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 (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 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 (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 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 (nft_expr_more(rule, expr)) {
 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 (nft_expr_more(rule, expr)) {
 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         if (debug_locks)
 623                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 624 #endif
 625 }
 626
 627 static const struct nft_chain_type *
 628 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 629                             u8 family, bool autoload)
 630 {
 631         const struct nft_chain_type *type;
 632
 633         type = __nf_tables_chain_type_lookup(nla, family);
 634         if (type != NULL)
 635                 return type;
 636
 637         lockdep_nfnl_nft_mutex_not_held();
 638 #ifdef CONFIG_MODULES
 639         if (autoload) {
 640                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 641                                        nla_len(nla),
 642                                        (const char *)nla_data(nla)) == -EAGAIN)
 643                         return ERR_PTR(-EAGAIN);
 644         }
 645 #endif
 646         return ERR_PTR(-ENOENT);
 647 }
 648
 649 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 650         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 651                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 652         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 653         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 654         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 655                                     .len = NFT_USERDATA_MAXLEN }
 656 };
 657
 658 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 659                                      u32 portid, u32 seq, int event, u32 flags,
 660                                      int family, const struct nft_table *table)
 661 {
 662         struct nlmsghdr *nlh;
 663         struct nfgenmsg *nfmsg;
 664
 665         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 666         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
 667         if (nlh == NULL)
 668                 goto nla_put_failure;
 669
 670         nfmsg = nlmsg_data(nlh);
 671         nfmsg->nfgen_family     = family;
 672         nfmsg->version          = NFNETLINK_V0;
 673         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
 674
 675         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 676             nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
 677             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 678             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 679                          NFTA_TABLE_PAD))
 680                 goto nla_put_failure;
 681
 682         if (table->udata) {
 683                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 684                         goto nla_put_failure;
 685         }
 686
 687         nlmsg_end(skb, nlh);
 688         return 0;
 689
 690 nla_put_failure:
 691         nlmsg_trim(skb, nlh);
 692         return -1;
 693 }
 694
 695 struct nftnl_skb_parms {
 696         bool report;
 697 };
 698 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 699
 700 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 701                                struct list_head *notify_list)
 702 {
 703         NFT_CB(skb).report = report;
 704         list_add_tail(&skb->list, notify_list);
 705 }
 706
 707 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 708 {
 709         struct sk_buff *skb;
 710         int err;
 711         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;?:0",
 712                               ctx->table->name, ctx->table->handle);
 713
 714         audit_log_nfcfg(buf,
 715                         ctx->family,
 716                         ctx->table->use,
 717                         event == NFT_MSG_NEWTABLE ?
 718                                 AUDIT_NFT_OP_TABLE_REGISTER :
 719                                 AUDIT_NFT_OP_TABLE_UNREGISTER,
 720                         GFP_KERNEL);
 721         kfree(buf);
 722
 723         if (!ctx->report &&
 724             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 725                 return;
 726
 727         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 728         if (skb == NULL)
 729                 goto err;
 730
 731         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 732                                         event, 0, ctx->family, ctx->table);
 733         if (err < 0) {
 734                 kfree_skb(skb);
 735                 goto err;
 736         }
 737
 738         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
 739         return;
 740 err:
 741         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 742 }
 743
 744 static int nf_tables_dump_tables(struct sk_buff *skb,
 745                                  struct netlink_callback *cb)
 746 {
 747         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 748         const struct nft_table *table;
 749         unsigned int idx = 0, s_idx = cb->args[0];
 750         struct net *net = sock_net(skb->sk);
 751         int family = nfmsg->nfgen_family;
 752
 753         rcu_read_lock();
 754         cb->seq = net->nft.base_seq;
 755
 756         list_for_each_entry_rcu(table, &net->nft.tables, list) {
 757                 if (family != NFPROTO_UNSPEC && family != table->family)
 758                         continue;
 759
 760                 if (idx < s_idx)
 761                         goto cont;
 762                 if (idx > s_idx)
 763                         memset(&cb->args[1], 0,
 764                                sizeof(cb->args) - sizeof(cb->args[0]));
 765                 if (!nft_is_active(net, table))
 766                         continue;
 767                 if (nf_tables_fill_table_info(skb, net,
 768                                               NETLINK_CB(cb->skb).portid,
 769                                               cb->nlh->nlmsg_seq,
 770                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 771                                               table->family, table) < 0)
 772                         goto done;
 773
 774                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 775 cont:
 776                 idx++;
 777         }
 778 done:
 779         rcu_read_unlock();
 780         cb->args[0] = idx;
 781         return skb->len;
 782 }
 783
 784 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 785                                       const struct nlmsghdr *nlh,
 786                                       struct netlink_dump_control *c)
 787 {
 788         int err;
 789
 790         if (!try_module_get(THIS_MODULE))
 791                 return -EINVAL;
 792
 793         rcu_read_unlock();
 794         err = netlink_dump_start(nlsk, skb, nlh, c);
 795         rcu_read_lock();
 796         module_put(THIS_MODULE);
 797
 798         return err;
 799 }
 800
 801 /* called with rcu_read_lock held */
 802 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
 803                               struct sk_buff *skb, const struct nlmsghdr *nlh,
 804                               const struct nlattr * const nla[],
 805                               struct netlink_ext_ack *extack)
 806 {
 807         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 808         u8 genmask = nft_genmask_cur(net);
 809         const struct nft_table *table;
 810         struct sk_buff *skb2;
 811         int family = nfmsg->nfgen_family;
 812         int err;
 813
 814         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 815                 struct netlink_dump_control c = {
 816                         .dump = nf_tables_dump_tables,
 817                         .module = THIS_MODULE,
 818                 };
 819
 820                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
 821         }
 822
 823         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
 824         if (IS_ERR(table)) {
 825                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 826                 return PTR_ERR(table);
 827         }
 828
 829         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 830         if (!skb2)
 831                 return -ENOMEM;
 832
 833         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 834                                         nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
 835                                         family, table);
 836         if (err < 0)
 837                 goto err_fill_table_info;
 838
 839         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 840
 841 err_fill_table_info:
 842         kfree_skb(skb2);
 843         return err;
 844 }
 845
 846 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
 847 {
 848         struct nft_chain *chain;
 849         u32 i = 0;
 850
 851         list_for_each_entry(chain, &table->chains, list) {
 852                 if (!nft_is_active_next(net, chain))
 853                         continue;
 854                 if (!nft_is_base_chain(chain))
 855                         continue;
 856
 857                 if (cnt && i++ == cnt)
 858                         break;
 859
 860                 nf_tables_unregister_hook(net, table, chain);
 861         }
 862 }
 863
 864 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
 865 {
 866         struct nft_chain *chain;
 867         int err, i = 0;
 868
 869         list_for_each_entry(chain, &table->chains, list) {
 870                 if (!nft_is_active_next(net, chain))
 871                         continue;
 872                 if (!nft_is_base_chain(chain))
 873                         continue;
 874
 875                 err = nf_tables_register_hook(net, table, chain);
 876                 if (err < 0)
 877                         goto err_register_hooks;
 878
 879                 i++;
 880         }
 881         return 0;
 882
 883 err_register_hooks:
 884         if (i)
 885                 nft_table_disable(net, table, i);
 886         return err;
 887 }
 888
 889 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
 890 {
 891         nft_table_disable(net, table, 0);
 892 }
 893
 894 static int nf_tables_updtable(struct nft_ctx *ctx)
 895 {
 896         struct nft_trans *trans;
 897         u32 flags;
 898         int ret = 0;
 899
 900         if (!ctx->nla[NFTA_TABLE_FLAGS])
 901                 return 0;
 902
 903         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
 904         if (flags & ~NFT_TABLE_F_DORMANT)
 905                 return -EINVAL;
 906
 907         if (flags == ctx->table->flags)
 908                 return 0;
 909
 910         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
 911                                 sizeof(struct nft_trans_table));
 912         if (trans == NULL)
 913                 return -ENOMEM;
 914
 915         if ((flags & NFT_TABLE_F_DORMANT) &&
 916             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
 917                 nft_trans_table_enable(trans) = false;
 918         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
 919                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
 920                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
 921                 ret = nf_tables_table_enable(ctx->net, ctx->table);
 922                 if (ret >= 0)
 923                         nft_trans_table_enable(trans) = true;
 924                 else
 925                         ctx->table->flags |= NFT_TABLE_F_DORMANT;
 926         }
 927         if (ret < 0)
 928                 goto err;
 929
 930         nft_trans_table_update(trans) = true;
 931         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 932         return 0;
 933 err:
 934         nft_trans_destroy(trans);
 935         return ret;
 936 }
 937
 938 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
 939 {
 940         const char *name = data;
 941
 942         return jhash(name, strlen(name), seed);
 943 }
 944
 945 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
 946 {
 947         const struct nft_chain *chain = data;
 948
 949         return nft_chain_hash(chain->name, 0, seed);
 950 }
 951
 952 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
 953                               const void *ptr)
 954 {
 955         const struct nft_chain *chain = ptr;
 956         const char *name = arg->key;
 957
 958         return strcmp(chain->name, name);
 959 }
 960
 961 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
 962 {
 963         const struct nft_object_hash_key *k = data;
 964
 965         seed ^= hash_ptr(k->table, 32);
 966
 967         return jhash(k->name, strlen(k->name), seed);
 968 }
 969
 970 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
 971 {
 972         const struct nft_object *obj = data;
 973
 974         return nft_objname_hash(&obj->key, 0, seed);
 975 }
 976
 977 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
 978                                 const void *ptr)
 979 {
 980         const struct nft_object_hash_key *k = arg->key;
 981         const struct nft_object *obj = ptr;
 982
 983         if (obj->key.table != k->table)
 984                 return -1;
 985
 986         return strcmp(obj->key.name, k->name);
 987 }
 988
 989 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
 990                               struct sk_buff *skb, const struct nlmsghdr *nlh,
 991                               const struct nlattr * const nla[],
 992                               struct netlink_ext_ack *extack)
 993 {
 994         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 995         u8 genmask = nft_genmask_next(net);
 996         int family = nfmsg->nfgen_family;
 997         const struct nlattr *attr;
 998         struct nft_table *table;
 999         struct nft_ctx ctx;
1000         u32 flags = 0;
1001         int err;
1002
1003         lockdep_assert_held(&net->nft.commit_mutex);
1004         attr = nla[NFTA_TABLE_NAME];
1005         table = nft_table_lookup(net, attr, family, genmask);
1006         if (IS_ERR(table)) {
1007                 if (PTR_ERR(table) != -ENOENT)
1008                         return PTR_ERR(table);
1009         } else {
1010                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1011                         NL_SET_BAD_ATTR(extack, attr);
1012                         return -EEXIST;
1013                 }
1014                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1015                         return -EOPNOTSUPP;
1016
1017                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1018                 return nf_tables_updtable(&ctx);
1019         }
1020
1021         if (nla[NFTA_TABLE_FLAGS]) {
1022                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1023                 if (flags & ~NFT_TABLE_F_DORMANT)
1024                         return -EINVAL;
1025         }
1026
1027         err = -ENOMEM;
1028         table = kzalloc(sizeof(*table), GFP_KERNEL);
1029         if (table == NULL)
1030                 goto err_kzalloc;
1031
1032         table->name = nla_strdup(attr, GFP_KERNEL);
1033         if (table->name == NULL)
1034                 goto err_strdup;
1035
1036         if (nla[NFTA_TABLE_USERDATA]) {
1037                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL);
1038                 if (table->udata == NULL)
1039                         goto err_table_udata;
1040
1041                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1042         }
1043
1044         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1045         if (err)
1046                 goto err_chain_ht;
1047
1048         INIT_LIST_HEAD(&table->chains);
1049         INIT_LIST_HEAD(&table->sets);
1050         INIT_LIST_HEAD(&table->objects);
1051         INIT_LIST_HEAD(&table->flowtables);
1052         table->family = family;
1053         table->flags = flags;
1054         table->handle = ++table_handle;
1055
1056         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1057         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1058         if (err < 0)
1059                 goto err_trans;
1060
1061         list_add_tail_rcu(&table->list, &net->nft.tables);
1062         return 0;
1063 err_trans:
1064         rhltable_destroy(&table->chains_ht);
1065 err_chain_ht:
1066         kfree(table->udata);
1067 err_table_udata:
1068         kfree(table->name);
1069 err_strdup:
1070         kfree(table);
1071 err_kzalloc:
1072         return err;
1073 }
1074
1075 static int nft_flush_table(struct nft_ctx *ctx)
1076 {
1077         struct nft_flowtable *flowtable, *nft;
1078         struct nft_chain *chain, *nc;
1079         struct nft_object *obj, *ne;
1080         struct nft_set *set, *ns;
1081         int err;
1082
1083         list_for_each_entry(chain, &ctx->table->chains, list) {
1084                 if (!nft_is_active_next(ctx->net, chain))
1085                         continue;
1086
1087                 if (nft_chain_is_bound(chain))
1088                         continue;
1089
1090                 ctx->chain = chain;
1091
1092                 err = nft_delrule_by_chain(ctx);
1093                 if (err < 0)
1094                         goto out;
1095         }
1096
1097         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1098                 if (!nft_is_active_next(ctx->net, set))
1099                         continue;
1100
1101                 if (nft_set_is_anonymous(set) &&
1102                     !list_empty(&set->bindings))
1103                         continue;
1104
1105                 err = nft_delset(ctx, set);
1106                 if (err < 0)
1107                         goto out;
1108         }
1109
1110         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1111                 if (!nft_is_active_next(ctx->net, flowtable))
1112                         continue;
1113
1114                 err = nft_delflowtable(ctx, flowtable);
1115                 if (err < 0)
1116                         goto out;
1117         }
1118
1119         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1120                 if (!nft_is_active_next(ctx->net, obj))
1121                         continue;
1122
1123                 err = nft_delobj(ctx, obj);
1124                 if (err < 0)
1125                         goto out;
1126         }
1127
1128         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1129                 if (!nft_is_active_next(ctx->net, chain))
1130                         continue;
1131
1132                 if (nft_chain_is_bound(chain))
1133                         continue;
1134
1135                 ctx->chain = chain;
1136
1137                 err = nft_delchain(ctx);
1138                 if (err < 0)
1139                         goto out;
1140         }
1141
1142         err = nft_deltable(ctx);
1143 out:
1144         return err;
1145 }
1146
1147 static int nft_flush(struct nft_ctx *ctx, int family)
1148 {
1149         struct nft_table *table, *nt;
1150         const struct nlattr * const *nla = ctx->nla;
1151         int err = 0;
1152
1153         list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
1154                 if (family != AF_UNSPEC && table->family != family)
1155                         continue;
1156
1157                 ctx->family = table->family;
1158
1159                 if (!nft_is_active_next(ctx->net, table))
1160                         continue;
1161
1162                 if (nla[NFTA_TABLE_NAME] &&
1163                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1164                         continue;
1165
1166                 ctx->table = table;
1167
1168                 err = nft_flush_table(ctx);
1169                 if (err < 0)
1170                         goto out;
1171         }
1172 out:
1173         return err;
1174 }
1175
1176 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1177                               struct sk_buff *skb, const struct nlmsghdr *nlh,
1178                               const struct nlattr * const nla[],
1179                               struct netlink_ext_ack *extack)
1180 {
1181         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1182         u8 genmask = nft_genmask_next(net);
1183         int family = nfmsg->nfgen_family;
1184         const struct nlattr *attr;
1185         struct nft_table *table;
1186         struct nft_ctx ctx;
1187
1188         nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
1189         if (family == AF_UNSPEC ||
1190             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1191                 return nft_flush(&ctx, family);
1192
1193         if (nla[NFTA_TABLE_HANDLE]) {
1194                 attr = nla[NFTA_TABLE_HANDLE];
1195                 table = nft_table_lookup_byhandle(net, attr, genmask);
1196         } else {
1197                 attr = nla[NFTA_TABLE_NAME];
1198                 table = nft_table_lookup(net, attr, family, genmask);
1199         }
1200
1201         if (IS_ERR(table)) {
1202                 NL_SET_BAD_ATTR(extack, attr);
1203                 return PTR_ERR(table);
1204         }
1205
1206         if (nlh->nlmsg_flags & NLM_F_NONREC &&
1207             table->use > 0)
1208                 return -EBUSY;
1209
1210         ctx.family = family;
1211         ctx.table = table;
1212
1213         return nft_flush_table(&ctx);
1214 }
1215
1216 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1217 {
1218         if (WARN_ON(ctx->table->use > 0))
1219                 return;
1220
1221         rhltable_destroy(&ctx->table->chains_ht);
1222         kfree(ctx->table->name);
1223         kfree(ctx->table->udata);
1224         kfree(ctx->table);
1225 }
1226
1227 void nft_register_chain_type(const struct nft_chain_type *ctype)
1228 {
1229         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1230         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1231                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1232                 return;
1233         }
1234         chain_type[ctype->family][ctype->type] = ctype;
1235         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1236 }
1237 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1238
1239 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1240 {
1241         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1242         chain_type[ctype->family][ctype->type] = NULL;
1243         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1244 }
1245 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1246
1247 /*
1248  * Chains
1249  */
1250
1251 static struct nft_chain *
1252 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1253 {
1254         struct nft_chain *chain;
1255
1256         list_for_each_entry(chain, &table->chains, list) {
1257                 if (chain->handle == handle &&
1258                     nft_active_genmask(chain, genmask))
1259                         return chain;
1260         }
1261
1262         return ERR_PTR(-ENOENT);
1263 }
1264
1265 static bool lockdep_commit_lock_is_held(const struct net *net)
1266 {
1267 #ifdef CONFIG_PROVE_LOCKING
1268         return lockdep_is_held(&net->nft.commit_mutex);
1269 #else
1270         return true;
1271 #endif
1272 }
1273
1274 static struct nft_chain *nft_chain_lookup(struct net *net,
1275                                           struct nft_table *table,
1276                                           const struct nlattr *nla, u8 genmask)
1277 {
1278         char search[NFT_CHAIN_MAXNAMELEN + 1];
1279         struct rhlist_head *tmp, *list;
1280         struct nft_chain *chain;
1281
1282         if (nla == NULL)
1283                 return ERR_PTR(-EINVAL);
1284
1285         nla_strlcpy(search, nla, sizeof(search));
1286
1287         WARN_ON(!rcu_read_lock_held() &&
1288                 !lockdep_commit_lock_is_held(net));
1289
1290         chain = ERR_PTR(-ENOENT);
1291         rcu_read_lock();
1292         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1293         if (!list)
1294                 goto out_unlock;
1295
1296         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1297                 if (nft_active_genmask(chain, genmask))
1298                         goto out_unlock;
1299         }
1300         chain = ERR_PTR(-ENOENT);
1301 out_unlock:
1302         rcu_read_unlock();
1303         return chain;
1304 }
1305
1306 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1307         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1308                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1309         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1310         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1311                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1312         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1313         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1314         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1315                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1316         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1317         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1318         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1319         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1320                                     .len = NFT_USERDATA_MAXLEN },
1321 };
1322
1323 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1324         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1325         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1326         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1327                                     .len = IFNAMSIZ - 1 },
1328 };
1329
1330 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1331 {
1332         struct nft_stats *cpu_stats, total;
1333         struct nlattr *nest;
1334         unsigned int seq;
1335         u64 pkts, bytes;
1336         int cpu;
1337
1338         if (!stats)
1339                 return 0;
1340
1341         memset(&total, 0, sizeof(total));
1342         for_each_possible_cpu(cpu) {
1343                 cpu_stats = per_cpu_ptr(stats, cpu);
1344                 do {
1345                         seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1346                         pkts = cpu_stats->pkts;
1347                         bytes = cpu_stats->bytes;
1348                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1349                 total.pkts += pkts;
1350                 total.bytes += bytes;
1351         }
1352         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1353         if (nest == NULL)
1354                 goto nla_put_failure;
1355
1356         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1357                          NFTA_COUNTER_PAD) ||
1358             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1359                          NFTA_COUNTER_PAD))
1360                 goto nla_put_failure;
1361
1362         nla_nest_end(skb, nest);
1363         return 0;
1364
1365 nla_put_failure:
1366         return -ENOSPC;
1367 }
1368
1369 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1370                                    const struct nft_base_chain *basechain)
1371 {
1372         const struct nf_hook_ops *ops = &basechain->ops;
1373         struct nft_hook *hook, *first = NULL;
1374         struct nlattr *nest, *nest_devs;
1375         int n = 0;
1376
1377         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1378         if (nest == NULL)
1379                 goto nla_put_failure;
1380         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1381                 goto nla_put_failure;
1382         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1383                 goto nla_put_failure;
1384
1385         if (nft_base_chain_netdev(family, ops->hooknum)) {
1386                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1387                 list_for_each_entry(hook, &basechain->hook_list, list) {
1388                         if (!first)
1389                                 first = hook;
1390
1391                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1392                                            hook->ops.dev->name))
1393                                 goto nla_put_failure;
1394                         n++;
1395                 }
1396                 nla_nest_end(skb, nest_devs);
1397
1398                 if (n == 1 &&
1399                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1400                         goto nla_put_failure;
1401         }
1402         nla_nest_end(skb, nest);
1403
1404         return 0;
1405 nla_put_failure:
1406         return -1;
1407 }
1408
1409 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1410                                      u32 portid, u32 seq, int event, u32 flags,
1411                                      int family, const struct nft_table *table,
1412                                      const struct nft_chain *chain)
1413 {
1414         struct nlmsghdr *nlh;
1415         struct nfgenmsg *nfmsg;
1416
1417         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1418         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1419         if (nlh == NULL)
1420                 goto nla_put_failure;
1421
1422         nfmsg = nlmsg_data(nlh);
1423         nfmsg->nfgen_family     = family;
1424         nfmsg->version          = NFNETLINK_V0;
1425         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
1426
1427         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1428                 goto nla_put_failure;
1429         if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1430                          NFTA_CHAIN_PAD))
1431                 goto nla_put_failure;
1432         if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1433                 goto nla_put_failure;
1434
1435         if (nft_is_base_chain(chain)) {
1436                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1437                 struct nft_stats __percpu *stats;
1438
1439                 if (nft_dump_basechain_hook(skb, family, basechain))
1440                         goto nla_put_failure;
1441
1442                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1443                                  htonl(basechain->policy)))
1444                         goto nla_put_failure;
1445
1446                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1447                         goto nla_put_failure;
1448
1449                 stats = rcu_dereference_check(basechain->stats,
1450                                               lockdep_commit_lock_is_held(net));
1451                 if (nft_dump_stats(skb, stats))
1452                         goto nla_put_failure;
1453         }
1454
1455         if (chain->flags &&
1456             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1457                 goto nla_put_failure;
1458
1459         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1460                 goto nla_put_failure;
1461
1462         if (chain->udata &&
1463             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1464                 goto nla_put_failure;
1465
1466         nlmsg_end(skb, nlh);
1467         return 0;
1468
1469 nla_put_failure:
1470         nlmsg_trim(skb, nlh);
1471         return -1;
1472 }
1473
1474 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1475 {
1476         struct sk_buff *skb;
1477         int err;
1478         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
1479                               ctx->table->name, ctx->table->handle,
1480                               ctx->chain->name, ctx->chain->handle);
1481
1482         audit_log_nfcfg(buf,
1483                         ctx->family,
1484                         ctx->chain->use,
1485                         event == NFT_MSG_NEWCHAIN ?
1486                                 AUDIT_NFT_OP_CHAIN_REGISTER :
1487                                 AUDIT_NFT_OP_CHAIN_UNREGISTER,
1488                         GFP_KERNEL);
1489         kfree(buf);
1490
1491         if (!ctx->report &&
1492             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1493                 return;
1494
1495         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1496         if (skb == NULL)
1497                 goto err;
1498
1499         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1500                                         event, 0, ctx->family, ctx->table,
1501                                         ctx->chain);
1502         if (err < 0) {
1503                 kfree_skb(skb);
1504                 goto err;
1505         }
1506
1507         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
1508         return;
1509 err:
1510         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1511 }
1512
1513 static int nf_tables_dump_chains(struct sk_buff *skb,
1514                                  struct netlink_callback *cb)
1515 {
1516         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1517         const struct nft_table *table;
1518         const struct nft_chain *chain;
1519         unsigned int idx = 0, s_idx = cb->args[0];
1520         struct net *net = sock_net(skb->sk);
1521         int family = nfmsg->nfgen_family;
1522
1523         rcu_read_lock();
1524         cb->seq = net->nft.base_seq;
1525
1526         list_for_each_entry_rcu(table, &net->nft.tables, list) {
1527                 if (family != NFPROTO_UNSPEC && family != table->family)
1528                         continue;
1529
1530                 list_for_each_entry_rcu(chain, &table->chains, list) {
1531                         if (idx < s_idx)
1532                                 goto cont;
1533                         if (idx > s_idx)
1534                                 memset(&cb->args[1], 0,
1535                                        sizeof(cb->args) - sizeof(cb->args[0]));
1536                         if (!nft_is_active(net, chain))
1537                                 continue;
1538                         if (nf_tables_fill_chain_info(skb, net,
1539                                                       NETLINK_CB(cb->skb).portid,
1540                                                       cb->nlh->nlmsg_seq,
1541                                                       NFT_MSG_NEWCHAIN,
1542                                                       NLM_F_MULTI,
1543                                                       table->family, table,
1544                                                       chain) < 0)
1545                                 goto done;
1546
1547                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1548 cont:
1549                         idx++;
1550                 }
1551         }
1552 done:
1553         rcu_read_unlock();
1554         cb->args[0] = idx;
1555         return skb->len;
1556 }
1557
1558 /* called with rcu_read_lock held */
1559 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1560                               struct sk_buff *skb, const struct nlmsghdr *nlh,
1561                               const struct nlattr * const nla[],
1562                               struct netlink_ext_ack *extack)
1563 {
1564         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1565         u8 genmask = nft_genmask_cur(net);
1566         const struct nft_chain *chain;
1567         struct nft_table *table;
1568         struct sk_buff *skb2;
1569         int family = nfmsg->nfgen_family;
1570         int err;
1571
1572         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1573                 struct netlink_dump_control c = {
1574                         .dump = nf_tables_dump_chains,
1575                         .module = THIS_MODULE,
1576                 };
1577
1578                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1579         }
1580
1581         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1582         if (IS_ERR(table)) {
1583                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1584                 return PTR_ERR(table);
1585         }
1586
1587         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1588         if (IS_ERR(chain)) {
1589                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1590                 return PTR_ERR(chain);
1591         }
1592
1593         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1594         if (!skb2)
1595                 return -ENOMEM;
1596
1597         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1598                                         nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1599                                         family, table, chain);
1600         if (err < 0)
1601                 goto err_fill_chain_info;
1602
1603         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1604
1605 err_fill_chain_info:
1606         kfree_skb(skb2);
1607         return err;
1608 }
1609
1610 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1611         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1612         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1613 };
1614
1615 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1616 {
1617         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1618         struct nft_stats __percpu *newstats;
1619         struct nft_stats *stats;
1620         int err;
1621
1622         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1623                                           nft_counter_policy, NULL);
1624         if (err < 0)
1625                 return ERR_PTR(err);
1626
1627         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1628                 return ERR_PTR(-EINVAL);
1629
1630         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1631         if (newstats == NULL)
1632                 return ERR_PTR(-ENOMEM);
1633
1634         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1635          * are not exposed to userspace.
1636          */
1637         preempt_disable();
1638         stats = this_cpu_ptr(newstats);
1639         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1640         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1641         preempt_enable();
1642
1643         return newstats;
1644 }
1645
1646 static void nft_chain_stats_replace(struct nft_trans *trans)
1647 {
1648         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1649
1650         if (!nft_trans_chain_stats(trans))
1651                 return;
1652
1653         nft_trans_chain_stats(trans) =
1654                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1655                                     lockdep_commit_lock_is_held(trans->ctx.net));
1656
1657         if (!nft_trans_chain_stats(trans))
1658                 static_branch_inc(&nft_counters_enabled);
1659 }
1660
1661 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1662 {
1663         struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1664         struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1665
1666         if (g0 != g1)
1667                 kvfree(g1);
1668         kvfree(g0);
1669
1670         /* should be NULL either via abort or via successful commit */
1671         WARN_ON_ONCE(chain->rules_next);
1672         kvfree(chain->rules_next);
1673 }
1674
1675 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1676 {
1677         struct nft_chain *chain = ctx->chain;
1678         struct nft_hook *hook, *next;
1679
1680         if (WARN_ON(chain->use > 0))
1681                 return;
1682
1683         /* no concurrent access possible anymore */
1684         nf_tables_chain_free_chain_rules(chain);
1685
1686         if (nft_is_base_chain(chain)) {
1687                 struct nft_base_chain *basechain = nft_base_chain(chain);
1688
1689                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1690                         list_for_each_entry_safe(hook, next,
1691                                                  &basechain->hook_list, list) {
1692                                 list_del_rcu(&hook->list);
1693                                 kfree_rcu(hook, rcu);
1694                         }
1695                 }
1696                 module_put(basechain->type->owner);
1697                 if (rcu_access_pointer(basechain->stats)) {
1698                         static_branch_dec(&nft_counters_enabled);
1699                         free_percpu(rcu_dereference_raw(basechain->stats));
1700                 }
1701                 kfree(chain->name);
1702                 kfree(chain->udata);
1703                 kfree(basechain);
1704         } else {
1705                 kfree(chain->name);
1706                 kfree(chain->udata);
1707                 kfree(chain);
1708         }
1709 }
1710
1711 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1712                                               const struct nlattr *attr)
1713 {
1714         struct net_device *dev;
1715         char ifname[IFNAMSIZ];
1716         struct nft_hook *hook;
1717         int err;
1718
1719         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1720         if (!hook) {
1721                 err = -ENOMEM;
1722                 goto err_hook_alloc;
1723         }
1724
1725         nla_strlcpy(ifname, attr, IFNAMSIZ);
1726         dev = __dev_get_by_name(net, ifname);
1727         if (!dev) {
1728                 err = -ENOENT;
1729                 goto err_hook_dev;
1730         }
1731         hook->ops.dev = dev;
1732         hook->inactive = false;
1733
1734         return hook;
1735
1736 err_hook_dev:
1737         kfree(hook);
1738 err_hook_alloc:
1739         return ERR_PTR(err);
1740 }
1741
1742 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1743                                            const struct nft_hook *this)
1744 {
1745         struct nft_hook *hook;
1746
1747         list_for_each_entry(hook, hook_list, list) {
1748                 if (this->ops.dev == hook->ops.dev)
1749                         return hook;
1750         }
1751
1752         return NULL;
1753 }
1754
1755 static int nf_tables_parse_netdev_hooks(struct net *net,
1756                                         const struct nlattr *attr,
1757                                         struct list_head *hook_list)
1758 {
1759         struct nft_hook *hook, *next;
1760         const struct nlattr *tmp;
1761         int rem, n = 0, err;
1762
1763         nla_for_each_nested(tmp, attr, rem) {
1764                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1765                         err = -EINVAL;
1766                         goto err_hook;
1767                 }
1768
1769                 hook = nft_netdev_hook_alloc(net, tmp);
1770                 if (IS_ERR(hook)) {
1771                         err = PTR_ERR(hook);
1772                         goto err_hook;
1773                 }
1774                 if (nft_hook_list_find(hook_list, hook)) {
1775                         kfree(hook);
1776                         err = -EEXIST;
1777                         goto err_hook;
1778                 }
1779                 list_add_tail(&hook->list, hook_list);
1780                 n++;
1781
1782                 if (n == NFT_NETDEVICE_MAX) {
1783                         err = -EFBIG;
1784                         goto err_hook;
1785                 }
1786         }
1787
1788         return 0;
1789
1790 err_hook:
1791         list_for_each_entry_safe(hook, next, hook_list, list) {
1792                 list_del(&hook->list);
1793                 kfree(hook);
1794         }
1795         return err;
1796 }
1797
1798 struct nft_chain_hook {
1799         u32                             num;
1800         s32                             priority;
1801         const struct nft_chain_type     *type;
1802         struct list_head                list;
1803 };
1804
1805 static int nft_chain_parse_netdev(struct net *net,
1806                                   struct nlattr *tb[],
1807                                   struct list_head *hook_list)
1808 {
1809         struct nft_hook *hook;
1810         int err;
1811
1812         if (tb[NFTA_HOOK_DEV]) {
1813                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1814                 if (IS_ERR(hook))
1815                         return PTR_ERR(hook);
1816
1817                 list_add_tail(&hook->list, hook_list);
1818         } else if (tb[NFTA_HOOK_DEVS]) {
1819                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1820                                                    hook_list);
1821                 if (err < 0)
1822                         return err;
1823
1824                 if (list_empty(hook_list))
1825                         return -EINVAL;
1826         } else {
1827                 return -EINVAL;
1828         }
1829
1830         return 0;
1831 }
1832
1833 static int nft_chain_parse_hook(struct net *net,
1834                                 const struct nlattr * const nla[],
1835                                 struct nft_chain_hook *hook, u8 family,
1836                                 bool autoload)
1837 {
1838         struct nlattr *ha[NFTA_HOOK_MAX + 1];
1839         const struct nft_chain_type *type;
1840         int err;
1841
1842         lockdep_assert_held(&net->nft.commit_mutex);
1843         lockdep_nfnl_nft_mutex_not_held();
1844
1845         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1846                                           nla[NFTA_CHAIN_HOOK],
1847                                           nft_hook_policy, NULL);
1848         if (err < 0)
1849                 return err;
1850
1851         if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1852             ha[NFTA_HOOK_PRIORITY] == NULL)
1853                 return -EINVAL;
1854
1855         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1856         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1857
1858         type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1859         if (!type)
1860                 return -EOPNOTSUPP;
1861
1862         if (nla[NFTA_CHAIN_TYPE]) {
1863                 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1864                                                    family, autoload);
1865                 if (IS_ERR(type))
1866                         return PTR_ERR(type);
1867         }
1868         if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1869                 return -EOPNOTSUPP;
1870
1871         if (type->type == NFT_CHAIN_T_NAT &&
1872             hook->priority <= NF_IP_PRI_CONNTRACK)
1873                 return -EOPNOTSUPP;
1874
1875         if (!try_module_get(type->owner))
1876                 return -ENOENT;
1877
1878         hook->type = type;
1879
1880         INIT_LIST_HEAD(&hook->list);
1881         if (nft_base_chain_netdev(family, hook->num)) {
1882                 err = nft_chain_parse_netdev(net, ha, &hook->list);
1883                 if (err < 0) {
1884                         module_put(type->owner);
1885                         return err;
1886                 }
1887         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
1888                 module_put(type->owner);
1889                 return -EOPNOTSUPP;
1890         }
1891
1892         return 0;
1893 }
1894
1895 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1896 {
1897         struct nft_hook *h, *next;
1898
1899         list_for_each_entry_safe(h, next, &hook->list, list) {
1900                 list_del(&h->list);
1901                 kfree(h);
1902         }
1903         module_put(hook->type->owner);
1904 }
1905
1906 struct nft_rules_old {
1907         struct rcu_head h;
1908         struct nft_rule **start;
1909 };
1910
1911 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1912                                                      unsigned int alloc)
1913 {
1914         if (alloc > INT_MAX)
1915                 return NULL;
1916
1917         alloc += 1;     /* NULL, ends rules */
1918         if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1919                 return NULL;
1920
1921         alloc *= sizeof(struct nft_rule *);
1922         alloc += sizeof(struct nft_rules_old);
1923
1924         return kvmalloc(alloc, GFP_KERNEL);
1925 }
1926
1927 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
1928                                     const struct nft_chain_hook *hook,
1929                                     struct nft_chain *chain)
1930 {
1931         ops->pf         = family;
1932         ops->hooknum    = hook->num;
1933         ops->priority   = hook->priority;
1934         ops->priv       = chain;
1935         ops->hook       = hook->type->hooks[ops->hooknum];
1936 }
1937
1938 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
1939                               struct nft_chain_hook *hook, u32 flags)
1940 {
1941         struct nft_chain *chain;
1942         struct nft_hook *h;
1943
1944         basechain->type = hook->type;
1945         INIT_LIST_HEAD(&basechain->hook_list);
1946         chain = &basechain->chain;
1947
1948         if (nft_base_chain_netdev(family, hook->num)) {
1949                 list_splice_init(&hook->list, &basechain->hook_list);
1950                 list_for_each_entry(h, &basechain->hook_list, list)
1951                         nft_basechain_hook_init(&h->ops, family, hook, chain);
1952
1953                 basechain->ops.hooknum  = hook->num;
1954                 basechain->ops.priority = hook->priority;
1955         } else {
1956                 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
1957         }
1958
1959         chain->flags |= NFT_CHAIN_BASE | flags;
1960         basechain->policy = NF_ACCEPT;
1961         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
1962             nft_chain_offload_priority(basechain) < 0)
1963                 return -EOPNOTSUPP;
1964
1965         flow_block_init(&basechain->flow_block);
1966
1967         return 0;
1968 }
1969
1970 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
1971 {
1972         int err;
1973
1974         err = rhltable_insert_key(&table->chains_ht, chain->name,
1975                                   &chain->rhlhead, nft_chain_ht_params);
1976         if (err)
1977                 return err;
1978
1979         list_add_tail_rcu(&chain->list, &table->chains);
1980
1981         return 0;
1982 }
1983
1984 static u64 chain_id;
1985
1986 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1987                               u8 policy, u32 flags)
1988 {
1989         const struct nlattr * const *nla = ctx->nla;
1990         struct nft_table *table = ctx->table;
1991         struct nft_base_chain *basechain;
1992         struct nft_stats __percpu *stats;
1993         struct net *net = ctx->net;
1994         char name[NFT_NAME_MAXLEN];
1995         struct nft_trans *trans;
1996         struct nft_chain *chain;
1997         struct nft_rule **rules;
1998         int err;
1999
2000         if (table->use == UINT_MAX)
2001                 return -EOVERFLOW;
2002
2003         if (nla[NFTA_CHAIN_HOOK]) {
2004                 struct nft_chain_hook hook;
2005
2006                 if (flags & NFT_CHAIN_BINDING)
2007                         return -EOPNOTSUPP;
2008
2009                 err = nft_chain_parse_hook(net, nla, &hook, family, true);
2010                 if (err < 0)
2011                         return err;
2012
2013                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
2014                 if (basechain == NULL) {
2015                         nft_chain_release_hook(&hook);
2016                         return -ENOMEM;
2017                 }
2018                 chain = &basechain->chain;
2019
2020                 if (nla[NFTA_CHAIN_COUNTERS]) {
2021                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2022                         if (IS_ERR(stats)) {
2023                                 nft_chain_release_hook(&hook);
2024                                 kfree(basechain);
2025                                 return PTR_ERR(stats);
2026                         }
2027                         rcu_assign_pointer(basechain->stats, stats);
2028                         static_branch_inc(&nft_counters_enabled);
2029                 }
2030
2031                 err = nft_basechain_init(basechain, family, &hook, flags);
2032                 if (err < 0) {
2033                         nft_chain_release_hook(&hook);
2034                         kfree(basechain);
2035                         return err;
2036                 }
2037         } else {
2038                 if (flags & NFT_CHAIN_BASE)
2039                         return -EINVAL;
2040                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2041                         return -EOPNOTSUPP;
2042
2043                 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2044                 if (chain == NULL)
2045                         return -ENOMEM;
2046
2047                 chain->flags = flags;
2048         }
2049         ctx->chain = chain;
2050
2051         INIT_LIST_HEAD(&chain->rules);
2052         chain->handle = nf_tables_alloc_handle(table);
2053         chain->table = table;
2054
2055         if (nla[NFTA_CHAIN_NAME]) {
2056                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2057         } else {
2058                 if (!(flags & NFT_CHAIN_BINDING)) {
2059                         err = -EINVAL;
2060                         goto err_destroy_chain;
2061                 }
2062
2063                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2064                 chain->name = kstrdup(name, GFP_KERNEL);
2065         }
2066
2067         if (!chain->name) {
2068                 err = -ENOMEM;
2069                 goto err_destroy_chain;
2070         }
2071
2072         if (nla[NFTA_CHAIN_USERDATA]) {
2073                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL);
2074                 if (chain->udata == NULL) {
2075                         err = -ENOMEM;
2076                         goto err_destroy_chain;
2077                 }
2078                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2079         }
2080
2081         rules = nf_tables_chain_alloc_rules(chain, 0);
2082         if (!rules) {
2083                 err = -ENOMEM;
2084                 goto err_destroy_chain;
2085         }
2086
2087         *rules = NULL;
2088         rcu_assign_pointer(chain->rules_gen_0, rules);
2089         rcu_assign_pointer(chain->rules_gen_1, rules);
2090
2091         err = nf_tables_register_hook(net, table, chain);
2092         if (err < 0)
2093                 goto err_destroy_chain;
2094
2095         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2096         if (IS_ERR(trans)) {
2097                 err = PTR_ERR(trans);
2098                 goto err_unregister_hook;
2099         }
2100
2101         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2102         if (nft_is_base_chain(chain))
2103                 nft_trans_chain_policy(trans) = policy;
2104
2105         err = nft_chain_add(table, chain);
2106         if (err < 0) {
2107                 nft_trans_destroy(trans);
2108                 goto err_unregister_hook;
2109         }
2110
2111         table->use++;
2112
2113         return 0;
2114 err_unregister_hook:
2115         nf_tables_unregister_hook(net, table, chain);
2116 err_destroy_chain:
2117         nf_tables_chain_destroy(ctx);
2118
2119         return err;
2120 }
2121
2122 static bool nft_hook_list_equal(struct list_head *hook_list1,
2123                                 struct list_head *hook_list2)
2124 {
2125         struct nft_hook *hook;
2126         int n = 0, m = 0;
2127
2128         n = 0;
2129         list_for_each_entry(hook, hook_list2, list) {
2130                 if (!nft_hook_list_find(hook_list1, hook))
2131                         return false;
2132
2133                 n++;
2134         }
2135         list_for_each_entry(hook, hook_list1, list)
2136                 m++;
2137
2138         return n == m;
2139 }
2140
2141 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2142                               u32 flags, const struct nlattr *attr,
2143                               struct netlink_ext_ack *extack)
2144 {
2145         const struct nlattr * const *nla = ctx->nla;
2146         struct nft_table *table = ctx->table;
2147         struct nft_chain *chain = ctx->chain;
2148         struct nft_base_chain *basechain;
2149         struct nft_stats *stats = NULL;
2150         struct nft_chain_hook hook;
2151         struct nf_hook_ops *ops;
2152         struct nft_trans *trans;
2153         int err;
2154
2155         if (chain->flags ^ flags)
2156                 return -EOPNOTSUPP;
2157
2158         if (nla[NFTA_CHAIN_HOOK]) {
2159                 if (!nft_is_base_chain(chain)) {
2160                         NL_SET_BAD_ATTR(extack, attr);
2161                         return -EEXIST;
2162                 }
2163                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2164                                            false);
2165                 if (err < 0)
2166                         return err;
2167
2168                 basechain = nft_base_chain(chain);
2169                 if (basechain->type != hook.type) {
2170                         nft_chain_release_hook(&hook);
2171                         NL_SET_BAD_ATTR(extack, attr);
2172                         return -EEXIST;
2173                 }
2174
2175                 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2176                         if (!nft_hook_list_equal(&basechain->hook_list,
2177                                                  &hook.list)) {
2178                                 nft_chain_release_hook(&hook);
2179                                 NL_SET_BAD_ATTR(extack, attr);
2180                                 return -EEXIST;
2181                         }
2182                 } else {
2183                         ops = &basechain->ops;
2184                         if (ops->hooknum != hook.num ||
2185                             ops->priority != hook.priority) {
2186                                 nft_chain_release_hook(&hook);
2187                                 NL_SET_BAD_ATTR(extack, attr);
2188                                 return -EEXIST;
2189                         }
2190                 }
2191                 nft_chain_release_hook(&hook);
2192         }
2193
2194         if (nla[NFTA_CHAIN_HANDLE] &&
2195             nla[NFTA_CHAIN_NAME]) {
2196                 struct nft_chain *chain2;
2197
2198                 chain2 = nft_chain_lookup(ctx->net, table,
2199                                           nla[NFTA_CHAIN_NAME], genmask);
2200                 if (!IS_ERR(chain2)) {
2201                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2202                         return -EEXIST;
2203                 }
2204         }
2205
2206         if (nla[NFTA_CHAIN_COUNTERS]) {
2207                 if (!nft_is_base_chain(chain))
2208                         return -EOPNOTSUPP;
2209
2210                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2211                 if (IS_ERR(stats))
2212                         return PTR_ERR(stats);
2213         }
2214
2215         err = -ENOMEM;
2216         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2217                                 sizeof(struct nft_trans_chain));
2218         if (trans == NULL)
2219                 goto err;
2220
2221         nft_trans_chain_stats(trans) = stats;
2222         nft_trans_chain_update(trans) = true;
2223
2224         if (nla[NFTA_CHAIN_POLICY])
2225                 nft_trans_chain_policy(trans) = policy;
2226         else
2227                 nft_trans_chain_policy(trans) = -1;
2228
2229         if (nla[NFTA_CHAIN_HANDLE] &&
2230             nla[NFTA_CHAIN_NAME]) {
2231                 struct nft_trans *tmp;
2232                 char *name;
2233
2234                 err = -ENOMEM;
2235                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2236                 if (!name)
2237                         goto err;
2238
2239                 err = -EEXIST;
2240                 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
2241                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2242                             tmp->ctx.table == table &&
2243                             nft_trans_chain_update(tmp) &&
2244                             nft_trans_chain_name(tmp) &&
2245                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2246                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2247                                 kfree(name);
2248                                 goto err;
2249                         }
2250                 }
2251
2252                 nft_trans_chain_name(trans) = name;
2253         }
2254         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2255
2256         return 0;
2257 err:
2258         free_percpu(stats);
2259         kfree(trans);
2260         return err;
2261 }
2262
2263 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2264                                                const struct nlattr *nla)
2265 {
2266         u32 id = ntohl(nla_get_be32(nla));
2267         struct nft_trans *trans;
2268
2269         list_for_each_entry(trans, &net->nft.commit_list, list) {
2270                 struct nft_chain *chain = trans->ctx.chain;
2271
2272                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2273                     id == nft_trans_chain_id(trans))
2274                         return chain;
2275         }
2276         return ERR_PTR(-ENOENT);
2277 }
2278
2279 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
2280                               struct sk_buff *skb, const struct nlmsghdr *nlh,
2281                               const struct nlattr * const nla[],
2282                               struct netlink_ext_ack *extack)
2283 {
2284         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2285         u8 genmask = nft_genmask_next(net);
2286         int family = nfmsg->nfgen_family;
2287         struct nft_chain *chain = NULL;
2288         const struct nlattr *attr;
2289         struct nft_table *table;
2290         u8 policy = NF_ACCEPT;
2291         struct nft_ctx ctx;
2292         u64 handle = 0;
2293         u32 flags = 0;
2294
2295         lockdep_assert_held(&net->nft.commit_mutex);
2296
2297         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2298         if (IS_ERR(table)) {
2299                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2300                 return PTR_ERR(table);
2301         }
2302
2303         chain = NULL;
2304         attr = nla[NFTA_CHAIN_NAME];
2305
2306         if (nla[NFTA_CHAIN_HANDLE]) {
2307                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2308                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2309                 if (IS_ERR(chain)) {
2310                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2311                         return PTR_ERR(chain);
2312                 }
2313                 attr = nla[NFTA_CHAIN_HANDLE];
2314         } else if (nla[NFTA_CHAIN_NAME]) {
2315                 chain = nft_chain_lookup(net, table, attr, genmask);
2316                 if (IS_ERR(chain)) {
2317                         if (PTR_ERR(chain) != -ENOENT) {
2318                                 NL_SET_BAD_ATTR(extack, attr);
2319                                 return PTR_ERR(chain);
2320                         }
2321                         chain = NULL;
2322                 }
2323         } else if (!nla[NFTA_CHAIN_ID]) {
2324                 return -EINVAL;
2325         }
2326
2327         if (nla[NFTA_CHAIN_POLICY]) {
2328                 if (chain != NULL &&
2329                     !nft_is_base_chain(chain)) {
2330                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2331                         return -EOPNOTSUPP;
2332                 }
2333
2334                 if (chain == NULL &&
2335                     nla[NFTA_CHAIN_HOOK] == NULL) {
2336                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2337                         return -EOPNOTSUPP;
2338                 }
2339
2340                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2341                 switch (policy) {
2342                 case NF_DROP:
2343                 case NF_ACCEPT:
2344                         break;
2345                 default:
2346                         return -EINVAL;
2347                 }
2348         }
2349
2350         if (nla[NFTA_CHAIN_FLAGS])
2351                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2352         else if (chain)
2353                 flags = chain->flags;
2354
2355         if (flags & ~NFT_CHAIN_FLAGS)
2356                 return -EOPNOTSUPP;
2357
2358         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2359
2360         if (chain != NULL) {
2361                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2362                         NL_SET_BAD_ATTR(extack, attr);
2363                         return -EEXIST;
2364                 }
2365                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2366                         return -EOPNOTSUPP;
2367
2368                 flags |= chain->flags & NFT_CHAIN_BASE;
2369                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2370                                           extack);
2371         }
2372
2373         return nf_tables_addchain(&ctx, family, genmask, policy, flags);
2374 }
2375
2376 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
2377                               struct sk_buff *skb, const struct nlmsghdr *nlh,
2378                               const struct nlattr * const nla[],
2379                               struct netlink_ext_ack *extack)
2380 {
2381         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2382         u8 genmask = nft_genmask_next(net);
2383         int family = nfmsg->nfgen_family;
2384         const struct nlattr *attr;
2385         struct nft_table *table;
2386         struct nft_chain *chain;
2387         struct nft_rule *rule;
2388         struct nft_ctx ctx;
2389         u64 handle;
2390         u32 use;
2391         int err;
2392
2393         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2394         if (IS_ERR(table)) {
2395                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2396                 return PTR_ERR(table);
2397         }
2398
2399         if (nla[NFTA_CHAIN_HANDLE]) {
2400                 attr = nla[NFTA_CHAIN_HANDLE];
2401                 handle = be64_to_cpu(nla_get_be64(attr));
2402                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2403         } else {
2404                 attr = nla[NFTA_CHAIN_NAME];
2405                 chain = nft_chain_lookup(net, table, attr, genmask);
2406         }
2407         if (IS_ERR(chain)) {
2408                 NL_SET_BAD_ATTR(extack, attr);
2409                 return PTR_ERR(chain);
2410         }
2411
2412         if (nlh->nlmsg_flags & NLM_F_NONREC &&
2413             chain->use > 0)
2414                 return -EBUSY;
2415
2416         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2417
2418         use = chain->use;
2419         list_for_each_entry(rule, &chain->rules, list) {
2420                 if (!nft_is_active_next(net, rule))
2421                         continue;
2422                 use--;
2423
2424                 err = nft_delrule(&ctx, rule);
2425                 if (err < 0)
2426                         return err;
2427         }
2428
2429         /* There are rules and elements that are still holding references to us,
2430          * we cannot do a recursive removal in this case.
2431          */
2432         if (use > 0) {
2433                 NL_SET_BAD_ATTR(extack, attr);
2434                 return -EBUSY;
2435         }
2436
2437         return nft_delchain(&ctx);
2438 }
2439
2440 /*
2441  * Expressions
2442  */
2443
2444 /**
2445  *      nft_register_expr - register nf_tables expr type
2446  *      @type: expr type
2447  *
2448  *      Registers the expr type for use with nf_tables. Returns zero on
2449  *      success or a negative errno code otherwise.
2450  */
2451 int nft_register_expr(struct nft_expr_type *type)
2452 {
2453         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2454         if (type->family == NFPROTO_UNSPEC)
2455                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2456         else
2457                 list_add_rcu(&type->list, &nf_tables_expressions);
2458         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2459         return 0;
2460 }
2461 EXPORT_SYMBOL_GPL(nft_register_expr);
2462
2463 /**
2464  *      nft_unregister_expr - unregister nf_tables expr type
2465  *      @type: expr type
2466  *
2467  *      Unregisters the expr typefor use with nf_tables.
2468  */
2469 void nft_unregister_expr(struct nft_expr_type *type)
2470 {
2471         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2472         list_del_rcu(&type->list);
2473         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2474 }
2475 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2476
2477 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2478                                                        struct nlattr *nla)
2479 {
2480         const struct nft_expr_type *type, *candidate = NULL;
2481
2482         list_for_each_entry(type, &nf_tables_expressions, list) {
2483                 if (!nla_strcmp(nla, type->name)) {
2484                         if (!type->family && !candidate)
2485                                 candidate = type;
2486                         else if (type->family == family)
2487                                 candidate = type;
2488                 }
2489         }
2490         return candidate;
2491 }
2492
2493 #ifdef CONFIG_MODULES
2494 static int nft_expr_type_request_module(struct net *net, u8 family,
2495                                         struct nlattr *nla)
2496 {
2497         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2498                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2499                 return -EAGAIN;
2500
2501         return 0;
2502 }
2503 #endif
2504
2505 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2506                                                      u8 family,
2507                                                      struct nlattr *nla)
2508 {
2509         const struct nft_expr_type *type;
2510
2511         if (nla == NULL)
2512                 return ERR_PTR(-EINVAL);
2513
2514         type = __nft_expr_type_get(family, nla);
2515         if (type != NULL && try_module_get(type->owner))
2516                 return type;
2517
2518         lockdep_nfnl_nft_mutex_not_held();
2519 #ifdef CONFIG_MODULES
2520         if (type == NULL) {
2521                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2522                         return ERR_PTR(-EAGAIN);
2523
2524                 if (nft_request_module(net, "nft-expr-%.*s",
2525                                        nla_len(nla),
2526                                        (char *)nla_data(nla)) == -EAGAIN)
2527                         return ERR_PTR(-EAGAIN);
2528         }
2529 #endif
2530         return ERR_PTR(-ENOENT);
2531 }
2532
2533 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2534         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2535                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2536         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2537 };
2538
2539 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2540                                     const struct nft_expr *expr)
2541 {
2542         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2543                 goto nla_put_failure;
2544
2545         if (expr->ops->dump) {
2546                 struct nlattr *data = nla_nest_start_noflag(skb,
2547                                                             NFTA_EXPR_DATA);
2548                 if (data == NULL)
2549                         goto nla_put_failure;
2550                 if (expr->ops->dump(skb, expr) < 0)
2551                         goto nla_put_failure;
2552                 nla_nest_end(skb, data);
2553         }
2554
2555         return skb->len;
2556
2557 nla_put_failure:
2558         return -1;
2559 };
2560
2561 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2562                   const struct nft_expr *expr)
2563 {
2564         struct nlattr *nest;
2565
2566         nest = nla_nest_start_noflag(skb, attr);
2567         if (!nest)
2568                 goto nla_put_failure;
2569         if (nf_tables_fill_expr_info(skb, expr) < 0)
2570                 goto nla_put_failure;
2571         nla_nest_end(skb, nest);
2572         return 0;
2573
2574 nla_put_failure:
2575         return -1;
2576 }
2577
2578 struct nft_expr_info {
2579         const struct nft_expr_ops       *ops;
2580         const struct nlattr             *attr;
2581         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2582 };
2583
2584 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2585                                 const struct nlattr *nla,
2586                                 struct nft_expr_info *info)
2587 {
2588         const struct nft_expr_type *type;
2589         const struct nft_expr_ops *ops;
2590         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2591         int err;
2592
2593         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2594                                           nft_expr_policy, NULL);
2595         if (err < 0)
2596                 return err;
2597
2598         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2599         if (IS_ERR(type))
2600                 return PTR_ERR(type);
2601
2602         if (tb[NFTA_EXPR_DATA]) {
2603                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2604                                                   tb[NFTA_EXPR_DATA],
2605                                                   type->policy, NULL);
2606                 if (err < 0)
2607                         goto err1;
2608         } else
2609                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2610
2611         if (type->select_ops != NULL) {
2612                 ops = type->select_ops(ctx,
2613                                        (const struct nlattr * const *)info->tb);
2614                 if (IS_ERR(ops)) {
2615                         err = PTR_ERR(ops);
2616 #ifdef CONFIG_MODULES
2617                         if (err == -EAGAIN)
2618                                 if (nft_expr_type_request_module(ctx->net,
2619                                                                  ctx->family,
2620                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2621                                         err = -ENOENT;
2622 #endif
2623                         goto err1;
2624                 }
2625         } else
2626                 ops = type->ops;
2627
2628         info->attr = nla;
2629         info->ops = ops;
2630
2631         return 0;
2632
2633 err1:
2634         module_put(type->owner);
2635         return err;
2636 }
2637
2638 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2639                              const struct nft_expr_info *info,
2640                              struct nft_expr *expr)
2641 {
2642         const struct nft_expr_ops *ops = info->ops;
2643         int err;
2644
2645         expr->ops = ops;
2646         if (ops->init) {
2647                 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2648                 if (err < 0)
2649                         goto err1;
2650         }
2651
2652         return 0;
2653 err1:
2654         expr->ops = NULL;
2655         return err;
2656 }
2657
2658 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2659                                    struct nft_expr *expr)
2660 {
2661         const struct nft_expr_type *type = expr->ops->type;
2662
2663         if (expr->ops->destroy)
2664                 expr->ops->destroy(ctx, expr);
2665         module_put(type->owner);
2666 }
2667
2668 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2669                                       const struct nlattr *nla)
2670 {
2671         struct nft_expr_info info;
2672         struct nft_expr *expr;
2673         struct module *owner;
2674         int err;
2675
2676         err = nf_tables_expr_parse(ctx, nla, &info);
2677         if (err < 0)
2678                 goto err1;
2679
2680         err = -ENOMEM;
2681         expr = kzalloc(info.ops->size, GFP_KERNEL);
2682         if (expr == NULL)
2683                 goto err2;
2684
2685         err = nf_tables_newexpr(ctx, &info, expr);
2686         if (err < 0)
2687                 goto err3;
2688
2689         return expr;
2690 err3:
2691         kfree(expr);
2692 err2:
2693         owner = info.ops->type->owner;
2694         if (info.ops->type->release_ops)
2695                 info.ops->type->release_ops(info.ops);
2696
2697         module_put(owner);
2698 err1:
2699         return ERR_PTR(err);
2700 }
2701
2702 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2703 {
2704         int err;
2705
2706         if (src->ops->clone) {
2707                 dst->ops = src->ops;
2708                 err = src->ops->clone(dst, src);
2709                 if (err < 0)
2710                         return err;
2711         } else {
2712                 memcpy(dst, src, src->ops->size);
2713         }
2714
2715         __module_get(src->ops->type->owner);
2716
2717         return 0;
2718 }
2719
2720 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2721 {
2722         nf_tables_expr_destroy(ctx, expr);
2723         kfree(expr);
2724 }
2725
2726 /*
2727  * Rules
2728  */
2729
2730 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2731                                           u64 handle)
2732 {
2733         struct nft_rule *rule;
2734
2735         // FIXME: this sucks
2736         list_for_each_entry_rcu(rule, &chain->rules, list) {
2737                 if (handle == rule->handle)
2738                         return rule;
2739         }
2740
2741         return ERR_PTR(-ENOENT);
2742 }
2743
2744 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2745                                         const struct nlattr *nla)
2746 {
2747         if (nla == NULL)
2748                 return ERR_PTR(-EINVAL);
2749
2750         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2751 }
2752
2753 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2754         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
2755                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
2756         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
2757                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
2758         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
2759         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2760         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
2761         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
2762         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
2763                                     .len = NFT_USERDATA_MAXLEN },
2764         [NFTA_RULE_ID]          = { .type = NLA_U32 },
2765         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2766         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
2767 };
2768
2769 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2770                                     u32 portid, u32 seq, int event,
2771                                     u32 flags, int family,
2772                                     const struct nft_table *table,
2773                                     const struct nft_chain *chain,
2774                                     const struct nft_rule *rule,
2775                                     const struct nft_rule *prule)
2776 {
2777         struct nlmsghdr *nlh;
2778         struct nfgenmsg *nfmsg;
2779         const struct nft_expr *expr, *next;
2780         struct nlattr *list;
2781         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2782
2783         nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2784         if (nlh == NULL)
2785                 goto nla_put_failure;
2786
2787         nfmsg = nlmsg_data(nlh);
2788         nfmsg->nfgen_family     = family;
2789         nfmsg->version          = NFNETLINK_V0;
2790         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
2791
2792         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2793                 goto nla_put_failure;
2794         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2795                 goto nla_put_failure;
2796         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2797                          NFTA_RULE_PAD))
2798                 goto nla_put_failure;
2799
2800         if (event != NFT_MSG_DELRULE && prule) {
2801                 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2802                                  cpu_to_be64(prule->handle),
2803                                  NFTA_RULE_PAD))
2804                         goto nla_put_failure;
2805         }
2806
2807         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2808         if (list == NULL)
2809                 goto nla_put_failure;
2810         nft_rule_for_each_expr(expr, next, rule) {
2811                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2812                         goto nla_put_failure;
2813         }
2814         nla_nest_end(skb, list);
2815
2816         if (rule->udata) {
2817                 struct nft_userdata *udata = nft_userdata(rule);
2818                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2819                             udata->data) < 0)
2820                         goto nla_put_failure;
2821         }
2822
2823         nlmsg_end(skb, nlh);
2824         return 0;
2825
2826 nla_put_failure:
2827         nlmsg_trim(skb, nlh);
2828         return -1;
2829 }
2830
2831 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2832                                   const struct nft_rule *rule, int event)
2833 {
2834         struct sk_buff *skb;
2835         int err;
2836         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
2837                               ctx->table->name, ctx->table->handle,
2838                               ctx->chain->name, ctx->chain->handle);
2839
2840         audit_log_nfcfg(buf,
2841                         ctx->family,
2842                         rule->handle,
2843                         event == NFT_MSG_NEWRULE ?
2844                                 AUDIT_NFT_OP_RULE_REGISTER :
2845                                 AUDIT_NFT_OP_RULE_UNREGISTER,
2846                         GFP_KERNEL);
2847         kfree(buf);
2848
2849         if (!ctx->report &&
2850             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2851                 return;
2852
2853         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2854         if (skb == NULL)
2855                 goto err;
2856
2857         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2858                                        event, 0, ctx->family, ctx->table,
2859                                        ctx->chain, rule, NULL);
2860         if (err < 0) {
2861                 kfree_skb(skb);
2862                 goto err;
2863         }
2864
2865         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
2866         return;
2867 err:
2868         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2869 }
2870
2871 struct nft_rule_dump_ctx {
2872         char *table;
2873         char *chain;
2874 };
2875
2876 static int __nf_tables_dump_rules(struct sk_buff *skb,
2877                                   unsigned int *idx,
2878                                   struct netlink_callback *cb,
2879                                   const struct nft_table *table,
2880                                   const struct nft_chain *chain)
2881 {
2882         struct net *net = sock_net(skb->sk);
2883         const struct nft_rule *rule, *prule;
2884         unsigned int s_idx = cb->args[0];
2885
2886         prule = NULL;
2887         list_for_each_entry_rcu(rule, &chain->rules, list) {
2888                 if (!nft_is_active(net, rule))
2889                         goto cont_skip;
2890                 if (*idx < s_idx)
2891                         goto cont;
2892                 if (*idx > s_idx) {
2893                         memset(&cb->args[1], 0,
2894                                         sizeof(cb->args) - sizeof(cb->args[0]));
2895                 }
2896                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2897                                         cb->nlh->nlmsg_seq,
2898                                         NFT_MSG_NEWRULE,
2899                                         NLM_F_MULTI | NLM_F_APPEND,
2900                                         table->family,
2901                                         table, chain, rule, prule) < 0)
2902                         return 1;
2903
2904                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2905 cont:
2906                 prule = rule;
2907 cont_skip:
2908                 (*idx)++;
2909         }
2910         return 0;
2911 }
2912
2913 static int nf_tables_dump_rules(struct sk_buff *skb,
2914                                 struct netlink_callback *cb)
2915 {
2916         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2917         const struct nft_rule_dump_ctx *ctx = cb->data;
2918         struct nft_table *table;
2919         const struct nft_chain *chain;
2920         unsigned int idx = 0;
2921         struct net *net = sock_net(skb->sk);
2922         int family = nfmsg->nfgen_family;
2923
2924         rcu_read_lock();
2925         cb->seq = net->nft.base_seq;
2926
2927         list_for_each_entry_rcu(table, &net->nft.tables, list) {
2928                 if (family != NFPROTO_UNSPEC && family != table->family)
2929                         continue;
2930
2931                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2932                         continue;
2933
2934                 if (ctx && ctx->table && ctx->chain) {
2935                         struct rhlist_head *list, *tmp;
2936
2937                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
2938                                                nft_chain_ht_params);
2939                         if (!list)
2940                                 goto done;
2941
2942                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2943                                 if (!nft_is_active(net, chain))
2944                                         continue;
2945                                 __nf_tables_dump_rules(skb, &idx,
2946                                                        cb, table, chain);
2947                                 break;
2948                         }
2949                         goto done;
2950                 }
2951
2952                 list_for_each_entry_rcu(chain, &table->chains, list) {
2953                         if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2954                                 goto done;
2955                 }
2956
2957                 if (ctx && ctx->table)
2958                         break;
2959         }
2960 done:
2961         rcu_read_unlock();
2962
2963         cb->args[0] = idx;
2964         return skb->len;
2965 }
2966
2967 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2968 {
2969         const struct nlattr * const *nla = cb->data;
2970         struct nft_rule_dump_ctx *ctx = NULL;
2971
2972         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2973                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2974                 if (!ctx)
2975                         return -ENOMEM;
2976
2977                 if (nla[NFTA_RULE_TABLE]) {
2978                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2979                                                         GFP_ATOMIC);
2980                         if (!ctx->table) {
2981                                 kfree(ctx);
2982                                 return -ENOMEM;
2983                         }
2984                 }
2985                 if (nla[NFTA_RULE_CHAIN]) {
2986                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2987                                                 GFP_ATOMIC);
2988                         if (!ctx->chain) {
2989                                 kfree(ctx->table);
2990                                 kfree(ctx);
2991                                 return -ENOMEM;
2992                         }
2993                 }
2994         }
2995
2996         cb->data = ctx;
2997         return 0;
2998 }
2999
3000 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3001 {
3002         struct nft_rule_dump_ctx *ctx = cb->data;
3003
3004         if (ctx) {
3005                 kfree(ctx->table);
3006                 kfree(ctx->chain);
3007                 kfree(ctx);
3008         }
3009         return 0;
3010 }
3011
3012 /* called with rcu_read_lock held */
3013 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
3014                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3015                              const struct nlattr * const nla[],
3016                              struct netlink_ext_ack *extack)
3017 {
3018         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3019         u8 genmask = nft_genmask_cur(net);
3020         const struct nft_chain *chain;
3021         const struct nft_rule *rule;
3022         struct nft_table *table;
3023         struct sk_buff *skb2;
3024         int family = nfmsg->nfgen_family;
3025         int err;
3026
3027         if (nlh->nlmsg_flags & NLM_F_DUMP) {
3028                 struct netlink_dump_control c = {
3029                         .start= nf_tables_dump_rules_start,
3030                         .dump = nf_tables_dump_rules,
3031                         .done = nf_tables_dump_rules_done,
3032                         .module = THIS_MODULE,
3033                         .data = (void *)nla,
3034                 };
3035
3036                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3037         }
3038
3039         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3040         if (IS_ERR(table)) {
3041                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3042                 return PTR_ERR(table);
3043         }
3044
3045         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3046         if (IS_ERR(chain)) {
3047                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3048                 return PTR_ERR(chain);
3049         }
3050
3051         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3052         if (IS_ERR(rule)) {
3053                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3054                 return PTR_ERR(rule);
3055         }
3056
3057         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3058         if (!skb2)
3059                 return -ENOMEM;
3060
3061         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3062                                        nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3063                                        family, table, chain, rule, NULL);
3064         if (err < 0)
3065                 goto err_fill_rule_info;
3066
3067         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3068
3069 err_fill_rule_info:
3070         kfree_skb(skb2);
3071         return err;
3072 }
3073
3074 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3075                                    struct nft_rule *rule)
3076 {
3077         struct nft_expr *expr, *next;
3078
3079         /*
3080          * Careful: some expressions might not be initialized in case this
3081          * is called on error from nf_tables_newrule().
3082          */
3083         expr = nft_expr_first(rule);
3084         while (nft_expr_more(rule, expr)) {
3085                 next = nft_expr_next(expr);
3086                 nf_tables_expr_destroy(ctx, expr);
3087                 expr = next;
3088         }
3089         kfree(rule);
3090 }
3091
3092 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3093 {
3094         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3095         nf_tables_rule_destroy(ctx, rule);
3096 }
3097
3098 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3099 {
3100         struct nft_expr *expr, *last;
3101         const struct nft_data *data;
3102         struct nft_rule *rule;
3103         int err;
3104
3105         if (ctx->level == NFT_JUMP_STACK_SIZE)
3106                 return -EMLINK;
3107
3108         list_for_each_entry(rule, &chain->rules, list) {
3109                 if (!nft_is_active_next(ctx->net, rule))
3110                         continue;
3111
3112                 nft_rule_for_each_expr(expr, last, rule) {
3113                         if (!expr->ops->validate)
3114                                 continue;
3115
3116                         err = expr->ops->validate(ctx, expr, &data);
3117                         if (err < 0)
3118                                 return err;
3119                 }
3120         }
3121
3122         return 0;
3123 }
3124 EXPORT_SYMBOL_GPL(nft_chain_validate);
3125
3126 static int nft_table_validate(struct net *net, const struct nft_table *table)
3127 {
3128         struct nft_chain *chain;
3129         struct nft_ctx ctx = {
3130                 .net    = net,
3131                 .family = table->family,
3132         };
3133         int err;
3134
3135         list_for_each_entry(chain, &table->chains, list) {
3136                 if (!nft_is_base_chain(chain))
3137                         continue;
3138
3139                 ctx.chain = chain;
3140                 err = nft_chain_validate(&ctx, chain);
3141                 if (err < 0)
3142                         return err;
3143         }
3144
3145         return 0;
3146 }
3147
3148 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3149                                              const struct nlattr *nla);
3150
3151 #define NFT_RULE_MAXEXPRS       128
3152
3153 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
3154                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3155                              const struct nlattr * const nla[],
3156                              struct netlink_ext_ack *extack)
3157 {
3158         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3159         u8 genmask = nft_genmask_next(net);
3160         struct nft_expr_info *info = NULL;
3161         int family = nfmsg->nfgen_family;
3162         struct nft_flow_rule *flow;
3163         struct nft_table *table;
3164         struct nft_chain *chain;
3165         struct nft_rule *rule, *old_rule = NULL;
3166         struct nft_userdata *udata;
3167         struct nft_trans *trans = NULL;
3168         struct nft_expr *expr;
3169         struct nft_ctx ctx;
3170         struct nlattr *tmp;
3171         unsigned int size, i, n, ulen = 0, usize = 0;
3172         int err, rem;
3173         u64 handle, pos_handle;
3174
3175         lockdep_assert_held(&net->nft.commit_mutex);
3176
3177         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3178         if (IS_ERR(table)) {
3179                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3180                 return PTR_ERR(table);
3181         }
3182
3183         if (nla[NFTA_RULE_CHAIN]) {
3184                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3185                                          genmask);
3186                 if (IS_ERR(chain)) {
3187                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3188                         return PTR_ERR(chain);
3189                 }
3190                 if (nft_chain_is_bound(chain))
3191                         return -EOPNOTSUPP;
3192
3193         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3194                 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3195                 if (IS_ERR(chain)) {
3196                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3197                         return PTR_ERR(chain);
3198                 }
3199         } else {
3200                 return -EINVAL;
3201         }
3202
3203         if (nla[NFTA_RULE_HANDLE]) {
3204                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3205                 rule = __nft_rule_lookup(chain, handle);
3206                 if (IS_ERR(rule)) {
3207                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3208                         return PTR_ERR(rule);
3209                 }
3210
3211                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3212                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3213                         return -EEXIST;
3214                 }
3215                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3216                         old_rule = rule;
3217                 else
3218                         return -EOPNOTSUPP;
3219         } else {
3220                 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
3221                     nlh->nlmsg_flags & NLM_F_REPLACE)
3222                         return -EINVAL;
3223                 handle = nf_tables_alloc_handle(table);
3224
3225                 if (chain->use == UINT_MAX)
3226                         return -EOVERFLOW;
3227
3228                 if (nla[NFTA_RULE_POSITION]) {
3229                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3230                         old_rule = __nft_rule_lookup(chain, pos_handle);
3231                         if (IS_ERR(old_rule)) {
3232                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3233                                 return PTR_ERR(old_rule);
3234                         }
3235                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3236                         old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3237                         if (IS_ERR(old_rule)) {
3238                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3239                                 return PTR_ERR(old_rule);
3240                         }
3241                 }
3242         }
3243
3244         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3245
3246         n = 0;
3247         size = 0;
3248         if (nla[NFTA_RULE_EXPRESSIONS]) {
3249                 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3250                                       sizeof(struct nft_expr_info),
3251                                       GFP_KERNEL);
3252                 if (!info)
3253                         return -ENOMEM;
3254
3255                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3256                         err = -EINVAL;
3257                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3258                                 goto err1;
3259                         if (n == NFT_RULE_MAXEXPRS)
3260                                 goto err1;
3261                         err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
3262                         if (err < 0)
3263                                 goto err1;
3264                         size += info[n].ops->size;
3265                         n++;
3266                 }
3267         }
3268         /* Check for overflow of dlen field */
3269         err = -EFBIG;
3270         if (size >= 1 << 12)
3271                 goto err1;
3272
3273         if (nla[NFTA_RULE_USERDATA]) {
3274                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3275                 if (ulen > 0)
3276                         usize = sizeof(struct nft_userdata) + ulen;
3277         }
3278
3279         err = -ENOMEM;
3280         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3281         if (rule == NULL)
3282                 goto err1;
3283
3284         nft_activate_next(net, rule);
3285
3286         rule->handle = handle;
3287         rule->dlen   = size;
3288         rule->udata  = ulen ? 1 : 0;
3289
3290         if (ulen) {
3291                 udata = nft_userdata(rule);
3292                 udata->len = ulen - 1;
3293                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3294         }
3295
3296         expr = nft_expr_first(rule);
3297         for (i = 0; i < n; i++) {
3298                 err = nf_tables_newexpr(&ctx, &info[i], expr);
3299                 if (err < 0) {
3300                         NL_SET_BAD_ATTR(extack, info[i].attr);
3301                         goto err2;
3302                 }
3303
3304                 if (info[i].ops->validate)
3305                         nft_validate_state_update(net, NFT_VALIDATE_NEED);
3306
3307                 info[i].ops = NULL;
3308                 expr = nft_expr_next(expr);
3309         }
3310
3311         if (nlh->nlmsg_flags & NLM_F_REPLACE) {
3312                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3313                 if (trans == NULL) {
3314                         err = -ENOMEM;
3315                         goto err2;
3316                 }
3317                 err = nft_delrule(&ctx, old_rule);
3318                 if (err < 0) {
3319                         nft_trans_destroy(trans);
3320                         goto err2;
3321                 }
3322
3323                 list_add_tail_rcu(&rule->list, &old_rule->list);
3324         } else {
3325                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3326                 if (!trans) {
3327                         err = -ENOMEM;
3328                         goto err2;
3329                 }
3330
3331                 if (nlh->nlmsg_flags & NLM_F_APPEND) {
3332                         if (old_rule)
3333                                 list_add_rcu(&rule->list, &old_rule->list);
3334                         else
3335                                 list_add_tail_rcu(&rule->list, &chain->rules);
3336                  } else {
3337                         if (old_rule)
3338                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3339                         else
3340                                 list_add_rcu(&rule->list, &chain->rules);
3341                 }
3342         }
3343         kvfree(info);
3344         chain->use++;
3345
3346         if (net->nft.validate_state == NFT_VALIDATE_DO)
3347                 return nft_table_validate(net, table);
3348
3349         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3350                 flow = nft_flow_rule_create(net, rule);
3351                 if (IS_ERR(flow))
3352                         return PTR_ERR(flow);
3353
3354                 nft_trans_flow_rule(trans) = flow;
3355         }
3356
3357         return 0;
3358 err2:
3359         nf_tables_rule_release(&ctx, rule);
3360 err1:
3361         for (i = 0; i < n; i++) {
3362                 if (info[i].ops) {
3363                         module_put(info[i].ops->type->owner);
3364                         if (info[i].ops->type->release_ops)
3365                                 info[i].ops->type->release_ops(info[i].ops);
3366                 }
3367         }
3368         kvfree(info);
3369         return err;
3370 }
3371
3372 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3373                                              const struct nlattr *nla)
3374 {
3375         u32 id = ntohl(nla_get_be32(nla));
3376         struct nft_trans *trans;
3377
3378         list_for_each_entry(trans, &net->nft.commit_list, list) {
3379                 struct nft_rule *rule = nft_trans_rule(trans);
3380
3381                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3382                     id == nft_trans_rule_id(trans))
3383                         return rule;
3384         }
3385         return ERR_PTR(-ENOENT);
3386 }
3387
3388 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
3389                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3390                              const struct nlattr * const nla[],
3391                              struct netlink_ext_ack *extack)
3392 {
3393         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3394         u8 genmask = nft_genmask_next(net);
3395         struct nft_table *table;
3396         struct nft_chain *chain = NULL;
3397         struct nft_rule *rule;
3398         int family = nfmsg->nfgen_family, err = 0;
3399         struct nft_ctx ctx;
3400
3401         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3402         if (IS_ERR(table)) {
3403                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3404                 return PTR_ERR(table);
3405         }
3406
3407         if (nla[NFTA_RULE_CHAIN]) {
3408                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3409                                          genmask);
3410                 if (IS_ERR(chain)) {
3411                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3412                         return PTR_ERR(chain);
3413                 }
3414                 if (nft_chain_is_bound(chain))
3415                         return -EOPNOTSUPP;
3416         }
3417
3418         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3419
3420         if (chain) {
3421                 if (nla[NFTA_RULE_HANDLE]) {
3422                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3423                         if (IS_ERR(rule)) {
3424                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3425                                 return PTR_ERR(rule);
3426                         }
3427
3428                         err = nft_delrule(&ctx, rule);
3429                 } else if (nla[NFTA_RULE_ID]) {
3430                         rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3431                         if (IS_ERR(rule)) {
3432                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3433                                 return PTR_ERR(rule);
3434                         }
3435
3436                         err = nft_delrule(&ctx, rule);
3437                 } else {
3438                         err = nft_delrule_by_chain(&ctx);
3439                 }
3440         } else {
3441                 list_for_each_entry(chain, &table->chains, list) {
3442                         if (!nft_is_active_next(net, chain))
3443                                 continue;
3444
3445                         ctx.chain = chain;
3446                         err = nft_delrule_by_chain(&ctx);
3447                         if (err < 0)
3448                                 break;
3449                 }
3450         }
3451
3452         return err;
3453 }
3454
3455 /*
3456  * Sets
3457  */
3458 static const struct nft_set_type *nft_set_types[] = {
3459         &nft_set_hash_fast_type,
3460         &nft_set_hash_type,
3461         &nft_set_rhash_type,
3462         &nft_set_bitmap_type,
3463         &nft_set_rbtree_type,
3464 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3465         &nft_set_pipapo_avx2_type,
3466 #endif
3467         &nft_set_pipapo_type,
3468 };
3469
3470 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3471                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3472                                  NFT_SET_EVAL)
3473
3474 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3475 {
3476         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3477 }
3478
3479 /*
3480  * Select a set implementation based on the data characteristics and the
3481  * given policy. The total memory use might not be known if no size is
3482  * given, in that case the amount of memory per element is used.
3483  */
3484 static const struct nft_set_ops *
3485 nft_select_set_ops(const struct nft_ctx *ctx,
3486                    const struct nlattr * const nla[],
3487                    const struct nft_set_desc *desc,
3488                    enum nft_set_policies policy)
3489 {
3490         const struct nft_set_ops *ops, *bops;
3491         struct nft_set_estimate est, best;
3492         const struct nft_set_type *type;
3493         u32 flags = 0;
3494         int i;
3495
3496         lockdep_assert_held(&ctx->net->nft.commit_mutex);
3497         lockdep_nfnl_nft_mutex_not_held();
3498
3499         if (nla[NFTA_SET_FLAGS] != NULL)
3500                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3501
3502         bops        = NULL;
3503         best.size   = ~0;
3504         best.lookup = ~0;
3505         best.space  = ~0;
3506
3507         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3508                 type = nft_set_types[i];
3509                 ops = &type->ops;
3510
3511                 if (!nft_set_ops_candidate(type, flags))
3512                         continue;
3513                 if (!ops->estimate(desc, flags, &est))
3514                         continue;
3515
3516                 switch (policy) {
3517                 case NFT_SET_POL_PERFORMANCE:
3518                         if (est.lookup < best.lookup)
3519                                 break;
3520                         if (est.lookup == best.lookup &&
3521                             est.space < best.space)
3522                                 break;
3523                         continue;
3524                 case NFT_SET_POL_MEMORY:
3525                         if (!desc->size) {
3526                                 if (est.space < best.space)
3527                                         break;
3528                                 if (est.space == best.space &&
3529                                     est.lookup < best.lookup)
3530                                         break;
3531                         } else if (est.size < best.size || !bops) {
3532                                 break;
3533                         }
3534                         continue;
3535                 default:
3536                         break;
3537                 }
3538
3539                 bops = ops;
3540                 best = est;
3541         }
3542
3543         if (bops != NULL)
3544                 return bops;
3545
3546         return ERR_PTR(-EOPNOTSUPP);
3547 }
3548
3549 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3550         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3551                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3552         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3553                                             .len = NFT_SET_MAXNAMELEN - 1 },
3554         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3555         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3556         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3557         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3558         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3559         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3560         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3561         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3562         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3563         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3564         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3565                                             .len  = NFT_USERDATA_MAXLEN },
3566         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3567         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3568         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3569 };
3570
3571 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3572         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3573         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3574 };
3575
3576 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
3577                                      const struct sk_buff *skb,
3578                                      const struct nlmsghdr *nlh,
3579                                      const struct nlattr * const nla[],
3580                                      struct netlink_ext_ack *extack,
3581                                      u8 genmask)
3582 {
3583         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3584         int family = nfmsg->nfgen_family;
3585         struct nft_table *table = NULL;
3586
3587         if (nla[NFTA_SET_TABLE] != NULL) {
3588                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3589                                          genmask);
3590                 if (IS_ERR(table)) {
3591                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3592                         return PTR_ERR(table);
3593                 }
3594         }
3595
3596         nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3597         return 0;
3598 }
3599
3600 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3601                                       const struct nlattr *nla, u8 genmask)
3602 {
3603         struct nft_set *set;
3604
3605         if (nla == NULL)
3606                 return ERR_PTR(-EINVAL);
3607
3608         list_for_each_entry_rcu(set, &table->sets, list) {
3609                 if (!nla_strcmp(nla, set->name) &&
3610                     nft_active_genmask(set, genmask))
3611                         return set;
3612         }
3613         return ERR_PTR(-ENOENT);
3614 }
3615
3616 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3617                                                const struct nlattr *nla,
3618                                                u8 genmask)
3619 {
3620         struct nft_set *set;
3621
3622         list_for_each_entry(set, &table->sets, list) {
3623                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3624                     nft_active_genmask(set, genmask))
3625                         return set;
3626         }
3627         return ERR_PTR(-ENOENT);
3628 }
3629
3630 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3631                                            const struct nlattr *nla, u8 genmask)
3632 {
3633         struct nft_trans *trans;
3634         u32 id = ntohl(nla_get_be32(nla));
3635
3636         list_for_each_entry(trans, &net->nft.commit_list, list) {
3637                 if (trans->msg_type == NFT_MSG_NEWSET) {
3638                         struct nft_set *set = nft_trans_set(trans);
3639
3640                         if (id == nft_trans_set_id(trans) &&
3641                             nft_active_genmask(set, genmask))
3642                                 return set;
3643                 }
3644         }
3645         return ERR_PTR(-ENOENT);
3646 }
3647
3648 struct nft_set *nft_set_lookup_global(const struct net *net,
3649                                       const struct nft_table *table,
3650                                       const struct nlattr *nla_set_name,
3651                                       const struct nlattr *nla_set_id,
3652                                       u8 genmask)
3653 {
3654         struct nft_set *set;
3655
3656         set = nft_set_lookup(table, nla_set_name, genmask);
3657         if (IS_ERR(set)) {
3658                 if (!nla_set_id)
3659                         return set;
3660
3661                 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3662         }
3663         return set;
3664 }
3665 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3666
3667 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3668                                     const char *name)
3669 {
3670         const struct nft_set *i;
3671         const char *p;
3672         unsigned long *inuse;
3673         unsigned int n = 0, min = 0;
3674
3675         p = strchr(name, '%');
3676         if (p != NULL) {
3677                 if (p[1] != 'd' || strchr(p + 2, '%'))
3678                         return -EINVAL;
3679
3680                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3681                 if (inuse == NULL)
3682                         return -ENOMEM;
3683 cont:
3684                 list_for_each_entry(i, &ctx->table->sets, list) {
3685                         int tmp;
3686
3687                         if (!nft_is_active_next(ctx->net, set))
3688                                 continue;
3689                         if (!sscanf(i->name, name, &tmp))
3690                                 continue;
3691                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3692                                 continue;
3693
3694                         set_bit(tmp - min, inuse);
3695                 }
3696
3697                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3698                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3699                         min += BITS_PER_BYTE * PAGE_SIZE;
3700                         memset(inuse, 0, PAGE_SIZE);
3701                         goto cont;
3702                 }
3703                 free_page((unsigned long)inuse);
3704         }
3705
3706         set->name = kasprintf(GFP_KERNEL, name, min + n);
3707         if (!set->name)
3708                 return -ENOMEM;
3709
3710         list_for_each_entry(i, &ctx->table->sets, list) {
3711                 if (!nft_is_active_next(ctx->net, i))
3712                         continue;
3713                 if (!strcmp(set->name, i->name)) {
3714                         kfree(set->name);
3715                         set->name = NULL;
3716                         return -ENFILE;
3717                 }
3718         }
3719         return 0;
3720 }
3721
3722 static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3723 {
3724         u64 ms = be64_to_cpu(nla_get_be64(nla));
3725         u64 max = (u64)(~((u64)0));
3726
3727         max = div_u64(max, NSEC_PER_MSEC);
3728         if (ms >= max)
3729                 return -ERANGE;
3730
3731         ms *= NSEC_PER_MSEC;
3732         *result = nsecs_to_jiffies64(ms);
3733         return 0;
3734 }
3735
3736 static __be64 nf_jiffies64_to_msecs(u64 input)
3737 {
3738         return cpu_to_be64(jiffies64_to_msecs(input));
3739 }
3740
3741 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3742                                      const struct nft_set *set)
3743 {
3744         struct nlattr *concat, *field;
3745         int i;
3746
3747         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3748         if (!concat)
3749                 return -ENOMEM;
3750
3751         for (i = 0; i < set->field_count; i++) {
3752                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3753                 if (!field)
3754                         return -ENOMEM;
3755
3756                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3757                                  htonl(set->field_len[i])))
3758                         return -ENOMEM;
3759
3760                 nla_nest_end(skb, field);
3761         }
3762
3763         nla_nest_end(skb, concat);
3764
3765         return 0;
3766 }
3767
3768 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3769                               const struct nft_set *set, u16 event, u16 flags)
3770 {
3771         struct nfgenmsg *nfmsg;
3772         struct nlmsghdr *nlh;
3773         u32 portid = ctx->portid;
3774         struct nlattr *nest;
3775         u32 seq = ctx->seq;
3776
3777         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3778         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3779                         flags);
3780         if (nlh == NULL)
3781                 goto nla_put_failure;
3782
3783         nfmsg = nlmsg_data(nlh);
3784         nfmsg->nfgen_family     = ctx->family;
3785         nfmsg->version          = NFNETLINK_V0;
3786         nfmsg->res_id           = htons(ctx->net->nft.base_seq & 0xffff);
3787
3788         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3789                 goto nla_put_failure;
3790         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3791                 goto nla_put_failure;
3792         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3793                          NFTA_SET_PAD))
3794                 goto nla_put_failure;
3795         if (set->flags != 0)
3796                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3797                         goto nla_put_failure;
3798
3799         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3800                 goto nla_put_failure;
3801         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3802                 goto nla_put_failure;
3803         if (set->flags & NFT_SET_MAP) {
3804                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3805                         goto nla_put_failure;
3806                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3807                         goto nla_put_failure;
3808         }
3809         if (set->flags & NFT_SET_OBJECT &&
3810             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3811                 goto nla_put_failure;
3812
3813         if (set->timeout &&
3814             nla_put_be64(skb, NFTA_SET_TIMEOUT,
3815                          nf_jiffies64_to_msecs(set->timeout),
3816                          NFTA_SET_PAD))
3817                 goto nla_put_failure;
3818         if (set->gc_int &&
3819             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3820                 goto nla_put_failure;
3821
3822         if (set->policy != NFT_SET_POL_PERFORMANCE) {
3823                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3824                         goto nla_put_failure;
3825         }
3826
3827         if (set->udata &&
3828             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3829                 goto nla_put_failure;
3830
3831         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3832         if (!nest)
3833                 goto nla_put_failure;
3834         if (set->size &&
3835             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3836                 goto nla_put_failure;
3837
3838         if (set->field_count > 1 &&
3839             nf_tables_fill_set_concat(skb, set))
3840                 goto nla_put_failure;
3841
3842         nla_nest_end(skb, nest);
3843
3844         if (set->expr) {
3845                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3846                 if (nf_tables_fill_expr_info(skb, set->expr) < 0)
3847                         goto nla_put_failure;
3848
3849                 nla_nest_end(skb, nest);
3850         }
3851
3852         nlmsg_end(skb, nlh);
3853         return 0;
3854
3855 nla_put_failure:
3856         nlmsg_trim(skb, nlh);
3857         return -1;
3858 }
3859
3860 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3861                                  const struct nft_set *set, int event,
3862                                  gfp_t gfp_flags)
3863 {
3864         struct sk_buff *skb;
3865         u32 portid = ctx->portid;
3866         int err;
3867         char *buf = kasprintf(gfp_flags, "%s:%llu;%s:%llu",
3868                               ctx->table->name, ctx->table->handle,
3869                               set->name, set->handle);
3870
3871         audit_log_nfcfg(buf,
3872                         ctx->family,
3873                         set->field_count,
3874                         event == NFT_MSG_NEWSET ?
3875                                 AUDIT_NFT_OP_SET_REGISTER :
3876                                 AUDIT_NFT_OP_SET_UNREGISTER,
3877                         gfp_flags);
3878         kfree(buf);
3879
3880         if (!ctx->report &&
3881             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3882                 return;
3883
3884         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3885         if (skb == NULL)
3886                 goto err;
3887
3888         err = nf_tables_fill_set(skb, ctx, set, event, 0);
3889         if (err < 0) {
3890                 kfree_skb(skb);
3891                 goto err;
3892         }
3893
3894         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
3895         return;
3896 err:
3897         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3898 }
3899
3900 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3901 {
3902         const struct nft_set *set;
3903         unsigned int idx, s_idx = cb->args[0];
3904         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3905         struct net *net = sock_net(skb->sk);
3906         struct nft_ctx *ctx = cb->data, ctx_set;
3907
3908         if (cb->args[1])
3909                 return skb->len;
3910
3911         rcu_read_lock();
3912         cb->seq = net->nft.base_seq;
3913
3914         list_for_each_entry_rcu(table, &net->nft.tables, list) {
3915                 if (ctx->family != NFPROTO_UNSPEC &&
3916                     ctx->family != table->family)
3917                         continue;
3918
3919                 if (ctx->table && ctx->table != table)
3920                         continue;
3921
3922                 if (cur_table) {
3923                         if (cur_table != table)
3924                                 continue;
3925
3926                         cur_table = NULL;
3927                 }
3928                 idx = 0;
3929                 list_for_each_entry_rcu(set, &table->sets, list) {
3930                         if (idx < s_idx)
3931                                 goto cont;
3932                         if (!nft_is_active(net, set))
3933                                 goto cont;
3934
3935                         ctx_set = *ctx;
3936                         ctx_set.table = table;
3937                         ctx_set.family = table->family;
3938
3939                         if (nf_tables_fill_set(skb, &ctx_set, set,
3940                                                NFT_MSG_NEWSET,
3941                                                NLM_F_MULTI) < 0) {
3942                                 cb->args[0] = idx;
3943                                 cb->args[2] = (unsigned long) table;
3944                                 goto done;
3945                         }
3946                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3947 cont:
3948                         idx++;
3949                 }
3950                 if (s_idx)
3951                         s_idx = 0;
3952         }
3953         cb->args[1] = 1;
3954 done:
3955         rcu_read_unlock();
3956         return skb->len;
3957 }
3958
3959 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3960 {
3961         struct nft_ctx *ctx_dump = NULL;
3962
3963         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3964         if (ctx_dump == NULL)
3965                 return -ENOMEM;
3966
3967         cb->data = ctx_dump;
3968         return 0;
3969 }
3970
3971 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3972 {
3973         kfree(cb->data);
3974         return 0;
3975 }
3976
3977 /* called with rcu_read_lock held */
3978 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3979                             struct sk_buff *skb, const struct nlmsghdr *nlh,
3980                             const struct nlattr * const nla[],
3981                             struct netlink_ext_ack *extack)
3982 {
3983         u8 genmask = nft_genmask_cur(net);
3984         const struct nft_set *set;
3985         struct nft_ctx ctx;
3986         struct sk_buff *skb2;
3987         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3988         int err;
3989
3990         /* Verify existence before starting dump */
3991         err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3992                                         genmask);
3993         if (err < 0)
3994                 return err;
3995
3996         if (nlh->nlmsg_flags & NLM_F_DUMP) {
3997                 struct netlink_dump_control c = {
3998                         .start = nf_tables_dump_sets_start,
3999                         .dump = nf_tables_dump_sets,
4000                         .done = nf_tables_dump_sets_done,
4001                         .data = &ctx,
4002                         .module = THIS_MODULE,
4003                 };
4004
4005                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4006         }
4007
4008         /* Only accept unspec with dump */
4009         if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4010                 return -EAFNOSUPPORT;
4011         if (!nla[NFTA_SET_TABLE])
4012                 return -EINVAL;
4013
4014         set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
4015         if (IS_ERR(set))
4016                 return PTR_ERR(set);
4017
4018         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4019         if (skb2 == NULL)
4020                 return -ENOMEM;
4021
4022         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4023         if (err < 0)
4024                 goto err_fill_set_info;
4025
4026         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4027
4028 err_fill_set_info:
4029         kfree_skb(skb2);
4030         return err;
4031 }
4032
4033 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4034         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4035 };
4036
4037 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4038                                      struct nft_set_desc *desc)
4039 {
4040         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4041         u32 len;
4042         int err;
4043
4044         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4045                                           nft_concat_policy, NULL);
4046         if (err < 0)
4047                 return err;
4048
4049         if (!tb[NFTA_SET_FIELD_LEN])
4050                 return -EINVAL;
4051
4052         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4053
4054         if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
4055                 return -E2BIG;
4056
4057         desc->field_len[desc->field_count++] = len;
4058
4059         return 0;
4060 }
4061
4062 static int nft_set_desc_concat(struct nft_set_desc *desc,
4063                                const struct nlattr *nla)
4064 {
4065         struct nlattr *attr;
4066         int rem, err;
4067
4068         nla_for_each_nested(attr, nla, rem) {
4069                 if (nla_type(attr) != NFTA_LIST_ELEM)
4070                         return -EINVAL;
4071
4072                 err = nft_set_desc_concat_parse(attr, desc);
4073                 if (err < 0)
4074                         return err;
4075         }
4076
4077         return 0;
4078 }
4079
4080 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4081                                     const struct nlattr *nla)
4082 {
4083         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4084         int err;
4085
4086         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4087                                           nft_set_desc_policy, NULL);
4088         if (err < 0)
4089                 return err;
4090
4091         if (da[NFTA_SET_DESC_SIZE] != NULL)
4092                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4093         if (da[NFTA_SET_DESC_CONCAT])
4094                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4095
4096         return err;
4097 }
4098
4099 static int nf_tables_newset(struct net *net, struct sock *nlsk,
4100                             struct sk_buff *skb, const struct nlmsghdr *nlh,
4101                             const struct nlattr * const nla[],
4102                             struct netlink_ext_ack *extack)
4103 {
4104         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4105         u8 genmask = nft_genmask_next(net);
4106         int family = nfmsg->nfgen_family;
4107         const struct nft_set_ops *ops;
4108         struct nft_expr *expr = NULL;
4109         struct nft_table *table;
4110         struct nft_set *set;
4111         struct nft_ctx ctx;
4112         char *name;
4113         u64 size;
4114         u64 timeout;
4115         u32 ktype, dtype, flags, policy, gc_int, objtype;
4116         struct nft_set_desc desc;
4117         unsigned char *udata;
4118         u16 udlen;
4119         int err;
4120         int i;
4121
4122         if (nla[NFTA_SET_TABLE] == NULL ||
4123             nla[NFTA_SET_NAME] == NULL ||
4124             nla[NFTA_SET_KEY_LEN] == NULL ||
4125             nla[NFTA_SET_ID] == NULL)
4126                 return -EINVAL;
4127
4128         memset(&desc, 0, sizeof(desc));
4129
4130         ktype = NFT_DATA_VALUE;
4131         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4132                 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4133                 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4134                         return -EINVAL;
4135         }
4136
4137         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4138         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4139                 return -EINVAL;
4140
4141         flags = 0;
4142         if (nla[NFTA_SET_FLAGS] != NULL) {
4143                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4144                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4145                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4146                               NFT_SET_MAP | NFT_SET_EVAL |
4147                               NFT_SET_OBJECT | NFT_SET_CONCAT))
4148                         return -EOPNOTSUPP;
4149                 /* Only one of these operations is supported */
4150                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4151                              (NFT_SET_MAP | NFT_SET_OBJECT))
4152                         return -EOPNOTSUPP;
4153                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4154                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4155                         return -EOPNOTSUPP;
4156         }
4157
4158         dtype = 0;
4159         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4160                 if (!(flags & NFT_SET_MAP))
4161                         return -EINVAL;
4162
4163                 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4164                 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4165                     dtype != NFT_DATA_VERDICT)
4166                         return -EINVAL;
4167
4168                 if (dtype != NFT_DATA_VERDICT) {
4169                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4170                                 return -EINVAL;
4171                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4172                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4173                                 return -EINVAL;
4174                 } else
4175                         desc.dlen = sizeof(struct nft_verdict);
4176         } else if (flags & NFT_SET_MAP)
4177                 return -EINVAL;
4178
4179         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4180                 if (!(flags & NFT_SET_OBJECT))
4181                         return -EINVAL;
4182
4183                 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4184                 if (objtype == NFT_OBJECT_UNSPEC ||
4185                     objtype > NFT_OBJECT_MAX)
4186                         return -EOPNOTSUPP;
4187         } else if (flags & NFT_SET_OBJECT)
4188                 return -EINVAL;
4189         else
4190                 objtype = NFT_OBJECT_UNSPEC;
4191
4192         timeout = 0;
4193         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4194                 if (!(flags & NFT_SET_TIMEOUT))
4195                         return -EINVAL;
4196
4197                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4198                 if (err)
4199                         return err;
4200         }
4201         gc_int = 0;
4202         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4203                 if (!(flags & NFT_SET_TIMEOUT))
4204                         return -EINVAL;
4205                 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4206         }
4207
4208         policy = NFT_SET_POL_PERFORMANCE;
4209         if (nla[NFTA_SET_POLICY] != NULL)
4210                 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4211
4212         if (nla[NFTA_SET_DESC] != NULL) {
4213                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4214                 if (err < 0)
4215                         return err;
4216         }
4217
4218         if (nla[NFTA_SET_EXPR])
4219                 desc.expr = true;
4220
4221         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
4222         if (IS_ERR(table)) {
4223                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4224                 return PTR_ERR(table);
4225         }
4226
4227         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
4228
4229         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4230         if (IS_ERR(set)) {
4231                 if (PTR_ERR(set) != -ENOENT) {
4232                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4233                         return PTR_ERR(set);
4234                 }
4235         } else {
4236                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
4237                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4238                         return -EEXIST;
4239                 }
4240                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
4241                         return -EOPNOTSUPP;
4242
4243                 return 0;
4244         }
4245
4246         if (!(nlh->nlmsg_flags & NLM_F_CREATE))
4247                 return -ENOENT;
4248
4249         ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4250         if (IS_ERR(ops))
4251                 return PTR_ERR(ops);
4252
4253         udlen = 0;
4254         if (nla[NFTA_SET_USERDATA])
4255                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4256
4257         size = 0;
4258         if (ops->privsize != NULL)
4259                 size = ops->privsize(nla, &desc);
4260
4261         set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
4262         if (!set)
4263                 return -ENOMEM;
4264
4265         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4266         if (!name) {
4267                 err = -ENOMEM;
4268                 goto err_set_name;
4269         }
4270
4271         err = nf_tables_set_alloc_name(&ctx, set, name);
4272         kfree(name);
4273         if (err < 0)
4274                 goto err_set_alloc_name;
4275
4276         if (nla[NFTA_SET_EXPR]) {
4277                 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4278                 if (IS_ERR(expr)) {
4279                         err = PTR_ERR(expr);
4280                         goto err_set_alloc_name;
4281                 }
4282         }
4283
4284         udata = NULL;
4285         if (udlen) {
4286                 udata = set->data + size;
4287                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4288         }
4289
4290         INIT_LIST_HEAD(&set->bindings);
4291         set->table = table;
4292         write_pnet(&set->net, net);
4293         set->ops   = ops;
4294         set->ktype = ktype;
4295         set->klen  = desc.klen;
4296         set->dtype = dtype;
4297         set->objtype = objtype;
4298         set->dlen  = desc.dlen;
4299         set->expr = expr;
4300         set->flags = flags;
4301         set->size  = desc.size;
4302         set->policy = policy;
4303         set->udlen  = udlen;
4304         set->udata  = udata;
4305         set->timeout = timeout;
4306         set->gc_int = gc_int;
4307         set->handle = nf_tables_alloc_handle(table);
4308
4309         set->field_count = desc.field_count;
4310         for (i = 0; i < desc.field_count; i++)
4311                 set->field_len[i] = desc.field_len[i];
4312
4313         err = ops->init(set, &desc, nla);
4314         if (err < 0)
4315                 goto err_set_init;
4316
4317         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4318         if (err < 0)
4319                 goto err_set_trans;
4320
4321         list_add_tail_rcu(&set->list, &table->sets);
4322         table->use++;
4323         return 0;
4324
4325 err_set_trans:
4326         ops->destroy(set);
4327 err_set_init:
4328         if (expr)
4329                 nft_expr_destroy(&ctx, expr);
4330 err_set_alloc_name:
4331         kfree(set->name);
4332 err_set_name:
4333         kvfree(set);
4334         return err;
4335 }
4336
4337 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4338 {
4339         if (WARN_ON(set->use > 0))
4340                 return;
4341
4342         if (set->expr)
4343                 nft_expr_destroy(ctx, set->expr);
4344
4345         set->ops->destroy(set);
4346         kfree(set->name);
4347         kvfree(set);
4348 }
4349
4350 static int nf_tables_delset(struct net *net, struct sock *nlsk,
4351                             struct sk_buff *skb, const struct nlmsghdr *nlh,
4352                             const struct nlattr * const nla[],
4353                             struct netlink_ext_ack *extack)
4354 {
4355         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4356         u8 genmask = nft_genmask_next(net);
4357         const struct nlattr *attr;
4358         struct nft_set *set;
4359         struct nft_ctx ctx;
4360         int err;
4361
4362         if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4363                 return -EAFNOSUPPORT;
4364         if (nla[NFTA_SET_TABLE] == NULL)
4365                 return -EINVAL;
4366
4367         err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
4368                                         genmask);
4369         if (err < 0)
4370                 return err;
4371
4372         if (nla[NFTA_SET_HANDLE]) {
4373                 attr = nla[NFTA_SET_HANDLE];
4374                 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
4375         } else {
4376                 attr = nla[NFTA_SET_NAME];
4377                 set = nft_set_lookup(ctx.table, attr, genmask);
4378         }
4379
4380         if (IS_ERR(set)) {
4381                 NL_SET_BAD_ATTR(extack, attr);
4382                 return PTR_ERR(set);
4383         }
4384         if (set->use ||
4385             (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
4386                 NL_SET_BAD_ATTR(extack, attr);
4387                 return -EBUSY;
4388         }
4389
4390         return nft_delset(&ctx, set);
4391 }
4392
4393 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4394                                         struct nft_set *set,
4395                                         const struct nft_set_iter *iter,
4396                                         struct nft_set_elem *elem)
4397 {
4398         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4399         enum nft_registers dreg;
4400
4401         dreg = nft_type_to_reg(set->dtype);
4402         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4403                                            set->dtype == NFT_DATA_VERDICT ?
4404                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4405                                            set->dlen);
4406 }
4407
4408 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4409                        struct nft_set_binding *binding)
4410 {
4411         struct nft_set_binding *i;
4412         struct nft_set_iter iter;
4413
4414         if (set->use == UINT_MAX)
4415                 return -EOVERFLOW;
4416
4417         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4418                 return -EBUSY;
4419
4420         if (binding->flags & NFT_SET_MAP) {
4421                 /* If the set is already bound to the same chain all
4422                  * jumps are already validated for that chain.
4423                  */
4424                 list_for_each_entry(i, &set->bindings, list) {
4425                         if (i->flags & NFT_SET_MAP &&
4426                             i->chain == binding->chain)
4427                                 goto bind;
4428                 }
4429
4430                 iter.genmask    = nft_genmask_next(ctx->net);
4431                 iter.skip       = 0;
4432                 iter.count      = 0;
4433                 iter.err        = 0;
4434                 iter.fn         = nf_tables_bind_check_setelem;
4435
4436                 set->ops->walk(ctx, set, &iter);
4437                 if (iter.err < 0)
4438                         return iter.err;
4439         }
4440 bind:
4441         binding->chain = ctx->chain;
4442         list_add_tail_rcu(&binding->list, &set->bindings);
4443         nft_set_trans_bind(ctx, set);
4444         set->use++;
4445
4446         return 0;
4447 }
4448 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4449
4450 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4451                                  struct nft_set_binding *binding, bool event)
4452 {
4453         list_del_rcu(&binding->list);
4454
4455         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4456                 list_del_rcu(&set->list);
4457                 if (event)
4458                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4459                                              GFP_KERNEL);
4460         }
4461 }
4462
4463 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4464                               struct nft_set_binding *binding,
4465                               enum nft_trans_phase phase)
4466 {
4467         switch (phase) {
4468         case NFT_TRANS_PREPARE:
4469                 set->use--;
4470                 return;
4471         case NFT_TRANS_ABORT:
4472         case NFT_TRANS_RELEASE:
4473                 set->use--;
4474                 fallthrough;
4475         default:
4476                 nf_tables_unbind_set(ctx, set, binding,
4477                                      phase == NFT_TRANS_COMMIT);
4478         }
4479 }
4480 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4481
4482 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4483 {
4484         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4485                 nft_set_destroy(ctx, set);
4486 }
4487 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4488
4489 const struct nft_set_ext_type nft_set_ext_types[] = {
4490         [NFT_SET_EXT_KEY]               = {
4491                 .align  = __alignof__(u32),
4492         },
4493         [NFT_SET_EXT_DATA]              = {
4494                 .align  = __alignof__(u32),
4495         },
4496         [NFT_SET_EXT_EXPR]              = {
4497                 .align  = __alignof__(struct nft_expr),
4498         },
4499         [NFT_SET_EXT_OBJREF]            = {
4500                 .len    = sizeof(struct nft_object *),
4501                 .align  = __alignof__(struct nft_object *),
4502         },
4503         [NFT_SET_EXT_FLAGS]             = {
4504                 .len    = sizeof(u8),
4505                 .align  = __alignof__(u8),
4506         },
4507         [NFT_SET_EXT_TIMEOUT]           = {
4508                 .len    = sizeof(u64),
4509                 .align  = __alignof__(u64),
4510         },
4511         [NFT_SET_EXT_EXPIRATION]        = {
4512                 .len    = sizeof(u64),
4513                 .align  = __alignof__(u64),
4514         },
4515         [NFT_SET_EXT_USERDATA]          = {
4516                 .len    = sizeof(struct nft_userdata),
4517                 .align  = __alignof__(struct nft_userdata),
4518         },
4519         [NFT_SET_EXT_KEY_END]           = {
4520                 .align  = __alignof__(u32),
4521         },
4522 };
4523
4524 /*
4525  * Set elements
4526  */
4527
4528 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4529         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
4530         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
4531         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
4532         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
4533         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
4534         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
4535                                             .len = NFT_USERDATA_MAXLEN },
4536         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
4537         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
4538                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
4539         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
4540 };
4541
4542 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4543         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
4544                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4545         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
4546                                             .len = NFT_SET_MAXNAMELEN - 1 },
4547         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
4548         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
4549 };
4550
4551 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
4552                                       const struct sk_buff *skb,
4553                                       const struct nlmsghdr *nlh,
4554                                       const struct nlattr * const nla[],
4555                                       struct netlink_ext_ack *extack,
4556                                       u8 genmask)
4557 {
4558         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4559         int family = nfmsg->nfgen_family;
4560         struct nft_table *table;
4561
4562         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
4563                                  genmask);
4564         if (IS_ERR(table)) {
4565                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
4566                 return PTR_ERR(table);
4567         }
4568
4569         nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
4570         return 0;
4571 }
4572
4573 static int nf_tables_fill_setelem(struct sk_buff *skb,
4574                                   const struct nft_set *set,
4575                                   const struct nft_set_elem *elem)
4576 {
4577         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4578         unsigned char *b = skb_tail_pointer(skb);
4579         struct nlattr *nest;
4580
4581         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4582         if (nest == NULL)
4583                 goto nla_put_failure;
4584
4585         if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4586                           NFT_DATA_VALUE, set->klen) < 0)
4587                 goto nla_put_failure;
4588
4589         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4590             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4591                           NFT_DATA_VALUE, set->klen) < 0)
4592                 goto nla_put_failure;
4593
4594         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4595             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4596                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4597                           set->dlen) < 0)
4598                 goto nla_put_failure;
4599
4600         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
4601             nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
4602                 goto nla_put_failure;
4603
4604         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4605             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4606                            (*nft_set_ext_obj(ext))->key.name) < 0)
4607                 goto nla_put_failure;
4608
4609         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4610             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4611                          htonl(*nft_set_ext_flags(ext))))
4612                 goto nla_put_failure;
4613
4614         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4615             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4616                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4617                          NFTA_SET_ELEM_PAD))
4618                 goto nla_put_failure;
4619
4620         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4621                 u64 expires, now = get_jiffies_64();
4622
4623                 expires = *nft_set_ext_expiration(ext);
4624                 if (time_before64(now, expires))
4625                         expires -= now;
4626                 else
4627                         expires = 0;
4628
4629                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4630                                  nf_jiffies64_to_msecs(expires),
4631                                  NFTA_SET_ELEM_PAD))
4632                         goto nla_put_failure;
4633         }
4634
4635         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4636                 struct nft_userdata *udata;
4637
4638                 udata = nft_set_ext_userdata(ext);
4639                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4640                             udata->len + 1, udata->data))
4641                         goto nla_put_failure;
4642         }
4643
4644         nla_nest_end(skb, nest);
4645         return 0;
4646
4647 nla_put_failure:
4648         nlmsg_trim(skb, b);
4649         return -EMSGSIZE;
4650 }
4651
4652 struct nft_set_dump_args {
4653         const struct netlink_callback   *cb;
4654         struct nft_set_iter             iter;
4655         struct sk_buff                  *skb;
4656 };
4657
4658 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4659                                   struct nft_set *set,
4660                                   const struct nft_set_iter *iter,
4661                                   struct nft_set_elem *elem)
4662 {
4663         struct nft_set_dump_args *args;
4664
4665         args = container_of(iter, struct nft_set_dump_args, iter);
4666         return nf_tables_fill_setelem(args->skb, set, elem);
4667 }
4668
4669 struct nft_set_dump_ctx {
4670         const struct nft_set    *set;
4671         struct nft_ctx          ctx;
4672 };
4673
4674 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4675 {
4676         struct nft_set_dump_ctx *dump_ctx = cb->data;
4677         struct net *net = sock_net(skb->sk);
4678         struct nft_table *table;
4679         struct nft_set *set;
4680         struct nft_set_dump_args args;
4681         bool set_found = false;
4682         struct nfgenmsg *nfmsg;
4683         struct nlmsghdr *nlh;
4684         struct nlattr *nest;
4685         u32 portid, seq;
4686         int event;
4687
4688         rcu_read_lock();
4689         list_for_each_entry_rcu(table, &net->nft.tables, list) {
4690                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4691                     dump_ctx->ctx.family != table->family)
4692                         continue;
4693
4694                 if (table != dump_ctx->ctx.table)
4695                         continue;
4696
4697                 list_for_each_entry_rcu(set, &table->sets, list) {
4698                         if (set == dump_ctx->set) {
4699                                 set_found = true;
4700                                 break;
4701                         }
4702                 }
4703                 break;
4704         }
4705
4706         if (!set_found) {
4707                 rcu_read_unlock();
4708                 return -ENOENT;
4709         }
4710
4711         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4712         portid = NETLINK_CB(cb->skb).portid;
4713         seq    = cb->nlh->nlmsg_seq;
4714
4715         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4716                         NLM_F_MULTI);
4717         if (nlh == NULL)
4718                 goto nla_put_failure;
4719
4720         nfmsg = nlmsg_data(nlh);
4721         nfmsg->nfgen_family = table->family;
4722         nfmsg->version      = NFNETLINK_V0;
4723         nfmsg->res_id       = htons(net->nft.base_seq & 0xffff);
4724
4725         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4726                 goto nla_put_failure;
4727         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4728                 goto nla_put_failure;
4729
4730         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4731         if (nest == NULL)
4732                 goto nla_put_failure;
4733
4734         args.cb                 = cb;
4735         args.skb                = skb;
4736         args.iter.genmask       = nft_genmask_cur(net);
4737         args.iter.skip          = cb->args[0];
4738         args.iter.count         = 0;
4739         args.iter.err           = 0;
4740         args.iter.fn            = nf_tables_dump_setelem;
4741         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4742         rcu_read_unlock();
4743
4744         nla_nest_end(skb, nest);
4745         nlmsg_end(skb, nlh);
4746
4747         if (args.iter.err && args.iter.err != -EMSGSIZE)
4748                 return args.iter.err;
4749         if (args.iter.count == cb->args[0])
4750                 return 0;
4751
4752         cb->args[0] = args.iter.count;
4753         return skb->len;
4754
4755 nla_put_failure:
4756         rcu_read_unlock();
4757         return -ENOSPC;
4758 }
4759
4760 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4761 {
4762         struct nft_set_dump_ctx *dump_ctx = cb->data;
4763
4764         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4765
4766         return cb->data ? 0 : -ENOMEM;
4767 }
4768
4769 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4770 {
4771         kfree(cb->data);
4772         return 0;
4773 }
4774
4775 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4776                                        const struct nft_ctx *ctx, u32 seq,
4777                                        u32 portid, int event, u16 flags,
4778                                        const struct nft_set *set,
4779                                        const struct nft_set_elem *elem)
4780 {
4781         struct nfgenmsg *nfmsg;
4782         struct nlmsghdr *nlh;
4783         struct nlattr *nest;
4784         int err;
4785
4786         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4787         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4788                         flags);
4789         if (nlh == NULL)
4790                 goto nla_put_failure;
4791
4792         nfmsg = nlmsg_data(nlh);
4793         nfmsg->nfgen_family     = ctx->family;
4794         nfmsg->version          = NFNETLINK_V0;
4795         nfmsg->res_id           = htons(ctx->net->nft.base_seq & 0xffff);
4796
4797         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4798                 goto nla_put_failure;
4799         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4800                 goto nla_put_failure;
4801
4802         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4803         if (nest == NULL)
4804                 goto nla_put_failure;
4805
4806         err = nf_tables_fill_setelem(skb, set, elem);
4807         if (err < 0)
4808                 goto nla_put_failure;
4809
4810         nla_nest_end(skb, nest);
4811
4812         nlmsg_end(skb, nlh);
4813         return 0;
4814
4815 nla_put_failure:
4816         nlmsg_trim(skb, nlh);
4817         return -1;
4818 }
4819
4820 static int nft_setelem_parse_flags(const struct nft_set *set,
4821                                    const struct nlattr *attr, u32 *flags)
4822 {
4823         if (attr == NULL)
4824                 return 0;
4825
4826         *flags = ntohl(nla_get_be32(attr));
4827         if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4828                 return -EINVAL;
4829         if (!(set->flags & NFT_SET_INTERVAL) &&
4830             *flags & NFT_SET_ELEM_INTERVAL_END)
4831                 return -EINVAL;
4832
4833         return 0;
4834 }
4835
4836 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
4837                                  struct nft_data *key, struct nlattr *attr)
4838 {
4839         struct nft_data_desc desc;
4840         int err;
4841
4842         err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
4843         if (err < 0)
4844                 return err;
4845
4846         if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
4847                 nft_data_release(key, desc.type);
4848                 return -EINVAL;
4849         }
4850
4851         return 0;
4852 }
4853
4854 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
4855                                   struct nft_data_desc *desc,
4856                                   struct nft_data *data,
4857                                   struct nlattr *attr)
4858 {
4859         int err;
4860
4861         err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
4862         if (err < 0)
4863                 return err;
4864
4865         if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
4866                 nft_data_release(data, desc->type);
4867                 return -EINVAL;
4868         }
4869
4870         return 0;
4871 }
4872
4873 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4874                             const struct nlattr *attr)
4875 {
4876         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4877         struct nft_set_elem elem;
4878         struct sk_buff *skb;
4879         uint32_t flags = 0;
4880         void *priv;
4881         int err;
4882
4883         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4884                                           nft_set_elem_policy, NULL);
4885         if (err < 0)
4886                 return err;
4887
4888         if (!nla[NFTA_SET_ELEM_KEY])
4889                 return -EINVAL;
4890
4891         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4892         if (err < 0)
4893                 return err;
4894
4895         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
4896                                     nla[NFTA_SET_ELEM_KEY]);
4897         if (err < 0)
4898                 return err;
4899
4900         if (nla[NFTA_SET_ELEM_KEY_END]) {
4901                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
4902                                             nla[NFTA_SET_ELEM_KEY_END]);
4903                 if (err < 0)
4904                         return err;
4905         }
4906
4907         priv = set->ops->get(ctx->net, set, &elem, flags);
4908         if (IS_ERR(priv))
4909                 return PTR_ERR(priv);
4910
4911         elem.priv = priv;
4912
4913         err = -ENOMEM;
4914         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
4915         if (skb == NULL)
4916                 return err;
4917
4918         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4919                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
4920         if (err < 0)
4921                 goto err_fill_setelem;
4922
4923         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
4924
4925 err_fill_setelem:
4926         kfree_skb(skb);
4927         return err;
4928 }
4929
4930 /* called with rcu_read_lock held */
4931 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4932                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
4933                                 const struct nlattr * const nla[],
4934                                 struct netlink_ext_ack *extack)
4935 {
4936         u8 genmask = nft_genmask_cur(net);
4937         struct nft_set *set;
4938         struct nlattr *attr;
4939         struct nft_ctx ctx;
4940         int rem, err = 0;
4941
4942         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4943                                          genmask);
4944         if (err < 0)
4945                 return err;
4946
4947         set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4948         if (IS_ERR(set))
4949                 return PTR_ERR(set);
4950
4951         if (nlh->nlmsg_flags & NLM_F_DUMP) {
4952                 struct netlink_dump_control c = {
4953                         .start = nf_tables_dump_set_start,
4954                         .dump = nf_tables_dump_set,
4955                         .done = nf_tables_dump_set_done,
4956                         .module = THIS_MODULE,
4957                 };
4958                 struct nft_set_dump_ctx dump_ctx = {
4959                         .set = set,
4960                         .ctx = ctx,
4961                 };
4962
4963                 c.data = &dump_ctx;
4964                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4965         }
4966
4967         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4968                 return -EINVAL;
4969
4970         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4971                 err = nft_get_set_elem(&ctx, set, attr);
4972                 if (err < 0)
4973                         break;
4974         }
4975
4976         return err;
4977 }
4978
4979 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4980                                      const struct nft_set *set,
4981                                      const struct nft_set_elem *elem,
4982                                      int event, u16 flags)
4983 {
4984         struct net *net = ctx->net;
4985         u32 portid = ctx->portid;
4986         struct sk_buff *skb;
4987         int err;
4988         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
4989                               ctx->table->name, ctx->table->handle,
4990                               set->name, set->handle);
4991
4992         audit_log_nfcfg(buf,
4993                         ctx->family,
4994                         set->handle,
4995                         event == NFT_MSG_NEWSETELEM ?
4996                                 AUDIT_NFT_OP_SETELEM_REGISTER :
4997                                 AUDIT_NFT_OP_SETELEM_UNREGISTER,
4998                         GFP_KERNEL);
4999         kfree(buf);
5000
5001         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5002                 return;
5003
5004         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5005         if (skb == NULL)
5006                 goto err;
5007
5008         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5009                                           set, elem);
5010         if (err < 0) {
5011                 kfree_skb(skb);
5012                 goto err;
5013         }
5014
5015         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
5016         return;
5017 err:
5018         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5019 }
5020
5021 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5022                                               int msg_type,
5023                                               struct nft_set *set)
5024 {
5025         struct nft_trans *trans;
5026
5027         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5028         if (trans == NULL)
5029                 return NULL;
5030
5031         nft_trans_elem_set(trans) = set;
5032         return trans;
5033 }
5034
5035 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5036                                          const struct nft_set *set,
5037                                          const struct nlattr *attr)
5038 {
5039         struct nft_expr *expr;
5040         int err;
5041
5042         expr = nft_expr_init(ctx, attr);
5043         if (IS_ERR(expr))
5044                 return expr;
5045
5046         err = -EOPNOTSUPP;
5047         if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL))
5048                 goto err_set_elem_expr;
5049
5050         if (expr->ops->type->flags & NFT_EXPR_GC) {
5051                 if (set->flags & NFT_SET_TIMEOUT)
5052                         goto err_set_elem_expr;
5053                 if (!set->ops->gc_init)
5054                         goto err_set_elem_expr;
5055                 set->ops->gc_init(set);
5056         }
5057
5058         return expr;
5059
5060 err_set_elem_expr:
5061         nft_expr_destroy(ctx, expr);
5062         return ERR_PTR(err);
5063 }
5064
5065 void *nft_set_elem_init(const struct nft_set *set,
5066                         const struct nft_set_ext_tmpl *tmpl,
5067                         const u32 *key, const u32 *key_end,
5068                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5069 {
5070         struct nft_set_ext *ext;
5071         void *elem;
5072
5073         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5074         if (elem == NULL)
5075                 return NULL;
5076
5077         ext = nft_set_elem_ext(set, elem);
5078         nft_set_ext_init(ext, tmpl);
5079
5080         memcpy(nft_set_ext_key(ext), key, set->klen);
5081         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5082                 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5083         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5084                 memcpy(nft_set_ext_data(ext), data, set->dlen);
5085         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5086                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5087                 if (expiration == 0)
5088                         *nft_set_ext_expiration(ext) += timeout;
5089         }
5090         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5091                 *nft_set_ext_timeout(ext) = timeout;
5092
5093         return elem;
5094 }
5095
5096 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5097                                       struct nft_expr *expr)
5098 {
5099         if (expr->ops->destroy_clone) {
5100                 expr->ops->destroy_clone(ctx, expr);
5101                 module_put(expr->ops->type->owner);
5102         } else {
5103                 nf_tables_expr_destroy(ctx, expr);
5104         }
5105 }
5106
5107 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5108                           bool destroy_expr)
5109 {
5110         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5111         struct nft_ctx ctx = {
5112                 .net    = read_pnet(&set->net),
5113                 .family = set->table->family,
5114         };
5115
5116         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5117         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5118                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5119         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
5120                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5121
5122         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5123                 (*nft_set_ext_obj(ext))->use--;
5124         kfree(elem);
5125 }
5126 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5127
5128 /* Only called from commit path, nft_set_elem_deactivate() already deals with
5129  * the refcounting from the preparation phase.
5130  */
5131 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5132                                        const struct nft_set *set, void *elem)
5133 {
5134         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5135
5136         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
5137                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5138
5139         kfree(elem);
5140 }
5141
5142 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5143                             const struct nlattr *attr, u32 nlmsg_flags)
5144 {
5145         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5146         u8 genmask = nft_genmask_next(ctx->net);
5147         struct nft_set_ext_tmpl tmpl;
5148         struct nft_set_ext *ext, *ext2;
5149         struct nft_set_elem elem;
5150         struct nft_set_binding *binding;
5151         struct nft_object *obj = NULL;
5152         struct nft_expr *expr = NULL;
5153         struct nft_userdata *udata;
5154         struct nft_data_desc desc;
5155         enum nft_registers dreg;
5156         struct nft_trans *trans;
5157         u32 flags = 0;
5158         u64 timeout;
5159         u64 expiration;
5160         u8 ulen;
5161         int err;
5162
5163         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5164                                           nft_set_elem_policy, NULL);
5165         if (err < 0)
5166                 return err;
5167
5168         if (nla[NFTA_SET_ELEM_KEY] == NULL)
5169                 return -EINVAL;
5170
5171         nft_set_ext_prepare(&tmpl);
5172
5173         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5174         if (err < 0)
5175                 return err;
5176         if (flags != 0)
5177                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5178
5179         if (set->flags & NFT_SET_MAP) {
5180                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5181                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5182                         return -EINVAL;
5183         } else {
5184                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5185                         return -EINVAL;
5186         }
5187
5188         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5189              (nla[NFTA_SET_ELEM_DATA] ||
5190               nla[NFTA_SET_ELEM_OBJREF] ||
5191               nla[NFTA_SET_ELEM_TIMEOUT] ||
5192               nla[NFTA_SET_ELEM_EXPIRATION] ||
5193               nla[NFTA_SET_ELEM_USERDATA] ||
5194               nla[NFTA_SET_ELEM_EXPR]))
5195                 return -EINVAL;
5196
5197         timeout = 0;
5198         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5199                 if (!(set->flags & NFT_SET_TIMEOUT))
5200                         return -EINVAL;
5201                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5202                                             &timeout);
5203                 if (err)
5204                         return err;
5205         } else if (set->flags & NFT_SET_TIMEOUT) {
5206                 timeout = set->timeout;
5207         }
5208
5209         expiration = 0;
5210         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5211                 if (!(set->flags & NFT_SET_TIMEOUT))
5212                         return -EINVAL;
5213                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5214                                             &expiration);
5215                 if (err)
5216                         return err;
5217         }
5218
5219         if (nla[NFTA_SET_ELEM_EXPR] != NULL) {
5220                 expr = nft_set_elem_expr_alloc(ctx, set,
5221                                                nla[NFTA_SET_ELEM_EXPR]);
5222                 if (IS_ERR(expr))
5223                         return PTR_ERR(expr);
5224
5225                 err = -EOPNOTSUPP;
5226                 if (set->expr && set->expr->ops != expr->ops)
5227                         goto err_set_elem_expr;
5228         } else if (set->expr) {
5229                 expr = kzalloc(set->expr->ops->size, GFP_KERNEL);
5230                 if (!expr)
5231                         return -ENOMEM;
5232
5233                 err = nft_expr_clone(expr, set->expr);
5234                 if (err < 0)
5235                         goto err_set_elem_expr;
5236         }
5237
5238         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5239                                     nla[NFTA_SET_ELEM_KEY]);
5240         if (err < 0)
5241                 goto err_set_elem_expr;
5242
5243         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5244
5245         if (nla[NFTA_SET_ELEM_KEY_END]) {
5246                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5247                                             nla[NFTA_SET_ELEM_KEY_END]);
5248                 if (err < 0)
5249                         goto err_parse_key;
5250
5251                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5252         }
5253
5254         if (timeout > 0) {
5255                 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5256                 if (timeout != set->timeout)
5257                         nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5258         }
5259
5260         if (expr)
5261                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPR,
5262                                        expr->ops->size);
5263
5264         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5265                 if (!(set->flags & NFT_SET_OBJECT)) {
5266                         err = -EINVAL;
5267                         goto err_parse_key_end;
5268                 }
5269                 obj = nft_obj_lookup(ctx->net, ctx->table,
5270                                      nla[NFTA_SET_ELEM_OBJREF],
5271                                      set->objtype, genmask);
5272                 if (IS_ERR(obj)) {
5273                         err = PTR_ERR(obj);
5274                         goto err_parse_key_end;
5275                 }
5276                 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5277         }
5278
5279         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5280                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5281                                              nla[NFTA_SET_ELEM_DATA]);
5282                 if (err < 0)
5283                         goto err_parse_key_end;
5284
5285                 dreg = nft_type_to_reg(set->dtype);
5286                 list_for_each_entry(binding, &set->bindings, list) {
5287                         struct nft_ctx bind_ctx = {
5288                                 .net    = ctx->net,
5289                                 .family = ctx->family,
5290                                 .table  = ctx->table,
5291                                 .chain  = (struct nft_chain *)binding->chain,
5292                         };
5293
5294                         if (!(binding->flags & NFT_SET_MAP))
5295                                 continue;
5296
5297                         err = nft_validate_register_store(&bind_ctx, dreg,
5298                                                           &elem.data.val,
5299                                                           desc.type, desc.len);
5300                         if (err < 0)
5301                                 goto err_parse_data;
5302
5303                         if (desc.type == NFT_DATA_VERDICT &&
5304                             (elem.data.val.verdict.code == NFT_GOTO ||
5305                              elem.data.val.verdict.code == NFT_JUMP))
5306                                 nft_validate_state_update(ctx->net,
5307                                                           NFT_VALIDATE_NEED);
5308                 }
5309
5310                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
5311         }
5312
5313         /* The full maximum length of userdata can exceed the maximum
5314          * offset value (U8_MAX) for following extensions, therefor it
5315          * must be the last extension added.
5316          */
5317         ulen = 0;
5318         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5319                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5320                 if (ulen > 0)
5321                         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5322                                                ulen);
5323         }
5324
5325         err = -ENOMEM;
5326         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5327                                       elem.key_end.val.data, elem.data.val.data,
5328                                       timeout, expiration, GFP_KERNEL);
5329         if (elem.priv == NULL)
5330                 goto err_parse_data;
5331
5332         ext = nft_set_elem_ext(set, elem.priv);
5333         if (flags)
5334                 *nft_set_ext_flags(ext) = flags;
5335         if (ulen > 0) {
5336                 udata = nft_set_ext_userdata(ext);
5337                 udata->len = ulen - 1;
5338                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5339         }
5340         if (obj) {
5341                 *nft_set_ext_obj(ext) = obj;
5342                 obj->use++;
5343         }
5344         if (expr) {
5345                 memcpy(nft_set_ext_expr(ext), expr, expr->ops->size);
5346                 kfree(expr);
5347                 expr = NULL;
5348         }
5349
5350         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5351         if (trans == NULL)
5352                 goto err_trans;
5353
5354         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
5355         err = set->ops->insert(ctx->net, set, &elem, &ext2);
5356         if (err) {
5357                 if (err == -EEXIST) {
5358                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5359                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5360                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
5361                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
5362                                 goto err_element_clash;
5363                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5364                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5365                              memcmp(nft_set_ext_data(ext),
5366                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
5367                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5368                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5369                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
5370                                 goto err_element_clash;
5371                         else if (!(nlmsg_flags & NLM_F_EXCL))
5372                                 err = 0;
5373                 } else if (err == -ENOTEMPTY) {
5374                         /* ENOTEMPTY reports overlapping between this element
5375                          * and an existing one.
5376                          */
5377                         err = -EEXIST;
5378                 }
5379                 goto err_element_clash;
5380         }
5381
5382         if (set->size &&
5383             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5384                 err = -ENFILE;
5385                 goto err_set_full;
5386         }
5387
5388         nft_trans_elem(trans) = elem;
5389         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5390         return 0;
5391
5392 err_set_full:
5393         set->ops->remove(ctx->net, set, &elem);
5394 err_element_clash:
5395         kfree(trans);
5396 err_trans:
5397         if (obj)
5398                 obj->use--;
5399
5400         nf_tables_set_elem_destroy(ctx, set, elem.priv);
5401 err_parse_data:
5402         if (nla[NFTA_SET_ELEM_DATA] != NULL)
5403                 nft_data_release(&elem.data.val, desc.type);
5404 err_parse_key_end:
5405         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
5406 err_parse_key:
5407         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5408 err_set_elem_expr:
5409         if (expr != NULL)
5410                 nft_expr_destroy(ctx, expr);
5411
5412         return err;
5413 }
5414
5415 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
5416                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5417                                 const struct nlattr * const nla[],
5418                                 struct netlink_ext_ack *extack)
5419 {
5420         u8 genmask = nft_genmask_next(net);
5421         const struct nlattr *attr;
5422         struct nft_set *set;
5423         struct nft_ctx ctx;
5424         int rem, err;
5425
5426         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
5427                 return -EINVAL;
5428
5429         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5430                                          genmask);
5431         if (err < 0)
5432                 return err;
5433
5434         set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
5435                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
5436         if (IS_ERR(set))
5437                 return PTR_ERR(set);
5438
5439         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5440                 return -EBUSY;
5441
5442         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5443                 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
5444                 if (err < 0)
5445                         return err;
5446         }
5447
5448         if (net->nft.validate_state == NFT_VALIDATE_DO)
5449                 return nft_table_validate(net, ctx.table);
5450
5451         return 0;
5452 }
5453
5454 /**
5455  *      nft_data_hold - hold a nft_data item
5456  *
5457  *      @data: struct nft_data to release
5458  *      @type: type of data
5459  *
5460  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5461  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
5462  *      NFT_GOTO verdicts. This function must be called on active data objects
5463  *      from the second phase of the commit protocol.
5464  */
5465 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
5466 {
5467         struct nft_chain *chain;
5468         struct nft_rule *rule;
5469
5470         if (type == NFT_DATA_VERDICT) {
5471                 switch (data->verdict.code) {
5472                 case NFT_JUMP:
5473                 case NFT_GOTO:
5474                         chain = data->verdict.chain;
5475                         chain->use++;
5476
5477                         if (!nft_chain_is_bound(chain))
5478                                 break;
5479
5480                         chain->table->use++;
5481                         list_for_each_entry(rule, &chain->rules, list)
5482                                 chain->use++;
5483
5484                         nft_chain_add(chain->table, chain);
5485                         break;
5486                 }
5487         }
5488 }
5489
5490 static void nft_set_elem_activate(const struct net *net,
5491                                   const struct nft_set *set,
5492                                   struct nft_set_elem *elem)
5493 {
5494         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5495
5496         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5497                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
5498         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5499                 (*nft_set_ext_obj(ext))->use++;
5500 }
5501
5502 static void nft_set_elem_deactivate(const struct net *net,
5503                                     const struct nft_set *set,
5504                                     struct nft_set_elem *elem)
5505 {
5506         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5507
5508         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5509                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5510         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5511                 (*nft_set_ext_obj(ext))->use--;
5512 }
5513
5514 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
5515                            const struct nlattr *attr)
5516 {
5517         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5518         struct nft_set_ext_tmpl tmpl;
5519         struct nft_set_elem elem;
5520         struct nft_set_ext *ext;
5521         struct nft_trans *trans;
5522         u32 flags = 0;
5523         void *priv;
5524         int err;
5525
5526         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5527                                           nft_set_elem_policy, NULL);
5528         if (err < 0)
5529                 return err;
5530
5531         if (nla[NFTA_SET_ELEM_KEY] == NULL)
5532                 return -EINVAL;
5533
5534         nft_set_ext_prepare(&tmpl);
5535
5536         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5537         if (err < 0)
5538                 return err;
5539         if (flags != 0)
5540                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5541
5542         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5543                                     nla[NFTA_SET_ELEM_KEY]);
5544         if (err < 0)
5545                 return err;
5546
5547         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5548
5549         if (nla[NFTA_SET_ELEM_KEY_END]) {
5550                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5551                                             nla[NFTA_SET_ELEM_KEY_END]);
5552                 if (err < 0)
5553                         return err;
5554
5555                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5556         }
5557
5558         err = -ENOMEM;
5559         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5560                                       elem.key_end.val.data, NULL, 0, 0,
5561                                       GFP_KERNEL);
5562         if (elem.priv == NULL)
5563                 goto fail_elem;
5564
5565         ext = nft_set_elem_ext(set, elem.priv);
5566         if (flags)
5567                 *nft_set_ext_flags(ext) = flags;
5568
5569         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
5570         if (trans == NULL)
5571                 goto fail_trans;
5572
5573         priv = set->ops->deactivate(ctx->net, set, &elem);
5574         if (priv == NULL) {
5575                 err = -ENOENT;
5576                 goto fail_ops;
5577         }
5578         kfree(elem.priv);
5579         elem.priv = priv;
5580
5581         nft_set_elem_deactivate(ctx->net, set, &elem);
5582
5583         nft_trans_elem(trans) = elem;
5584         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5585         return 0;
5586
5587 fail_ops:
5588         kfree(trans);
5589 fail_trans:
5590         kfree(elem.priv);
5591 fail_elem:
5592         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5593         return err;
5594 }
5595
5596 static int nft_flush_set(const struct nft_ctx *ctx,
5597                          struct nft_set *set,
5598                          const struct nft_set_iter *iter,
5599                          struct nft_set_elem *elem)
5600 {
5601         struct nft_trans *trans;
5602         int err;
5603
5604         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
5605                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
5606         if (!trans)
5607                 return -ENOMEM;
5608
5609         if (!set->ops->flush(ctx->net, set, elem->priv)) {
5610                 err = -ENOENT;
5611                 goto err1;
5612         }
5613         set->ndeact++;
5614
5615         nft_set_elem_deactivate(ctx->net, set, elem);
5616         nft_trans_elem_set(trans) = set;
5617         nft_trans_elem(trans) = *elem;
5618         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5619
5620         return 0;
5621 err1:
5622         kfree(trans);
5623         return err;
5624 }
5625
5626 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
5627                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5628                                 const struct nlattr * const nla[],
5629                                 struct netlink_ext_ack *extack)
5630 {
5631         u8 genmask = nft_genmask_next(net);
5632         const struct nlattr *attr;
5633         struct nft_set *set;
5634         struct nft_ctx ctx;
5635         int rem, err = 0;
5636
5637         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5638                                          genmask);
5639         if (err < 0)
5640                 return err;
5641
5642         set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5643         if (IS_ERR(set))
5644                 return PTR_ERR(set);
5645         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5646                 return -EBUSY;
5647
5648         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
5649                 struct nft_set_iter iter = {
5650                         .genmask        = genmask,
5651                         .fn             = nft_flush_set,
5652                 };
5653                 set->ops->walk(&ctx, set, &iter);
5654
5655                 return iter.err;
5656         }
5657
5658         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5659                 err = nft_del_setelem(&ctx, set, attr);
5660                 if (err < 0)
5661                         break;
5662
5663                 set->ndeact++;
5664         }
5665         return err;
5666 }
5667
5668 void nft_set_gc_batch_release(struct rcu_head *rcu)
5669 {
5670         struct nft_set_gc_batch *gcb;
5671         unsigned int i;
5672
5673         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
5674         for (i = 0; i < gcb->head.cnt; i++)
5675                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
5676         kfree(gcb);
5677 }
5678
5679 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
5680                                                 gfp_t gfp)
5681 {
5682         struct nft_set_gc_batch *gcb;
5683
5684         gcb = kzalloc(sizeof(*gcb), gfp);
5685         if (gcb == NULL)
5686                 return gcb;
5687         gcb->head.set = set;
5688         return gcb;
5689 }
5690
5691 /*
5692  * Stateful objects
5693  */
5694
5695 /**
5696  *      nft_register_obj- register nf_tables stateful object type
5697  *      @obj_type: object type
5698  *
5699  *      Registers the object type for use with nf_tables. Returns zero on
5700  *      success or a negative errno code otherwise.
5701  */
5702 int nft_register_obj(struct nft_object_type *obj_type)
5703 {
5704         if (obj_type->type == NFT_OBJECT_UNSPEC)
5705                 return -EINVAL;
5706
5707         nfnl_lock(NFNL_SUBSYS_NFTABLES);
5708         list_add_rcu(&obj_type->list, &nf_tables_objects);
5709         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5710         return 0;
5711 }
5712 EXPORT_SYMBOL_GPL(nft_register_obj);
5713
5714 /**
5715  *      nft_unregister_obj - unregister nf_tables object type
5716  *      @obj_type: object type
5717  *
5718  *      Unregisters the object type for use with nf_tables.
5719  */
5720 void nft_unregister_obj(struct nft_object_type *obj_type)
5721 {
5722         nfnl_lock(NFNL_SUBSYS_NFTABLES);
5723         list_del_rcu(&obj_type->list);
5724         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5725 }
5726 EXPORT_SYMBOL_GPL(nft_unregister_obj);
5727
5728 struct nft_object *nft_obj_lookup(const struct net *net,
5729                                   const struct nft_table *table,
5730                                   const struct nlattr *nla, u32 objtype,
5731                                   u8 genmask)
5732 {
5733         struct nft_object_hash_key k = { .table = table };
5734         char search[NFT_OBJ_MAXNAMELEN];
5735         struct rhlist_head *tmp, *list;
5736         struct nft_object *obj;
5737
5738         nla_strlcpy(search, nla, sizeof(search));
5739         k.name = search;
5740
5741         WARN_ON_ONCE(!rcu_read_lock_held() &&
5742                      !lockdep_commit_lock_is_held(net));
5743
5744         rcu_read_lock();
5745         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
5746         if (!list)
5747                 goto out;
5748
5749         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
5750                 if (objtype == obj->ops->type->type &&
5751                     nft_active_genmask(obj, genmask)) {
5752                         rcu_read_unlock();
5753                         return obj;
5754                 }
5755         }
5756 out:
5757         rcu_read_unlock();
5758         return ERR_PTR(-ENOENT);
5759 }
5760 EXPORT_SYMBOL_GPL(nft_obj_lookup);
5761
5762 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
5763                                                   const struct nlattr *nla,
5764                                                   u32 objtype, u8 genmask)
5765 {
5766         struct nft_object *obj;
5767
5768         list_for_each_entry(obj, &table->objects, list) {
5769                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
5770                     objtype == obj->ops->type->type &&
5771                     nft_active_genmask(obj, genmask))
5772                         return obj;
5773         }
5774         return ERR_PTR(-ENOENT);
5775 }
5776
5777 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
5778         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
5779                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
5780         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
5781                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
5782         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
5783         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
5784         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
5785         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
5786                                     .len = NFT_USERDATA_MAXLEN },
5787 };
5788
5789 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
5790                                        const struct nft_object_type *type,
5791                                        const struct nlattr *attr)
5792 {
5793         struct nlattr **tb;
5794         const struct nft_object_ops *ops;
5795         struct nft_object *obj;
5796         int err = -ENOMEM;
5797
5798         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
5799         if (!tb)
5800                 goto err1;
5801
5802         if (attr) {
5803                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
5804                                                   type->policy, NULL);
5805                 if (err < 0)
5806                         goto err2;
5807         } else {
5808                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
5809         }
5810
5811         if (type->select_ops) {
5812                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
5813                 if (IS_ERR(ops)) {
5814                         err = PTR_ERR(ops);
5815                         goto err2;
5816                 }
5817         } else {
5818                 ops = type->ops;
5819         }
5820
5821         err = -ENOMEM;
5822         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
5823         if (!obj)
5824                 goto err2;
5825
5826         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
5827         if (err < 0)
5828                 goto err3;
5829
5830         obj->ops = ops;
5831
5832         kfree(tb);
5833         return obj;
5834 err3:
5835         kfree(obj);
5836 err2:
5837         kfree(tb);
5838 err1:
5839         return ERR_PTR(err);
5840 }
5841
5842 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
5843                            struct nft_object *obj, bool reset)
5844 {
5845         struct nlattr *nest;
5846
5847         nest = nla_nest_start_noflag(skb, attr);
5848         if (!nest)
5849                 goto nla_put_failure;
5850         if (obj->ops->dump(skb, obj, reset) < 0)
5851                 goto nla_put_failure;
5852         nla_nest_end(skb, nest);
5853         return 0;
5854
5855 nla_put_failure:
5856         return -1;
5857 }
5858
5859 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
5860 {
5861         const struct nft_object_type *type;
5862
5863         list_for_each_entry(type, &nf_tables_objects, list) {
5864                 if (objtype == type->type)
5865                         return type;
5866         }
5867         return NULL;
5868 }
5869
5870 static const struct nft_object_type *
5871 nft_obj_type_get(struct net *net, u32 objtype)
5872 {
5873         const struct nft_object_type *type;
5874
5875         type = __nft_obj_type_get(objtype);
5876         if (type != NULL && try_module_get(type->owner))
5877                 return type;
5878
5879         lockdep_nfnl_nft_mutex_not_held();
5880 #ifdef CONFIG_MODULES
5881         if (type == NULL) {
5882                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
5883                         return ERR_PTR(-EAGAIN);
5884         }
5885 #endif
5886         return ERR_PTR(-ENOENT);
5887 }
5888
5889 static int nf_tables_updobj(const struct nft_ctx *ctx,
5890                             const struct nft_object_type *type,
5891                             const struct nlattr *attr,
5892                             struct nft_object *obj)
5893 {
5894         struct nft_object *newobj;
5895         struct nft_trans *trans;
5896         int err;
5897
5898         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
5899                                 sizeof(struct nft_trans_obj));
5900         if (!trans)
5901                 return -ENOMEM;
5902
5903         newobj = nft_obj_init(ctx, type, attr);
5904         if (IS_ERR(newobj)) {
5905                 err = PTR_ERR(newobj);
5906                 goto err_free_trans;
5907         }
5908
5909         nft_trans_obj(trans) = obj;
5910         nft_trans_obj_update(trans) = true;
5911         nft_trans_obj_newobj(trans) = newobj;
5912         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5913
5914         return 0;
5915
5916 err_free_trans:
5917         kfree(trans);
5918         return err;
5919 }
5920
5921 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
5922                             struct sk_buff *skb, const struct nlmsghdr *nlh,
5923                             const struct nlattr * const nla[],
5924                             struct netlink_ext_ack *extack)
5925 {
5926         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5927         const struct nft_object_type *type;
5928         u8 genmask = nft_genmask_next(net);
5929         int family = nfmsg->nfgen_family;
5930         struct nft_table *table;
5931         struct nft_object *obj;
5932         struct nft_ctx ctx;
5933         u32 objtype;
5934         int err;
5935
5936         if (!nla[NFTA_OBJ_TYPE] ||
5937             !nla[NFTA_OBJ_NAME] ||
5938             !nla[NFTA_OBJ_DATA])
5939                 return -EINVAL;
5940
5941         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5942         if (IS_ERR(table)) {
5943                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5944                 return PTR_ERR(table);
5945         }
5946
5947         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5948         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
5949         if (IS_ERR(obj)) {
5950                 err = PTR_ERR(obj);
5951                 if (err != -ENOENT) {
5952                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5953                         return err;
5954                 }
5955         } else {
5956                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5957                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5958                         return -EEXIST;
5959                 }
5960                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
5961                         return -EOPNOTSUPP;
5962
5963                 type = __nft_obj_type_get(objtype);
5964                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5965
5966                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
5967         }
5968
5969         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5970
5971         type = nft_obj_type_get(net, objtype);
5972         if (IS_ERR(type))
5973                 return PTR_ERR(type);
5974
5975         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
5976         if (IS_ERR(obj)) {
5977                 err = PTR_ERR(obj);
5978                 goto err_init;
5979         }
5980         obj->key.table = table;
5981         obj->handle = nf_tables_alloc_handle(table);
5982
5983         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
5984         if (!obj->key.name) {
5985                 err = -ENOMEM;
5986                 goto err_strdup;
5987         }
5988
5989         if (nla[NFTA_OBJ_USERDATA]) {
5990                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
5991                 if (obj->udata == NULL)
5992                         goto err_userdata;
5993
5994                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
5995         }
5996
5997         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
5998         if (err < 0)
5999                 goto err_trans;
6000
6001         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6002                               nft_objname_ht_params);
6003         if (err < 0)
6004                 goto err_obj_ht;
6005
6006         list_add_tail_rcu(&obj->list, &table->objects);
6007         table->use++;
6008         return 0;
6009 err_obj_ht:
6010         /* queued in transaction log */
6011         INIT_LIST_HEAD(&obj->list);
6012         return err;
6013 err_trans:
6014         kfree(obj->key.name);
6015 err_userdata:
6016         kfree(obj->udata);
6017 err_strdup:
6018         if (obj->ops->destroy)
6019                 obj->ops->destroy(&ctx, obj);
6020         kfree(obj);
6021 err_init:
6022         module_put(type->owner);
6023         return err;
6024 }
6025
6026 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6027                                    u32 portid, u32 seq, int event, u32 flags,
6028                                    int family, const struct nft_table *table,
6029                                    struct nft_object *obj, bool reset)
6030 {
6031         struct nfgenmsg *nfmsg;
6032         struct nlmsghdr *nlh;
6033
6034         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6035         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
6036         if (nlh == NULL)
6037                 goto nla_put_failure;
6038
6039         nfmsg = nlmsg_data(nlh);
6040         nfmsg->nfgen_family     = family;
6041         nfmsg->version          = NFNETLINK_V0;
6042         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
6043
6044         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6045             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6046             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6047             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6048             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6049             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6050                          NFTA_OBJ_PAD))
6051                 goto nla_put_failure;
6052
6053         if (obj->udata &&
6054             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6055                 goto nla_put_failure;
6056
6057         nlmsg_end(skb, nlh);
6058         return 0;
6059
6060 nla_put_failure:
6061         nlmsg_trim(skb, nlh);
6062         return -1;
6063 }
6064
6065 struct nft_obj_filter {
6066         char            *table;
6067         u32             type;
6068 };
6069
6070 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6071 {
6072         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6073         const struct nft_table *table;
6074         unsigned int idx = 0, s_idx = cb->args[0];
6075         struct nft_obj_filter *filter = cb->data;
6076         struct net *net = sock_net(skb->sk);
6077         int family = nfmsg->nfgen_family;
6078         struct nft_object *obj;
6079         bool reset = false;
6080
6081         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6082                 reset = true;
6083
6084         rcu_read_lock();
6085         cb->seq = net->nft.base_seq;
6086
6087         list_for_each_entry_rcu(table, &net->nft.tables, list) {
6088                 if (family != NFPROTO_UNSPEC && family != table->family)
6089                         continue;
6090
6091                 list_for_each_entry_rcu(obj, &table->objects, list) {
6092                         if (!nft_is_active(net, obj))
6093                                 goto cont;
6094                         if (idx < s_idx)
6095                                 goto cont;
6096                         if (idx > s_idx)
6097                                 memset(&cb->args[1], 0,
6098                                        sizeof(cb->args) - sizeof(cb->args[0]));
6099                         if (filter && filter->table &&
6100                             strcmp(filter->table, table->name))
6101                                 goto cont;
6102                         if (filter &&
6103                             filter->type != NFT_OBJECT_UNSPEC &&
6104                             obj->ops->type->type != filter->type)
6105                                 goto cont;
6106
6107                         if (reset) {
6108                                 char *buf = kasprintf(GFP_ATOMIC,
6109                                                       "%s:%llu;?:0",
6110                                                       table->name,
6111                                                       table->handle);
6112
6113                                 audit_log_nfcfg(buf,
6114                                                 family,
6115                                                 obj->handle,
6116                                                 AUDIT_NFT_OP_OBJ_RESET,
6117                                                 GFP_ATOMIC);
6118                                 kfree(buf);
6119                         }
6120
6121                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6122                                                     cb->nlh->nlmsg_seq,
6123                                                     NFT_MSG_NEWOBJ,
6124                                                     NLM_F_MULTI | NLM_F_APPEND,
6125                                                     table->family, table,
6126                                                     obj, reset) < 0)
6127                                 goto done;
6128
6129                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6130 cont:
6131                         idx++;
6132                 }
6133         }
6134 done:
6135         rcu_read_unlock();
6136
6137         cb->args[0] = idx;
6138         return skb->len;
6139 }
6140
6141 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6142 {
6143         const struct nlattr * const *nla = cb->data;
6144         struct nft_obj_filter *filter = NULL;
6145
6146         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6147                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6148                 if (!filter)
6149                         return -ENOMEM;
6150
6151                 if (nla[NFTA_OBJ_TABLE]) {
6152                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6153                         if (!filter->table) {
6154                                 kfree(filter);
6155                                 return -ENOMEM;
6156                         }
6157                 }
6158
6159                 if (nla[NFTA_OBJ_TYPE])
6160                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6161         }
6162
6163         cb->data = filter;
6164         return 0;
6165 }
6166
6167 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6168 {
6169         struct nft_obj_filter *filter = cb->data;
6170
6171         if (filter) {
6172                 kfree(filter->table);
6173                 kfree(filter);
6174         }
6175
6176         return 0;
6177 }
6178
6179 /* called with rcu_read_lock held */
6180 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
6181                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6182                             const struct nlattr * const nla[],
6183                             struct netlink_ext_ack *extack)
6184 {
6185         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6186         u8 genmask = nft_genmask_cur(net);
6187         int family = nfmsg->nfgen_family;
6188         const struct nft_table *table;
6189         struct nft_object *obj;
6190         struct sk_buff *skb2;
6191         bool reset = false;
6192         u32 objtype;
6193         int err;
6194
6195         if (nlh->nlmsg_flags & NLM_F_DUMP) {
6196                 struct netlink_dump_control c = {
6197                         .start = nf_tables_dump_obj_start,
6198                         .dump = nf_tables_dump_obj,
6199                         .done = nf_tables_dump_obj_done,
6200                         .module = THIS_MODULE,
6201                         .data = (void *)nla,
6202                 };
6203
6204                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
6205         }
6206
6207         if (!nla[NFTA_OBJ_NAME] ||
6208             !nla[NFTA_OBJ_TYPE])
6209                 return -EINVAL;
6210
6211         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
6212         if (IS_ERR(table)) {
6213                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6214                 return PTR_ERR(table);
6215         }
6216
6217         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6218         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6219         if (IS_ERR(obj)) {
6220                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6221                 return PTR_ERR(obj);
6222         }
6223
6224         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6225         if (!skb2)
6226                 return -ENOMEM;
6227
6228         if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6229                 reset = true;
6230
6231         if (reset) {
6232                 char *buf = kasprintf(GFP_ATOMIC, "%s:%llu;?:0",
6233                                       table->name, table->handle);
6234
6235                 audit_log_nfcfg(buf,
6236                                 family,
6237                                 obj->handle,
6238                                 AUDIT_NFT_OP_OBJ_RESET,
6239                                 GFP_ATOMIC);
6240                 kfree(buf);
6241         }
6242
6243         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6244                                       nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
6245                                       family, table, obj, reset);
6246         if (err < 0)
6247                 goto err_fill_obj_info;
6248
6249         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6250
6251 err_fill_obj_info:
6252         kfree_skb(skb2);
6253         return err;
6254 }
6255
6256 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
6257 {
6258         if (obj->ops->destroy)
6259                 obj->ops->destroy(ctx, obj);
6260
6261         module_put(obj->ops->type->owner);
6262         kfree(obj->key.name);
6263         kfree(obj->udata);
6264         kfree(obj);
6265 }
6266
6267 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
6268                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6269                             const struct nlattr * const nla[],
6270                             struct netlink_ext_ack *extack)
6271 {
6272         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6273         u8 genmask = nft_genmask_next(net);
6274         int family = nfmsg->nfgen_family;
6275         const struct nlattr *attr;
6276         struct nft_table *table;
6277         struct nft_object *obj;
6278         struct nft_ctx ctx;
6279         u32 objtype;
6280
6281         if (!nla[NFTA_OBJ_TYPE] ||
6282             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
6283                 return -EINVAL;
6284
6285         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
6286         if (IS_ERR(table)) {
6287                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6288                 return PTR_ERR(table);
6289         }
6290
6291         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6292         if (nla[NFTA_OBJ_HANDLE]) {
6293                 attr = nla[NFTA_OBJ_HANDLE];
6294                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
6295         } else {
6296                 attr = nla[NFTA_OBJ_NAME];
6297                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
6298         }
6299
6300         if (IS_ERR(obj)) {
6301                 NL_SET_BAD_ATTR(extack, attr);
6302                 return PTR_ERR(obj);
6303         }
6304         if (obj->use > 0) {
6305                 NL_SET_BAD_ATTR(extack, attr);
6306                 return -EBUSY;
6307         }
6308
6309         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6310
6311         return nft_delobj(&ctx, obj);
6312 }
6313
6314 void nft_obj_notify(struct net *net, const struct nft_table *table,
6315                     struct nft_object *obj, u32 portid, u32 seq, int event,
6316                     int family, int report, gfp_t gfp)
6317 {
6318         struct sk_buff *skb;
6319         int err;
6320         char *buf = kasprintf(gfp, "%s:%llu;?:0",
6321                               table->name, table->handle);
6322
6323         audit_log_nfcfg(buf,
6324                         family,
6325                         obj->handle,
6326                         event == NFT_MSG_NEWOBJ ?
6327                                 AUDIT_NFT_OP_OBJ_REGISTER :
6328                                 AUDIT_NFT_OP_OBJ_UNREGISTER,
6329                         gfp);
6330         kfree(buf);
6331
6332         if (!report &&
6333             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6334                 return;
6335
6336         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
6337         if (skb == NULL)
6338                 goto err;
6339
6340         err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
6341                                       table, obj, false);
6342         if (err < 0) {
6343                 kfree_skb(skb);
6344                 goto err;
6345         }
6346
6347         nft_notify_enqueue(skb, report, &net->nft.notify_list);
6348         return;
6349 err:
6350         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6351 }
6352 EXPORT_SYMBOL_GPL(nft_obj_notify);
6353
6354 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
6355                                  struct nft_object *obj, int event)
6356 {
6357         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
6358                        ctx->family, ctx->report, GFP_KERNEL);
6359 }
6360
6361 /*
6362  * Flow tables
6363  */
6364 void nft_register_flowtable_type(struct nf_flowtable_type *type)
6365 {
6366         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6367         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
6368         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6369 }
6370 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
6371
6372 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
6373 {
6374         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6375         list_del_rcu(&type->list);
6376         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6377 }
6378 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
6379
6380 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
6381         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
6382                                             .len = NFT_NAME_MAXLEN - 1 },
6383         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
6384                                             .len = NFT_NAME_MAXLEN - 1 },
6385         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
6386         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
6387         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
6388 };
6389
6390 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
6391                                            const struct nlattr *nla, u8 genmask)
6392 {
6393         struct nft_flowtable *flowtable;
6394
6395         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6396                 if (!nla_strcmp(nla, flowtable->name) &&
6397                     nft_active_genmask(flowtable, genmask))
6398                         return flowtable;
6399         }
6400         return ERR_PTR(-ENOENT);
6401 }
6402 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
6403
6404 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
6405                                     struct nft_flowtable *flowtable,
6406                                     enum nft_trans_phase phase)
6407 {
6408         switch (phase) {
6409         case NFT_TRANS_PREPARE:
6410         case NFT_TRANS_ABORT:
6411         case NFT_TRANS_RELEASE:
6412                 flowtable->use--;
6413                 fallthrough;
6414         default:
6415                 return;
6416         }
6417 }
6418 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
6419
6420 static struct nft_flowtable *
6421 nft_flowtable_lookup_byhandle(const struct nft_table *table,
6422                               const struct nlattr *nla, u8 genmask)
6423 {
6424        struct nft_flowtable *flowtable;
6425
6426        list_for_each_entry(flowtable, &table->flowtables, list) {
6427                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
6428                    nft_active_genmask(flowtable, genmask))
6429                        return flowtable;
6430        }
6431        return ERR_PTR(-ENOENT);
6432 }
6433
6434 struct nft_flowtable_hook {
6435         u32                     num;
6436         int                     priority;
6437         struct list_head        list;
6438 };
6439
6440 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
6441         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
6442         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
6443         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
6444 };
6445
6446 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
6447                                     const struct nlattr *attr,
6448                                     struct nft_flowtable_hook *flowtable_hook,
6449                                     struct nft_flowtable *flowtable, bool add)
6450 {
6451         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
6452         struct nft_hook *hook;
6453         int hooknum, priority;
6454         int err;
6455
6456         INIT_LIST_HEAD(&flowtable_hook->list);
6457
6458         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
6459                                           nft_flowtable_hook_policy, NULL);
6460         if (err < 0)
6461                 return err;
6462
6463         if (add) {
6464                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
6465                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
6466                         return -EINVAL;
6467
6468                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6469                 if (hooknum != NF_NETDEV_INGRESS)
6470                         return -EOPNOTSUPP;
6471
6472                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6473
6474                 flowtable_hook->priority        = priority;
6475                 flowtable_hook->num             = hooknum;
6476         } else {
6477                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
6478                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6479                         if (hooknum != flowtable->hooknum)
6480                                 return -EOPNOTSUPP;
6481                 }
6482
6483                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
6484                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6485                         if (priority != flowtable->data.priority)
6486                                 return -EOPNOTSUPP;
6487                 }
6488
6489                 flowtable_hook->priority        = flowtable->data.priority;
6490                 flowtable_hook->num             = flowtable->hooknum;
6491         }
6492
6493         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
6494                 err = nf_tables_parse_netdev_hooks(ctx->net,
6495                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
6496                                                    &flowtable_hook->list);
6497                 if (err < 0)
6498                         return err;
6499         }
6500
6501         list_for_each_entry(hook, &flowtable_hook->list, list) {
6502                 hook->ops.pf            = NFPROTO_NETDEV;
6503                 hook->ops.hooknum       = flowtable_hook->num;
6504                 hook->ops.priority      = flowtable_hook->priority;
6505                 hook->ops.priv          = &flowtable->data;
6506                 hook->ops.hook          = flowtable->data.type->hook;
6507         }
6508
6509         return err;
6510 }
6511
6512 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
6513 {
6514         const struct nf_flowtable_type *type;
6515
6516         list_for_each_entry(type, &nf_tables_flowtables, list) {
6517                 if (family == type->family)
6518                         return type;
6519         }
6520         return NULL;
6521 }
6522
6523 static const struct nf_flowtable_type *
6524 nft_flowtable_type_get(struct net *net, u8 family)
6525 {
6526         const struct nf_flowtable_type *type;
6527
6528         type = __nft_flowtable_type_get(family);
6529         if (type != NULL && try_module_get(type->owner))
6530                 return type;
6531
6532         lockdep_nfnl_nft_mutex_not_held();
6533 #ifdef CONFIG_MODULES
6534         if (type == NULL) {
6535                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
6536                         return ERR_PTR(-EAGAIN);
6537         }
6538 #endif
6539         return ERR_PTR(-ENOENT);
6540 }
6541
6542 /* Only called from error and netdev event paths. */
6543 static void nft_unregister_flowtable_hook(struct net *net,
6544                                           struct nft_flowtable *flowtable,
6545                                           struct nft_hook *hook)
6546 {
6547         nf_unregister_net_hook(net, &hook->ops);
6548         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
6549                                     FLOW_BLOCK_UNBIND);
6550 }
6551
6552 static void nft_unregister_flowtable_net_hooks(struct net *net,
6553                                                struct list_head *hook_list)
6554 {
6555         struct nft_hook *hook;
6556
6557         list_for_each_entry(hook, hook_list, list)
6558                 nf_unregister_net_hook(net, &hook->ops);
6559 }
6560
6561 static int nft_register_flowtable_net_hooks(struct net *net,
6562                                             struct nft_table *table,
6563                                             struct list_head *hook_list,
6564                                             struct nft_flowtable *flowtable)
6565 {
6566         struct nft_hook *hook, *hook2, *next;
6567         struct nft_flowtable *ft;
6568         int err, i = 0;
6569
6570         list_for_each_entry(hook, hook_list, list) {
6571                 list_for_each_entry(ft, &table->flowtables, list) {
6572                         list_for_each_entry(hook2, &ft->hook_list, list) {
6573                                 if (hook->ops.dev == hook2->ops.dev &&
6574                                     hook->ops.pf == hook2->ops.pf) {
6575                                         err = -EEXIST;
6576                                         goto err_unregister_net_hooks;
6577                                 }
6578                         }
6579                 }
6580
6581                 err = flowtable->data.type->setup(&flowtable->data,
6582                                                   hook->ops.dev,
6583                                                   FLOW_BLOCK_BIND);
6584                 if (err < 0)
6585                         goto err_unregister_net_hooks;
6586
6587                 err = nf_register_net_hook(net, &hook->ops);
6588                 if (err < 0) {
6589                         flowtable->data.type->setup(&flowtable->data,
6590                                                     hook->ops.dev,
6591                                                     FLOW_BLOCK_UNBIND);
6592                         goto err_unregister_net_hooks;
6593                 }
6594
6595                 i++;
6596         }
6597
6598         return 0;
6599
6600 err_unregister_net_hooks:
6601         list_for_each_entry_safe(hook, next, hook_list, list) {
6602                 if (i-- <= 0)
6603                         break;
6604
6605                 nft_unregister_flowtable_hook(net, flowtable, hook);
6606                 list_del_rcu(&hook->list);
6607                 kfree_rcu(hook, rcu);
6608         }
6609
6610         return err;
6611 }
6612
6613 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
6614 {
6615         struct nft_hook *hook, *next;
6616
6617         list_for_each_entry_safe(hook, next, hook_list, list) {
6618                 list_del_rcu(&hook->list);
6619                 kfree_rcu(hook, rcu);
6620         }
6621 }
6622
6623 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
6624                                 struct nft_flowtable *flowtable)
6625 {
6626         const struct nlattr * const *nla = ctx->nla;
6627         struct nft_flowtable_hook flowtable_hook;
6628         struct nft_hook *hook, *next;
6629         struct nft_trans *trans;
6630         bool unregister = false;
6631         int err;
6632
6633         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
6634                                        &flowtable_hook, flowtable, false);
6635         if (err < 0)
6636                 return err;
6637
6638         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6639                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
6640                         list_del(&hook->list);
6641                         kfree(hook);
6642                 }
6643         }
6644
6645         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
6646                                                &flowtable_hook.list, flowtable);
6647         if (err < 0)
6648                 goto err_flowtable_update_hook;
6649
6650         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
6651                                 sizeof(struct nft_trans_flowtable));
6652         if (!trans) {
6653                 unregister = true;
6654                 err = -ENOMEM;
6655                 goto err_flowtable_update_hook;
6656         }
6657
6658         nft_trans_flowtable(trans) = flowtable;
6659         nft_trans_flowtable_update(trans) = true;
6660         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
6661         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
6662
6663         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6664
6665         return 0;
6666
6667 err_flowtable_update_hook:
6668         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6669                 if (unregister)
6670                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
6671                 list_del_rcu(&hook->list);
6672                 kfree_rcu(hook, rcu);
6673         }
6674
6675         return err;
6676
6677 }
6678
6679 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
6680                                   struct sk_buff *skb,
6681                                   const struct nlmsghdr *nlh,
6682                                   const struct nlattr * const nla[],
6683                                   struct netlink_ext_ack *extack)
6684 {
6685         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6686         struct nft_flowtable_hook flowtable_hook;
6687         const struct nf_flowtable_type *type;
6688         u8 genmask = nft_genmask_next(net);
6689         int family = nfmsg->nfgen_family;
6690         struct nft_flowtable *flowtable;
6691         struct nft_hook *hook, *next;
6692         struct nft_table *table;
6693         struct nft_ctx ctx;
6694         int err;
6695
6696         if (!nla[NFTA_FLOWTABLE_TABLE] ||
6697             !nla[NFTA_FLOWTABLE_NAME] ||
6698             !nla[NFTA_FLOWTABLE_HOOK])
6699                 return -EINVAL;
6700
6701         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6702                                  genmask);
6703         if (IS_ERR(table)) {
6704                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6705                 return PTR_ERR(table);
6706         }
6707
6708         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6709                                          genmask);
6710         if (IS_ERR(flowtable)) {
6711                 err = PTR_ERR(flowtable);
6712                 if (err != -ENOENT) {
6713                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6714                         return err;
6715                 }
6716         } else {
6717                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6718                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6719                         return -EEXIST;
6720                 }
6721
6722                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6723
6724                 return nft_flowtable_update(&ctx, nlh, flowtable);
6725         }
6726
6727         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6728
6729         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
6730         if (!flowtable)
6731                 return -ENOMEM;
6732
6733         flowtable->table = table;
6734         flowtable->handle = nf_tables_alloc_handle(table);
6735         INIT_LIST_HEAD(&flowtable->hook_list);
6736
6737         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
6738         if (!flowtable->name) {
6739                 err = -ENOMEM;
6740                 goto err1;
6741         }
6742
6743         type = nft_flowtable_type_get(net, family);
6744         if (IS_ERR(type)) {
6745                 err = PTR_ERR(type);
6746                 goto err2;
6747         }
6748
6749         if (nla[NFTA_FLOWTABLE_FLAGS]) {
6750                 flowtable->data.flags =
6751                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
6752                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK)
6753                         goto err3;
6754         }
6755
6756         write_pnet(&flowtable->data.net, net);
6757         flowtable->data.type = type;
6758         err = type->init(&flowtable->data);
6759         if (err < 0)
6760                 goto err3;
6761
6762         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
6763                                        &flowtable_hook, flowtable, true);
6764         if (err < 0)
6765                 goto err4;
6766
6767         list_splice(&flowtable_hook.list, &flowtable->hook_list);
6768         flowtable->data.priority = flowtable_hook.priority;
6769         flowtable->hooknum = flowtable_hook.num;
6770
6771         err = nft_register_flowtable_net_hooks(ctx.net, table,
6772                                                &flowtable->hook_list,
6773                                                flowtable);
6774         if (err < 0) {
6775                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
6776                 goto err4;
6777         }
6778
6779         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
6780         if (err < 0)
6781                 goto err5;
6782
6783         list_add_tail_rcu(&flowtable->list, &table->flowtables);
6784         table->use++;
6785
6786         return 0;
6787 err5:
6788         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
6789                 nft_unregister_flowtable_hook(net, flowtable, hook);
6790                 list_del_rcu(&hook->list);
6791                 kfree_rcu(hook, rcu);
6792         }
6793 err4:
6794         flowtable->data.type->free(&flowtable->data);
6795 err3:
6796         module_put(type->owner);
6797 err2:
6798         kfree(flowtable->name);
6799 err1:
6800         kfree(flowtable);
6801         return err;
6802 }
6803
6804 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
6805 {
6806         struct nft_hook *this, *next;
6807
6808         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
6809                 list_del(&this->list);
6810                 kfree(this);
6811         }
6812 }
6813
6814 static int nft_delflowtable_hook(struct nft_ctx *ctx,
6815                                  struct nft_flowtable *flowtable)
6816 {
6817         const struct nlattr * const *nla = ctx->nla;
6818         struct nft_flowtable_hook flowtable_hook;
6819         struct nft_hook *this, *hook;
6820         struct nft_trans *trans;
6821         int err;
6822
6823         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
6824                                        &flowtable_hook, flowtable, false);
6825         if (err < 0)
6826                 return err;
6827
6828         list_for_each_entry(this, &flowtable_hook.list, list) {
6829                 hook = nft_hook_list_find(&flowtable->hook_list, this);
6830                 if (!hook) {
6831                         err = -ENOENT;
6832                         goto err_flowtable_del_hook;
6833                 }
6834                 hook->inactive = true;
6835         }
6836
6837         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
6838                                 sizeof(struct nft_trans_flowtable));
6839         if (!trans) {
6840                 err = -ENOMEM;
6841                 goto err_flowtable_del_hook;
6842         }
6843
6844         nft_trans_flowtable(trans) = flowtable;
6845         nft_trans_flowtable_update(trans) = true;
6846         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
6847         nft_flowtable_hook_release(&flowtable_hook);
6848
6849         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6850
6851         return 0;
6852
6853 err_flowtable_del_hook:
6854         list_for_each_entry(this, &flowtable_hook.list, list) {
6855                 hook = nft_hook_list_find(&flowtable->hook_list, this);
6856                 if (!hook)
6857                         break;
6858
6859                 hook->inactive = false;
6860         }
6861         nft_flowtable_hook_release(&flowtable_hook);
6862
6863         return err;
6864 }
6865
6866 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
6867                                   struct sk_buff *skb,
6868                                   const struct nlmsghdr *nlh,
6869                                   const struct nlattr * const nla[],
6870                                   struct netlink_ext_ack *extack)
6871 {
6872         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6873         u8 genmask = nft_genmask_next(net);
6874         int family = nfmsg->nfgen_family;
6875         struct nft_flowtable *flowtable;
6876         const struct nlattr *attr;
6877         struct nft_table *table;
6878         struct nft_ctx ctx;
6879
6880         if (!nla[NFTA_FLOWTABLE_TABLE] ||
6881             (!nla[NFTA_FLOWTABLE_NAME] &&
6882              !nla[NFTA_FLOWTABLE_HANDLE]))
6883                 return -EINVAL;
6884
6885         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6886                                  genmask);
6887         if (IS_ERR(table)) {
6888                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6889                 return PTR_ERR(table);
6890         }
6891
6892         if (nla[NFTA_FLOWTABLE_HANDLE]) {
6893                 attr = nla[NFTA_FLOWTABLE_HANDLE];
6894                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
6895         } else {
6896                 attr = nla[NFTA_FLOWTABLE_NAME];
6897                 flowtable = nft_flowtable_lookup(table, attr, genmask);
6898         }
6899
6900         if (IS_ERR(flowtable)) {
6901                 NL_SET_BAD_ATTR(extack, attr);
6902                 return PTR_ERR(flowtable);
6903         }
6904
6905         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6906
6907         if (nla[NFTA_FLOWTABLE_HOOK])
6908                 return nft_delflowtable_hook(&ctx, flowtable);
6909
6910         if (flowtable->use > 0) {
6911                 NL_SET_BAD_ATTR(extack, attr);
6912                 return -EBUSY;
6913         }
6914
6915         return nft_delflowtable(&ctx, flowtable);
6916 }
6917
6918 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
6919                                          u32 portid, u32 seq, int event,
6920                                          u32 flags, int family,
6921                                          struct nft_flowtable *flowtable,
6922                                          struct list_head *hook_list)
6923 {
6924         struct nlattr *nest, *nest_devs;
6925         struct nfgenmsg *nfmsg;
6926         struct nft_hook *hook;
6927         struct nlmsghdr *nlh;
6928
6929         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6930         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
6931         if (nlh == NULL)
6932                 goto nla_put_failure;
6933
6934         nfmsg = nlmsg_data(nlh);
6935         nfmsg->nfgen_family     = family;
6936         nfmsg->version          = NFNETLINK_V0;
6937         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
6938
6939         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
6940             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
6941             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
6942             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
6943                          NFTA_FLOWTABLE_PAD) ||
6944             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
6945                 goto nla_put_failure;
6946
6947         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
6948         if (!nest)
6949                 goto nla_put_failure;
6950         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
6951             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
6952                 goto nla_put_failure;
6953
6954         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
6955         if (!nest_devs)
6956                 goto nla_put_failure;
6957
6958         list_for_each_entry_rcu(hook, hook_list, list) {
6959                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
6960                         goto nla_put_failure;
6961         }
6962         nla_nest_end(skb, nest_devs);
6963         nla_nest_end(skb, nest);
6964
6965         nlmsg_end(skb, nlh);
6966         return 0;
6967
6968 nla_put_failure:
6969         nlmsg_trim(skb, nlh);
6970         return -1;
6971 }
6972
6973 struct nft_flowtable_filter {
6974         char            *table;
6975 };
6976
6977 static int nf_tables_dump_flowtable(struct sk_buff *skb,
6978                                     struct netlink_callback *cb)
6979 {
6980         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6981         struct nft_flowtable_filter *filter = cb->data;
6982         unsigned int idx = 0, s_idx = cb->args[0];
6983         struct net *net = sock_net(skb->sk);
6984         int family = nfmsg->nfgen_family;
6985         struct nft_flowtable *flowtable;
6986         const struct nft_table *table;
6987
6988         rcu_read_lock();
6989         cb->seq = net->nft.base_seq;
6990
6991         list_for_each_entry_rcu(table, &net->nft.tables, list) {
6992                 if (family != NFPROTO_UNSPEC && family != table->family)
6993                         continue;
6994
6995                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6996                         if (!nft_is_active(net, flowtable))
6997                                 goto cont;
6998                         if (idx < s_idx)
6999                                 goto cont;
7000                         if (idx > s_idx)
7001                                 memset(&cb->args[1], 0,
7002                                        sizeof(cb->args) - sizeof(cb->args[0]));
7003                         if (filter && filter->table &&
7004                             strcmp(filter->table, table->name))
7005                                 goto cont;
7006
7007                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7008                                                           cb->nlh->nlmsg_seq,
7009                                                           NFT_MSG_NEWFLOWTABLE,
7010                                                           NLM_F_MULTI | NLM_F_APPEND,
7011                                                           table->family,
7012                                                           flowtable,
7013                                                           &flowtable->hook_list) < 0)
7014                                 goto done;
7015
7016                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7017 cont:
7018                         idx++;
7019                 }
7020         }
7021 done:
7022         rcu_read_unlock();
7023
7024         cb->args[0] = idx;
7025         return skb->len;
7026 }
7027
7028 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7029 {
7030         const struct nlattr * const *nla = cb->data;
7031         struct nft_flowtable_filter *filter = NULL;
7032
7033         if (nla[NFTA_FLOWTABLE_TABLE]) {
7034                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7035                 if (!filter)
7036                         return -ENOMEM;
7037
7038                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7039                                            GFP_ATOMIC);
7040                 if (!filter->table) {
7041                         kfree(filter);
7042                         return -ENOMEM;
7043                 }
7044         }
7045
7046         cb->data = filter;
7047         return 0;
7048 }
7049
7050 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7051 {
7052         struct nft_flowtable_filter *filter = cb->data;
7053
7054         if (!filter)
7055                 return 0;
7056
7057         kfree(filter->table);
7058         kfree(filter);
7059
7060         return 0;
7061 }
7062
7063 /* called with rcu_read_lock held */
7064 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
7065                                   struct sk_buff *skb,
7066                                   const struct nlmsghdr *nlh,
7067                                   const struct nlattr * const nla[],
7068                                   struct netlink_ext_ack *extack)
7069 {
7070         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7071         u8 genmask = nft_genmask_cur(net);
7072         int family = nfmsg->nfgen_family;
7073         struct nft_flowtable *flowtable;
7074         const struct nft_table *table;
7075         struct sk_buff *skb2;
7076         int err;
7077
7078         if (nlh->nlmsg_flags & NLM_F_DUMP) {
7079                 struct netlink_dump_control c = {
7080                         .start = nf_tables_dump_flowtable_start,
7081                         .dump = nf_tables_dump_flowtable,
7082                         .done = nf_tables_dump_flowtable_done,
7083                         .module = THIS_MODULE,
7084                         .data = (void *)nla,
7085                 };
7086
7087                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
7088         }
7089
7090         if (!nla[NFTA_FLOWTABLE_NAME])
7091                 return -EINVAL;
7092
7093         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7094                                  genmask);
7095         if (IS_ERR(table))
7096                 return PTR_ERR(table);
7097
7098         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7099                                          genmask);
7100         if (IS_ERR(flowtable))
7101                 return PTR_ERR(flowtable);
7102
7103         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7104         if (!skb2)
7105                 return -ENOMEM;
7106
7107         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7108                                             nlh->nlmsg_seq,
7109                                             NFT_MSG_NEWFLOWTABLE, 0, family,
7110                                             flowtable, &flowtable->hook_list);
7111         if (err < 0)
7112                 goto err_fill_flowtable_info;
7113
7114         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7115
7116 err_fill_flowtable_info:
7117         kfree_skb(skb2);
7118         return err;
7119 }
7120
7121 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7122                                        struct nft_flowtable *flowtable,
7123                                        struct list_head *hook_list,
7124                                        int event)
7125 {
7126         struct sk_buff *skb;
7127         int err;
7128         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
7129                               flowtable->table->name, flowtable->table->handle,
7130                               flowtable->name, flowtable->handle);
7131
7132         audit_log_nfcfg(buf,
7133                         ctx->family,
7134                         flowtable->hooknum,
7135                         event == NFT_MSG_NEWFLOWTABLE ?
7136                                 AUDIT_NFT_OP_FLOWTABLE_REGISTER :
7137                                 AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
7138                         GFP_KERNEL);
7139         kfree(buf);
7140
7141         if (!ctx->report &&
7142             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7143                 return;
7144
7145         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7146         if (skb == NULL)
7147                 goto err;
7148
7149         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7150                                             ctx->seq, event, 0,
7151                                             ctx->family, flowtable, hook_list);
7152         if (err < 0) {
7153                 kfree_skb(skb);
7154                 goto err;
7155         }
7156
7157         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
7158         return;
7159 err:
7160         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7161 }
7162
7163 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7164 {
7165         struct nft_hook *hook, *next;
7166
7167         flowtable->data.type->free(&flowtable->data);
7168         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7169                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7170                                             FLOW_BLOCK_UNBIND);
7171                 list_del_rcu(&hook->list);
7172                 kfree(hook);
7173         }
7174         kfree(flowtable->name);
7175         module_put(flowtable->data.type->owner);
7176         kfree(flowtable);
7177 }
7178
7179 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7180                                    u32 portid, u32 seq)
7181 {
7182         struct nlmsghdr *nlh;
7183         struct nfgenmsg *nfmsg;
7184         char buf[TASK_COMM_LEN];
7185         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7186
7187         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
7188         if (nlh == NULL)
7189                 goto nla_put_failure;
7190
7191         nfmsg = nlmsg_data(nlh);
7192         nfmsg->nfgen_family     = AF_UNSPEC;
7193         nfmsg->version          = NFNETLINK_V0;
7194         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
7195
7196         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
7197             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7198             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7199                 goto nla_put_failure;
7200
7201         nlmsg_end(skb, nlh);
7202         return 0;
7203
7204 nla_put_failure:
7205         nlmsg_trim(skb, nlh);
7206         return -EMSGSIZE;
7207 }
7208
7209 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7210                                 struct nft_flowtable *flowtable)
7211 {
7212         struct nft_hook *hook;
7213
7214         list_for_each_entry(hook, &flowtable->hook_list, list) {
7215                 if (hook->ops.dev != dev)
7216                         continue;
7217
7218                 /* flow_offload_netdev_event() cleans up entries for us. */
7219                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
7220                 list_del_rcu(&hook->list);
7221                 kfree_rcu(hook, rcu);
7222                 break;
7223         }
7224 }
7225
7226 static int nf_tables_flowtable_event(struct notifier_block *this,
7227                                      unsigned long event, void *ptr)
7228 {
7229         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7230         struct nft_flowtable *flowtable;
7231         struct nft_table *table;
7232         struct net *net;
7233
7234         if (event != NETDEV_UNREGISTER)
7235                 return 0;
7236
7237         net = dev_net(dev);
7238         mutex_lock(&net->nft.commit_mutex);
7239         list_for_each_entry(table, &net->nft.tables, list) {
7240                 list_for_each_entry(flowtable, &table->flowtables, list) {
7241                         nft_flowtable_event(event, dev, flowtable);
7242                 }
7243         }
7244         mutex_unlock(&net->nft.commit_mutex);
7245
7246         return NOTIFY_DONE;
7247 }
7248
7249 static struct notifier_block nf_tables_flowtable_notifier = {
7250         .notifier_call  = nf_tables_flowtable_event,
7251 };
7252
7253 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
7254                                  int event)
7255 {
7256         struct nlmsghdr *nlh = nlmsg_hdr(skb);
7257         struct sk_buff *skb2;
7258         int err;
7259
7260         audit_log_nfcfg("?:0;?:0", 0, net->nft.base_seq,
7261                         AUDIT_NFT_OP_GEN_REGISTER, GFP_KERNEL);
7262
7263         if (!nlmsg_report(nlh) &&
7264             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7265                 return;
7266
7267         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7268         if (skb2 == NULL)
7269                 goto err;
7270
7271         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7272                                       nlh->nlmsg_seq);
7273         if (err < 0) {
7274                 kfree_skb(skb2);
7275                 goto err;
7276         }
7277
7278         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7279                        nlmsg_report(nlh), GFP_KERNEL);
7280         return;
7281 err:
7282         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7283                           -ENOBUFS);
7284 }
7285
7286 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
7287                             struct sk_buff *skb, const struct nlmsghdr *nlh,
7288                             const struct nlattr * const nla[],
7289                             struct netlink_ext_ack *extack)
7290 {
7291         struct sk_buff *skb2;
7292         int err;
7293
7294         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7295         if (skb2 == NULL)
7296                 return -ENOMEM;
7297
7298         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7299                                       nlh->nlmsg_seq);
7300         if (err < 0)
7301                 goto err_fill_gen_info;
7302
7303         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7304
7305 err_fill_gen_info:
7306         kfree_skb(skb2);
7307         return err;
7308 }
7309
7310 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
7311         [NFT_MSG_NEWTABLE] = {
7312                 .call_batch     = nf_tables_newtable,
7313                 .attr_count     = NFTA_TABLE_MAX,
7314                 .policy         = nft_table_policy,
7315         },
7316         [NFT_MSG_GETTABLE] = {
7317                 .call_rcu       = nf_tables_gettable,
7318                 .attr_count     = NFTA_TABLE_MAX,
7319                 .policy         = nft_table_policy,
7320         },
7321         [NFT_MSG_DELTABLE] = {
7322                 .call_batch     = nf_tables_deltable,
7323                 .attr_count     = NFTA_TABLE_MAX,
7324                 .policy         = nft_table_policy,
7325         },
7326         [NFT_MSG_NEWCHAIN] = {
7327                 .call_batch     = nf_tables_newchain,
7328                 .attr_count     = NFTA_CHAIN_MAX,
7329                 .policy         = nft_chain_policy,
7330         },
7331         [NFT_MSG_GETCHAIN] = {
7332                 .call_rcu       = nf_tables_getchain,
7333                 .attr_count     = NFTA_CHAIN_MAX,
7334                 .policy         = nft_chain_policy,
7335         },
7336         [NFT_MSG_DELCHAIN] = {
7337                 .call_batch     = nf_tables_delchain,
7338                 .attr_count     = NFTA_CHAIN_MAX,
7339                 .policy         = nft_chain_policy,
7340         },
7341         [NFT_MSG_NEWRULE] = {
7342                 .call_batch     = nf_tables_newrule,
7343                 .attr_count     = NFTA_RULE_MAX,
7344                 .policy         = nft_rule_policy,
7345         },
7346         [NFT_MSG_GETRULE] = {
7347                 .call_rcu       = nf_tables_getrule,
7348                 .attr_count     = NFTA_RULE_MAX,
7349                 .policy         = nft_rule_policy,
7350         },
7351         [NFT_MSG_DELRULE] = {
7352                 .call_batch     = nf_tables_delrule,
7353                 .attr_count     = NFTA_RULE_MAX,
7354                 .policy         = nft_rule_policy,
7355         },
7356         [NFT_MSG_NEWSET] = {
7357                 .call_batch     = nf_tables_newset,
7358                 .attr_count     = NFTA_SET_MAX,
7359                 .policy         = nft_set_policy,
7360         },
7361         [NFT_MSG_GETSET] = {
7362                 .call_rcu       = nf_tables_getset,
7363                 .attr_count     = NFTA_SET_MAX,
7364                 .policy         = nft_set_policy,
7365         },
7366         [NFT_MSG_DELSET] = {
7367                 .call_batch     = nf_tables_delset,
7368                 .attr_count     = NFTA_SET_MAX,
7369                 .policy         = nft_set_policy,
7370         },
7371         [NFT_MSG_NEWSETELEM] = {
7372                 .call_batch     = nf_tables_newsetelem,
7373                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7374                 .policy         = nft_set_elem_list_policy,
7375         },
7376         [NFT_MSG_GETSETELEM] = {
7377                 .call_rcu       = nf_tables_getsetelem,
7378                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7379                 .policy         = nft_set_elem_list_policy,
7380         },
7381         [NFT_MSG_DELSETELEM] = {
7382                 .call_batch     = nf_tables_delsetelem,
7383                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7384                 .policy         = nft_set_elem_list_policy,
7385         },
7386         [NFT_MSG_GETGEN] = {
7387                 .call_rcu       = nf_tables_getgen,
7388         },
7389         [NFT_MSG_NEWOBJ] = {
7390                 .call_batch     = nf_tables_newobj,
7391                 .attr_count     = NFTA_OBJ_MAX,
7392                 .policy         = nft_obj_policy,
7393         },
7394         [NFT_MSG_GETOBJ] = {
7395                 .call_rcu       = nf_tables_getobj,
7396                 .attr_count     = NFTA_OBJ_MAX,
7397                 .policy         = nft_obj_policy,
7398         },
7399         [NFT_MSG_DELOBJ] = {
7400                 .call_batch     = nf_tables_delobj,
7401                 .attr_count     = NFTA_OBJ_MAX,
7402                 .policy         = nft_obj_policy,
7403         },
7404         [NFT_MSG_GETOBJ_RESET] = {
7405                 .call_rcu       = nf_tables_getobj,
7406                 .attr_count     = NFTA_OBJ_MAX,
7407                 .policy         = nft_obj_policy,
7408         },
7409         [NFT_MSG_NEWFLOWTABLE] = {
7410                 .call_batch     = nf_tables_newflowtable,
7411                 .attr_count     = NFTA_FLOWTABLE_MAX,
7412                 .policy         = nft_flowtable_policy,
7413         },
7414         [NFT_MSG_GETFLOWTABLE] = {
7415                 .call_rcu       = nf_tables_getflowtable,
7416                 .attr_count     = NFTA_FLOWTABLE_MAX,
7417                 .policy         = nft_flowtable_policy,
7418         },
7419         [NFT_MSG_DELFLOWTABLE] = {
7420                 .call_batch     = nf_tables_delflowtable,
7421                 .attr_count     = NFTA_FLOWTABLE_MAX,
7422                 .policy         = nft_flowtable_policy,
7423         },
7424 };
7425
7426 static int nf_tables_validate(struct net *net)
7427 {
7428         struct nft_table *table;
7429
7430         switch (net->nft.validate_state) {
7431         case NFT_VALIDATE_SKIP:
7432                 break;
7433         case NFT_VALIDATE_NEED:
7434                 nft_validate_state_update(net, NFT_VALIDATE_DO);
7435                 fallthrough;
7436         case NFT_VALIDATE_DO:
7437                 list_for_each_entry(table, &net->nft.tables, list) {
7438                         if (nft_table_validate(net, table) < 0)
7439                                 return -EAGAIN;
7440                 }
7441                 break;
7442         }
7443
7444         return 0;
7445 }
7446
7447 /* a drop policy has to be deferred until all rules have been activated,
7448  * otherwise a large ruleset that contains a drop-policy base chain will
7449  * cause all packets to get dropped until the full transaction has been
7450  * processed.
7451  *
7452  * We defer the drop policy until the transaction has been finalized.
7453  */
7454 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
7455 {
7456         struct nft_base_chain *basechain;
7457
7458         if (nft_trans_chain_policy(trans) != NF_DROP)
7459                 return;
7460
7461         if (!nft_is_base_chain(trans->ctx.chain))
7462                 return;
7463
7464         basechain = nft_base_chain(trans->ctx.chain);
7465         basechain->policy = NF_DROP;
7466 }
7467
7468 static void nft_chain_commit_update(struct nft_trans *trans)
7469 {
7470         struct nft_base_chain *basechain;
7471
7472         if (nft_trans_chain_name(trans)) {
7473                 rhltable_remove(&trans->ctx.table->chains_ht,
7474                                 &trans->ctx.chain->rhlhead,
7475                                 nft_chain_ht_params);
7476                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
7477                 rhltable_insert_key(&trans->ctx.table->chains_ht,
7478                                     trans->ctx.chain->name,
7479                                     &trans->ctx.chain->rhlhead,
7480                                     nft_chain_ht_params);
7481         }
7482
7483         if (!nft_is_base_chain(trans->ctx.chain))
7484                 return;
7485
7486         nft_chain_stats_replace(trans);
7487
7488         basechain = nft_base_chain(trans->ctx.chain);
7489
7490         switch (nft_trans_chain_policy(trans)) {
7491         case NF_DROP:
7492         case NF_ACCEPT:
7493                 basechain->policy = nft_trans_chain_policy(trans);
7494                 break;
7495         }
7496 }
7497
7498 static void nft_obj_commit_update(struct nft_trans *trans)
7499 {
7500         struct nft_object *newobj;
7501         struct nft_object *obj;
7502
7503         obj = nft_trans_obj(trans);
7504         newobj = nft_trans_obj_newobj(trans);
7505
7506         if (obj->ops->update)
7507                 obj->ops->update(obj, newobj);
7508
7509         kfree(newobj);
7510 }
7511
7512 static void nft_commit_release(struct nft_trans *trans)
7513 {
7514         switch (trans->msg_type) {
7515         case NFT_MSG_DELTABLE:
7516                 nf_tables_table_destroy(&trans->ctx);
7517                 break;
7518         case NFT_MSG_NEWCHAIN:
7519                 free_percpu(nft_trans_chain_stats(trans));
7520                 kfree(nft_trans_chain_name(trans));
7521                 break;
7522         case NFT_MSG_DELCHAIN:
7523                 nf_tables_chain_destroy(&trans->ctx);
7524                 break;
7525         case NFT_MSG_DELRULE:
7526                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
7527                 break;
7528         case NFT_MSG_DELSET:
7529                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
7530                 break;
7531         case NFT_MSG_DELSETELEM:
7532                 nf_tables_set_elem_destroy(&trans->ctx,
7533                                            nft_trans_elem_set(trans),
7534                                            nft_trans_elem(trans).priv);
7535                 break;
7536         case NFT_MSG_DELOBJ:
7537                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
7538                 break;
7539         case NFT_MSG_DELFLOWTABLE:
7540                 if (nft_trans_flowtable_update(trans))
7541                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
7542                 else
7543                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
7544                 break;
7545         }
7546
7547         if (trans->put_net)
7548                 put_net(trans->ctx.net);
7549
7550         kfree(trans);
7551 }
7552
7553 static void nf_tables_trans_destroy_work(struct work_struct *w)
7554 {
7555         struct nft_trans *trans, *next;
7556         LIST_HEAD(head);
7557
7558         spin_lock(&nf_tables_destroy_list_lock);
7559         list_splice_init(&nf_tables_destroy_list, &head);
7560         spin_unlock(&nf_tables_destroy_list_lock);
7561
7562         if (list_empty(&head))
7563                 return;
7564
7565         synchronize_rcu();
7566
7567         list_for_each_entry_safe(trans, next, &head, list) {
7568                 list_del(&trans->list);
7569                 nft_commit_release(trans);
7570         }
7571 }
7572
7573 void nf_tables_trans_destroy_flush_work(void)
7574 {
7575         flush_work(&trans_destroy_work);
7576 }
7577 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
7578
7579 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
7580 {
7581         struct nft_rule *rule;
7582         unsigned int alloc = 0;
7583         int i;
7584
7585         /* already handled or inactive chain? */
7586         if (chain->rules_next || !nft_is_active_next(net, chain))
7587                 return 0;
7588
7589         rule = list_entry(&chain->rules, struct nft_rule, list);
7590         i = 0;
7591
7592         list_for_each_entry_continue(rule, &chain->rules, list) {
7593                 if (nft_is_active_next(net, rule))
7594                         alloc++;
7595         }
7596
7597         chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
7598         if (!chain->rules_next)
7599                 return -ENOMEM;
7600
7601         list_for_each_entry_continue(rule, &chain->rules, list) {
7602                 if (nft_is_active_next(net, rule))
7603                         chain->rules_next[i++] = rule;
7604         }
7605
7606         chain->rules_next[i] = NULL;
7607         return 0;
7608 }
7609
7610 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
7611 {
7612         struct nft_trans *trans, *next;
7613
7614         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7615                 struct nft_chain *chain = trans->ctx.chain;
7616
7617                 if (trans->msg_type == NFT_MSG_NEWRULE ||
7618                     trans->msg_type == NFT_MSG_DELRULE) {
7619                         kvfree(chain->rules_next);
7620                         chain->rules_next = NULL;
7621                 }
7622         }
7623 }
7624
7625 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
7626 {
7627         struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
7628
7629         kvfree(o->start);
7630 }
7631
7632 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
7633 {
7634         struct nft_rule **r = rules;
7635         struct nft_rules_old *old;
7636
7637         while (*r)
7638                 r++;
7639
7640         r++;    /* rcu_head is after end marker */
7641         old = (void *) r;
7642         old->start = rules;
7643
7644         call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
7645 }
7646
7647 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
7648 {
7649         struct nft_rule **g0, **g1;
7650         bool next_genbit;
7651
7652         next_genbit = nft_gencursor_next(net);
7653
7654         g0 = rcu_dereference_protected(chain->rules_gen_0,
7655                                        lockdep_commit_lock_is_held(net));
7656         g1 = rcu_dereference_protected(chain->rules_gen_1,
7657                                        lockdep_commit_lock_is_held(net));
7658
7659         /* No changes to this chain? */
7660         if (chain->rules_next == NULL) {
7661                 /* chain had no change in last or next generation */
7662                 if (g0 == g1)
7663                         return;
7664                 /*
7665                  * chain had no change in this generation; make sure next
7666                  * one uses same rules as current generation.
7667                  */
7668                 if (next_genbit) {
7669                         rcu_assign_pointer(chain->rules_gen_1, g0);
7670                         nf_tables_commit_chain_free_rules_old(g1);
7671                 } else {
7672                         rcu_assign_pointer(chain->rules_gen_0, g1);
7673                         nf_tables_commit_chain_free_rules_old(g0);
7674                 }
7675
7676                 return;
7677         }
7678
7679         if (next_genbit)
7680                 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
7681         else
7682                 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
7683
7684         chain->rules_next = NULL;
7685
7686         if (g0 == g1)
7687                 return;
7688
7689         if (next_genbit)
7690                 nf_tables_commit_chain_free_rules_old(g1);
7691         else
7692                 nf_tables_commit_chain_free_rules_old(g0);
7693 }
7694
7695 static void nft_obj_del(struct nft_object *obj)
7696 {
7697         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
7698         list_del_rcu(&obj->list);
7699 }
7700
7701 void nft_chain_del(struct nft_chain *chain)
7702 {
7703         struct nft_table *table = chain->table;
7704
7705         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
7706                                      nft_chain_ht_params));
7707         list_del_rcu(&chain->list);
7708 }
7709
7710 static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
7711                                     struct list_head *hook_list)
7712 {
7713         struct nft_hook *hook, *next;
7714
7715         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7716                 if (hook->inactive)
7717                         list_move(&hook->list, hook_list);
7718         }
7719 }
7720
7721 static void nf_tables_module_autoload_cleanup(struct net *net)
7722 {
7723         struct nft_module_request *req, *next;
7724
7725         WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
7726         list_for_each_entry_safe(req, next, &net->nft.module_list, list) {
7727                 WARN_ON_ONCE(!req->done);
7728                 list_del(&req->list);
7729                 kfree(req);
7730         }
7731 }
7732
7733 static void nf_tables_commit_release(struct net *net)
7734 {
7735         struct nft_trans *trans;
7736
7737         /* all side effects have to be made visible.
7738          * For example, if a chain named 'foo' has been deleted, a
7739          * new transaction must not find it anymore.
7740          *
7741          * Memory reclaim happens asynchronously from work queue
7742          * to prevent expensive synchronize_rcu() in commit phase.
7743          */
7744         if (list_empty(&net->nft.commit_list)) {
7745                 nf_tables_module_autoload_cleanup(net);
7746                 mutex_unlock(&net->nft.commit_mutex);
7747                 return;
7748         }
7749
7750         trans = list_last_entry(&net->nft.commit_list,
7751                                 struct nft_trans, list);
7752         get_net(trans->ctx.net);
7753         WARN_ON_ONCE(trans->put_net);
7754
7755         trans->put_net = true;
7756         spin_lock(&nf_tables_destroy_list_lock);
7757         list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
7758         spin_unlock(&nf_tables_destroy_list_lock);
7759
7760         nf_tables_module_autoload_cleanup(net);
7761         schedule_work(&trans_destroy_work);
7762
7763         mutex_unlock(&net->nft.commit_mutex);
7764 }
7765
7766 static void nft_commit_notify(struct net *net, u32 portid)
7767 {
7768         struct sk_buff *batch_skb = NULL, *nskb, *skb;
7769         unsigned char *data;
7770         int len;
7771
7772         list_for_each_entry_safe(skb, nskb, &net->nft.notify_list, list) {
7773                 if (!batch_skb) {
7774 new_batch:
7775                         batch_skb = skb;
7776                         len = NLMSG_GOODSIZE - skb->len;
7777                         list_del(&skb->list);
7778                         continue;
7779                 }
7780                 len -= skb->len;
7781                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
7782                         data = skb_put(batch_skb, skb->len);
7783                         memcpy(data, skb->data, skb->len);
7784                         list_del(&skb->list);
7785                         kfree_skb(skb);
7786                         continue;
7787                 }
7788                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
7789                                NFT_CB(batch_skb).report, GFP_KERNEL);
7790                 goto new_batch;
7791         }
7792
7793         if (batch_skb) {
7794                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
7795                                NFT_CB(batch_skb).report, GFP_KERNEL);
7796         }
7797
7798         WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
7799 }
7800
7801 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
7802 {
7803         struct nft_trans *trans, *next;
7804         struct nft_trans_elem *te;
7805         struct nft_chain *chain;
7806         struct nft_table *table;
7807         int err;
7808
7809         if (list_empty(&net->nft.commit_list)) {
7810                 mutex_unlock(&net->nft.commit_mutex);
7811                 return 0;
7812         }
7813
7814         /* 0. Validate ruleset, otherwise roll back for error reporting. */
7815         if (nf_tables_validate(net) < 0)
7816                 return -EAGAIN;
7817
7818         err = nft_flow_rule_offload_commit(net);
7819         if (err < 0)
7820                 return err;
7821
7822         /* 1.  Allocate space for next generation rules_gen_X[] */
7823         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7824                 int ret;
7825
7826                 if (trans->msg_type == NFT_MSG_NEWRULE ||
7827                     trans->msg_type == NFT_MSG_DELRULE) {
7828                         chain = trans->ctx.chain;
7829
7830                         ret = nf_tables_commit_chain_prepare(net, chain);
7831                         if (ret < 0) {
7832                                 nf_tables_commit_chain_prepare_cancel(net);
7833                                 return ret;
7834                         }
7835                 }
7836         }
7837
7838         /* step 2.  Make rules_gen_X visible to packet path */
7839         list_for_each_entry(table, &net->nft.tables, list) {
7840                 list_for_each_entry(chain, &table->chains, list)
7841                         nf_tables_commit_chain(net, chain);
7842         }
7843
7844         /*
7845          * Bump generation counter, invalidate any dump in progress.
7846          * Cannot fail after this point.
7847          */
7848         while (++net->nft.base_seq == 0);
7849
7850         /* step 3. Start new generation, rules_gen_X now in use. */
7851         net->nft.gencursor = nft_gencursor_next(net);
7852
7853         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7854                 switch (trans->msg_type) {
7855                 case NFT_MSG_NEWTABLE:
7856                         if (nft_trans_table_update(trans)) {
7857                                 if (!nft_trans_table_enable(trans)) {
7858                                         nf_tables_table_disable(net,
7859                                                                 trans->ctx.table);
7860                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
7861                                 }
7862                         } else {
7863                                 nft_clear(net, trans->ctx.table);
7864                         }
7865                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
7866                         nft_trans_destroy(trans);
7867                         break;
7868                 case NFT_MSG_DELTABLE:
7869                         list_del_rcu(&trans->ctx.table->list);
7870                         nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
7871                         break;
7872                 case NFT_MSG_NEWCHAIN:
7873                         if (nft_trans_chain_update(trans)) {
7874                                 nft_chain_commit_update(trans);
7875                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
7876                                 /* trans destroyed after rcu grace period */
7877                         } else {
7878                                 nft_chain_commit_drop_policy(trans);
7879                                 nft_clear(net, trans->ctx.chain);
7880                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
7881                                 nft_trans_destroy(trans);
7882                         }
7883                         break;
7884                 case NFT_MSG_DELCHAIN:
7885                         nft_chain_del(trans->ctx.chain);
7886                         nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
7887                         nf_tables_unregister_hook(trans->ctx.net,
7888                                                   trans->ctx.table,
7889                                                   trans->ctx.chain);
7890                         break;
7891                 case NFT_MSG_NEWRULE:
7892                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
7893                         nf_tables_rule_notify(&trans->ctx,
7894                                               nft_trans_rule(trans),
7895                                               NFT_MSG_NEWRULE);
7896                         nft_trans_destroy(trans);
7897                         break;
7898                 case NFT_MSG_DELRULE:
7899                         list_del_rcu(&nft_trans_rule(trans)->list);
7900                         nf_tables_rule_notify(&trans->ctx,
7901                                               nft_trans_rule(trans),
7902                                               NFT_MSG_DELRULE);
7903                         nft_rule_expr_deactivate(&trans->ctx,
7904                                                  nft_trans_rule(trans),
7905                                                  NFT_TRANS_COMMIT);
7906                         break;
7907                 case NFT_MSG_NEWSET:
7908                         nft_clear(net, nft_trans_set(trans));
7909                         /* This avoids hitting -EBUSY when deleting the table
7910                          * from the transaction.
7911                          */
7912                         if (nft_set_is_anonymous(nft_trans_set(trans)) &&
7913                             !list_empty(&nft_trans_set(trans)->bindings))
7914                                 trans->ctx.table->use--;
7915
7916                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
7917                                              NFT_MSG_NEWSET, GFP_KERNEL);
7918                         nft_trans_destroy(trans);
7919                         break;
7920                 case NFT_MSG_DELSET:
7921                         list_del_rcu(&nft_trans_set(trans)->list);
7922                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
7923                                              NFT_MSG_DELSET, GFP_KERNEL);
7924                         break;
7925                 case NFT_MSG_NEWSETELEM:
7926                         te = (struct nft_trans_elem *)trans->data;
7927
7928                         te->set->ops->activate(net, te->set, &te->elem);
7929                         nf_tables_setelem_notify(&trans->ctx, te->set,
7930                                                  &te->elem,
7931                                                  NFT_MSG_NEWSETELEM, 0);
7932                         nft_trans_destroy(trans);
7933                         break;
7934                 case NFT_MSG_DELSETELEM:
7935                         te = (struct nft_trans_elem *)trans->data;
7936
7937                         nf_tables_setelem_notify(&trans->ctx, te->set,
7938                                                  &te->elem,
7939                                                  NFT_MSG_DELSETELEM, 0);
7940                         te->set->ops->remove(net, te->set, &te->elem);
7941                         atomic_dec(&te->set->nelems);
7942                         te->set->ndeact--;
7943                         break;
7944                 case NFT_MSG_NEWOBJ:
7945                         if (nft_trans_obj_update(trans)) {
7946                                 nft_obj_commit_update(trans);
7947                                 nf_tables_obj_notify(&trans->ctx,
7948                                                      nft_trans_obj(trans),
7949                                                      NFT_MSG_NEWOBJ);
7950                         } else {
7951                                 nft_clear(net, nft_trans_obj(trans));
7952                                 nf_tables_obj_notify(&trans->ctx,
7953                                                      nft_trans_obj(trans),
7954                                                      NFT_MSG_NEWOBJ);
7955                                 nft_trans_destroy(trans);
7956                         }
7957                         break;
7958                 case NFT_MSG_DELOBJ:
7959                         nft_obj_del(nft_trans_obj(trans));
7960                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
7961                                              NFT_MSG_DELOBJ);
7962                         break;
7963                 case NFT_MSG_NEWFLOWTABLE:
7964                         if (nft_trans_flowtable_update(trans)) {
7965                                 nf_tables_flowtable_notify(&trans->ctx,
7966                                                            nft_trans_flowtable(trans),
7967                                                            &nft_trans_flowtable_hooks(trans),
7968                                                            NFT_MSG_NEWFLOWTABLE);
7969                                 list_splice(&nft_trans_flowtable_hooks(trans),
7970                                             &nft_trans_flowtable(trans)->hook_list);
7971                         } else {
7972                                 nft_clear(net, nft_trans_flowtable(trans));
7973                                 nf_tables_flowtable_notify(&trans->ctx,
7974                                                            nft_trans_flowtable(trans),
7975                                                            &nft_trans_flowtable(trans)->hook_list,
7976                                                            NFT_MSG_NEWFLOWTABLE);
7977                         }
7978                         nft_trans_destroy(trans);
7979                         break;
7980                 case NFT_MSG_DELFLOWTABLE:
7981                         if (nft_trans_flowtable_update(trans)) {
7982                                 nft_flowtable_hooks_del(nft_trans_flowtable(trans),
7983                                                         &nft_trans_flowtable_hooks(trans));
7984                                 nf_tables_flowtable_notify(&trans->ctx,
7985                                                            nft_trans_flowtable(trans),
7986                                                            &nft_trans_flowtable_hooks(trans),
7987                                                            NFT_MSG_DELFLOWTABLE);
7988                                 nft_unregister_flowtable_net_hooks(net,
7989                                                                    &nft_trans_flowtable_hooks(trans));
7990                         } else {
7991                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
7992                                 nf_tables_flowtable_notify(&trans->ctx,
7993                                                            nft_trans_flowtable(trans),
7994                                                            &nft_trans_flowtable(trans)->hook_list,
7995                                                            NFT_MSG_DELFLOWTABLE);
7996                                 nft_unregister_flowtable_net_hooks(net,
7997                                                 &nft_trans_flowtable(trans)->hook_list);
7998                         }
7999                         break;
8000                 }
8001         }
8002
8003         nft_commit_notify(net, NETLINK_CB(skb).portid);
8004         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8005         nf_tables_commit_release(net);
8006
8007         return 0;
8008 }
8009
8010 static void nf_tables_module_autoload(struct net *net)
8011 {
8012         struct nft_module_request *req, *next;
8013         LIST_HEAD(module_list);
8014
8015         list_splice_init(&net->nft.module_list, &module_list);
8016         mutex_unlock(&net->nft.commit_mutex);
8017         list_for_each_entry_safe(req, next, &module_list, list) {
8018                 request_module("%s", req->module);
8019                 req->done = true;
8020         }
8021         mutex_lock(&net->nft.commit_mutex);
8022         list_splice(&module_list, &net->nft.module_list);
8023 }
8024
8025 static void nf_tables_abort_release(struct nft_trans *trans)
8026 {
8027         switch (trans->msg_type) {
8028         case NFT_MSG_NEWTABLE:
8029                 nf_tables_table_destroy(&trans->ctx);
8030                 break;
8031         case NFT_MSG_NEWCHAIN:
8032                 nf_tables_chain_destroy(&trans->ctx);
8033                 break;
8034         case NFT_MSG_NEWRULE:
8035                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8036                 break;
8037         case NFT_MSG_NEWSET:
8038                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8039                 break;
8040         case NFT_MSG_NEWSETELEM:
8041                 nft_set_elem_destroy(nft_trans_elem_set(trans),
8042                                      nft_trans_elem(trans).priv, true);
8043                 break;
8044         case NFT_MSG_NEWOBJ:
8045                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8046                 break;
8047         case NFT_MSG_NEWFLOWTABLE:
8048                 if (nft_trans_flowtable_update(trans))
8049                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8050                 else
8051                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8052                 break;
8053         }
8054         kfree(trans);
8055 }
8056
8057 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
8058 {
8059         struct nft_trans *trans, *next;
8060         struct nft_trans_elem *te;
8061         struct nft_hook *hook;
8062
8063         if (action == NFNL_ABORT_VALIDATE &&
8064             nf_tables_validate(net) < 0)
8065                 return -EAGAIN;
8066
8067         list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
8068                                          list) {
8069                 switch (trans->msg_type) {
8070                 case NFT_MSG_NEWTABLE:
8071                         if (nft_trans_table_update(trans)) {
8072                                 if (nft_trans_table_enable(trans)) {
8073                                         nf_tables_table_disable(net,
8074                                                                 trans->ctx.table);
8075                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8076                                 }
8077                                 nft_trans_destroy(trans);
8078                         } else {
8079                                 list_del_rcu(&trans->ctx.table->list);
8080                         }
8081                         break;
8082                 case NFT_MSG_DELTABLE:
8083                         nft_clear(trans->ctx.net, trans->ctx.table);
8084                         nft_trans_destroy(trans);
8085                         break;
8086                 case NFT_MSG_NEWCHAIN:
8087                         if (nft_trans_chain_update(trans)) {
8088                                 free_percpu(nft_trans_chain_stats(trans));
8089                                 kfree(nft_trans_chain_name(trans));
8090                                 nft_trans_destroy(trans);
8091                         } else {
8092                                 if (nft_chain_is_bound(trans->ctx.chain)) {
8093                                         nft_trans_destroy(trans);
8094                                         break;
8095                                 }
8096                                 trans->ctx.table->use--;
8097                                 nft_chain_del(trans->ctx.chain);
8098                                 nf_tables_unregister_hook(trans->ctx.net,
8099                                                           trans->ctx.table,
8100                                                           trans->ctx.chain);
8101                         }
8102                         break;
8103                 case NFT_MSG_DELCHAIN:
8104                         trans->ctx.table->use++;
8105                         nft_clear(trans->ctx.net, trans->ctx.chain);
8106                         nft_trans_destroy(trans);
8107                         break;
8108                 case NFT_MSG_NEWRULE:
8109                         trans->ctx.chain->use--;
8110                         list_del_rcu(&nft_trans_rule(trans)->list);
8111                         nft_rule_expr_deactivate(&trans->ctx,
8112                                                  nft_trans_rule(trans),
8113                                                  NFT_TRANS_ABORT);
8114                         break;
8115                 case NFT_MSG_DELRULE:
8116                         trans->ctx.chain->use++;
8117                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8118                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
8119                         nft_trans_destroy(trans);
8120                         break;
8121                 case NFT_MSG_NEWSET:
8122                         trans->ctx.table->use--;
8123                         if (nft_trans_set_bound(trans)) {
8124                                 nft_trans_destroy(trans);
8125                                 break;
8126                         }
8127                         list_del_rcu(&nft_trans_set(trans)->list);
8128                         break;
8129                 case NFT_MSG_DELSET:
8130                         trans->ctx.table->use++;
8131                         nft_clear(trans->ctx.net, nft_trans_set(trans));
8132                         nft_trans_destroy(trans);
8133                         break;
8134                 case NFT_MSG_NEWSETELEM:
8135                         if (nft_trans_elem_set_bound(trans)) {
8136                                 nft_trans_destroy(trans);
8137                                 break;
8138                         }
8139                         te = (struct nft_trans_elem *)trans->data;
8140                         te->set->ops->remove(net, te->set, &te->elem);
8141                         atomic_dec(&te->set->nelems);
8142                         break;
8143                 case NFT_MSG_DELSETELEM:
8144                         te = (struct nft_trans_elem *)trans->data;
8145
8146                         nft_set_elem_activate(net, te->set, &te->elem);
8147                         te->set->ops->activate(net, te->set, &te->elem);
8148                         te->set->ndeact--;
8149
8150                         nft_trans_destroy(trans);
8151                         break;
8152                 case NFT_MSG_NEWOBJ:
8153                         if (nft_trans_obj_update(trans)) {
8154                                 kfree(nft_trans_obj_newobj(trans));
8155                                 nft_trans_destroy(trans);
8156                         } else {
8157                                 trans->ctx.table->use--;
8158                                 nft_obj_del(nft_trans_obj(trans));
8159                         }
8160                         break;
8161                 case NFT_MSG_DELOBJ:
8162                         trans->ctx.table->use++;
8163                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
8164                         nft_trans_destroy(trans);
8165                         break;
8166                 case NFT_MSG_NEWFLOWTABLE:
8167                         if (nft_trans_flowtable_update(trans)) {
8168                                 nft_unregister_flowtable_net_hooks(net,
8169                                                 &nft_trans_flowtable_hooks(trans));
8170                         } else {
8171                                 trans->ctx.table->use--;
8172                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8173                                 nft_unregister_flowtable_net_hooks(net,
8174                                                 &nft_trans_flowtable(trans)->hook_list);
8175                         }
8176                         break;
8177                 case NFT_MSG_DELFLOWTABLE:
8178                         if (nft_trans_flowtable_update(trans)) {
8179                                 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
8180                                         hook->inactive = false;
8181                         } else {
8182                                 trans->ctx.table->use++;
8183                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
8184                         }
8185                         nft_trans_destroy(trans);
8186                         break;
8187                 }
8188         }
8189
8190         synchronize_rcu();
8191
8192         list_for_each_entry_safe_reverse(trans, next,
8193                                          &net->nft.commit_list, list) {
8194                 list_del(&trans->list);
8195                 nf_tables_abort_release(trans);
8196         }
8197
8198         if (action == NFNL_ABORT_AUTOLOAD)
8199                 nf_tables_module_autoload(net);
8200         else
8201                 nf_tables_module_autoload_cleanup(net);
8202
8203         return 0;
8204 }
8205
8206 static void nf_tables_cleanup(struct net *net)
8207 {
8208         nft_validate_state_update(net, NFT_VALIDATE_SKIP);
8209 }
8210
8211 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
8212                            enum nfnl_abort_action action)
8213 {
8214         int ret = __nf_tables_abort(net, action);
8215
8216         mutex_unlock(&net->nft.commit_mutex);
8217
8218         return ret;
8219 }
8220
8221 static bool nf_tables_valid_genid(struct net *net, u32 genid)
8222 {
8223         bool genid_ok;
8224
8225         mutex_lock(&net->nft.commit_mutex);
8226
8227         genid_ok = genid == 0 || net->nft.base_seq == genid;
8228         if (!genid_ok)
8229                 mutex_unlock(&net->nft.commit_mutex);
8230
8231         /* else, commit mutex has to be released by commit or abort function */
8232         return genid_ok;
8233 }
8234
8235 static const struct nfnetlink_subsystem nf_tables_subsys = {
8236         .name           = "nf_tables",
8237         .subsys_id      = NFNL_SUBSYS_NFTABLES,
8238         .cb_count       = NFT_MSG_MAX,
8239         .cb             = nf_tables_cb,
8240         .commit         = nf_tables_commit,
8241         .abort          = nf_tables_abort,
8242         .cleanup        = nf_tables_cleanup,
8243         .valid_genid    = nf_tables_valid_genid,
8244         .owner          = THIS_MODULE,
8245 };
8246
8247 int nft_chain_validate_dependency(const struct nft_chain *chain,
8248                                   enum nft_chain_types type)
8249 {
8250         const struct nft_base_chain *basechain;
8251
8252         if (nft_is_base_chain(chain)) {
8253                 basechain = nft_base_chain(chain);
8254                 if (basechain->type->type != type)
8255                         return -EOPNOTSUPP;
8256         }
8257         return 0;
8258 }
8259 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
8260
8261 int nft_chain_validate_hooks(const struct nft_chain *chain,
8262                              unsigned int hook_flags)
8263 {
8264         struct nft_base_chain *basechain;
8265
8266         if (nft_is_base_chain(chain)) {
8267                 basechain = nft_base_chain(chain);
8268
8269                 if ((1 << basechain->ops.hooknum) & hook_flags)
8270                         return 0;
8271
8272                 return -EOPNOTSUPP;
8273         }
8274
8275         return 0;
8276 }
8277 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
8278
8279 /*
8280  * Loop detection - walk through the ruleset beginning at the destination chain
8281  * of a new jump until either the source chain is reached (loop) or all
8282  * reachable chains have been traversed.
8283  *
8284  * The loop check is performed whenever a new jump verdict is added to an
8285  * expression or verdict map or a verdict map is bound to a new chain.
8286  */
8287
8288 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8289                                  const struct nft_chain *chain);
8290
8291 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
8292                                         struct nft_set *set,
8293                                         const struct nft_set_iter *iter,
8294                                         struct nft_set_elem *elem)
8295 {
8296         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
8297         const struct nft_data *data;
8298
8299         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
8300             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
8301                 return 0;
8302
8303         data = nft_set_ext_data(ext);
8304         switch (data->verdict.code) {
8305         case NFT_JUMP:
8306         case NFT_GOTO:
8307                 return nf_tables_check_loops(ctx, data->verdict.chain);
8308         default:
8309                 return 0;
8310         }
8311 }
8312
8313 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8314                                  const struct nft_chain *chain)
8315 {
8316         const struct nft_rule *rule;
8317         const struct nft_expr *expr, *last;
8318         struct nft_set *set;
8319         struct nft_set_binding *binding;
8320         struct nft_set_iter iter;
8321
8322         if (ctx->chain == chain)
8323                 return -ELOOP;
8324
8325         list_for_each_entry(rule, &chain->rules, list) {
8326                 nft_rule_for_each_expr(expr, last, rule) {
8327                         struct nft_immediate_expr *priv;
8328                         const struct nft_data *data;
8329                         int err;
8330
8331                         if (strcmp(expr->ops->type->name, "immediate"))
8332                                 continue;
8333
8334                         priv = nft_expr_priv(expr);
8335                         if (priv->dreg != NFT_REG_VERDICT)
8336                                 continue;
8337
8338                         data = &priv->data;
8339                         switch (data->verdict.code) {
8340                         case NFT_JUMP:
8341                         case NFT_GOTO:
8342                                 err = nf_tables_check_loops(ctx,
8343                                                         data->verdict.chain);
8344                                 if (err < 0)
8345                                         return err;
8346                         default:
8347                                 break;
8348                         }
8349                 }
8350         }
8351
8352         list_for_each_entry(set, &ctx->table->sets, list) {
8353                 if (!nft_is_active_next(ctx->net, set))
8354                         continue;
8355                 if (!(set->flags & NFT_SET_MAP) ||
8356                     set->dtype != NFT_DATA_VERDICT)
8357                         continue;
8358
8359                 list_for_each_entry(binding, &set->bindings, list) {
8360                         if (!(binding->flags & NFT_SET_MAP) ||
8361                             binding->chain != chain)
8362                                 continue;
8363
8364                         iter.genmask    = nft_genmask_next(ctx->net);
8365                         iter.skip       = 0;
8366                         iter.count      = 0;
8367                         iter.err        = 0;
8368                         iter.fn         = nf_tables_loop_check_setelem;
8369
8370                         set->ops->walk(ctx, set, &iter);
8371                         if (iter.err < 0)
8372                                 return iter.err;
8373                 }
8374         }
8375
8376         return 0;
8377 }
8378
8379 /**
8380  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
8381  *
8382  *      @attr: netlink attribute to fetch value from
8383  *      @max: maximum value to be stored in dest
8384  *      @dest: pointer to the variable
8385  *
8386  *      Parse, check and store a given u32 netlink attribute into variable.
8387  *      This function returns -ERANGE if the value goes over maximum value.
8388  *      Otherwise a 0 is returned and the attribute value is stored in the
8389  *      destination variable.
8390  */
8391 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
8392 {
8393         u32 val;
8394
8395         val = ntohl(nla_get_be32(attr));
8396         if (val > max)
8397                 return -ERANGE;
8398
8399         *dest = val;
8400         return 0;
8401 }
8402 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
8403
8404 /**
8405  *      nft_parse_register - parse a register value from a netlink attribute
8406  *
8407  *      @attr: netlink attribute
8408  *
8409  *      Parse and translate a register value from a netlink attribute.
8410  *      Registers used to be 128 bit wide, these register numbers will be
8411  *      mapped to the corresponding 32 bit register numbers.
8412  */
8413 unsigned int nft_parse_register(const struct nlattr *attr)
8414 {
8415         unsigned int reg;
8416
8417         reg = ntohl(nla_get_be32(attr));
8418         switch (reg) {
8419         case NFT_REG_VERDICT...NFT_REG_4:
8420                 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
8421         default:
8422                 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
8423         }
8424 }
8425 EXPORT_SYMBOL_GPL(nft_parse_register);
8426
8427 /**
8428  *      nft_dump_register - dump a register value to a netlink attribute
8429  *
8430  *      @skb: socket buffer
8431  *      @attr: attribute number
8432  *      @reg: register number
8433  *
8434  *      Construct a netlink attribute containing the register number. For
8435  *      compatibility reasons, register numbers being a multiple of 4 are
8436  *      translated to the corresponding 128 bit register numbers.
8437  */
8438 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
8439 {
8440         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
8441                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
8442         else
8443                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
8444
8445         return nla_put_be32(skb, attr, htonl(reg));
8446 }
8447 EXPORT_SYMBOL_GPL(nft_dump_register);
8448
8449 /**
8450  *      nft_validate_register_load - validate a load from a register
8451  *
8452  *      @reg: the register number
8453  *      @len: the length of the data
8454  *
8455  *      Validate that the input register is one of the general purpose
8456  *      registers and that the length of the load is within the bounds.
8457  */
8458 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
8459 {
8460         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8461                 return -EINVAL;
8462         if (len == 0)
8463                 return -EINVAL;
8464         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
8465                 return -ERANGE;
8466
8467         return 0;
8468 }
8469 EXPORT_SYMBOL_GPL(nft_validate_register_load);
8470
8471 /**
8472  *      nft_validate_register_store - validate an expressions' register store
8473  *
8474  *      @ctx: context of the expression performing the load
8475  *      @reg: the destination register number
8476  *      @data: the data to load
8477  *      @type: the data type
8478  *      @len: the length of the data
8479  *
8480  *      Validate that a data load uses the appropriate data type for
8481  *      the destination register and the length is within the bounds.
8482  *      A value of NULL for the data means that its runtime gathered
8483  *      data.
8484  */
8485 int nft_validate_register_store(const struct nft_ctx *ctx,
8486                                 enum nft_registers reg,
8487                                 const struct nft_data *data,
8488                                 enum nft_data_types type, unsigned int len)
8489 {
8490         int err;
8491
8492         switch (reg) {
8493         case NFT_REG_VERDICT:
8494                 if (type != NFT_DATA_VERDICT)
8495                         return -EINVAL;
8496
8497                 if (data != NULL &&
8498                     (data->verdict.code == NFT_GOTO ||
8499                      data->verdict.code == NFT_JUMP)) {
8500                         err = nf_tables_check_loops(ctx, data->verdict.chain);
8501                         if (err < 0)
8502                                 return err;
8503                 }
8504
8505                 return 0;
8506         default:
8507                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8508                         return -EINVAL;
8509                 if (len == 0)
8510                         return -EINVAL;
8511                 if (reg * NFT_REG32_SIZE + len >
8512                     sizeof_field(struct nft_regs, data))
8513                         return -ERANGE;
8514
8515                 if (data != NULL && type != NFT_DATA_VALUE)
8516                         return -EINVAL;
8517                 return 0;
8518         }
8519 }
8520 EXPORT_SYMBOL_GPL(nft_validate_register_store);
8521
8522 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
8523         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
8524         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
8525                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
8526         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
8527 };
8528
8529 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
8530                             struct nft_data_desc *desc, const struct nlattr *nla)
8531 {
8532         u8 genmask = nft_genmask_next(ctx->net);
8533         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
8534         struct nft_chain *chain;
8535         int err;
8536
8537         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
8538                                           nft_verdict_policy, NULL);
8539         if (err < 0)
8540                 return err;
8541
8542         if (!tb[NFTA_VERDICT_CODE])
8543                 return -EINVAL;
8544         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
8545
8546         switch (data->verdict.code) {
8547         default:
8548                 switch (data->verdict.code & NF_VERDICT_MASK) {
8549                 case NF_ACCEPT:
8550                 case NF_DROP:
8551                 case NF_QUEUE:
8552                         break;
8553                 default:
8554                         return -EINVAL;
8555                 }
8556                 fallthrough;
8557         case NFT_CONTINUE:
8558         case NFT_BREAK:
8559         case NFT_RETURN:
8560                 break;
8561         case NFT_JUMP:
8562         case NFT_GOTO:
8563                 if (tb[NFTA_VERDICT_CHAIN]) {
8564                         chain = nft_chain_lookup(ctx->net, ctx->table,
8565                                                  tb[NFTA_VERDICT_CHAIN],
8566                                                  genmask);
8567                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
8568                         chain = nft_chain_lookup_byid(ctx->net,
8569                                                       tb[NFTA_VERDICT_CHAIN_ID]);
8570                         if (IS_ERR(chain))
8571                                 return PTR_ERR(chain);
8572                 } else {
8573                         return -EINVAL;
8574                 }
8575
8576                 if (IS_ERR(chain))
8577                         return PTR_ERR(chain);
8578                 if (nft_is_base_chain(chain))
8579                         return -EOPNOTSUPP;
8580
8581                 chain->use++;
8582                 data->verdict.chain = chain;
8583                 break;
8584         }
8585
8586         desc->len = sizeof(data->verdict);
8587         desc->type = NFT_DATA_VERDICT;
8588         return 0;
8589 }
8590
8591 static void nft_verdict_uninit(const struct nft_data *data)
8592 {
8593         struct nft_chain *chain;
8594         struct nft_rule *rule;
8595
8596         switch (data->verdict.code) {
8597         case NFT_JUMP:
8598         case NFT_GOTO:
8599                 chain = data->verdict.chain;
8600                 chain->use--;
8601
8602                 if (!nft_chain_is_bound(chain))
8603                         break;
8604
8605                 chain->table->use--;
8606                 list_for_each_entry(rule, &chain->rules, list)
8607                         chain->use--;
8608
8609                 nft_chain_del(chain);
8610                 break;
8611         }
8612 }
8613
8614 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
8615 {
8616         struct nlattr *nest;
8617
8618         nest = nla_nest_start_noflag(skb, type);
8619         if (!nest)
8620                 goto nla_put_failure;
8621
8622         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
8623                 goto nla_put_failure;
8624
8625         switch (v->code) {
8626         case NFT_JUMP:
8627         case NFT_GOTO:
8628                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
8629                                    v->chain->name))
8630                         goto nla_put_failure;
8631         }
8632         nla_nest_end(skb, nest);
8633         return 0;
8634
8635 nla_put_failure:
8636         return -1;
8637 }
8638
8639 static int nft_value_init(const struct nft_ctx *ctx,
8640                           struct nft_data *data, unsigned int size,
8641                           struct nft_data_desc *desc, const struct nlattr *nla)
8642 {
8643         unsigned int len;
8644
8645         len = nla_len(nla);
8646         if (len == 0)
8647                 return -EINVAL;
8648         if (len > size)
8649                 return -EOVERFLOW;
8650
8651         nla_memcpy(data->data, nla, len);
8652         desc->type = NFT_DATA_VALUE;
8653         desc->len  = len;
8654         return 0;
8655 }
8656
8657 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
8658                           unsigned int len)
8659 {
8660         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
8661 }
8662
8663 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
8664         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
8665         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
8666 };
8667
8668 /**
8669  *      nft_data_init - parse nf_tables data netlink attributes
8670  *
8671  *      @ctx: context of the expression using the data
8672  *      @data: destination struct nft_data
8673  *      @size: maximum data length
8674  *      @desc: data description
8675  *      @nla: netlink attribute containing data
8676  *
8677  *      Parse the netlink data attributes and initialize a struct nft_data.
8678  *      The type and length of data are returned in the data description.
8679  *
8680  *      The caller can indicate that it only wants to accept data of type
8681  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
8682  */
8683 int nft_data_init(const struct nft_ctx *ctx,
8684                   struct nft_data *data, unsigned int size,
8685                   struct nft_data_desc *desc, const struct nlattr *nla)
8686 {
8687         struct nlattr *tb[NFTA_DATA_MAX + 1];
8688         int err;
8689
8690         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
8691                                           nft_data_policy, NULL);
8692         if (err < 0)
8693                 return err;
8694
8695         if (tb[NFTA_DATA_VALUE])
8696                 return nft_value_init(ctx, data, size, desc,
8697                                       tb[NFTA_DATA_VALUE]);
8698         if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
8699                 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
8700         return -EINVAL;
8701 }
8702 EXPORT_SYMBOL_GPL(nft_data_init);
8703
8704 /**
8705  *      nft_data_release - release a nft_data item
8706  *
8707  *      @data: struct nft_data to release
8708  *      @type: type of data
8709  *
8710  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
8711  *      all others need to be released by calling this function.
8712  */
8713 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
8714 {
8715         if (type < NFT_DATA_VERDICT)
8716                 return;
8717         switch (type) {
8718         case NFT_DATA_VERDICT:
8719                 return nft_verdict_uninit(data);
8720         default:
8721                 WARN_ON(1);
8722         }
8723 }
8724 EXPORT_SYMBOL_GPL(nft_data_release);
8725
8726 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
8727                   enum nft_data_types type, unsigned int len)
8728 {
8729         struct nlattr *nest;
8730         int err;
8731
8732         nest = nla_nest_start_noflag(skb, attr);
8733         if (nest == NULL)
8734                 return -1;
8735
8736         switch (type) {
8737         case NFT_DATA_VALUE:
8738                 err = nft_value_dump(skb, data, len);
8739                 break;
8740         case NFT_DATA_VERDICT:
8741                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
8742                 break;
8743         default:
8744                 err = -EINVAL;
8745                 WARN_ON(1);
8746         }
8747
8748         nla_nest_end(skb, nest);
8749         return err;
8750 }
8751 EXPORT_SYMBOL_GPL(nft_data_dump);
8752
8753 int __nft_release_basechain(struct nft_ctx *ctx)
8754 {
8755         struct nft_rule *rule, *nr;
8756
8757         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
8758                 return 0;
8759
8760         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
8761         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
8762                 list_del(&rule->list);
8763                 ctx->chain->use--;
8764                 nf_tables_rule_release(ctx, rule);
8765         }
8766         nft_chain_del(ctx->chain);
8767         ctx->table->use--;
8768         nf_tables_chain_destroy(ctx);
8769
8770         return 0;
8771 }
8772 EXPORT_SYMBOL_GPL(__nft_release_basechain);
8773
8774 static void __nft_release_tables(struct net *net)
8775 {
8776         struct nft_flowtable *flowtable, *nf;
8777         struct nft_table *table, *nt;
8778         struct nft_chain *chain, *nc;
8779         struct nft_object *obj, *ne;
8780         struct nft_rule *rule, *nr;
8781         struct nft_set *set, *ns;
8782         struct nft_ctx ctx = {
8783                 .net    = net,
8784                 .family = NFPROTO_NETDEV,
8785         };
8786
8787         list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
8788                 ctx.family = table->family;
8789
8790                 list_for_each_entry(chain, &table->chains, list)
8791                         nf_tables_unregister_hook(net, table, chain);
8792                 /* No packets are walking on these chains anymore. */
8793                 ctx.table = table;
8794                 list_for_each_entry(chain, &table->chains, list) {
8795                         ctx.chain = chain;
8796                         list_for_each_entry_safe(rule, nr, &chain->rules, list) {
8797                                 list_del(&rule->list);
8798                                 chain->use--;
8799                                 nf_tables_rule_release(&ctx, rule);
8800                         }
8801                 }
8802                 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
8803                         list_del(&flowtable->list);
8804                         table->use--;
8805                         nf_tables_flowtable_destroy(flowtable);
8806                 }
8807                 list_for_each_entry_safe(set, ns, &table->sets, list) {
8808                         list_del(&set->list);
8809                         table->use--;
8810                         nft_set_destroy(&ctx, set);
8811                 }
8812                 list_for_each_entry_safe(obj, ne, &table->objects, list) {
8813                         nft_obj_del(obj);
8814                         table->use--;
8815                         nft_obj_destroy(&ctx, obj);
8816                 }
8817                 list_for_each_entry_safe(chain, nc, &table->chains, list) {
8818                         ctx.chain = chain;
8819                         nft_chain_del(chain);
8820                         table->use--;
8821                         nf_tables_chain_destroy(&ctx);
8822                 }
8823                 list_del(&table->list);
8824                 nf_tables_table_destroy(&ctx);
8825         }
8826 }
8827
8828 static int __net_init nf_tables_init_net(struct net *net)
8829 {
8830         INIT_LIST_HEAD(&net->nft.tables);
8831         INIT_LIST_HEAD(&net->nft.commit_list);
8832         INIT_LIST_HEAD(&net->nft.module_list);
8833         INIT_LIST_HEAD(&net->nft.notify_list);
8834         mutex_init(&net->nft.commit_mutex);
8835         net->nft.base_seq = 1;
8836         net->nft.validate_state = NFT_VALIDATE_SKIP;
8837
8838         return 0;
8839 }
8840
8841 static void __net_exit nf_tables_exit_net(struct net *net)
8842 {
8843         mutex_lock(&net->nft.commit_mutex);
8844         if (!list_empty(&net->nft.commit_list))
8845                 __nf_tables_abort(net, NFNL_ABORT_NONE);
8846         __nft_release_tables(net);
8847         mutex_unlock(&net->nft.commit_mutex);
8848         WARN_ON_ONCE(!list_empty(&net->nft.tables));
8849         WARN_ON_ONCE(!list_empty(&net->nft.module_list));
8850         WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
8851 }
8852
8853 static struct pernet_operations nf_tables_net_ops = {
8854         .init   = nf_tables_init_net,
8855         .exit   = nf_tables_exit_net,
8856 };
8857
8858 static int __init nf_tables_module_init(void)
8859 {
8860         int err;
8861
8862         spin_lock_init(&nf_tables_destroy_list_lock);
8863         err = register_pernet_subsys(&nf_tables_net_ops);
8864         if (err < 0)
8865                 return err;
8866
8867         err = nft_chain_filter_init();
8868         if (err < 0)
8869                 goto err1;
8870
8871         err = nf_tables_core_module_init();
8872         if (err < 0)
8873                 goto err2;
8874
8875         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
8876         if (err < 0)
8877                 goto err3;
8878
8879         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
8880         if (err < 0)
8881                 goto err4;
8882
8883         err = nft_offload_init();
8884         if (err < 0)
8885                 goto err5;
8886
8887         /* must be last */
8888         err = nfnetlink_subsys_register(&nf_tables_subsys);
8889         if (err < 0)
8890                 goto err6;
8891
8892         nft_chain_route_init();
8893
8894         return err;
8895 err6:
8896         nft_offload_exit();
8897 err5:
8898         rhltable_destroy(&nft_objname_ht);
8899 err4:
8900         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
8901 err3:
8902         nf_tables_core_module_exit();
8903 err2:
8904         nft_chain_filter_fini();
8905 err1:
8906         unregister_pernet_subsys(&nf_tables_net_ops);
8907         return err;
8908 }
8909
8910 static void __exit nf_tables_module_exit(void)
8911 {
8912         nfnetlink_subsys_unregister(&nf_tables_subsys);
8913         nft_offload_exit();
8914         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
8915         nft_chain_filter_fini();
8916         nft_chain_route_fini();
8917         unregister_pernet_subsys(&nf_tables_net_ops);
8918         cancel_work_sync(&trans_destroy_work);
8919         rcu_barrier();
8920         rhltable_destroy(&nft_objname_ht);
8921         nf_tables_core_module_exit();
8922 }
8923
8924 module_init(nf_tables_module_init);
8925 module_exit(nf_tables_module_exit);
8926
8927 MODULE_LICENSE("GPL");
8928 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
8929 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);