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 static LIST_HEAD(nf_tables_expressions);
  29 static LIST_HEAD(nf_tables_objects);
  30 static LIST_HEAD(nf_tables_flowtables);
  31 static LIST_HEAD(nf_tables_destroy_list);
  32 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  33 static u64 table_handle;
  34
  35 enum {
  36         NFT_VALIDATE_SKIP       = 0,
  37         NFT_VALIDATE_NEED,
  38         NFT_VALIDATE_DO,
  39 };
  40
  41 static struct rhltable nft_objname_ht;
  42
  43 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  44 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  45 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  46
  47 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  48 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  49 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  50
  51 static const struct rhashtable_params nft_chain_ht_params = {
  52         .head_offset            = offsetof(struct nft_chain, rhlhead),
  53         .key_offset             = offsetof(struct nft_chain, name),
  54         .hashfn                 = nft_chain_hash,
  55         .obj_hashfn             = nft_chain_hash_obj,
  56         .obj_cmpfn              = nft_chain_hash_cmp,
  57         .automatic_shrinking    = true,
  58 };
  59
  60 static const struct rhashtable_params nft_objname_ht_params = {
  61         .head_offset            = offsetof(struct nft_object, rhlhead),
  62         .key_offset             = offsetof(struct nft_object, key),
  63         .hashfn                 = nft_objname_hash,
  64         .obj_hashfn             = nft_objname_hash_obj,
  65         .obj_cmpfn              = nft_objname_hash_cmp,
  66         .automatic_shrinking    = true,
  67 };
  68
  69 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
  70 {
  71         switch (net->nft.validate_state) {
  72         case NFT_VALIDATE_SKIP:
  73                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
  74                 break;
  75         case NFT_VALIDATE_NEED:
  76                 break;
  77         case NFT_VALIDATE_DO:
  78                 if (new_validate_state == NFT_VALIDATE_NEED)
  79                         return;
  80         }
  81
  82         net->nft.validate_state = new_validate_state;
  83 }
  84 static void nf_tables_trans_destroy_work(struct work_struct *w);
  85 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
  86
  87 static void nft_ctx_init(struct nft_ctx *ctx,
  88                          struct net *net,
  89                          const struct sk_buff *skb,
  90                          const struct nlmsghdr *nlh,
  91                          u8 family,
  92                          struct nft_table *table,
  93                          struct nft_chain *chain,
  94                          const struct nlattr * const *nla)
  95 {
  96         ctx->net        = net;
  97         ctx->family     = family;
  98         ctx->level      = 0;
  99         ctx->table      = table;
 100         ctx->chain      = chain;
 101         ctx->nla        = nla;
 102         ctx->portid     = NETLINK_CB(skb).portid;
 103         ctx->report     = nlmsg_report(nlh);
 104         ctx->flags      = nlh->nlmsg_flags;
 105         ctx->seq        = nlh->nlmsg_seq;
 106 }
 107
 108 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 109                                              int msg_type, u32 size, gfp_t gfp)
 110 {
 111         struct nft_trans *trans;
 112
 113         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 114         if (trans == NULL)
 115                 return NULL;
 116
 117         trans->msg_type = msg_type;
 118         trans->ctx      = *ctx;
 119
 120         return trans;
 121 }
 122
 123 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 124                                          int msg_type, u32 size)
 125 {
 126         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 127 }
 128
 129 static void nft_trans_destroy(struct nft_trans *trans)
 130 {
 131         list_del(&trans->list);
 132         kfree(trans);
 133 }
 134
 135 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 136 {
 137         struct net *net = ctx->net;
 138         struct nft_trans *trans;
 139
 140         if (!nft_set_is_anonymous(set))
 141                 return;
 142
 143         list_for_each_entry_reverse(trans, &net->nft.commit_list, list) {
 144                 switch (trans->msg_type) {
 145                 case NFT_MSG_NEWSET:
 146                         if (nft_trans_set(trans) == set)
 147                                 nft_trans_set_bound(trans) = true;
 148                         break;
 149                 case NFT_MSG_NEWSETELEM:
 150                         if (nft_trans_elem_set(trans) == set)
 151                                 nft_trans_elem_set_bound(trans) = true;
 152                         break;
 153                 }
 154         }
 155 }
 156
 157 static int nft_netdev_register_hooks(struct net *net,
 158                                      struct list_head *hook_list)
 159 {
 160         struct nft_hook *hook;
 161         int err, j;
 162
 163         j = 0;
 164         list_for_each_entry(hook, hook_list, list) {
 165                 err = nf_register_net_hook(net, &hook->ops);
 166                 if (err < 0)
 167                         goto err_register;
 168
 169                 j++;
 170         }
 171         return 0;
 172
 173 err_register:
 174         list_for_each_entry(hook, hook_list, list) {
 175                 if (j-- <= 0)
 176                         break;
 177
 178                 nf_unregister_net_hook(net, &hook->ops);
 179         }
 180         return err;
 181 }
 182
 183 static void nft_netdev_unregister_hooks(struct net *net,
 184                                         struct list_head *hook_list)
 185 {
 186         struct nft_hook *hook;
 187
 188         list_for_each_entry(hook, hook_list, list)
 189                 nf_unregister_net_hook(net, &hook->ops);
 190 }
 191
 192 static int nf_tables_register_hook(struct net *net,
 193                                    const struct nft_table *table,
 194                                    struct nft_chain *chain)
 195 {
 196         struct nft_base_chain *basechain;
 197         const struct nf_hook_ops *ops;
 198
 199         if (table->flags & NFT_TABLE_F_DORMANT ||
 200             !nft_is_base_chain(chain))
 201                 return 0;
 202
 203         basechain = nft_base_chain(chain);
 204         ops = &basechain->ops;
 205
 206         if (basechain->type->ops_register)
 207                 return basechain->type->ops_register(net, ops);
 208
 209         if (table->family == NFPROTO_NETDEV)
 210                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 211
 212         return nf_register_net_hook(net, &basechain->ops);
 213 }
 214
 215 static void nf_tables_unregister_hook(struct net *net,
 216                                       const struct nft_table *table,
 217                                       struct nft_chain *chain)
 218 {
 219         struct nft_base_chain *basechain;
 220         const struct nf_hook_ops *ops;
 221
 222         if (table->flags & NFT_TABLE_F_DORMANT ||
 223             !nft_is_base_chain(chain))
 224                 return;
 225         basechain = nft_base_chain(chain);
 226         ops = &basechain->ops;
 227
 228         if (basechain->type->ops_unregister)
 229                 return basechain->type->ops_unregister(net, ops);
 230
 231         if (table->family == NFPROTO_NETDEV)
 232                 nft_netdev_unregister_hooks(net, &basechain->hook_list);
 233         else
 234                 nf_unregister_net_hook(net, &basechain->ops);
 235 }
 236
 237 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 238 {
 239         struct nft_trans *trans;
 240
 241         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 242         if (trans == NULL)
 243                 return -ENOMEM;
 244
 245         if (msg_type == NFT_MSG_NEWTABLE)
 246                 nft_activate_next(ctx->net, ctx->table);
 247
 248         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 249         return 0;
 250 }
 251
 252 static int nft_deltable(struct nft_ctx *ctx)
 253 {
 254         int err;
 255
 256         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 257         if (err < 0)
 258                 return err;
 259
 260         nft_deactivate_next(ctx->net, ctx->table);
 261         return err;
 262 }
 263
 264 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 265 {
 266         struct nft_trans *trans;
 267
 268         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 269         if (trans == NULL)
 270                 return ERR_PTR(-ENOMEM);
 271
 272         if (msg_type == NFT_MSG_NEWCHAIN) {
 273                 nft_activate_next(ctx->net, ctx->chain);
 274
 275                 if (ctx->nla[NFTA_CHAIN_ID]) {
 276                         nft_trans_chain_id(trans) =
 277                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 278                 }
 279         }
 280
 281         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 282         return trans;
 283 }
 284
 285 static int nft_delchain(struct nft_ctx *ctx)
 286 {
 287         struct nft_trans *trans;
 288
 289         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 290         if (IS_ERR(trans))
 291                 return PTR_ERR(trans);
 292
 293         ctx->table->use--;
 294         nft_deactivate_next(ctx->net, ctx->chain);
 295
 296         return 0;
 297 }
 298
 299 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
 300                                    struct nft_rule *rule)
 301 {
 302         struct nft_expr *expr;
 303
 304         expr = nft_expr_first(rule);
 305         while (expr != nft_expr_last(rule) && expr->ops) {
 306                 if (expr->ops->activate)
 307                         expr->ops->activate(ctx, expr);
 308
 309                 expr = nft_expr_next(expr);
 310         }
 311 }
 312
 313 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
 314                                      struct nft_rule *rule,
 315                                      enum nft_trans_phase phase)
 316 {
 317         struct nft_expr *expr;
 318
 319         expr = nft_expr_first(rule);
 320         while (expr != nft_expr_last(rule) && expr->ops) {
 321                 if (expr->ops->deactivate)
 322                         expr->ops->deactivate(ctx, expr, phase);
 323
 324                 expr = nft_expr_next(expr);
 325         }
 326 }
 327
 328 static int
 329 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 330 {
 331         /* You cannot delete the same rule twice */
 332         if (nft_is_active_next(ctx->net, rule)) {
 333                 nft_deactivate_next(ctx->net, rule);
 334                 ctx->chain->use--;
 335                 return 0;
 336         }
 337         return -ENOENT;
 338 }
 339
 340 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 341                                             struct nft_rule *rule)
 342 {
 343         struct nft_trans *trans;
 344
 345         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 346         if (trans == NULL)
 347                 return NULL;
 348
 349         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 350                 nft_trans_rule_id(trans) =
 351                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 352         }
 353         nft_trans_rule(trans) = rule;
 354         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 355
 356         return trans;
 357 }
 358
 359 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 360 {
 361         struct nft_flow_rule *flow;
 362         struct nft_trans *trans;
 363         int err;
 364
 365         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 366         if (trans == NULL)
 367                 return -ENOMEM;
 368
 369         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 370                 flow = nft_flow_rule_create(ctx->net, rule);
 371                 if (IS_ERR(flow)) {
 372                         nft_trans_destroy(trans);
 373                         return PTR_ERR(flow);
 374                 }
 375
 376                 nft_trans_flow_rule(trans) = flow;
 377         }
 378
 379         err = nf_tables_delrule_deactivate(ctx, rule);
 380         if (err < 0) {
 381                 nft_trans_destroy(trans);
 382                 return err;
 383         }
 384         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 385
 386         return 0;
 387 }
 388
 389 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 390 {
 391         struct nft_rule *rule;
 392         int err;
 393
 394         list_for_each_entry(rule, &ctx->chain->rules, list) {
 395                 if (!nft_is_active_next(ctx->net, rule))
 396                         continue;
 397
 398                 err = nft_delrule(ctx, rule);
 399                 if (err < 0)
 400                         return err;
 401         }
 402         return 0;
 403 }
 404
 405 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 406                              struct nft_set *set)
 407 {
 408         struct nft_trans *trans;
 409
 410         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 411         if (trans == NULL)
 412                 return -ENOMEM;
 413
 414         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
 415                 nft_trans_set_id(trans) =
 416                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 417                 nft_activate_next(ctx->net, set);
 418         }
 419         nft_trans_set(trans) = set;
 420         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 421
 422         return 0;
 423 }
 424
 425 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 426 {
 427         int err;
 428
 429         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 430         if (err < 0)
 431                 return err;
 432
 433         nft_deactivate_next(ctx->net, set);
 434         ctx->table->use--;
 435
 436         return err;
 437 }
 438
 439 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 440                              struct nft_object *obj)
 441 {
 442         struct nft_trans *trans;
 443
 444         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 445         if (trans == NULL)
 446                 return -ENOMEM;
 447
 448         if (msg_type == NFT_MSG_NEWOBJ)
 449                 nft_activate_next(ctx->net, obj);
 450
 451         nft_trans_obj(trans) = obj;
 452         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 453
 454         return 0;
 455 }
 456
 457 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 458 {
 459         int err;
 460
 461         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 462         if (err < 0)
 463                 return err;
 464
 465         nft_deactivate_next(ctx->net, obj);
 466         ctx->table->use--;
 467
 468         return err;
 469 }
 470
 471 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 472                                    struct nft_flowtable *flowtable)
 473 {
 474         struct nft_trans *trans;
 475
 476         trans = nft_trans_alloc(ctx, msg_type,
 477                                 sizeof(struct nft_trans_flowtable));
 478         if (trans == NULL)
 479                 return -ENOMEM;
 480
 481         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 482                 nft_activate_next(ctx->net, flowtable);
 483
 484         nft_trans_flowtable(trans) = flowtable;
 485         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 486
 487         return 0;
 488 }
 489
 490 static int nft_delflowtable(struct nft_ctx *ctx,
 491                             struct nft_flowtable *flowtable)
 492 {
 493         int err;
 494
 495         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 496         if (err < 0)
 497                 return err;
 498
 499         nft_deactivate_next(ctx->net, flowtable);
 500         ctx->table->use--;
 501
 502         return err;
 503 }
 504
 505 /*
 506  * Tables
 507  */
 508
 509 static struct nft_table *nft_table_lookup(const struct net *net,
 510                                           const struct nlattr *nla,
 511                                           u8 family, u8 genmask)
 512 {
 513         struct nft_table *table;
 514
 515         if (nla == NULL)
 516                 return ERR_PTR(-EINVAL);
 517
 518         list_for_each_entry_rcu(table, &net->nft.tables, list,
 519                                 lockdep_is_held(&net->nft.commit_mutex)) {
 520                 if (!nla_strcmp(nla, table->name) &&
 521                     table->family == family &&
 522                     nft_active_genmask(table, genmask))
 523                         return table;
 524         }
 525
 526         return ERR_PTR(-ENOENT);
 527 }
 528
 529 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 530                                                    const struct nlattr *nla,
 531                                                    u8 genmask)
 532 {
 533         struct nft_table *table;
 534
 535         list_for_each_entry(table, &net->nft.tables, list) {
 536                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 537                     nft_active_genmask(table, genmask))
 538                         return table;
 539         }
 540
 541         return ERR_PTR(-ENOENT);
 542 }
 543
 544 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 545 {
 546         return ++table->hgenerator;
 547 }
 548
 549 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 550
 551 static const struct nft_chain_type *
 552 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 553 {
 554         if (family >= NFPROTO_NUMPROTO ||
 555             type >= NFT_CHAIN_T_MAX)
 556                 return NULL;
 557
 558         return chain_type[family][type];
 559 }
 560
 561 static const struct nft_chain_type *
 562 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 563 {
 564         const struct nft_chain_type *type;
 565         int i;
 566
 567         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 568                 type = __nft_chain_type_get(family, i);
 569                 if (!type)
 570                         continue;
 571                 if (!nla_strcmp(nla, type->name))
 572                         return type;
 573         }
 574         return NULL;
 575 }
 576
 577 struct nft_module_request {
 578         struct list_head        list;
 579         char                    module[MODULE_NAME_LEN];
 580         bool                    done;
 581 };
 582
 583 #ifdef CONFIG_MODULES
 584 static int nft_request_module(struct net *net, const char *fmt, ...)
 585 {
 586         char module_name[MODULE_NAME_LEN];
 587         struct nft_module_request *req;
 588         va_list args;
 589         int ret;
 590
 591         va_start(args, fmt);
 592         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 593         va_end(args);
 594         if (ret >= MODULE_NAME_LEN)
 595                 return 0;
 596
 597         list_for_each_entry(req, &net->nft.module_list, list) {
 598                 if (!strcmp(req->module, module_name)) {
 599                         if (req->done)
 600                                 return 0;
 601
 602                         /* A request to load this module already exists. */
 603                         return -EAGAIN;
 604                 }
 605         }
 606
 607         req = kmalloc(sizeof(*req), GFP_KERNEL);
 608         if (!req)
 609                 return -ENOMEM;
 610
 611         req->done = false;
 612         strlcpy(req->module, module_name, MODULE_NAME_LEN);
 613         list_add_tail(&req->list, &net->nft.module_list);
 614
 615         return -EAGAIN;
 616 }
 617 #endif
 618
 619 static void lockdep_nfnl_nft_mutex_not_held(void)
 620 {
 621 #ifdef CONFIG_PROVE_LOCKING
 622         WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 623 #endif
 624 }
 625
 626 static const struct nft_chain_type *
 627 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 628                             u8 family, bool autoload)
 629 {
 630         const struct nft_chain_type *type;
 631
 632         type = __nf_tables_chain_type_lookup(nla, family);
 633         if (type != NULL)
 634                 return type;
 635
 636         lockdep_nfnl_nft_mutex_not_held();
 637 #ifdef CONFIG_MODULES
 638         if (autoload) {
 639                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 640                                        nla_len(nla),
 641                                        (const char *)nla_data(nla)) == -EAGAIN)
 642                         return ERR_PTR(-EAGAIN);
 643         }
 644 #endif
 645         return ERR_PTR(-ENOENT);
 646 }
 647
 648 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 649         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 650                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 651         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 652         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 653 };
 654
 655 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 656                                      u32 portid, u32 seq, int event, u32 flags,
 657                                      int family, const struct nft_table *table)
 658 {
 659         struct nlmsghdr *nlh;
 660         struct nfgenmsg *nfmsg;
 661
 662         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 663         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
 664         if (nlh == NULL)
 665                 goto nla_put_failure;
 666
 667         nfmsg = nlmsg_data(nlh);
 668         nfmsg->nfgen_family     = family;
 669         nfmsg->version          = NFNETLINK_V0;
 670         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
 671
 672         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 673             nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
 674             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 675             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 676                          NFTA_TABLE_PAD))
 677                 goto nla_put_failure;
 678
 679         nlmsg_end(skb, nlh);
 680         return 0;
 681
 682 nla_put_failure:
 683         nlmsg_trim(skb, nlh);
 684         return -1;
 685 }
 686
 687 struct nftnl_skb_parms {
 688         bool report;
 689 };
 690 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 691
 692 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 693                                struct list_head *notify_list)
 694 {
 695         NFT_CB(skb).report = report;
 696         list_add_tail(&skb->list, notify_list);
 697 }
 698
 699 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 700 {
 701         struct sk_buff *skb;
 702         int err;
 703         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;?:0",
 704                               ctx->table->name, ctx->table->handle);
 705
 706         audit_log_nfcfg(buf,
 707                         ctx->family,
 708                         ctx->table->use,
 709                         event == NFT_MSG_NEWTABLE ?
 710                                 AUDIT_NFT_OP_TABLE_REGISTER :
 711                                 AUDIT_NFT_OP_TABLE_UNREGISTER,
 712                         GFP_KERNEL);
 713         kfree(buf);
 714
 715         if (!ctx->report &&
 716             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 717                 return;
 718
 719         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 720         if (skb == NULL)
 721                 goto err;
 722
 723         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 724                                         event, 0, ctx->family, ctx->table);
 725         if (err < 0) {
 726                 kfree_skb(skb);
 727                 goto err;
 728         }
 729
 730         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
 731         return;
 732 err:
 733         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 734 }
 735
 736 static int nf_tables_dump_tables(struct sk_buff *skb,
 737                                  struct netlink_callback *cb)
 738 {
 739         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 740         const struct nft_table *table;
 741         unsigned int idx = 0, s_idx = cb->args[0];
 742         struct net *net = sock_net(skb->sk);
 743         int family = nfmsg->nfgen_family;
 744
 745         rcu_read_lock();
 746         cb->seq = net->nft.base_seq;
 747
 748         list_for_each_entry_rcu(table, &net->nft.tables, list) {
 749                 if (family != NFPROTO_UNSPEC && family != table->family)
 750                         continue;
 751
 752                 if (idx < s_idx)
 753                         goto cont;
 754                 if (idx > s_idx)
 755                         memset(&cb->args[1], 0,
 756                                sizeof(cb->args) - sizeof(cb->args[0]));
 757                 if (!nft_is_active(net, table))
 758                         continue;
 759                 if (nf_tables_fill_table_info(skb, net,
 760                                               NETLINK_CB(cb->skb).portid,
 761                                               cb->nlh->nlmsg_seq,
 762                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 763                                               table->family, table) < 0)
 764                         goto done;
 765
 766                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 767 cont:
 768                 idx++;
 769         }
 770 done:
 771         rcu_read_unlock();
 772         cb->args[0] = idx;
 773         return skb->len;
 774 }
 775
 776 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 777                                       const struct nlmsghdr *nlh,
 778                                       struct netlink_dump_control *c)
 779 {
 780         int err;
 781
 782         if (!try_module_get(THIS_MODULE))
 783                 return -EINVAL;
 784
 785         rcu_read_unlock();
 786         err = netlink_dump_start(nlsk, skb, nlh, c);
 787         rcu_read_lock();
 788         module_put(THIS_MODULE);
 789
 790         return err;
 791 }
 792
 793 /* called with rcu_read_lock held */
 794 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
 795                               struct sk_buff *skb, const struct nlmsghdr *nlh,
 796                               const struct nlattr * const nla[],
 797                               struct netlink_ext_ack *extack)
 798 {
 799         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 800         u8 genmask = nft_genmask_cur(net);
 801         const struct nft_table *table;
 802         struct sk_buff *skb2;
 803         int family = nfmsg->nfgen_family;
 804         int err;
 805
 806         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 807                 struct netlink_dump_control c = {
 808                         .dump = nf_tables_dump_tables,
 809                         .module = THIS_MODULE,
 810                 };
 811
 812                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
 813         }
 814
 815         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
 816         if (IS_ERR(table)) {
 817                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 818                 return PTR_ERR(table);
 819         }
 820
 821         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 822         if (!skb2)
 823                 return -ENOMEM;
 824
 825         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 826                                         nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
 827                                         family, table);
 828         if (err < 0)
 829                 goto err_fill_table_info;
 830
 831         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 832
 833 err_fill_table_info:
 834         kfree_skb(skb2);
 835         return err;
 836 }
 837
 838 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
 839 {
 840         struct nft_chain *chain;
 841         u32 i = 0;
 842
 843         list_for_each_entry(chain, &table->chains, list) {
 844                 if (!nft_is_active_next(net, chain))
 845                         continue;
 846                 if (!nft_is_base_chain(chain))
 847                         continue;
 848
 849                 if (cnt && i++ == cnt)
 850                         break;
 851
 852                 nf_tables_unregister_hook(net, table, chain);
 853         }
 854 }
 855
 856 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
 857 {
 858         struct nft_chain *chain;
 859         int err, i = 0;
 860
 861         list_for_each_entry(chain, &table->chains, list) {
 862                 if (!nft_is_active_next(net, chain))
 863                         continue;
 864                 if (!nft_is_base_chain(chain))
 865                         continue;
 866
 867                 err = nf_tables_register_hook(net, table, chain);
 868                 if (err < 0)
 869                         goto err_register_hooks;
 870
 871                 i++;
 872         }
 873         return 0;
 874
 875 err_register_hooks:
 876         if (i)
 877                 nft_table_disable(net, table, i);
 878         return err;
 879 }
 880
 881 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
 882 {
 883         nft_table_disable(net, table, 0);
 884 }
 885
 886 static int nf_tables_updtable(struct nft_ctx *ctx)
 887 {
 888         struct nft_trans *trans;
 889         u32 flags;
 890         int ret = 0;
 891
 892         if (!ctx->nla[NFTA_TABLE_FLAGS])
 893                 return 0;
 894
 895         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
 896         if (flags & ~NFT_TABLE_F_DORMANT)
 897                 return -EINVAL;
 898
 899         if (flags == ctx->table->flags)
 900                 return 0;
 901
 902         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
 903                                 sizeof(struct nft_trans_table));
 904         if (trans == NULL)
 905                 return -ENOMEM;
 906
 907         if ((flags & NFT_TABLE_F_DORMANT) &&
 908             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
 909                 nft_trans_table_enable(trans) = false;
 910         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
 911                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
 912                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
 913                 ret = nf_tables_table_enable(ctx->net, ctx->table);
 914                 if (ret >= 0)
 915                         nft_trans_table_enable(trans) = true;
 916                 else
 917                         ctx->table->flags |= NFT_TABLE_F_DORMANT;
 918         }
 919         if (ret < 0)
 920                 goto err;
 921
 922         nft_trans_table_update(trans) = true;
 923         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 924         return 0;
 925 err:
 926         nft_trans_destroy(trans);
 927         return ret;
 928 }
 929
 930 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
 931 {
 932         const char *name = data;
 933
 934         return jhash(name, strlen(name), seed);
 935 }
 936
 937 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
 938 {
 939         const struct nft_chain *chain = data;
 940
 941         return nft_chain_hash(chain->name, 0, seed);
 942 }
 943
 944 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
 945                               const void *ptr)
 946 {
 947         const struct nft_chain *chain = ptr;
 948         const char *name = arg->key;
 949
 950         return strcmp(chain->name, name);
 951 }
 952
 953 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
 954 {
 955         const struct nft_object_hash_key *k = data;
 956
 957         seed ^= hash_ptr(k->table, 32);
 958
 959         return jhash(k->name, strlen(k->name), seed);
 960 }
 961
 962 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
 963 {
 964         const struct nft_object *obj = data;
 965
 966         return nft_objname_hash(&obj->key, 0, seed);
 967 }
 968
 969 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
 970                                 const void *ptr)
 971 {
 972         const struct nft_object_hash_key *k = arg->key;
 973         const struct nft_object *obj = ptr;
 974
 975         if (obj->key.table != k->table)
 976                 return -1;
 977
 978         return strcmp(obj->key.name, k->name);
 979 }
 980
 981 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
 982                               struct sk_buff *skb, const struct nlmsghdr *nlh,
 983                               const struct nlattr * const nla[],
 984                               struct netlink_ext_ack *extack)
 985 {
 986         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 987         u8 genmask = nft_genmask_next(net);
 988         int family = nfmsg->nfgen_family;
 989         const struct nlattr *attr;
 990         struct nft_table *table;
 991         u32 flags = 0;
 992         struct nft_ctx ctx;
 993         int err;
 994
 995         lockdep_assert_held(&net->nft.commit_mutex);
 996         attr = nla[NFTA_TABLE_NAME];
 997         table = nft_table_lookup(net, attr, family, genmask);
 998         if (IS_ERR(table)) {
 999                 if (PTR_ERR(table) != -ENOENT)
1000                         return PTR_ERR(table);
1001         } else {
1002                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1003                         NL_SET_BAD_ATTR(extack, attr);
1004                         return -EEXIST;
1005                 }
1006                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1007                         return -EOPNOTSUPP;
1008
1009                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1010                 return nf_tables_updtable(&ctx);
1011         }
1012
1013         if (nla[NFTA_TABLE_FLAGS]) {
1014                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1015                 if (flags & ~NFT_TABLE_F_DORMANT)
1016                         return -EINVAL;
1017         }
1018
1019         err = -ENOMEM;
1020         table = kzalloc(sizeof(*table), GFP_KERNEL);
1021         if (table == NULL)
1022                 goto err_kzalloc;
1023
1024         table->name = nla_strdup(attr, GFP_KERNEL);
1025         if (table->name == NULL)
1026                 goto err_strdup;
1027
1028         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1029         if (err)
1030                 goto err_chain_ht;
1031
1032         INIT_LIST_HEAD(&table->chains);
1033         INIT_LIST_HEAD(&table->sets);
1034         INIT_LIST_HEAD(&table->objects);
1035         INIT_LIST_HEAD(&table->flowtables);
1036         table->family = family;
1037         table->flags = flags;
1038         table->handle = ++table_handle;
1039
1040         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1041         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1042         if (err < 0)
1043                 goto err_trans;
1044
1045         list_add_tail_rcu(&table->list, &net->nft.tables);
1046         return 0;
1047 err_trans:
1048         rhltable_destroy(&table->chains_ht);
1049 err_chain_ht:
1050         kfree(table->name);
1051 err_strdup:
1052         kfree(table);
1053 err_kzalloc:
1054         return err;
1055 }
1056
1057 static int nft_flush_table(struct nft_ctx *ctx)
1058 {
1059         struct nft_flowtable *flowtable, *nft;
1060         struct nft_chain *chain, *nc;
1061         struct nft_object *obj, *ne;
1062         struct nft_set *set, *ns;
1063         int err;
1064
1065         list_for_each_entry(chain, &ctx->table->chains, list) {
1066                 if (!nft_is_active_next(ctx->net, chain))
1067                         continue;
1068
1069                 if (nft_chain_is_bound(chain))
1070                         continue;
1071
1072                 ctx->chain = chain;
1073
1074                 err = nft_delrule_by_chain(ctx);
1075                 if (err < 0)
1076                         goto out;
1077         }
1078
1079         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1080                 if (!nft_is_active_next(ctx->net, set))
1081                         continue;
1082
1083                 if (nft_set_is_anonymous(set) &&
1084                     !list_empty(&set->bindings))
1085                         continue;
1086
1087                 err = nft_delset(ctx, set);
1088                 if (err < 0)
1089                         goto out;
1090         }
1091
1092         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1093                 if (!nft_is_active_next(ctx->net, flowtable))
1094                         continue;
1095
1096                 err = nft_delflowtable(ctx, flowtable);
1097                 if (err < 0)
1098                         goto out;
1099         }
1100
1101         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1102                 if (!nft_is_active_next(ctx->net, obj))
1103                         continue;
1104
1105                 err = nft_delobj(ctx, obj);
1106                 if (err < 0)
1107                         goto out;
1108         }
1109
1110         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1111                 if (!nft_is_active_next(ctx->net, chain))
1112                         continue;
1113
1114                 if (nft_chain_is_bound(chain))
1115                         continue;
1116
1117                 ctx->chain = chain;
1118
1119                 err = nft_delchain(ctx);
1120                 if (err < 0)
1121                         goto out;
1122         }
1123
1124         err = nft_deltable(ctx);
1125 out:
1126         return err;
1127 }
1128
1129 static int nft_flush(struct nft_ctx *ctx, int family)
1130 {
1131         struct nft_table *table, *nt;
1132         const struct nlattr * const *nla = ctx->nla;
1133         int err = 0;
1134
1135         list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
1136                 if (family != AF_UNSPEC && table->family != family)
1137                         continue;
1138
1139                 ctx->family = table->family;
1140
1141                 if (!nft_is_active_next(ctx->net, table))
1142                         continue;
1143
1144                 if (nla[NFTA_TABLE_NAME] &&
1145                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1146                         continue;
1147
1148                 ctx->table = table;
1149
1150                 err = nft_flush_table(ctx);
1151                 if (err < 0)
1152                         goto out;
1153         }
1154 out:
1155         return err;
1156 }
1157
1158 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1159                               struct sk_buff *skb, const struct nlmsghdr *nlh,
1160                               const struct nlattr * const nla[],
1161                               struct netlink_ext_ack *extack)
1162 {
1163         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1164         u8 genmask = nft_genmask_next(net);
1165         int family = nfmsg->nfgen_family;
1166         const struct nlattr *attr;
1167         struct nft_table *table;
1168         struct nft_ctx ctx;
1169
1170         nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
1171         if (family == AF_UNSPEC ||
1172             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1173                 return nft_flush(&ctx, family);
1174
1175         if (nla[NFTA_TABLE_HANDLE]) {
1176                 attr = nla[NFTA_TABLE_HANDLE];
1177                 table = nft_table_lookup_byhandle(net, attr, genmask);
1178         } else {
1179                 attr = nla[NFTA_TABLE_NAME];
1180                 table = nft_table_lookup(net, attr, family, genmask);
1181         }
1182
1183         if (IS_ERR(table)) {
1184                 NL_SET_BAD_ATTR(extack, attr);
1185                 return PTR_ERR(table);
1186         }
1187
1188         if (nlh->nlmsg_flags & NLM_F_NONREC &&
1189             table->use > 0)
1190                 return -EBUSY;
1191
1192         ctx.family = family;
1193         ctx.table = table;
1194
1195         return nft_flush_table(&ctx);
1196 }
1197
1198 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1199 {
1200         if (WARN_ON(ctx->table->use > 0))
1201                 return;
1202
1203         rhltable_destroy(&ctx->table->chains_ht);
1204         kfree(ctx->table->name);
1205         kfree(ctx->table);
1206 }
1207
1208 void nft_register_chain_type(const struct nft_chain_type *ctype)
1209 {
1210         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1211         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1212                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1213                 return;
1214         }
1215         chain_type[ctype->family][ctype->type] = ctype;
1216         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1217 }
1218 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1219
1220 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1221 {
1222         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1223         chain_type[ctype->family][ctype->type] = NULL;
1224         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1225 }
1226 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1227
1228 /*
1229  * Chains
1230  */
1231
1232 static struct nft_chain *
1233 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1234 {
1235         struct nft_chain *chain;
1236
1237         list_for_each_entry(chain, &table->chains, list) {
1238                 if (chain->handle == handle &&
1239                     nft_active_genmask(chain, genmask))
1240                         return chain;
1241         }
1242
1243         return ERR_PTR(-ENOENT);
1244 }
1245
1246 static bool lockdep_commit_lock_is_held(const struct net *net)
1247 {
1248 #ifdef CONFIG_PROVE_LOCKING
1249         return lockdep_is_held(&net->nft.commit_mutex);
1250 #else
1251         return true;
1252 #endif
1253 }
1254
1255 static struct nft_chain *nft_chain_lookup(struct net *net,
1256                                           struct nft_table *table,
1257                                           const struct nlattr *nla, u8 genmask)
1258 {
1259         char search[NFT_CHAIN_MAXNAMELEN + 1];
1260         struct rhlist_head *tmp, *list;
1261         struct nft_chain *chain;
1262
1263         if (nla == NULL)
1264                 return ERR_PTR(-EINVAL);
1265
1266         nla_strlcpy(search, nla, sizeof(search));
1267
1268         WARN_ON(!rcu_read_lock_held() &&
1269                 !lockdep_commit_lock_is_held(net));
1270
1271         chain = ERR_PTR(-ENOENT);
1272         rcu_read_lock();
1273         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1274         if (!list)
1275                 goto out_unlock;
1276
1277         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1278                 if (nft_active_genmask(chain, genmask))
1279                         goto out_unlock;
1280         }
1281         chain = ERR_PTR(-ENOENT);
1282 out_unlock:
1283         rcu_read_unlock();
1284         return chain;
1285 }
1286
1287 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1288         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1289                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1290         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1291         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1292                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1293         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1294         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1295         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1296                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1297         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1298         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1299         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1300 };
1301
1302 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1303         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1304         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1305         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1306                                     .len = IFNAMSIZ - 1 },
1307 };
1308
1309 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1310 {
1311         struct nft_stats *cpu_stats, total;
1312         struct nlattr *nest;
1313         unsigned int seq;
1314         u64 pkts, bytes;
1315         int cpu;
1316
1317         if (!stats)
1318                 return 0;
1319
1320         memset(&total, 0, sizeof(total));
1321         for_each_possible_cpu(cpu) {
1322                 cpu_stats = per_cpu_ptr(stats, cpu);
1323                 do {
1324                         seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1325                         pkts = cpu_stats->pkts;
1326                         bytes = cpu_stats->bytes;
1327                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1328                 total.pkts += pkts;
1329                 total.bytes += bytes;
1330         }
1331         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1332         if (nest == NULL)
1333                 goto nla_put_failure;
1334
1335         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1336                          NFTA_COUNTER_PAD) ||
1337             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1338                          NFTA_COUNTER_PAD))
1339                 goto nla_put_failure;
1340
1341         nla_nest_end(skb, nest);
1342         return 0;
1343
1344 nla_put_failure:
1345         return -ENOSPC;
1346 }
1347
1348 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1349                                    const struct nft_base_chain *basechain)
1350 {
1351         const struct nf_hook_ops *ops = &basechain->ops;
1352         struct nft_hook *hook, *first = NULL;
1353         struct nlattr *nest, *nest_devs;
1354         int n = 0;
1355
1356         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1357         if (nest == NULL)
1358                 goto nla_put_failure;
1359         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1360                 goto nla_put_failure;
1361         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1362                 goto nla_put_failure;
1363
1364         if (family == NFPROTO_NETDEV) {
1365                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1366                 list_for_each_entry(hook, &basechain->hook_list, list) {
1367                         if (!first)
1368                                 first = hook;
1369
1370                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1371                                            hook->ops.dev->name))
1372                                 goto nla_put_failure;
1373                         n++;
1374                 }
1375                 nla_nest_end(skb, nest_devs);
1376
1377                 if (n == 1 &&
1378                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1379                         goto nla_put_failure;
1380         }
1381         nla_nest_end(skb, nest);
1382
1383         return 0;
1384 nla_put_failure:
1385         return -1;
1386 }
1387
1388 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1389                                      u32 portid, u32 seq, int event, u32 flags,
1390                                      int family, const struct nft_table *table,
1391                                      const struct nft_chain *chain)
1392 {
1393         struct nlmsghdr *nlh;
1394         struct nfgenmsg *nfmsg;
1395
1396         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1397         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1398         if (nlh == NULL)
1399                 goto nla_put_failure;
1400
1401         nfmsg = nlmsg_data(nlh);
1402         nfmsg->nfgen_family     = family;
1403         nfmsg->version          = NFNETLINK_V0;
1404         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
1405
1406         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1407                 goto nla_put_failure;
1408         if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1409                          NFTA_CHAIN_PAD))
1410                 goto nla_put_failure;
1411         if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1412                 goto nla_put_failure;
1413
1414         if (nft_is_base_chain(chain)) {
1415                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1416                 struct nft_stats __percpu *stats;
1417
1418                 if (nft_dump_basechain_hook(skb, family, basechain))
1419                         goto nla_put_failure;
1420
1421                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1422                                  htonl(basechain->policy)))
1423                         goto nla_put_failure;
1424
1425                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1426                         goto nla_put_failure;
1427
1428                 stats = rcu_dereference_check(basechain->stats,
1429                                               lockdep_commit_lock_is_held(net));
1430                 if (nft_dump_stats(skb, stats))
1431                         goto nla_put_failure;
1432         }
1433
1434         if (chain->flags &&
1435             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1436                 goto nla_put_failure;
1437
1438         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1439                 goto nla_put_failure;
1440
1441         nlmsg_end(skb, nlh);
1442         return 0;
1443
1444 nla_put_failure:
1445         nlmsg_trim(skb, nlh);
1446         return -1;
1447 }
1448
1449 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1450 {
1451         struct sk_buff *skb;
1452         int err;
1453         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
1454                               ctx->table->name, ctx->table->handle,
1455                               ctx->chain->name, ctx->chain->handle);
1456
1457         audit_log_nfcfg(buf,
1458                         ctx->family,
1459                         ctx->chain->use,
1460                         event == NFT_MSG_NEWCHAIN ?
1461                                 AUDIT_NFT_OP_CHAIN_REGISTER :
1462                                 AUDIT_NFT_OP_CHAIN_UNREGISTER,
1463                         GFP_KERNEL);
1464         kfree(buf);
1465
1466         if (!ctx->report &&
1467             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1468                 return;
1469
1470         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1471         if (skb == NULL)
1472                 goto err;
1473
1474         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1475                                         event, 0, ctx->family, ctx->table,
1476                                         ctx->chain);
1477         if (err < 0) {
1478                 kfree_skb(skb);
1479                 goto err;
1480         }
1481
1482         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
1483         return;
1484 err:
1485         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1486 }
1487
1488 static int nf_tables_dump_chains(struct sk_buff *skb,
1489                                  struct netlink_callback *cb)
1490 {
1491         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1492         const struct nft_table *table;
1493         const struct nft_chain *chain;
1494         unsigned int idx = 0, s_idx = cb->args[0];
1495         struct net *net = sock_net(skb->sk);
1496         int family = nfmsg->nfgen_family;
1497
1498         rcu_read_lock();
1499         cb->seq = net->nft.base_seq;
1500
1501         list_for_each_entry_rcu(table, &net->nft.tables, list) {
1502                 if (family != NFPROTO_UNSPEC && family != table->family)
1503                         continue;
1504
1505                 list_for_each_entry_rcu(chain, &table->chains, list) {
1506                         if (idx < s_idx)
1507                                 goto cont;
1508                         if (idx > s_idx)
1509                                 memset(&cb->args[1], 0,
1510                                        sizeof(cb->args) - sizeof(cb->args[0]));
1511                         if (!nft_is_active(net, chain))
1512                                 continue;
1513                         if (nf_tables_fill_chain_info(skb, net,
1514                                                       NETLINK_CB(cb->skb).portid,
1515                                                       cb->nlh->nlmsg_seq,
1516                                                       NFT_MSG_NEWCHAIN,
1517                                                       NLM_F_MULTI,
1518                                                       table->family, table,
1519                                                       chain) < 0)
1520                                 goto done;
1521
1522                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1523 cont:
1524                         idx++;
1525                 }
1526         }
1527 done:
1528         rcu_read_unlock();
1529         cb->args[0] = idx;
1530         return skb->len;
1531 }
1532
1533 /* called with rcu_read_lock held */
1534 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1535                               struct sk_buff *skb, const struct nlmsghdr *nlh,
1536                               const struct nlattr * const nla[],
1537                               struct netlink_ext_ack *extack)
1538 {
1539         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1540         u8 genmask = nft_genmask_cur(net);
1541         const struct nft_chain *chain;
1542         struct nft_table *table;
1543         struct sk_buff *skb2;
1544         int family = nfmsg->nfgen_family;
1545         int err;
1546
1547         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1548                 struct netlink_dump_control c = {
1549                         .dump = nf_tables_dump_chains,
1550                         .module = THIS_MODULE,
1551                 };
1552
1553                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1554         }
1555
1556         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1557         if (IS_ERR(table)) {
1558                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1559                 return PTR_ERR(table);
1560         }
1561
1562         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1563         if (IS_ERR(chain)) {
1564                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1565                 return PTR_ERR(chain);
1566         }
1567
1568         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1569         if (!skb2)
1570                 return -ENOMEM;
1571
1572         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1573                                         nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1574                                         family, table, chain);
1575         if (err < 0)
1576                 goto err_fill_chain_info;
1577
1578         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1579
1580 err_fill_chain_info:
1581         kfree_skb(skb2);
1582         return err;
1583 }
1584
1585 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1586         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1587         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1588 };
1589
1590 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1591 {
1592         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1593         struct nft_stats __percpu *newstats;
1594         struct nft_stats *stats;
1595         int err;
1596
1597         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1598                                           nft_counter_policy, NULL);
1599         if (err < 0)
1600                 return ERR_PTR(err);
1601
1602         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1603                 return ERR_PTR(-EINVAL);
1604
1605         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1606         if (newstats == NULL)
1607                 return ERR_PTR(-ENOMEM);
1608
1609         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1610          * are not exposed to userspace.
1611          */
1612         preempt_disable();
1613         stats = this_cpu_ptr(newstats);
1614         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1615         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1616         preempt_enable();
1617
1618         return newstats;
1619 }
1620
1621 static void nft_chain_stats_replace(struct nft_trans *trans)
1622 {
1623         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1624
1625         if (!nft_trans_chain_stats(trans))
1626                 return;
1627
1628         nft_trans_chain_stats(trans) =
1629                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1630                                     lockdep_commit_lock_is_held(trans->ctx.net));
1631
1632         if (!nft_trans_chain_stats(trans))
1633                 static_branch_inc(&nft_counters_enabled);
1634 }
1635
1636 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1637 {
1638         struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1639         struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1640
1641         if (g0 != g1)
1642                 kvfree(g1);
1643         kvfree(g0);
1644
1645         /* should be NULL either via abort or via successful commit */
1646         WARN_ON_ONCE(chain->rules_next);
1647         kvfree(chain->rules_next);
1648 }
1649
1650 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1651 {
1652         struct nft_chain *chain = ctx->chain;
1653         struct nft_hook *hook, *next;
1654
1655         if (WARN_ON(chain->use > 0))
1656                 return;
1657
1658         /* no concurrent access possible anymore */
1659         nf_tables_chain_free_chain_rules(chain);
1660
1661         if (nft_is_base_chain(chain)) {
1662                 struct nft_base_chain *basechain = nft_base_chain(chain);
1663
1664                 if (ctx->family == NFPROTO_NETDEV) {
1665                         list_for_each_entry_safe(hook, next,
1666                                                  &basechain->hook_list, list) {
1667                                 list_del_rcu(&hook->list);
1668                                 kfree_rcu(hook, rcu);
1669                         }
1670                 }
1671                 module_put(basechain->type->owner);
1672                 if (rcu_access_pointer(basechain->stats)) {
1673                         static_branch_dec(&nft_counters_enabled);
1674                         free_percpu(rcu_dereference_raw(basechain->stats));
1675                 }
1676                 kfree(chain->name);
1677                 kfree(basechain);
1678         } else {
1679                 kfree(chain->name);
1680                 kfree(chain);
1681         }
1682 }
1683
1684 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1685                                               const struct nlattr *attr)
1686 {
1687         struct net_device *dev;
1688         char ifname[IFNAMSIZ];
1689         struct nft_hook *hook;
1690         int err;
1691
1692         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1693         if (!hook) {
1694                 err = -ENOMEM;
1695                 goto err_hook_alloc;
1696         }
1697
1698         nla_strlcpy(ifname, attr, IFNAMSIZ);
1699         dev = __dev_get_by_name(net, ifname);
1700         if (!dev) {
1701                 err = -ENOENT;
1702                 goto err_hook_dev;
1703         }
1704         hook->ops.dev = dev;
1705         hook->inactive = false;
1706
1707         return hook;
1708
1709 err_hook_dev:
1710         kfree(hook);
1711 err_hook_alloc:
1712         return ERR_PTR(err);
1713 }
1714
1715 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1716                                            const struct nft_hook *this)
1717 {
1718         struct nft_hook *hook;
1719
1720         list_for_each_entry(hook, hook_list, list) {
1721                 if (this->ops.dev == hook->ops.dev)
1722                         return hook;
1723         }
1724
1725         return NULL;
1726 }
1727
1728 static int nf_tables_parse_netdev_hooks(struct net *net,
1729                                         const struct nlattr *attr,
1730                                         struct list_head *hook_list)
1731 {
1732         struct nft_hook *hook, *next;
1733         const struct nlattr *tmp;
1734         int rem, n = 0, err;
1735
1736         nla_for_each_nested(tmp, attr, rem) {
1737                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1738                         err = -EINVAL;
1739                         goto err_hook;
1740                 }
1741
1742                 hook = nft_netdev_hook_alloc(net, tmp);
1743                 if (IS_ERR(hook)) {
1744                         err = PTR_ERR(hook);
1745                         goto err_hook;
1746                 }
1747                 if (nft_hook_list_find(hook_list, hook)) {
1748                         kfree(hook);
1749                         err = -EEXIST;
1750                         goto err_hook;
1751                 }
1752                 list_add_tail(&hook->list, hook_list);
1753                 n++;
1754
1755                 if (n == NFT_NETDEVICE_MAX) {
1756                         err = -EFBIG;
1757                         goto err_hook;
1758                 }
1759         }
1760
1761         return 0;
1762
1763 err_hook:
1764         list_for_each_entry_safe(hook, next, hook_list, list) {
1765                 list_del(&hook->list);
1766                 kfree(hook);
1767         }
1768         return err;
1769 }
1770
1771 struct nft_chain_hook {
1772         u32                             num;
1773         s32                             priority;
1774         const struct nft_chain_type     *type;
1775         struct list_head                list;
1776 };
1777
1778 static int nft_chain_parse_netdev(struct net *net,
1779                                   struct nlattr *tb[],
1780                                   struct list_head *hook_list)
1781 {
1782         struct nft_hook *hook;
1783         int err;
1784
1785         if (tb[NFTA_HOOK_DEV]) {
1786                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1787                 if (IS_ERR(hook))
1788                         return PTR_ERR(hook);
1789
1790                 list_add_tail(&hook->list, hook_list);
1791         } else if (tb[NFTA_HOOK_DEVS]) {
1792                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1793                                                    hook_list);
1794                 if (err < 0)
1795                         return err;
1796
1797                 if (list_empty(hook_list))
1798                         return -EINVAL;
1799         } else {
1800                 return -EINVAL;
1801         }
1802
1803         return 0;
1804 }
1805
1806 static int nft_chain_parse_hook(struct net *net,
1807                                 const struct nlattr * const nla[],
1808                                 struct nft_chain_hook *hook, u8 family,
1809                                 bool autoload)
1810 {
1811         struct nlattr *ha[NFTA_HOOK_MAX + 1];
1812         const struct nft_chain_type *type;
1813         int err;
1814
1815         lockdep_assert_held(&net->nft.commit_mutex);
1816         lockdep_nfnl_nft_mutex_not_held();
1817
1818         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1819                                           nla[NFTA_CHAIN_HOOK],
1820                                           nft_hook_policy, NULL);
1821         if (err < 0)
1822                 return err;
1823
1824         if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1825             ha[NFTA_HOOK_PRIORITY] == NULL)
1826                 return -EINVAL;
1827
1828         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1829         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1830
1831         type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1832         if (!type)
1833                 return -EOPNOTSUPP;
1834
1835         if (nla[NFTA_CHAIN_TYPE]) {
1836                 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1837                                                    family, autoload);
1838                 if (IS_ERR(type))
1839                         return PTR_ERR(type);
1840         }
1841         if (hook->num > NF_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1842                 return -EOPNOTSUPP;
1843
1844         if (type->type == NFT_CHAIN_T_NAT &&
1845             hook->priority <= NF_IP_PRI_CONNTRACK)
1846                 return -EOPNOTSUPP;
1847
1848         if (!try_module_get(type->owner))
1849                 return -ENOENT;
1850
1851         hook->type = type;
1852
1853         INIT_LIST_HEAD(&hook->list);
1854         if (family == NFPROTO_NETDEV) {
1855                 err = nft_chain_parse_netdev(net, ha, &hook->list);
1856                 if (err < 0) {
1857                         module_put(type->owner);
1858                         return err;
1859                 }
1860         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
1861                 module_put(type->owner);
1862                 return -EOPNOTSUPP;
1863         }
1864
1865         return 0;
1866 }
1867
1868 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1869 {
1870         struct nft_hook *h, *next;
1871
1872         list_for_each_entry_safe(h, next, &hook->list, list) {
1873                 list_del(&h->list);
1874                 kfree(h);
1875         }
1876         module_put(hook->type->owner);
1877 }
1878
1879 struct nft_rules_old {
1880         struct rcu_head h;
1881         struct nft_rule **start;
1882 };
1883
1884 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1885                                                      unsigned int alloc)
1886 {
1887         if (alloc > INT_MAX)
1888                 return NULL;
1889
1890         alloc += 1;     /* NULL, ends rules */
1891         if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1892                 return NULL;
1893
1894         alloc *= sizeof(struct nft_rule *);
1895         alloc += sizeof(struct nft_rules_old);
1896
1897         return kvmalloc(alloc, GFP_KERNEL);
1898 }
1899
1900 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
1901                                     const struct nft_chain_hook *hook,
1902                                     struct nft_chain *chain)
1903 {
1904         ops->pf         = family;
1905         ops->hooknum    = hook->num;
1906         ops->priority   = hook->priority;
1907         ops->priv       = chain;
1908         ops->hook       = hook->type->hooks[ops->hooknum];
1909 }
1910
1911 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
1912                               struct nft_chain_hook *hook, u32 flags)
1913 {
1914         struct nft_chain *chain;
1915         struct nft_hook *h;
1916
1917         basechain->type = hook->type;
1918         INIT_LIST_HEAD(&basechain->hook_list);
1919         chain = &basechain->chain;
1920
1921         if (family == NFPROTO_NETDEV) {
1922                 list_splice_init(&hook->list, &basechain->hook_list);
1923                 list_for_each_entry(h, &basechain->hook_list, list)
1924                         nft_basechain_hook_init(&h->ops, family, hook, chain);
1925
1926                 basechain->ops.hooknum  = hook->num;
1927                 basechain->ops.priority = hook->priority;
1928         } else {
1929                 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
1930         }
1931
1932         chain->flags |= NFT_CHAIN_BASE | flags;
1933         basechain->policy = NF_ACCEPT;
1934         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
1935             nft_chain_offload_priority(basechain) < 0)
1936                 return -EOPNOTSUPP;
1937
1938         flow_block_init(&basechain->flow_block);
1939
1940         return 0;
1941 }
1942
1943 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
1944 {
1945         int err;
1946
1947         err = rhltable_insert_key(&table->chains_ht, chain->name,
1948                                   &chain->rhlhead, nft_chain_ht_params);
1949         if (err)
1950                 return err;
1951
1952         list_add_tail_rcu(&chain->list, &table->chains);
1953
1954         return 0;
1955 }
1956
1957 static u64 chain_id;
1958
1959 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1960                               u8 policy, u32 flags)
1961 {
1962         const struct nlattr * const *nla = ctx->nla;
1963         struct nft_table *table = ctx->table;
1964         struct nft_base_chain *basechain;
1965         struct nft_stats __percpu *stats;
1966         struct net *net = ctx->net;
1967         char name[NFT_NAME_MAXLEN];
1968         struct nft_trans *trans;
1969         struct nft_chain *chain;
1970         struct nft_rule **rules;
1971         int err;
1972
1973         if (table->use == UINT_MAX)
1974                 return -EOVERFLOW;
1975
1976         if (nla[NFTA_CHAIN_HOOK]) {
1977                 struct nft_chain_hook hook;
1978
1979                 if (flags & NFT_CHAIN_BINDING)
1980                         return -EOPNOTSUPP;
1981
1982                 err = nft_chain_parse_hook(net, nla, &hook, family, true);
1983                 if (err < 0)
1984                         return err;
1985
1986                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1987                 if (basechain == NULL) {
1988                         nft_chain_release_hook(&hook);
1989                         return -ENOMEM;
1990                 }
1991                 chain = &basechain->chain;
1992
1993                 if (nla[NFTA_CHAIN_COUNTERS]) {
1994                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1995                         if (IS_ERR(stats)) {
1996                                 nft_chain_release_hook(&hook);
1997                                 kfree(basechain);
1998                                 return PTR_ERR(stats);
1999                         }
2000                         rcu_assign_pointer(basechain->stats, stats);
2001                         static_branch_inc(&nft_counters_enabled);
2002                 }
2003
2004                 err = nft_basechain_init(basechain, family, &hook, flags);
2005                 if (err < 0) {
2006                         nft_chain_release_hook(&hook);
2007                         kfree(basechain);
2008                         return err;
2009                 }
2010         } else {
2011                 if (flags & NFT_CHAIN_BASE)
2012                         return -EINVAL;
2013                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2014                         return -EOPNOTSUPP;
2015
2016                 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2017                 if (chain == NULL)
2018                         return -ENOMEM;
2019
2020                 chain->flags = flags;
2021         }
2022         ctx->chain = chain;
2023
2024         INIT_LIST_HEAD(&chain->rules);
2025         chain->handle = nf_tables_alloc_handle(table);
2026         chain->table = table;
2027
2028         if (nla[NFTA_CHAIN_NAME]) {
2029                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2030         } else {
2031                 if (!(flags & NFT_CHAIN_BINDING)) {
2032                         err = -EINVAL;
2033                         goto err1;
2034                 }
2035
2036                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2037                 chain->name = kstrdup(name, GFP_KERNEL);
2038         }
2039
2040         if (!chain->name) {
2041                 err = -ENOMEM;
2042                 goto err1;
2043         }
2044
2045         rules = nf_tables_chain_alloc_rules(chain, 0);
2046         if (!rules) {
2047                 err = -ENOMEM;
2048                 goto err1;
2049         }
2050
2051         *rules = NULL;
2052         rcu_assign_pointer(chain->rules_gen_0, rules);
2053         rcu_assign_pointer(chain->rules_gen_1, rules);
2054
2055         err = nf_tables_register_hook(net, table, chain);
2056         if (err < 0)
2057                 goto err1;
2058
2059         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2060         if (IS_ERR(trans)) {
2061                 err = PTR_ERR(trans);
2062                 goto err2;
2063         }
2064
2065         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2066         if (nft_is_base_chain(chain))
2067                 nft_trans_chain_policy(trans) = policy;
2068
2069         err = nft_chain_add(table, chain);
2070         if (err < 0) {
2071                 nft_trans_destroy(trans);
2072                 goto err2;
2073         }
2074
2075         table->use++;
2076
2077         return 0;
2078 err2:
2079         nf_tables_unregister_hook(net, table, chain);
2080 err1:
2081         nf_tables_chain_destroy(ctx);
2082
2083         return err;
2084 }
2085
2086 static bool nft_hook_list_equal(struct list_head *hook_list1,
2087                                 struct list_head *hook_list2)
2088 {
2089         struct nft_hook *hook;
2090         int n = 0, m = 0;
2091
2092         n = 0;
2093         list_for_each_entry(hook, hook_list2, list) {
2094                 if (!nft_hook_list_find(hook_list1, hook))
2095                         return false;
2096
2097                 n++;
2098         }
2099         list_for_each_entry(hook, hook_list1, list)
2100                 m++;
2101
2102         return n == m;
2103 }
2104
2105 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2106                               u32 flags)
2107 {
2108         const struct nlattr * const *nla = ctx->nla;
2109         struct nft_table *table = ctx->table;
2110         struct nft_chain *chain = ctx->chain;
2111         struct nft_base_chain *basechain;
2112         struct nft_stats *stats = NULL;
2113         struct nft_chain_hook hook;
2114         struct nf_hook_ops *ops;
2115         struct nft_trans *trans;
2116         int err;
2117
2118         if (chain->flags ^ flags)
2119                 return -EOPNOTSUPP;
2120
2121         if (nla[NFTA_CHAIN_HOOK]) {
2122                 if (!nft_is_base_chain(chain))
2123                         return -EEXIST;
2124
2125                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2126                                            false);
2127                 if (err < 0)
2128                         return err;
2129
2130                 basechain = nft_base_chain(chain);
2131                 if (basechain->type != hook.type) {
2132                         nft_chain_release_hook(&hook);
2133                         return -EEXIST;
2134                 }
2135
2136                 if (ctx->family == NFPROTO_NETDEV) {
2137                         if (!nft_hook_list_equal(&basechain->hook_list,
2138                                                  &hook.list)) {
2139                                 nft_chain_release_hook(&hook);
2140                                 return -EEXIST;
2141                         }
2142                 } else {
2143                         ops = &basechain->ops;
2144                         if (ops->hooknum != hook.num ||
2145                             ops->priority != hook.priority) {
2146                                 nft_chain_release_hook(&hook);
2147                                 return -EEXIST;
2148                         }
2149                 }
2150                 nft_chain_release_hook(&hook);
2151         }
2152
2153         if (nla[NFTA_CHAIN_HANDLE] &&
2154             nla[NFTA_CHAIN_NAME]) {
2155                 struct nft_chain *chain2;
2156
2157                 chain2 = nft_chain_lookup(ctx->net, table,
2158                                           nla[NFTA_CHAIN_NAME], genmask);
2159                 if (!IS_ERR(chain2))
2160                         return -EEXIST;
2161         }
2162
2163         if (nla[NFTA_CHAIN_COUNTERS]) {
2164                 if (!nft_is_base_chain(chain))
2165                         return -EOPNOTSUPP;
2166
2167                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2168                 if (IS_ERR(stats))
2169                         return PTR_ERR(stats);
2170         }
2171
2172         err = -ENOMEM;
2173         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2174                                 sizeof(struct nft_trans_chain));
2175         if (trans == NULL)
2176                 goto err;
2177
2178         nft_trans_chain_stats(trans) = stats;
2179         nft_trans_chain_update(trans) = true;
2180
2181         if (nla[NFTA_CHAIN_POLICY])
2182                 nft_trans_chain_policy(trans) = policy;
2183         else
2184                 nft_trans_chain_policy(trans) = -1;
2185
2186         if (nla[NFTA_CHAIN_HANDLE] &&
2187             nla[NFTA_CHAIN_NAME]) {
2188                 struct nft_trans *tmp;
2189                 char *name;
2190
2191                 err = -ENOMEM;
2192                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2193                 if (!name)
2194                         goto err;
2195
2196                 err = -EEXIST;
2197                 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
2198                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2199                             tmp->ctx.table == table &&
2200                             nft_trans_chain_update(tmp) &&
2201                             nft_trans_chain_name(tmp) &&
2202                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2203                                 kfree(name);
2204                                 goto err;
2205                         }
2206                 }
2207
2208                 nft_trans_chain_name(trans) = name;
2209         }
2210         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2211
2212         return 0;
2213 err:
2214         free_percpu(stats);
2215         kfree(trans);
2216         return err;
2217 }
2218
2219 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2220                                                const struct nlattr *nla)
2221 {
2222         u32 id = ntohl(nla_get_be32(nla));
2223         struct nft_trans *trans;
2224
2225         list_for_each_entry(trans, &net->nft.commit_list, list) {
2226                 struct nft_chain *chain = trans->ctx.chain;
2227
2228                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2229                     id == nft_trans_chain_id(trans))
2230                         return chain;
2231         }
2232         return ERR_PTR(-ENOENT);
2233 }
2234
2235 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
2236                               struct sk_buff *skb, const struct nlmsghdr *nlh,
2237                               const struct nlattr * const nla[],
2238                               struct netlink_ext_ack *extack)
2239 {
2240         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2241         u8 genmask = nft_genmask_next(net);
2242         int family = nfmsg->nfgen_family;
2243         struct nft_chain *chain = NULL;
2244         const struct nlattr *attr;
2245         struct nft_table *table;
2246         u8 policy = NF_ACCEPT;
2247         struct nft_ctx ctx;
2248         u64 handle = 0;
2249         u32 flags = 0;
2250
2251         lockdep_assert_held(&net->nft.commit_mutex);
2252
2253         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2254         if (IS_ERR(table)) {
2255                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2256                 return PTR_ERR(table);
2257         }
2258
2259         chain = NULL;
2260         attr = nla[NFTA_CHAIN_NAME];
2261
2262         if (nla[NFTA_CHAIN_HANDLE]) {
2263                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2264                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2265                 if (IS_ERR(chain)) {
2266                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2267                         return PTR_ERR(chain);
2268                 }
2269                 attr = nla[NFTA_CHAIN_HANDLE];
2270         } else if (nla[NFTA_CHAIN_NAME]) {
2271                 chain = nft_chain_lookup(net, table, attr, genmask);
2272                 if (IS_ERR(chain)) {
2273                         if (PTR_ERR(chain) != -ENOENT) {
2274                                 NL_SET_BAD_ATTR(extack, attr);
2275                                 return PTR_ERR(chain);
2276                         }
2277                         chain = NULL;
2278                 }
2279         } else if (!nla[NFTA_CHAIN_ID]) {
2280                 return -EINVAL;
2281         }
2282
2283         if (nla[NFTA_CHAIN_POLICY]) {
2284                 if (chain != NULL &&
2285                     !nft_is_base_chain(chain)) {
2286                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2287                         return -EOPNOTSUPP;
2288                 }
2289
2290                 if (chain == NULL &&
2291                     nla[NFTA_CHAIN_HOOK] == NULL) {
2292                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2293                         return -EOPNOTSUPP;
2294                 }
2295
2296                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2297                 switch (policy) {
2298                 case NF_DROP:
2299                 case NF_ACCEPT:
2300                         break;
2301                 default:
2302                         return -EINVAL;
2303                 }
2304         }
2305
2306         if (nla[NFTA_CHAIN_FLAGS])
2307                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2308         else if (chain)
2309                 flags = chain->flags;
2310
2311         if (flags & ~NFT_CHAIN_FLAGS)
2312                 return -EOPNOTSUPP;
2313
2314         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2315
2316         if (chain != NULL) {
2317                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2318                         NL_SET_BAD_ATTR(extack, attr);
2319                         return -EEXIST;
2320                 }
2321                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2322                         return -EOPNOTSUPP;
2323
2324                 flags |= chain->flags & NFT_CHAIN_BASE;
2325                 return nf_tables_updchain(&ctx, genmask, policy, flags);
2326         }
2327
2328         return nf_tables_addchain(&ctx, family, genmask, policy, flags);
2329 }
2330
2331 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
2332                               struct sk_buff *skb, const struct nlmsghdr *nlh,
2333                               const struct nlattr * const nla[],
2334                               struct netlink_ext_ack *extack)
2335 {
2336         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2337         u8 genmask = nft_genmask_next(net);
2338         int family = nfmsg->nfgen_family;
2339         const struct nlattr *attr;
2340         struct nft_table *table;
2341         struct nft_chain *chain;
2342         struct nft_rule *rule;
2343         struct nft_ctx ctx;
2344         u64 handle;
2345         u32 use;
2346         int err;
2347
2348         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2349         if (IS_ERR(table)) {
2350                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2351                 return PTR_ERR(table);
2352         }
2353
2354         if (nla[NFTA_CHAIN_HANDLE]) {
2355                 attr = nla[NFTA_CHAIN_HANDLE];
2356                 handle = be64_to_cpu(nla_get_be64(attr));
2357                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2358         } else {
2359                 attr = nla[NFTA_CHAIN_NAME];
2360                 chain = nft_chain_lookup(net, table, attr, genmask);
2361         }
2362         if (IS_ERR(chain)) {
2363                 NL_SET_BAD_ATTR(extack, attr);
2364                 return PTR_ERR(chain);
2365         }
2366
2367         if (nlh->nlmsg_flags & NLM_F_NONREC &&
2368             chain->use > 0)
2369                 return -EBUSY;
2370
2371         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2372
2373         use = chain->use;
2374         list_for_each_entry(rule, &chain->rules, list) {
2375                 if (!nft_is_active_next(net, rule))
2376                         continue;
2377                 use--;
2378
2379                 err = nft_delrule(&ctx, rule);
2380                 if (err < 0)
2381                         return err;
2382         }
2383
2384         /* There are rules and elements that are still holding references to us,
2385          * we cannot do a recursive removal in this case.
2386          */
2387         if (use > 0) {
2388                 NL_SET_BAD_ATTR(extack, attr);
2389                 return -EBUSY;
2390         }
2391
2392         return nft_delchain(&ctx);
2393 }
2394
2395 /*
2396  * Expressions
2397  */
2398
2399 /**
2400  *      nft_register_expr - register nf_tables expr type
2401  *      @type: expr type
2402  *
2403  *      Registers the expr type for use with nf_tables. Returns zero on
2404  *      success or a negative errno code otherwise.
2405  */
2406 int nft_register_expr(struct nft_expr_type *type)
2407 {
2408         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2409         if (type->family == NFPROTO_UNSPEC)
2410                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2411         else
2412                 list_add_rcu(&type->list, &nf_tables_expressions);
2413         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2414         return 0;
2415 }
2416 EXPORT_SYMBOL_GPL(nft_register_expr);
2417
2418 /**
2419  *      nft_unregister_expr - unregister nf_tables expr type
2420  *      @type: expr type
2421  *
2422  *      Unregisters the expr typefor use with nf_tables.
2423  */
2424 void nft_unregister_expr(struct nft_expr_type *type)
2425 {
2426         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2427         list_del_rcu(&type->list);
2428         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2429 }
2430 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2431
2432 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2433                                                        struct nlattr *nla)
2434 {
2435         const struct nft_expr_type *type, *candidate = NULL;
2436
2437         list_for_each_entry(type, &nf_tables_expressions, list) {
2438                 if (!nla_strcmp(nla, type->name)) {
2439                         if (!type->family && !candidate)
2440                                 candidate = type;
2441                         else if (type->family == family)
2442                                 candidate = type;
2443                 }
2444         }
2445         return candidate;
2446 }
2447
2448 #ifdef CONFIG_MODULES
2449 static int nft_expr_type_request_module(struct net *net, u8 family,
2450                                         struct nlattr *nla)
2451 {
2452         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2453                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2454                 return -EAGAIN;
2455
2456         return 0;
2457 }
2458 #endif
2459
2460 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2461                                                      u8 family,
2462                                                      struct nlattr *nla)
2463 {
2464         const struct nft_expr_type *type;
2465
2466         if (nla == NULL)
2467                 return ERR_PTR(-EINVAL);
2468
2469         type = __nft_expr_type_get(family, nla);
2470         if (type != NULL && try_module_get(type->owner))
2471                 return type;
2472
2473         lockdep_nfnl_nft_mutex_not_held();
2474 #ifdef CONFIG_MODULES
2475         if (type == NULL) {
2476                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2477                         return ERR_PTR(-EAGAIN);
2478
2479                 if (nft_request_module(net, "nft-expr-%.*s",
2480                                        nla_len(nla),
2481                                        (char *)nla_data(nla)) == -EAGAIN)
2482                         return ERR_PTR(-EAGAIN);
2483         }
2484 #endif
2485         return ERR_PTR(-ENOENT);
2486 }
2487
2488 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2489         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2490                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2491         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2492 };
2493
2494 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2495                                     const struct nft_expr *expr)
2496 {
2497         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2498                 goto nla_put_failure;
2499
2500         if (expr->ops->dump) {
2501                 struct nlattr *data = nla_nest_start_noflag(skb,
2502                                                             NFTA_EXPR_DATA);
2503                 if (data == NULL)
2504                         goto nla_put_failure;
2505                 if (expr->ops->dump(skb, expr) < 0)
2506                         goto nla_put_failure;
2507                 nla_nest_end(skb, data);
2508         }
2509
2510         return skb->len;
2511
2512 nla_put_failure:
2513         return -1;
2514 };
2515
2516 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2517                   const struct nft_expr *expr)
2518 {
2519         struct nlattr *nest;
2520
2521         nest = nla_nest_start_noflag(skb, attr);
2522         if (!nest)
2523                 goto nla_put_failure;
2524         if (nf_tables_fill_expr_info(skb, expr) < 0)
2525                 goto nla_put_failure;
2526         nla_nest_end(skb, nest);
2527         return 0;
2528
2529 nla_put_failure:
2530         return -1;
2531 }
2532
2533 struct nft_expr_info {
2534         const struct nft_expr_ops       *ops;
2535         const struct nlattr             *attr;
2536         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2537 };
2538
2539 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2540                                 const struct nlattr *nla,
2541                                 struct nft_expr_info *info)
2542 {
2543         const struct nft_expr_type *type;
2544         const struct nft_expr_ops *ops;
2545         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2546         int err;
2547
2548         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2549                                           nft_expr_policy, NULL);
2550         if (err < 0)
2551                 return err;
2552
2553         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2554         if (IS_ERR(type))
2555                 return PTR_ERR(type);
2556
2557         if (tb[NFTA_EXPR_DATA]) {
2558                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2559                                                   tb[NFTA_EXPR_DATA],
2560                                                   type->policy, NULL);
2561                 if (err < 0)
2562                         goto err1;
2563         } else
2564                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2565
2566         if (type->select_ops != NULL) {
2567                 ops = type->select_ops(ctx,
2568                                        (const struct nlattr * const *)info->tb);
2569                 if (IS_ERR(ops)) {
2570                         err = PTR_ERR(ops);
2571 #ifdef CONFIG_MODULES
2572                         if (err == -EAGAIN)
2573                                 if (nft_expr_type_request_module(ctx->net,
2574                                                                  ctx->family,
2575                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2576                                         err = -ENOENT;
2577 #endif
2578                         goto err1;
2579                 }
2580         } else
2581                 ops = type->ops;
2582
2583         info->attr = nla;
2584         info->ops = ops;
2585
2586         return 0;
2587
2588 err1:
2589         module_put(type->owner);
2590         return err;
2591 }
2592
2593 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2594                              const struct nft_expr_info *info,
2595                              struct nft_expr *expr)
2596 {
2597         const struct nft_expr_ops *ops = info->ops;
2598         int err;
2599
2600         expr->ops = ops;
2601         if (ops->init) {
2602                 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2603                 if (err < 0)
2604                         goto err1;
2605         }
2606
2607         return 0;
2608 err1:
2609         expr->ops = NULL;
2610         return err;
2611 }
2612
2613 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2614                                    struct nft_expr *expr)
2615 {
2616         const struct nft_expr_type *type = expr->ops->type;
2617
2618         if (expr->ops->destroy)
2619                 expr->ops->destroy(ctx, expr);
2620         module_put(type->owner);
2621 }
2622
2623 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2624                                       const struct nlattr *nla)
2625 {
2626         struct nft_expr_info info;
2627         struct nft_expr *expr;
2628         struct module *owner;
2629         int err;
2630
2631         err = nf_tables_expr_parse(ctx, nla, &info);
2632         if (err < 0)
2633                 goto err1;
2634
2635         err = -ENOMEM;
2636         expr = kzalloc(info.ops->size, GFP_KERNEL);
2637         if (expr == NULL)
2638                 goto err2;
2639
2640         err = nf_tables_newexpr(ctx, &info, expr);
2641         if (err < 0)
2642                 goto err3;
2643
2644         return expr;
2645 err3:
2646         kfree(expr);
2647 err2:
2648         owner = info.ops->type->owner;
2649         if (info.ops->type->release_ops)
2650                 info.ops->type->release_ops(info.ops);
2651
2652         module_put(owner);
2653 err1:
2654         return ERR_PTR(err);
2655 }
2656
2657 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2658 {
2659         int err;
2660
2661         if (src->ops->clone) {
2662                 dst->ops = src->ops;
2663                 err = src->ops->clone(dst, src);
2664                 if (err < 0)
2665                         return err;
2666         } else {
2667                 memcpy(dst, src, src->ops->size);
2668         }
2669
2670         __module_get(src->ops->type->owner);
2671
2672         return 0;
2673 }
2674
2675 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2676 {
2677         nf_tables_expr_destroy(ctx, expr);
2678         kfree(expr);
2679 }
2680
2681 /*
2682  * Rules
2683  */
2684
2685 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2686                                           u64 handle)
2687 {
2688         struct nft_rule *rule;
2689
2690         // FIXME: this sucks
2691         list_for_each_entry_rcu(rule, &chain->rules, list) {
2692                 if (handle == rule->handle)
2693                         return rule;
2694         }
2695
2696         return ERR_PTR(-ENOENT);
2697 }
2698
2699 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2700                                         const struct nlattr *nla)
2701 {
2702         if (nla == NULL)
2703                 return ERR_PTR(-EINVAL);
2704
2705         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2706 }
2707
2708 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2709         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
2710                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
2711         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
2712                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
2713         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
2714         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2715         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
2716         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
2717         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
2718                                     .len = NFT_USERDATA_MAXLEN },
2719         [NFTA_RULE_ID]          = { .type = NLA_U32 },
2720         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2721         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
2722 };
2723
2724 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2725                                     u32 portid, u32 seq, int event,
2726                                     u32 flags, int family,
2727                                     const struct nft_table *table,
2728                                     const struct nft_chain *chain,
2729                                     const struct nft_rule *rule,
2730                                     const struct nft_rule *prule)
2731 {
2732         struct nlmsghdr *nlh;
2733         struct nfgenmsg *nfmsg;
2734         const struct nft_expr *expr, *next;
2735         struct nlattr *list;
2736         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2737
2738         nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2739         if (nlh == NULL)
2740                 goto nla_put_failure;
2741
2742         nfmsg = nlmsg_data(nlh);
2743         nfmsg->nfgen_family     = family;
2744         nfmsg->version          = NFNETLINK_V0;
2745         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
2746
2747         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2748                 goto nla_put_failure;
2749         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2750                 goto nla_put_failure;
2751         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2752                          NFTA_RULE_PAD))
2753                 goto nla_put_failure;
2754
2755         if (event != NFT_MSG_DELRULE && prule) {
2756                 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2757                                  cpu_to_be64(prule->handle),
2758                                  NFTA_RULE_PAD))
2759                         goto nla_put_failure;
2760         }
2761
2762         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2763         if (list == NULL)
2764                 goto nla_put_failure;
2765         nft_rule_for_each_expr(expr, next, rule) {
2766                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2767                         goto nla_put_failure;
2768         }
2769         nla_nest_end(skb, list);
2770
2771         if (rule->udata) {
2772                 struct nft_userdata *udata = nft_userdata(rule);
2773                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2774                             udata->data) < 0)
2775                         goto nla_put_failure;
2776         }
2777
2778         nlmsg_end(skb, nlh);
2779         return 0;
2780
2781 nla_put_failure:
2782         nlmsg_trim(skb, nlh);
2783         return -1;
2784 }
2785
2786 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2787                                   const struct nft_rule *rule, int event)
2788 {
2789         struct sk_buff *skb;
2790         int err;
2791         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
2792                               ctx->table->name, ctx->table->handle,
2793                               ctx->chain->name, ctx->chain->handle);
2794
2795         audit_log_nfcfg(buf,
2796                         ctx->family,
2797                         rule->handle,
2798                         event == NFT_MSG_NEWRULE ?
2799                                 AUDIT_NFT_OP_RULE_REGISTER :
2800                                 AUDIT_NFT_OP_RULE_UNREGISTER,
2801                         GFP_KERNEL);
2802         kfree(buf);
2803
2804         if (!ctx->report &&
2805             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2806                 return;
2807
2808         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2809         if (skb == NULL)
2810                 goto err;
2811
2812         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2813                                        event, 0, ctx->family, ctx->table,
2814                                        ctx->chain, rule, NULL);
2815         if (err < 0) {
2816                 kfree_skb(skb);
2817                 goto err;
2818         }
2819
2820         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
2821         return;
2822 err:
2823         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2824 }
2825
2826 struct nft_rule_dump_ctx {
2827         char *table;
2828         char *chain;
2829 };
2830
2831 static int __nf_tables_dump_rules(struct sk_buff *skb,
2832                                   unsigned int *idx,
2833                                   struct netlink_callback *cb,
2834                                   const struct nft_table *table,
2835                                   const struct nft_chain *chain)
2836 {
2837         struct net *net = sock_net(skb->sk);
2838         const struct nft_rule *rule, *prule;
2839         unsigned int s_idx = cb->args[0];
2840
2841         prule = NULL;
2842         list_for_each_entry_rcu(rule, &chain->rules, list) {
2843                 if (!nft_is_active(net, rule))
2844                         goto cont_skip;
2845                 if (*idx < s_idx)
2846                         goto cont;
2847                 if (*idx > s_idx) {
2848                         memset(&cb->args[1], 0,
2849                                         sizeof(cb->args) - sizeof(cb->args[0]));
2850                 }
2851                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2852                                         cb->nlh->nlmsg_seq,
2853                                         NFT_MSG_NEWRULE,
2854                                         NLM_F_MULTI | NLM_F_APPEND,
2855                                         table->family,
2856                                         table, chain, rule, prule) < 0)
2857                         return 1;
2858
2859                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2860 cont:
2861                 prule = rule;
2862 cont_skip:
2863                 (*idx)++;
2864         }
2865         return 0;
2866 }
2867
2868 static int nf_tables_dump_rules(struct sk_buff *skb,
2869                                 struct netlink_callback *cb)
2870 {
2871         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2872         const struct nft_rule_dump_ctx *ctx = cb->data;
2873         struct nft_table *table;
2874         const struct nft_chain *chain;
2875         unsigned int idx = 0;
2876         struct net *net = sock_net(skb->sk);
2877         int family = nfmsg->nfgen_family;
2878
2879         rcu_read_lock();
2880         cb->seq = net->nft.base_seq;
2881
2882         list_for_each_entry_rcu(table, &net->nft.tables, list) {
2883                 if (family != NFPROTO_UNSPEC && family != table->family)
2884                         continue;
2885
2886                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2887                         continue;
2888
2889                 if (ctx && ctx->table && ctx->chain) {
2890                         struct rhlist_head *list, *tmp;
2891
2892                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
2893                                                nft_chain_ht_params);
2894                         if (!list)
2895                                 goto done;
2896
2897                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2898                                 if (!nft_is_active(net, chain))
2899                                         continue;
2900                                 __nf_tables_dump_rules(skb, &idx,
2901                                                        cb, table, chain);
2902                                 break;
2903                         }
2904                         goto done;
2905                 }
2906
2907                 list_for_each_entry_rcu(chain, &table->chains, list) {
2908                         if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2909                                 goto done;
2910                 }
2911
2912                 if (ctx && ctx->table)
2913                         break;
2914         }
2915 done:
2916         rcu_read_unlock();
2917
2918         cb->args[0] = idx;
2919         return skb->len;
2920 }
2921
2922 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2923 {
2924         const struct nlattr * const *nla = cb->data;
2925         struct nft_rule_dump_ctx *ctx = NULL;
2926
2927         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2928                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2929                 if (!ctx)
2930                         return -ENOMEM;
2931
2932                 if (nla[NFTA_RULE_TABLE]) {
2933                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2934                                                         GFP_ATOMIC);
2935                         if (!ctx->table) {
2936                                 kfree(ctx);
2937                                 return -ENOMEM;
2938                         }
2939                 }
2940                 if (nla[NFTA_RULE_CHAIN]) {
2941                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2942                                                 GFP_ATOMIC);
2943                         if (!ctx->chain) {
2944                                 kfree(ctx->table);
2945                                 kfree(ctx);
2946                                 return -ENOMEM;
2947                         }
2948                 }
2949         }
2950
2951         cb->data = ctx;
2952         return 0;
2953 }
2954
2955 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2956 {
2957         struct nft_rule_dump_ctx *ctx = cb->data;
2958
2959         if (ctx) {
2960                 kfree(ctx->table);
2961                 kfree(ctx->chain);
2962                 kfree(ctx);
2963         }
2964         return 0;
2965 }
2966
2967 /* called with rcu_read_lock held */
2968 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2969                              struct sk_buff *skb, const struct nlmsghdr *nlh,
2970                              const struct nlattr * const nla[],
2971                              struct netlink_ext_ack *extack)
2972 {
2973         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2974         u8 genmask = nft_genmask_cur(net);
2975         const struct nft_chain *chain;
2976         const struct nft_rule *rule;
2977         struct nft_table *table;
2978         struct sk_buff *skb2;
2979         int family = nfmsg->nfgen_family;
2980         int err;
2981
2982         if (nlh->nlmsg_flags & NLM_F_DUMP) {
2983                 struct netlink_dump_control c = {
2984                         .start= nf_tables_dump_rules_start,
2985                         .dump = nf_tables_dump_rules,
2986                         .done = nf_tables_dump_rules_done,
2987                         .module = THIS_MODULE,
2988                         .data = (void *)nla,
2989                 };
2990
2991                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
2992         }
2993
2994         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2995         if (IS_ERR(table)) {
2996                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2997                 return PTR_ERR(table);
2998         }
2999
3000         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3001         if (IS_ERR(chain)) {
3002                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3003                 return PTR_ERR(chain);
3004         }
3005
3006         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3007         if (IS_ERR(rule)) {
3008                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3009                 return PTR_ERR(rule);
3010         }
3011
3012         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3013         if (!skb2)
3014                 return -ENOMEM;
3015
3016         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3017                                        nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3018                                        family, table, chain, rule, NULL);
3019         if (err < 0)
3020                 goto err_fill_rule_info;
3021
3022         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3023
3024 err_fill_rule_info:
3025         kfree_skb(skb2);
3026         return err;
3027 }
3028
3029 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3030                                    struct nft_rule *rule)
3031 {
3032         struct nft_expr *expr, *next;
3033
3034         /*
3035          * Careful: some expressions might not be initialized in case this
3036          * is called on error from nf_tables_newrule().
3037          */
3038         expr = nft_expr_first(rule);
3039         while (expr != nft_expr_last(rule) && expr->ops) {
3040                 next = nft_expr_next(expr);
3041                 nf_tables_expr_destroy(ctx, expr);
3042                 expr = next;
3043         }
3044         kfree(rule);
3045 }
3046
3047 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3048 {
3049         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3050         nf_tables_rule_destroy(ctx, rule);
3051 }
3052
3053 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3054 {
3055         struct nft_expr *expr, *last;
3056         const struct nft_data *data;
3057         struct nft_rule *rule;
3058         int err;
3059
3060         if (ctx->level == NFT_JUMP_STACK_SIZE)
3061                 return -EMLINK;
3062
3063         list_for_each_entry(rule, &chain->rules, list) {
3064                 if (!nft_is_active_next(ctx->net, rule))
3065                         continue;
3066
3067                 nft_rule_for_each_expr(expr, last, rule) {
3068                         if (!expr->ops->validate)
3069                                 continue;
3070
3071                         err = expr->ops->validate(ctx, expr, &data);
3072                         if (err < 0)
3073                                 return err;
3074                 }
3075         }
3076
3077         return 0;
3078 }
3079 EXPORT_SYMBOL_GPL(nft_chain_validate);
3080
3081 static int nft_table_validate(struct net *net, const struct nft_table *table)
3082 {
3083         struct nft_chain *chain;
3084         struct nft_ctx ctx = {
3085                 .net    = net,
3086                 .family = table->family,
3087         };
3088         int err;
3089
3090         list_for_each_entry(chain, &table->chains, list) {
3091                 if (!nft_is_base_chain(chain))
3092                         continue;
3093
3094                 ctx.chain = chain;
3095                 err = nft_chain_validate(&ctx, chain);
3096                 if (err < 0)
3097                         return err;
3098         }
3099
3100         return 0;
3101 }
3102
3103 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3104                                              const struct nlattr *nla);
3105
3106 #define NFT_RULE_MAXEXPRS       128
3107
3108 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
3109                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3110                              const struct nlattr * const nla[],
3111                              struct netlink_ext_ack *extack)
3112 {
3113         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3114         u8 genmask = nft_genmask_next(net);
3115         struct nft_expr_info *info = NULL;
3116         int family = nfmsg->nfgen_family;
3117         struct nft_flow_rule *flow;
3118         struct nft_table *table;
3119         struct nft_chain *chain;
3120         struct nft_rule *rule, *old_rule = NULL;
3121         struct nft_userdata *udata;
3122         struct nft_trans *trans = NULL;
3123         struct nft_expr *expr;
3124         struct nft_ctx ctx;
3125         struct nlattr *tmp;
3126         unsigned int size, i, n, ulen = 0, usize = 0;
3127         int err, rem;
3128         u64 handle, pos_handle;
3129
3130         lockdep_assert_held(&net->nft.commit_mutex);
3131
3132         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3133         if (IS_ERR(table)) {
3134                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3135                 return PTR_ERR(table);
3136         }
3137
3138         if (nla[NFTA_RULE_CHAIN]) {
3139                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3140                                          genmask);
3141                 if (IS_ERR(chain)) {
3142                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3143                         return PTR_ERR(chain);
3144                 }
3145                 if (nft_chain_is_bound(chain))
3146                         return -EOPNOTSUPP;
3147
3148         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3149                 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3150                 if (IS_ERR(chain)) {
3151                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3152                         return PTR_ERR(chain);
3153                 }
3154         } else {
3155                 return -EINVAL;
3156         }
3157
3158         if (nla[NFTA_RULE_HANDLE]) {
3159                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3160                 rule = __nft_rule_lookup(chain, handle);
3161                 if (IS_ERR(rule)) {
3162                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3163                         return PTR_ERR(rule);
3164                 }
3165
3166                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3167                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3168                         return -EEXIST;
3169                 }
3170                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3171                         old_rule = rule;
3172                 else
3173                         return -EOPNOTSUPP;
3174         } else {
3175                 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
3176                     nlh->nlmsg_flags & NLM_F_REPLACE)
3177                         return -EINVAL;
3178                 handle = nf_tables_alloc_handle(table);
3179
3180                 if (chain->use == UINT_MAX)
3181                         return -EOVERFLOW;
3182
3183                 if (nla[NFTA_RULE_POSITION]) {
3184                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3185                         old_rule = __nft_rule_lookup(chain, pos_handle);
3186                         if (IS_ERR(old_rule)) {
3187                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3188                                 return PTR_ERR(old_rule);
3189                         }
3190                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3191                         old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3192                         if (IS_ERR(old_rule)) {
3193                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3194                                 return PTR_ERR(old_rule);
3195                         }
3196                 }
3197         }
3198
3199         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3200
3201         n = 0;
3202         size = 0;
3203         if (nla[NFTA_RULE_EXPRESSIONS]) {
3204                 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3205                                       sizeof(struct nft_expr_info),
3206                                       GFP_KERNEL);
3207                 if (!info)
3208                         return -ENOMEM;
3209
3210                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3211                         err = -EINVAL;
3212                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3213                                 goto err1;
3214                         if (n == NFT_RULE_MAXEXPRS)
3215                                 goto err1;
3216                         err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
3217                         if (err < 0)
3218                                 goto err1;
3219                         size += info[n].ops->size;
3220                         n++;
3221                 }
3222         }
3223         /* Check for overflow of dlen field */
3224         err = -EFBIG;
3225         if (size >= 1 << 12)
3226                 goto err1;
3227
3228         if (nla[NFTA_RULE_USERDATA]) {
3229                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3230                 if (ulen > 0)
3231                         usize = sizeof(struct nft_userdata) + ulen;
3232         }
3233
3234         err = -ENOMEM;
3235         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3236         if (rule == NULL)
3237                 goto err1;
3238
3239         nft_activate_next(net, rule);
3240
3241         rule->handle = handle;
3242         rule->dlen   = size;
3243         rule->udata  = ulen ? 1 : 0;
3244
3245         if (ulen) {
3246                 udata = nft_userdata(rule);
3247                 udata->len = ulen - 1;
3248                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3249         }
3250
3251         expr = nft_expr_first(rule);
3252         for (i = 0; i < n; i++) {
3253                 err = nf_tables_newexpr(&ctx, &info[i], expr);
3254                 if (err < 0) {
3255                         NL_SET_BAD_ATTR(extack, info[i].attr);
3256                         goto err2;
3257                 }
3258
3259                 if (info[i].ops->validate)
3260                         nft_validate_state_update(net, NFT_VALIDATE_NEED);
3261
3262                 info[i].ops = NULL;
3263                 expr = nft_expr_next(expr);
3264         }
3265
3266         if (nlh->nlmsg_flags & NLM_F_REPLACE) {
3267                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3268                 if (trans == NULL) {
3269                         err = -ENOMEM;
3270                         goto err2;
3271                 }
3272                 err = nft_delrule(&ctx, old_rule);
3273                 if (err < 0) {
3274                         nft_trans_destroy(trans);
3275                         goto err2;
3276                 }
3277
3278                 list_add_tail_rcu(&rule->list, &old_rule->list);
3279         } else {
3280                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3281                 if (!trans) {
3282                         err = -ENOMEM;
3283                         goto err2;
3284                 }
3285
3286                 if (nlh->nlmsg_flags & NLM_F_APPEND) {
3287                         if (old_rule)
3288                                 list_add_rcu(&rule->list, &old_rule->list);
3289                         else
3290                                 list_add_tail_rcu(&rule->list, &chain->rules);
3291                  } else {
3292                         if (old_rule)
3293                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3294                         else
3295                                 list_add_rcu(&rule->list, &chain->rules);
3296                 }
3297         }
3298         kvfree(info);
3299         chain->use++;
3300
3301         if (net->nft.validate_state == NFT_VALIDATE_DO)
3302                 return nft_table_validate(net, table);
3303
3304         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3305                 flow = nft_flow_rule_create(net, rule);
3306                 if (IS_ERR(flow))
3307                         return PTR_ERR(flow);
3308
3309                 nft_trans_flow_rule(trans) = flow;
3310         }
3311
3312         return 0;
3313 err2:
3314         nf_tables_rule_release(&ctx, rule);
3315 err1:
3316         for (i = 0; i < n; i++) {
3317                 if (info[i].ops) {
3318                         module_put(info[i].ops->type->owner);
3319                         if (info[i].ops->type->release_ops)
3320                                 info[i].ops->type->release_ops(info[i].ops);
3321                 }
3322         }
3323         kvfree(info);
3324         return err;
3325 }
3326
3327 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3328                                              const struct nlattr *nla)
3329 {
3330         u32 id = ntohl(nla_get_be32(nla));
3331         struct nft_trans *trans;
3332
3333         list_for_each_entry(trans, &net->nft.commit_list, list) {
3334                 struct nft_rule *rule = nft_trans_rule(trans);
3335
3336                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3337                     id == nft_trans_rule_id(trans))
3338                         return rule;
3339         }
3340         return ERR_PTR(-ENOENT);
3341 }
3342
3343 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
3344                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3345                              const struct nlattr * const nla[],
3346                              struct netlink_ext_ack *extack)
3347 {
3348         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3349         u8 genmask = nft_genmask_next(net);
3350         struct nft_table *table;
3351         struct nft_chain *chain = NULL;
3352         struct nft_rule *rule;
3353         int family = nfmsg->nfgen_family, err = 0;
3354         struct nft_ctx ctx;
3355
3356         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3357         if (IS_ERR(table)) {
3358                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3359                 return PTR_ERR(table);
3360         }
3361
3362         if (nla[NFTA_RULE_CHAIN]) {
3363                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3364                                          genmask);
3365                 if (IS_ERR(chain)) {
3366                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3367                         return PTR_ERR(chain);
3368                 }
3369                 if (nft_chain_is_bound(chain))
3370                         return -EOPNOTSUPP;
3371         }
3372
3373         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3374
3375         if (chain) {
3376                 if (nla[NFTA_RULE_HANDLE]) {
3377                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3378                         if (IS_ERR(rule)) {
3379                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3380                                 return PTR_ERR(rule);
3381                         }
3382
3383                         err = nft_delrule(&ctx, rule);
3384                 } else if (nla[NFTA_RULE_ID]) {
3385                         rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3386                         if (IS_ERR(rule)) {
3387                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3388                                 return PTR_ERR(rule);
3389                         }
3390
3391                         err = nft_delrule(&ctx, rule);
3392                 } else {
3393                         err = nft_delrule_by_chain(&ctx);
3394                 }
3395         } else {
3396                 list_for_each_entry(chain, &table->chains, list) {
3397                         if (!nft_is_active_next(net, chain))
3398                                 continue;
3399
3400                         ctx.chain = chain;
3401                         err = nft_delrule_by_chain(&ctx);
3402                         if (err < 0)
3403                                 break;
3404                 }
3405         }
3406
3407         return err;
3408 }
3409
3410 /*
3411  * Sets
3412  */
3413 static const struct nft_set_type *nft_set_types[] = {
3414         &nft_set_hash_fast_type,
3415         &nft_set_hash_type,
3416         &nft_set_rhash_type,
3417         &nft_set_bitmap_type,
3418         &nft_set_rbtree_type,
3419 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3420         &nft_set_pipapo_avx2_type,
3421 #endif
3422         &nft_set_pipapo_type,
3423 };
3424
3425 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3426                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3427                                  NFT_SET_EVAL)
3428
3429 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3430 {
3431         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3432 }
3433
3434 /*
3435  * Select a set implementation based on the data characteristics and the
3436  * given policy. The total memory use might not be known if no size is
3437  * given, in that case the amount of memory per element is used.
3438  */
3439 static const struct nft_set_ops *
3440 nft_select_set_ops(const struct nft_ctx *ctx,
3441                    const struct nlattr * const nla[],
3442                    const struct nft_set_desc *desc,
3443                    enum nft_set_policies policy)
3444 {
3445         const struct nft_set_ops *ops, *bops;
3446         struct nft_set_estimate est, best;
3447         const struct nft_set_type *type;
3448         u32 flags = 0;
3449         int i;
3450
3451         lockdep_assert_held(&ctx->net->nft.commit_mutex);
3452         lockdep_nfnl_nft_mutex_not_held();
3453
3454         if (nla[NFTA_SET_FLAGS] != NULL)
3455                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3456
3457         bops        = NULL;
3458         best.size   = ~0;
3459         best.lookup = ~0;
3460         best.space  = ~0;
3461
3462         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3463                 type = nft_set_types[i];
3464                 ops = &type->ops;
3465
3466                 if (!nft_set_ops_candidate(type, flags))
3467                         continue;
3468                 if (!ops->estimate(desc, flags, &est))
3469                         continue;
3470
3471                 switch (policy) {
3472                 case NFT_SET_POL_PERFORMANCE:
3473                         if (est.lookup < best.lookup)
3474                                 break;
3475                         if (est.lookup == best.lookup &&
3476                             est.space < best.space)
3477                                 break;
3478                         continue;
3479                 case NFT_SET_POL_MEMORY:
3480                         if (!desc->size) {
3481                                 if (est.space < best.space)
3482                                         break;
3483                                 if (est.space == best.space &&
3484                                     est.lookup < best.lookup)
3485                                         break;
3486                         } else if (est.size < best.size || !bops) {
3487                                 break;
3488                         }
3489                         continue;
3490                 default:
3491                         break;
3492                 }
3493
3494                 bops = ops;
3495                 best = est;
3496         }
3497
3498         if (bops != NULL)
3499                 return bops;
3500
3501         return ERR_PTR(-EOPNOTSUPP);
3502 }
3503
3504 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3505         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3506                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3507         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3508                                             .len = NFT_SET_MAXNAMELEN - 1 },
3509         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3510         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3511         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3512         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3513         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3514         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3515         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3516         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3517         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3518         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3519         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3520                                             .len  = NFT_USERDATA_MAXLEN },
3521         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3522         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3523         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3524 };
3525
3526 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3527         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3528         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3529 };
3530
3531 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
3532                                      const struct sk_buff *skb,
3533                                      const struct nlmsghdr *nlh,
3534                                      const struct nlattr * const nla[],
3535                                      struct netlink_ext_ack *extack,
3536                                      u8 genmask)
3537 {
3538         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3539         int family = nfmsg->nfgen_family;
3540         struct nft_table *table = NULL;
3541
3542         if (nla[NFTA_SET_TABLE] != NULL) {
3543                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3544                                          genmask);
3545                 if (IS_ERR(table)) {
3546                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3547                         return PTR_ERR(table);
3548                 }
3549         }
3550
3551         nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3552         return 0;
3553 }
3554
3555 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3556                                       const struct nlattr *nla, u8 genmask)
3557 {
3558         struct nft_set *set;
3559
3560         if (nla == NULL)
3561                 return ERR_PTR(-EINVAL);
3562
3563         list_for_each_entry_rcu(set, &table->sets, list) {
3564                 if (!nla_strcmp(nla, set->name) &&
3565                     nft_active_genmask(set, genmask))
3566                         return set;
3567         }
3568         return ERR_PTR(-ENOENT);
3569 }
3570
3571 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3572                                                const struct nlattr *nla,
3573                                                u8 genmask)
3574 {
3575         struct nft_set *set;
3576
3577         list_for_each_entry(set, &table->sets, list) {
3578                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3579                     nft_active_genmask(set, genmask))
3580                         return set;
3581         }
3582         return ERR_PTR(-ENOENT);
3583 }
3584
3585 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3586                                            const struct nlattr *nla, u8 genmask)
3587 {
3588         struct nft_trans *trans;
3589         u32 id = ntohl(nla_get_be32(nla));
3590
3591         list_for_each_entry(trans, &net->nft.commit_list, list) {
3592                 if (trans->msg_type == NFT_MSG_NEWSET) {
3593                         struct nft_set *set = nft_trans_set(trans);
3594
3595                         if (id == nft_trans_set_id(trans) &&
3596                             nft_active_genmask(set, genmask))
3597                                 return set;
3598                 }
3599         }
3600         return ERR_PTR(-ENOENT);
3601 }
3602
3603 struct nft_set *nft_set_lookup_global(const struct net *net,
3604                                       const struct nft_table *table,
3605                                       const struct nlattr *nla_set_name,
3606                                       const struct nlattr *nla_set_id,
3607                                       u8 genmask)
3608 {
3609         struct nft_set *set;
3610
3611         set = nft_set_lookup(table, nla_set_name, genmask);
3612         if (IS_ERR(set)) {
3613                 if (!nla_set_id)
3614                         return set;
3615
3616                 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3617         }
3618         return set;
3619 }
3620 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3621
3622 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3623                                     const char *name)
3624 {
3625         const struct nft_set *i;
3626         const char *p;
3627         unsigned long *inuse;
3628         unsigned int n = 0, min = 0;
3629
3630         p = strchr(name, '%');
3631         if (p != NULL) {
3632                 if (p[1] != 'd' || strchr(p + 2, '%'))
3633                         return -EINVAL;
3634
3635                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3636                 if (inuse == NULL)
3637                         return -ENOMEM;
3638 cont:
3639                 list_for_each_entry(i, &ctx->table->sets, list) {
3640                         int tmp;
3641
3642                         if (!nft_is_active_next(ctx->net, set))
3643                                 continue;
3644                         if (!sscanf(i->name, name, &tmp))
3645                                 continue;
3646                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3647                                 continue;
3648
3649                         set_bit(tmp - min, inuse);
3650                 }
3651
3652                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3653                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3654                         min += BITS_PER_BYTE * PAGE_SIZE;
3655                         memset(inuse, 0, PAGE_SIZE);
3656                         goto cont;
3657                 }
3658                 free_page((unsigned long)inuse);
3659         }
3660
3661         set->name = kasprintf(GFP_KERNEL, name, min + n);
3662         if (!set->name)
3663                 return -ENOMEM;
3664
3665         list_for_each_entry(i, &ctx->table->sets, list) {
3666                 if (!nft_is_active_next(ctx->net, i))
3667                         continue;
3668                 if (!strcmp(set->name, i->name)) {
3669                         kfree(set->name);
3670                         set->name = NULL;
3671                         return -ENFILE;
3672                 }
3673         }
3674         return 0;
3675 }
3676
3677 static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3678 {
3679         u64 ms = be64_to_cpu(nla_get_be64(nla));
3680         u64 max = (u64)(~((u64)0));
3681
3682         max = div_u64(max, NSEC_PER_MSEC);
3683         if (ms >= max)
3684                 return -ERANGE;
3685
3686         ms *= NSEC_PER_MSEC;
3687         *result = nsecs_to_jiffies64(ms);
3688         return 0;
3689 }
3690
3691 static __be64 nf_jiffies64_to_msecs(u64 input)
3692 {
3693         return cpu_to_be64(jiffies64_to_msecs(input));
3694 }
3695
3696 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3697                                      const struct nft_set *set)
3698 {
3699         struct nlattr *concat, *field;
3700         int i;
3701
3702         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3703         if (!concat)
3704                 return -ENOMEM;
3705
3706         for (i = 0; i < set->field_count; i++) {
3707                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3708                 if (!field)
3709                         return -ENOMEM;
3710
3711                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3712                                  htonl(set->field_len[i])))
3713                         return -ENOMEM;
3714
3715                 nla_nest_end(skb, field);
3716         }
3717
3718         nla_nest_end(skb, concat);
3719
3720         return 0;
3721 }
3722
3723 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3724                               const struct nft_set *set, u16 event, u16 flags)
3725 {
3726         struct nfgenmsg *nfmsg;
3727         struct nlmsghdr *nlh;
3728         u32 portid = ctx->portid;
3729         struct nlattr *nest;
3730         u32 seq = ctx->seq;
3731
3732         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3733         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3734                         flags);
3735         if (nlh == NULL)
3736                 goto nla_put_failure;
3737
3738         nfmsg = nlmsg_data(nlh);
3739         nfmsg->nfgen_family     = ctx->family;
3740         nfmsg->version          = NFNETLINK_V0;
3741         nfmsg->res_id           = htons(ctx->net->nft.base_seq & 0xffff);
3742
3743         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3744                 goto nla_put_failure;
3745         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3746                 goto nla_put_failure;
3747         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3748                          NFTA_SET_PAD))
3749                 goto nla_put_failure;
3750         if (set->flags != 0)
3751                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3752                         goto nla_put_failure;
3753
3754         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3755                 goto nla_put_failure;
3756         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3757                 goto nla_put_failure;
3758         if (set->flags & NFT_SET_MAP) {
3759                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3760                         goto nla_put_failure;
3761                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3762                         goto nla_put_failure;
3763         }
3764         if (set->flags & NFT_SET_OBJECT &&
3765             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3766                 goto nla_put_failure;
3767
3768         if (set->timeout &&
3769             nla_put_be64(skb, NFTA_SET_TIMEOUT,
3770                          nf_jiffies64_to_msecs(set->timeout),
3771                          NFTA_SET_PAD))
3772                 goto nla_put_failure;
3773         if (set->gc_int &&
3774             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3775                 goto nla_put_failure;
3776
3777         if (set->policy != NFT_SET_POL_PERFORMANCE) {
3778                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3779                         goto nla_put_failure;
3780         }
3781
3782         if (set->udata &&
3783             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3784                 goto nla_put_failure;
3785
3786         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3787         if (!nest)
3788                 goto nla_put_failure;
3789         if (set->size &&
3790             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3791                 goto nla_put_failure;
3792
3793         if (set->field_count > 1 &&
3794             nf_tables_fill_set_concat(skb, set))
3795                 goto nla_put_failure;
3796
3797         nla_nest_end(skb, nest);
3798
3799         if (set->expr) {
3800                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3801                 if (nf_tables_fill_expr_info(skb, set->expr) < 0)
3802                         goto nla_put_failure;
3803
3804                 nla_nest_end(skb, nest);
3805         }
3806
3807         nlmsg_end(skb, nlh);
3808         return 0;
3809
3810 nla_put_failure:
3811         nlmsg_trim(skb, nlh);
3812         return -1;
3813 }
3814
3815 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3816                                  const struct nft_set *set, int event,
3817                                  gfp_t gfp_flags)
3818 {
3819         struct sk_buff *skb;
3820         u32 portid = ctx->portid;
3821         int err;
3822         char *buf = kasprintf(gfp_flags, "%s:%llu;%s:%llu",
3823                               ctx->table->name, ctx->table->handle,
3824                               set->name, set->handle);
3825
3826         audit_log_nfcfg(buf,
3827                         ctx->family,
3828                         set->field_count,
3829                         event == NFT_MSG_NEWSET ?
3830                                 AUDIT_NFT_OP_SET_REGISTER :
3831                                 AUDIT_NFT_OP_SET_UNREGISTER,
3832                         gfp_flags);
3833         kfree(buf);
3834
3835         if (!ctx->report &&
3836             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3837                 return;
3838
3839         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3840         if (skb == NULL)
3841                 goto err;
3842
3843         err = nf_tables_fill_set(skb, ctx, set, event, 0);
3844         if (err < 0) {
3845                 kfree_skb(skb);
3846                 goto err;
3847         }
3848
3849         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
3850         return;
3851 err:
3852         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3853 }
3854
3855 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3856 {
3857         const struct nft_set *set;
3858         unsigned int idx, s_idx = cb->args[0];
3859         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3860         struct net *net = sock_net(skb->sk);
3861         struct nft_ctx *ctx = cb->data, ctx_set;
3862
3863         if (cb->args[1])
3864                 return skb->len;
3865
3866         rcu_read_lock();
3867         cb->seq = net->nft.base_seq;
3868
3869         list_for_each_entry_rcu(table, &net->nft.tables, list) {
3870                 if (ctx->family != NFPROTO_UNSPEC &&
3871                     ctx->family != table->family)
3872                         continue;
3873
3874                 if (ctx->table && ctx->table != table)
3875                         continue;
3876
3877                 if (cur_table) {
3878                         if (cur_table != table)
3879                                 continue;
3880
3881                         cur_table = NULL;
3882                 }
3883                 idx = 0;
3884                 list_for_each_entry_rcu(set, &table->sets, list) {
3885                         if (idx < s_idx)
3886                                 goto cont;
3887                         if (!nft_is_active(net, set))
3888                                 goto cont;
3889
3890                         ctx_set = *ctx;
3891                         ctx_set.table = table;
3892                         ctx_set.family = table->family;
3893
3894                         if (nf_tables_fill_set(skb, &ctx_set, set,
3895                                                NFT_MSG_NEWSET,
3896                                                NLM_F_MULTI) < 0) {
3897                                 cb->args[0] = idx;
3898                                 cb->args[2] = (unsigned long) table;
3899                                 goto done;
3900                         }
3901                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3902 cont:
3903                         idx++;
3904                 }
3905                 if (s_idx)
3906                         s_idx = 0;
3907         }
3908         cb->args[1] = 1;
3909 done:
3910         rcu_read_unlock();
3911         return skb->len;
3912 }
3913
3914 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3915 {
3916         struct nft_ctx *ctx_dump = NULL;
3917
3918         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3919         if (ctx_dump == NULL)
3920                 return -ENOMEM;
3921
3922         cb->data = ctx_dump;
3923         return 0;
3924 }
3925
3926 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3927 {
3928         kfree(cb->data);
3929         return 0;
3930 }
3931
3932 /* called with rcu_read_lock held */
3933 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3934                             struct sk_buff *skb, const struct nlmsghdr *nlh,
3935                             const struct nlattr * const nla[],
3936                             struct netlink_ext_ack *extack)
3937 {
3938         u8 genmask = nft_genmask_cur(net);
3939         const struct nft_set *set;
3940         struct nft_ctx ctx;
3941         struct sk_buff *skb2;
3942         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3943         int err;
3944
3945         /* Verify existence before starting dump */
3946         err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3947                                         genmask);
3948         if (err < 0)
3949                 return err;
3950
3951         if (nlh->nlmsg_flags & NLM_F_DUMP) {
3952                 struct netlink_dump_control c = {
3953                         .start = nf_tables_dump_sets_start,
3954                         .dump = nf_tables_dump_sets,
3955                         .done = nf_tables_dump_sets_done,
3956                         .data = &ctx,
3957                         .module = THIS_MODULE,
3958                 };
3959
3960                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3961         }
3962
3963         /* Only accept unspec with dump */
3964         if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3965                 return -EAFNOSUPPORT;
3966         if (!nla[NFTA_SET_TABLE])
3967                 return -EINVAL;
3968
3969         set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3970         if (IS_ERR(set))
3971                 return PTR_ERR(set);
3972
3973         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3974         if (skb2 == NULL)
3975                 return -ENOMEM;
3976
3977         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3978         if (err < 0)
3979                 goto err_fill_set_info;
3980
3981         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3982
3983 err_fill_set_info:
3984         kfree_skb(skb2);
3985         return err;
3986 }
3987
3988 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
3989         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
3990 };
3991
3992 static int nft_set_desc_concat_parse(const struct nlattr *attr,
3993                                      struct nft_set_desc *desc)
3994 {
3995         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
3996         u32 len;
3997         int err;
3998
3999         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4000                                           nft_concat_policy, NULL);
4001         if (err < 0)
4002                 return err;
4003
4004         if (!tb[NFTA_SET_FIELD_LEN])
4005                 return -EINVAL;
4006
4007         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4008
4009         if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
4010                 return -E2BIG;
4011
4012         desc->field_len[desc->field_count++] = len;
4013
4014         return 0;
4015 }
4016
4017 static int nft_set_desc_concat(struct nft_set_desc *desc,
4018                                const struct nlattr *nla)
4019 {
4020         struct nlattr *attr;
4021         int rem, err;
4022
4023         nla_for_each_nested(attr, nla, rem) {
4024                 if (nla_type(attr) != NFTA_LIST_ELEM)
4025                         return -EINVAL;
4026
4027                 err = nft_set_desc_concat_parse(attr, desc);
4028                 if (err < 0)
4029                         return err;
4030         }
4031
4032         return 0;
4033 }
4034
4035 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4036                                     const struct nlattr *nla)
4037 {
4038         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4039         int err;
4040
4041         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4042                                           nft_set_desc_policy, NULL);
4043         if (err < 0)
4044                 return err;
4045
4046         if (da[NFTA_SET_DESC_SIZE] != NULL)
4047                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4048         if (da[NFTA_SET_DESC_CONCAT])
4049                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4050
4051         return err;
4052 }
4053
4054 static int nf_tables_newset(struct net *net, struct sock *nlsk,
4055                             struct sk_buff *skb, const struct nlmsghdr *nlh,
4056                             const struct nlattr * const nla[],
4057                             struct netlink_ext_ack *extack)
4058 {
4059         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4060         u8 genmask = nft_genmask_next(net);
4061         int family = nfmsg->nfgen_family;
4062         const struct nft_set_ops *ops;
4063         struct nft_expr *expr = NULL;
4064         struct nft_table *table;
4065         struct nft_set *set;
4066         struct nft_ctx ctx;
4067         char *name;
4068         u64 size;
4069         u64 timeout;
4070         u32 ktype, dtype, flags, policy, gc_int, objtype;
4071         struct nft_set_desc desc;
4072         unsigned char *udata;
4073         u16 udlen;
4074         int err;
4075         int i;
4076
4077         if (nla[NFTA_SET_TABLE] == NULL ||
4078             nla[NFTA_SET_NAME] == NULL ||
4079             nla[NFTA_SET_KEY_LEN] == NULL ||
4080             nla[NFTA_SET_ID] == NULL)
4081                 return -EINVAL;
4082
4083         memset(&desc, 0, sizeof(desc));
4084
4085         ktype = NFT_DATA_VALUE;
4086         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4087                 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4088                 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4089                         return -EINVAL;
4090         }
4091
4092         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4093         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4094                 return -EINVAL;
4095
4096         flags = 0;
4097         if (nla[NFTA_SET_FLAGS] != NULL) {
4098                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4099                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4100                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4101                               NFT_SET_MAP | NFT_SET_EVAL |
4102                               NFT_SET_OBJECT | NFT_SET_CONCAT))
4103                         return -EOPNOTSUPP;
4104                 /* Only one of these operations is supported */
4105                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4106                              (NFT_SET_MAP | NFT_SET_OBJECT))
4107                         return -EOPNOTSUPP;
4108                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4109                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4110                         return -EOPNOTSUPP;
4111         }
4112
4113         dtype = 0;
4114         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4115                 if (!(flags & NFT_SET_MAP))
4116                         return -EINVAL;
4117
4118                 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4119                 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4120                     dtype != NFT_DATA_VERDICT)
4121                         return -EINVAL;
4122
4123                 if (dtype != NFT_DATA_VERDICT) {
4124                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4125                                 return -EINVAL;
4126                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4127                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4128                                 return -EINVAL;
4129                 } else
4130                         desc.dlen = sizeof(struct nft_verdict);
4131         } else if (flags & NFT_SET_MAP)
4132                 return -EINVAL;
4133
4134         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4135                 if (!(flags & NFT_SET_OBJECT))
4136                         return -EINVAL;
4137
4138                 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4139                 if (objtype == NFT_OBJECT_UNSPEC ||
4140                     objtype > NFT_OBJECT_MAX)
4141                         return -EOPNOTSUPP;
4142         } else if (flags & NFT_SET_OBJECT)
4143                 return -EINVAL;
4144         else
4145                 objtype = NFT_OBJECT_UNSPEC;
4146
4147         timeout = 0;
4148         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4149                 if (!(flags & NFT_SET_TIMEOUT))
4150                         return -EINVAL;
4151
4152                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4153                 if (err)
4154                         return err;
4155         }
4156         gc_int = 0;
4157         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4158                 if (!(flags & NFT_SET_TIMEOUT))
4159                         return -EINVAL;
4160                 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4161         }
4162
4163         policy = NFT_SET_POL_PERFORMANCE;
4164         if (nla[NFTA_SET_POLICY] != NULL)
4165                 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4166
4167         if (nla[NFTA_SET_DESC] != NULL) {
4168                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4169                 if (err < 0)
4170                         return err;
4171         }
4172
4173         if (nla[NFTA_SET_EXPR])
4174                 desc.expr = true;
4175
4176         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
4177         if (IS_ERR(table)) {
4178                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4179                 return PTR_ERR(table);
4180         }
4181
4182         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
4183
4184         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4185         if (IS_ERR(set)) {
4186                 if (PTR_ERR(set) != -ENOENT) {
4187                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4188                         return PTR_ERR(set);
4189                 }
4190         } else {
4191                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
4192                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4193                         return -EEXIST;
4194                 }
4195                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
4196                         return -EOPNOTSUPP;
4197
4198                 return 0;
4199         }
4200
4201         if (!(nlh->nlmsg_flags & NLM_F_CREATE))
4202                 return -ENOENT;
4203
4204         ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4205         if (IS_ERR(ops))
4206                 return PTR_ERR(ops);
4207
4208         udlen = 0;
4209         if (nla[NFTA_SET_USERDATA])
4210                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4211
4212         size = 0;
4213         if (ops->privsize != NULL)
4214                 size = ops->privsize(nla, &desc);
4215
4216         set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
4217         if (!set)
4218                 return -ENOMEM;
4219
4220         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4221         if (!name) {
4222                 err = -ENOMEM;
4223                 goto err_set_name;
4224         }
4225
4226         err = nf_tables_set_alloc_name(&ctx, set, name);
4227         kfree(name);
4228         if (err < 0)
4229                 goto err_set_alloc_name;
4230
4231         if (nla[NFTA_SET_EXPR]) {
4232                 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4233                 if (IS_ERR(expr)) {
4234                         err = PTR_ERR(expr);
4235                         goto err_set_alloc_name;
4236                 }
4237         }
4238
4239         udata = NULL;
4240         if (udlen) {
4241                 udata = set->data + size;
4242                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4243         }
4244
4245         INIT_LIST_HEAD(&set->bindings);
4246         set->table = table;
4247         write_pnet(&set->net, net);
4248         set->ops   = ops;
4249         set->ktype = ktype;
4250         set->klen  = desc.klen;
4251         set->dtype = dtype;
4252         set->objtype = objtype;
4253         set->dlen  = desc.dlen;
4254         set->expr = expr;
4255         set->flags = flags;
4256         set->size  = desc.size;
4257         set->policy = policy;
4258         set->udlen  = udlen;
4259         set->udata  = udata;
4260         set->timeout = timeout;
4261         set->gc_int = gc_int;
4262         set->handle = nf_tables_alloc_handle(table);
4263
4264         set->field_count = desc.field_count;
4265         for (i = 0; i < desc.field_count; i++)
4266                 set->field_len[i] = desc.field_len[i];
4267
4268         err = ops->init(set, &desc, nla);
4269         if (err < 0)
4270                 goto err_set_init;
4271
4272         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4273         if (err < 0)
4274                 goto err_set_trans;
4275
4276         list_add_tail_rcu(&set->list, &table->sets);
4277         table->use++;
4278         return 0;
4279
4280 err_set_trans:
4281         ops->destroy(set);
4282 err_set_init:
4283         if (expr)
4284                 nft_expr_destroy(&ctx, expr);
4285 err_set_alloc_name:
4286         kfree(set->name);
4287 err_set_name:
4288         kvfree(set);
4289         return err;
4290 }
4291
4292 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4293 {
4294         if (WARN_ON(set->use > 0))
4295                 return;
4296
4297         if (set->expr)
4298                 nft_expr_destroy(ctx, set->expr);
4299
4300         set->ops->destroy(set);
4301         kfree(set->name);
4302         kvfree(set);
4303 }
4304
4305 static int nf_tables_delset(struct net *net, struct sock *nlsk,
4306                             struct sk_buff *skb, const struct nlmsghdr *nlh,
4307                             const struct nlattr * const nla[],
4308                             struct netlink_ext_ack *extack)
4309 {
4310         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4311         u8 genmask = nft_genmask_next(net);
4312         const struct nlattr *attr;
4313         struct nft_set *set;
4314         struct nft_ctx ctx;
4315         int err;
4316
4317         if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4318                 return -EAFNOSUPPORT;
4319         if (nla[NFTA_SET_TABLE] == NULL)
4320                 return -EINVAL;
4321
4322         err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
4323                                         genmask);
4324         if (err < 0)
4325                 return err;
4326
4327         if (nla[NFTA_SET_HANDLE]) {
4328                 attr = nla[NFTA_SET_HANDLE];
4329                 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
4330         } else {
4331                 attr = nla[NFTA_SET_NAME];
4332                 set = nft_set_lookup(ctx.table, attr, genmask);
4333         }
4334
4335         if (IS_ERR(set)) {
4336                 NL_SET_BAD_ATTR(extack, attr);
4337                 return PTR_ERR(set);
4338         }
4339         if (set->use ||
4340             (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
4341                 NL_SET_BAD_ATTR(extack, attr);
4342                 return -EBUSY;
4343         }
4344
4345         return nft_delset(&ctx, set);
4346 }
4347
4348 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4349                                         struct nft_set *set,
4350                                         const struct nft_set_iter *iter,
4351                                         struct nft_set_elem *elem)
4352 {
4353         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4354         enum nft_registers dreg;
4355
4356         dreg = nft_type_to_reg(set->dtype);
4357         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4358                                            set->dtype == NFT_DATA_VERDICT ?
4359                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4360                                            set->dlen);
4361 }
4362
4363 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4364                        struct nft_set_binding *binding)
4365 {
4366         struct nft_set_binding *i;
4367         struct nft_set_iter iter;
4368
4369         if (set->use == UINT_MAX)
4370                 return -EOVERFLOW;
4371
4372         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4373                 return -EBUSY;
4374
4375         if (binding->flags & NFT_SET_MAP) {
4376                 /* If the set is already bound to the same chain all
4377                  * jumps are already validated for that chain.
4378                  */
4379                 list_for_each_entry(i, &set->bindings, list) {
4380                         if (i->flags & NFT_SET_MAP &&
4381                             i->chain == binding->chain)
4382                                 goto bind;
4383                 }
4384
4385                 iter.genmask    = nft_genmask_next(ctx->net);
4386                 iter.skip       = 0;
4387                 iter.count      = 0;
4388                 iter.err        = 0;
4389                 iter.fn         = nf_tables_bind_check_setelem;
4390
4391                 set->ops->walk(ctx, set, &iter);
4392                 if (iter.err < 0)
4393                         return iter.err;
4394         }
4395 bind:
4396         binding->chain = ctx->chain;
4397         list_add_tail_rcu(&binding->list, &set->bindings);
4398         nft_set_trans_bind(ctx, set);
4399         set->use++;
4400
4401         return 0;
4402 }
4403 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4404
4405 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4406                                  struct nft_set_binding *binding, bool event)
4407 {
4408         list_del_rcu(&binding->list);
4409
4410         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4411                 list_del_rcu(&set->list);
4412                 if (event)
4413                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4414                                              GFP_KERNEL);
4415         }
4416 }
4417
4418 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4419                               struct nft_set_binding *binding,
4420                               enum nft_trans_phase phase)
4421 {
4422         switch (phase) {
4423         case NFT_TRANS_PREPARE:
4424                 set->use--;
4425                 return;
4426         case NFT_TRANS_ABORT:
4427         case NFT_TRANS_RELEASE:
4428                 set->use--;
4429                 fallthrough;
4430         default:
4431                 nf_tables_unbind_set(ctx, set, binding,
4432                                      phase == NFT_TRANS_COMMIT);
4433         }
4434 }
4435 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4436
4437 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4438 {
4439         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4440                 nft_set_destroy(ctx, set);
4441 }
4442 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4443
4444 const struct nft_set_ext_type nft_set_ext_types[] = {
4445         [NFT_SET_EXT_KEY]               = {
4446                 .align  = __alignof__(u32),
4447         },
4448         [NFT_SET_EXT_DATA]              = {
4449                 .align  = __alignof__(u32),
4450         },
4451         [NFT_SET_EXT_EXPR]              = {
4452                 .align  = __alignof__(struct nft_expr),
4453         },
4454         [NFT_SET_EXT_OBJREF]            = {
4455                 .len    = sizeof(struct nft_object *),
4456                 .align  = __alignof__(struct nft_object *),
4457         },
4458         [NFT_SET_EXT_FLAGS]             = {
4459                 .len    = sizeof(u8),
4460                 .align  = __alignof__(u8),
4461         },
4462         [NFT_SET_EXT_TIMEOUT]           = {
4463                 .len    = sizeof(u64),
4464                 .align  = __alignof__(u64),
4465         },
4466         [NFT_SET_EXT_EXPIRATION]        = {
4467                 .len    = sizeof(u64),
4468                 .align  = __alignof__(u64),
4469         },
4470         [NFT_SET_EXT_USERDATA]          = {
4471                 .len    = sizeof(struct nft_userdata),
4472                 .align  = __alignof__(struct nft_userdata),
4473         },
4474         [NFT_SET_EXT_KEY_END]           = {
4475                 .align  = __alignof__(u32),
4476         },
4477 };
4478
4479 /*
4480  * Set elements
4481  */
4482
4483 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4484         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
4485         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
4486         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
4487         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
4488         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
4489         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
4490                                             .len = NFT_USERDATA_MAXLEN },
4491         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
4492         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
4493                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
4494         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
4495 };
4496
4497 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4498         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
4499                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4500         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
4501                                             .len = NFT_SET_MAXNAMELEN - 1 },
4502         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
4503         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
4504 };
4505
4506 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
4507                                       const struct sk_buff *skb,
4508                                       const struct nlmsghdr *nlh,
4509                                       const struct nlattr * const nla[],
4510                                       struct netlink_ext_ack *extack,
4511                                       u8 genmask)
4512 {
4513         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4514         int family = nfmsg->nfgen_family;
4515         struct nft_table *table;
4516
4517         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
4518                                  genmask);
4519         if (IS_ERR(table)) {
4520                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
4521                 return PTR_ERR(table);
4522         }
4523
4524         nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
4525         return 0;
4526 }
4527
4528 static int nf_tables_fill_setelem(struct sk_buff *skb,
4529                                   const struct nft_set *set,
4530                                   const struct nft_set_elem *elem)
4531 {
4532         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4533         unsigned char *b = skb_tail_pointer(skb);
4534         struct nlattr *nest;
4535
4536         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4537         if (nest == NULL)
4538                 goto nla_put_failure;
4539
4540         if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4541                           NFT_DATA_VALUE, set->klen) < 0)
4542                 goto nla_put_failure;
4543
4544         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4545             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4546                           NFT_DATA_VALUE, set->klen) < 0)
4547                 goto nla_put_failure;
4548
4549         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4550             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4551                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4552                           set->dlen) < 0)
4553                 goto nla_put_failure;
4554
4555         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
4556             nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
4557                 goto nla_put_failure;
4558
4559         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4560             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4561                            (*nft_set_ext_obj(ext))->key.name) < 0)
4562                 goto nla_put_failure;
4563
4564         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4565             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4566                          htonl(*nft_set_ext_flags(ext))))
4567                 goto nla_put_failure;
4568
4569         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4570             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4571                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4572                          NFTA_SET_ELEM_PAD))
4573                 goto nla_put_failure;
4574
4575         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4576                 u64 expires, now = get_jiffies_64();
4577
4578                 expires = *nft_set_ext_expiration(ext);
4579                 if (time_before64(now, expires))
4580                         expires -= now;
4581                 else
4582                         expires = 0;
4583
4584                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4585                                  nf_jiffies64_to_msecs(expires),
4586                                  NFTA_SET_ELEM_PAD))
4587                         goto nla_put_failure;
4588         }
4589
4590         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4591                 struct nft_userdata *udata;
4592
4593                 udata = nft_set_ext_userdata(ext);
4594                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4595                             udata->len + 1, udata->data))
4596                         goto nla_put_failure;
4597         }
4598
4599         nla_nest_end(skb, nest);
4600         return 0;
4601
4602 nla_put_failure:
4603         nlmsg_trim(skb, b);
4604         return -EMSGSIZE;
4605 }
4606
4607 struct nft_set_dump_args {
4608         const struct netlink_callback   *cb;
4609         struct nft_set_iter             iter;
4610         struct sk_buff                  *skb;
4611 };
4612
4613 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4614                                   struct nft_set *set,
4615                                   const struct nft_set_iter *iter,
4616                                   struct nft_set_elem *elem)
4617 {
4618         struct nft_set_dump_args *args;
4619
4620         args = container_of(iter, struct nft_set_dump_args, iter);
4621         return nf_tables_fill_setelem(args->skb, set, elem);
4622 }
4623
4624 struct nft_set_dump_ctx {
4625         const struct nft_set    *set;
4626         struct nft_ctx          ctx;
4627 };
4628
4629 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4630 {
4631         struct nft_set_dump_ctx *dump_ctx = cb->data;
4632         struct net *net = sock_net(skb->sk);
4633         struct nft_table *table;
4634         struct nft_set *set;
4635         struct nft_set_dump_args args;
4636         bool set_found = false;
4637         struct nfgenmsg *nfmsg;
4638         struct nlmsghdr *nlh;
4639         struct nlattr *nest;
4640         u32 portid, seq;
4641         int event;
4642
4643         rcu_read_lock();
4644         list_for_each_entry_rcu(table, &net->nft.tables, list) {
4645                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4646                     dump_ctx->ctx.family != table->family)
4647                         continue;
4648
4649                 if (table != dump_ctx->ctx.table)
4650                         continue;
4651
4652                 list_for_each_entry_rcu(set, &table->sets, list) {
4653                         if (set == dump_ctx->set) {
4654                                 set_found = true;
4655                                 break;
4656                         }
4657                 }
4658                 break;
4659         }
4660
4661         if (!set_found) {
4662                 rcu_read_unlock();
4663                 return -ENOENT;
4664         }
4665
4666         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4667         portid = NETLINK_CB(cb->skb).portid;
4668         seq    = cb->nlh->nlmsg_seq;
4669
4670         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4671                         NLM_F_MULTI);
4672         if (nlh == NULL)
4673                 goto nla_put_failure;
4674
4675         nfmsg = nlmsg_data(nlh);
4676         nfmsg->nfgen_family = table->family;
4677         nfmsg->version      = NFNETLINK_V0;
4678         nfmsg->res_id       = htons(net->nft.base_seq & 0xffff);
4679
4680         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4681                 goto nla_put_failure;
4682         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4683                 goto nla_put_failure;
4684
4685         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4686         if (nest == NULL)
4687                 goto nla_put_failure;
4688
4689         args.cb                 = cb;
4690         args.skb                = skb;
4691         args.iter.genmask       = nft_genmask_cur(net);
4692         args.iter.skip          = cb->args[0];
4693         args.iter.count         = 0;
4694         args.iter.err           = 0;
4695         args.iter.fn            = nf_tables_dump_setelem;
4696         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4697         rcu_read_unlock();
4698
4699         nla_nest_end(skb, nest);
4700         nlmsg_end(skb, nlh);
4701
4702         if (args.iter.err && args.iter.err != -EMSGSIZE)
4703                 return args.iter.err;
4704         if (args.iter.count == cb->args[0])
4705                 return 0;
4706
4707         cb->args[0] = args.iter.count;
4708         return skb->len;
4709
4710 nla_put_failure:
4711         rcu_read_unlock();
4712         return -ENOSPC;
4713 }
4714
4715 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4716 {
4717         struct nft_set_dump_ctx *dump_ctx = cb->data;
4718
4719         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4720
4721         return cb->data ? 0 : -ENOMEM;
4722 }
4723
4724 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4725 {
4726         kfree(cb->data);
4727         return 0;
4728 }
4729
4730 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4731                                        const struct nft_ctx *ctx, u32 seq,
4732                                        u32 portid, int event, u16 flags,
4733                                        const struct nft_set *set,
4734                                        const struct nft_set_elem *elem)
4735 {
4736         struct nfgenmsg *nfmsg;
4737         struct nlmsghdr *nlh;
4738         struct nlattr *nest;
4739         int err;
4740
4741         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4742         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4743                         flags);
4744         if (nlh == NULL)
4745                 goto nla_put_failure;
4746
4747         nfmsg = nlmsg_data(nlh);
4748         nfmsg->nfgen_family     = ctx->family;
4749         nfmsg->version          = NFNETLINK_V0;
4750         nfmsg->res_id           = htons(ctx->net->nft.base_seq & 0xffff);
4751
4752         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4753                 goto nla_put_failure;
4754         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4755                 goto nla_put_failure;
4756
4757         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4758         if (nest == NULL)
4759                 goto nla_put_failure;
4760
4761         err = nf_tables_fill_setelem(skb, set, elem);
4762         if (err < 0)
4763                 goto nla_put_failure;
4764
4765         nla_nest_end(skb, nest);
4766
4767         nlmsg_end(skb, nlh);
4768         return 0;
4769
4770 nla_put_failure:
4771         nlmsg_trim(skb, nlh);
4772         return -1;
4773 }
4774
4775 static int nft_setelem_parse_flags(const struct nft_set *set,
4776                                    const struct nlattr *attr, u32 *flags)
4777 {
4778         if (attr == NULL)
4779                 return 0;
4780
4781         *flags = ntohl(nla_get_be32(attr));
4782         if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4783                 return -EINVAL;
4784         if (!(set->flags & NFT_SET_INTERVAL) &&
4785             *flags & NFT_SET_ELEM_INTERVAL_END)
4786                 return -EINVAL;
4787
4788         return 0;
4789 }
4790
4791 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
4792                                  struct nft_data *key, struct nlattr *attr)
4793 {
4794         struct nft_data_desc desc;
4795         int err;
4796
4797         err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
4798         if (err < 0)
4799                 return err;
4800
4801         if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
4802                 nft_data_release(key, desc.type);
4803                 return -EINVAL;
4804         }
4805
4806         return 0;
4807 }
4808
4809 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
4810                                   struct nft_data_desc *desc,
4811                                   struct nft_data *data,
4812                                   struct nlattr *attr)
4813 {
4814         int err;
4815
4816         err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
4817         if (err < 0)
4818                 return err;
4819
4820         if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
4821                 nft_data_release(data, desc->type);
4822                 return -EINVAL;
4823         }
4824
4825         return 0;
4826 }
4827
4828 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4829                             const struct nlattr *attr)
4830 {
4831         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4832         struct nft_set_elem elem;
4833         struct sk_buff *skb;
4834         uint32_t flags = 0;
4835         void *priv;
4836         int err;
4837
4838         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4839                                           nft_set_elem_policy, NULL);
4840         if (err < 0)
4841                 return err;
4842
4843         if (!nla[NFTA_SET_ELEM_KEY])
4844                 return -EINVAL;
4845
4846         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4847         if (err < 0)
4848                 return err;
4849
4850         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
4851                                     nla[NFTA_SET_ELEM_KEY]);
4852         if (err < 0)
4853                 return err;
4854
4855         if (nla[NFTA_SET_ELEM_KEY_END]) {
4856                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
4857                                             nla[NFTA_SET_ELEM_KEY_END]);
4858                 if (err < 0)
4859                         return err;
4860         }
4861
4862         priv = set->ops->get(ctx->net, set, &elem, flags);
4863         if (IS_ERR(priv))
4864                 return PTR_ERR(priv);
4865
4866         elem.priv = priv;
4867
4868         err = -ENOMEM;
4869         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
4870         if (skb == NULL)
4871                 return err;
4872
4873         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4874                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
4875         if (err < 0)
4876                 goto err_fill_setelem;
4877
4878         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
4879
4880 err_fill_setelem:
4881         kfree_skb(skb);
4882         return err;
4883 }
4884
4885 /* called with rcu_read_lock held */
4886 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4887                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
4888                                 const struct nlattr * const nla[],
4889                                 struct netlink_ext_ack *extack)
4890 {
4891         u8 genmask = nft_genmask_cur(net);
4892         struct nft_set *set;
4893         struct nlattr *attr;
4894         struct nft_ctx ctx;
4895         int rem, err = 0;
4896
4897         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4898                                          genmask);
4899         if (err < 0)
4900                 return err;
4901
4902         set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4903         if (IS_ERR(set))
4904                 return PTR_ERR(set);
4905
4906         if (nlh->nlmsg_flags & NLM_F_DUMP) {
4907                 struct netlink_dump_control c = {
4908                         .start = nf_tables_dump_set_start,
4909                         .dump = nf_tables_dump_set,
4910                         .done = nf_tables_dump_set_done,
4911                         .module = THIS_MODULE,
4912                 };
4913                 struct nft_set_dump_ctx dump_ctx = {
4914                         .set = set,
4915                         .ctx = ctx,
4916                 };
4917
4918                 c.data = &dump_ctx;
4919                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4920         }
4921
4922         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4923                 return -EINVAL;
4924
4925         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4926                 err = nft_get_set_elem(&ctx, set, attr);
4927                 if (err < 0)
4928                         break;
4929         }
4930
4931         return err;
4932 }
4933
4934 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4935                                      const struct nft_set *set,
4936                                      const struct nft_set_elem *elem,
4937                                      int event, u16 flags)
4938 {
4939         struct net *net = ctx->net;
4940         u32 portid = ctx->portid;
4941         struct sk_buff *skb;
4942         int err;
4943         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
4944                               ctx->table->name, ctx->table->handle,
4945                               set->name, set->handle);
4946
4947         audit_log_nfcfg(buf,
4948                         ctx->family,
4949                         set->handle,
4950                         event == NFT_MSG_NEWSETELEM ?
4951                                 AUDIT_NFT_OP_SETELEM_REGISTER :
4952                                 AUDIT_NFT_OP_SETELEM_UNREGISTER,
4953                         GFP_KERNEL);
4954         kfree(buf);
4955
4956         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4957                 return;
4958
4959         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4960         if (skb == NULL)
4961                 goto err;
4962
4963         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
4964                                           set, elem);
4965         if (err < 0) {
4966                 kfree_skb(skb);
4967                 goto err;
4968         }
4969
4970         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
4971         return;
4972 err:
4973         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4974 }
4975
4976 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
4977                                               int msg_type,
4978                                               struct nft_set *set)
4979 {
4980         struct nft_trans *trans;
4981
4982         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
4983         if (trans == NULL)
4984                 return NULL;
4985
4986         nft_trans_elem_set(trans) = set;
4987         return trans;
4988 }
4989
4990 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
4991                                          const struct nft_set *set,
4992                                          const struct nlattr *attr)
4993 {
4994         struct nft_expr *expr;
4995         int err;
4996
4997         expr = nft_expr_init(ctx, attr);
4998         if (IS_ERR(expr))
4999                 return expr;
5000
5001         err = -EOPNOTSUPP;
5002         if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL))
5003                 goto err_set_elem_expr;
5004
5005         if (expr->ops->type->flags & NFT_EXPR_GC) {
5006                 if (set->flags & NFT_SET_TIMEOUT)
5007                         goto err_set_elem_expr;
5008                 if (!set->ops->gc_init)
5009                         goto err_set_elem_expr;
5010                 set->ops->gc_init(set);
5011         }
5012
5013         return expr;
5014
5015 err_set_elem_expr:
5016         nft_expr_destroy(ctx, expr);
5017         return ERR_PTR(err);
5018 }
5019
5020 void *nft_set_elem_init(const struct nft_set *set,
5021                         const struct nft_set_ext_tmpl *tmpl,
5022                         const u32 *key, const u32 *key_end,
5023                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5024 {
5025         struct nft_set_ext *ext;
5026         void *elem;
5027
5028         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5029         if (elem == NULL)
5030                 return NULL;
5031
5032         ext = nft_set_elem_ext(set, elem);
5033         nft_set_ext_init(ext, tmpl);
5034
5035         memcpy(nft_set_ext_key(ext), key, set->klen);
5036         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5037                 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5038         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5039                 memcpy(nft_set_ext_data(ext), data, set->dlen);
5040         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5041                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5042                 if (expiration == 0)
5043                         *nft_set_ext_expiration(ext) += timeout;
5044         }
5045         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5046                 *nft_set_ext_timeout(ext) = timeout;
5047
5048         return elem;
5049 }
5050
5051 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5052                                       struct nft_expr *expr)
5053 {
5054         if (expr->ops->destroy_clone) {
5055                 expr->ops->destroy_clone(ctx, expr);
5056                 module_put(expr->ops->type->owner);
5057         } else {
5058                 nf_tables_expr_destroy(ctx, expr);
5059         }
5060 }
5061
5062 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5063                           bool destroy_expr)
5064 {
5065         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5066         struct nft_ctx ctx = {
5067                 .net    = read_pnet(&set->net),
5068                 .family = set->table->family,
5069         };
5070
5071         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5072         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5073                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5074         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
5075                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5076
5077         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5078                 (*nft_set_ext_obj(ext))->use--;
5079         kfree(elem);
5080 }
5081 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5082
5083 /* Only called from commit path, nft_set_elem_deactivate() already deals with
5084  * the refcounting from the preparation phase.
5085  */
5086 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5087                                        const struct nft_set *set, void *elem)
5088 {
5089         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5090
5091         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
5092                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5093
5094         kfree(elem);
5095 }
5096
5097 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5098                             const struct nlattr *attr, u32 nlmsg_flags)
5099 {
5100         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5101         u8 genmask = nft_genmask_next(ctx->net);
5102         struct nft_set_ext_tmpl tmpl;
5103         struct nft_set_ext *ext, *ext2;
5104         struct nft_set_elem elem;
5105         struct nft_set_binding *binding;
5106         struct nft_object *obj = NULL;
5107         struct nft_expr *expr = NULL;
5108         struct nft_userdata *udata;
5109         struct nft_data_desc desc;
5110         enum nft_registers dreg;
5111         struct nft_trans *trans;
5112         u32 flags = 0;
5113         u64 timeout;
5114         u64 expiration;
5115         u8 ulen;
5116         int err;
5117
5118         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5119                                           nft_set_elem_policy, NULL);
5120         if (err < 0)
5121                 return err;
5122
5123         if (nla[NFTA_SET_ELEM_KEY] == NULL)
5124                 return -EINVAL;
5125
5126         nft_set_ext_prepare(&tmpl);
5127
5128         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5129         if (err < 0)
5130                 return err;
5131         if (flags != 0)
5132                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5133
5134         if (set->flags & NFT_SET_MAP) {
5135                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5136                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5137                         return -EINVAL;
5138         } else {
5139                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5140                         return -EINVAL;
5141         }
5142
5143         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5144              (nla[NFTA_SET_ELEM_DATA] ||
5145               nla[NFTA_SET_ELEM_OBJREF] ||
5146               nla[NFTA_SET_ELEM_TIMEOUT] ||
5147               nla[NFTA_SET_ELEM_EXPIRATION] ||
5148               nla[NFTA_SET_ELEM_USERDATA] ||
5149               nla[NFTA_SET_ELEM_EXPR]))
5150                 return -EINVAL;
5151
5152         timeout = 0;
5153         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5154                 if (!(set->flags & NFT_SET_TIMEOUT))
5155                         return -EINVAL;
5156                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5157                                             &timeout);
5158                 if (err)
5159                         return err;
5160         } else if (set->flags & NFT_SET_TIMEOUT) {
5161                 timeout = set->timeout;
5162         }
5163
5164         expiration = 0;
5165         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5166                 if (!(set->flags & NFT_SET_TIMEOUT))
5167                         return -EINVAL;
5168                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5169                                             &expiration);
5170                 if (err)
5171                         return err;
5172         }
5173
5174         if (nla[NFTA_SET_ELEM_EXPR] != NULL) {
5175                 expr = nft_set_elem_expr_alloc(ctx, set,
5176                                                nla[NFTA_SET_ELEM_EXPR]);
5177                 if (IS_ERR(expr))
5178                         return PTR_ERR(expr);
5179
5180                 err = -EOPNOTSUPP;
5181                 if (set->expr && set->expr->ops != expr->ops)
5182                         goto err_set_elem_expr;
5183         } else if (set->expr) {
5184                 expr = kzalloc(set->expr->ops->size, GFP_KERNEL);
5185                 if (!expr)
5186                         return -ENOMEM;
5187
5188                 err = nft_expr_clone(expr, set->expr);
5189                 if (err < 0)
5190                         goto err_set_elem_expr;
5191         }
5192
5193         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5194                                     nla[NFTA_SET_ELEM_KEY]);
5195         if (err < 0)
5196                 goto err_set_elem_expr;
5197
5198         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5199
5200         if (nla[NFTA_SET_ELEM_KEY_END]) {
5201                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5202                                             nla[NFTA_SET_ELEM_KEY_END]);
5203                 if (err < 0)
5204                         goto err_parse_key;
5205
5206                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5207         }
5208
5209         if (timeout > 0) {
5210                 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5211                 if (timeout != set->timeout)
5212                         nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5213         }
5214
5215         if (expr)
5216                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPR,
5217                                        expr->ops->size);
5218
5219         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5220                 if (!(set->flags & NFT_SET_OBJECT)) {
5221                         err = -EINVAL;
5222                         goto err_parse_key_end;
5223                 }
5224                 obj = nft_obj_lookup(ctx->net, ctx->table,
5225                                      nla[NFTA_SET_ELEM_OBJREF],
5226                                      set->objtype, genmask);
5227                 if (IS_ERR(obj)) {
5228                         err = PTR_ERR(obj);
5229                         goto err_parse_key_end;
5230                 }
5231                 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5232         }
5233
5234         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5235                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5236                                              nla[NFTA_SET_ELEM_DATA]);
5237                 if (err < 0)
5238                         goto err_parse_key_end;
5239
5240                 dreg = nft_type_to_reg(set->dtype);
5241                 list_for_each_entry(binding, &set->bindings, list) {
5242                         struct nft_ctx bind_ctx = {
5243                                 .net    = ctx->net,
5244                                 .family = ctx->family,
5245                                 .table  = ctx->table,
5246                                 .chain  = (struct nft_chain *)binding->chain,
5247                         };
5248
5249                         if (!(binding->flags & NFT_SET_MAP))
5250                                 continue;
5251
5252                         err = nft_validate_register_store(&bind_ctx, dreg,
5253                                                           &elem.data.val,
5254                                                           desc.type, desc.len);
5255                         if (err < 0)
5256                                 goto err_parse_data;
5257
5258                         if (desc.type == NFT_DATA_VERDICT &&
5259                             (elem.data.val.verdict.code == NFT_GOTO ||
5260                              elem.data.val.verdict.code == NFT_JUMP))
5261                                 nft_validate_state_update(ctx->net,
5262                                                           NFT_VALIDATE_NEED);
5263                 }
5264
5265                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
5266         }
5267
5268         /* The full maximum length of userdata can exceed the maximum
5269          * offset value (U8_MAX) for following extensions, therefor it
5270          * must be the last extension added.
5271          */
5272         ulen = 0;
5273         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5274                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5275                 if (ulen > 0)
5276                         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5277                                                ulen);
5278         }
5279
5280         err = -ENOMEM;
5281         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5282                                       elem.key_end.val.data, elem.data.val.data,
5283                                       timeout, expiration, GFP_KERNEL);
5284         if (elem.priv == NULL)
5285                 goto err_parse_data;
5286
5287         ext = nft_set_elem_ext(set, elem.priv);
5288         if (flags)
5289                 *nft_set_ext_flags(ext) = flags;
5290         if (ulen > 0) {
5291                 udata = nft_set_ext_userdata(ext);
5292                 udata->len = ulen - 1;
5293                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5294         }
5295         if (obj) {
5296                 *nft_set_ext_obj(ext) = obj;
5297                 obj->use++;
5298         }
5299         if (expr) {
5300                 memcpy(nft_set_ext_expr(ext), expr, expr->ops->size);
5301                 kfree(expr);
5302                 expr = NULL;
5303         }
5304
5305         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5306         if (trans == NULL)
5307                 goto err_trans;
5308
5309         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
5310         err = set->ops->insert(ctx->net, set, &elem, &ext2);
5311         if (err) {
5312                 if (err == -EEXIST) {
5313                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5314                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5315                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
5316                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
5317                                 goto err_element_clash;
5318                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5319                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5320                              memcmp(nft_set_ext_data(ext),
5321                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
5322                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5323                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5324                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
5325                                 goto err_element_clash;
5326                         else if (!(nlmsg_flags & NLM_F_EXCL))
5327                                 err = 0;
5328                 } else if (err == -ENOTEMPTY) {
5329                         /* ENOTEMPTY reports overlapping between this element
5330                          * and an existing one.
5331                          */
5332                         err = -EEXIST;
5333                 }
5334                 goto err_element_clash;
5335         }
5336
5337         if (set->size &&
5338             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5339                 err = -ENFILE;
5340                 goto err_set_full;
5341         }
5342
5343         nft_trans_elem(trans) = elem;
5344         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5345         return 0;
5346
5347 err_set_full:
5348         set->ops->remove(ctx->net, set, &elem);
5349 err_element_clash:
5350         kfree(trans);
5351 err_trans:
5352         if (obj)
5353                 obj->use--;
5354
5355         nf_tables_set_elem_destroy(ctx, set, elem.priv);
5356 err_parse_data:
5357         if (nla[NFTA_SET_ELEM_DATA] != NULL)
5358                 nft_data_release(&elem.data.val, desc.type);
5359 err_parse_key_end:
5360         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
5361 err_parse_key:
5362         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5363 err_set_elem_expr:
5364         if (expr != NULL)
5365                 nft_expr_destroy(ctx, expr);
5366
5367         return err;
5368 }
5369
5370 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
5371                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5372                                 const struct nlattr * const nla[],
5373                                 struct netlink_ext_ack *extack)
5374 {
5375         u8 genmask = nft_genmask_next(net);
5376         const struct nlattr *attr;
5377         struct nft_set *set;
5378         struct nft_ctx ctx;
5379         int rem, err;
5380
5381         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
5382                 return -EINVAL;
5383
5384         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5385                                          genmask);
5386         if (err < 0)
5387                 return err;
5388
5389         set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
5390                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
5391         if (IS_ERR(set))
5392                 return PTR_ERR(set);
5393
5394         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5395                 return -EBUSY;
5396
5397         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5398                 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
5399                 if (err < 0)
5400                         return err;
5401         }
5402
5403         if (net->nft.validate_state == NFT_VALIDATE_DO)
5404                 return nft_table_validate(net, ctx.table);
5405
5406         return 0;
5407 }
5408
5409 /**
5410  *      nft_data_hold - hold a nft_data item
5411  *
5412  *      @data: struct nft_data to release
5413  *      @type: type of data
5414  *
5415  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5416  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
5417  *      NFT_GOTO verdicts. This function must be called on active data objects
5418  *      from the second phase of the commit protocol.
5419  */
5420 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
5421 {
5422         struct nft_chain *chain;
5423         struct nft_rule *rule;
5424
5425         if (type == NFT_DATA_VERDICT) {
5426                 switch (data->verdict.code) {
5427                 case NFT_JUMP:
5428                 case NFT_GOTO:
5429                         chain = data->verdict.chain;
5430                         chain->use++;
5431
5432                         if (!nft_chain_is_bound(chain))
5433                                 break;
5434
5435                         chain->table->use++;
5436                         list_for_each_entry(rule, &chain->rules, list)
5437                                 chain->use++;
5438
5439                         nft_chain_add(chain->table, chain);
5440                         break;
5441                 }
5442         }
5443 }
5444
5445 static void nft_set_elem_activate(const struct net *net,
5446                                   const struct nft_set *set,
5447                                   struct nft_set_elem *elem)
5448 {
5449         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5450
5451         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5452                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
5453         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5454                 (*nft_set_ext_obj(ext))->use++;
5455 }
5456
5457 static void nft_set_elem_deactivate(const struct net *net,
5458                                     const struct nft_set *set,
5459                                     struct nft_set_elem *elem)
5460 {
5461         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5462
5463         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5464                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5465         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5466                 (*nft_set_ext_obj(ext))->use--;
5467 }
5468
5469 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
5470                            const struct nlattr *attr)
5471 {
5472         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5473         struct nft_set_ext_tmpl tmpl;
5474         struct nft_set_elem elem;
5475         struct nft_set_ext *ext;
5476         struct nft_trans *trans;
5477         u32 flags = 0;
5478         void *priv;
5479         int err;
5480
5481         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5482                                           nft_set_elem_policy, NULL);
5483         if (err < 0)
5484                 return err;
5485
5486         if (nla[NFTA_SET_ELEM_KEY] == NULL)
5487                 return -EINVAL;
5488
5489         nft_set_ext_prepare(&tmpl);
5490
5491         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5492         if (err < 0)
5493                 return err;
5494         if (flags != 0)
5495                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5496
5497         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5498                                     nla[NFTA_SET_ELEM_KEY]);
5499         if (err < 0)
5500                 return err;
5501
5502         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5503
5504         if (nla[NFTA_SET_ELEM_KEY_END]) {
5505                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5506                                             nla[NFTA_SET_ELEM_KEY_END]);
5507                 if (err < 0)
5508                         return err;
5509
5510                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5511         }
5512
5513         err = -ENOMEM;
5514         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5515                                       elem.key_end.val.data, NULL, 0, 0,
5516                                       GFP_KERNEL);
5517         if (elem.priv == NULL)
5518                 goto fail_elem;
5519
5520         ext = nft_set_elem_ext(set, elem.priv);
5521         if (flags)
5522                 *nft_set_ext_flags(ext) = flags;
5523
5524         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
5525         if (trans == NULL)
5526                 goto fail_trans;
5527
5528         priv = set->ops->deactivate(ctx->net, set, &elem);
5529         if (priv == NULL) {
5530                 err = -ENOENT;
5531                 goto fail_ops;
5532         }
5533         kfree(elem.priv);
5534         elem.priv = priv;
5535
5536         nft_set_elem_deactivate(ctx->net, set, &elem);
5537
5538         nft_trans_elem(trans) = elem;
5539         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5540         return 0;
5541
5542 fail_ops:
5543         kfree(trans);
5544 fail_trans:
5545         kfree(elem.priv);
5546 fail_elem:
5547         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5548         return err;
5549 }
5550
5551 static int nft_flush_set(const struct nft_ctx *ctx,
5552                          struct nft_set *set,
5553                          const struct nft_set_iter *iter,
5554                          struct nft_set_elem *elem)
5555 {
5556         struct nft_trans *trans;
5557         int err;
5558
5559         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
5560                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
5561         if (!trans)
5562                 return -ENOMEM;
5563
5564         if (!set->ops->flush(ctx->net, set, elem->priv)) {
5565                 err = -ENOENT;
5566                 goto err1;
5567         }
5568         set->ndeact++;
5569
5570         nft_set_elem_deactivate(ctx->net, set, elem);
5571         nft_trans_elem_set(trans) = set;
5572         nft_trans_elem(trans) = *elem;
5573         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5574
5575         return 0;
5576 err1:
5577         kfree(trans);
5578         return err;
5579 }
5580
5581 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
5582                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5583                                 const struct nlattr * const nla[],
5584                                 struct netlink_ext_ack *extack)
5585 {
5586         u8 genmask = nft_genmask_next(net);
5587         const struct nlattr *attr;
5588         struct nft_set *set;
5589         struct nft_ctx ctx;
5590         int rem, err = 0;
5591
5592         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5593                                          genmask);
5594         if (err < 0)
5595                 return err;
5596
5597         set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5598         if (IS_ERR(set))
5599                 return PTR_ERR(set);
5600         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5601                 return -EBUSY;
5602
5603         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
5604                 struct nft_set_iter iter = {
5605                         .genmask        = genmask,
5606                         .fn             = nft_flush_set,
5607                 };
5608                 set->ops->walk(&ctx, set, &iter);
5609
5610                 return iter.err;
5611         }
5612
5613         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5614                 err = nft_del_setelem(&ctx, set, attr);
5615                 if (err < 0)
5616                         break;
5617
5618                 set->ndeact++;
5619         }
5620         return err;
5621 }
5622
5623 void nft_set_gc_batch_release(struct rcu_head *rcu)
5624 {
5625         struct nft_set_gc_batch *gcb;
5626         unsigned int i;
5627
5628         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
5629         for (i = 0; i < gcb->head.cnt; i++)
5630                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
5631         kfree(gcb);
5632 }
5633
5634 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
5635                                                 gfp_t gfp)
5636 {
5637         struct nft_set_gc_batch *gcb;
5638
5639         gcb = kzalloc(sizeof(*gcb), gfp);
5640         if (gcb == NULL)
5641                 return gcb;
5642         gcb->head.set = set;
5643         return gcb;
5644 }
5645
5646 /*
5647  * Stateful objects
5648  */
5649
5650 /**
5651  *      nft_register_obj- register nf_tables stateful object type
5652  *      @obj_type: object type
5653  *
5654  *      Registers the object type for use with nf_tables. Returns zero on
5655  *      success or a negative errno code otherwise.
5656  */
5657 int nft_register_obj(struct nft_object_type *obj_type)
5658 {
5659         if (obj_type->type == NFT_OBJECT_UNSPEC)
5660                 return -EINVAL;
5661
5662         nfnl_lock(NFNL_SUBSYS_NFTABLES);
5663         list_add_rcu(&obj_type->list, &nf_tables_objects);
5664         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5665         return 0;
5666 }
5667 EXPORT_SYMBOL_GPL(nft_register_obj);
5668
5669 /**
5670  *      nft_unregister_obj - unregister nf_tables object type
5671  *      @obj_type: object type
5672  *
5673  *      Unregisters the object type for use with nf_tables.
5674  */
5675 void nft_unregister_obj(struct nft_object_type *obj_type)
5676 {
5677         nfnl_lock(NFNL_SUBSYS_NFTABLES);
5678         list_del_rcu(&obj_type->list);
5679         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5680 }
5681 EXPORT_SYMBOL_GPL(nft_unregister_obj);
5682
5683 struct nft_object *nft_obj_lookup(const struct net *net,
5684                                   const struct nft_table *table,
5685                                   const struct nlattr *nla, u32 objtype,
5686                                   u8 genmask)
5687 {
5688         struct nft_object_hash_key k = { .table = table };
5689         char search[NFT_OBJ_MAXNAMELEN];
5690         struct rhlist_head *tmp, *list;
5691         struct nft_object *obj;
5692
5693         nla_strlcpy(search, nla, sizeof(search));
5694         k.name = search;
5695
5696         WARN_ON_ONCE(!rcu_read_lock_held() &&
5697                      !lockdep_commit_lock_is_held(net));
5698
5699         rcu_read_lock();
5700         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
5701         if (!list)
5702                 goto out;
5703
5704         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
5705                 if (objtype == obj->ops->type->type &&
5706                     nft_active_genmask(obj, genmask)) {
5707                         rcu_read_unlock();
5708                         return obj;
5709                 }
5710         }
5711 out:
5712         rcu_read_unlock();
5713         return ERR_PTR(-ENOENT);
5714 }
5715 EXPORT_SYMBOL_GPL(nft_obj_lookup);
5716
5717 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
5718                                                   const struct nlattr *nla,
5719                                                   u32 objtype, u8 genmask)
5720 {
5721         struct nft_object *obj;
5722
5723         list_for_each_entry(obj, &table->objects, list) {
5724                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
5725                     objtype == obj->ops->type->type &&
5726                     nft_active_genmask(obj, genmask))
5727                         return obj;
5728         }
5729         return ERR_PTR(-ENOENT);
5730 }
5731
5732 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
5733         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
5734                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
5735         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
5736                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
5737         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
5738         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
5739         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
5740 };
5741
5742 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
5743                                        const struct nft_object_type *type,
5744                                        const struct nlattr *attr)
5745 {
5746         struct nlattr **tb;
5747         const struct nft_object_ops *ops;
5748         struct nft_object *obj;
5749         int err = -ENOMEM;
5750
5751         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
5752         if (!tb)
5753                 goto err1;
5754
5755         if (attr) {
5756                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
5757                                                   type->policy, NULL);
5758                 if (err < 0)
5759                         goto err2;
5760         } else {
5761                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
5762         }
5763
5764         if (type->select_ops) {
5765                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
5766                 if (IS_ERR(ops)) {
5767                         err = PTR_ERR(ops);
5768                         goto err2;
5769                 }
5770         } else {
5771                 ops = type->ops;
5772         }
5773
5774         err = -ENOMEM;
5775         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
5776         if (!obj)
5777                 goto err2;
5778
5779         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
5780         if (err < 0)
5781                 goto err3;
5782
5783         obj->ops = ops;
5784
5785         kfree(tb);
5786         return obj;
5787 err3:
5788         kfree(obj);
5789 err2:
5790         kfree(tb);
5791 err1:
5792         return ERR_PTR(err);
5793 }
5794
5795 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
5796                            struct nft_object *obj, bool reset)
5797 {
5798         struct nlattr *nest;
5799
5800         nest = nla_nest_start_noflag(skb, attr);
5801         if (!nest)
5802                 goto nla_put_failure;
5803         if (obj->ops->dump(skb, obj, reset) < 0)
5804                 goto nla_put_failure;
5805         nla_nest_end(skb, nest);
5806         return 0;
5807
5808 nla_put_failure:
5809         return -1;
5810 }
5811
5812 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
5813 {
5814         const struct nft_object_type *type;
5815
5816         list_for_each_entry(type, &nf_tables_objects, list) {
5817                 if (objtype == type->type)
5818                         return type;
5819         }
5820         return NULL;
5821 }
5822
5823 static const struct nft_object_type *
5824 nft_obj_type_get(struct net *net, u32 objtype)
5825 {
5826         const struct nft_object_type *type;
5827
5828         type = __nft_obj_type_get(objtype);
5829         if (type != NULL && try_module_get(type->owner))
5830                 return type;
5831
5832         lockdep_nfnl_nft_mutex_not_held();
5833 #ifdef CONFIG_MODULES
5834         if (type == NULL) {
5835                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
5836                         return ERR_PTR(-EAGAIN);
5837         }
5838 #endif
5839         return ERR_PTR(-ENOENT);
5840 }
5841
5842 static int nf_tables_updobj(const struct nft_ctx *ctx,
5843                             const struct nft_object_type *type,
5844                             const struct nlattr *attr,
5845                             struct nft_object *obj)
5846 {
5847         struct nft_object *newobj;
5848         struct nft_trans *trans;
5849         int err;
5850
5851         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
5852                                 sizeof(struct nft_trans_obj));
5853         if (!trans)
5854                 return -ENOMEM;
5855
5856         newobj = nft_obj_init(ctx, type, attr);
5857         if (IS_ERR(newobj)) {
5858                 err = PTR_ERR(newobj);
5859                 goto err_free_trans;
5860         }
5861
5862         nft_trans_obj(trans) = obj;
5863         nft_trans_obj_update(trans) = true;
5864         nft_trans_obj_newobj(trans) = newobj;
5865         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5866
5867         return 0;
5868
5869 err_free_trans:
5870         kfree(trans);
5871         return err;
5872 }
5873
5874 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
5875                             struct sk_buff *skb, const struct nlmsghdr *nlh,
5876                             const struct nlattr * const nla[],
5877                             struct netlink_ext_ack *extack)
5878 {
5879         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5880         const struct nft_object_type *type;
5881         u8 genmask = nft_genmask_next(net);
5882         int family = nfmsg->nfgen_family;
5883         struct nft_table *table;
5884         struct nft_object *obj;
5885         struct nft_ctx ctx;
5886         u32 objtype;
5887         int err;
5888
5889         if (!nla[NFTA_OBJ_TYPE] ||
5890             !nla[NFTA_OBJ_NAME] ||
5891             !nla[NFTA_OBJ_DATA])
5892                 return -EINVAL;
5893
5894         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5895         if (IS_ERR(table)) {
5896                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5897                 return PTR_ERR(table);
5898         }
5899
5900         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5901         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
5902         if (IS_ERR(obj)) {
5903                 err = PTR_ERR(obj);
5904                 if (err != -ENOENT) {
5905                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5906                         return err;
5907                 }
5908         } else {
5909                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5910                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5911                         return -EEXIST;
5912                 }
5913                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
5914                         return -EOPNOTSUPP;
5915
5916                 type = __nft_obj_type_get(objtype);
5917                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5918
5919                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
5920         }
5921
5922         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5923
5924         type = nft_obj_type_get(net, objtype);
5925         if (IS_ERR(type))
5926                 return PTR_ERR(type);
5927
5928         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
5929         if (IS_ERR(obj)) {
5930                 err = PTR_ERR(obj);
5931                 goto err1;
5932         }
5933         obj->key.table = table;
5934         obj->handle = nf_tables_alloc_handle(table);
5935
5936         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
5937         if (!obj->key.name) {
5938                 err = -ENOMEM;
5939                 goto err2;
5940         }
5941
5942         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
5943         if (err < 0)
5944                 goto err3;
5945
5946         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
5947                               nft_objname_ht_params);
5948         if (err < 0)
5949                 goto err4;
5950
5951         list_add_tail_rcu(&obj->list, &table->objects);
5952         table->use++;
5953         return 0;
5954 err4:
5955         /* queued in transaction log */
5956         INIT_LIST_HEAD(&obj->list);
5957         return err;
5958 err3:
5959         kfree(obj->key.name);
5960 err2:
5961         if (obj->ops->destroy)
5962                 obj->ops->destroy(&ctx, obj);
5963         kfree(obj);
5964 err1:
5965         module_put(type->owner);
5966         return err;
5967 }
5968
5969 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
5970                                    u32 portid, u32 seq, int event, u32 flags,
5971                                    int family, const struct nft_table *table,
5972                                    struct nft_object *obj, bool reset)
5973 {
5974         struct nfgenmsg *nfmsg;
5975         struct nlmsghdr *nlh;
5976
5977         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5978         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5979         if (nlh == NULL)
5980                 goto nla_put_failure;
5981
5982         nfmsg = nlmsg_data(nlh);
5983         nfmsg->nfgen_family     = family;
5984         nfmsg->version          = NFNETLINK_V0;
5985         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
5986
5987         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
5988             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
5989             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
5990             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
5991             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
5992             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
5993                          NFTA_OBJ_PAD))
5994                 goto nla_put_failure;
5995
5996         nlmsg_end(skb, nlh);
5997         return 0;
5998
5999 nla_put_failure:
6000         nlmsg_trim(skb, nlh);
6001         return -1;
6002 }
6003
6004 struct nft_obj_filter {
6005         char            *table;
6006         u32             type;
6007 };
6008
6009 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6010 {
6011         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6012         const struct nft_table *table;
6013         unsigned int idx = 0, s_idx = cb->args[0];
6014         struct nft_obj_filter *filter = cb->data;
6015         struct net *net = sock_net(skb->sk);
6016         int family = nfmsg->nfgen_family;
6017         struct nft_object *obj;
6018         bool reset = false;
6019
6020         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6021                 reset = true;
6022
6023         rcu_read_lock();
6024         cb->seq = net->nft.base_seq;
6025
6026         list_for_each_entry_rcu(table, &net->nft.tables, list) {
6027                 if (family != NFPROTO_UNSPEC && family != table->family)
6028                         continue;
6029
6030                 list_for_each_entry_rcu(obj, &table->objects, list) {
6031                         if (!nft_is_active(net, obj))
6032                                 goto cont;
6033                         if (idx < s_idx)
6034                                 goto cont;
6035                         if (idx > s_idx)
6036                                 memset(&cb->args[1], 0,
6037                                        sizeof(cb->args) - sizeof(cb->args[0]));
6038                         if (filter && filter->table &&
6039                             strcmp(filter->table, table->name))
6040                                 goto cont;
6041                         if (filter &&
6042                             filter->type != NFT_OBJECT_UNSPEC &&
6043                             obj->ops->type->type != filter->type)
6044                                 goto cont;
6045
6046                         if (reset) {
6047                                 char *buf = kasprintf(GFP_ATOMIC,
6048                                                       "%s:%llu;?:0",
6049                                                       table->name,
6050                                                       table->handle);
6051
6052                                 audit_log_nfcfg(buf,
6053                                                 family,
6054                                                 obj->handle,
6055                                                 AUDIT_NFT_OP_OBJ_RESET,
6056                                                 GFP_ATOMIC);
6057                                 kfree(buf);
6058                         }
6059
6060                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6061                                                     cb->nlh->nlmsg_seq,
6062                                                     NFT_MSG_NEWOBJ,
6063                                                     NLM_F_MULTI | NLM_F_APPEND,
6064                                                     table->family, table,
6065                                                     obj, reset) < 0)
6066                                 goto done;
6067
6068                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6069 cont:
6070                         idx++;
6071                 }
6072         }
6073 done:
6074         rcu_read_unlock();
6075
6076         cb->args[0] = idx;
6077         return skb->len;
6078 }
6079
6080 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6081 {
6082         const struct nlattr * const *nla = cb->data;
6083         struct nft_obj_filter *filter = NULL;
6084
6085         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6086                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6087                 if (!filter)
6088                         return -ENOMEM;
6089
6090                 if (nla[NFTA_OBJ_TABLE]) {
6091                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6092                         if (!filter->table) {
6093                                 kfree(filter);
6094                                 return -ENOMEM;
6095                         }
6096                 }
6097
6098                 if (nla[NFTA_OBJ_TYPE])
6099                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6100         }
6101
6102         cb->data = filter;
6103         return 0;
6104 }
6105
6106 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6107 {
6108         struct nft_obj_filter *filter = cb->data;
6109
6110         if (filter) {
6111                 kfree(filter->table);
6112                 kfree(filter);
6113         }
6114
6115         return 0;
6116 }
6117
6118 /* called with rcu_read_lock held */
6119 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
6120                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6121                             const struct nlattr * const nla[],
6122                             struct netlink_ext_ack *extack)
6123 {
6124         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6125         u8 genmask = nft_genmask_cur(net);
6126         int family = nfmsg->nfgen_family;
6127         const struct nft_table *table;
6128         struct nft_object *obj;
6129         struct sk_buff *skb2;
6130         bool reset = false;
6131         u32 objtype;
6132         int err;
6133
6134         if (nlh->nlmsg_flags & NLM_F_DUMP) {
6135                 struct netlink_dump_control c = {
6136                         .start = nf_tables_dump_obj_start,
6137                         .dump = nf_tables_dump_obj,
6138                         .done = nf_tables_dump_obj_done,
6139                         .module = THIS_MODULE,
6140                         .data = (void *)nla,
6141                 };
6142
6143                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
6144         }
6145
6146         if (!nla[NFTA_OBJ_NAME] ||
6147             !nla[NFTA_OBJ_TYPE])
6148                 return -EINVAL;
6149
6150         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
6151         if (IS_ERR(table)) {
6152                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6153                 return PTR_ERR(table);
6154         }
6155
6156         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6157         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6158         if (IS_ERR(obj)) {
6159                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6160                 return PTR_ERR(obj);
6161         }
6162
6163         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6164         if (!skb2)
6165                 return -ENOMEM;
6166
6167         if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6168                 reset = true;
6169
6170         if (reset) {
6171                 char *buf = kasprintf(GFP_ATOMIC, "%s:%llu;?:0",
6172                                       table->name, table->handle);
6173
6174                 audit_log_nfcfg(buf,
6175                                 family,
6176                                 obj->handle,
6177                                 AUDIT_NFT_OP_OBJ_RESET,
6178                                 GFP_ATOMIC);
6179                 kfree(buf);
6180         }
6181
6182         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6183                                       nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
6184                                       family, table, obj, reset);
6185         if (err < 0)
6186                 goto err_fill_obj_info;
6187
6188         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6189
6190 err_fill_obj_info:
6191         kfree_skb(skb2);
6192         return err;
6193 }
6194
6195 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
6196 {
6197         if (obj->ops->destroy)
6198                 obj->ops->destroy(ctx, obj);
6199
6200         module_put(obj->ops->type->owner);
6201         kfree(obj->key.name);
6202         kfree(obj);
6203 }
6204
6205 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
6206                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6207                             const struct nlattr * const nla[],
6208                             struct netlink_ext_ack *extack)
6209 {
6210         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6211         u8 genmask = nft_genmask_next(net);
6212         int family = nfmsg->nfgen_family;
6213         const struct nlattr *attr;
6214         struct nft_table *table;
6215         struct nft_object *obj;
6216         struct nft_ctx ctx;
6217         u32 objtype;
6218
6219         if (!nla[NFTA_OBJ_TYPE] ||
6220             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
6221                 return -EINVAL;
6222
6223         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
6224         if (IS_ERR(table)) {
6225                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6226                 return PTR_ERR(table);
6227         }
6228
6229         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6230         if (nla[NFTA_OBJ_HANDLE]) {
6231                 attr = nla[NFTA_OBJ_HANDLE];
6232                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
6233         } else {
6234                 attr = nla[NFTA_OBJ_NAME];
6235                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
6236         }
6237
6238         if (IS_ERR(obj)) {
6239                 NL_SET_BAD_ATTR(extack, attr);
6240                 return PTR_ERR(obj);
6241         }
6242         if (obj->use > 0) {
6243                 NL_SET_BAD_ATTR(extack, attr);
6244                 return -EBUSY;
6245         }
6246
6247         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6248
6249         return nft_delobj(&ctx, obj);
6250 }
6251
6252 void nft_obj_notify(struct net *net, const struct nft_table *table,
6253                     struct nft_object *obj, u32 portid, u32 seq, int event,
6254                     int family, int report, gfp_t gfp)
6255 {
6256         struct sk_buff *skb;
6257         int err;
6258         char *buf = kasprintf(gfp, "%s:%llu;?:0",
6259                               table->name, table->handle);
6260
6261         audit_log_nfcfg(buf,
6262                         family,
6263                         obj->handle,
6264                         event == NFT_MSG_NEWOBJ ?
6265                                 AUDIT_NFT_OP_OBJ_REGISTER :
6266                                 AUDIT_NFT_OP_OBJ_UNREGISTER,
6267                         gfp);
6268         kfree(buf);
6269
6270         if (!report &&
6271             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6272                 return;
6273
6274         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
6275         if (skb == NULL)
6276                 goto err;
6277
6278         err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
6279                                       table, obj, false);
6280         if (err < 0) {
6281                 kfree_skb(skb);
6282                 goto err;
6283         }
6284
6285         nft_notify_enqueue(skb, report, &net->nft.notify_list);
6286         return;
6287 err:
6288         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6289 }
6290 EXPORT_SYMBOL_GPL(nft_obj_notify);
6291
6292 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
6293                                  struct nft_object *obj, int event)
6294 {
6295         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
6296                        ctx->family, ctx->report, GFP_KERNEL);
6297 }
6298
6299 /*
6300  * Flow tables
6301  */
6302 void nft_register_flowtable_type(struct nf_flowtable_type *type)
6303 {
6304         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6305         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
6306         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6307 }
6308 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
6309
6310 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
6311 {
6312         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6313         list_del_rcu(&type->list);
6314         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6315 }
6316 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
6317
6318 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
6319         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
6320                                             .len = NFT_NAME_MAXLEN - 1 },
6321         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
6322                                             .len = NFT_NAME_MAXLEN - 1 },
6323         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
6324         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
6325         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
6326 };
6327
6328 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
6329                                            const struct nlattr *nla, u8 genmask)
6330 {
6331         struct nft_flowtable *flowtable;
6332
6333         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6334                 if (!nla_strcmp(nla, flowtable->name) &&
6335                     nft_active_genmask(flowtable, genmask))
6336                         return flowtable;
6337         }
6338         return ERR_PTR(-ENOENT);
6339 }
6340 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
6341
6342 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
6343                                     struct nft_flowtable *flowtable,
6344                                     enum nft_trans_phase phase)
6345 {
6346         switch (phase) {
6347         case NFT_TRANS_PREPARE:
6348         case NFT_TRANS_ABORT:
6349         case NFT_TRANS_RELEASE:
6350                 flowtable->use--;
6351                 fallthrough;
6352         default:
6353                 return;
6354         }
6355 }
6356 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
6357
6358 static struct nft_flowtable *
6359 nft_flowtable_lookup_byhandle(const struct nft_table *table,
6360                               const struct nlattr *nla, u8 genmask)
6361 {
6362        struct nft_flowtable *flowtable;
6363
6364        list_for_each_entry(flowtable, &table->flowtables, list) {
6365                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
6366                    nft_active_genmask(flowtable, genmask))
6367                        return flowtable;
6368        }
6369        return ERR_PTR(-ENOENT);
6370 }
6371
6372 struct nft_flowtable_hook {
6373         u32                     num;
6374         int                     priority;
6375         struct list_head        list;
6376 };
6377
6378 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
6379         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
6380         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
6381         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
6382 };
6383
6384 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
6385                                     const struct nlattr *attr,
6386                                     struct nft_flowtable_hook *flowtable_hook,
6387                                     struct nft_flowtable *flowtable, bool add)
6388 {
6389         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
6390         struct nft_hook *hook;
6391         int hooknum, priority;
6392         int err;
6393
6394         INIT_LIST_HEAD(&flowtable_hook->list);
6395
6396         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
6397                                           nft_flowtable_hook_policy, NULL);
6398         if (err < 0)
6399                 return err;
6400
6401         if (add) {
6402                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
6403                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
6404                         return -EINVAL;
6405
6406                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6407                 if (hooknum != NF_NETDEV_INGRESS)
6408                         return -EOPNOTSUPP;
6409
6410                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6411
6412                 flowtable_hook->priority        = priority;
6413                 flowtable_hook->num             = hooknum;
6414         } else {
6415                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
6416                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6417                         if (hooknum != flowtable->hooknum)
6418                                 return -EOPNOTSUPP;
6419                 }
6420
6421                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
6422                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6423                         if (priority != flowtable->data.priority)
6424                                 return -EOPNOTSUPP;
6425                 }
6426
6427                 flowtable_hook->priority        = flowtable->data.priority;
6428                 flowtable_hook->num             = flowtable->hooknum;
6429         }
6430
6431         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
6432                 err = nf_tables_parse_netdev_hooks(ctx->net,
6433                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
6434                                                    &flowtable_hook->list);
6435                 if (err < 0)
6436                         return err;
6437         }
6438
6439         list_for_each_entry(hook, &flowtable_hook->list, list) {
6440                 hook->ops.pf            = NFPROTO_NETDEV;
6441                 hook->ops.hooknum       = flowtable_hook->num;
6442                 hook->ops.priority      = flowtable_hook->priority;
6443                 hook->ops.priv          = &flowtable->data;
6444                 hook->ops.hook          = flowtable->data.type->hook;
6445         }
6446
6447         return err;
6448 }
6449
6450 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
6451 {
6452         const struct nf_flowtable_type *type;
6453
6454         list_for_each_entry(type, &nf_tables_flowtables, list) {
6455                 if (family == type->family)
6456                         return type;
6457         }
6458         return NULL;
6459 }
6460
6461 static const struct nf_flowtable_type *
6462 nft_flowtable_type_get(struct net *net, u8 family)
6463 {
6464         const struct nf_flowtable_type *type;
6465
6466         type = __nft_flowtable_type_get(family);
6467         if (type != NULL && try_module_get(type->owner))
6468                 return type;
6469
6470         lockdep_nfnl_nft_mutex_not_held();
6471 #ifdef CONFIG_MODULES
6472         if (type == NULL) {
6473                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
6474                         return ERR_PTR(-EAGAIN);
6475         }
6476 #endif
6477         return ERR_PTR(-ENOENT);
6478 }
6479
6480 /* Only called from error and netdev event paths. */
6481 static void nft_unregister_flowtable_hook(struct net *net,
6482                                           struct nft_flowtable *flowtable,
6483                                           struct nft_hook *hook)
6484 {
6485         nf_unregister_net_hook(net, &hook->ops);
6486         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
6487                                     FLOW_BLOCK_UNBIND);
6488 }
6489
6490 static void nft_unregister_flowtable_net_hooks(struct net *net,
6491                                                struct list_head *hook_list)
6492 {
6493         struct nft_hook *hook;
6494
6495         list_for_each_entry(hook, hook_list, list)
6496                 nf_unregister_net_hook(net, &hook->ops);
6497 }
6498
6499 static int nft_register_flowtable_net_hooks(struct net *net,
6500                                             struct nft_table *table,
6501                                             struct list_head *hook_list,
6502                                             struct nft_flowtable *flowtable)
6503 {
6504         struct nft_hook *hook, *hook2, *next;
6505         struct nft_flowtable *ft;
6506         int err, i = 0;
6507
6508         list_for_each_entry(hook, hook_list, list) {
6509                 list_for_each_entry(ft, &table->flowtables, list) {
6510                         list_for_each_entry(hook2, &ft->hook_list, list) {
6511                                 if (hook->ops.dev == hook2->ops.dev &&
6512                                     hook->ops.pf == hook2->ops.pf) {
6513                                         err = -EEXIST;
6514                                         goto err_unregister_net_hooks;
6515                                 }
6516                         }
6517                 }
6518
6519                 err = flowtable->data.type->setup(&flowtable->data,
6520                                                   hook->ops.dev,
6521                                                   FLOW_BLOCK_BIND);
6522                 if (err < 0)
6523                         goto err_unregister_net_hooks;
6524
6525                 err = nf_register_net_hook(net, &hook->ops);
6526                 if (err < 0) {
6527                         flowtable->data.type->setup(&flowtable->data,
6528                                                     hook->ops.dev,
6529                                                     FLOW_BLOCK_UNBIND);
6530                         goto err_unregister_net_hooks;
6531                 }
6532
6533                 i++;
6534         }
6535
6536         return 0;
6537
6538 err_unregister_net_hooks:
6539         list_for_each_entry_safe(hook, next, hook_list, list) {
6540                 if (i-- <= 0)
6541                         break;
6542
6543                 nft_unregister_flowtable_hook(net, flowtable, hook);
6544                 list_del_rcu(&hook->list);
6545                 kfree_rcu(hook, rcu);
6546         }
6547
6548         return err;
6549 }
6550
6551 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
6552 {
6553         struct nft_hook *hook, *next;
6554
6555         list_for_each_entry_safe(hook, next, hook_list, list) {
6556                 list_del_rcu(&hook->list);
6557                 kfree_rcu(hook, rcu);
6558         }
6559 }
6560
6561 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
6562                                 struct nft_flowtable *flowtable)
6563 {
6564         const struct nlattr * const *nla = ctx->nla;
6565         struct nft_flowtable_hook flowtable_hook;
6566         struct nft_hook *hook, *next;
6567         struct nft_trans *trans;
6568         bool unregister = false;
6569         int err;
6570
6571         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
6572                                        &flowtable_hook, flowtable, false);
6573         if (err < 0)
6574                 return err;
6575
6576         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6577                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
6578                         list_del(&hook->list);
6579                         kfree(hook);
6580                 }
6581         }
6582
6583         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
6584                                                &flowtable_hook.list, flowtable);
6585         if (err < 0)
6586                 goto err_flowtable_update_hook;
6587
6588         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
6589                                 sizeof(struct nft_trans_flowtable));
6590         if (!trans) {
6591                 unregister = true;
6592                 err = -ENOMEM;
6593                 goto err_flowtable_update_hook;
6594         }
6595
6596         nft_trans_flowtable(trans) = flowtable;
6597         nft_trans_flowtable_update(trans) = true;
6598         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
6599         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
6600
6601         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6602
6603         return 0;
6604
6605 err_flowtable_update_hook:
6606         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6607                 if (unregister)
6608                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
6609                 list_del_rcu(&hook->list);
6610                 kfree_rcu(hook, rcu);
6611         }
6612
6613         return err;
6614
6615 }
6616
6617 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
6618                                   struct sk_buff *skb,
6619                                   const struct nlmsghdr *nlh,
6620                                   const struct nlattr * const nla[],
6621                                   struct netlink_ext_ack *extack)
6622 {
6623         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6624         struct nft_flowtable_hook flowtable_hook;
6625         const struct nf_flowtable_type *type;
6626         u8 genmask = nft_genmask_next(net);
6627         int family = nfmsg->nfgen_family;
6628         struct nft_flowtable *flowtable;
6629         struct nft_hook *hook, *next;
6630         struct nft_table *table;
6631         struct nft_ctx ctx;
6632         int err;
6633
6634         if (!nla[NFTA_FLOWTABLE_TABLE] ||
6635             !nla[NFTA_FLOWTABLE_NAME] ||
6636             !nla[NFTA_FLOWTABLE_HOOK])
6637                 return -EINVAL;
6638
6639         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6640                                  genmask);
6641         if (IS_ERR(table)) {
6642                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6643                 return PTR_ERR(table);
6644         }
6645
6646         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6647                                          genmask);
6648         if (IS_ERR(flowtable)) {
6649                 err = PTR_ERR(flowtable);
6650                 if (err != -ENOENT) {
6651                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6652                         return err;
6653                 }
6654         } else {
6655                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6656                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6657                         return -EEXIST;
6658                 }
6659
6660                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6661
6662                 return nft_flowtable_update(&ctx, nlh, flowtable);
6663         }
6664
6665         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6666
6667         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
6668         if (!flowtable)
6669                 return -ENOMEM;
6670
6671         flowtable->table = table;
6672         flowtable->handle = nf_tables_alloc_handle(table);
6673         INIT_LIST_HEAD(&flowtable->hook_list);
6674
6675         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
6676         if (!flowtable->name) {
6677                 err = -ENOMEM;
6678                 goto err1;
6679         }
6680
6681         type = nft_flowtable_type_get(net, family);
6682         if (IS_ERR(type)) {
6683                 err = PTR_ERR(type);
6684                 goto err2;
6685         }
6686
6687         if (nla[NFTA_FLOWTABLE_FLAGS]) {
6688                 flowtable->data.flags =
6689                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
6690                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK)
6691                         goto err3;
6692         }
6693
6694         write_pnet(&flowtable->data.net, net);
6695         flowtable->data.type = type;
6696         err = type->init(&flowtable->data);
6697         if (err < 0)
6698                 goto err3;
6699
6700         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
6701                                        &flowtable_hook, flowtable, true);
6702         if (err < 0)
6703                 goto err4;
6704
6705         list_splice(&flowtable_hook.list, &flowtable->hook_list);
6706         flowtable->data.priority = flowtable_hook.priority;
6707         flowtable->hooknum = flowtable_hook.num;
6708
6709         err = nft_register_flowtable_net_hooks(ctx.net, table,
6710                                                &flowtable->hook_list,
6711                                                flowtable);
6712         if (err < 0) {
6713                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
6714                 goto err4;
6715         }
6716
6717         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
6718         if (err < 0)
6719                 goto err5;
6720
6721         list_add_tail_rcu(&flowtable->list, &table->flowtables);
6722         table->use++;
6723
6724         return 0;
6725 err5:
6726         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
6727                 nft_unregister_flowtable_hook(net, flowtable, hook);
6728                 list_del_rcu(&hook->list);
6729                 kfree_rcu(hook, rcu);
6730         }
6731 err4:
6732         flowtable->data.type->free(&flowtable->data);
6733 err3:
6734         module_put(type->owner);
6735 err2:
6736         kfree(flowtable->name);
6737 err1:
6738         kfree(flowtable);
6739         return err;
6740 }
6741
6742 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
6743 {
6744         struct nft_hook *this, *next;
6745
6746         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
6747                 list_del(&this->list);
6748                 kfree(this);
6749         }
6750 }
6751
6752 static int nft_delflowtable_hook(struct nft_ctx *ctx,
6753                                  struct nft_flowtable *flowtable)
6754 {
6755         const struct nlattr * const *nla = ctx->nla;
6756         struct nft_flowtable_hook flowtable_hook;
6757         struct nft_hook *this, *hook;
6758         struct nft_trans *trans;
6759         int err;
6760
6761         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
6762                                        &flowtable_hook, flowtable, false);
6763         if (err < 0)
6764                 return err;
6765
6766         list_for_each_entry(this, &flowtable_hook.list, list) {
6767                 hook = nft_hook_list_find(&flowtable->hook_list, this);
6768                 if (!hook) {
6769                         err = -ENOENT;
6770                         goto err_flowtable_del_hook;
6771                 }
6772                 hook->inactive = true;
6773         }
6774
6775         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
6776                                 sizeof(struct nft_trans_flowtable));
6777         if (!trans) {
6778                 err = -ENOMEM;
6779                 goto err_flowtable_del_hook;
6780         }
6781
6782         nft_trans_flowtable(trans) = flowtable;
6783         nft_trans_flowtable_update(trans) = true;
6784         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
6785         nft_flowtable_hook_release(&flowtable_hook);
6786
6787         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6788
6789         return 0;
6790
6791 err_flowtable_del_hook:
6792         list_for_each_entry(this, &flowtable_hook.list, list) {
6793                 hook = nft_hook_list_find(&flowtable->hook_list, this);
6794                 if (!hook)
6795                         break;
6796
6797                 hook->inactive = false;
6798         }
6799         nft_flowtable_hook_release(&flowtable_hook);
6800
6801         return err;
6802 }
6803
6804 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
6805                                   struct sk_buff *skb,
6806                                   const struct nlmsghdr *nlh,
6807                                   const struct nlattr * const nla[],
6808                                   struct netlink_ext_ack *extack)
6809 {
6810         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6811         u8 genmask = nft_genmask_next(net);
6812         int family = nfmsg->nfgen_family;
6813         struct nft_flowtable *flowtable;
6814         const struct nlattr *attr;
6815         struct nft_table *table;
6816         struct nft_ctx ctx;
6817
6818         if (!nla[NFTA_FLOWTABLE_TABLE] ||
6819             (!nla[NFTA_FLOWTABLE_NAME] &&
6820              !nla[NFTA_FLOWTABLE_HANDLE]))
6821                 return -EINVAL;
6822
6823         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6824                                  genmask);
6825         if (IS_ERR(table)) {
6826                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6827                 return PTR_ERR(table);
6828         }
6829
6830         if (nla[NFTA_FLOWTABLE_HANDLE]) {
6831                 attr = nla[NFTA_FLOWTABLE_HANDLE];
6832                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
6833         } else {
6834                 attr = nla[NFTA_FLOWTABLE_NAME];
6835                 flowtable = nft_flowtable_lookup(table, attr, genmask);
6836         }
6837
6838         if (IS_ERR(flowtable)) {
6839                 NL_SET_BAD_ATTR(extack, attr);
6840                 return PTR_ERR(flowtable);
6841         }
6842
6843         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6844
6845         if (nla[NFTA_FLOWTABLE_HOOK])
6846                 return nft_delflowtable_hook(&ctx, flowtable);
6847
6848         if (flowtable->use > 0) {
6849                 NL_SET_BAD_ATTR(extack, attr);
6850                 return -EBUSY;
6851         }
6852
6853         return nft_delflowtable(&ctx, flowtable);
6854 }
6855
6856 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
6857                                          u32 portid, u32 seq, int event,
6858                                          u32 flags, int family,
6859                                          struct nft_flowtable *flowtable,
6860                                          struct list_head *hook_list)
6861 {
6862         struct nlattr *nest, *nest_devs;
6863         struct nfgenmsg *nfmsg;
6864         struct nft_hook *hook;
6865         struct nlmsghdr *nlh;
6866
6867         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6868         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
6869         if (nlh == NULL)
6870                 goto nla_put_failure;
6871
6872         nfmsg = nlmsg_data(nlh);
6873         nfmsg->nfgen_family     = family;
6874         nfmsg->version          = NFNETLINK_V0;
6875         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
6876
6877         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
6878             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
6879             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
6880             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
6881                          NFTA_FLOWTABLE_PAD) ||
6882             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
6883                 goto nla_put_failure;
6884
6885         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
6886         if (!nest)
6887                 goto nla_put_failure;
6888         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
6889             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
6890                 goto nla_put_failure;
6891
6892         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
6893         if (!nest_devs)
6894                 goto nla_put_failure;
6895
6896         list_for_each_entry_rcu(hook, hook_list, list) {
6897                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
6898                         goto nla_put_failure;
6899         }
6900         nla_nest_end(skb, nest_devs);
6901         nla_nest_end(skb, nest);
6902
6903         nlmsg_end(skb, nlh);
6904         return 0;
6905
6906 nla_put_failure:
6907         nlmsg_trim(skb, nlh);
6908         return -1;
6909 }
6910
6911 struct nft_flowtable_filter {
6912         char            *table;
6913 };
6914
6915 static int nf_tables_dump_flowtable(struct sk_buff *skb,
6916                                     struct netlink_callback *cb)
6917 {
6918         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6919         struct nft_flowtable_filter *filter = cb->data;
6920         unsigned int idx = 0, s_idx = cb->args[0];
6921         struct net *net = sock_net(skb->sk);
6922         int family = nfmsg->nfgen_family;
6923         struct nft_flowtable *flowtable;
6924         const struct nft_table *table;
6925
6926         rcu_read_lock();
6927         cb->seq = net->nft.base_seq;
6928
6929         list_for_each_entry_rcu(table, &net->nft.tables, list) {
6930                 if (family != NFPROTO_UNSPEC && family != table->family)
6931                         continue;
6932
6933                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6934                         if (!nft_is_active(net, flowtable))
6935                                 goto cont;
6936                         if (idx < s_idx)
6937                                 goto cont;
6938                         if (idx > s_idx)
6939                                 memset(&cb->args[1], 0,
6940                                        sizeof(cb->args) - sizeof(cb->args[0]));
6941                         if (filter && filter->table &&
6942                             strcmp(filter->table, table->name))
6943                                 goto cont;
6944
6945                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
6946                                                           cb->nlh->nlmsg_seq,
6947                                                           NFT_MSG_NEWFLOWTABLE,
6948                                                           NLM_F_MULTI | NLM_F_APPEND,
6949                                                           table->family,
6950                                                           flowtable,
6951                                                           &flowtable->hook_list) < 0)
6952                                 goto done;
6953
6954                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6955 cont:
6956                         idx++;
6957                 }
6958         }
6959 done:
6960         rcu_read_unlock();
6961
6962         cb->args[0] = idx;
6963         return skb->len;
6964 }
6965
6966 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
6967 {
6968         const struct nlattr * const *nla = cb->data;
6969         struct nft_flowtable_filter *filter = NULL;
6970
6971         if (nla[NFTA_FLOWTABLE_TABLE]) {
6972                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6973                 if (!filter)
6974                         return -ENOMEM;
6975
6976                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
6977                                            GFP_ATOMIC);
6978                 if (!filter->table) {
6979                         kfree(filter);
6980                         return -ENOMEM;
6981                 }
6982         }
6983
6984         cb->data = filter;
6985         return 0;
6986 }
6987
6988 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
6989 {
6990         struct nft_flowtable_filter *filter = cb->data;
6991
6992         if (!filter)
6993                 return 0;
6994
6995         kfree(filter->table);
6996         kfree(filter);
6997
6998         return 0;
6999 }
7000
7001 /* called with rcu_read_lock held */
7002 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
7003                                   struct sk_buff *skb,
7004                                   const struct nlmsghdr *nlh,
7005                                   const struct nlattr * const nla[],
7006                                   struct netlink_ext_ack *extack)
7007 {
7008         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7009         u8 genmask = nft_genmask_cur(net);
7010         int family = nfmsg->nfgen_family;
7011         struct nft_flowtable *flowtable;
7012         const struct nft_table *table;
7013         struct sk_buff *skb2;
7014         int err;
7015
7016         if (nlh->nlmsg_flags & NLM_F_DUMP) {
7017                 struct netlink_dump_control c = {
7018                         .start = nf_tables_dump_flowtable_start,
7019                         .dump = nf_tables_dump_flowtable,
7020                         .done = nf_tables_dump_flowtable_done,
7021                         .module = THIS_MODULE,
7022                         .data = (void *)nla,
7023                 };
7024
7025                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
7026         }
7027
7028         if (!nla[NFTA_FLOWTABLE_NAME])
7029                 return -EINVAL;
7030
7031         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7032                                  genmask);
7033         if (IS_ERR(table))
7034                 return PTR_ERR(table);
7035
7036         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7037                                          genmask);
7038         if (IS_ERR(flowtable))
7039                 return PTR_ERR(flowtable);
7040
7041         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7042         if (!skb2)
7043                 return -ENOMEM;
7044
7045         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7046                                             nlh->nlmsg_seq,
7047                                             NFT_MSG_NEWFLOWTABLE, 0, family,
7048                                             flowtable, &flowtable->hook_list);
7049         if (err < 0)
7050                 goto err_fill_flowtable_info;
7051
7052         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7053
7054 err_fill_flowtable_info:
7055         kfree_skb(skb2);
7056         return err;
7057 }
7058
7059 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7060                                        struct nft_flowtable *flowtable,
7061                                        struct list_head *hook_list,
7062                                        int event)
7063 {
7064         struct sk_buff *skb;
7065         int err;
7066         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
7067                               flowtable->table->name, flowtable->table->handle,
7068                               flowtable->name, flowtable->handle);
7069
7070         audit_log_nfcfg(buf,
7071                         ctx->family,
7072                         flowtable->hooknum,
7073                         event == NFT_MSG_NEWFLOWTABLE ?
7074                                 AUDIT_NFT_OP_FLOWTABLE_REGISTER :
7075                                 AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
7076                         GFP_KERNEL);
7077         kfree(buf);
7078
7079         if (ctx->report &&
7080             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7081                 return;
7082
7083         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7084         if (skb == NULL)
7085                 goto err;
7086
7087         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7088                                             ctx->seq, event, 0,
7089                                             ctx->family, flowtable, hook_list);
7090         if (err < 0) {
7091                 kfree_skb(skb);
7092                 goto err;
7093         }
7094
7095         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
7096         return;
7097 err:
7098         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7099 }
7100
7101 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7102 {
7103         struct nft_hook *hook, *next;
7104
7105         flowtable->data.type->free(&flowtable->data);
7106         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7107                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7108                                             FLOW_BLOCK_UNBIND);
7109                 list_del_rcu(&hook->list);
7110                 kfree(hook);
7111         }
7112         kfree(flowtable->name);
7113         module_put(flowtable->data.type->owner);
7114         kfree(flowtable);
7115 }
7116
7117 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7118                                    u32 portid, u32 seq)
7119 {
7120         struct nlmsghdr *nlh;
7121         struct nfgenmsg *nfmsg;
7122         char buf[TASK_COMM_LEN];
7123         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7124
7125         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
7126         if (nlh == NULL)
7127                 goto nla_put_failure;
7128
7129         nfmsg = nlmsg_data(nlh);
7130         nfmsg->nfgen_family     = AF_UNSPEC;
7131         nfmsg->version          = NFNETLINK_V0;
7132         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
7133
7134         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
7135             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7136             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7137                 goto nla_put_failure;
7138
7139         nlmsg_end(skb, nlh);
7140         return 0;
7141
7142 nla_put_failure:
7143         nlmsg_trim(skb, nlh);
7144         return -EMSGSIZE;
7145 }
7146
7147 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7148                                 struct nft_flowtable *flowtable)
7149 {
7150         struct nft_hook *hook;
7151
7152         list_for_each_entry(hook, &flowtable->hook_list, list) {
7153                 if (hook->ops.dev != dev)
7154                         continue;
7155
7156                 /* flow_offload_netdev_event() cleans up entries for us. */
7157                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
7158                 list_del_rcu(&hook->list);
7159                 kfree_rcu(hook, rcu);
7160                 break;
7161         }
7162 }
7163
7164 static int nf_tables_flowtable_event(struct notifier_block *this,
7165                                      unsigned long event, void *ptr)
7166 {
7167         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7168         struct nft_flowtable *flowtable;
7169         struct nft_table *table;
7170         struct net *net;
7171
7172         if (event != NETDEV_UNREGISTER)
7173                 return 0;
7174
7175         net = dev_net(dev);
7176         mutex_lock(&net->nft.commit_mutex);
7177         list_for_each_entry(table, &net->nft.tables, list) {
7178                 list_for_each_entry(flowtable, &table->flowtables, list) {
7179                         nft_flowtable_event(event, dev, flowtable);
7180                 }
7181         }
7182         mutex_unlock(&net->nft.commit_mutex);
7183
7184         return NOTIFY_DONE;
7185 }
7186
7187 static struct notifier_block nf_tables_flowtable_notifier = {
7188         .notifier_call  = nf_tables_flowtable_event,
7189 };
7190
7191 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
7192                                  int event)
7193 {
7194         struct nlmsghdr *nlh = nlmsg_hdr(skb);
7195         struct sk_buff *skb2;
7196         int err;
7197
7198         audit_log_nfcfg("?:0;?:0", 0, net->nft.base_seq,
7199                         AUDIT_NFT_OP_GEN_REGISTER, GFP_KERNEL);
7200
7201         if (nlmsg_report(nlh) &&
7202             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7203                 return;
7204
7205         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7206         if (skb2 == NULL)
7207                 goto err;
7208
7209         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7210                                       nlh->nlmsg_seq);
7211         if (err < 0) {
7212                 kfree_skb(skb2);
7213                 goto err;
7214         }
7215
7216         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7217                        nlmsg_report(nlh), GFP_KERNEL);
7218         return;
7219 err:
7220         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7221                           -ENOBUFS);
7222 }
7223
7224 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
7225                             struct sk_buff *skb, const struct nlmsghdr *nlh,
7226                             const struct nlattr * const nla[],
7227                             struct netlink_ext_ack *extack)
7228 {
7229         struct sk_buff *skb2;
7230         int err;
7231
7232         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7233         if (skb2 == NULL)
7234                 return -ENOMEM;
7235
7236         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7237                                       nlh->nlmsg_seq);
7238         if (err < 0)
7239                 goto err_fill_gen_info;
7240
7241         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7242
7243 err_fill_gen_info:
7244         kfree_skb(skb2);
7245         return err;
7246 }
7247
7248 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
7249         [NFT_MSG_NEWTABLE] = {
7250                 .call_batch     = nf_tables_newtable,
7251                 .attr_count     = NFTA_TABLE_MAX,
7252                 .policy         = nft_table_policy,
7253         },
7254         [NFT_MSG_GETTABLE] = {
7255                 .call_rcu       = nf_tables_gettable,
7256                 .attr_count     = NFTA_TABLE_MAX,
7257                 .policy         = nft_table_policy,
7258         },
7259         [NFT_MSG_DELTABLE] = {
7260                 .call_batch     = nf_tables_deltable,
7261                 .attr_count     = NFTA_TABLE_MAX,
7262                 .policy         = nft_table_policy,
7263         },
7264         [NFT_MSG_NEWCHAIN] = {
7265                 .call_batch     = nf_tables_newchain,
7266                 .attr_count     = NFTA_CHAIN_MAX,
7267                 .policy         = nft_chain_policy,
7268         },
7269         [NFT_MSG_GETCHAIN] = {
7270                 .call_rcu       = nf_tables_getchain,
7271                 .attr_count     = NFTA_CHAIN_MAX,
7272                 .policy         = nft_chain_policy,
7273         },
7274         [NFT_MSG_DELCHAIN] = {
7275                 .call_batch     = nf_tables_delchain,
7276                 .attr_count     = NFTA_CHAIN_MAX,
7277                 .policy         = nft_chain_policy,
7278         },
7279         [NFT_MSG_NEWRULE] = {
7280                 .call_batch     = nf_tables_newrule,
7281                 .attr_count     = NFTA_RULE_MAX,
7282                 .policy         = nft_rule_policy,
7283         },
7284         [NFT_MSG_GETRULE] = {
7285                 .call_rcu       = nf_tables_getrule,
7286                 .attr_count     = NFTA_RULE_MAX,
7287                 .policy         = nft_rule_policy,
7288         },
7289         [NFT_MSG_DELRULE] = {
7290                 .call_batch     = nf_tables_delrule,
7291                 .attr_count     = NFTA_RULE_MAX,
7292                 .policy         = nft_rule_policy,
7293         },
7294         [NFT_MSG_NEWSET] = {
7295                 .call_batch     = nf_tables_newset,
7296                 .attr_count     = NFTA_SET_MAX,
7297                 .policy         = nft_set_policy,
7298         },
7299         [NFT_MSG_GETSET] = {
7300                 .call_rcu       = nf_tables_getset,
7301                 .attr_count     = NFTA_SET_MAX,
7302                 .policy         = nft_set_policy,
7303         },
7304         [NFT_MSG_DELSET] = {
7305                 .call_batch     = nf_tables_delset,
7306                 .attr_count     = NFTA_SET_MAX,
7307                 .policy         = nft_set_policy,
7308         },
7309         [NFT_MSG_NEWSETELEM] = {
7310                 .call_batch     = nf_tables_newsetelem,
7311                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7312                 .policy         = nft_set_elem_list_policy,
7313         },
7314         [NFT_MSG_GETSETELEM] = {
7315                 .call_rcu       = nf_tables_getsetelem,
7316                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7317                 .policy         = nft_set_elem_list_policy,
7318         },
7319         [NFT_MSG_DELSETELEM] = {
7320                 .call_batch     = nf_tables_delsetelem,
7321                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7322                 .policy         = nft_set_elem_list_policy,
7323         },
7324         [NFT_MSG_GETGEN] = {
7325                 .call_rcu       = nf_tables_getgen,
7326         },
7327         [NFT_MSG_NEWOBJ] = {
7328                 .call_batch     = nf_tables_newobj,
7329                 .attr_count     = NFTA_OBJ_MAX,
7330                 .policy         = nft_obj_policy,
7331         },
7332         [NFT_MSG_GETOBJ] = {
7333                 .call_rcu       = nf_tables_getobj,
7334                 .attr_count     = NFTA_OBJ_MAX,
7335                 .policy         = nft_obj_policy,
7336         },
7337         [NFT_MSG_DELOBJ] = {
7338                 .call_batch     = nf_tables_delobj,
7339                 .attr_count     = NFTA_OBJ_MAX,
7340                 .policy         = nft_obj_policy,
7341         },
7342         [NFT_MSG_GETOBJ_RESET] = {
7343                 .call_rcu       = nf_tables_getobj,
7344                 .attr_count     = NFTA_OBJ_MAX,
7345                 .policy         = nft_obj_policy,
7346         },
7347         [NFT_MSG_NEWFLOWTABLE] = {
7348                 .call_batch     = nf_tables_newflowtable,
7349                 .attr_count     = NFTA_FLOWTABLE_MAX,
7350                 .policy         = nft_flowtable_policy,
7351         },
7352         [NFT_MSG_GETFLOWTABLE] = {
7353                 .call_rcu       = nf_tables_getflowtable,
7354                 .attr_count     = NFTA_FLOWTABLE_MAX,
7355                 .policy         = nft_flowtable_policy,
7356         },
7357         [NFT_MSG_DELFLOWTABLE] = {
7358                 .call_batch     = nf_tables_delflowtable,
7359                 .attr_count     = NFTA_FLOWTABLE_MAX,
7360                 .policy         = nft_flowtable_policy,
7361         },
7362 };
7363
7364 static int nf_tables_validate(struct net *net)
7365 {
7366         struct nft_table *table;
7367
7368         switch (net->nft.validate_state) {
7369         case NFT_VALIDATE_SKIP:
7370                 break;
7371         case NFT_VALIDATE_NEED:
7372                 nft_validate_state_update(net, NFT_VALIDATE_DO);
7373                 fallthrough;
7374         case NFT_VALIDATE_DO:
7375                 list_for_each_entry(table, &net->nft.tables, list) {
7376                         if (nft_table_validate(net, table) < 0)
7377                                 return -EAGAIN;
7378                 }
7379                 break;
7380         }
7381
7382         return 0;
7383 }
7384
7385 /* a drop policy has to be deferred until all rules have been activated,
7386  * otherwise a large ruleset that contains a drop-policy base chain will
7387  * cause all packets to get dropped until the full transaction has been
7388  * processed.
7389  *
7390  * We defer the drop policy until the transaction has been finalized.
7391  */
7392 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
7393 {
7394         struct nft_base_chain *basechain;
7395
7396         if (nft_trans_chain_policy(trans) != NF_DROP)
7397                 return;
7398
7399         if (!nft_is_base_chain(trans->ctx.chain))
7400                 return;
7401
7402         basechain = nft_base_chain(trans->ctx.chain);
7403         basechain->policy = NF_DROP;
7404 }
7405
7406 static void nft_chain_commit_update(struct nft_trans *trans)
7407 {
7408         struct nft_base_chain *basechain;
7409
7410         if (nft_trans_chain_name(trans)) {
7411                 rhltable_remove(&trans->ctx.table->chains_ht,
7412                                 &trans->ctx.chain->rhlhead,
7413                                 nft_chain_ht_params);
7414                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
7415                 rhltable_insert_key(&trans->ctx.table->chains_ht,
7416                                     trans->ctx.chain->name,
7417                                     &trans->ctx.chain->rhlhead,
7418                                     nft_chain_ht_params);
7419         }
7420
7421         if (!nft_is_base_chain(trans->ctx.chain))
7422                 return;
7423
7424         nft_chain_stats_replace(trans);
7425
7426         basechain = nft_base_chain(trans->ctx.chain);
7427
7428         switch (nft_trans_chain_policy(trans)) {
7429         case NF_DROP:
7430         case NF_ACCEPT:
7431                 basechain->policy = nft_trans_chain_policy(trans);
7432                 break;
7433         }
7434 }
7435
7436 static void nft_obj_commit_update(struct nft_trans *trans)
7437 {
7438         struct nft_object *newobj;
7439         struct nft_object *obj;
7440
7441         obj = nft_trans_obj(trans);
7442         newobj = nft_trans_obj_newobj(trans);
7443
7444         if (obj->ops->update)
7445                 obj->ops->update(obj, newobj);
7446
7447         kfree(newobj);
7448 }
7449
7450 static void nft_commit_release(struct nft_trans *trans)
7451 {
7452         switch (trans->msg_type) {
7453         case NFT_MSG_DELTABLE:
7454                 nf_tables_table_destroy(&trans->ctx);
7455                 break;
7456         case NFT_MSG_NEWCHAIN:
7457                 free_percpu(nft_trans_chain_stats(trans));
7458                 kfree(nft_trans_chain_name(trans));
7459                 break;
7460         case NFT_MSG_DELCHAIN:
7461                 nf_tables_chain_destroy(&trans->ctx);
7462                 break;
7463         case NFT_MSG_DELRULE:
7464                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
7465                 break;
7466         case NFT_MSG_DELSET:
7467                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
7468                 break;
7469         case NFT_MSG_DELSETELEM:
7470                 nf_tables_set_elem_destroy(&trans->ctx,
7471                                            nft_trans_elem_set(trans),
7472                                            nft_trans_elem(trans).priv);
7473                 break;
7474         case NFT_MSG_DELOBJ:
7475                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
7476                 break;
7477         case NFT_MSG_DELFLOWTABLE:
7478                 if (nft_trans_flowtable_update(trans))
7479                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
7480                 else
7481                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
7482                 break;
7483         }
7484
7485         if (trans->put_net)
7486                 put_net(trans->ctx.net);
7487
7488         kfree(trans);
7489 }
7490
7491 static void nf_tables_trans_destroy_work(struct work_struct *w)
7492 {
7493         struct nft_trans *trans, *next;
7494         LIST_HEAD(head);
7495
7496         spin_lock(&nf_tables_destroy_list_lock);
7497         list_splice_init(&nf_tables_destroy_list, &head);
7498         spin_unlock(&nf_tables_destroy_list_lock);
7499
7500         if (list_empty(&head))
7501                 return;
7502
7503         synchronize_rcu();
7504
7505         list_for_each_entry_safe(trans, next, &head, list) {
7506                 list_del(&trans->list);
7507                 nft_commit_release(trans);
7508         }
7509 }
7510
7511 void nf_tables_trans_destroy_flush_work(void)
7512 {
7513         flush_work(&trans_destroy_work);
7514 }
7515 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
7516
7517 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
7518 {
7519         struct nft_rule *rule;
7520         unsigned int alloc = 0;
7521         int i;
7522
7523         /* already handled or inactive chain? */
7524         if (chain->rules_next || !nft_is_active_next(net, chain))
7525                 return 0;
7526
7527         rule = list_entry(&chain->rules, struct nft_rule, list);
7528         i = 0;
7529
7530         list_for_each_entry_continue(rule, &chain->rules, list) {
7531                 if (nft_is_active_next(net, rule))
7532                         alloc++;
7533         }
7534
7535         chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
7536         if (!chain->rules_next)
7537                 return -ENOMEM;
7538
7539         list_for_each_entry_continue(rule, &chain->rules, list) {
7540                 if (nft_is_active_next(net, rule))
7541                         chain->rules_next[i++] = rule;
7542         }
7543
7544         chain->rules_next[i] = NULL;
7545         return 0;
7546 }
7547
7548 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
7549 {
7550         struct nft_trans *trans, *next;
7551
7552         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7553                 struct nft_chain *chain = trans->ctx.chain;
7554
7555                 if (trans->msg_type == NFT_MSG_NEWRULE ||
7556                     trans->msg_type == NFT_MSG_DELRULE) {
7557                         kvfree(chain->rules_next);
7558                         chain->rules_next = NULL;
7559                 }
7560         }
7561 }
7562
7563 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
7564 {
7565         struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
7566
7567         kvfree(o->start);
7568 }
7569
7570 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
7571 {
7572         struct nft_rule **r = rules;
7573         struct nft_rules_old *old;
7574
7575         while (*r)
7576                 r++;
7577
7578         r++;    /* rcu_head is after end marker */
7579         old = (void *) r;
7580         old->start = rules;
7581
7582         call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
7583 }
7584
7585 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
7586 {
7587         struct nft_rule **g0, **g1;
7588         bool next_genbit;
7589
7590         next_genbit = nft_gencursor_next(net);
7591
7592         g0 = rcu_dereference_protected(chain->rules_gen_0,
7593                                        lockdep_commit_lock_is_held(net));
7594         g1 = rcu_dereference_protected(chain->rules_gen_1,
7595                                        lockdep_commit_lock_is_held(net));
7596
7597         /* No changes to this chain? */
7598         if (chain->rules_next == NULL) {
7599                 /* chain had no change in last or next generation */
7600                 if (g0 == g1)
7601                         return;
7602                 /*
7603                  * chain had no change in this generation; make sure next
7604                  * one uses same rules as current generation.
7605                  */
7606                 if (next_genbit) {
7607                         rcu_assign_pointer(chain->rules_gen_1, g0);
7608                         nf_tables_commit_chain_free_rules_old(g1);
7609                 } else {
7610                         rcu_assign_pointer(chain->rules_gen_0, g1);
7611                         nf_tables_commit_chain_free_rules_old(g0);
7612                 }
7613
7614                 return;
7615         }
7616
7617         if (next_genbit)
7618                 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
7619         else
7620                 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
7621
7622         chain->rules_next = NULL;
7623
7624         if (g0 == g1)
7625                 return;
7626
7627         if (next_genbit)
7628                 nf_tables_commit_chain_free_rules_old(g1);
7629         else
7630                 nf_tables_commit_chain_free_rules_old(g0);
7631 }
7632
7633 static void nft_obj_del(struct nft_object *obj)
7634 {
7635         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
7636         list_del_rcu(&obj->list);
7637 }
7638
7639 void nft_chain_del(struct nft_chain *chain)
7640 {
7641         struct nft_table *table = chain->table;
7642
7643         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
7644                                      nft_chain_ht_params));
7645         list_del_rcu(&chain->list);
7646 }
7647
7648 static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
7649                                     struct list_head *hook_list)
7650 {
7651         struct nft_hook *hook, *next;
7652
7653         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7654                 if (hook->inactive)
7655                         list_move(&hook->list, hook_list);
7656         }
7657 }
7658
7659 static void nf_tables_module_autoload_cleanup(struct net *net)
7660 {
7661         struct nft_module_request *req, *next;
7662
7663         WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
7664         list_for_each_entry_safe(req, next, &net->nft.module_list, list) {
7665                 WARN_ON_ONCE(!req->done);
7666                 list_del(&req->list);
7667                 kfree(req);
7668         }
7669 }
7670
7671 static void nf_tables_commit_release(struct net *net)
7672 {
7673         struct nft_trans *trans;
7674
7675         /* all side effects have to be made visible.
7676          * For example, if a chain named 'foo' has been deleted, a
7677          * new transaction must not find it anymore.
7678          *
7679          * Memory reclaim happens asynchronously from work queue
7680          * to prevent expensive synchronize_rcu() in commit phase.
7681          */
7682         if (list_empty(&net->nft.commit_list)) {
7683                 nf_tables_module_autoload_cleanup(net);
7684                 mutex_unlock(&net->nft.commit_mutex);
7685                 return;
7686         }
7687
7688         trans = list_last_entry(&net->nft.commit_list,
7689                                 struct nft_trans, list);
7690         get_net(trans->ctx.net);
7691         WARN_ON_ONCE(trans->put_net);
7692
7693         trans->put_net = true;
7694         spin_lock(&nf_tables_destroy_list_lock);
7695         list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
7696         spin_unlock(&nf_tables_destroy_list_lock);
7697
7698         nf_tables_module_autoload_cleanup(net);
7699         schedule_work(&trans_destroy_work);
7700
7701         mutex_unlock(&net->nft.commit_mutex);
7702 }
7703
7704 static void nft_commit_notify(struct net *net, u32 portid)
7705 {
7706         struct sk_buff *batch_skb = NULL, *nskb, *skb;
7707         unsigned char *data;
7708         int len;
7709
7710         list_for_each_entry_safe(skb, nskb, &net->nft.notify_list, list) {
7711                 if (!batch_skb) {
7712 new_batch:
7713                         batch_skb = skb;
7714                         len = NLMSG_GOODSIZE - skb->len;
7715                         list_del(&skb->list);
7716                         continue;
7717                 }
7718                 len -= skb->len;
7719                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
7720                         data = skb_put(batch_skb, skb->len);
7721                         memcpy(data, skb->data, skb->len);
7722                         list_del(&skb->list);
7723                         kfree_skb(skb);
7724                         continue;
7725                 }
7726                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
7727                                NFT_CB(batch_skb).report, GFP_KERNEL);
7728                 goto new_batch;
7729         }
7730
7731         if (batch_skb) {
7732                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
7733                                NFT_CB(batch_skb).report, GFP_KERNEL);
7734         }
7735
7736         WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
7737 }
7738
7739 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
7740 {
7741         struct nft_trans *trans, *next;
7742         struct nft_trans_elem *te;
7743         struct nft_chain *chain;
7744         struct nft_table *table;
7745         int err;
7746
7747         if (list_empty(&net->nft.commit_list)) {
7748                 mutex_unlock(&net->nft.commit_mutex);
7749                 return 0;
7750         }
7751
7752         /* 0. Validate ruleset, otherwise roll back for error reporting. */
7753         if (nf_tables_validate(net) < 0)
7754                 return -EAGAIN;
7755
7756         err = nft_flow_rule_offload_commit(net);
7757         if (err < 0)
7758                 return err;
7759
7760         /* 1.  Allocate space for next generation rules_gen_X[] */
7761         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7762                 int ret;
7763
7764                 if (trans->msg_type == NFT_MSG_NEWRULE ||
7765                     trans->msg_type == NFT_MSG_DELRULE) {
7766                         chain = trans->ctx.chain;
7767
7768                         ret = nf_tables_commit_chain_prepare(net, chain);
7769                         if (ret < 0) {
7770                                 nf_tables_commit_chain_prepare_cancel(net);
7771                                 return ret;
7772                         }
7773                 }
7774         }
7775
7776         /* step 2.  Make rules_gen_X visible to packet path */
7777         list_for_each_entry(table, &net->nft.tables, list) {
7778                 list_for_each_entry(chain, &table->chains, list)
7779                         nf_tables_commit_chain(net, chain);
7780         }
7781
7782         /*
7783          * Bump generation counter, invalidate any dump in progress.
7784          * Cannot fail after this point.
7785          */
7786         while (++net->nft.base_seq == 0);
7787
7788         /* step 3. Start new generation, rules_gen_X now in use. */
7789         net->nft.gencursor = nft_gencursor_next(net);
7790
7791         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7792                 switch (trans->msg_type) {
7793                 case NFT_MSG_NEWTABLE:
7794                         if (nft_trans_table_update(trans)) {
7795                                 if (!nft_trans_table_enable(trans)) {
7796                                         nf_tables_table_disable(net,
7797                                                                 trans->ctx.table);
7798                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
7799                                 }
7800                         } else {
7801                                 nft_clear(net, trans->ctx.table);
7802                         }
7803                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
7804                         nft_trans_destroy(trans);
7805                         break;
7806                 case NFT_MSG_DELTABLE:
7807                         list_del_rcu(&trans->ctx.table->list);
7808                         nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
7809                         break;
7810                 case NFT_MSG_NEWCHAIN:
7811                         if (nft_trans_chain_update(trans)) {
7812                                 nft_chain_commit_update(trans);
7813                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
7814                                 /* trans destroyed after rcu grace period */
7815                         } else {
7816                                 nft_chain_commit_drop_policy(trans);
7817                                 nft_clear(net, trans->ctx.chain);
7818                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
7819                                 nft_trans_destroy(trans);
7820                         }
7821                         break;
7822                 case NFT_MSG_DELCHAIN:
7823                         nft_chain_del(trans->ctx.chain);
7824                         nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
7825                         nf_tables_unregister_hook(trans->ctx.net,
7826                                                   trans->ctx.table,
7827                                                   trans->ctx.chain);
7828                         break;
7829                 case NFT_MSG_NEWRULE:
7830                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
7831                         nf_tables_rule_notify(&trans->ctx,
7832                                               nft_trans_rule(trans),
7833                                               NFT_MSG_NEWRULE);
7834                         nft_trans_destroy(trans);
7835                         break;
7836                 case NFT_MSG_DELRULE:
7837                         list_del_rcu(&nft_trans_rule(trans)->list);
7838                         nf_tables_rule_notify(&trans->ctx,
7839                                               nft_trans_rule(trans),
7840                                               NFT_MSG_DELRULE);
7841                         nft_rule_expr_deactivate(&trans->ctx,
7842                                                  nft_trans_rule(trans),
7843                                                  NFT_TRANS_COMMIT);
7844                         break;
7845                 case NFT_MSG_NEWSET:
7846                         nft_clear(net, nft_trans_set(trans));
7847                         /* This avoids hitting -EBUSY when deleting the table
7848                          * from the transaction.
7849                          */
7850                         if (nft_set_is_anonymous(nft_trans_set(trans)) &&
7851                             !list_empty(&nft_trans_set(trans)->bindings))
7852                                 trans->ctx.table->use--;
7853
7854                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
7855                                              NFT_MSG_NEWSET, GFP_KERNEL);
7856                         nft_trans_destroy(trans);
7857                         break;
7858                 case NFT_MSG_DELSET:
7859                         list_del_rcu(&nft_trans_set(trans)->list);
7860                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
7861                                              NFT_MSG_DELSET, GFP_KERNEL);
7862                         break;
7863                 case NFT_MSG_NEWSETELEM:
7864                         te = (struct nft_trans_elem *)trans->data;
7865
7866                         te->set->ops->activate(net, te->set, &te->elem);
7867                         nf_tables_setelem_notify(&trans->ctx, te->set,
7868                                                  &te->elem,
7869                                                  NFT_MSG_NEWSETELEM, 0);
7870                         nft_trans_destroy(trans);
7871                         break;
7872                 case NFT_MSG_DELSETELEM:
7873                         te = (struct nft_trans_elem *)trans->data;
7874
7875                         nf_tables_setelem_notify(&trans->ctx, te->set,
7876                                                  &te->elem,
7877                                                  NFT_MSG_DELSETELEM, 0);
7878                         te->set->ops->remove(net, te->set, &te->elem);
7879                         atomic_dec(&te->set->nelems);
7880                         te->set->ndeact--;
7881                         break;
7882                 case NFT_MSG_NEWOBJ:
7883                         if (nft_trans_obj_update(trans)) {
7884                                 nft_obj_commit_update(trans);
7885                                 nf_tables_obj_notify(&trans->ctx,
7886                                                      nft_trans_obj(trans),
7887                                                      NFT_MSG_NEWOBJ);
7888                         } else {
7889                                 nft_clear(net, nft_trans_obj(trans));
7890                                 nf_tables_obj_notify(&trans->ctx,
7891                                                      nft_trans_obj(trans),
7892                                                      NFT_MSG_NEWOBJ);
7893                                 nft_trans_destroy(trans);
7894                         }
7895                         break;
7896                 case NFT_MSG_DELOBJ:
7897                         nft_obj_del(nft_trans_obj(trans));
7898                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
7899                                              NFT_MSG_DELOBJ);
7900                         break;
7901                 case NFT_MSG_NEWFLOWTABLE:
7902                         if (nft_trans_flowtable_update(trans)) {
7903                                 nf_tables_flowtable_notify(&trans->ctx,
7904                                                            nft_trans_flowtable(trans),
7905                                                            &nft_trans_flowtable_hooks(trans),
7906                                                            NFT_MSG_NEWFLOWTABLE);
7907                                 list_splice(&nft_trans_flowtable_hooks(trans),
7908                                             &nft_trans_flowtable(trans)->hook_list);
7909                         } else {
7910                                 nft_clear(net, nft_trans_flowtable(trans));
7911                                 nf_tables_flowtable_notify(&trans->ctx,
7912                                                            nft_trans_flowtable(trans),
7913                                                            &nft_trans_flowtable(trans)->hook_list,
7914                                                            NFT_MSG_NEWFLOWTABLE);
7915                         }
7916                         nft_trans_destroy(trans);
7917                         break;
7918                 case NFT_MSG_DELFLOWTABLE:
7919                         if (nft_trans_flowtable_update(trans)) {
7920                                 nft_flowtable_hooks_del(nft_trans_flowtable(trans),
7921                                                         &nft_trans_flowtable_hooks(trans));
7922                                 nf_tables_flowtable_notify(&trans->ctx,
7923                                                            nft_trans_flowtable(trans),
7924                                                            &nft_trans_flowtable_hooks(trans),
7925                                                            NFT_MSG_DELFLOWTABLE);
7926                                 nft_unregister_flowtable_net_hooks(net,
7927                                                                    &nft_trans_flowtable_hooks(trans));
7928                         } else {
7929                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
7930                                 nf_tables_flowtable_notify(&trans->ctx,
7931                                                            nft_trans_flowtable(trans),
7932                                                            &nft_trans_flowtable(trans)->hook_list,
7933                                                            NFT_MSG_DELFLOWTABLE);
7934                                 nft_unregister_flowtable_net_hooks(net,
7935                                                 &nft_trans_flowtable(trans)->hook_list);
7936                         }
7937                         break;
7938                 }
7939         }
7940
7941         nft_commit_notify(net, NETLINK_CB(skb).portid);
7942         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
7943         nf_tables_commit_release(net);
7944
7945         return 0;
7946 }
7947
7948 static void nf_tables_module_autoload(struct net *net)
7949 {
7950         struct nft_module_request *req, *next;
7951         LIST_HEAD(module_list);
7952
7953         list_splice_init(&net->nft.module_list, &module_list);
7954         mutex_unlock(&net->nft.commit_mutex);
7955         list_for_each_entry_safe(req, next, &module_list, list) {
7956                 request_module("%s", req->module);
7957                 req->done = true;
7958         }
7959         mutex_lock(&net->nft.commit_mutex);
7960         list_splice(&module_list, &net->nft.module_list);
7961 }
7962
7963 static void nf_tables_abort_release(struct nft_trans *trans)
7964 {
7965         switch (trans->msg_type) {
7966         case NFT_MSG_NEWTABLE:
7967                 nf_tables_table_destroy(&trans->ctx);
7968                 break;
7969         case NFT_MSG_NEWCHAIN:
7970                 nf_tables_chain_destroy(&trans->ctx);
7971                 break;
7972         case NFT_MSG_NEWRULE:
7973                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
7974                 break;
7975         case NFT_MSG_NEWSET:
7976                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
7977                 break;
7978         case NFT_MSG_NEWSETELEM:
7979                 nft_set_elem_destroy(nft_trans_elem_set(trans),
7980                                      nft_trans_elem(trans).priv, true);
7981                 break;
7982         case NFT_MSG_NEWOBJ:
7983                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
7984                 break;
7985         case NFT_MSG_NEWFLOWTABLE:
7986                 if (nft_trans_flowtable_update(trans))
7987                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
7988                 else
7989                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
7990                 break;
7991         }
7992         kfree(trans);
7993 }
7994
7995 static int __nf_tables_abort(struct net *net, bool autoload)
7996 {
7997         struct nft_trans *trans, *next;
7998         struct nft_trans_elem *te;
7999         struct nft_hook *hook;
8000
8001         list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
8002                                          list) {
8003                 switch (trans->msg_type) {
8004                 case NFT_MSG_NEWTABLE:
8005                         if (nft_trans_table_update(trans)) {
8006                                 if (nft_trans_table_enable(trans)) {
8007                                         nf_tables_table_disable(net,
8008                                                                 trans->ctx.table);
8009                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8010                                 }
8011                                 nft_trans_destroy(trans);
8012                         } else {
8013                                 list_del_rcu(&trans->ctx.table->list);
8014                         }
8015                         break;
8016                 case NFT_MSG_DELTABLE:
8017                         nft_clear(trans->ctx.net, trans->ctx.table);
8018                         nft_trans_destroy(trans);
8019                         break;
8020                 case NFT_MSG_NEWCHAIN:
8021                         if (nft_trans_chain_update(trans)) {
8022                                 free_percpu(nft_trans_chain_stats(trans));
8023                                 kfree(nft_trans_chain_name(trans));
8024                                 nft_trans_destroy(trans);
8025                         } else {
8026                                 if (nft_chain_is_bound(trans->ctx.chain)) {
8027                                         nft_trans_destroy(trans);
8028                                         break;
8029                                 }
8030                                 trans->ctx.table->use--;
8031                                 nft_chain_del(trans->ctx.chain);
8032                                 nf_tables_unregister_hook(trans->ctx.net,
8033                                                           trans->ctx.table,
8034                                                           trans->ctx.chain);
8035                         }
8036                         break;
8037                 case NFT_MSG_DELCHAIN:
8038                         trans->ctx.table->use++;
8039                         nft_clear(trans->ctx.net, trans->ctx.chain);
8040                         nft_trans_destroy(trans);
8041                         break;
8042                 case NFT_MSG_NEWRULE:
8043                         trans->ctx.chain->use--;
8044                         list_del_rcu(&nft_trans_rule(trans)->list);
8045                         nft_rule_expr_deactivate(&trans->ctx,
8046                                                  nft_trans_rule(trans),
8047                                                  NFT_TRANS_ABORT);
8048                         break;
8049                 case NFT_MSG_DELRULE:
8050                         trans->ctx.chain->use++;
8051                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8052                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
8053                         nft_trans_destroy(trans);
8054                         break;
8055                 case NFT_MSG_NEWSET:
8056                         trans->ctx.table->use--;
8057                         if (nft_trans_set_bound(trans)) {
8058                                 nft_trans_destroy(trans);
8059                                 break;
8060                         }
8061                         list_del_rcu(&nft_trans_set(trans)->list);
8062                         break;
8063                 case NFT_MSG_DELSET:
8064                         trans->ctx.table->use++;
8065                         nft_clear(trans->ctx.net, nft_trans_set(trans));
8066                         nft_trans_destroy(trans);
8067                         break;
8068                 case NFT_MSG_NEWSETELEM:
8069                         if (nft_trans_elem_set_bound(trans)) {
8070                                 nft_trans_destroy(trans);
8071                                 break;
8072                         }
8073                         te = (struct nft_trans_elem *)trans->data;
8074                         te->set->ops->remove(net, te->set, &te->elem);
8075                         atomic_dec(&te->set->nelems);
8076                         break;
8077                 case NFT_MSG_DELSETELEM:
8078                         te = (struct nft_trans_elem *)trans->data;
8079
8080                         nft_set_elem_activate(net, te->set, &te->elem);
8081                         te->set->ops->activate(net, te->set, &te->elem);
8082                         te->set->ndeact--;
8083
8084                         nft_trans_destroy(trans);
8085                         break;
8086                 case NFT_MSG_NEWOBJ:
8087                         if (nft_trans_obj_update(trans)) {
8088                                 kfree(nft_trans_obj_newobj(trans));
8089                                 nft_trans_destroy(trans);
8090                         } else {
8091                                 trans->ctx.table->use--;
8092                                 nft_obj_del(nft_trans_obj(trans));
8093                         }
8094                         break;
8095                 case NFT_MSG_DELOBJ:
8096                         trans->ctx.table->use++;
8097                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
8098                         nft_trans_destroy(trans);
8099                         break;
8100                 case NFT_MSG_NEWFLOWTABLE:
8101                         if (nft_trans_flowtable_update(trans)) {
8102                                 nft_unregister_flowtable_net_hooks(net,
8103                                                 &nft_trans_flowtable_hooks(trans));
8104                         } else {
8105                                 trans->ctx.table->use--;
8106                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8107                                 nft_unregister_flowtable_net_hooks(net,
8108                                                 &nft_trans_flowtable(trans)->hook_list);
8109                         }
8110                         break;
8111                 case NFT_MSG_DELFLOWTABLE:
8112                         if (nft_trans_flowtable_update(trans)) {
8113                                 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
8114                                         hook->inactive = false;
8115                         } else {
8116                                 trans->ctx.table->use++;
8117                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
8118                         }
8119                         nft_trans_destroy(trans);
8120                         break;
8121                 }
8122         }
8123
8124         synchronize_rcu();
8125
8126         list_for_each_entry_safe_reverse(trans, next,
8127                                          &net->nft.commit_list, list) {
8128                 list_del(&trans->list);
8129                 nf_tables_abort_release(trans);
8130         }
8131
8132         if (autoload)
8133                 nf_tables_module_autoload(net);
8134         else
8135                 nf_tables_module_autoload_cleanup(net);
8136
8137         return 0;
8138 }
8139
8140 static void nf_tables_cleanup(struct net *net)
8141 {
8142         nft_validate_state_update(net, NFT_VALIDATE_SKIP);
8143 }
8144
8145 static int nf_tables_abort(struct net *net, struct sk_buff *skb, bool autoload)
8146 {
8147         int ret = __nf_tables_abort(net, autoload);
8148
8149         mutex_unlock(&net->nft.commit_mutex);
8150
8151         return ret;
8152 }
8153
8154 static bool nf_tables_valid_genid(struct net *net, u32 genid)
8155 {
8156         bool genid_ok;
8157
8158         mutex_lock(&net->nft.commit_mutex);
8159
8160         genid_ok = genid == 0 || net->nft.base_seq == genid;
8161         if (!genid_ok)
8162                 mutex_unlock(&net->nft.commit_mutex);
8163
8164         /* else, commit mutex has to be released by commit or abort function */
8165         return genid_ok;
8166 }
8167
8168 static const struct nfnetlink_subsystem nf_tables_subsys = {
8169         .name           = "nf_tables",
8170         .subsys_id      = NFNL_SUBSYS_NFTABLES,
8171         .cb_count       = NFT_MSG_MAX,
8172         .cb             = nf_tables_cb,
8173         .commit         = nf_tables_commit,
8174         .abort          = nf_tables_abort,
8175         .cleanup        = nf_tables_cleanup,
8176         .valid_genid    = nf_tables_valid_genid,
8177         .owner          = THIS_MODULE,
8178 };
8179
8180 int nft_chain_validate_dependency(const struct nft_chain *chain,
8181                                   enum nft_chain_types type)
8182 {
8183         const struct nft_base_chain *basechain;
8184
8185         if (nft_is_base_chain(chain)) {
8186                 basechain = nft_base_chain(chain);
8187                 if (basechain->type->type != type)
8188                         return -EOPNOTSUPP;
8189         }
8190         return 0;
8191 }
8192 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
8193
8194 int nft_chain_validate_hooks(const struct nft_chain *chain,
8195                              unsigned int hook_flags)
8196 {
8197         struct nft_base_chain *basechain;
8198
8199         if (nft_is_base_chain(chain)) {
8200                 basechain = nft_base_chain(chain);
8201
8202                 if ((1 << basechain->ops.hooknum) & hook_flags)
8203                         return 0;
8204
8205                 return -EOPNOTSUPP;
8206         }
8207
8208         return 0;
8209 }
8210 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
8211
8212 /*
8213  * Loop detection - walk through the ruleset beginning at the destination chain
8214  * of a new jump until either the source chain is reached (loop) or all
8215  * reachable chains have been traversed.
8216  *
8217  * The loop check is performed whenever a new jump verdict is added to an
8218  * expression or verdict map or a verdict map is bound to a new chain.
8219  */
8220
8221 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8222                                  const struct nft_chain *chain);
8223
8224 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
8225                                         struct nft_set *set,
8226                                         const struct nft_set_iter *iter,
8227                                         struct nft_set_elem *elem)
8228 {
8229         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
8230         const struct nft_data *data;
8231
8232         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
8233             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
8234                 return 0;
8235
8236         data = nft_set_ext_data(ext);
8237         switch (data->verdict.code) {
8238         case NFT_JUMP:
8239         case NFT_GOTO:
8240                 return nf_tables_check_loops(ctx, data->verdict.chain);
8241         default:
8242                 return 0;
8243         }
8244 }
8245
8246 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8247                                  const struct nft_chain *chain)
8248 {
8249         const struct nft_rule *rule;
8250         const struct nft_expr *expr, *last;
8251         struct nft_set *set;
8252         struct nft_set_binding *binding;
8253         struct nft_set_iter iter;
8254
8255         if (ctx->chain == chain)
8256                 return -ELOOP;
8257
8258         list_for_each_entry(rule, &chain->rules, list) {
8259                 nft_rule_for_each_expr(expr, last, rule) {
8260                         struct nft_immediate_expr *priv;
8261                         const struct nft_data *data;
8262                         int err;
8263
8264                         if (strcmp(expr->ops->type->name, "immediate"))
8265                                 continue;
8266
8267                         priv = nft_expr_priv(expr);
8268                         if (priv->dreg != NFT_REG_VERDICT)
8269                                 continue;
8270
8271                         data = &priv->data;
8272                         switch (data->verdict.code) {
8273                         case NFT_JUMP:
8274                         case NFT_GOTO:
8275                                 err = nf_tables_check_loops(ctx,
8276                                                         data->verdict.chain);
8277                                 if (err < 0)
8278                                         return err;
8279                         default:
8280                                 break;
8281                         }
8282                 }
8283         }
8284
8285         list_for_each_entry(set, &ctx->table->sets, list) {
8286                 if (!nft_is_active_next(ctx->net, set))
8287                         continue;
8288                 if (!(set->flags & NFT_SET_MAP) ||
8289                     set->dtype != NFT_DATA_VERDICT)
8290                         continue;
8291
8292                 list_for_each_entry(binding, &set->bindings, list) {
8293                         if (!(binding->flags & NFT_SET_MAP) ||
8294                             binding->chain != chain)
8295                                 continue;
8296
8297                         iter.genmask    = nft_genmask_next(ctx->net);
8298                         iter.skip       = 0;
8299                         iter.count      = 0;
8300                         iter.err        = 0;
8301                         iter.fn         = nf_tables_loop_check_setelem;
8302
8303                         set->ops->walk(ctx, set, &iter);
8304                         if (iter.err < 0)
8305                                 return iter.err;
8306                 }
8307         }
8308
8309         return 0;
8310 }
8311
8312 /**
8313  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
8314  *
8315  *      @attr: netlink attribute to fetch value from
8316  *      @max: maximum value to be stored in dest
8317  *      @dest: pointer to the variable
8318  *
8319  *      Parse, check and store a given u32 netlink attribute into variable.
8320  *      This function returns -ERANGE if the value goes over maximum value.
8321  *      Otherwise a 0 is returned and the attribute value is stored in the
8322  *      destination variable.
8323  */
8324 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
8325 {
8326         u32 val;
8327
8328         val = ntohl(nla_get_be32(attr));
8329         if (val > max)
8330                 return -ERANGE;
8331
8332         *dest = val;
8333         return 0;
8334 }
8335 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
8336
8337 /**
8338  *      nft_parse_register - parse a register value from a netlink attribute
8339  *
8340  *      @attr: netlink attribute
8341  *
8342  *      Parse and translate a register value from a netlink attribute.
8343  *      Registers used to be 128 bit wide, these register numbers will be
8344  *      mapped to the corresponding 32 bit register numbers.
8345  */
8346 unsigned int nft_parse_register(const struct nlattr *attr)
8347 {
8348         unsigned int reg;
8349
8350         reg = ntohl(nla_get_be32(attr));
8351         switch (reg) {
8352         case NFT_REG_VERDICT...NFT_REG_4:
8353                 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
8354         default:
8355                 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
8356         }
8357 }
8358 EXPORT_SYMBOL_GPL(nft_parse_register);
8359
8360 /**
8361  *      nft_dump_register - dump a register value to a netlink attribute
8362  *
8363  *      @skb: socket buffer
8364  *      @attr: attribute number
8365  *      @reg: register number
8366  *
8367  *      Construct a netlink attribute containing the register number. For
8368  *      compatibility reasons, register numbers being a multiple of 4 are
8369  *      translated to the corresponding 128 bit register numbers.
8370  */
8371 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
8372 {
8373         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
8374                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
8375         else
8376                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
8377
8378         return nla_put_be32(skb, attr, htonl(reg));
8379 }
8380 EXPORT_SYMBOL_GPL(nft_dump_register);
8381
8382 /**
8383  *      nft_validate_register_load - validate a load from a register
8384  *
8385  *      @reg: the register number
8386  *      @len: the length of the data
8387  *
8388  *      Validate that the input register is one of the general purpose
8389  *      registers and that the length of the load is within the bounds.
8390  */
8391 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
8392 {
8393         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8394                 return -EINVAL;
8395         if (len == 0)
8396                 return -EINVAL;
8397         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
8398                 return -ERANGE;
8399
8400         return 0;
8401 }
8402 EXPORT_SYMBOL_GPL(nft_validate_register_load);
8403
8404 /**
8405  *      nft_validate_register_store - validate an expressions' register store
8406  *
8407  *      @ctx: context of the expression performing the load
8408  *      @reg: the destination register number
8409  *      @data: the data to load
8410  *      @type: the data type
8411  *      @len: the length of the data
8412  *
8413  *      Validate that a data load uses the appropriate data type for
8414  *      the destination register and the length is within the bounds.
8415  *      A value of NULL for the data means that its runtime gathered
8416  *      data.
8417  */
8418 int nft_validate_register_store(const struct nft_ctx *ctx,
8419                                 enum nft_registers reg,
8420                                 const struct nft_data *data,
8421                                 enum nft_data_types type, unsigned int len)
8422 {
8423         int err;
8424
8425         switch (reg) {
8426         case NFT_REG_VERDICT:
8427                 if (type != NFT_DATA_VERDICT)
8428                         return -EINVAL;
8429
8430                 if (data != NULL &&
8431                     (data->verdict.code == NFT_GOTO ||
8432                      data->verdict.code == NFT_JUMP)) {
8433                         err = nf_tables_check_loops(ctx, data->verdict.chain);
8434                         if (err < 0)
8435                                 return err;
8436                 }
8437
8438                 return 0;
8439         default:
8440                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8441                         return -EINVAL;
8442                 if (len == 0)
8443                         return -EINVAL;
8444                 if (reg * NFT_REG32_SIZE + len >
8445                     sizeof_field(struct nft_regs, data))
8446                         return -ERANGE;
8447
8448                 if (data != NULL && type != NFT_DATA_VALUE)
8449                         return -EINVAL;
8450                 return 0;
8451         }
8452 }
8453 EXPORT_SYMBOL_GPL(nft_validate_register_store);
8454
8455 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
8456         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
8457         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
8458                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
8459         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
8460 };
8461
8462 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
8463                             struct nft_data_desc *desc, const struct nlattr *nla)
8464 {
8465         u8 genmask = nft_genmask_next(ctx->net);
8466         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
8467         struct nft_chain *chain;
8468         int err;
8469
8470         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
8471                                           nft_verdict_policy, NULL);
8472         if (err < 0)
8473                 return err;
8474
8475         if (!tb[NFTA_VERDICT_CODE])
8476                 return -EINVAL;
8477         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
8478
8479         switch (data->verdict.code) {
8480         default:
8481                 switch (data->verdict.code & NF_VERDICT_MASK) {
8482                 case NF_ACCEPT:
8483                 case NF_DROP:
8484                 case NF_QUEUE:
8485                         break;
8486                 default:
8487                         return -EINVAL;
8488                 }
8489                 fallthrough;
8490         case NFT_CONTINUE:
8491         case NFT_BREAK:
8492         case NFT_RETURN:
8493                 break;
8494         case NFT_JUMP:
8495         case NFT_GOTO:
8496                 if (tb[NFTA_VERDICT_CHAIN]) {
8497                         chain = nft_chain_lookup(ctx->net, ctx->table,
8498                                                  tb[NFTA_VERDICT_CHAIN],
8499                                                  genmask);
8500                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
8501                         chain = nft_chain_lookup_byid(ctx->net,
8502                                                       tb[NFTA_VERDICT_CHAIN_ID]);
8503                         if (IS_ERR(chain))
8504                                 return PTR_ERR(chain);
8505                 } else {
8506                         return -EINVAL;
8507                 }
8508
8509                 if (IS_ERR(chain))
8510                         return PTR_ERR(chain);
8511                 if (nft_is_base_chain(chain))
8512                         return -EOPNOTSUPP;
8513
8514                 chain->use++;
8515                 data->verdict.chain = chain;
8516                 break;
8517         }
8518
8519         desc->len = sizeof(data->verdict);
8520         desc->type = NFT_DATA_VERDICT;
8521         return 0;
8522 }
8523
8524 static void nft_verdict_uninit(const struct nft_data *data)
8525 {
8526         struct nft_chain *chain;
8527         struct nft_rule *rule;
8528
8529         switch (data->verdict.code) {
8530         case NFT_JUMP:
8531         case NFT_GOTO:
8532                 chain = data->verdict.chain;
8533                 chain->use--;
8534
8535                 if (!nft_chain_is_bound(chain))
8536                         break;
8537
8538                 chain->table->use--;
8539                 list_for_each_entry(rule, &chain->rules, list)
8540                         chain->use--;
8541
8542                 nft_chain_del(chain);
8543                 break;
8544         }
8545 }
8546
8547 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
8548 {
8549         struct nlattr *nest;
8550
8551         nest = nla_nest_start_noflag(skb, type);
8552         if (!nest)
8553                 goto nla_put_failure;
8554
8555         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
8556                 goto nla_put_failure;
8557
8558         switch (v->code) {
8559         case NFT_JUMP:
8560         case NFT_GOTO:
8561                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
8562                                    v->chain->name))
8563                         goto nla_put_failure;
8564         }
8565         nla_nest_end(skb, nest);
8566         return 0;
8567
8568 nla_put_failure:
8569         return -1;
8570 }
8571
8572 static int nft_value_init(const struct nft_ctx *ctx,
8573                           struct nft_data *data, unsigned int size,
8574                           struct nft_data_desc *desc, const struct nlattr *nla)
8575 {
8576         unsigned int len;
8577
8578         len = nla_len(nla);
8579         if (len == 0)
8580                 return -EINVAL;
8581         if (len > size)
8582                 return -EOVERFLOW;
8583
8584         nla_memcpy(data->data, nla, len);
8585         desc->type = NFT_DATA_VALUE;
8586         desc->len  = len;
8587         return 0;
8588 }
8589
8590 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
8591                           unsigned int len)
8592 {
8593         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
8594 }
8595
8596 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
8597         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
8598         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
8599 };
8600
8601 /**
8602  *      nft_data_init - parse nf_tables data netlink attributes
8603  *
8604  *      @ctx: context of the expression using the data
8605  *      @data: destination struct nft_data
8606  *      @size: maximum data length
8607  *      @desc: data description
8608  *      @nla: netlink attribute containing data
8609  *
8610  *      Parse the netlink data attributes and initialize a struct nft_data.
8611  *      The type and length of data are returned in the data description.
8612  *
8613  *      The caller can indicate that it only wants to accept data of type
8614  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
8615  */
8616 int nft_data_init(const struct nft_ctx *ctx,
8617                   struct nft_data *data, unsigned int size,
8618                   struct nft_data_desc *desc, const struct nlattr *nla)
8619 {
8620         struct nlattr *tb[NFTA_DATA_MAX + 1];
8621         int err;
8622
8623         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
8624                                           nft_data_policy, NULL);
8625         if (err < 0)
8626                 return err;
8627
8628         if (tb[NFTA_DATA_VALUE])
8629                 return nft_value_init(ctx, data, size, desc,
8630                                       tb[NFTA_DATA_VALUE]);
8631         if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
8632                 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
8633         return -EINVAL;
8634 }
8635 EXPORT_SYMBOL_GPL(nft_data_init);
8636
8637 /**
8638  *      nft_data_release - release a nft_data item
8639  *
8640  *      @data: struct nft_data to release
8641  *      @type: type of data
8642  *
8643  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
8644  *      all others need to be released by calling this function.
8645  */
8646 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
8647 {
8648         if (type < NFT_DATA_VERDICT)
8649                 return;
8650         switch (type) {
8651         case NFT_DATA_VERDICT:
8652                 return nft_verdict_uninit(data);
8653         default:
8654                 WARN_ON(1);
8655         }
8656 }
8657 EXPORT_SYMBOL_GPL(nft_data_release);
8658
8659 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
8660                   enum nft_data_types type, unsigned int len)
8661 {
8662         struct nlattr *nest;
8663         int err;
8664
8665         nest = nla_nest_start_noflag(skb, attr);
8666         if (nest == NULL)
8667                 return -1;
8668
8669         switch (type) {
8670         case NFT_DATA_VALUE:
8671                 err = nft_value_dump(skb, data, len);
8672                 break;
8673         case NFT_DATA_VERDICT:
8674                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
8675                 break;
8676         default:
8677                 err = -EINVAL;
8678                 WARN_ON(1);
8679         }
8680
8681         nla_nest_end(skb, nest);
8682         return err;
8683 }
8684 EXPORT_SYMBOL_GPL(nft_data_dump);
8685
8686 int __nft_release_basechain(struct nft_ctx *ctx)
8687 {
8688         struct nft_rule *rule, *nr;
8689
8690         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
8691                 return 0;
8692
8693         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
8694         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
8695                 list_del(&rule->list);
8696                 ctx->chain->use--;
8697                 nf_tables_rule_release(ctx, rule);
8698         }
8699         nft_chain_del(ctx->chain);
8700         ctx->table->use--;
8701         nf_tables_chain_destroy(ctx);
8702
8703         return 0;
8704 }
8705 EXPORT_SYMBOL_GPL(__nft_release_basechain);
8706
8707 static void __nft_release_tables(struct net *net)
8708 {
8709         struct nft_flowtable *flowtable, *nf;
8710         struct nft_table *table, *nt;
8711         struct nft_chain *chain, *nc;
8712         struct nft_object *obj, *ne;
8713         struct nft_rule *rule, *nr;
8714         struct nft_set *set, *ns;
8715         struct nft_ctx ctx = {
8716                 .net    = net,
8717                 .family = NFPROTO_NETDEV,
8718         };
8719
8720         list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
8721                 ctx.family = table->family;
8722
8723                 list_for_each_entry(chain, &table->chains, list)
8724                         nf_tables_unregister_hook(net, table, chain);
8725                 /* No packets are walking on these chains anymore. */
8726                 ctx.table = table;
8727                 list_for_each_entry(chain, &table->chains, list) {
8728                         ctx.chain = chain;
8729                         list_for_each_entry_safe(rule, nr, &chain->rules, list) {
8730                                 list_del(&rule->list);
8731                                 chain->use--;
8732                                 nf_tables_rule_release(&ctx, rule);
8733                         }
8734                 }
8735                 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
8736                         list_del(&flowtable->list);
8737                         table->use--;
8738                         nf_tables_flowtable_destroy(flowtable);
8739                 }
8740                 list_for_each_entry_safe(set, ns, &table->sets, list) {
8741                         list_del(&set->list);
8742                         table->use--;
8743                         nft_set_destroy(&ctx, set);
8744                 }
8745                 list_for_each_entry_safe(obj, ne, &table->objects, list) {
8746                         nft_obj_del(obj);
8747                         table->use--;
8748                         nft_obj_destroy(&ctx, obj);
8749                 }
8750                 list_for_each_entry_safe(chain, nc, &table->chains, list) {
8751                         ctx.chain = chain;
8752                         nft_chain_del(chain);
8753                         table->use--;
8754                         nf_tables_chain_destroy(&ctx);
8755                 }
8756                 list_del(&table->list);
8757                 nf_tables_table_destroy(&ctx);
8758         }
8759 }
8760
8761 static int __net_init nf_tables_init_net(struct net *net)
8762 {
8763         INIT_LIST_HEAD(&net->nft.tables);
8764         INIT_LIST_HEAD(&net->nft.commit_list);
8765         INIT_LIST_HEAD(&net->nft.module_list);
8766         INIT_LIST_HEAD(&net->nft.notify_list);
8767         mutex_init(&net->nft.commit_mutex);
8768         net->nft.base_seq = 1;
8769         net->nft.validate_state = NFT_VALIDATE_SKIP;
8770
8771         return 0;
8772 }
8773
8774 static void __net_exit nf_tables_exit_net(struct net *net)
8775 {
8776         mutex_lock(&net->nft.commit_mutex);
8777         if (!list_empty(&net->nft.commit_list))
8778                 __nf_tables_abort(net, false);
8779         __nft_release_tables(net);
8780         mutex_unlock(&net->nft.commit_mutex);
8781         WARN_ON_ONCE(!list_empty(&net->nft.tables));
8782         WARN_ON_ONCE(!list_empty(&net->nft.module_list));
8783         WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
8784 }
8785
8786 static struct pernet_operations nf_tables_net_ops = {
8787         .init   = nf_tables_init_net,
8788         .exit   = nf_tables_exit_net,
8789 };
8790
8791 static int __init nf_tables_module_init(void)
8792 {
8793         int err;
8794
8795         spin_lock_init(&nf_tables_destroy_list_lock);
8796         err = register_pernet_subsys(&nf_tables_net_ops);
8797         if (err < 0)
8798                 return err;
8799
8800         err = nft_chain_filter_init();
8801         if (err < 0)
8802                 goto err1;
8803
8804         err = nf_tables_core_module_init();
8805         if (err < 0)
8806                 goto err2;
8807
8808         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
8809         if (err < 0)
8810                 goto err3;
8811
8812         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
8813         if (err < 0)
8814                 goto err4;
8815
8816         err = nft_offload_init();
8817         if (err < 0)
8818                 goto err5;
8819
8820         /* must be last */
8821         err = nfnetlink_subsys_register(&nf_tables_subsys);
8822         if (err < 0)
8823                 goto err6;
8824
8825         nft_chain_route_init();
8826
8827         return err;
8828 err6:
8829         nft_offload_exit();
8830 err5:
8831         rhltable_destroy(&nft_objname_ht);
8832 err4:
8833         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
8834 err3:
8835         nf_tables_core_module_exit();
8836 err2:
8837         nft_chain_filter_fini();
8838 err1:
8839         unregister_pernet_subsys(&nf_tables_net_ops);
8840         return err;
8841 }
8842
8843 static void __exit nf_tables_module_exit(void)
8844 {
8845         nfnetlink_subsys_unregister(&nf_tables_subsys);
8846         nft_offload_exit();
8847         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
8848         nft_chain_filter_fini();
8849         nft_chain_route_fini();
8850         unregister_pernet_subsys(&nf_tables_net_ops);
8851         cancel_work_sync(&trans_destroy_work);
8852         rcu_barrier();
8853         rhltable_destroy(&nft_objname_ht);
8854         nf_tables_core_module_exit();
8855 }
8856
8857 module_init(nf_tables_module_init);
8858 module_exit(nf_tables_module_exit);
8859
8860 MODULE_LICENSE("GPL");
8861 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
8862 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);