         basechain = nft_base_chain(trans->ctx.chain);
9197
9198         switch (nft_trans_chain_policy(trans)) {
9199         case NF_DROP:
9200         case NF_ACCEPT:
9201                 basechain->policy = nft_trans_chain_policy(trans);
9202                 break;
9203         }
9204 }
9205
9206 static void nft_obj_commit_update(struct nft_trans *trans)
9207 {
9208         struct nft_object *newobj;
9209         struct nft_object *obj;
9210
9211         obj = nft_trans_obj(trans);
9212         newobj = nft_trans_obj_newobj(trans);
9213
9214         if (obj->ops->update)
9215                 obj->ops->update(obj, newobj);
9216
9217         nft_obj_destroy(&trans->ctx, newobj);
9218 }
9219
9220 static void nft_commit_release(struct nft_trans *trans)
9221 {
9222         switch (trans->msg_type) {
9223         case NFT_MSG_DELTABLE:
9224         case NFT_MSG_DESTROYTABLE:
9225                 nf_tables_table_destroy(&trans->ctx);
9226                 break;
9227         case NFT_MSG_NEWCHAIN:
9228                 free_percpu(nft_trans_chain_stats(trans));
9229                 kfree(nft_trans_chain_name(trans));
9230                 break;
9231         case NFT_MSG_DELCHAIN:
9232         case NFT_MSG_DESTROYCHAIN:
9233                 if (nft_trans_chain_update(trans))
9234                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9235                 else
9236                         nf_tables_chain_destroy(&trans->ctx);
9237                 break;
9238         case NFT_MSG_DELRULE:
9239         case NFT_MSG_DESTROYRULE:
9240                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9241                 break;
9242         case NFT_MSG_DELSET:
9243         case NFT_MSG_DESTROYSET:
9244                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9245                 break;
9246         case NFT_MSG_DELSETELEM:
9247         case NFT_MSG_DESTROYSETELEM:
9248                 nf_tables_set_elem_destroy(&trans->ctx,
9249                                            nft_trans_elem_set(trans),
9250                                            nft_trans_elem(trans).priv);
9251                 break;
9252         case NFT_MSG_DELOBJ:
9253         case NFT_MSG_DESTROYOBJ:
9254                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9255                 break;
9256         case NFT_MSG_DELFLOWTABLE:
9257         case NFT_MSG_DESTROYFLOWTABLE:
9258                 if (nft_trans_flowtable_update(trans))
9259                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9260                 else
9261                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9262                 break;
9263         }
9264
9265         if (trans->put_net)
9266                 put_net(trans->ctx.net);
9267
9268         kfree(trans);
9269 }
9270
9271 static void nf_tables_trans_destroy_work(struct work_struct *w)
9272 {
9273         struct nft_trans *trans, *next;
9274         LIST_HEAD(head);
9275
9276         spin_lock(&nf_tables_destroy_list_lock);
9277         list_splice_init(&nf_tables_destroy_list, &head);
9278         spin_unlock(&nf_tables_destroy_list_lock);
9279
9280         if (list_empty(&head))
9281                 return;
9282
9283         synchronize_rcu();
9284
9285         list_for_each_entry_safe(trans, next, &head, list) {
9286                 nft_trans_list_del(trans);
9287                 nft_commit_release(trans);
9288         }
9289 }
9290
9291 void nf_tables_trans_destroy_flush_work(void)
9292 {
9293         flush_work(&trans_destroy_work);
9294 }
9295 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9296
9297 static bool nft_expr_reduce(struct nft_regs_track *track,
9298                             const struct nft_expr *expr)
9299 {
9300         return false;
9301 }
9302
9303 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9304 {
9305         const struct nft_expr *expr, *last;
9306         struct nft_regs_track track = {};
9307         unsigned int size, data_size;
9308         void *data, *data_boundary;
9309         struct nft_rule_dp *prule;
9310         struct nft_rule *rule;
9311
9312         /* already handled or inactive chain? */
9313         if (chain->blob_next || !nft_is_active_next(net, chain))
9314                 return 0;
9315
9316         data_size = 0;
9317         list_for_each_entry(rule, &chain->rules, list) {
9318                 if (nft_is_active_next(net, rule)) {
9319                         data_size += sizeof(*prule) + rule->dlen;
9320                         if (data_size > INT_MAX)
9321                                 return -ENOMEM;
9322                 }
9323         }
9324
9325         chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9326         if (!chain->blob_next)
9327                 return -ENOMEM;
9328
9329         data = (void *)chain->blob_next->data;
9330         data_boundary = data + data_size;
9331         size = 0;
9332
9333         list_for_each_entry(rule, &chain->rules, list) {
9334                 if (!nft_is_active_next(net, rule))
9335                         continue;
9336
9337                 prule = (struct nft_rule_dp *)data;
9338                 data += offsetof(struct nft_rule_dp, data);
9339                 if (WARN_ON_ONCE(data > data_boundary))
9340                         return -ENOMEM;
9341
9342                 size = 0;
9343                 track.last = nft_expr_last(rule);
9344                 nft_rule_for_each_expr(expr, last, rule) {
9345                         track.cur = expr;
9346
9347                         if (nft_expr_reduce(&track, expr)) {
9348                                 expr = track.cur;
9349                                 continue;
9350                         }
9351
9352                         if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9353                                 return -ENOMEM;
9354
9355                         memcpy(data + size, expr, expr->ops->size);
9356                         size += expr->ops->size;
9357                 }
9358                 if (WARN_ON_ONCE(size >= 1 << 12))
9359                         return -ENOMEM;
9360
9361                 prule->handle = rule->handle;
9362                 prule->dlen = size;
9363                 prule->is_last = 0;
9364
9365                 data += size;
9366                 size = 0;
9367                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9368         }
9369
9370         if (WARN_ON_ONCE(data > data_boundary))
9371                 return -ENOMEM;
9372
9373         prule = (struct nft_rule_dp *)data;
9374         nft_last_rule(chain, prule);
9375
9376         return 0;
9377 }
9378
9379 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9380 {
9381         struct nftables_pernet *nft_net = nft_pernet(net);
9382         struct nft_trans *trans, *next;
9383
9384         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9385                 struct nft_chain *chain = trans->ctx.chain;
9386
9387                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9388                     trans->msg_type == NFT_MSG_DELRULE) {
9389                         kvfree(chain->blob_next);
9390                         chain->blob_next = NULL;
9391                 }
9392         }
9393 }
9394
9395 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9396 {
9397         struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9398
9399         kvfree(l->blob);
9400 }
9401
9402 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9403 {
9404         struct nft_rule_dp_last *last;
9405
9406         /* last rule trailer is after end marker */
9407         last = (void *)blob + sizeof(*blob) + blob->size;
9408         last->blob = blob;
9409
9410         call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9411 }
9412
9413 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9414 {
9415         struct nft_rule_blob *g0, *g1;
9416         bool next_genbit;
9417
9418         next_genbit = nft_gencursor_next(net);
9419
9420         g0 = rcu_dereference_protected(chain->blob_gen_0,
9421                                        lockdep_commit_lock_is_held(net));
9422         g1 = rcu_dereference_protected(chain->blob_gen_1,
9423                                        lockdep_commit_lock_is_held(net));
9424
9425         /* No changes to this chain? */
9426         if (chain->blob_next == NULL) {
9427                 /* chain had no change in last or next generation */
9428                 if (g0 == g1)
9429                         return;
9430                 /*
9431                  * chain had no change in this generation; make sure next
9432                  * one uses same rules as current generation.
9433                  */
9434                 if (next_genbit) {
9435                         rcu_assign_pointer(chain->blob_gen_1, g0);
9436                         nf_tables_commit_chain_free_rules_old(g1);
9437                 } else {
9438                         rcu_assign_pointer(chain->blob_gen_0, g1);
9439                         nf_tables_commit_chain_free_rules_old(g0);
9440                 }
9441
9442                 return;
9443         }
9444
9445         if (next_genbit)
9446                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9447         else
9448                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9449
9450         chain->blob_next = NULL;
9451
9452         if (g0 == g1)
9453                 return;
9454
9455         if (next_genbit)
9456                 nf_tables_commit_chain_free_rules_old(g1);
9457         else
9458                 nf_tables_commit_chain_free_rules_old(g0);
9459 }
9460
9461 static void nft_obj_del(struct nft_object *obj)
9462 {
9463         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9464         list_del_rcu(&obj->list);
9465 }
9466
9467 void nft_chain_del(struct nft_chain *chain)
9468 {
9469         struct nft_table *table = chain->table;
9470
9471         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9472                                      nft_chain_ht_params));
9473         list_del_rcu(&chain->list);
9474 }
9475
9476 static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
9477                                         struct nft_trans_gc *trans)
9478 {
9479         void **priv = trans->priv;
9480         unsigned int i;
9481
9482         for (i = 0; i < trans->count; i++) {
9483                 struct nft_set_elem elem = {
9484                         .priv = priv[i],
9485                 };
9486
9487                 nft_setelem_data_deactivate(ctx->net, trans->set, &elem);
9488                 nft_setelem_remove(ctx->net, trans->set, &elem);
9489         }
9490 }
9491
9492 void nft_trans_gc_destroy(struct nft_trans_gc *trans)
9493 {
9494         nft_set_put(trans->set);
9495         put_net(trans->net);
9496         kfree(trans);
9497 }
9498
9499 static void nft_trans_gc_trans_free(struct rcu_head *rcu)
9500 {
9501         struct nft_set_elem elem = {};
9502         struct nft_trans_gc *trans;
9503         struct nft_ctx ctx = {};
9504         unsigned int i;
9505
9506         trans = container_of(rcu, struct nft_trans_gc, rcu);
9507         ctx.net = read_pnet(&trans->set->net);
9508
9509         for (i = 0; i < trans->count; i++) {
9510                 elem.priv = trans->priv[i];
9511                 if (!nft_setelem_is_catchall(trans->set, &elem))
9512                         atomic_dec(&trans->set->nelems);
9513
9514                 nf_tables_set_elem_destroy(&ctx, trans->set, elem.priv);
9515         }
9516
9517         nft_trans_gc_destroy(trans);
9518 }
9519
9520 static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
9521 {
9522         struct nftables_pernet *nft_net;
9523         struct nft_ctx ctx = {};
9524
9525         nft_net = nft_pernet(trans->net);
9526
9527         mutex_lock(&nft_net->commit_mutex);
9528
9529         /* Check for race with transaction, otherwise this batch refers to
9530          * stale objects that might not be there anymore. Skip transaction if
9531          * set has been destroyed from control plane transaction in case gc
9532          * worker loses race.
9533          */
9534         if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
9535                 mutex_unlock(&nft_net->commit_mutex);
9536                 return false;
9537         }
9538
9539         ctx.net = trans->net;
9540         ctx.table = trans->set->table;
9541
9542         nft_trans_gc_setelem_remove(&ctx, trans);
9543         mutex_unlock(&nft_net->commit_mutex);
9544
9545         return true;
9546 }
9547
9548 static void nft_trans_gc_work(struct work_struct *work)
9549 {
9550         struct nft_trans_gc *trans, *next;
9551         LIST_HEAD(trans_gc_list);
9552
9553         spin_lock(&nf_tables_gc_list_lock);
9554         list_splice_init(&nf_tables_gc_list, &trans_gc_list);
9555         spin_unlock(&nf_tables_gc_list_lock);
9556
9557         list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
9558                 list_del(&trans->list);
9559                 if (!nft_trans_gc_work_done(trans)) {
9560                         nft_trans_gc_destroy(trans);
9561                         continue;
9562                 }
9563                 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9564         }
9565 }
9566
9567 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
9568                                         unsigned int gc_seq, gfp_t gfp)
9569 {
9570         struct net *net = read_pnet(&set->net);
9571         struct nft_trans_gc *trans;
9572
9573         trans = kzalloc(sizeof(*trans), gfp);
9574         if (!trans)
9575                 return NULL;
9576
9577         trans->net = maybe_get_net(net);
9578         if (!trans->net) {
9579                 kfree(trans);
9580                 return NULL;
9581         }
9582
9583         refcount_inc(&set->refs);
9584         trans->set = set;
9585         trans->seq = gc_seq;
9586
9587         return trans;
9588 }
9589
9590 void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
9591 {
9592         trans->priv[trans->count++] = priv;
9593 }
9594
9595 static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
9596 {
9597         spin_lock(&nf_tables_gc_list_lock);
9598         list_add_tail(&trans->list, &nf_tables_gc_list);
9599         spin_unlock(&nf_tables_gc_list_lock);
9600
9601         schedule_work(&trans_gc_work);
9602 }
9603
9604 static int nft_trans_gc_space(struct nft_trans_gc *trans)
9605 {
9606         return NFT_TRANS_GC_BATCHCOUNT - trans->count;
9607 }
9608
9609 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
9610                                               unsigned int gc_seq, gfp_t gfp)
9611 {
9612         struct nft_set *set;
9613
9614         if (nft_trans_gc_space(gc))
9615                 return gc;
9616
9617         set = gc->set;
9618         nft_trans_gc_queue_work(gc);
9619
9620         return nft_trans_gc_alloc(set, gc_seq, gfp);
9621 }
9622
9623 void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
9624 {
9625         if (trans->count == 0) {
9626                 nft_trans_gc_destroy(trans);
9627                 return;
9628         }
9629
9630         nft_trans_gc_queue_work(trans);
9631 }
9632
9633 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
9634 {
9635         struct nft_set *set;
9636
9637         if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
9638                 return NULL;
9639
9640         if (nft_trans_gc_space(gc))
9641                 return gc;
9642
9643         set = gc->set;
9644         call_rcu(&gc->rcu, nft_trans_gc_trans_free);
9645
9646         return nft_trans_gc_alloc(set, 0, gfp);
9647 }
9648
9649 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
9650 {
9651         WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
9652
9653         if (trans->count == 0) {
9654                 nft_trans_gc_destroy(trans);
9655                 return;
9656         }
9657
9658         call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9659 }
9660
9661 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
9662                                                  unsigned int gc_seq)
9663 {
9664         struct nft_set_elem_catchall *catchall;
9665         const struct nft_set *set = gc->set;
9666         struct nft_set_ext *ext;
9667
9668         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9669                 ext = nft_set_elem_ext(set, catchall->elem);
9670
9671                 if (!nft_set_elem_expired(ext))
9672                         continue;
9673                 if (nft_set_elem_is_dead(ext))
9674                         goto dead_elem;
9675
9676                 nft_set_elem_dead(ext);
9677 dead_elem:
9678                 gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
9679                 if (!gc)
9680                         return NULL;
9681
9682                 nft_trans_gc_elem_add(gc, catchall->elem);
9683         }
9684
9685         return gc;
9686 }
9687
9688 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc)
9689 {
9690         struct nft_set_elem_catchall *catchall, *next;
9691         const struct nft_set *set = gc->set;
9692         struct nft_set_elem elem;
9693         struct nft_set_ext *ext;
9694
9695         WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net));
9696
9697         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
9698                 ext = nft_set_elem_ext(set, catchall->elem);
9699
9700                 if (!nft_set_elem_expired(ext))
9701                         continue;
9702
9703                 gc = nft_trans_gc_queue_sync(gc, GFP_KERNEL);
9704                 if (!gc)
9705                         return NULL;
9706
9707                 memset(&elem, 0, sizeof(elem));
9708                 elem.priv = catchall->elem;
9709
9710                 nft_setelem_data_deactivate(gc->net, gc->set, &elem);
9711                 nft_setelem_catchall_destroy(catchall);
9712                 nft_trans_gc_elem_add(gc, elem.priv);
9713         }
9714
9715         return gc;
9716 }
9717
9718 static void nf_tables_module_autoload_cleanup(struct net *net)
9719 {
9720         struct nftables_pernet *nft_net = nft_pernet(net);
9721         struct nft_module_request *req, *next;
9722
9723         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9724         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9725                 WARN_ON_ONCE(!req->done);
9726                 list_del(&req->list);
9727                 kfree(req);
9728         }
9729 }
9730
9731 static void nf_tables_commit_release(struct net *net)
9732 {
9733         struct nftables_pernet *nft_net = nft_pernet(net);
9734         struct nft_trans *trans;
9735
9736         /* all side effects have to be made visible.
9737          * For example, if a chain named 'foo' has been deleted, a
9738          * new transaction must not find it anymore.
9739          *
9740          * Memory reclaim happens asynchronously from work queue
9741          * to prevent expensive synchronize_rcu() in commit phase.
9742          */
9743         if (list_empty(&nft_net->commit_list)) {
9744                 nf_tables_module_autoload_cleanup(net);
9745                 mutex_unlock(&nft_net->commit_mutex);
9746                 return;
9747         }
9748
9749         trans = list_last_entry(&nft_net->commit_list,
9750                                 struct nft_trans, list);
9751         get_net(trans->ctx.net);
9752         WARN_ON_ONCE(trans->put_net);
9753
9754         trans->put_net = true;
9755         spin_lock(&nf_tables_destroy_list_lock);
9756         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9757         spin_unlock(&nf_tables_destroy_list_lock);
9758
9759         nf_tables_module_autoload_cleanup(net);
9760         schedule_work(&trans_destroy_work);
9761
9762         mutex_unlock(&nft_net->commit_mutex);
9763 }
9764
9765 static void nft_commit_notify(struct net *net, u32 portid)
9766 {
9767         struct nftables_pernet *nft_net = nft_pernet(net);
9768         struct sk_buff *batch_skb = NULL, *nskb, *skb;
9769         unsigned char *data;
9770         int len;
9771
9772         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9773                 if (!batch_skb) {
9774 new_batch:
9775                         batch_skb = skb;
9776                         len = NLMSG_GOODSIZE - skb->len;
9777                         list_del(&skb->list);
9778                         continue;
9779                 }
9780                 len -= skb->len;
9781                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9782                         data = skb_put(batch_skb, skb->len);
9783                         memcpy(data, skb->data, skb->len);
9784                         list_del(&skb->list);
9785                         kfree_skb(skb);
9786                         continue;
9787                 }
9788                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9789                                NFT_CB(batch_skb).report, GFP_KERNEL);
9790                 goto new_batch;
9791         }
9792
9793         if (batch_skb) {
9794                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9795                                NFT_CB(batch_skb).report, GFP_KERNEL);
9796         }
9797
9798         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9799 }
9800
9801 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9802                                         struct nft_table *table)
9803 {
9804         struct nft_audit_data *adp;
9805
9806         list_for_each_entry(adp, adl, list) {
9807                 if (adp->table == table)
9808                         return 0;
9809         }
9810         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9811         if (!adp)
9812                 return -ENOMEM;
9813         adp->table = table;
9814         list_add(&adp->list, adl);
9815         return 0;
9816 }
9817
9818 static void nf_tables_commit_audit_free(struct list_head *adl)
9819 {
9820         struct nft_audit_data *adp, *adn;
9821
9822         list_for_each_entry_safe(adp, adn, adl, list) {
9823                 list_del(&adp->list);
9824                 kfree(adp);
9825         }
9826 }
9827
9828 static void nf_tables_commit_audit_collect(struct list_head *adl,
9829                                            struct nft_table *table, u32 op)
9830 {
9831         struct nft_audit_data *adp;
9832
9833         list_for_each_entry(adp, adl, list) {
9834                 if (adp->table == table)
9835                         goto found;
9836         }
9837         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9838         return;
9839 found:
9840         adp->entries++;
9841         if (!adp->op || adp->op > op)
9842                 adp->op = op;
9843 }
9844
9845 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9846
9847 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9848 {
9849         struct nft_audit_data *adp, *adn;
9850         char aubuf[AUNFTABLENAMELEN];
9851
9852         list_for_each_entry_safe(adp, adn, adl, list) {
9853                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9854                          generation);
9855                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9856                                 nft2audit_op[adp->op], GFP_KERNEL);
9857                 list_del(&adp->list);
9858                 kfree(adp);
9859         }
9860 }
9861
9862 static void nft_set_commit_update(struct list_head *set_update_list)
9863 {
9864         struct nft_set *set, *next;
9865
9866         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9867                 list_del_init(&set->pending_update);
9868
9869                 if (!set->ops->commit || set->dead)
9870                         continue;
9871
9872                 set->ops->commit(set);
9873         }
9874 }
9875
9876 static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
9877 {
9878         unsigned int gc_seq;
9879
9880         /* Bump gc counter, it becomes odd, this is the busy mark. */
9881         gc_seq = READ_ONCE(nft_net->gc_seq);
9882         WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9883
9884         return gc_seq;
9885 }
9886
9887 static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
9888 {
9889         WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9890 }
9891
9892 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9893 {
9894         struct nftables_pernet *nft_net = nft_pernet(net);
9895         struct nft_trans *trans, *next;
9896         unsigned int base_seq, gc_seq;
9897         LIST_HEAD(set_update_list);
9898         struct nft_trans_elem *te;
9899         struct nft_chain *chain;
9900         struct nft_table *table;
9901         LIST_HEAD(adl);
9902         int err;
9903
9904         if (list_empty(&nft_net->commit_list)) {
9905                 mutex_unlock(&nft_net->commit_mutex);
9906                 return 0;
9907         }
9908
9909         list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
9910                 switch (trans->msg_type) {
9911                 case NFT_MSG_NEWSET:
9912                         if (!nft_trans_set_update(trans) &&
9913                             nft_set_is_anonymous(nft_trans_set(trans)) &&
9914                             !nft_trans_set_bound(trans)) {
9915                                 pr_warn_once("nftables ruleset with unbound set\n");
9916                                 return -EINVAL;
9917                         }
9918                         break;
9919                 case NFT_MSG_NEWCHAIN:
9920                         if (!nft_trans_chain_update(trans) &&
9921                             nft_chain_binding(nft_trans_chain(trans)) &&
9922                             !nft_trans_chain_bound(trans)) {
9923                                 pr_warn_once("nftables ruleset with unbound chain\n");
9924                                 return -EINVAL;
9925                         }
9926                         break;
9927                 }
9928         }
9929
9930         /* 0. Validate ruleset, otherwise roll back for error reporting. */
9931         if (nf_tables_validate(net) < 0) {
9932                 nft_net->validate_state = NFT_VALIDATE_DO;
9933                 return -EAGAIN;
9934         }
9935
9936         err = nft_flow_rule_offload_commit(net);
9937         if (err < 0)
9938                 return err;
9939
9940         /* 1.  Allocate space for next generation rules_gen_X[] */
9941         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9942                 int ret;
9943
9944                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9945                 if (ret) {
9946                         nf_tables_commit_chain_prepare_cancel(net);
9947                         nf_tables_commit_audit_free(&adl);
9948                         return ret;
9949                 }
9950                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9951                     trans->msg_type == NFT_MSG_DELRULE) {
9952                         chain = trans->ctx.chain;
9953
9954                         ret = nf_tables_commit_chain_prepare(net, chain);
9955                         if (ret < 0) {
9956                                 nf_tables_commit_chain_prepare_cancel(net);
9957                                 nf_tables_commit_audit_free(&adl);
9958                                 return ret;
9959                         }
9960                 }
9961         }
9962
9963         /* step 2.  Make rules_gen_X visible to packet path */
9964         list_for_each_entry(table, &nft_net->tables, list) {
9965                 list_for_each_entry(chain, &table->chains, list)
9966                         nf_tables_commit_chain(net, chain);
9967         }
9968
9969         /*
9970          * Bump generation counter, invalidate any dump in progress.
9971          * Cannot fail after this point.
9972          */
9973         base_seq = READ_ONCE(nft_net->base_seq);
9974         while (++base_seq == 0)
9975                 ;
9976
9977         WRITE_ONCE(nft_net->base_seq, base_seq);
9978
9979         gc_seq = nft_gc_seq_begin(nft_net);
9980
9981         /* step 3. Start new generation, rules_gen_X now in use. */
9982         net->nft.gencursor = nft_gencursor_next(net);
9983
9984         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9985                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9986                                                trans->msg_type);
9987                 switch (trans->msg_type) {
9988                 case NFT_MSG_NEWTABLE:
9989                         if (nft_trans_table_update(trans)) {
9990                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9991                                         nft_trans_destroy(trans);
9992                                         break;
9993                                 }
9994                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9995                                         nf_tables_table_disable(net, trans->ctx.table);
9996
9997                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9998                         } else {
9999                                 nft_clear(net, trans->ctx.table);
10000                         }
10001                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
10002                         nft_trans_destroy(trans);
10003                         break;
10004                 case NFT_MSG_DELTABLE:
10005                 case NFT_MSG_DESTROYTABLE:
10006                         list_del_rcu(&trans->ctx.table->list);
10007                         nf_tables_table_notify(&trans->ctx, trans->msg_type);
10008                         break;
10009                 case NFT_MSG_NEWCHAIN:
10010                         if (nft_trans_chain_update(trans)) {
10011                                 nft_chain_commit_update(trans);
10012                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
10013                                                        &nft_trans_chain_hooks(trans));
10014                                 list_splice(&nft_trans_chain_hooks(trans),
10015                                             &nft_trans_basechain(trans)->hook_list);
10016                                 /* trans destroyed after rcu grace period */
10017                         } else {
10018                                 nft_chain_commit_drop_policy(trans);
10019                                 nft_clear(net, trans->ctx.chain);
10020                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
10021                                 nft_trans_destroy(trans);
10022                         }
10023                         break;
10024                 case NFT_MSG_DELCHAIN:
10025                 case NFT_MSG_DESTROYCHAIN:
10026                         if (nft_trans_chain_update(trans)) {
10027                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10028                                                        &nft_trans_chain_hooks(trans));
10029                                 nft_netdev_unregister_hooks(net,
10030                                                             &nft_trans_chain_hooks(trans),
10031                                                             true);
10032                         } else {
10033                                 nft_chain_del(trans->ctx.chain);
10034                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10035                                                        NULL);
10036                                 nf_tables_unregister_hook(trans->ctx.net,
10037                                                           trans->ctx.table,
10038                                                           trans->ctx.chain);
10039                         }
10040                         break;
10041                 case NFT_MSG_NEWRULE:
10042                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
10043                         nf_tables_rule_notify(&trans->ctx,
10044                                               nft_trans_rule(trans),
10045                                               NFT_MSG_NEWRULE);
10046                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10047                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10048
10049                         nft_trans_destroy(trans);
10050                         break;
10051                 case NFT_MSG_DELRULE:
10052                 case NFT_MSG_DESTROYRULE:
10053                         list_del_rcu(&nft_trans_rule(trans)->list);
10054                         nf_tables_rule_notify(&trans->ctx,
10055                                               nft_trans_rule(trans),
10056                                               trans->msg_type);
10057                         nft_rule_expr_deactivate(&trans->ctx,
10058                                                  nft_trans_rule(trans),
10059                                                  NFT_TRANS_COMMIT);
10060
10061                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10062                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10063                         break;
10064                 case NFT_MSG_NEWSET:
10065                         if (nft_trans_set_update(trans)) {
10066                                 struct nft_set *set = nft_trans_set(trans);
10067
10068                                 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
10069                                 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
10070
10071                                 if (nft_trans_set_size(trans))
10072                                         WRITE_ONCE(set->size, nft_trans_set_size(trans));
10073                         } else {
10074                                 nft_clear(net, nft_trans_set(trans));
10075                                 /* This avoids hitting -EBUSY when deleting the table
10076                                  * from the transaction.
10077                                  */
10078                                 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
10079                                     !list_empty(&nft_trans_set(trans)->bindings))
10080                                         nft_use_dec(&trans->ctx.table->use);
10081                         }
10082                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10083                                              NFT_MSG_NEWSET, GFP_KERNEL);
10084                         nft_trans_destroy(trans);
10085                         break;
10086                 case NFT_MSG_DELSET:
10087                 case NFT_MSG_DESTROYSET:
10088                         nft_trans_set(trans)->dead = 1;
10089                         list_del_rcu(&nft_trans_set(trans)->list);
10090                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10091                                              trans->msg_type, GFP_KERNEL);
10092                         break;
10093                 case NFT_MSG_NEWSETELEM:
10094                         te = (struct nft_trans_elem *)trans->data;
10095
10096                         nft_setelem_activate(net, te->set, &te->elem);
10097                         nf_tables_setelem_notify(&trans->ctx, te->set,
10098                                                  &te->elem,
10099                                                  NFT_MSG_NEWSETELEM);
10100                         if (te->set->ops->commit &&
10101                             list_empty(&te->set->pending_update)) {
10102                                 list_add_tail(&te->set->pending_update,
10103                                               &set_update_list);
10104                         }
10105                         nft_trans_destroy(trans);
10106                         break;
10107                 case NFT_MSG_DELSETELEM:
10108                 case NFT_MSG_DESTROYSETELEM:
10109                         te = (struct nft_trans_elem *)trans->data;
10110
10111                         nf_tables_setelem_notify(&trans->ctx, te->set,
10112                                                  &te->elem,
10113                                                  trans->msg_type);
10114                         nft_setelem_remove(net, te->set, &te->elem);
10115                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
10116                                 atomic_dec(&te->set->nelems);
10117                                 te->set->ndeact--;
10118                         }
10119                         if (te->set->ops->commit &&
10120                             list_empty(&te->set->pending_update)) {
10121                                 list_add_tail(&te->set->pending_update,
10122                                               &set_update_list);
10123                         }
10124                         break;
10125                 case NFT_MSG_NEWOBJ:
10126                         if (nft_trans_obj_update(trans)) {
10127                                 nft_obj_commit_update(trans);
10128                                 nf_tables_obj_notify(&trans->ctx,
10129                                                      nft_trans_obj(trans),
10130                                                      NFT_MSG_NEWOBJ);
10131                         } else {
10132                                 nft_clear(net, nft_trans_obj(trans));
10133                                 nf_tables_obj_notify(&trans->ctx,
10134                                                      nft_trans_obj(trans),
10135                                                      NFT_MSG_NEWOBJ);
10136                                 nft_trans_destroy(trans);
10137                         }
10138                         break;
10139                 case NFT_MSG_DELOBJ:
10140                 case NFT_MSG_DESTROYOBJ:
10141                         nft_obj_del(nft_trans_obj(trans));
10142                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
10143                                              trans->msg_type);
10144                         break;
10145                 case NFT_MSG_NEWFLOWTABLE:
10146                         if (nft_trans_flowtable_update(trans)) {
10147                                 nft_trans_flowtable(trans)->data.flags =
10148                                         nft_trans_flowtable_flags(trans);
10149                                 nf_tables_flowtable_notify(&trans->ctx,
10150                                                            nft_trans_flowtable(trans),
10151                                                            &nft_trans_flowtable_hooks(trans),
10152                                                            NFT_MSG_NEWFLOWTABLE);
10153                                 list_splice(&nft_trans_flowtable_hooks(trans),
10154                                             &nft_trans_flowtable(trans)->hook_list);
10155                         } else {
10156                                 nft_clear(net, nft_trans_flowtable(trans));
10157                                 nf_tables_flowtable_notify(&trans->ctx,
10158                                                            nft_trans_flowtable(trans),
10159                                                            NULL,
10160                                                            NFT_MSG_NEWFLOWTABLE);
10161                         }
10162                         nft_trans_destroy(trans);
10163                         break;
10164                 case NFT_MSG_DELFLOWTABLE:
10165                 case NFT_MSG_DESTROYFLOWTABLE:
10166                         if (nft_trans_flowtable_update(trans)) {
10167                                 nf_tables_flowtable_notify(&trans->ctx,
10168                                                            nft_trans_flowtable(trans),
10169                                                            &nft_trans_flowtable_hooks(trans),
10170                                                            trans->msg_type);
10171                                 nft_unregister_flowtable_net_hooks(net,
10172                                                                    &nft_trans_flowtable_hooks(trans));
10173                         } else {
10174                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10175                                 nf_tables_flowtable_notify(&trans->ctx,
10176                                                            nft_trans_flowtable(trans),
10177                                                            NULL,
10178                                                            trans->msg_type);
10179                                 nft_unregister_flowtable_net_hooks(net,
10180                                                 &nft_trans_flowtable(trans)->hook_list);
10181                         }
10182                         break;
10183                 }
10184         }
10185
10186         nft_set_commit_update(&set_update_list);
10187
10188         nft_commit_notify(net, NETLINK_CB(skb).portid);
10189         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
10190         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
10191
10192         nft_gc_seq_end(nft_net, gc_seq);
10193         nft_net->validate_state = NFT_VALIDATE_SKIP;
10194         nf_tables_commit_release(net);
10195
10196         return 0;
10197 }
10198
10199 static void nf_tables_module_autoload(struct net *net)
10200 {
10201         struct nftables_pernet *nft_net = nft_pernet(net);
10202         struct nft_module_request *req, *next;
10203         LIST_HEAD(module_list);
10204
10205         list_splice_init(&nft_net->module_list, &module_list);
10206         mutex_unlock(&nft_net->commit_mutex);
10207         list_for_each_entry_safe(req, next, &module_list, list) {
10208                 request_module("%s", req->module);
10209                 req->done = true;
10210         }
10211         mutex_lock(&nft_net->commit_mutex);
10212         list_splice(&module_list, &nft_net->module_list);
10213 }
10214
10215 static void nf_tables_abort_release(struct nft_trans *trans)
10216 {
10217         switch (trans->msg_type) {
10218         case NFT_MSG_NEWTABLE:
10219                 nf_tables_table_destroy(&trans->ctx);
10220                 break;
10221         case NFT_MSG_NEWCHAIN:
10222                 if (nft_trans_chain_update(trans))
10223                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
10224                 else
10225                         nf_tables_chain_destroy(&trans->ctx);
10226                 break;
10227         case NFT_MSG_NEWRULE:
10228                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
10229                 break;
10230         case NFT_MSG_NEWSET:
10231                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
10232                 break;
10233         case NFT_MSG_NEWSETELEM:
10234                 nft_set_elem_destroy(nft_trans_elem_set(trans),
10235                                      nft_trans_elem(trans).priv, true);
10236                 break;
10237         case NFT_MSG_NEWOBJ:
10238                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
10239                 break;
10240         case NFT_MSG_NEWFLOWTABLE:
10241                 if (nft_trans_flowtable_update(trans))
10242                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
10243                 else
10244                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
10245                 break;
10246         }
10247         kfree(trans);
10248 }
10249
10250 static void nft_set_abort_update(struct list_head *set_update_list)
10251 {
10252         struct nft_set *set, *next;
10253
10254         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10255                 list_del_init(&set->pending_update);
10256
10257                 if (!set->ops->abort)
10258                         continue;
10259
10260                 set->ops->abort(set);
10261         }
10262 }
10263
10264 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
10265 {
10266         struct nftables_pernet *nft_net = nft_pernet(net);
10267         struct nft_trans *trans, *next;
10268         LIST_HEAD(set_update_list);
10269         struct nft_trans_elem *te;
10270
10271         if (action == NFNL_ABORT_VALIDATE &&
10272             nf_tables_validate(net) < 0)
10273                 return -EAGAIN;
10274
10275         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
10276                                          list) {
10277                 switch (trans->msg_type) {
10278                 case NFT_MSG_NEWTABLE:
10279                         if (nft_trans_table_update(trans)) {
10280                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10281                                         nft_trans_destroy(trans);
10282                                         break;
10283                                 }
10284                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
10285                                         nf_tables_table_disable(net, trans->ctx.table);
10286                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
10287                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
10288                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
10289                                 }
10290                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10291                                 nft_trans_destroy(trans);
10292                         } else {
10293                                 list_del_rcu(&trans->ctx.table->list);
10294                         }
10295                         break;
10296                 case NFT_MSG_DELTABLE:
10297                 case NFT_MSG_DESTROYTABLE:
10298                         nft_clear(trans->ctx.net, trans->ctx.table);
10299                         nft_trans_destroy(trans);
10300                         break;
10301                 case NFT_MSG_NEWCHAIN:
10302                         if (nft_trans_chain_update(trans)) {
10303                                 nft_netdev_unregister_hooks(net,
10304                                                             &nft_trans_chain_hooks(trans),
10305                                                             true);
10306                                 free_percpu(nft_trans_chain_stats(trans));
10307                                 kfree(nft_trans_chain_name(trans));
10308                                 nft_trans_destroy(trans);
10309                         } else {
10310                                 if (nft_trans_chain_bound(trans)) {
10311                                         nft_trans_destroy(trans);
10312                                         break;
10313                                 }
10314                                 nft_use_dec_restore(&trans->ctx.table->use);
10315                                 nft_chain_del(trans->ctx.chain);
10316                                 nf_tables_unregister_hook(trans->ctx.net,
10317                                                           trans->ctx.table,
10318                                                           trans->ctx.chain);
10319                         }
10320                         break;
10321                 case NFT_MSG_DELCHAIN:
10322                 case NFT_MSG_DESTROYCHAIN:
10323                         if (nft_trans_chain_update(trans)) {
10324                                 list_splice(&nft_trans_chain_hooks(trans),
10325                                             &nft_trans_basechain(trans)->hook_list);
10326                         } else {
10327                                 nft_use_inc_restore(&trans->ctx.table->use);
10328                                 nft_clear(trans->ctx.net, trans->ctx.chain);
10329                         }
10330                         nft_trans_destroy(trans);
10331                         break;
10332                 case NFT_MSG_NEWRULE:
10333                         if (nft_trans_rule_bound(trans)) {
10334                                 nft_trans_destroy(trans);
10335                                 break;
10336                         }
10337                         nft_use_dec_restore(&trans->ctx.chain->use);
10338                         list_del_rcu(&nft_trans_rule(trans)->list);
10339                         nft_rule_expr_deactivate(&trans->ctx,
10340                                                  nft_trans_rule(trans),
10341                                                  NFT_TRANS_ABORT);
10342                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10343                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10344                         break;
10345                 case NFT_MSG_DELRULE:
10346                 case NFT_MSG_DESTROYRULE:
10347                         nft_use_inc_restore(&trans->ctx.chain->use);
10348                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
10349                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10350                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10351                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10352
10353                         nft_trans_destroy(trans);
10354                         break;
10355                 case NFT_MSG_NEWSET:
10356                         if (nft_trans_set_update(trans)) {
10357                                 nft_trans_destroy(trans);
10358                                 break;
10359                         }
10360                         nft_use_dec_restore(&trans->ctx.table->use);
10361                         if (nft_trans_set_bound(trans)) {
10362                                 nft_trans_destroy(trans);
10363                                 break;
10364                         }
10365                         nft_trans_set(trans)->dead = 1;
10366                         list_del_rcu(&nft_trans_set(trans)->list);
10367                         break;
10368                 case NFT_MSG_DELSET:
10369                 case NFT_MSG_DESTROYSET:
10370                         nft_use_inc_restore(&trans->ctx.table->use);
10371                         nft_clear(trans->ctx.net, nft_trans_set(trans));
10372                         if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10373                                 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10374
10375                         nft_trans_destroy(trans);
10376                         break;
10377                 case NFT_MSG_NEWSETELEM:
10378                         if (nft_trans_elem_set_bound(trans)) {
10379                                 nft_trans_destroy(trans);
10380                                 break;
10381                         }
10382                         te = (struct nft_trans_elem *)trans->data;
10383                         nft_setelem_remove(net, te->set, &te->elem);
10384                         if (!nft_setelem_is_catchall(te->set, &te->elem))
10385                                 atomic_dec(&te->set->nelems);
10386
10387                         if (te->set->ops->abort &&
10388                             list_empty(&te->set->pending_update)) {
10389                                 list_add_tail(&te->set->pending_update,
10390                                               &set_update_list);
10391                         }
10392                         break;
10393                 case NFT_MSG_DELSETELEM:
10394                 case NFT_MSG_DESTROYSETELEM:
10395                         te = (struct nft_trans_elem *)trans->data;
10396
10397                         nft_setelem_data_activate(net, te->set, &te->elem);
10398                         nft_setelem_activate(net, te->set, &te->elem);
10399                         if (!nft_setelem_is_catchall(te->set, &te->elem))
10400                                 te->set->ndeact--;
10401
10402                         if (te->set->ops->abort &&
10403                             list_empty(&te->set->pending_update)) {
10404                                 list_add_tail(&te->set->pending_update,
10405                                               &set_update_list);
10406                         }
10407                         nft_trans_destroy(trans);
10408                         break;
10409                 case NFT_MSG_NEWOBJ:
10410                         if (nft_trans_obj_update(trans)) {
10411                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10412                                 nft_trans_destroy(trans);
10413                         } else {
10414                                 nft_use_dec_restore(&trans->ctx.table->use);
10415                                 nft_obj_del(nft_trans_obj(trans));
10416                         }
10417                         break;
10418                 case NFT_MSG_DELOBJ:
10419                 case NFT_MSG_DESTROYOBJ:
10420                         nft_use_inc_restore(&trans->ctx.table->use);
10421                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
10422                         nft_trans_destroy(trans);
10423                         break;
10424                 case NFT_MSG_NEWFLOWTABLE:
10425                         if (nft_trans_flowtable_update(trans)) {
10426                                 nft_unregister_flowtable_net_hooks(net,
10427                                                 &nft_trans_flowtable_hooks(trans));
10428                         } else {
10429                                 nft_use_dec_restore(&trans->ctx.table->use);
10430                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10431                                 nft_unregister_flowtable_net_hooks(net,
10432                                                 &nft_trans_flowtable(trans)->hook_list);
10433                         }
10434                         break;
10435                 case NFT_MSG_DELFLOWTABLE:
10436                 case NFT_MSG_DESTROYFLOWTABLE:
10437                         if (nft_trans_flowtable_update(trans)) {
10438                                 list_splice(&nft_trans_flowtable_hooks(trans),
10439                                             &nft_trans_flowtable(trans)->hook_list);
10440                         } else {
10441                                 nft_use_inc_restore(&trans->ctx.table->use);
10442                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10443                         }
10444                         nft_trans_destroy(trans);
10445                         break;
10446                 }
10447         }
10448
10449         nft_set_abort_update(&set_update_list);
10450
10451         synchronize_rcu();
10452
10453         list_for_each_entry_safe_reverse(trans, next,
10454                                          &nft_net->commit_list, list) {
10455                 nft_trans_list_del(trans);
10456                 nf_tables_abort_release(trans);
10457         }
10458
10459         if (action == NFNL_ABORT_AUTOLOAD)
10460                 nf_tables_module_autoload(net);
10461         else
10462                 nf_tables_module_autoload_cleanup(net);
10463
10464         return 0;
10465 }
10466
10467 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10468                            enum nfnl_abort_action action)
10469 {
10470         struct nftables_pernet *nft_net = nft_pernet(net);
10471         unsigned int gc_seq;
10472         int ret;
10473
10474         gc_seq = nft_gc_seq_begin(nft_net);
10475         ret = __nf_tables_abort(net, action);
10476         nft_gc_seq_end(nft_net, gc_seq);
10477         mutex_unlock(&nft_net->commit_mutex);
10478
10479         return ret;
10480 }
10481
10482 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10483 {
10484         struct nftables_pernet *nft_net = nft_pernet(net);
10485         bool genid_ok;
10486
10487         mutex_lock(&nft_net->commit_mutex);
10488
10489         genid_ok = genid == 0 || nft_net->base_seq == genid;
10490         if (!genid_ok)
10491                 mutex_unlock(&nft_net->commit_mutex);
10492
10493         /* else, commit mutex has to be released by commit or abort function */
10494         return genid_ok;
10495 }
10496
10497 static const struct nfnetlink_subsystem nf_tables_subsys = {
10498         .name           = "nf_tables",
10499         .subsys_id      = NFNL_SUBSYS_NFTABLES,
10500         .cb_count       = NFT_MSG_MAX,
10501         .cb             = nf_tables_cb,
10502         .commit         = nf_tables_commit,
10503         .abort          = nf_tables_abort,
10504         .valid_genid    = nf_tables_valid_genid,
10505         .owner          = THIS_MODULE,
10506 };
10507
10508 int nft_chain_validate_dependency(const struct nft_chain *chain,
10509                                   enum nft_chain_types type)
10510 {
10511         const struct nft_base_chain *basechain;
10512
10513         if (nft_is_base_chain(chain)) {
10514                 basechain = nft_base_chain(chain);
10515                 if (basechain->type->type != type)
10516                         return -EOPNOTSUPP;
10517         }
10518         return 0;
10519 }
10520 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10521
10522 int nft_chain_validate_hooks(const struct nft_chain *chain,
10523                              unsigned int hook_flags)
10524 {
10525         struct nft_base_chain *basechain;
10526
10527         if (nft_is_base_chain(chain)) {
10528                 basechain = nft_base_chain(chain);
10529
10530                 if ((1 << basechain->ops.hooknum) & hook_flags)
10531                         return 0;
10532
10533                 return -EOPNOTSUPP;
10534         }
10535
10536         return 0;
10537 }
10538 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10539
10540 /*
10541  * Loop detection - walk through the ruleset beginning at the destination chain
10542  * of a new jump until either the source chain is reached (loop) or all
10543  * reachable chains have been traversed.
10544  *
10545  * The loop check is performed whenever a new jump verdict is added to an
10546  * expression or verdict map or a verdict map is bound to a new chain.
10547  */
10548
10549 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10550                                  const struct nft_chain *chain);
10551
10552 static int nft_check_loops(const struct nft_ctx *ctx,
10553                            const struct nft_set_ext *ext)
10554 {
10555         const struct nft_data *data;
10556         int ret;
10557
10558         data = nft_set_ext_data(ext);
10559         switch (data->verdict.code) {
10560         case NFT_JUMP:
10561         case NFT_GOTO:
10562                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10563                 break;
10564         default:
10565                 ret = 0;
10566                 break;
10567         }
10568
10569         return ret;
10570 }
10571
10572 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10573                                         struct nft_set *set,
10574                                         const struct nft_set_iter *iter,
10575                                         struct nft_set_elem *elem)
10576 {
10577         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
10578
10579         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10580             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10581                 return 0;
10582
10583         return nft_check_loops(ctx, ext);
10584 }
10585
10586 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10587                                   struct nft_set *set)
10588 {
10589         u8 genmask = nft_genmask_next(ctx->net);
10590         struct nft_set_elem_catchall *catchall;
10591         struct nft_set_ext *ext;
10592         int ret = 0;
10593
10594         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10595                 ext = nft_set_elem_ext(set, catchall->elem);
10596                 if (!nft_set_elem_active(ext, genmask))
10597                         continue;
10598
10599                 ret = nft_check_loops(ctx, ext);
10600                 if (ret < 0)
10601                         return ret;
10602         }
10603
10604         return ret;
10605 }
10606
10607 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10608                                  const struct nft_chain *chain)
10609 {
10610         const struct nft_rule *rule;
10611         const struct nft_expr *expr, *last;
10612         struct nft_set *set;
10613         struct nft_set_binding *binding;
10614         struct nft_set_iter iter;
10615
10616         if (ctx->chain == chain)
10617                 return -ELOOP;
10618
10619         if (fatal_signal_pending(current))
10620                 return -EINTR;
10621
10622         list_for_each_entry(rule, &chain->rules, list) {
10623                 nft_rule_for_each_expr(expr, last, rule) {
10624                         struct nft_immediate_expr *priv;
10625                         const struct nft_data *data;
10626                         int err;
10627
10628                         if (strcmp(expr->ops->type->name, "immediate"))
10629                                 continue;
10630
10631                         priv = nft_expr_priv(expr);
10632                         if (priv->dreg != NFT_REG_VERDICT)
10633                                 continue;
10634
10635                         data = &priv->data;
10636                         switch (data->verdict.code) {
10637                         case NFT_JUMP:
10638                         case NFT_GOTO:
10639                                 err = nf_tables_check_loops(ctx,
10640                                                         data->verdict.chain);
10641                                 if (err < 0)
10642                                         return err;
10643                                 break;
10644                         default:
10645                                 break;
10646                         }
10647                 }
10648         }
10649
10650         list_for_each_entry(set, &ctx->table->sets, list) {
10651                 if (!nft_is_active_next(ctx->net, set))
10652                         continue;
10653                 if (!(set->flags & NFT_SET_MAP) ||
10654                     set->dtype != NFT_DATA_VERDICT)
10655                         continue;
10656
10657                 list_for_each_entry(binding, &set->bindings, list) {
10658                         if (!(binding->flags & NFT_SET_MAP) ||
10659                             binding->chain != chain)
10660                                 continue;
10661
10662                         iter.genmask    = nft_genmask_next(ctx->net);
10663                         iter.skip       = 0;
10664                         iter.count      = 0;
10665                         iter.err        = 0;
10666                         iter.fn         = nf_tables_loop_check_setelem;
10667
10668                         set->ops->walk(ctx, set, &iter);
10669                         if (!iter.err)
10670                                 iter.err = nft_set_catchall_loops(ctx, set);
10671
10672                         if (iter.err < 0)
10673                                 return iter.err;
10674                 }
10675         }
10676
10677         return 0;
10678 }
10679
10680 /**
10681  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
10682  *
10683  *      @attr: netlink attribute to fetch value from
10684  *      @max: maximum value to be stored in dest
10685  *      @dest: pointer to the variable
10686  *
10687  *      Parse, check and store a given u32 netlink attribute into variable.
10688  *      This function returns -ERANGE if the value goes over maximum value.
10689  *      Otherwise a 0 is returned and the attribute value is stored in the
10690  *      destination variable.
10691  */
10692 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10693 {
10694         u32 val;
10695
10696         val = ntohl(nla_get_be32(attr));
10697         if (val > max)
10698                 return -ERANGE;
10699
10700         *dest = val;
10701         return 0;
10702 }
10703 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10704
10705 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10706 {
10707         unsigned int reg;
10708
10709         reg = ntohl(nla_get_be32(attr));
10710         switch (reg) {
10711         case NFT_REG_VERDICT...NFT_REG_4:
10712                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10713                 break;
10714         case NFT_REG32_00...NFT_REG32_15:
10715                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10716                 break;
10717         default:
10718                 return -ERANGE;
10719         }
10720
10721         return 0;
10722 }
10723
10724 /**
10725  *      nft_dump_register - dump a register value to a netlink attribute
10726  *
10727  *      @skb: socket buffer
10728  *      @attr: attribute number
10729  *      @reg: register number
10730  *
10731  *      Construct a netlink attribute containing the register number. For
10732  *      compatibility reasons, register numbers being a multiple of 4 are
10733  *      translated to the corresponding 128 bit register numbers.
10734  */
10735 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10736 {
10737         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10738                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10739         else
10740                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10741
10742         return nla_put_be32(skb, attr, htonl(reg));
10743 }
10744 EXPORT_SYMBOL_GPL(nft_dump_register);
10745
10746 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10747 {
10748         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10749                 return -EINVAL;
10750         if (len == 0)
10751                 return -EINVAL;
10752         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10753                 return -ERANGE;
10754
10755         return 0;
10756 }
10757
10758 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10759 {
10760         u32 reg;
10761         int err;
10762
10763         err = nft_parse_register(attr, &reg);
10764         if (err < 0)
10765                 return err;
10766
10767         err = nft_validate_register_load(reg, len);
10768         if (err < 0)
10769                 return err;
10770
10771         *sreg = reg;
10772         return 0;
10773 }
10774 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10775
10776 static int nft_validate_register_store(const struct nft_ctx *ctx,
10777                                        enum nft_registers reg,
10778                                        const struct nft_data *data,
10779                                        enum nft_data_types type,
10780                                        unsigned int len)
10781 {
10782         int err;
10783
10784         switch (reg) {
10785         case NFT_REG_VERDICT:
10786                 if (type != NFT_DATA_VERDICT)
10787                         return -EINVAL;
10788
10789                 if (data != NULL &&
10790                     (data->verdict.code == NFT_GOTO ||
10791                      data->verdict.code == NFT_JUMP)) {
10792                         err = nf_tables_check_loops(ctx, data->verdict.chain);
10793                         if (err < 0)
10794                                 return err;
10795                 }
10796
10797                 return 0;
10798         default:
10799                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10800                         return -EINVAL;
10801                 if (len == 0)
10802                         return -EINVAL;
10803                 if (reg * NFT_REG32_SIZE + len >
10804                     sizeof_field(struct nft_regs, data))
10805                         return -ERANGE;
10806
10807                 if (data != NULL && type != NFT_DATA_VALUE)
10808                         return -EINVAL;
10809                 return 0;
10810         }
10811 }
10812
10813 int nft_parse_register_store(const struct nft_ctx *ctx,
10814                              const struct nlattr *attr, u8 *dreg,
10815                              const struct nft_data *data,
10816                              enum nft_data_types type, unsigned int len)
10817 {
10818         int err;
10819         u32 reg;
10820
10821         err = nft_parse_register(attr, &reg);
10822         if (err < 0)
10823                 return err;
10824
10825         err = nft_validate_register_store(ctx, reg, data, type, len);
10826         if (err < 0)
10827                 return err;
10828
10829         *dreg = reg;
10830         return 0;
10831 }
10832 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10833
10834 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10835         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
10836         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
10837                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
10838         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10839 };
10840
10841 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10842                             struct nft_data_desc *desc, const struct nlattr *nla)
10843 {
10844         u8 genmask = nft_genmask_next(ctx->net);
10845         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10846         struct nft_chain *chain;
10847         int err;
10848
10849         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10850                                           nft_verdict_policy, NULL);
10851         if (err < 0)
10852                 return err;
10853
10854         if (!tb[NFTA_VERDICT_CODE])
10855                 return -EINVAL;
10856
10857         /* zero padding hole for memcmp */
10858         memset(data, 0, sizeof(*data));
10859         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10860
10861         switch (data->verdict.code) {
10862         default:
10863                 switch (data->verdict.code & NF_VERDICT_MASK) {
10864                 case NF_ACCEPT:
10865                 case NF_DROP:
10866                 case NF_QUEUE:
10867                         break;
10868                 default:
10869                         return -EINVAL;
10870                 }
10871                 fallthrough;
10872         case NFT_CONTINUE:
10873         case NFT_BREAK:
10874         case NFT_RETURN:
10875                 break;
10876         case NFT_JUMP:
10877         case NFT_GOTO:
10878                 if (tb[NFTA_VERDICT_CHAIN]) {
10879                         chain = nft_chain_lookup(ctx->net, ctx->table,
10880                                                  tb[NFTA_VERDICT_CHAIN],
10881                                                  genmask);
10882                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10883                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10884                                                       tb[NFTA_VERDICT_CHAIN_ID],
10885                                                       genmask);
10886                         if (IS_ERR(chain))
10887                                 return PTR_ERR(chain);
10888                 } else {
10889                         return -EINVAL;
10890                 }
10891
10892                 if (IS_ERR(chain))
10893                         return PTR_ERR(chain);
10894                 if (nft_is_base_chain(chain))
10895                         return -EOPNOTSUPP;
10896                 if (nft_chain_is_bound(chain))
10897                         return -EINVAL;
10898                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10899                     chain->flags & NFT_CHAIN_BINDING)
10900                         return -EINVAL;
10901                 if (!nft_use_inc(&chain->use))
10902                         return -EMFILE;
10903
10904                 data->verdict.chain = chain;
10905                 break;
10906         }
10907
10908         desc->len = sizeof(data->verdict);
10909
10910         return 0;
10911 }
10912
10913 static void nft_verdict_uninit(const struct nft_data *data)
10914 {
10915         struct nft_chain *chain;
10916
10917         switch (data->verdict.code) {
10918         case NFT_JUMP:
10919         case NFT_GOTO:
10920                 chain = data->verdict.chain;
10921                 nft_use_dec(&chain->use);
10922                 break;
10923         }
10924 }
10925
10926 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10927 {
10928         struct nlattr *nest;
10929
10930         nest = nla_nest_start_noflag(skb, type);
10931         if (!nest)
10932                 goto nla_put_failure;
10933
10934         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10935                 goto nla_put_failure;
10936
10937         switch (v->code) {
10938         case NFT_JUMP:
10939         case NFT_GOTO:
10940                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10941                                    v->chain->name))
10942                         goto nla_put_failure;
10943         }
10944         nla_nest_end(skb, nest);
10945         return 0;
10946
10947 nla_put_failure:
10948         return -1;
10949 }
10950
10951 static int nft_value_init(const struct nft_ctx *ctx,
10952                           struct nft_data *data, struct nft_data_desc *desc,
10953                           const struct nlattr *nla)
10954 {
10955         unsigned int len;
10956
10957         len = nla_len(nla);
10958         if (len == 0)
10959                 return -EINVAL;
10960         if (len > desc->size)
10961                 return -EOVERFLOW;
10962         if (desc->len) {
10963                 if (len != desc->len)
10964                         return -EINVAL;
10965         } else {
10966                 desc->len = len;
10967         }
10968
10969         nla_memcpy(data->data, nla, len);
10970
10971         return 0;
10972 }
10973
10974 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10975                           unsigned int len)
10976 {
10977         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10978 }
10979
10980 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10981         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
10982         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
10983 };
10984
10985 /**
10986  *      nft_data_init - parse nf_tables data netlink attributes
10987  *
10988  *      @ctx: context of the expression using the data
10989  *      @data: destination struct nft_data
10990  *      @desc: data description
10991  *      @nla: netlink attribute containing data
10992  *
10993  *      Parse the netlink data attributes and initialize a struct nft_data.
10994  *      The type and length of data are returned in the data description.
10995  *
10996  *      The caller can indicate that it only wants to accept data of type
10997  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
10998  */
10999 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
11000                   struct nft_data_desc *desc, const struct nlattr *nla)
11001 {
11002         struct nlattr *tb[NFTA_DATA_MAX + 1];
11003         int err;
11004
11005         if (WARN_ON_ONCE(!desc->size))
11006                 return -EINVAL;
11007
11008         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
11009                                           nft_data_policy, NULL);
11010         if (err < 0)
11011                 return err;
11012
11013         if (tb[NFTA_DATA_VALUE]) {
11014                 if (desc->type != NFT_DATA_VALUE)
11015                         return -EINVAL;
11016
11017                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
11018         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
11019                 if (desc->type != NFT_DATA_VERDICT)
11020                         return -EINVAL;
11021
11022                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
11023         } else {
11024                 err = -EINVAL;
11025         }
11026
11027         return err;
11028 }
11029 EXPORT_SYMBOL_GPL(nft_data_init);
11030
11031 /**
11032  *      nft_data_release - release a nft_data item
11033  *
11034  *      @data: struct nft_data to release
11035  *      @type: type of data
11036  *
11037  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
11038  *      all others need to be released by calling this function.
11039  */
11040 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
11041 {
11042         if (type < NFT_DATA_VERDICT)
11043                 return;
11044         switch (type) {
11045         case NFT_DATA_VERDICT:
11046                 return nft_verdict_uninit(data);
11047         default:
11048                 WARN_ON(1);
11049         }
11050 }
11051 EXPORT_SYMBOL_GPL(nft_data_release);
11052
11053 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
11054                   enum nft_data_types type, unsigned int len)
11055 {
11056         struct nlattr *nest;
11057         int err;
11058
11059         nest = nla_nest_start_noflag(skb, attr);
11060         if (nest == NULL)
11061                 return -1;
11062
11063         switch (type) {
11064         case NFT_DATA_VALUE:
11065                 err = nft_value_dump(skb, data, len);
11066                 break;
11067         case NFT_DATA_VERDICT:
11068                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
11069                 break;
11070         default:
11071                 err = -EINVAL;
11072                 WARN_ON(1);
11073         }
11074
11075         nla_nest_end(skb, nest);
11076         return err;
11077 }
11078 EXPORT_SYMBOL_GPL(nft_data_dump);
11079
11080 int __nft_release_basechain(struct nft_ctx *ctx)
11081 {
11082         struct nft_rule *rule, *nr;
11083
11084         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
11085                 return 0;
11086
11087         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
11088         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
11089                 list_del(&rule->list);
11090                 nft_use_dec(&ctx->chain->use);
11091                 nf_tables_rule_release(ctx, rule);
11092         }
11093         nft_chain_del(ctx->chain);
11094         nft_use_dec(&ctx->table->use);
11095         nf_tables_chain_destroy(ctx);
11096
11097         return 0;
11098 }
11099 EXPORT_SYMBOL_GPL(__nft_release_basechain);
11100
11101 static void __nft_release_hook(struct net *net, struct nft_table *table)
11102 {
11103         struct nft_flowtable *flowtable;
11104         struct nft_chain *chain;
11105
11106         list_for_each_entry(chain, &table->chains, list)
11107                 __nf_tables_unregister_hook(net, table, chain, true);
11108         list_for_each_entry(flowtable, &table->flowtables, list)
11109                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
11110                                                      true);
11111 }
11112
11113 static void __nft_release_hooks(struct net *net)
11114 {
11115         struct nftables_pernet *nft_net = nft_pernet(net);
11116         struct nft_table *table;
11117
11118         list_for_each_entry(table, &nft_net->tables, list) {
11119                 if (nft_table_has_owner(table))
11120                         continue;
11121
11122                 __nft_release_hook(net, table);
11123         }
11124 }
11125
11126 static void __nft_release_table(struct net *net, struct nft_table *table)
11127 {
11128         struct nft_flowtable *flowtable, *nf;
11129         struct nft_chain *chain, *nc;
11130         struct nft_object *obj, *ne;
11131         struct nft_rule *rule, *nr;
11132         struct nft_set *set, *ns;
11133         struct nft_ctx ctx = {
11134                 .net    = net,
11135                 .family = NFPROTO_NETDEV,
11136         };
11137
11138         ctx.family = table->family;
11139         ctx.table = table;
11140         list_for_each_entry(chain, &table->chains, list) {
11141                 if (nft_chain_binding(chain))
11142                         continue;
11143
11144                 ctx.chain = chain;
11145                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
11146                         list_del(&rule->list);
11147                         nft_use_dec(&chain->use);
11148                         nf_tables_rule_release(&ctx, rule);
11149                 }
11150         }
11151         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
11152                 list_del(&flowtable->list);
11153                 nft_use_dec(&table->use);
11154                 nf_tables_flowtable_destroy(flowtable);
11155         }
11156         list_for_each_entry_safe(set, ns, &table->sets, list) {
11157                 list_del(&set->list);
11158                 nft_use_dec(&table->use);
11159                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
11160                         nft_map_deactivate(&ctx, set);
11161
11162                 nft_set_destroy(&ctx, set);
11163         }
11164         list_for_each_entry_safe(obj, ne, &table->objects, list) {
11165                 nft_obj_del(obj);
11166                 nft_use_dec(&table->use);
11167                 nft_obj_destroy(&ctx, obj);
11168         }
11169         list_for_each_entry_safe(chain, nc, &table->chains, list) {
11170                 ctx.chain = chain;
11171                 nft_chain_del(chain);
11172                 nft_use_dec(&table->use);
11173                 nf_tables_chain_destroy(&ctx);
11174         }
11175         nf_tables_table_destroy(&ctx);
11176 }
11177
11178 static void __nft_release_tables(struct net *net)
11179 {
11180         struct nftables_pernet *nft_net = nft_pernet(net);
11181         struct nft_table *table, *nt;
11182
11183         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
11184                 if (nft_table_has_owner(table))
11185                         continue;
11186
11187                 list_del(&table->list);
11188
11189                 __nft_release_table(net, table);
11190         }
11191 }
11192
11193 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
11194                             void *ptr)
11195 {
11196         struct nft_table *table, *to_delete[8];
11197         struct nftables_pernet *nft_net;
11198         struct netlink_notify *n = ptr;
11199         struct net *net = n->net;
11200         unsigned int deleted;
11201         bool restart = false;
11202         unsigned int gc_seq;
11203
11204         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
11205                 return NOTIFY_DONE;
11206
11207         nft_net = nft_pernet(net);
11208         deleted = 0;
11209         mutex_lock(&nft_net->commit_mutex);
11210
11211         gc_seq = nft_gc_seq_begin(nft_net);
11212
11213         if (!list_empty(&nf_tables_destroy_list))
11214                 nf_tables_trans_destroy_flush_work();
11215 again:
11216         list_for_each_entry(table, &nft_net->tables, list) {
11217                 if (nft_table_has_owner(table) &&
11218                     n->portid == table->nlpid) {
11219                         __nft_release_hook(net, table);
11220                         list_del_rcu(&table->list);
11221                         to_delete[deleted++] = table;
11222                         if (deleted >= ARRAY_SIZE(to_delete))
11223                                 break;
11224                 }
11225         }
11226         if (deleted) {
11227                 restart = deleted >= ARRAY_SIZE(to_delete);
11228                 synchronize_rcu();
11229                 while (deleted)
11230                         __nft_release_table(net, to_delete[--deleted]);
11231
11232                 if (restart)
11233                         goto again;
11234         }
11235         nft_gc_seq_end(nft_net, gc_seq);
11236
11237         mutex_unlock(&nft_net->commit_mutex);
11238
11239         return NOTIFY_DONE;
11240 }
11241
11242 static struct notifier_block nft_nl_notifier = {
11243         .notifier_call  = nft_rcv_nl_event,
11244 };
11245
11246 static int __net_init nf_tables_init_net(struct net *net)
11247 {
11248         struct nftables_pernet *nft_net = nft_pernet(net);
11249
11250         INIT_LIST_HEAD(&nft_net->tables);
11251         INIT_LIST_HEAD(&nft_net->commit_list);
11252         INIT_LIST_HEAD(&nft_net->binding_list);
11253         INIT_LIST_HEAD(&nft_net->module_list);
11254         INIT_LIST_HEAD(&nft_net->notify_list);
11255         mutex_init(&nft_net->commit_mutex);
11256         nft_net->base_seq = 1;
11257         nft_net->gc_seq = 0;
11258         nft_net->validate_state = NFT_VALIDATE_SKIP;
11259
11260         return 0;
11261 }
11262
11263 static void __net_exit nf_tables_pre_exit_net(struct net *net)
11264 {
11265         struct nftables_pernet *nft_net = nft_pernet(net);
11266
11267         mutex_lock(&nft_net->commit_mutex);
11268         __nft_release_hooks(net);
11269         mutex_unlock(&nft_net->commit_mutex);
11270 }
11271
11272 static void __net_exit nf_tables_exit_net(struct net *net)
11273 {
11274         struct nftables_pernet *nft_net = nft_pernet(net);
11275         unsigned int gc_seq;
11276
11277         mutex_lock(&nft_net->commit_mutex);
11278
11279         gc_seq = nft_gc_seq_begin(nft_net);
11280
11281         if (!list_empty(&nft_net->commit_list) ||
11282             !list_empty(&nft_net->module_list))
11283                 __nf_tables_abort(net, NFNL_ABORT_NONE);
11284
11285         __nft_release_tables(net);
11286
11287         nft_gc_seq_end(nft_net, gc_seq);
11288
11289         mutex_unlock(&nft_net->commit_mutex);
11290         WARN_ON_ONCE(!list_empty(&nft_net->tables));
11291         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
11292         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
11293 }
11294
11295 static void nf_tables_exit_batch(struct list_head *net_exit_list)
11296 {
11297         flush_work(&trans_gc_work);
11298 }
11299
11300 static struct pernet_operations nf_tables_net_ops = {
11301         .init           = nf_tables_init_net,
11302         .pre_exit       = nf_tables_pre_exit_net,
11303         .exit           = nf_tables_exit_net,
11304         .exit_batch     = nf_tables_exit_batch,
11305         .id             = &nf_tables_net_id,
11306         .size           = sizeof(struct nftables_pernet),
11307 };
11308
11309 static int __init nf_tables_module_init(void)
11310 {
11311         int err;
11312
11313         err = register_pernet_subsys(&nf_tables_net_ops);
11314         if (err < 0)
11315                 return err;
11316
11317         err = nft_chain_filter_init();
11318         if (err < 0)
11319                 goto err_chain_filter;
11320
11321         err = nf_tables_core_module_init();
11322         if (err < 0)
11323                 goto err_core_module;
11324
11325         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
11326         if (err < 0)
11327                 goto err_netdev_notifier;
11328
11329         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
11330         if (err < 0)
11331                 goto err_rht_objname;
11332
11333         err = nft_offload_init();
11334         if (err < 0)
11335                 goto err_offload;
11336
11337         err = netlink_register_notifier(&nft_nl_notifier);
11338         if (err < 0)
11339                 goto err_netlink_notifier;
11340
11341         /* must be last */
11342         err = nfnetlink_subsys_register(&nf_tables_subsys);
11343         if (err < 0)
11344                 goto err_nfnl_subsys;
11345
11346         nft_chain_route_init();
11347
11348         return err;
11349
11350 err_nfnl_subsys:
11351         netlink_unregister_notifier(&nft_nl_notifier);
11352 err_netlink_notifier:
11353         nft_offload_exit();
11354 err_offload:
11355         rhltable_destroy(&nft_objname_ht);
11356 err_rht_objname:
11357         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11358 err_netdev_notifier:
11359         nf_tables_core_module_exit();
11360 err_core_module:
11361         nft_chain_filter_fini();
11362 err_chain_filter:
11363         unregister_pernet_subsys(&nf_tables_net_ops);
11364         return err;
11365 }
11366
11367 static void __exit nf_tables_module_exit(void)
11368 {
11369         nfnetlink_subsys_unregister(&nf_tables_subsys);
11370         netlink_unregister_notifier(&nft_nl_notifier);
11371         nft_offload_exit();
11372         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11373         nft_chain_filter_fini();
11374         nft_chain_route_fini();
11375         unregister_pernet_subsys(&nf_tables_net_ops);
11376         cancel_work_sync(&trans_gc_work);
11377         cancel_work_sync(&trans_destroy_work);
11378         rcu_barrier();
11379         rhltable_destroy(&nft_objname_ht);
11380         nf_tables_core_module_exit();
11381 }
11382
11383 module_init(nf_tables_module_init);
11384 module_exit(nf_tables_module_exit);
11385
11386 MODULE_LICENSE("GPL");
11387 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11388 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);