net/netfilter/nf_tables_api.c

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