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 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 585                                              ...)
 586 {
 587         char module_name[MODULE_NAME_LEN];
 588         struct nft_module_request *req;
 589         va_list args;
 590         int ret;
 591
 592         va_start(args, fmt);
 593         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 594         va_end(args);
 595         if (ret >= MODULE_NAME_LEN)
 596                 return 0;
 597
 598         list_for_each_entry(req, &net->nft.module_list, list) {
 599                 if (!strcmp(req->module, module_name)) {
 600                         if (req->done)
 601                                 return 0;
 602
 603                         /* A request to load this module already exists. */
 604                         return -EAGAIN;
 605                 }
 606         }
 607
 608         req = kmalloc(sizeof(*req), GFP_KERNEL);
 609         if (!req)
 610                 return -ENOMEM;
 611
 612         req->done = false;
 613         strlcpy(req->module, module_name, MODULE_NAME_LEN);
 614         list_add_tail(&req->list, &net->nft.module_list);
 615
 616         return -EAGAIN;
 617 }
 618 #endif
 619
 620 static void lockdep_nfnl_nft_mutex_not_held(void)
 621 {
 622 #ifdef CONFIG_PROVE_LOCKING
 623         if (debug_locks)
 624                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 625 #endif
 626 }
 627
 628 static const struct nft_chain_type *
 629 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 630                             u8 family, bool autoload)
 631 {
 632         const struct nft_chain_type *type;
 633
 634         type = __nf_tables_chain_type_lookup(nla, family);
 635         if (type != NULL)
 636                 return type;
 637
 638         lockdep_nfnl_nft_mutex_not_held();
 639 #ifdef CONFIG_MODULES
 640         if (autoload) {
 641                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 642                                        nla_len(nla),
 643                                        (const char *)nla_data(nla)) == -EAGAIN)
 644                         return ERR_PTR(-EAGAIN);
 645         }
 646 #endif
 647         return ERR_PTR(-ENOENT);
 648 }
 649
 650 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 651         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 652                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 653         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 654         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 655         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 656                                     .len = NFT_USERDATA_MAXLEN }
 657 };
 658
 659 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 660                                      u32 portid, u32 seq, int event, u32 flags,
 661                                      int family, const struct nft_table *table)
 662 {
 663         struct nlmsghdr *nlh;
 664         struct nfgenmsg *nfmsg;
 665
 666         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 667         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
 668         if (nlh == NULL)
 669                 goto nla_put_failure;
 670
 671         nfmsg = nlmsg_data(nlh);
 672         nfmsg->nfgen_family     = family;
 673         nfmsg->version          = NFNETLINK_V0;
 674         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
 675
 676         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 677             nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
 678             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 679             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 680                          NFTA_TABLE_PAD))
 681                 goto nla_put_failure;
 682
 683         if (table->udata) {
 684                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 685                         goto nla_put_failure;
 686         }
 687
 688         nlmsg_end(skb, nlh);
 689         return 0;
 690
 691 nla_put_failure:
 692         nlmsg_trim(skb, nlh);
 693         return -1;
 694 }
 695
 696 struct nftnl_skb_parms {
 697         bool report;
 698 };
 699 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 700
 701 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 702                                struct list_head *notify_list)
 703 {
 704         NFT_CB(skb).report = report;
 705         list_add_tail(&skb->list, notify_list);
 706 }
 707
 708 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 709 {
 710         struct sk_buff *skb;
 711         int err;
 712         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;?:0",
 713                               ctx->table->name, ctx->table->handle);
 714
 715         audit_log_nfcfg(buf,
 716                         ctx->family,
 717                         ctx->table->use,
 718                         event == NFT_MSG_NEWTABLE ?
 719                                 AUDIT_NFT_OP_TABLE_REGISTER :
 720                                 AUDIT_NFT_OP_TABLE_UNREGISTER,
 721                         GFP_KERNEL);
 722         kfree(buf);
 723
 724         if (!ctx->report &&
 725             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 726                 return;
 727
 728         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 729         if (skb == NULL)
 730                 goto err;
 731
 732         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 733                                         event, 0, ctx->family, ctx->table);
 734         if (err < 0) {
 735                 kfree_skb(skb);
 736                 goto err;
 737         }
 738
 739         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
 740         return;
 741 err:
 742         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 743 }
 744
 745 static int nf_tables_dump_tables(struct sk_buff *skb,
 746                                  struct netlink_callback *cb)
 747 {
 748         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 749         const struct nft_table *table;
 750         unsigned int idx = 0, s_idx = cb->args[0];
 751         struct net *net = sock_net(skb->sk);
 752         int family = nfmsg->nfgen_family;
 753
 754         rcu_read_lock();
 755         cb->seq = net->nft.base_seq;
 756
 757         list_for_each_entry_rcu(table, &net->nft.tables, list) {
 758                 if (family != NFPROTO_UNSPEC && family != table->family)
 759                         continue;
 760
 761                 if (idx < s_idx)
 762                         goto cont;
 763                 if (idx > s_idx)
 764                         memset(&cb->args[1], 0,
 765                                sizeof(cb->args) - sizeof(cb->args[0]));
 766                 if (!nft_is_active(net, table))
 767                         continue;
 768                 if (nf_tables_fill_table_info(skb, net,
 769                                               NETLINK_CB(cb->skb).portid,
 770                                               cb->nlh->nlmsg_seq,
 771                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 772                                               table->family, table) < 0)
 773                         goto done;
 774
 775                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 776 cont:
 777                 idx++;
 778         }
 779 done:
 780         rcu_read_unlock();
 781         cb->args[0] = idx;
 782         return skb->len;
 783 }
 784
 785 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 786                                       const struct nlmsghdr *nlh,
 787                                       struct netlink_dump_control *c)
 788 {
 789         int err;
 790
 791         if (!try_module_get(THIS_MODULE))
 792                 return -EINVAL;
 793
 794         rcu_read_unlock();
 795         err = netlink_dump_start(nlsk, skb, nlh, c);
 796         rcu_read_lock();
 797         module_put(THIS_MODULE);
 798
 799         return err;
 800 }
 801
 802 /* called with rcu_read_lock held */
 803 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
 804                               struct sk_buff *skb, const struct nlmsghdr *nlh,
 805                               const struct nlattr * const nla[],
 806                               struct netlink_ext_ack *extack)
 807 {
 808         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 809         u8 genmask = nft_genmask_cur(net);
 810         const struct nft_table *table;
 811         struct sk_buff *skb2;
 812         int family = nfmsg->nfgen_family;
 813         int err;
 814
 815         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 816                 struct netlink_dump_control c = {
 817                         .dump = nf_tables_dump_tables,
 818                         .module = THIS_MODULE,
 819                 };
 820
 821                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
 822         }
 823
 824         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
 825         if (IS_ERR(table)) {
 826                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 827                 return PTR_ERR(table);
 828         }
 829
 830         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 831         if (!skb2)
 832                 return -ENOMEM;
 833
 834         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 835                                         nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
 836                                         family, table);
 837         if (err < 0)
 838                 goto err_fill_table_info;
 839
 840         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 841
 842 err_fill_table_info:
 843         kfree_skb(skb2);
 844         return err;
 845 }
 846
 847 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
 848 {
 849         struct nft_chain *chain;
 850         u32 i = 0;
 851
 852         list_for_each_entry(chain, &table->chains, list) {
 853                 if (!nft_is_active_next(net, chain))
 854                         continue;
 855                 if (!nft_is_base_chain(chain))
 856                         continue;
 857
 858                 if (cnt && i++ == cnt)
 859                         break;
 860
 861                 nf_tables_unregister_hook(net, table, chain);
 862         }
 863 }
 864
 865 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
 866 {
 867         struct nft_chain *chain;
 868         int err, i = 0;
 869
 870         list_for_each_entry(chain, &table->chains, list) {
 871                 if (!nft_is_active_next(net, chain))
 872                         continue;
 873                 if (!nft_is_base_chain(chain))
 874                         continue;
 875
 876                 err = nf_tables_register_hook(net, table, chain);
 877                 if (err < 0)
 878                         goto err_register_hooks;
 879
 880                 i++;
 881         }
 882         return 0;
 883
 884 err_register_hooks:
 885         if (i)
 886                 nft_table_disable(net, table, i);
 887         return err;
 888 }
 889
 890 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
 891 {
 892         nft_table_disable(net, table, 0);
 893 }
 894
 895 static int nf_tables_updtable(struct nft_ctx *ctx)
 896 {
 897         struct nft_trans *trans;
 898         u32 flags;
 899         int ret = 0;
 900
 901         if (!ctx->nla[NFTA_TABLE_FLAGS])
 902                 return 0;
 903
 904         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
 905         if (flags & ~NFT_TABLE_F_DORMANT)
 906                 return -EINVAL;
 907
 908         if (flags == ctx->table->flags)
 909                 return 0;
 910
 911         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
 912                                 sizeof(struct nft_trans_table));
 913         if (trans == NULL)
 914                 return -ENOMEM;
 915
 916         if ((flags & NFT_TABLE_F_DORMANT) &&
 917             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
 918                 nft_trans_table_enable(trans) = false;
 919         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
 920                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
 921                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
 922                 ret = nf_tables_table_enable(ctx->net, ctx->table);
 923                 if (ret >= 0)
 924                         nft_trans_table_enable(trans) = true;
 925                 else
 926                         ctx->table->flags |= NFT_TABLE_F_DORMANT;
 927         }
 928         if (ret < 0)
 929                 goto err;
 930
 931         nft_trans_table_update(trans) = true;
 932         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 933         return 0;
 934 err:
 935         nft_trans_destroy(trans);
 936         return ret;
 937 }
 938
 939 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
 940 {
 941         const char *name = data;
 942
 943         return jhash(name, strlen(name), seed);
 944 }
 945
 946 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
 947 {
 948         const struct nft_chain *chain = data;
 949
 950         return nft_chain_hash(chain->name, 0, seed);
 951 }
 952
 953 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
 954                               const void *ptr)
 955 {
 956         const struct nft_chain *chain = ptr;
 957         const char *name = arg->key;
 958
 959         return strcmp(chain->name, name);
 960 }
 961
 962 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
 963 {
 964         const struct nft_object_hash_key *k = data;
 965
 966         seed ^= hash_ptr(k->table, 32);
 967
 968         return jhash(k->name, strlen(k->name), seed);
 969 }
 970
 971 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
 972 {
 973         const struct nft_object *obj = data;
 974
 975         return nft_objname_hash(&obj->key, 0, seed);
 976 }
 977
 978 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
 979                                 const void *ptr)
 980 {
 981         const struct nft_object_hash_key *k = arg->key;
 982         const struct nft_object *obj = ptr;
 983
 984         if (obj->key.table != k->table)
 985                 return -1;
 986
 987         return strcmp(obj->key.name, k->name);
 988 }
 989
 990 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
 991                               struct sk_buff *skb, const struct nlmsghdr *nlh,
 992                               const struct nlattr * const nla[],
 993                               struct netlink_ext_ack *extack)
 994 {
 995         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 996         u8 genmask = nft_genmask_next(net);
 997         int family = nfmsg->nfgen_family;
 998         const struct nlattr *attr;
 999         struct nft_table *table;
1000         struct nft_ctx ctx;
1001         u32 flags = 0;
1002         int err;
1003
1004         lockdep_assert_held(&net->nft.commit_mutex);
1005         attr = nla[NFTA_TABLE_NAME];
1006         table = nft_table_lookup(net, attr, family, genmask);
1007         if (IS_ERR(table)) {
1008                 if (PTR_ERR(table) != -ENOENT)
1009                         return PTR_ERR(table);
1010         } else {
1011                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1012                         NL_SET_BAD_ATTR(extack, attr);
1013                         return -EEXIST;
1014                 }
1015                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1016                         return -EOPNOTSUPP;
1017
1018                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1019                 return nf_tables_updtable(&ctx);
1020         }
1021
1022         if (nla[NFTA_TABLE_FLAGS]) {
1023                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1024                 if (flags & ~NFT_TABLE_F_DORMANT)
1025                         return -EINVAL;
1026         }
1027
1028         err = -ENOMEM;
1029         table = kzalloc(sizeof(*table), GFP_KERNEL);
1030         if (table == NULL)
1031                 goto err_kzalloc;
1032
1033         table->name = nla_strdup(attr, GFP_KERNEL);
1034         if (table->name == NULL)
1035                 goto err_strdup;
1036
1037         if (nla[NFTA_TABLE_USERDATA]) {
1038                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL);
1039                 if (table->udata == NULL)
1040                         goto err_table_udata;
1041
1042                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1043         }
1044
1045         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1046         if (err)
1047                 goto err_chain_ht;
1048
1049         INIT_LIST_HEAD(&table->chains);
1050         INIT_LIST_HEAD(&table->sets);
1051         INIT_LIST_HEAD(&table->objects);
1052         INIT_LIST_HEAD(&table->flowtables);
1053         table->family = family;
1054         table->flags = flags;
1055         table->handle = ++table_handle;
1056
1057         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1058         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1059         if (err < 0)
1060                 goto err_trans;
1061
1062         list_add_tail_rcu(&table->list, &net->nft.tables);
1063         return 0;
1064 err_trans:
1065         rhltable_destroy(&table->chains_ht);
1066 err_chain_ht:
1067         kfree(table->udata);
1068 err_table_udata:
1069         kfree(table->name);
1070 err_strdup:
1071         kfree(table);
1072 err_kzalloc:
1073         return err;
1074 }
1075
1076 static int nft_flush_table(struct nft_ctx *ctx)
1077 {
1078         struct nft_flowtable *flowtable, *nft;
1079         struct nft_chain *chain, *nc;
1080         struct nft_object *obj, *ne;
1081         struct nft_set *set, *ns;
1082         int err;
1083
1084         list_for_each_entry(chain, &ctx->table->chains, list) {
1085                 if (!nft_is_active_next(ctx->net, chain))
1086                         continue;
1087
1088                 if (nft_chain_is_bound(chain))
1089                         continue;
1090
1091                 ctx->chain = chain;
1092
1093                 err = nft_delrule_by_chain(ctx);
1094                 if (err < 0)
1095                         goto out;
1096         }
1097
1098         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1099                 if (!nft_is_active_next(ctx->net, set))
1100                         continue;
1101
1102                 if (nft_set_is_anonymous(set) &&
1103                     !list_empty(&set->bindings))
1104                         continue;
1105
1106                 err = nft_delset(ctx, set);
1107                 if (err < 0)
1108                         goto out;
1109         }
1110
1111         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1112                 if (!nft_is_active_next(ctx->net, flowtable))
1113                         continue;
1114
1115                 err = nft_delflowtable(ctx, flowtable);
1116                 if (err < 0)
1117                         goto out;
1118         }
1119
1120         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1121                 if (!nft_is_active_next(ctx->net, obj))
1122                         continue;
1123
1124                 err = nft_delobj(ctx, obj);
1125                 if (err < 0)
1126                         goto out;
1127         }
1128
1129         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1130                 if (!nft_is_active_next(ctx->net, chain))
1131                         continue;
1132
1133                 if (nft_chain_is_bound(chain))
1134                         continue;
1135
1136                 ctx->chain = chain;
1137
1138                 err = nft_delchain(ctx);
1139                 if (err < 0)
1140                         goto out;
1141         }
1142
1143         err = nft_deltable(ctx);
1144 out:
1145         return err;
1146 }
1147
1148 static int nft_flush(struct nft_ctx *ctx, int family)
1149 {
1150         struct nft_table *table, *nt;
1151         const struct nlattr * const *nla = ctx->nla;
1152         int err = 0;
1153
1154         list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
1155                 if (family != AF_UNSPEC && table->family != family)
1156                         continue;
1157
1158                 ctx->family = table->family;
1159
1160                 if (!nft_is_active_next(ctx->net, table))
1161                         continue;
1162
1163                 if (nla[NFTA_TABLE_NAME] &&
1164                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1165                         continue;
1166
1167                 ctx->table = table;
1168
1169                 err = nft_flush_table(ctx);
1170                 if (err < 0)
1171                         goto out;
1172         }
1173 out:
1174         return err;
1175 }
1176
1177 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1178                               struct sk_buff *skb, const struct nlmsghdr *nlh,
1179                               const struct nlattr * const nla[],
1180                               struct netlink_ext_ack *extack)
1181 {
1182         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1183         u8 genmask = nft_genmask_next(net);
1184         int family = nfmsg->nfgen_family;
1185         const struct nlattr *attr;
1186         struct nft_table *table;
1187         struct nft_ctx ctx;
1188
1189         nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
1190         if (family == AF_UNSPEC ||
1191             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1192                 return nft_flush(&ctx, family);
1193
1194         if (nla[NFTA_TABLE_HANDLE]) {
1195                 attr = nla[NFTA_TABLE_HANDLE];
1196                 table = nft_table_lookup_byhandle(net, attr, genmask);
1197         } else {
1198                 attr = nla[NFTA_TABLE_NAME];
1199                 table = nft_table_lookup(net, attr, family, genmask);
1200         }
1201
1202         if (IS_ERR(table)) {
1203                 NL_SET_BAD_ATTR(extack, attr);
1204                 return PTR_ERR(table);
1205         }
1206
1207         if (nlh->nlmsg_flags & NLM_F_NONREC &&
1208             table->use > 0)
1209                 return -EBUSY;
1210
1211         ctx.family = family;
1212         ctx.table = table;
1213
1214         return nft_flush_table(&ctx);
1215 }
1216
1217 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1218 {
1219         if (WARN_ON(ctx->table->use > 0))
1220                 return;
1221
1222         rhltable_destroy(&ctx->table->chains_ht);
1223         kfree(ctx->table->name);
1224         kfree(ctx->table->udata);
1225         kfree(ctx->table);
1226 }
1227
1228 void nft_register_chain_type(const struct nft_chain_type *ctype)
1229 {
1230         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1231         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1232                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1233                 return;
1234         }
1235         chain_type[ctype->family][ctype->type] = ctype;
1236         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1237 }
1238 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1239
1240 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1241 {
1242         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1243         chain_type[ctype->family][ctype->type] = NULL;
1244         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1245 }
1246 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1247
1248 /*
1249  * Chains
1250  */
1251
1252 static struct nft_chain *
1253 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1254 {
1255         struct nft_chain *chain;
1256
1257         list_for_each_entry(chain, &table->chains, list) {
1258                 if (chain->handle == handle &&
1259                     nft_active_genmask(chain, genmask))
1260                         return chain;
1261         }
1262
1263         return ERR_PTR(-ENOENT);
1264 }
1265
1266 static bool lockdep_commit_lock_is_held(const struct net *net)
1267 {
1268 #ifdef CONFIG_PROVE_LOCKING
1269         return lockdep_is_held(&net->nft.commit_mutex);
1270 #else
1271         return true;
1272 #endif
1273 }
1274
1275 static struct nft_chain *nft_chain_lookup(struct net *net,
1276                                           struct nft_table *table,
1277                                           const struct nlattr *nla, u8 genmask)
1278 {
1279         char search[NFT_CHAIN_MAXNAMELEN + 1];
1280         struct rhlist_head *tmp, *list;
1281         struct nft_chain *chain;
1282
1283         if (nla == NULL)
1284                 return ERR_PTR(-EINVAL);
1285
1286         nla_strscpy(search, nla, sizeof(search));
1287
1288         WARN_ON(!rcu_read_lock_held() &&
1289                 !lockdep_commit_lock_is_held(net));
1290
1291         chain = ERR_PTR(-ENOENT);
1292         rcu_read_lock();
1293         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1294         if (!list)
1295                 goto out_unlock;
1296
1297         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1298                 if (nft_active_genmask(chain, genmask))
1299                         goto out_unlock;
1300         }
1301         chain = ERR_PTR(-ENOENT);
1302 out_unlock:
1303         rcu_read_unlock();
1304         return chain;
1305 }
1306
1307 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1308         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1309                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1310         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1311         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1312                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1313         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1314         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1315         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1316                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1317         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1318         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1319         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1320         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1321                                     .len = NFT_USERDATA_MAXLEN },
1322 };
1323
1324 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1325         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1326         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1327         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1328                                     .len = IFNAMSIZ - 1 },
1329 };
1330
1331 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1332 {
1333         struct nft_stats *cpu_stats, total;
1334         struct nlattr *nest;
1335         unsigned int seq;
1336         u64 pkts, bytes;
1337         int cpu;
1338
1339         if (!stats)
1340                 return 0;
1341
1342         memset(&total, 0, sizeof(total));
1343         for_each_possible_cpu(cpu) {
1344                 cpu_stats = per_cpu_ptr(stats, cpu);
1345                 do {
1346                         seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1347                         pkts = cpu_stats->pkts;
1348                         bytes = cpu_stats->bytes;
1349                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1350                 total.pkts += pkts;
1351                 total.bytes += bytes;
1352         }
1353         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1354         if (nest == NULL)
1355                 goto nla_put_failure;
1356
1357         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1358                          NFTA_COUNTER_PAD) ||
1359             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1360                          NFTA_COUNTER_PAD))
1361                 goto nla_put_failure;
1362
1363         nla_nest_end(skb, nest);
1364         return 0;
1365
1366 nla_put_failure:
1367         return -ENOSPC;
1368 }
1369
1370 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1371                                    const struct nft_base_chain *basechain)
1372 {
1373         const struct nf_hook_ops *ops = &basechain->ops;
1374         struct nft_hook *hook, *first = NULL;
1375         struct nlattr *nest, *nest_devs;
1376         int n = 0;
1377
1378         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1379         if (nest == NULL)
1380                 goto nla_put_failure;
1381         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1382                 goto nla_put_failure;
1383         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1384                 goto nla_put_failure;
1385
1386         if (nft_base_chain_netdev(family, ops->hooknum)) {
1387                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1388                 list_for_each_entry(hook, &basechain->hook_list, list) {
1389                         if (!first)
1390                                 first = hook;
1391
1392                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1393                                            hook->ops.dev->name))
1394                                 goto nla_put_failure;
1395                         n++;
1396                 }
1397                 nla_nest_end(skb, nest_devs);
1398
1399                 if (n == 1 &&
1400                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1401                         goto nla_put_failure;
1402         }
1403         nla_nest_end(skb, nest);
1404
1405         return 0;
1406 nla_put_failure:
1407         return -1;
1408 }
1409
1410 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1411                                      u32 portid, u32 seq, int event, u32 flags,
1412                                      int family, const struct nft_table *table,
1413                                      const struct nft_chain *chain)
1414 {
1415         struct nlmsghdr *nlh;
1416         struct nfgenmsg *nfmsg;
1417
1418         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1419         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1420         if (nlh == NULL)
1421                 goto nla_put_failure;
1422
1423         nfmsg = nlmsg_data(nlh);
1424         nfmsg->nfgen_family     = family;
1425         nfmsg->version          = NFNETLINK_V0;
1426         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
1427
1428         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1429                 goto nla_put_failure;
1430         if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1431                          NFTA_CHAIN_PAD))
1432                 goto nla_put_failure;
1433         if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1434                 goto nla_put_failure;
1435
1436         if (nft_is_base_chain(chain)) {
1437                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1438                 struct nft_stats __percpu *stats;
1439
1440                 if (nft_dump_basechain_hook(skb, family, basechain))
1441                         goto nla_put_failure;
1442
1443                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1444                                  htonl(basechain->policy)))
1445                         goto nla_put_failure;
1446
1447                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1448                         goto nla_put_failure;
1449
1450                 stats = rcu_dereference_check(basechain->stats,
1451                                               lockdep_commit_lock_is_held(net));
1452                 if (nft_dump_stats(skb, stats))
1453                         goto nla_put_failure;
1454         }
1455
1456         if (chain->flags &&
1457             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1458                 goto nla_put_failure;
1459
1460         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1461                 goto nla_put_failure;
1462
1463         if (chain->udata &&
1464             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1465                 goto nla_put_failure;
1466
1467         nlmsg_end(skb, nlh);
1468         return 0;
1469
1470 nla_put_failure:
1471         nlmsg_trim(skb, nlh);
1472         return -1;
1473 }
1474
1475 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1476 {
1477         struct sk_buff *skb;
1478         int err;
1479         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
1480                               ctx->table->name, ctx->table->handle,
1481                               ctx->chain->name, ctx->chain->handle);
1482
1483         audit_log_nfcfg(buf,
1484                         ctx->family,
1485                         ctx->chain->use,
1486                         event == NFT_MSG_NEWCHAIN ?
1487                                 AUDIT_NFT_OP_CHAIN_REGISTER :
1488                                 AUDIT_NFT_OP_CHAIN_UNREGISTER,
1489                         GFP_KERNEL);
1490         kfree(buf);
1491
1492         if (!ctx->report &&
1493             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1494                 return;
1495
1496         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1497         if (skb == NULL)
1498                 goto err;
1499
1500         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1501                                         event, 0, ctx->family, ctx->table,
1502                                         ctx->chain);
1503         if (err < 0) {
1504                 kfree_skb(skb);
1505                 goto err;
1506         }
1507
1508         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
1509         return;
1510 err:
1511         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1512 }
1513
1514 static int nf_tables_dump_chains(struct sk_buff *skb,
1515                                  struct netlink_callback *cb)
1516 {
1517         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1518         const struct nft_table *table;
1519         const struct nft_chain *chain;
1520         unsigned int idx = 0, s_idx = cb->args[0];
1521         struct net *net = sock_net(skb->sk);
1522         int family = nfmsg->nfgen_family;
1523
1524         rcu_read_lock();
1525         cb->seq = net->nft.base_seq;
1526
1527         list_for_each_entry_rcu(table, &net->nft.tables, list) {
1528                 if (family != NFPROTO_UNSPEC && family != table->family)
1529                         continue;
1530
1531                 list_for_each_entry_rcu(chain, &table->chains, list) {
1532                         if (idx < s_idx)
1533                                 goto cont;
1534                         if (idx > s_idx)
1535                                 memset(&cb->args[1], 0,
1536                                        sizeof(cb->args) - sizeof(cb->args[0]));
1537                         if (!nft_is_active(net, chain))
1538                                 continue;
1539                         if (nf_tables_fill_chain_info(skb, net,
1540                                                       NETLINK_CB(cb->skb).portid,
1541                                                       cb->nlh->nlmsg_seq,
1542                                                       NFT_MSG_NEWCHAIN,
1543                                                       NLM_F_MULTI,
1544                                                       table->family, table,
1545                                                       chain) < 0)
1546                                 goto done;
1547
1548                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1549 cont:
1550                         idx++;
1551                 }
1552         }
1553 done:
1554         rcu_read_unlock();
1555         cb->args[0] = idx;
1556         return skb->len;
1557 }
1558
1559 /* called with rcu_read_lock held */
1560 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1561                               struct sk_buff *skb, const struct nlmsghdr *nlh,
1562                               const struct nlattr * const nla[],
1563                               struct netlink_ext_ack *extack)
1564 {
1565         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1566         u8 genmask = nft_genmask_cur(net);
1567         const struct nft_chain *chain;
1568         struct nft_table *table;
1569         struct sk_buff *skb2;
1570         int family = nfmsg->nfgen_family;
1571         int err;
1572
1573         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1574                 struct netlink_dump_control c = {
1575                         .dump = nf_tables_dump_chains,
1576                         .module = THIS_MODULE,
1577                 };
1578
1579                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1580         }
1581
1582         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1583         if (IS_ERR(table)) {
1584                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1585                 return PTR_ERR(table);
1586         }
1587
1588         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1589         if (IS_ERR(chain)) {
1590                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1591                 return PTR_ERR(chain);
1592         }
1593
1594         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1595         if (!skb2)
1596                 return -ENOMEM;
1597
1598         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1599                                         nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1600                                         family, table, chain);
1601         if (err < 0)
1602                 goto err_fill_chain_info;
1603
1604         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1605
1606 err_fill_chain_info:
1607         kfree_skb(skb2);
1608         return err;
1609 }
1610
1611 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1612         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1613         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1614 };
1615
1616 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1617 {
1618         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1619         struct nft_stats __percpu *newstats;
1620         struct nft_stats *stats;
1621         int err;
1622
1623         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1624                                           nft_counter_policy, NULL);
1625         if (err < 0)
1626                 return ERR_PTR(err);
1627
1628         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1629                 return ERR_PTR(-EINVAL);
1630
1631         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1632         if (newstats == NULL)
1633                 return ERR_PTR(-ENOMEM);
1634
1635         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1636          * are not exposed to userspace.
1637          */
1638         preempt_disable();
1639         stats = this_cpu_ptr(newstats);
1640         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1641         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1642         preempt_enable();
1643
1644         return newstats;
1645 }
1646
1647 static void nft_chain_stats_replace(struct nft_trans *trans)
1648 {
1649         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1650
1651         if (!nft_trans_chain_stats(trans))
1652                 return;
1653
1654         nft_trans_chain_stats(trans) =
1655                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1656                                     lockdep_commit_lock_is_held(trans->ctx.net));
1657
1658         if (!nft_trans_chain_stats(trans))
1659                 static_branch_inc(&nft_counters_enabled);
1660 }
1661
1662 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1663 {
1664         struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1665         struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1666
1667         if (g0 != g1)
1668                 kvfree(g1);
1669         kvfree(g0);
1670
1671         /* should be NULL either via abort or via successful commit */
1672         WARN_ON_ONCE(chain->rules_next);
1673         kvfree(chain->rules_next);
1674 }
1675
1676 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1677 {
1678         struct nft_chain *chain = ctx->chain;
1679         struct nft_hook *hook, *next;
1680
1681         if (WARN_ON(chain->use > 0))
1682                 return;
1683
1684         /* no concurrent access possible anymore */
1685         nf_tables_chain_free_chain_rules(chain);
1686
1687         if (nft_is_base_chain(chain)) {
1688                 struct nft_base_chain *basechain = nft_base_chain(chain);
1689
1690                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1691                         list_for_each_entry_safe(hook, next,
1692                                                  &basechain->hook_list, list) {
1693                                 list_del_rcu(&hook->list);
1694                                 kfree_rcu(hook, rcu);
1695                         }
1696                 }
1697                 module_put(basechain->type->owner);
1698                 if (rcu_access_pointer(basechain->stats)) {
1699                         static_branch_dec(&nft_counters_enabled);
1700                         free_percpu(rcu_dereference_raw(basechain->stats));
1701                 }
1702                 kfree(chain->name);
1703                 kfree(chain->udata);
1704                 kfree(basechain);
1705         } else {
1706                 kfree(chain->name);
1707                 kfree(chain->udata);
1708                 kfree(chain);
1709         }
1710 }
1711
1712 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1713                                               const struct nlattr *attr)
1714 {
1715         struct net_device *dev;
1716         char ifname[IFNAMSIZ];
1717         struct nft_hook *hook;
1718         int err;
1719
1720         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1721         if (!hook) {
1722                 err = -ENOMEM;
1723                 goto err_hook_alloc;
1724         }
1725
1726         nla_strscpy(ifname, attr, IFNAMSIZ);
1727         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1728          * indirectly serializing all the other holders of the commit_mutex with
1729          * the rtnl_mutex.
1730          */
1731         dev = __dev_get_by_name(net, ifname);
1732         if (!dev) {
1733                 err = -ENOENT;
1734                 goto err_hook_dev;
1735         }
1736         hook->ops.dev = dev;
1737         hook->inactive = false;
1738
1739         return hook;
1740
1741 err_hook_dev:
1742         kfree(hook);
1743 err_hook_alloc:
1744         return ERR_PTR(err);
1745 }
1746
1747 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1748                                            const struct nft_hook *this)
1749 {
1750         struct nft_hook *hook;
1751
1752         list_for_each_entry(hook, hook_list, list) {
1753                 if (this->ops.dev == hook->ops.dev)
1754                         return hook;
1755         }
1756
1757         return NULL;
1758 }
1759
1760 static int nf_tables_parse_netdev_hooks(struct net *net,
1761                                         const struct nlattr *attr,
1762                                         struct list_head *hook_list)
1763 {
1764         struct nft_hook *hook, *next;
1765         const struct nlattr *tmp;
1766         int rem, n = 0, err;
1767
1768         nla_for_each_nested(tmp, attr, rem) {
1769                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1770                         err = -EINVAL;
1771                         goto err_hook;
1772                 }
1773
1774                 hook = nft_netdev_hook_alloc(net, tmp);
1775                 if (IS_ERR(hook)) {
1776                         err = PTR_ERR(hook);
1777                         goto err_hook;
1778                 }
1779                 if (nft_hook_list_find(hook_list, hook)) {
1780                         kfree(hook);
1781                         err = -EEXIST;
1782                         goto err_hook;
1783                 }
1784                 list_add_tail(&hook->list, hook_list);
1785                 n++;
1786
1787                 if (n == NFT_NETDEVICE_MAX) {
1788                         err = -EFBIG;
1789                         goto err_hook;
1790                 }
1791         }
1792
1793         return 0;
1794
1795 err_hook:
1796         list_for_each_entry_safe(hook, next, hook_list, list) {
1797                 list_del(&hook->list);
1798                 kfree(hook);
1799         }
1800         return err;
1801 }
1802
1803 struct nft_chain_hook {
1804         u32                             num;
1805         s32                             priority;
1806         const struct nft_chain_type     *type;
1807         struct list_head                list;
1808 };
1809
1810 static int nft_chain_parse_netdev(struct net *net,
1811                                   struct nlattr *tb[],
1812                                   struct list_head *hook_list)
1813 {
1814         struct nft_hook *hook;
1815         int err;
1816
1817         if (tb[NFTA_HOOK_DEV]) {
1818                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1819                 if (IS_ERR(hook))
1820                         return PTR_ERR(hook);
1821
1822                 list_add_tail(&hook->list, hook_list);
1823         } else if (tb[NFTA_HOOK_DEVS]) {
1824                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1825                                                    hook_list);
1826                 if (err < 0)
1827                         return err;
1828
1829                 if (list_empty(hook_list))
1830                         return -EINVAL;
1831         } else {
1832                 return -EINVAL;
1833         }
1834
1835         return 0;
1836 }
1837
1838 static int nft_chain_parse_hook(struct net *net,
1839                                 const struct nlattr * const nla[],
1840                                 struct nft_chain_hook *hook, u8 family,
1841                                 bool autoload)
1842 {
1843         struct nlattr *ha[NFTA_HOOK_MAX + 1];
1844         const struct nft_chain_type *type;
1845         int err;
1846
1847         lockdep_assert_held(&net->nft.commit_mutex);
1848         lockdep_nfnl_nft_mutex_not_held();
1849
1850         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1851                                           nla[NFTA_CHAIN_HOOK],
1852                                           nft_hook_policy, NULL);
1853         if (err < 0)
1854                 return err;
1855
1856         if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1857             ha[NFTA_HOOK_PRIORITY] == NULL)
1858                 return -EINVAL;
1859
1860         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1861         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1862
1863         type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1864         if (!type)
1865                 return -EOPNOTSUPP;
1866
1867         if (nla[NFTA_CHAIN_TYPE]) {
1868                 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1869                                                    family, autoload);
1870                 if (IS_ERR(type))
1871                         return PTR_ERR(type);
1872         }
1873         if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1874                 return -EOPNOTSUPP;
1875
1876         if (type->type == NFT_CHAIN_T_NAT &&
1877             hook->priority <= NF_IP_PRI_CONNTRACK)
1878                 return -EOPNOTSUPP;
1879
1880         if (!try_module_get(type->owner))
1881                 return -ENOENT;
1882
1883         hook->type = type;
1884
1885         INIT_LIST_HEAD(&hook->list);
1886         if (nft_base_chain_netdev(family, hook->num)) {
1887                 err = nft_chain_parse_netdev(net, ha, &hook->list);
1888                 if (err < 0) {
1889                         module_put(type->owner);
1890                         return err;
1891                 }
1892         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
1893                 module_put(type->owner);
1894                 return -EOPNOTSUPP;
1895         }
1896
1897         return 0;
1898 }
1899
1900 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1901 {
1902         struct nft_hook *h, *next;
1903
1904         list_for_each_entry_safe(h, next, &hook->list, list) {
1905                 list_del(&h->list);
1906                 kfree(h);
1907         }
1908         module_put(hook->type->owner);
1909 }
1910
1911 struct nft_rules_old {
1912         struct rcu_head h;
1913         struct nft_rule **start;
1914 };
1915
1916 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1917                                                      unsigned int alloc)
1918 {
1919         if (alloc > INT_MAX)
1920                 return NULL;
1921
1922         alloc += 1;     /* NULL, ends rules */
1923         if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1924                 return NULL;
1925
1926         alloc *= sizeof(struct nft_rule *);
1927         alloc += sizeof(struct nft_rules_old);
1928
1929         return kvmalloc(alloc, GFP_KERNEL);
1930 }
1931
1932 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
1933                                     const struct nft_chain_hook *hook,
1934                                     struct nft_chain *chain)
1935 {
1936         ops->pf         = family;
1937         ops->hooknum    = hook->num;
1938         ops->priority   = hook->priority;
1939         ops->priv       = chain;
1940         ops->hook       = hook->type->hooks[ops->hooknum];
1941 }
1942
1943 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
1944                               struct nft_chain_hook *hook, u32 flags)
1945 {
1946         struct nft_chain *chain;
1947         struct nft_hook *h;
1948
1949         basechain->type = hook->type;
1950         INIT_LIST_HEAD(&basechain->hook_list);
1951         chain = &basechain->chain;
1952
1953         if (nft_base_chain_netdev(family, hook->num)) {
1954                 list_splice_init(&hook->list, &basechain->hook_list);
1955                 list_for_each_entry(h, &basechain->hook_list, list)
1956                         nft_basechain_hook_init(&h->ops, family, hook, chain);
1957
1958                 basechain->ops.hooknum  = hook->num;
1959                 basechain->ops.priority = hook->priority;
1960         } else {
1961                 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
1962         }
1963
1964         chain->flags |= NFT_CHAIN_BASE | flags;
1965         basechain->policy = NF_ACCEPT;
1966         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
1967             nft_chain_offload_priority(basechain) < 0)
1968                 return -EOPNOTSUPP;
1969
1970         flow_block_init(&basechain->flow_block);
1971
1972         return 0;
1973 }
1974
1975 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
1976 {
1977         int err;
1978
1979         err = rhltable_insert_key(&table->chains_ht, chain->name,
1980                                   &chain->rhlhead, nft_chain_ht_params);
1981         if (err)
1982                 return err;
1983
1984         list_add_tail_rcu(&chain->list, &table->chains);
1985
1986         return 0;
1987 }
1988
1989 static u64 chain_id;
1990
1991 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1992                               u8 policy, u32 flags)
1993 {
1994         const struct nlattr * const *nla = ctx->nla;
1995         struct nft_table *table = ctx->table;
1996         struct nft_base_chain *basechain;
1997         struct nft_stats __percpu *stats;
1998         struct net *net = ctx->net;
1999         char name[NFT_NAME_MAXLEN];
2000         struct nft_trans *trans;
2001         struct nft_chain *chain;
2002         struct nft_rule **rules;
2003         int err;
2004
2005         if (table->use == UINT_MAX)
2006                 return -EOVERFLOW;
2007
2008         if (nla[NFTA_CHAIN_HOOK]) {
2009                 struct nft_chain_hook hook;
2010
2011                 if (flags & NFT_CHAIN_BINDING)
2012                         return -EOPNOTSUPP;
2013
2014                 err = nft_chain_parse_hook(net, nla, &hook, family, true);
2015                 if (err < 0)
2016                         return err;
2017
2018                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
2019                 if (basechain == NULL) {
2020                         nft_chain_release_hook(&hook);
2021                         return -ENOMEM;
2022                 }
2023                 chain = &basechain->chain;
2024
2025                 if (nla[NFTA_CHAIN_COUNTERS]) {
2026                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2027                         if (IS_ERR(stats)) {
2028                                 nft_chain_release_hook(&hook);
2029                                 kfree(basechain);
2030                                 return PTR_ERR(stats);
2031                         }
2032                         rcu_assign_pointer(basechain->stats, stats);
2033                         static_branch_inc(&nft_counters_enabled);
2034                 }
2035
2036                 err = nft_basechain_init(basechain, family, &hook, flags);
2037                 if (err < 0) {
2038                         nft_chain_release_hook(&hook);
2039                         kfree(basechain);
2040                         return err;
2041                 }
2042         } else {
2043                 if (flags & NFT_CHAIN_BASE)
2044                         return -EINVAL;
2045                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2046                         return -EOPNOTSUPP;
2047
2048                 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2049                 if (chain == NULL)
2050                         return -ENOMEM;
2051
2052                 chain->flags = flags;
2053         }
2054         ctx->chain = chain;
2055
2056         INIT_LIST_HEAD(&chain->rules);
2057         chain->handle = nf_tables_alloc_handle(table);
2058         chain->table = table;
2059
2060         if (nla[NFTA_CHAIN_NAME]) {
2061                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2062         } else {
2063                 if (!(flags & NFT_CHAIN_BINDING)) {
2064                         err = -EINVAL;
2065                         goto err_destroy_chain;
2066                 }
2067
2068                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2069                 chain->name = kstrdup(name, GFP_KERNEL);
2070         }
2071
2072         if (!chain->name) {
2073                 err = -ENOMEM;
2074                 goto err_destroy_chain;
2075         }
2076
2077         if (nla[NFTA_CHAIN_USERDATA]) {
2078                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL);
2079                 if (chain->udata == NULL) {
2080                         err = -ENOMEM;
2081                         goto err_destroy_chain;
2082                 }
2083                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2084         }
2085
2086         rules = nf_tables_chain_alloc_rules(chain, 0);
2087         if (!rules) {
2088                 err = -ENOMEM;
2089                 goto err_destroy_chain;
2090         }
2091
2092         *rules = NULL;
2093         rcu_assign_pointer(chain->rules_gen_0, rules);
2094         rcu_assign_pointer(chain->rules_gen_1, rules);
2095
2096         err = nf_tables_register_hook(net, table, chain);
2097         if (err < 0)
2098                 goto err_destroy_chain;
2099
2100         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2101         if (IS_ERR(trans)) {
2102                 err = PTR_ERR(trans);
2103                 goto err_unregister_hook;
2104         }
2105
2106         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2107         if (nft_is_base_chain(chain))
2108                 nft_trans_chain_policy(trans) = policy;
2109
2110         err = nft_chain_add(table, chain);
2111         if (err < 0) {
2112                 nft_trans_destroy(trans);
2113                 goto err_unregister_hook;
2114         }
2115
2116         table->use++;
2117
2118         return 0;
2119 err_unregister_hook:
2120         nf_tables_unregister_hook(net, table, chain);
2121 err_destroy_chain:
2122         nf_tables_chain_destroy(ctx);
2123
2124         return err;
2125 }
2126
2127 static bool nft_hook_list_equal(struct list_head *hook_list1,
2128                                 struct list_head *hook_list2)
2129 {
2130         struct nft_hook *hook;
2131         int n = 0, m = 0;
2132
2133         n = 0;
2134         list_for_each_entry(hook, hook_list2, list) {
2135                 if (!nft_hook_list_find(hook_list1, hook))
2136                         return false;
2137
2138                 n++;
2139         }
2140         list_for_each_entry(hook, hook_list1, list)
2141                 m++;
2142
2143         return n == m;
2144 }
2145
2146 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2147                               u32 flags, const struct nlattr *attr,
2148                               struct netlink_ext_ack *extack)
2149 {
2150         const struct nlattr * const *nla = ctx->nla;
2151         struct nft_table *table = ctx->table;
2152         struct nft_chain *chain = ctx->chain;
2153         struct nft_base_chain *basechain;
2154         struct nft_stats *stats = NULL;
2155         struct nft_chain_hook hook;
2156         struct nf_hook_ops *ops;
2157         struct nft_trans *trans;
2158         int err;
2159
2160         if (chain->flags ^ flags)
2161                 return -EOPNOTSUPP;
2162
2163         if (nla[NFTA_CHAIN_HOOK]) {
2164                 if (!nft_is_base_chain(chain)) {
2165                         NL_SET_BAD_ATTR(extack, attr);
2166                         return -EEXIST;
2167                 }
2168                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2169                                            false);
2170                 if (err < 0)
2171                         return err;
2172
2173                 basechain = nft_base_chain(chain);
2174                 if (basechain->type != hook.type) {
2175                         nft_chain_release_hook(&hook);
2176                         NL_SET_BAD_ATTR(extack, attr);
2177                         return -EEXIST;
2178                 }
2179
2180                 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2181                         if (!nft_hook_list_equal(&basechain->hook_list,
2182                                                  &hook.list)) {
2183                                 nft_chain_release_hook(&hook);
2184                                 NL_SET_BAD_ATTR(extack, attr);
2185                                 return -EEXIST;
2186                         }
2187                 } else {
2188                         ops = &basechain->ops;
2189                         if (ops->hooknum != hook.num ||
2190                             ops->priority != hook.priority) {
2191                                 nft_chain_release_hook(&hook);
2192                                 NL_SET_BAD_ATTR(extack, attr);
2193                                 return -EEXIST;
2194                         }
2195                 }
2196                 nft_chain_release_hook(&hook);
2197         }
2198
2199         if (nla[NFTA_CHAIN_HANDLE] &&
2200             nla[NFTA_CHAIN_NAME]) {
2201                 struct nft_chain *chain2;
2202
2203                 chain2 = nft_chain_lookup(ctx->net, table,
2204                                           nla[NFTA_CHAIN_NAME], genmask);
2205                 if (!IS_ERR(chain2)) {
2206                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2207                         return -EEXIST;
2208                 }
2209         }
2210
2211         if (nla[NFTA_CHAIN_COUNTERS]) {
2212                 if (!nft_is_base_chain(chain))
2213                         return -EOPNOTSUPP;
2214
2215                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2216                 if (IS_ERR(stats))
2217                         return PTR_ERR(stats);
2218         }
2219
2220         err = -ENOMEM;
2221         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2222                                 sizeof(struct nft_trans_chain));
2223         if (trans == NULL)
2224                 goto err;
2225
2226         nft_trans_chain_stats(trans) = stats;
2227         nft_trans_chain_update(trans) = true;
2228
2229         if (nla[NFTA_CHAIN_POLICY])
2230                 nft_trans_chain_policy(trans) = policy;
2231         else
2232                 nft_trans_chain_policy(trans) = -1;
2233
2234         if (nla[NFTA_CHAIN_HANDLE] &&
2235             nla[NFTA_CHAIN_NAME]) {
2236                 struct nft_trans *tmp;
2237                 char *name;
2238
2239                 err = -ENOMEM;
2240                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2241                 if (!name)
2242                         goto err;
2243
2244                 err = -EEXIST;
2245                 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
2246                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2247                             tmp->ctx.table == table &&
2248                             nft_trans_chain_update(tmp) &&
2249                             nft_trans_chain_name(tmp) &&
2250                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2251                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2252                                 kfree(name);
2253                                 goto err;
2254                         }
2255                 }
2256
2257                 nft_trans_chain_name(trans) = name;
2258         }
2259         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2260
2261         return 0;
2262 err:
2263         free_percpu(stats);
2264         kfree(trans);
2265         return err;
2266 }
2267
2268 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2269                                                const struct nlattr *nla)
2270 {
2271         u32 id = ntohl(nla_get_be32(nla));
2272         struct nft_trans *trans;
2273
2274         list_for_each_entry(trans, &net->nft.commit_list, list) {
2275                 struct nft_chain *chain = trans->ctx.chain;
2276
2277                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2278                     id == nft_trans_chain_id(trans))
2279                         return chain;
2280         }
2281         return ERR_PTR(-ENOENT);
2282 }
2283
2284 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
2285                               struct sk_buff *skb, const struct nlmsghdr *nlh,
2286                               const struct nlattr * const nla[],
2287                               struct netlink_ext_ack *extack)
2288 {
2289         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2290         u8 genmask = nft_genmask_next(net);
2291         int family = nfmsg->nfgen_family;
2292         struct nft_chain *chain = NULL;
2293         const struct nlattr *attr;
2294         struct nft_table *table;
2295         u8 policy = NF_ACCEPT;
2296         struct nft_ctx ctx;
2297         u64 handle = 0;
2298         u32 flags = 0;
2299
2300         lockdep_assert_held(&net->nft.commit_mutex);
2301
2302         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2303         if (IS_ERR(table)) {
2304                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2305                 return PTR_ERR(table);
2306         }
2307
2308         chain = NULL;
2309         attr = nla[NFTA_CHAIN_NAME];
2310
2311         if (nla[NFTA_CHAIN_HANDLE]) {
2312                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2313                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2314                 if (IS_ERR(chain)) {
2315                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2316                         return PTR_ERR(chain);
2317                 }
2318                 attr = nla[NFTA_CHAIN_HANDLE];
2319         } else if (nla[NFTA_CHAIN_NAME]) {
2320                 chain = nft_chain_lookup(net, table, attr, genmask);
2321                 if (IS_ERR(chain)) {
2322                         if (PTR_ERR(chain) != -ENOENT) {
2323                                 NL_SET_BAD_ATTR(extack, attr);
2324                                 return PTR_ERR(chain);
2325                         }
2326                         chain = NULL;
2327                 }
2328         } else if (!nla[NFTA_CHAIN_ID]) {
2329                 return -EINVAL;
2330         }
2331
2332         if (nla[NFTA_CHAIN_POLICY]) {
2333                 if (chain != NULL &&
2334                     !nft_is_base_chain(chain)) {
2335                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2336                         return -EOPNOTSUPP;
2337                 }
2338
2339                 if (chain == NULL &&
2340                     nla[NFTA_CHAIN_HOOK] == NULL) {
2341                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2342                         return -EOPNOTSUPP;
2343                 }
2344
2345                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2346                 switch (policy) {
2347                 case NF_DROP:
2348                 case NF_ACCEPT:
2349                         break;
2350                 default:
2351                         return -EINVAL;
2352                 }
2353         }
2354
2355         if (nla[NFTA_CHAIN_FLAGS])
2356                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2357         else if (chain)
2358                 flags = chain->flags;
2359
2360         if (flags & ~NFT_CHAIN_FLAGS)
2361                 return -EOPNOTSUPP;
2362
2363         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2364
2365         if (chain != NULL) {
2366                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2367                         NL_SET_BAD_ATTR(extack, attr);
2368                         return -EEXIST;
2369                 }
2370                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2371                         return -EOPNOTSUPP;
2372
2373                 flags |= chain->flags & NFT_CHAIN_BASE;
2374                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2375                                           extack);
2376         }
2377
2378         return nf_tables_addchain(&ctx, family, genmask, policy, flags);
2379 }
2380
2381 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
2382                               struct sk_buff *skb, const struct nlmsghdr *nlh,
2383                               const struct nlattr * const nla[],
2384                               struct netlink_ext_ack *extack)
2385 {
2386         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2387         u8 genmask = nft_genmask_next(net);
2388         int family = nfmsg->nfgen_family;
2389         const struct nlattr *attr;
2390         struct nft_table *table;
2391         struct nft_chain *chain;
2392         struct nft_rule *rule;
2393         struct nft_ctx ctx;
2394         u64 handle;
2395         u32 use;
2396         int err;
2397
2398         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2399         if (IS_ERR(table)) {
2400                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2401                 return PTR_ERR(table);
2402         }
2403
2404         if (nla[NFTA_CHAIN_HANDLE]) {
2405                 attr = nla[NFTA_CHAIN_HANDLE];
2406                 handle = be64_to_cpu(nla_get_be64(attr));
2407                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2408         } else {
2409                 attr = nla[NFTA_CHAIN_NAME];
2410                 chain = nft_chain_lookup(net, table, attr, genmask);
2411         }
2412         if (IS_ERR(chain)) {
2413                 NL_SET_BAD_ATTR(extack, attr);
2414                 return PTR_ERR(chain);
2415         }
2416
2417         if (nlh->nlmsg_flags & NLM_F_NONREC &&
2418             chain->use > 0)
2419                 return -EBUSY;
2420
2421         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2422
2423         use = chain->use;
2424         list_for_each_entry(rule, &chain->rules, list) {
2425                 if (!nft_is_active_next(net, rule))
2426                         continue;
2427                 use--;
2428
2429                 err = nft_delrule(&ctx, rule);
2430                 if (err < 0)
2431                         return err;
2432         }
2433
2434         /* There are rules and elements that are still holding references to us,
2435          * we cannot do a recursive removal in this case.
2436          */
2437         if (use > 0) {
2438                 NL_SET_BAD_ATTR(extack, attr);
2439                 return -EBUSY;
2440         }
2441
2442         return nft_delchain(&ctx);
2443 }
2444
2445 /*
2446  * Expressions
2447  */
2448
2449 /**
2450  *      nft_register_expr - register nf_tables expr type
2451  *      @type: expr type
2452  *
2453  *      Registers the expr type for use with nf_tables. Returns zero on
2454  *      success or a negative errno code otherwise.
2455  */
2456 int nft_register_expr(struct nft_expr_type *type)
2457 {
2458         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2459         if (type->family == NFPROTO_UNSPEC)
2460                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2461         else
2462                 list_add_rcu(&type->list, &nf_tables_expressions);
2463         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2464         return 0;
2465 }
2466 EXPORT_SYMBOL_GPL(nft_register_expr);
2467
2468 /**
2469  *      nft_unregister_expr - unregister nf_tables expr type
2470  *      @type: expr type
2471  *
2472  *      Unregisters the expr typefor use with nf_tables.
2473  */
2474 void nft_unregister_expr(struct nft_expr_type *type)
2475 {
2476         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2477         list_del_rcu(&type->list);
2478         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2479 }
2480 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2481
2482 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2483                                                        struct nlattr *nla)
2484 {
2485         const struct nft_expr_type *type, *candidate = NULL;
2486
2487         list_for_each_entry(type, &nf_tables_expressions, list) {
2488                 if (!nla_strcmp(nla, type->name)) {
2489                         if (!type->family && !candidate)
2490                                 candidate = type;
2491                         else if (type->family == family)
2492                                 candidate = type;
2493                 }
2494         }
2495         return candidate;
2496 }
2497
2498 #ifdef CONFIG_MODULES
2499 static int nft_expr_type_request_module(struct net *net, u8 family,
2500                                         struct nlattr *nla)
2501 {
2502         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2503                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2504                 return -EAGAIN;
2505
2506         return 0;
2507 }
2508 #endif
2509
2510 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2511                                                      u8 family,
2512                                                      struct nlattr *nla)
2513 {
2514         const struct nft_expr_type *type;
2515
2516         if (nla == NULL)
2517                 return ERR_PTR(-EINVAL);
2518
2519         type = __nft_expr_type_get(family, nla);
2520         if (type != NULL && try_module_get(type->owner))
2521                 return type;
2522
2523         lockdep_nfnl_nft_mutex_not_held();
2524 #ifdef CONFIG_MODULES
2525         if (type == NULL) {
2526                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2527                         return ERR_PTR(-EAGAIN);
2528
2529                 if (nft_request_module(net, "nft-expr-%.*s",
2530                                        nla_len(nla),
2531                                        (char *)nla_data(nla)) == -EAGAIN)
2532                         return ERR_PTR(-EAGAIN);
2533         }
2534 #endif
2535         return ERR_PTR(-ENOENT);
2536 }
2537
2538 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2539         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2540                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2541         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2542 };
2543
2544 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2545                                     const struct nft_expr *expr)
2546 {
2547         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2548                 goto nla_put_failure;
2549
2550         if (expr->ops->dump) {
2551                 struct nlattr *data = nla_nest_start_noflag(skb,
2552                                                             NFTA_EXPR_DATA);
2553                 if (data == NULL)
2554                         goto nla_put_failure;
2555                 if (expr->ops->dump(skb, expr) < 0)
2556                         goto nla_put_failure;
2557                 nla_nest_end(skb, data);
2558         }
2559
2560         return skb->len;
2561
2562 nla_put_failure:
2563         return -1;
2564 };
2565
2566 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2567                   const struct nft_expr *expr)
2568 {
2569         struct nlattr *nest;
2570
2571         nest = nla_nest_start_noflag(skb, attr);
2572         if (!nest)
2573                 goto nla_put_failure;
2574         if (nf_tables_fill_expr_info(skb, expr) < 0)
2575                 goto nla_put_failure;
2576         nla_nest_end(skb, nest);
2577         return 0;
2578
2579 nla_put_failure:
2580         return -1;
2581 }
2582
2583 struct nft_expr_info {
2584         const struct nft_expr_ops       *ops;
2585         const struct nlattr             *attr;
2586         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2587 };
2588
2589 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2590                                 const struct nlattr *nla,
2591                                 struct nft_expr_info *info)
2592 {
2593         const struct nft_expr_type *type;
2594         const struct nft_expr_ops *ops;
2595         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2596         int err;
2597
2598         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2599                                           nft_expr_policy, NULL);
2600         if (err < 0)
2601                 return err;
2602
2603         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2604         if (IS_ERR(type))
2605                 return PTR_ERR(type);
2606
2607         if (tb[NFTA_EXPR_DATA]) {
2608                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2609                                                   tb[NFTA_EXPR_DATA],
2610                                                   type->policy, NULL);
2611                 if (err < 0)
2612                         goto err1;
2613         } else
2614                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2615
2616         if (type->select_ops != NULL) {
2617                 ops = type->select_ops(ctx,
2618                                        (const struct nlattr * const *)info->tb);
2619                 if (IS_ERR(ops)) {
2620                         err = PTR_ERR(ops);
2621 #ifdef CONFIG_MODULES
2622                         if (err == -EAGAIN)
2623                                 if (nft_expr_type_request_module(ctx->net,
2624                                                                  ctx->family,
2625                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2626                                         err = -ENOENT;
2627 #endif
2628                         goto err1;
2629                 }
2630         } else
2631                 ops = type->ops;
2632
2633         info->attr = nla;
2634         info->ops = ops;
2635
2636         return 0;
2637
2638 err1:
2639         module_put(type->owner);
2640         return err;
2641 }
2642
2643 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2644                              const struct nft_expr_info *info,
2645                              struct nft_expr *expr)
2646 {
2647         const struct nft_expr_ops *ops = info->ops;
2648         int err;
2649
2650         expr->ops = ops;
2651         if (ops->init) {
2652                 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2653                 if (err < 0)
2654                         goto err1;
2655         }
2656
2657         return 0;
2658 err1:
2659         expr->ops = NULL;
2660         return err;
2661 }
2662
2663 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2664                                    struct nft_expr *expr)
2665 {
2666         const struct nft_expr_type *type = expr->ops->type;
2667
2668         if (expr->ops->destroy)
2669                 expr->ops->destroy(ctx, expr);
2670         module_put(type->owner);
2671 }
2672
2673 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2674                                       const struct nlattr *nla)
2675 {
2676         struct nft_expr_info info;
2677         struct nft_expr *expr;
2678         struct module *owner;
2679         int err;
2680
2681         err = nf_tables_expr_parse(ctx, nla, &info);
2682         if (err < 0)
2683                 goto err1;
2684
2685         err = -ENOMEM;
2686         expr = kzalloc(info.ops->size, GFP_KERNEL);
2687         if (expr == NULL)
2688                 goto err2;
2689
2690         err = nf_tables_newexpr(ctx, &info, expr);
2691         if (err < 0)
2692                 goto err3;
2693
2694         return expr;
2695 err3:
2696         kfree(expr);
2697 err2:
2698         owner = info.ops->type->owner;
2699         if (info.ops->type->release_ops)
2700                 info.ops->type->release_ops(info.ops);
2701
2702         module_put(owner);
2703 err1:
2704         return ERR_PTR(err);
2705 }
2706
2707 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2708 {
2709         int err;
2710
2711         if (src->ops->clone) {
2712                 dst->ops = src->ops;
2713                 err = src->ops->clone(dst, src);
2714                 if (err < 0)
2715                         return err;
2716         } else {
2717                 memcpy(dst, src, src->ops->size);
2718         }
2719
2720         __module_get(src->ops->type->owner);
2721
2722         return 0;
2723 }
2724
2725 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2726 {
2727         nf_tables_expr_destroy(ctx, expr);
2728         kfree(expr);
2729 }
2730
2731 /*
2732  * Rules
2733  */
2734
2735 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2736                                           u64 handle)
2737 {
2738         struct nft_rule *rule;
2739
2740         // FIXME: this sucks
2741         list_for_each_entry_rcu(rule, &chain->rules, list) {
2742                 if (handle == rule->handle)
2743                         return rule;
2744         }
2745
2746         return ERR_PTR(-ENOENT);
2747 }
2748
2749 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2750                                         const struct nlattr *nla)
2751 {
2752         if (nla == NULL)
2753                 return ERR_PTR(-EINVAL);
2754
2755         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2756 }
2757
2758 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2759         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
2760                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
2761         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
2762                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
2763         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
2764         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2765         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
2766         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
2767         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
2768                                     .len = NFT_USERDATA_MAXLEN },
2769         [NFTA_RULE_ID]          = { .type = NLA_U32 },
2770         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2771         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
2772 };
2773
2774 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2775                                     u32 portid, u32 seq, int event,
2776                                     u32 flags, int family,
2777                                     const struct nft_table *table,
2778                                     const struct nft_chain *chain,
2779                                     const struct nft_rule *rule,
2780                                     const struct nft_rule *prule)
2781 {
2782         struct nlmsghdr *nlh;
2783         struct nfgenmsg *nfmsg;
2784         const struct nft_expr *expr, *next;
2785         struct nlattr *list;
2786         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2787
2788         nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2789         if (nlh == NULL)
2790                 goto nla_put_failure;
2791
2792         nfmsg = nlmsg_data(nlh);
2793         nfmsg->nfgen_family     = family;
2794         nfmsg->version          = NFNETLINK_V0;
2795         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
2796
2797         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2798                 goto nla_put_failure;
2799         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2800                 goto nla_put_failure;
2801         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2802                          NFTA_RULE_PAD))
2803                 goto nla_put_failure;
2804
2805         if (event != NFT_MSG_DELRULE && prule) {
2806                 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2807                                  cpu_to_be64(prule->handle),
2808                                  NFTA_RULE_PAD))
2809                         goto nla_put_failure;
2810         }
2811
2812         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2813         if (list == NULL)
2814                 goto nla_put_failure;
2815         nft_rule_for_each_expr(expr, next, rule) {
2816                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2817                         goto nla_put_failure;
2818         }
2819         nla_nest_end(skb, list);
2820
2821         if (rule->udata) {
2822                 struct nft_userdata *udata = nft_userdata(rule);
2823                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2824                             udata->data) < 0)
2825                         goto nla_put_failure;
2826         }
2827
2828         nlmsg_end(skb, nlh);
2829         return 0;
2830
2831 nla_put_failure:
2832         nlmsg_trim(skb, nlh);
2833         return -1;
2834 }
2835
2836 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2837                                   const struct nft_rule *rule, int event)
2838 {
2839         struct sk_buff *skb;
2840         int err;
2841         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
2842                               ctx->table->name, ctx->table->handle,
2843                               ctx->chain->name, ctx->chain->handle);
2844
2845         audit_log_nfcfg(buf,
2846                         ctx->family,
2847                         rule->handle,
2848                         event == NFT_MSG_NEWRULE ?
2849                                 AUDIT_NFT_OP_RULE_REGISTER :
2850                                 AUDIT_NFT_OP_RULE_UNREGISTER,
2851                         GFP_KERNEL);
2852         kfree(buf);
2853
2854         if (!ctx->report &&
2855             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2856                 return;
2857
2858         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2859         if (skb == NULL)
2860                 goto err;
2861
2862         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2863                                        event, 0, ctx->family, ctx->table,
2864                                        ctx->chain, rule, NULL);
2865         if (err < 0) {
2866                 kfree_skb(skb);
2867                 goto err;
2868         }
2869
2870         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
2871         return;
2872 err:
2873         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2874 }
2875
2876 struct nft_rule_dump_ctx {
2877         char *table;
2878         char *chain;
2879 };
2880
2881 static int __nf_tables_dump_rules(struct sk_buff *skb,
2882                                   unsigned int *idx,
2883                                   struct netlink_callback *cb,
2884                                   const struct nft_table *table,
2885                                   const struct nft_chain *chain)
2886 {
2887         struct net *net = sock_net(skb->sk);
2888         const struct nft_rule *rule, *prule;
2889         unsigned int s_idx = cb->args[0];
2890
2891         prule = NULL;
2892         list_for_each_entry_rcu(rule, &chain->rules, list) {
2893                 if (!nft_is_active(net, rule))
2894                         goto cont_skip;
2895                 if (*idx < s_idx)
2896                         goto cont;
2897                 if (*idx > s_idx) {
2898                         memset(&cb->args[1], 0,
2899                                         sizeof(cb->args) - sizeof(cb->args[0]));
2900                 }
2901                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2902                                         cb->nlh->nlmsg_seq,
2903                                         NFT_MSG_NEWRULE,
2904                                         NLM_F_MULTI | NLM_F_APPEND,
2905                                         table->family,
2906                                         table, chain, rule, prule) < 0)
2907                         return 1;
2908
2909                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2910 cont:
2911                 prule = rule;
2912 cont_skip:
2913                 (*idx)++;
2914         }
2915         return 0;
2916 }
2917
2918 static int nf_tables_dump_rules(struct sk_buff *skb,
2919                                 struct netlink_callback *cb)
2920 {
2921         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2922         const struct nft_rule_dump_ctx *ctx = cb->data;
2923         struct nft_table *table;
2924         const struct nft_chain *chain;
2925         unsigned int idx = 0;
2926         struct net *net = sock_net(skb->sk);
2927         int family = nfmsg->nfgen_family;
2928
2929         rcu_read_lock();
2930         cb->seq = net->nft.base_seq;
2931
2932         list_for_each_entry_rcu(table, &net->nft.tables, list) {
2933                 if (family != NFPROTO_UNSPEC && family != table->family)
2934                         continue;
2935
2936                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2937                         continue;
2938
2939                 if (ctx && ctx->table && ctx->chain) {
2940                         struct rhlist_head *list, *tmp;
2941
2942                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
2943                                                nft_chain_ht_params);
2944                         if (!list)
2945                                 goto done;
2946
2947                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2948                                 if (!nft_is_active(net, chain))
2949                                         continue;
2950                                 __nf_tables_dump_rules(skb, &idx,
2951                                                        cb, table, chain);
2952                                 break;
2953                         }
2954                         goto done;
2955                 }
2956
2957                 list_for_each_entry_rcu(chain, &table->chains, list) {
2958                         if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2959                                 goto done;
2960                 }
2961
2962                 if (ctx && ctx->table)
2963                         break;
2964         }
2965 done:
2966         rcu_read_unlock();
2967
2968         cb->args[0] = idx;
2969         return skb->len;
2970 }
2971
2972 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2973 {
2974         const struct nlattr * const *nla = cb->data;
2975         struct nft_rule_dump_ctx *ctx = NULL;
2976
2977         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2978                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2979                 if (!ctx)
2980                         return -ENOMEM;
2981
2982                 if (nla[NFTA_RULE_TABLE]) {
2983                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2984                                                         GFP_ATOMIC);
2985                         if (!ctx->table) {
2986                                 kfree(ctx);
2987                                 return -ENOMEM;
2988                         }
2989                 }
2990                 if (nla[NFTA_RULE_CHAIN]) {
2991                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2992                                                 GFP_ATOMIC);
2993                         if (!ctx->chain) {
2994                                 kfree(ctx->table);
2995                                 kfree(ctx);
2996                                 return -ENOMEM;
2997                         }
2998                 }
2999         }
3000
3001         cb->data = ctx;
3002         return 0;
3003 }
3004
3005 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3006 {
3007         struct nft_rule_dump_ctx *ctx = cb->data;
3008
3009         if (ctx) {
3010                 kfree(ctx->table);
3011                 kfree(ctx->chain);
3012                 kfree(ctx);
3013         }
3014         return 0;
3015 }
3016
3017 /* called with rcu_read_lock held */
3018 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
3019                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3020                              const struct nlattr * const nla[],
3021                              struct netlink_ext_ack *extack)
3022 {
3023         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3024         u8 genmask = nft_genmask_cur(net);
3025         const struct nft_chain *chain;
3026         const struct nft_rule *rule;
3027         struct nft_table *table;
3028         struct sk_buff *skb2;
3029         int family = nfmsg->nfgen_family;
3030         int err;
3031
3032         if (nlh->nlmsg_flags & NLM_F_DUMP) {
3033                 struct netlink_dump_control c = {
3034                         .start= nf_tables_dump_rules_start,
3035                         .dump = nf_tables_dump_rules,
3036                         .done = nf_tables_dump_rules_done,
3037                         .module = THIS_MODULE,
3038                         .data = (void *)nla,
3039                 };
3040
3041                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3042         }
3043
3044         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3045         if (IS_ERR(table)) {
3046                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3047                 return PTR_ERR(table);
3048         }
3049
3050         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3051         if (IS_ERR(chain)) {
3052                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3053                 return PTR_ERR(chain);
3054         }
3055
3056         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3057         if (IS_ERR(rule)) {
3058                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3059                 return PTR_ERR(rule);
3060         }
3061
3062         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3063         if (!skb2)
3064                 return -ENOMEM;
3065
3066         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3067                                        nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3068                                        family, table, chain, rule, NULL);
3069         if (err < 0)
3070                 goto err_fill_rule_info;
3071
3072         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3073
3074 err_fill_rule_info:
3075         kfree_skb(skb2);
3076         return err;
3077 }
3078
3079 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3080                                    struct nft_rule *rule)
3081 {
3082         struct nft_expr *expr, *next;
3083
3084         /*
3085          * Careful: some expressions might not be initialized in case this
3086          * is called on error from nf_tables_newrule().
3087          */
3088         expr = nft_expr_first(rule);
3089         while (nft_expr_more(rule, expr)) {
3090                 next = nft_expr_next(expr);
3091                 nf_tables_expr_destroy(ctx, expr);
3092                 expr = next;
3093         }
3094         kfree(rule);
3095 }
3096
3097 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3098 {
3099         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3100         nf_tables_rule_destroy(ctx, rule);
3101 }
3102
3103 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3104 {
3105         struct nft_expr *expr, *last;
3106         const struct nft_data *data;
3107         struct nft_rule *rule;
3108         int err;
3109
3110         if (ctx->level == NFT_JUMP_STACK_SIZE)
3111                 return -EMLINK;
3112
3113         list_for_each_entry(rule, &chain->rules, list) {
3114                 if (!nft_is_active_next(ctx->net, rule))
3115                         continue;
3116
3117                 nft_rule_for_each_expr(expr, last, rule) {
3118                         if (!expr->ops->validate)
3119                                 continue;
3120
3121                         err = expr->ops->validate(ctx, expr, &data);
3122                         if (err < 0)
3123                                 return err;
3124                 }
3125         }
3126
3127         return 0;
3128 }
3129 EXPORT_SYMBOL_GPL(nft_chain_validate);
3130
3131 static int nft_table_validate(struct net *net, const struct nft_table *table)
3132 {
3133         struct nft_chain *chain;
3134         struct nft_ctx ctx = {
3135                 .net    = net,
3136                 .family = table->family,
3137         };
3138         int err;
3139
3140         list_for_each_entry(chain, &table->chains, list) {
3141                 if (!nft_is_base_chain(chain))
3142                         continue;
3143
3144                 ctx.chain = chain;
3145                 err = nft_chain_validate(&ctx, chain);
3146                 if (err < 0)
3147                         return err;
3148         }
3149
3150         return 0;
3151 }
3152
3153 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3154                                              const struct nlattr *nla);
3155
3156 #define NFT_RULE_MAXEXPRS       128
3157
3158 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
3159                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3160                              const struct nlattr * const nla[],
3161                              struct netlink_ext_ack *extack)
3162 {
3163         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3164         u8 genmask = nft_genmask_next(net);
3165         struct nft_expr_info *info = NULL;
3166         int family = nfmsg->nfgen_family;
3167         struct nft_flow_rule *flow;
3168         struct nft_table *table;
3169         struct nft_chain *chain;
3170         struct nft_rule *rule, *old_rule = NULL;
3171         struct nft_userdata *udata;
3172         struct nft_trans *trans = NULL;
3173         struct nft_expr *expr;
3174         struct nft_ctx ctx;
3175         struct nlattr *tmp;
3176         unsigned int size, i, n, ulen = 0, usize = 0;
3177         int err, rem;
3178         u64 handle, pos_handle;
3179
3180         lockdep_assert_held(&net->nft.commit_mutex);
3181
3182         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3183         if (IS_ERR(table)) {
3184                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3185                 return PTR_ERR(table);
3186         }
3187
3188         if (nla[NFTA_RULE_CHAIN]) {
3189                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3190                                          genmask);
3191                 if (IS_ERR(chain)) {
3192                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3193                         return PTR_ERR(chain);
3194                 }
3195                 if (nft_chain_is_bound(chain))
3196                         return -EOPNOTSUPP;
3197
3198         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3199                 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3200                 if (IS_ERR(chain)) {
3201                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3202                         return PTR_ERR(chain);
3203                 }
3204         } else {
3205                 return -EINVAL;
3206         }
3207
3208         if (nla[NFTA_RULE_HANDLE]) {
3209                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3210                 rule = __nft_rule_lookup(chain, handle);
3211                 if (IS_ERR(rule)) {
3212                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3213                         return PTR_ERR(rule);
3214                 }
3215
3216                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3217                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3218                         return -EEXIST;
3219                 }
3220                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3221                         old_rule = rule;
3222                 else
3223                         return -EOPNOTSUPP;
3224         } else {
3225                 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
3226                     nlh->nlmsg_flags & NLM_F_REPLACE)
3227                         return -EINVAL;
3228                 handle = nf_tables_alloc_handle(table);
3229
3230                 if (chain->use == UINT_MAX)
3231                         return -EOVERFLOW;
3232
3233                 if (nla[NFTA_RULE_POSITION]) {
3234                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3235                         old_rule = __nft_rule_lookup(chain, pos_handle);
3236                         if (IS_ERR(old_rule)) {
3237                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3238                                 return PTR_ERR(old_rule);
3239                         }
3240                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3241                         old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3242                         if (IS_ERR(old_rule)) {
3243                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3244                                 return PTR_ERR(old_rule);
3245                         }
3246                 }
3247         }
3248
3249         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3250
3251         n = 0;
3252         size = 0;
3253         if (nla[NFTA_RULE_EXPRESSIONS]) {
3254                 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3255                                       sizeof(struct nft_expr_info),
3256                                       GFP_KERNEL);
3257                 if (!info)
3258                         return -ENOMEM;
3259
3260                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3261                         err = -EINVAL;
3262                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3263                                 goto err1;
3264                         if (n == NFT_RULE_MAXEXPRS)
3265                                 goto err1;
3266                         err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
3267                         if (err < 0)
3268                                 goto err1;
3269                         size += info[n].ops->size;
3270                         n++;
3271                 }
3272         }
3273         /* Check for overflow of dlen field */
3274         err = -EFBIG;
3275         if (size >= 1 << 12)
3276                 goto err1;
3277
3278         if (nla[NFTA_RULE_USERDATA]) {
3279                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3280                 if (ulen > 0)
3281                         usize = sizeof(struct nft_userdata) + ulen;
3282         }
3283
3284         err = -ENOMEM;
3285         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3286         if (rule == NULL)
3287                 goto err1;
3288
3289         nft_activate_next(net, rule);
3290
3291         rule->handle = handle;
3292         rule->dlen   = size;
3293         rule->udata  = ulen ? 1 : 0;
3294
3295         if (ulen) {
3296                 udata = nft_userdata(rule);
3297                 udata->len = ulen - 1;
3298                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3299         }
3300
3301         expr = nft_expr_first(rule);
3302         for (i = 0; i < n; i++) {
3303                 err = nf_tables_newexpr(&ctx, &info[i], expr);
3304                 if (err < 0) {
3305                         NL_SET_BAD_ATTR(extack, info[i].attr);
3306                         goto err2;
3307                 }
3308
3309                 if (info[i].ops->validate)
3310                         nft_validate_state_update(net, NFT_VALIDATE_NEED);
3311
3312                 info[i].ops = NULL;
3313                 expr = nft_expr_next(expr);
3314         }
3315
3316         if (nlh->nlmsg_flags & NLM_F_REPLACE) {
3317                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3318                 if (trans == NULL) {
3319                         err = -ENOMEM;
3320                         goto err2;
3321                 }
3322                 err = nft_delrule(&ctx, old_rule);
3323                 if (err < 0) {
3324                         nft_trans_destroy(trans);
3325                         goto err2;
3326                 }
3327
3328                 list_add_tail_rcu(&rule->list, &old_rule->list);
3329         } else {
3330                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3331                 if (!trans) {
3332                         err = -ENOMEM;
3333                         goto err2;
3334                 }
3335
3336                 if (nlh->nlmsg_flags & NLM_F_APPEND) {
3337                         if (old_rule)
3338                                 list_add_rcu(&rule->list, &old_rule->list);
3339                         else
3340                                 list_add_tail_rcu(&rule->list, &chain->rules);
3341                  } else {
3342                         if (old_rule)
3343                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3344                         else
3345                                 list_add_rcu(&rule->list, &chain->rules);
3346                 }
3347         }
3348         kvfree(info);
3349         chain->use++;
3350
3351         if (net->nft.validate_state == NFT_VALIDATE_DO)
3352                 return nft_table_validate(net, table);
3353
3354         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3355                 flow = nft_flow_rule_create(net, rule);
3356                 if (IS_ERR(flow))
3357                         return PTR_ERR(flow);
3358
3359                 nft_trans_flow_rule(trans) = flow;
3360         }
3361
3362         return 0;
3363 err2:
3364         nf_tables_rule_release(&ctx, rule);
3365 err1:
3366         for (i = 0; i < n; i++) {
3367                 if (info[i].ops) {
3368                         module_put(info[i].ops->type->owner);
3369                         if (info[i].ops->type->release_ops)
3370                                 info[i].ops->type->release_ops(info[i].ops);
3371                 }
3372         }
3373         kvfree(info);
3374         return err;
3375 }
3376
3377 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3378                                              const struct nlattr *nla)
3379 {
3380         u32 id = ntohl(nla_get_be32(nla));
3381         struct nft_trans *trans;
3382
3383         list_for_each_entry(trans, &net->nft.commit_list, list) {
3384                 struct nft_rule *rule = nft_trans_rule(trans);
3385
3386                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3387                     id == nft_trans_rule_id(trans))
3388                         return rule;
3389         }
3390         return ERR_PTR(-ENOENT);
3391 }
3392
3393 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
3394                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3395                              const struct nlattr * const nla[],
3396                              struct netlink_ext_ack *extack)
3397 {
3398         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3399         u8 genmask = nft_genmask_next(net);
3400         struct nft_table *table;
3401         struct nft_chain *chain = NULL;
3402         struct nft_rule *rule;
3403         int family = nfmsg->nfgen_family, err = 0;
3404         struct nft_ctx ctx;
3405
3406         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3407         if (IS_ERR(table)) {
3408                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3409                 return PTR_ERR(table);
3410         }
3411
3412         if (nla[NFTA_RULE_CHAIN]) {
3413                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3414                                          genmask);
3415                 if (IS_ERR(chain)) {
3416                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3417                         return PTR_ERR(chain);
3418                 }
3419                 if (nft_chain_is_bound(chain))
3420                         return -EOPNOTSUPP;
3421         }
3422
3423         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3424
3425         if (chain) {
3426                 if (nla[NFTA_RULE_HANDLE]) {
3427                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3428                         if (IS_ERR(rule)) {
3429                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3430                                 return PTR_ERR(rule);
3431                         }
3432
3433                         err = nft_delrule(&ctx, rule);
3434                 } else if (nla[NFTA_RULE_ID]) {
3435                         rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3436                         if (IS_ERR(rule)) {
3437                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3438                                 return PTR_ERR(rule);
3439                         }
3440
3441                         err = nft_delrule(&ctx, rule);
3442                 } else {
3443                         err = nft_delrule_by_chain(&ctx);
3444                 }
3445         } else {
3446                 list_for_each_entry(chain, &table->chains, list) {
3447                         if (!nft_is_active_next(net, chain))
3448                                 continue;
3449
3450                         ctx.chain = chain;
3451                         err = nft_delrule_by_chain(&ctx);
3452                         if (err < 0)
3453                                 break;
3454                 }
3455         }
3456
3457         return err;
3458 }
3459
3460 /*
3461  * Sets
3462  */
3463 static const struct nft_set_type *nft_set_types[] = {
3464         &nft_set_hash_fast_type,
3465         &nft_set_hash_type,
3466         &nft_set_rhash_type,
3467         &nft_set_bitmap_type,
3468         &nft_set_rbtree_type,
3469 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3470         &nft_set_pipapo_avx2_type,
3471 #endif
3472         &nft_set_pipapo_type,
3473 };
3474
3475 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3476                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3477                                  NFT_SET_EVAL)
3478
3479 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3480 {
3481         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3482 }
3483
3484 /*
3485  * Select a set implementation based on the data characteristics and the
3486  * given policy. The total memory use might not be known if no size is
3487  * given, in that case the amount of memory per element is used.
3488  */
3489 static const struct nft_set_ops *
3490 nft_select_set_ops(const struct nft_ctx *ctx,
3491                    const struct nlattr * const nla[],
3492                    const struct nft_set_desc *desc,
3493                    enum nft_set_policies policy)
3494 {
3495         const struct nft_set_ops *ops, *bops;
3496         struct nft_set_estimate est, best;
3497         const struct nft_set_type *type;
3498         u32 flags = 0;
3499         int i;
3500
3501         lockdep_assert_held(&ctx->net->nft.commit_mutex);
3502         lockdep_nfnl_nft_mutex_not_held();
3503
3504         if (nla[NFTA_SET_FLAGS] != NULL)
3505                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3506
3507         bops        = NULL;
3508         best.size   = ~0;
3509         best.lookup = ~0;
3510         best.space  = ~0;
3511
3512         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3513                 type = nft_set_types[i];
3514                 ops = &type->ops;
3515
3516                 if (!nft_set_ops_candidate(type, flags))
3517                         continue;
3518                 if (!ops->estimate(desc, flags, &est))
3519                         continue;
3520
3521                 switch (policy) {
3522                 case NFT_SET_POL_PERFORMANCE:
3523                         if (est.lookup < best.lookup)
3524                                 break;
3525                         if (est.lookup == best.lookup &&
3526                             est.space < best.space)
3527                                 break;
3528                         continue;
3529                 case NFT_SET_POL_MEMORY:
3530                         if (!desc->size) {
3531                                 if (est.space < best.space)
3532                                         break;
3533                                 if (est.space == best.space &&
3534                                     est.lookup < best.lookup)
3535                                         break;
3536                         } else if (est.size < best.size || !bops) {
3537                                 break;
3538                         }
3539                         continue;
3540                 default:
3541                         break;
3542                 }
3543
3544                 bops = ops;
3545                 best = est;
3546         }
3547
3548         if (bops != NULL)
3549                 return bops;
3550
3551         return ERR_PTR(-EOPNOTSUPP);
3552 }
3553
3554 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3555         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3556                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3557         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3558                                             .len = NFT_SET_MAXNAMELEN - 1 },
3559         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3560         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3561         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3562         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3563         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3564         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3565         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3566         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3567         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3568         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3569         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3570                                             .len  = NFT_USERDATA_MAXLEN },
3571         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3572         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3573         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3574         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
3575 };
3576
3577 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3578         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3579         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3580 };
3581
3582 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
3583                                      const struct sk_buff *skb,
3584                                      const struct nlmsghdr *nlh,
3585                                      const struct nlattr * const nla[],
3586                                      struct netlink_ext_ack *extack,
3587                                      u8 genmask)
3588 {
3589         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3590         int family = nfmsg->nfgen_family;
3591         struct nft_table *table = NULL;
3592
3593         if (nla[NFTA_SET_TABLE] != NULL) {
3594                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3595                                          genmask);
3596                 if (IS_ERR(table)) {
3597                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3598                         return PTR_ERR(table);
3599                 }
3600         }
3601
3602         nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3603         return 0;
3604 }
3605
3606 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3607                                       const struct nlattr *nla, u8 genmask)
3608 {
3609         struct nft_set *set;
3610
3611         if (nla == NULL)
3612                 return ERR_PTR(-EINVAL);
3613
3614         list_for_each_entry_rcu(set, &table->sets, list) {
3615                 if (!nla_strcmp(nla, set->name) &&
3616                     nft_active_genmask(set, genmask))
3617                         return set;
3618         }
3619         return ERR_PTR(-ENOENT);
3620 }
3621
3622 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3623                                                const struct nlattr *nla,
3624                                                u8 genmask)
3625 {
3626         struct nft_set *set;
3627
3628         list_for_each_entry(set, &table->sets, list) {
3629                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3630                     nft_active_genmask(set, genmask))
3631                         return set;
3632         }
3633         return ERR_PTR(-ENOENT);
3634 }
3635
3636 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3637                                            const struct nlattr *nla, u8 genmask)
3638 {
3639         struct nft_trans *trans;
3640         u32 id = ntohl(nla_get_be32(nla));
3641
3642         list_for_each_entry(trans, &net->nft.commit_list, list) {
3643                 if (trans->msg_type == NFT_MSG_NEWSET) {
3644                         struct nft_set *set = nft_trans_set(trans);
3645
3646                         if (id == nft_trans_set_id(trans) &&
3647                             nft_active_genmask(set, genmask))
3648                                 return set;
3649                 }
3650         }
3651         return ERR_PTR(-ENOENT);
3652 }
3653
3654 struct nft_set *nft_set_lookup_global(const struct net *net,
3655                                       const struct nft_table *table,
3656                                       const struct nlattr *nla_set_name,
3657                                       const struct nlattr *nla_set_id,
3658                                       u8 genmask)
3659 {
3660         struct nft_set *set;
3661
3662         set = nft_set_lookup(table, nla_set_name, genmask);
3663         if (IS_ERR(set)) {
3664                 if (!nla_set_id)
3665                         return set;
3666
3667                 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3668         }
3669         return set;
3670 }
3671 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3672
3673 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3674                                     const char *name)
3675 {
3676         const struct nft_set *i;
3677         const char *p;
3678         unsigned long *inuse;
3679         unsigned int n = 0, min = 0;
3680
3681         p = strchr(name, '%');
3682         if (p != NULL) {
3683                 if (p[1] != 'd' || strchr(p + 2, '%'))
3684                         return -EINVAL;
3685
3686                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3687                 if (inuse == NULL)
3688                         return -ENOMEM;
3689 cont:
3690                 list_for_each_entry(i, &ctx->table->sets, list) {
3691                         int tmp;
3692
3693                         if (!nft_is_active_next(ctx->net, set))
3694                                 continue;
3695                         if (!sscanf(i->name, name, &tmp))
3696                                 continue;
3697                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3698                                 continue;
3699
3700                         set_bit(tmp - min, inuse);
3701                 }
3702
3703                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3704                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3705                         min += BITS_PER_BYTE * PAGE_SIZE;
3706                         memset(inuse, 0, PAGE_SIZE);
3707                         goto cont;
3708                 }
3709                 free_page((unsigned long)inuse);
3710         }
3711
3712         set->name = kasprintf(GFP_KERNEL, name, min + n);
3713         if (!set->name)
3714                 return -ENOMEM;
3715
3716         list_for_each_entry(i, &ctx->table->sets, list) {
3717                 if (!nft_is_active_next(ctx->net, i))
3718                         continue;
3719                 if (!strcmp(set->name, i->name)) {
3720                         kfree(set->name);
3721                         set->name = NULL;
3722                         return -ENFILE;
3723                 }
3724         }
3725         return 0;
3726 }
3727
3728 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3729 {
3730         u64 ms = be64_to_cpu(nla_get_be64(nla));
3731         u64 max = (u64)(~((u64)0));
3732
3733         max = div_u64(max, NSEC_PER_MSEC);
3734         if (ms >= max)
3735                 return -ERANGE;
3736
3737         ms *= NSEC_PER_MSEC;
3738         *result = nsecs_to_jiffies64(ms);
3739         return 0;
3740 }
3741
3742 __be64 nf_jiffies64_to_msecs(u64 input)
3743 {
3744         return cpu_to_be64(jiffies64_to_msecs(input));
3745 }
3746
3747 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3748                                      const struct nft_set *set)
3749 {
3750         struct nlattr *concat, *field;
3751         int i;
3752
3753         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3754         if (!concat)
3755                 return -ENOMEM;
3756
3757         for (i = 0; i < set->field_count; i++) {
3758                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3759                 if (!field)
3760                         return -ENOMEM;
3761
3762                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3763                                  htonl(set->field_len[i])))
3764                         return -ENOMEM;
3765
3766                 nla_nest_end(skb, field);
3767         }
3768
3769         nla_nest_end(skb, concat);
3770
3771         return 0;
3772 }
3773
3774 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3775                               const struct nft_set *set, u16 event, u16 flags)
3776 {
3777         struct nfgenmsg *nfmsg;
3778         struct nlmsghdr *nlh;
3779         u32 portid = ctx->portid;
3780         struct nlattr *nest;
3781         u32 seq = ctx->seq;
3782         int i;
3783
3784         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3785         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3786                         flags);
3787         if (nlh == NULL)
3788                 goto nla_put_failure;
3789
3790         nfmsg = nlmsg_data(nlh);
3791         nfmsg->nfgen_family     = ctx->family;
3792         nfmsg->version          = NFNETLINK_V0;
3793         nfmsg->res_id           = htons(ctx->net->nft.base_seq & 0xffff);
3794
3795         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3796                 goto nla_put_failure;
3797         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3798                 goto nla_put_failure;
3799         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3800                          NFTA_SET_PAD))
3801                 goto nla_put_failure;
3802         if (set->flags != 0)
3803                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3804                         goto nla_put_failure;
3805
3806         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3807                 goto nla_put_failure;
3808         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3809                 goto nla_put_failure;
3810         if (set->flags & NFT_SET_MAP) {
3811                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3812                         goto nla_put_failure;
3813                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3814                         goto nla_put_failure;
3815         }
3816         if (set->flags & NFT_SET_OBJECT &&
3817             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3818                 goto nla_put_failure;
3819
3820         if (set->timeout &&
3821             nla_put_be64(skb, NFTA_SET_TIMEOUT,
3822                          nf_jiffies64_to_msecs(set->timeout),
3823                          NFTA_SET_PAD))
3824                 goto nla_put_failure;
3825         if (set->gc_int &&
3826             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3827                 goto nla_put_failure;
3828
3829         if (set->policy != NFT_SET_POL_PERFORMANCE) {
3830                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3831                         goto nla_put_failure;
3832         }
3833
3834         if (set->udata &&
3835             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3836                 goto nla_put_failure;
3837
3838         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3839         if (!nest)
3840                 goto nla_put_failure;
3841         if (set->size &&
3842             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3843                 goto nla_put_failure;
3844
3845         if (set->field_count > 1 &&
3846             nf_tables_fill_set_concat(skb, set))
3847                 goto nla_put_failure;
3848
3849         nla_nest_end(skb, nest);
3850
3851         if (set->num_exprs == 1) {
3852                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3853                 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
3854                         goto nla_put_failure;
3855
3856                 nla_nest_end(skb, nest);
3857         } else if (set->num_exprs > 1) {
3858                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
3859                 if (nest == NULL)
3860                         goto nla_put_failure;
3861
3862                 for (i = 0; i < set->num_exprs; i++) {
3863                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
3864                                           set->exprs[i]) < 0)
3865                                 goto nla_put_failure;
3866                 }
3867                 nla_nest_end(skb, nest);
3868         }
3869
3870         nlmsg_end(skb, nlh);
3871         return 0;
3872
3873 nla_put_failure:
3874         nlmsg_trim(skb, nlh);
3875         return -1;
3876 }
3877
3878 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3879                                  const struct nft_set *set, int event,
3880                                  gfp_t gfp_flags)
3881 {
3882         struct sk_buff *skb;
3883         u32 portid = ctx->portid;
3884         int err;
3885         char *buf = kasprintf(gfp_flags, "%s:%llu;%s:%llu",
3886                               ctx->table->name, ctx->table->handle,
3887                               set->name, set->handle);
3888
3889         audit_log_nfcfg(buf,
3890                         ctx->family,
3891                         set->field_count,
3892                         event == NFT_MSG_NEWSET ?
3893                                 AUDIT_NFT_OP_SET_REGISTER :
3894                                 AUDIT_NFT_OP_SET_UNREGISTER,
3895                         gfp_flags);
3896         kfree(buf);
3897
3898         if (!ctx->report &&
3899             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3900                 return;
3901
3902         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3903         if (skb == NULL)
3904                 goto err;
3905
3906         err = nf_tables_fill_set(skb, ctx, set, event, 0);
3907         if (err < 0) {
3908                 kfree_skb(skb);
3909                 goto err;
3910         }
3911
3912         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
3913         return;
3914 err:
3915         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3916 }
3917
3918 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3919 {
3920         const struct nft_set *set;
3921         unsigned int idx, s_idx = cb->args[0];
3922         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3923         struct net *net = sock_net(skb->sk);
3924         struct nft_ctx *ctx = cb->data, ctx_set;
3925
3926         if (cb->args[1])
3927                 return skb->len;
3928
3929         rcu_read_lock();
3930         cb->seq = net->nft.base_seq;
3931
3932         list_for_each_entry_rcu(table, &net->nft.tables, list) {
3933                 if (ctx->family != NFPROTO_UNSPEC &&
3934                     ctx->family != table->family)
3935                         continue;
3936
3937                 if (ctx->table && ctx->table != table)
3938                         continue;
3939
3940                 if (cur_table) {
3941                         if (cur_table != table)
3942                                 continue;
3943
3944                         cur_table = NULL;
3945                 }
3946                 idx = 0;
3947                 list_for_each_entry_rcu(set, &table->sets, list) {
3948                         if (idx < s_idx)
3949                                 goto cont;
3950                         if (!nft_is_active(net, set))
3951                                 goto cont;
3952
3953                         ctx_set = *ctx;
3954                         ctx_set.table = table;
3955                         ctx_set.family = table->family;
3956
3957                         if (nf_tables_fill_set(skb, &ctx_set, set,
3958                                                NFT_MSG_NEWSET,
3959                                                NLM_F_MULTI) < 0) {
3960                                 cb->args[0] = idx;
3961                                 cb->args[2] = (unsigned long) table;
3962                                 goto done;
3963                         }
3964                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3965 cont:
3966                         idx++;
3967                 }
3968                 if (s_idx)
3969                         s_idx = 0;
3970         }
3971         cb->args[1] = 1;
3972 done:
3973         rcu_read_unlock();
3974         return skb->len;
3975 }
3976
3977 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3978 {
3979         struct nft_ctx *ctx_dump = NULL;
3980
3981         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3982         if (ctx_dump == NULL)
3983                 return -ENOMEM;
3984
3985         cb->data = ctx_dump;
3986         return 0;
3987 }
3988
3989 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3990 {
3991         kfree(cb->data);
3992         return 0;
3993 }
3994
3995 /* called with rcu_read_lock held */
3996 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3997                             struct sk_buff *skb, const struct nlmsghdr *nlh,
3998                             const struct nlattr * const nla[],
3999                             struct netlink_ext_ack *extack)
4000 {
4001         u8 genmask = nft_genmask_cur(net);
4002         const struct nft_set *set;
4003         struct nft_ctx ctx;
4004         struct sk_buff *skb2;
4005         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4006         int err;
4007
4008         /* Verify existence before starting dump */
4009         err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
4010                                         genmask);
4011         if (err < 0)
4012                 return err;
4013
4014         if (nlh->nlmsg_flags & NLM_F_DUMP) {
4015                 struct netlink_dump_control c = {
4016                         .start = nf_tables_dump_sets_start,
4017                         .dump = nf_tables_dump_sets,
4018                         .done = nf_tables_dump_sets_done,
4019                         .data = &ctx,
4020                         .module = THIS_MODULE,
4021                 };
4022
4023                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4024         }
4025
4026         /* Only accept unspec with dump */
4027         if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4028                 return -EAFNOSUPPORT;
4029         if (!nla[NFTA_SET_TABLE])
4030                 return -EINVAL;
4031
4032         set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
4033         if (IS_ERR(set))
4034                 return PTR_ERR(set);
4035
4036         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4037         if (skb2 == NULL)
4038                 return -ENOMEM;
4039
4040         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4041         if (err < 0)
4042                 goto err_fill_set_info;
4043
4044         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4045
4046 err_fill_set_info:
4047         kfree_skb(skb2);
4048         return err;
4049 }
4050
4051 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4052         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4053 };
4054
4055 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4056                                      struct nft_set_desc *desc)
4057 {
4058         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4059         u32 len;
4060         int err;
4061
4062         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4063                                           nft_concat_policy, NULL);
4064         if (err < 0)
4065                 return err;
4066
4067         if (!tb[NFTA_SET_FIELD_LEN])
4068                 return -EINVAL;
4069
4070         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4071
4072         if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
4073                 return -E2BIG;
4074
4075         desc->field_len[desc->field_count++] = len;
4076
4077         return 0;
4078 }
4079
4080 static int nft_set_desc_concat(struct nft_set_desc *desc,
4081                                const struct nlattr *nla)
4082 {
4083         struct nlattr *attr;
4084         int rem, err;
4085
4086         nla_for_each_nested(attr, nla, rem) {
4087                 if (nla_type(attr) != NFTA_LIST_ELEM)
4088                         return -EINVAL;
4089
4090                 err = nft_set_desc_concat_parse(attr, desc);
4091                 if (err < 0)
4092                         return err;
4093         }
4094
4095         return 0;
4096 }
4097
4098 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4099                                     const struct nlattr *nla)
4100 {
4101         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4102         int err;
4103
4104         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4105                                           nft_set_desc_policy, NULL);
4106         if (err < 0)
4107                 return err;
4108
4109         if (da[NFTA_SET_DESC_SIZE] != NULL)
4110                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4111         if (da[NFTA_SET_DESC_CONCAT])
4112                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4113
4114         return err;
4115 }
4116
4117 static int nf_tables_newset(struct net *net, struct sock *nlsk,
4118                             struct sk_buff *skb, const struct nlmsghdr *nlh,
4119                             const struct nlattr * const nla[],
4120                             struct netlink_ext_ack *extack)
4121 {
4122         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4123         u8 genmask = nft_genmask_next(net);
4124         int family = nfmsg->nfgen_family;
4125         const struct nft_set_ops *ops;
4126         struct nft_expr *expr = NULL;
4127         struct nft_table *table;
4128         struct nft_set *set;
4129         struct nft_ctx ctx;
4130         char *name;
4131         u64 size;
4132         u64 timeout;
4133         u32 ktype, dtype, flags, policy, gc_int, objtype;
4134         struct nft_set_desc desc;
4135         unsigned char *udata;
4136         u16 udlen;
4137         int err;
4138         int i;
4139
4140         if (nla[NFTA_SET_TABLE] == NULL ||
4141             nla[NFTA_SET_NAME] == NULL ||
4142             nla[NFTA_SET_KEY_LEN] == NULL ||
4143             nla[NFTA_SET_ID] == NULL)
4144                 return -EINVAL;
4145
4146         memset(&desc, 0, sizeof(desc));
4147
4148         ktype = NFT_DATA_VALUE;
4149         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4150                 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4151                 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4152                         return -EINVAL;
4153         }
4154
4155         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4156         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4157                 return -EINVAL;
4158
4159         flags = 0;
4160         if (nla[NFTA_SET_FLAGS] != NULL) {
4161                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4162                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4163                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4164                               NFT_SET_MAP | NFT_SET_EVAL |
4165                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4166                         return -EOPNOTSUPP;
4167                 /* Only one of these operations is supported */
4168                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4169                              (NFT_SET_MAP | NFT_SET_OBJECT))
4170                         return -EOPNOTSUPP;
4171                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4172                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4173                         return -EOPNOTSUPP;
4174         }
4175
4176         dtype = 0;
4177         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4178                 if (!(flags & NFT_SET_MAP))
4179                         return -EINVAL;
4180
4181                 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4182                 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4183                     dtype != NFT_DATA_VERDICT)
4184                         return -EINVAL;
4185
4186                 if (dtype != NFT_DATA_VERDICT) {
4187                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4188                                 return -EINVAL;
4189                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4190                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4191                                 return -EINVAL;
4192                 } else
4193                         desc.dlen = sizeof(struct nft_verdict);
4194         } else if (flags & NFT_SET_MAP)
4195                 return -EINVAL;
4196
4197         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4198                 if (!(flags & NFT_SET_OBJECT))
4199                         return -EINVAL;
4200
4201                 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4202                 if (objtype == NFT_OBJECT_UNSPEC ||
4203                     objtype > NFT_OBJECT_MAX)
4204                         return -EOPNOTSUPP;
4205         } else if (flags & NFT_SET_OBJECT)
4206                 return -EINVAL;
4207         else
4208                 objtype = NFT_OBJECT_UNSPEC;
4209
4210         timeout = 0;
4211         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4212                 if (!(flags & NFT_SET_TIMEOUT))
4213                         return -EINVAL;
4214
4215                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4216                 if (err)
4217                         return err;
4218         }
4219         gc_int = 0;
4220         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4221                 if (!(flags & NFT_SET_TIMEOUT))
4222                         return -EINVAL;
4223                 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4224         }
4225
4226         policy = NFT_SET_POL_PERFORMANCE;
4227         if (nla[NFTA_SET_POLICY] != NULL)
4228                 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4229
4230         if (nla[NFTA_SET_DESC] != NULL) {
4231                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4232                 if (err < 0)
4233                         return err;
4234         }
4235
4236         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4237                 desc.expr = true;
4238
4239         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
4240         if (IS_ERR(table)) {
4241                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4242                 return PTR_ERR(table);
4243         }
4244
4245         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
4246
4247         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4248         if (IS_ERR(set)) {
4249                 if (PTR_ERR(set) != -ENOENT) {
4250                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4251                         return PTR_ERR(set);
4252                 }
4253         } else {
4254                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
4255                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4256                         return -EEXIST;
4257                 }
4258                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
4259                         return -EOPNOTSUPP;
4260
4261                 return 0;
4262         }
4263
4264         if (!(nlh->nlmsg_flags & NLM_F_CREATE))
4265                 return -ENOENT;
4266
4267         ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4268         if (IS_ERR(ops))
4269                 return PTR_ERR(ops);
4270
4271         udlen = 0;
4272         if (nla[NFTA_SET_USERDATA])
4273                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4274
4275         size = 0;
4276         if (ops->privsize != NULL)
4277                 size = ops->privsize(nla, &desc);
4278
4279         set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
4280         if (!set)
4281                 return -ENOMEM;
4282
4283         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4284         if (!name) {
4285                 err = -ENOMEM;
4286                 goto err_set_name;
4287         }
4288
4289         err = nf_tables_set_alloc_name(&ctx, set, name);
4290         kfree(name);
4291         if (err < 0)
4292                 goto err_set_alloc_name;
4293
4294         if (nla[NFTA_SET_EXPR]) {
4295                 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4296                 if (IS_ERR(expr)) {
4297                         err = PTR_ERR(expr);
4298                         goto err_set_alloc_name;
4299                 }
4300                 set->exprs[0] = expr;
4301                 set->num_exprs++;
4302         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4303                 struct nft_expr *expr;
4304                 struct nlattr *tmp;
4305                 int left;
4306
4307                 if (!(flags & NFT_SET_EXPR)) {
4308                         err = -EINVAL;
4309                         goto err_set_alloc_name;
4310                 }
4311                 i = 0;
4312                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4313                         if (i == NFT_SET_EXPR_MAX) {
4314                                 err = -E2BIG;
4315                                 goto err_set_init;
4316                         }
4317                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4318                                 err = -EINVAL;
4319                                 goto err_set_init;
4320                         }
4321                         expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
4322                         if (IS_ERR(expr)) {
4323                                 err = PTR_ERR(expr);
4324                                 goto err_set_init;
4325                         }
4326                         set->exprs[i++] = expr;
4327                         set->num_exprs++;
4328                 }
4329         }
4330
4331         udata = NULL;
4332         if (udlen) {
4333                 udata = set->data + size;
4334                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4335         }
4336
4337         INIT_LIST_HEAD(&set->bindings);
4338         set->table = table;
4339         write_pnet(&set->net, net);
4340         set->ops   = ops;
4341         set->ktype = ktype;
4342         set->klen  = desc.klen;
4343         set->dtype = dtype;
4344         set->objtype = objtype;
4345         set->dlen  = desc.dlen;
4346         set->flags = flags;
4347         set->size  = desc.size;
4348         set->policy = policy;
4349         set->udlen  = udlen;
4350         set->udata  = udata;
4351         set->timeout = timeout;
4352         set->gc_int = gc_int;
4353         set->handle = nf_tables_alloc_handle(table);
4354
4355         set->field_count = desc.field_count;
4356         for (i = 0; i < desc.field_count; i++)
4357                 set->field_len[i] = desc.field_len[i];
4358
4359         err = ops->init(set, &desc, nla);
4360         if (err < 0)
4361                 goto err_set_init;
4362
4363         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4364         if (err < 0)
4365                 goto err_set_trans;
4366
4367         list_add_tail_rcu(&set->list, &table->sets);
4368         table->use++;
4369         return 0;
4370
4371 err_set_trans:
4372         ops->destroy(set);
4373 err_set_init:
4374         for (i = 0; i < set->num_exprs; i++)
4375                 nft_expr_destroy(&ctx, set->exprs[i]);
4376 err_set_alloc_name:
4377         kfree(set->name);
4378 err_set_name:
4379         kvfree(set);
4380         return err;
4381 }
4382
4383 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4384 {
4385         int i;
4386
4387         if (WARN_ON(set->use > 0))
4388                 return;
4389
4390         for (i = 0; i < set->num_exprs; i++)
4391                 nft_expr_destroy(ctx, set->exprs[i]);
4392
4393         set->ops->destroy(set);
4394         kfree(set->name);
4395         kvfree(set);
4396 }
4397
4398 static int nf_tables_delset(struct net *net, struct sock *nlsk,
4399                             struct sk_buff *skb, const struct nlmsghdr *nlh,
4400                             const struct nlattr * const nla[],
4401                             struct netlink_ext_ack *extack)
4402 {
4403         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4404         u8 genmask = nft_genmask_next(net);
4405         const struct nlattr *attr;
4406         struct nft_set *set;
4407         struct nft_ctx ctx;
4408         int err;
4409
4410         if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4411                 return -EAFNOSUPPORT;
4412         if (nla[NFTA_SET_TABLE] == NULL)
4413                 return -EINVAL;
4414
4415         err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
4416                                         genmask);
4417         if (err < 0)
4418                 return err;
4419
4420         if (nla[NFTA_SET_HANDLE]) {
4421                 attr = nla[NFTA_SET_HANDLE];
4422                 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
4423         } else {
4424                 attr = nla[NFTA_SET_NAME];
4425                 set = nft_set_lookup(ctx.table, attr, genmask);
4426         }
4427
4428         if (IS_ERR(set)) {
4429                 NL_SET_BAD_ATTR(extack, attr);
4430                 return PTR_ERR(set);
4431         }
4432         if (set->use ||
4433             (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
4434                 NL_SET_BAD_ATTR(extack, attr);
4435                 return -EBUSY;
4436         }
4437
4438         return nft_delset(&ctx, set);
4439 }
4440
4441 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4442                                         struct nft_set *set,
4443                                         const struct nft_set_iter *iter,
4444                                         struct nft_set_elem *elem)
4445 {
4446         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4447         enum nft_registers dreg;
4448
4449         dreg = nft_type_to_reg(set->dtype);
4450         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4451                                            set->dtype == NFT_DATA_VERDICT ?
4452                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4453                                            set->dlen);
4454 }
4455
4456 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4457                        struct nft_set_binding *binding)
4458 {
4459         struct nft_set_binding *i;
4460         struct nft_set_iter iter;
4461
4462         if (set->use == UINT_MAX)
4463                 return -EOVERFLOW;
4464
4465         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4466                 return -EBUSY;
4467
4468         if (binding->flags & NFT_SET_MAP) {
4469                 /* If the set is already bound to the same chain all
4470                  * jumps are already validated for that chain.
4471                  */
4472                 list_for_each_entry(i, &set->bindings, list) {
4473                         if (i->flags & NFT_SET_MAP &&
4474                             i->chain == binding->chain)
4475                                 goto bind;
4476                 }
4477
4478                 iter.genmask    = nft_genmask_next(ctx->net);
4479                 iter.skip       = 0;
4480                 iter.count      = 0;
4481                 iter.err        = 0;
4482                 iter.fn         = nf_tables_bind_check_setelem;
4483
4484                 set->ops->walk(ctx, set, &iter);
4485                 if (iter.err < 0)
4486                         return iter.err;
4487         }
4488 bind:
4489         binding->chain = ctx->chain;
4490         list_add_tail_rcu(&binding->list, &set->bindings);
4491         nft_set_trans_bind(ctx, set);
4492         set->use++;
4493
4494         return 0;
4495 }
4496 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4497
4498 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4499                                  struct nft_set_binding *binding, bool event)
4500 {
4501         list_del_rcu(&binding->list);
4502
4503         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4504                 list_del_rcu(&set->list);
4505                 if (event)
4506                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4507                                              GFP_KERNEL);
4508         }
4509 }
4510
4511 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4512                               struct nft_set_binding *binding,
4513                               enum nft_trans_phase phase)
4514 {
4515         switch (phase) {
4516         case NFT_TRANS_PREPARE:
4517                 set->use--;
4518                 return;
4519         case NFT_TRANS_ABORT:
4520         case NFT_TRANS_RELEASE:
4521                 set->use--;
4522                 fallthrough;
4523         default:
4524                 nf_tables_unbind_set(ctx, set, binding,
4525                                      phase == NFT_TRANS_COMMIT);
4526         }
4527 }
4528 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4529
4530 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4531 {
4532         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4533                 nft_set_destroy(ctx, set);
4534 }
4535 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4536
4537 const struct nft_set_ext_type nft_set_ext_types[] = {
4538         [NFT_SET_EXT_KEY]               = {
4539                 .align  = __alignof__(u32),
4540         },
4541         [NFT_SET_EXT_DATA]              = {
4542                 .align  = __alignof__(u32),
4543         },
4544         [NFT_SET_EXT_EXPRESSIONS]       = {
4545                 .align  = __alignof__(struct nft_set_elem_expr),
4546         },
4547         [NFT_SET_EXT_OBJREF]            = {
4548                 .len    = sizeof(struct nft_object *),
4549                 .align  = __alignof__(struct nft_object *),
4550         },
4551         [NFT_SET_EXT_FLAGS]             = {
4552                 .len    = sizeof(u8),
4553                 .align  = __alignof__(u8),
4554         },
4555         [NFT_SET_EXT_TIMEOUT]           = {
4556                 .len    = sizeof(u64),
4557                 .align  = __alignof__(u64),
4558         },
4559         [NFT_SET_EXT_EXPIRATION]        = {
4560                 .len    = sizeof(u64),
4561                 .align  = __alignof__(u64),
4562         },
4563         [NFT_SET_EXT_USERDATA]          = {
4564                 .len    = sizeof(struct nft_userdata),
4565                 .align  = __alignof__(struct nft_userdata),
4566         },
4567         [NFT_SET_EXT_KEY_END]           = {
4568                 .align  = __alignof__(u32),
4569         },
4570 };
4571
4572 /*
4573  * Set elements
4574  */
4575
4576 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4577         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
4578         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
4579         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
4580         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
4581         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
4582         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
4583                                             .len = NFT_USERDATA_MAXLEN },
4584         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
4585         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
4586                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
4587         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
4588         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
4589 };
4590
4591 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4592         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
4593                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4594         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
4595                                             .len = NFT_SET_MAXNAMELEN - 1 },
4596         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
4597         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
4598 };
4599
4600 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
4601                                       const struct sk_buff *skb,
4602                                       const struct nlmsghdr *nlh,
4603                                       const struct nlattr * const nla[],
4604                                       struct netlink_ext_ack *extack,
4605                                       u8 genmask)
4606 {
4607         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4608         int family = nfmsg->nfgen_family;
4609         struct nft_table *table;
4610
4611         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
4612                                  genmask);
4613         if (IS_ERR(table)) {
4614                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
4615                 return PTR_ERR(table);
4616         }
4617
4618         nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
4619         return 0;
4620 }
4621
4622 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4623                                   const struct nft_set *set,
4624                                   const struct nft_set_ext *ext)
4625 {
4626         struct nft_set_elem_expr *elem_expr;
4627         u32 size, num_exprs = 0;
4628         struct nft_expr *expr;
4629         struct nlattr *nest;
4630
4631         elem_expr = nft_set_ext_expr(ext);
4632         nft_setelem_expr_foreach(expr, elem_expr, size)
4633                 num_exprs++;
4634
4635         if (num_exprs == 1) {
4636                 expr = nft_setelem_expr_at(elem_expr, 0);
4637                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4638                         return -1;
4639
4640                 return 0;
4641         } else if (num_exprs > 1) {
4642                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4643                 if (nest == NULL)
4644                         goto nla_put_failure;
4645
4646                 nft_setelem_expr_foreach(expr, elem_expr, size) {
4647                         expr = nft_setelem_expr_at(elem_expr, size);
4648                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4649                                 goto nla_put_failure;
4650                 }
4651                 nla_nest_end(skb, nest);
4652         }
4653         return 0;
4654
4655 nla_put_failure:
4656         return -1;
4657 }
4658
4659 static int nf_tables_fill_setelem(struct sk_buff *skb,
4660                                   const struct nft_set *set,
4661                                   const struct nft_set_elem *elem)
4662 {
4663         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4664         unsigned char *b = skb_tail_pointer(skb);
4665         struct nlattr *nest;
4666
4667         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4668         if (nest == NULL)
4669                 goto nla_put_failure;
4670
4671         if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4672                           NFT_DATA_VALUE, set->klen) < 0)
4673                 goto nla_put_failure;
4674
4675         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4676             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4677                           NFT_DATA_VALUE, set->klen) < 0)
4678                 goto nla_put_failure;
4679
4680         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4681             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4682                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4683                           set->dlen) < 0)
4684                 goto nla_put_failure;
4685
4686         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4687             nft_set_elem_expr_dump(skb, set, ext))
4688                 goto nla_put_failure;
4689
4690         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4691             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4692                            (*nft_set_ext_obj(ext))->key.name) < 0)
4693                 goto nla_put_failure;
4694
4695         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4696             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4697                          htonl(*nft_set_ext_flags(ext))))
4698                 goto nla_put_failure;
4699
4700         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4701             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4702                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4703                          NFTA_SET_ELEM_PAD))
4704                 goto nla_put_failure;
4705
4706         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4707                 u64 expires, now = get_jiffies_64();
4708
4709                 expires = *nft_set_ext_expiration(ext);
4710                 if (time_before64(now, expires))
4711                         expires -= now;
4712                 else
4713                         expires = 0;
4714
4715                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4716                                  nf_jiffies64_to_msecs(expires),
4717                                  NFTA_SET_ELEM_PAD))
4718                         goto nla_put_failure;
4719         }
4720
4721         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4722                 struct nft_userdata *udata;
4723
4724                 udata = nft_set_ext_userdata(ext);
4725                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4726                             udata->len + 1, udata->data))
4727                         goto nla_put_failure;
4728         }
4729
4730         nla_nest_end(skb, nest);
4731         return 0;
4732
4733 nla_put_failure:
4734         nlmsg_trim(skb, b);
4735         return -EMSGSIZE;
4736 }
4737
4738 struct nft_set_dump_args {
4739         const struct netlink_callback   *cb;
4740         struct nft_set_iter             iter;
4741         struct sk_buff                  *skb;
4742 };
4743
4744 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4745                                   struct nft_set *set,
4746                                   const struct nft_set_iter *iter,
4747                                   struct nft_set_elem *elem)
4748 {
4749         struct nft_set_dump_args *args;
4750
4751         args = container_of(iter, struct nft_set_dump_args, iter);
4752         return nf_tables_fill_setelem(args->skb, set, elem);
4753 }
4754
4755 struct nft_set_dump_ctx {
4756         const struct nft_set    *set;
4757         struct nft_ctx          ctx;
4758 };
4759
4760 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4761 {
4762         struct nft_set_dump_ctx *dump_ctx = cb->data;
4763         struct net *net = sock_net(skb->sk);
4764         struct nft_table *table;
4765         struct nft_set *set;
4766         struct nft_set_dump_args args;
4767         bool set_found = false;
4768         struct nfgenmsg *nfmsg;
4769         struct nlmsghdr *nlh;
4770         struct nlattr *nest;
4771         u32 portid, seq;
4772         int event;
4773
4774         rcu_read_lock();
4775         list_for_each_entry_rcu(table, &net->nft.tables, list) {
4776                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4777                     dump_ctx->ctx.family != table->family)
4778                         continue;
4779
4780                 if (table != dump_ctx->ctx.table)
4781                         continue;
4782
4783                 list_for_each_entry_rcu(set, &table->sets, list) {
4784                         if (set == dump_ctx->set) {
4785                                 set_found = true;
4786                                 break;
4787                         }
4788                 }
4789                 break;
4790         }
4791
4792         if (!set_found) {
4793                 rcu_read_unlock();
4794                 return -ENOENT;
4795         }
4796
4797         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4798         portid = NETLINK_CB(cb->skb).portid;
4799         seq    = cb->nlh->nlmsg_seq;
4800
4801         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4802                         NLM_F_MULTI);
4803         if (nlh == NULL)
4804                 goto nla_put_failure;
4805
4806         nfmsg = nlmsg_data(nlh);
4807         nfmsg->nfgen_family = table->family;
4808         nfmsg->version      = NFNETLINK_V0;
4809         nfmsg->res_id       = htons(net->nft.base_seq & 0xffff);
4810
4811         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4812                 goto nla_put_failure;
4813         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4814                 goto nla_put_failure;
4815
4816         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4817         if (nest == NULL)
4818                 goto nla_put_failure;
4819
4820         args.cb                 = cb;
4821         args.skb                = skb;
4822         args.iter.genmask       = nft_genmask_cur(net);
4823         args.iter.skip          = cb->args[0];
4824         args.iter.count         = 0;
4825         args.iter.err           = 0;
4826         args.iter.fn            = nf_tables_dump_setelem;
4827         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4828         rcu_read_unlock();
4829
4830         nla_nest_end(skb, nest);
4831         nlmsg_end(skb, nlh);
4832
4833         if (args.iter.err && args.iter.err != -EMSGSIZE)
4834                 return args.iter.err;
4835         if (args.iter.count == cb->args[0])
4836                 return 0;
4837
4838         cb->args[0] = args.iter.count;
4839         return skb->len;
4840
4841 nla_put_failure:
4842         rcu_read_unlock();
4843         return -ENOSPC;
4844 }
4845
4846 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4847 {
4848         struct nft_set_dump_ctx *dump_ctx = cb->data;
4849
4850         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4851
4852         return cb->data ? 0 : -ENOMEM;
4853 }
4854
4855 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4856 {
4857         kfree(cb->data);
4858         return 0;
4859 }
4860
4861 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4862                                        const struct nft_ctx *ctx, u32 seq,
4863                                        u32 portid, int event, u16 flags,
4864                                        const struct nft_set *set,
4865                                        const struct nft_set_elem *elem)
4866 {
4867         struct nfgenmsg *nfmsg;
4868         struct nlmsghdr *nlh;
4869         struct nlattr *nest;
4870         int err;
4871
4872         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4873         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4874                         flags);
4875         if (nlh == NULL)
4876                 goto nla_put_failure;
4877
4878         nfmsg = nlmsg_data(nlh);
4879         nfmsg->nfgen_family     = ctx->family;
4880         nfmsg->version          = NFNETLINK_V0;
4881         nfmsg->res_id           = htons(ctx->net->nft.base_seq & 0xffff);
4882
4883         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4884                 goto nla_put_failure;
4885         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4886                 goto nla_put_failure;
4887
4888         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4889         if (nest == NULL)
4890                 goto nla_put_failure;
4891
4892         err = nf_tables_fill_setelem(skb, set, elem);
4893         if (err < 0)
4894                 goto nla_put_failure;
4895
4896         nla_nest_end(skb, nest);
4897
4898         nlmsg_end(skb, nlh);
4899         return 0;
4900
4901 nla_put_failure:
4902         nlmsg_trim(skb, nlh);
4903         return -1;
4904 }
4905
4906 static int nft_setelem_parse_flags(const struct nft_set *set,
4907                                    const struct nlattr *attr, u32 *flags)
4908 {
4909         if (attr == NULL)
4910                 return 0;
4911
4912         *flags = ntohl(nla_get_be32(attr));
4913         if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4914                 return -EINVAL;
4915         if (!(set->flags & NFT_SET_INTERVAL) &&
4916             *flags & NFT_SET_ELEM_INTERVAL_END)
4917                 return -EINVAL;
4918
4919         return 0;
4920 }
4921
4922 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
4923                                  struct nft_data *key, struct nlattr *attr)
4924 {
4925         struct nft_data_desc desc;
4926         int err;
4927
4928         err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
4929         if (err < 0)
4930                 return err;
4931
4932         if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
4933                 nft_data_release(key, desc.type);
4934                 return -EINVAL;
4935         }
4936
4937         return 0;
4938 }
4939
4940 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
4941                                   struct nft_data_desc *desc,
4942                                   struct nft_data *data,
4943                                   struct nlattr *attr)
4944 {
4945         int err;
4946
4947         err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
4948         if (err < 0)
4949                 return err;
4950
4951         if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
4952                 nft_data_release(data, desc->type);
4953                 return -EINVAL;
4954         }
4955
4956         return 0;
4957 }
4958
4959 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4960                             const struct nlattr *attr)
4961 {
4962         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4963         struct nft_set_elem elem;
4964         struct sk_buff *skb;
4965         uint32_t flags = 0;
4966         void *priv;
4967         int err;
4968
4969         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4970                                           nft_set_elem_policy, NULL);
4971         if (err < 0)
4972                 return err;
4973
4974         if (!nla[NFTA_SET_ELEM_KEY])
4975                 return -EINVAL;
4976
4977         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4978         if (err < 0)
4979                 return err;
4980
4981         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
4982                                     nla[NFTA_SET_ELEM_KEY]);
4983         if (err < 0)
4984                 return err;
4985
4986         if (nla[NFTA_SET_ELEM_KEY_END]) {
4987                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
4988                                             nla[NFTA_SET_ELEM_KEY_END]);
4989                 if (err < 0)
4990                         return err;
4991         }
4992
4993         priv = set->ops->get(ctx->net, set, &elem, flags);
4994         if (IS_ERR(priv))
4995                 return PTR_ERR(priv);
4996
4997         elem.priv = priv;
4998
4999         err = -ENOMEM;
5000         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5001         if (skb == NULL)
5002                 return err;
5003
5004         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5005                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
5006         if (err < 0)
5007                 goto err_fill_setelem;
5008
5009         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5010
5011 err_fill_setelem:
5012         kfree_skb(skb);
5013         return err;
5014 }
5015
5016 /* called with rcu_read_lock held */
5017 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
5018                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5019                                 const struct nlattr * const nla[],
5020                                 struct netlink_ext_ack *extack)
5021 {
5022         u8 genmask = nft_genmask_cur(net);
5023         struct nft_set *set;
5024         struct nlattr *attr;
5025         struct nft_ctx ctx;
5026         int rem, err = 0;
5027
5028         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5029                                          genmask);
5030         if (err < 0)
5031                 return err;
5032
5033         set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5034         if (IS_ERR(set))
5035                 return PTR_ERR(set);
5036
5037         if (nlh->nlmsg_flags & NLM_F_DUMP) {
5038                 struct netlink_dump_control c = {
5039                         .start = nf_tables_dump_set_start,
5040                         .dump = nf_tables_dump_set,
5041                         .done = nf_tables_dump_set_done,
5042                         .module = THIS_MODULE,
5043                 };
5044                 struct nft_set_dump_ctx dump_ctx = {
5045                         .set = set,
5046                         .ctx = ctx,
5047                 };
5048
5049                 c.data = &dump_ctx;
5050                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5051         }
5052
5053         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5054                 return -EINVAL;
5055
5056         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5057                 err = nft_get_set_elem(&ctx, set, attr);
5058                 if (err < 0)
5059                         break;
5060         }
5061
5062         return err;
5063 }
5064
5065 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5066                                      const struct nft_set *set,
5067                                      const struct nft_set_elem *elem,
5068                                      int event, u16 flags)
5069 {
5070         struct net *net = ctx->net;
5071         u32 portid = ctx->portid;
5072         struct sk_buff *skb;
5073         int err;
5074         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
5075                               ctx->table->name, ctx->table->handle,
5076                               set->name, set->handle);
5077
5078         audit_log_nfcfg(buf,
5079                         ctx->family,
5080                         set->handle,
5081                         event == NFT_MSG_NEWSETELEM ?
5082                                 AUDIT_NFT_OP_SETELEM_REGISTER :
5083                                 AUDIT_NFT_OP_SETELEM_UNREGISTER,
5084                         GFP_KERNEL);
5085         kfree(buf);
5086
5087         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5088                 return;
5089
5090         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5091         if (skb == NULL)
5092                 goto err;
5093
5094         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5095                                           set, elem);
5096         if (err < 0) {
5097                 kfree_skb(skb);
5098                 goto err;
5099         }
5100
5101         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
5102         return;
5103 err:
5104         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5105 }
5106
5107 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5108                                               int msg_type,
5109                                               struct nft_set *set)
5110 {
5111         struct nft_trans *trans;
5112
5113         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5114         if (trans == NULL)
5115                 return NULL;
5116
5117         nft_trans_elem_set(trans) = set;
5118         return trans;
5119 }
5120
5121 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5122                                          const struct nft_set *set,
5123                                          const struct nlattr *attr)
5124 {
5125         struct nft_expr *expr;
5126         int err;
5127
5128         expr = nft_expr_init(ctx, attr);
5129         if (IS_ERR(expr))
5130                 return expr;
5131
5132         err = -EOPNOTSUPP;
5133         if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL))
5134                 goto err_set_elem_expr;
5135
5136         if (expr->ops->type->flags & NFT_EXPR_GC) {
5137                 if (set->flags & NFT_SET_TIMEOUT)
5138                         goto err_set_elem_expr;
5139                 if (!set->ops->gc_init)
5140                         goto err_set_elem_expr;
5141                 set->ops->gc_init(set);
5142         }
5143
5144         return expr;
5145
5146 err_set_elem_expr:
5147         nft_expr_destroy(ctx, expr);
5148         return ERR_PTR(err);
5149 }
5150
5151 void *nft_set_elem_init(const struct nft_set *set,
5152                         const struct nft_set_ext_tmpl *tmpl,
5153                         const u32 *key, const u32 *key_end,
5154                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5155 {
5156         struct nft_set_ext *ext;
5157         void *elem;
5158
5159         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5160         if (elem == NULL)
5161                 return NULL;
5162
5163         ext = nft_set_elem_ext(set, elem);
5164         nft_set_ext_init(ext, tmpl);
5165
5166         memcpy(nft_set_ext_key(ext), key, set->klen);
5167         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5168                 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5169         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5170                 memcpy(nft_set_ext_data(ext), data, set->dlen);
5171         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5172                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5173                 if (expiration == 0)
5174                         *nft_set_ext_expiration(ext) += timeout;
5175         }
5176         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5177                 *nft_set_ext_timeout(ext) = timeout;
5178
5179         return elem;
5180 }
5181
5182 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5183                                         struct nft_expr *expr)
5184 {
5185         if (expr->ops->destroy_clone) {
5186                 expr->ops->destroy_clone(ctx, expr);
5187                 module_put(expr->ops->type->owner);
5188         } else {
5189                 nf_tables_expr_destroy(ctx, expr);
5190         }
5191 }
5192
5193 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5194                                       struct nft_set_elem_expr *elem_expr)
5195 {
5196         struct nft_expr *expr;
5197         u32 size;
5198
5199         nft_setelem_expr_foreach(expr, elem_expr, size)
5200                 __nft_set_elem_expr_destroy(ctx, expr);
5201 }
5202
5203 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5204                           bool destroy_expr)
5205 {
5206         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5207         struct nft_ctx ctx = {
5208                 .net    = read_pnet(&set->net),
5209                 .family = set->table->family,
5210         };
5211
5212         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5213         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5214                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5215         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5216                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5217
5218         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5219                 (*nft_set_ext_obj(ext))->use--;
5220         kfree(elem);
5221 }
5222 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5223
5224 /* Only called from commit path, nft_set_elem_deactivate() already deals with
5225  * the refcounting from the preparation phase.
5226  */
5227 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5228                                        const struct nft_set *set, void *elem)
5229 {
5230         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5231
5232         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5233                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5234
5235         kfree(elem);
5236 }
5237
5238 static int nft_set_elem_expr_clone(const struct nft_ctx *ctx,
5239                                    struct nft_set *set,
5240                                    struct nft_expr *expr_array[])
5241 {
5242         struct nft_expr *expr;
5243         int err, i, k;
5244
5245         for (i = 0; i < set->num_exprs; i++) {
5246                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL);
5247                 if (!expr)
5248                         goto err_expr;
5249
5250                 err = nft_expr_clone(expr, set->exprs[i]);
5251                 if (err < 0) {
5252                         nft_expr_destroy(ctx, expr);
5253                         goto err_expr;
5254                 }
5255                 expr_array[i] = expr;
5256         }
5257
5258         return 0;
5259
5260 err_expr:
5261         for (k = i - 1; k >= 0; k--)
5262                 nft_expr_destroy(ctx, expr_array[k]);
5263
5264         return -ENOMEM;
5265 }
5266
5267 static void nft_set_elem_expr_setup(const struct nft_set_ext *ext, int i,
5268                                     struct nft_expr *expr_array[])
5269 {
5270         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5271         struct nft_expr *expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5272
5273         memcpy(expr, expr_array[i], expr_array[i]->ops->size);
5274         elem_expr->size += expr_array[i]->ops->size;
5275         kfree(expr_array[i]);
5276         expr_array[i] = NULL;
5277 }
5278
5279 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5280                             const struct nlattr *attr, u32 nlmsg_flags)
5281 {
5282         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5283         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5284         u8 genmask = nft_genmask_next(ctx->net);
5285         struct nft_set_ext_tmpl tmpl;
5286         struct nft_set_ext *ext, *ext2;
5287         struct nft_set_elem elem;
5288         struct nft_set_binding *binding;
5289         struct nft_object *obj = NULL;
5290         struct nft_userdata *udata;
5291         struct nft_data_desc desc;
5292         enum nft_registers dreg;
5293         struct nft_trans *trans;
5294         u32 flags = 0, size = 0;
5295         u64 timeout;
5296         u64 expiration;
5297         int err, i;
5298         u8 ulen;
5299
5300         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5301                                           nft_set_elem_policy, NULL);
5302         if (err < 0)
5303                 return err;
5304
5305         if (nla[NFTA_SET_ELEM_KEY] == NULL)
5306                 return -EINVAL;
5307
5308         nft_set_ext_prepare(&tmpl);
5309
5310         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5311         if (err < 0)
5312                 return err;
5313         if (flags != 0)
5314                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5315
5316         if (set->flags & NFT_SET_MAP) {
5317                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5318                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5319                         return -EINVAL;
5320         } else {
5321                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5322                         return -EINVAL;
5323         }
5324
5325         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5326              (nla[NFTA_SET_ELEM_DATA] ||
5327               nla[NFTA_SET_ELEM_OBJREF] ||
5328               nla[NFTA_SET_ELEM_TIMEOUT] ||
5329               nla[NFTA_SET_ELEM_EXPIRATION] ||
5330               nla[NFTA_SET_ELEM_USERDATA] ||
5331               nla[NFTA_SET_ELEM_EXPR] ||
5332               nla[NFTA_SET_ELEM_EXPRESSIONS]))
5333                 return -EINVAL;
5334
5335         timeout = 0;
5336         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5337                 if (!(set->flags & NFT_SET_TIMEOUT))
5338                         return -EINVAL;
5339                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5340                                             &timeout);
5341                 if (err)
5342                         return err;
5343         } else if (set->flags & NFT_SET_TIMEOUT) {
5344                 timeout = set->timeout;
5345         }
5346
5347         expiration = 0;
5348         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5349                 if (!(set->flags & NFT_SET_TIMEOUT))
5350                         return -EINVAL;
5351                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5352                                             &expiration);
5353                 if (err)
5354                         return err;
5355         }
5356
5357         if (nla[NFTA_SET_ELEM_EXPR]) {
5358                 struct nft_expr *expr;
5359
5360                 if (set->num_exprs != 1)
5361                         return -EOPNOTSUPP;
5362
5363                 expr = nft_set_elem_expr_alloc(ctx, set,
5364                                                nla[NFTA_SET_ELEM_EXPR]);
5365                 if (IS_ERR(expr))
5366                         return PTR_ERR(expr);
5367
5368                 expr_array[0] = expr;
5369
5370                 if (set->exprs[0] && set->exprs[0]->ops != expr->ops) {
5371                         err = -EOPNOTSUPP;
5372                         goto err_set_elem_expr;
5373                 }
5374         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5375                 struct nft_expr *expr;
5376                 struct nlattr *tmp;
5377                 int left;
5378
5379                 if (set->num_exprs == 0)
5380                         return -EOPNOTSUPP;
5381
5382                 i = 0;
5383                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
5384                         if (i == set->num_exprs) {
5385                                 err = -E2BIG;
5386                                 goto err_set_elem_expr;
5387                         }
5388                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
5389                                 err = -EINVAL;
5390                                 goto err_set_elem_expr;
5391                         }
5392                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5393                         if (IS_ERR(expr)) {
5394                                 err = PTR_ERR(expr);
5395                                 goto err_set_elem_expr;
5396                         }
5397                         expr_array[i] = expr;
5398
5399                         if (expr->ops != set->exprs[i]->ops) {
5400                                 err = -EOPNOTSUPP;
5401                                 goto err_set_elem_expr;
5402                         }
5403                         i++;
5404                 }
5405                 if (set->num_exprs != i) {
5406                         err = -EOPNOTSUPP;
5407                         goto err_set_elem_expr;
5408                 }
5409         } else if (set->num_exprs > 0) {
5410                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5411                 if (err < 0)
5412                         goto err_set_elem_expr_clone;
5413         }
5414
5415         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5416                                     nla[NFTA_SET_ELEM_KEY]);
5417         if (err < 0)
5418                 goto err_set_elem_expr;
5419
5420         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5421
5422         if (nla[NFTA_SET_ELEM_KEY_END]) {
5423                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5424                                             nla[NFTA_SET_ELEM_KEY_END]);
5425                 if (err < 0)
5426                         goto err_parse_key;
5427
5428                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5429         }
5430
5431         if (timeout > 0) {
5432                 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5433                 if (timeout != set->timeout)
5434                         nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5435         }
5436
5437         if (set->num_exprs) {
5438                 for (i = 0; i < set->num_exprs; i++)
5439                         size += expr_array[i]->ops->size;
5440
5441                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
5442                                        sizeof(struct nft_set_elem_expr) +
5443                                        size);
5444         }
5445
5446         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5447                 if (!(set->flags & NFT_SET_OBJECT)) {
5448                         err = -EINVAL;
5449                         goto err_parse_key_end;
5450                 }
5451                 obj = nft_obj_lookup(ctx->net, ctx->table,
5452                                      nla[NFTA_SET_ELEM_OBJREF],
5453                                      set->objtype, genmask);
5454                 if (IS_ERR(obj)) {
5455                         err = PTR_ERR(obj);
5456                         goto err_parse_key_end;
5457                 }
5458                 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5459         }
5460
5461         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5462                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5463                                              nla[NFTA_SET_ELEM_DATA]);
5464                 if (err < 0)
5465                         goto err_parse_key_end;
5466
5467                 dreg = nft_type_to_reg(set->dtype);
5468                 list_for_each_entry(binding, &set->bindings, list) {
5469                         struct nft_ctx bind_ctx = {
5470                                 .net    = ctx->net,
5471                                 .family = ctx->family,
5472                                 .table  = ctx->table,
5473                                 .chain  = (struct nft_chain *)binding->chain,
5474                         };
5475
5476                         if (!(binding->flags & NFT_SET_MAP))
5477                                 continue;
5478
5479                         err = nft_validate_register_store(&bind_ctx, dreg,
5480                                                           &elem.data.val,
5481                                                           desc.type, desc.len);
5482                         if (err < 0)
5483                                 goto err_parse_data;
5484
5485                         if (desc.type == NFT_DATA_VERDICT &&
5486                             (elem.data.val.verdict.code == NFT_GOTO ||
5487                              elem.data.val.verdict.code == NFT_JUMP))
5488                                 nft_validate_state_update(ctx->net,
5489                                                           NFT_VALIDATE_NEED);
5490                 }
5491
5492                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
5493         }
5494
5495         /* The full maximum length of userdata can exceed the maximum
5496          * offset value (U8_MAX) for following extensions, therefor it
5497          * must be the last extension added.
5498          */
5499         ulen = 0;
5500         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5501                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5502                 if (ulen > 0)
5503                         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5504                                                ulen);
5505         }
5506
5507         err = -ENOMEM;
5508         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5509                                       elem.key_end.val.data, elem.data.val.data,
5510                                       timeout, expiration, GFP_KERNEL);
5511         if (elem.priv == NULL)
5512                 goto err_parse_data;
5513
5514         ext = nft_set_elem_ext(set, elem.priv);
5515         if (flags)
5516                 *nft_set_ext_flags(ext) = flags;
5517         if (ulen > 0) {
5518                 udata = nft_set_ext_userdata(ext);
5519                 udata->len = ulen - 1;
5520                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5521         }
5522         if (obj) {
5523                 *nft_set_ext_obj(ext) = obj;
5524                 obj->use++;
5525         }
5526         for (i = 0; i < set->num_exprs; i++)
5527                 nft_set_elem_expr_setup(ext, i, expr_array);
5528
5529         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5530         if (trans == NULL)
5531                 goto err_trans;
5532
5533         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
5534         err = set->ops->insert(ctx->net, set, &elem, &ext2);
5535         if (err) {
5536                 if (err == -EEXIST) {
5537                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5538                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5539                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
5540                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
5541                                 goto err_element_clash;
5542                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5543                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5544                              memcmp(nft_set_ext_data(ext),
5545                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
5546                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5547                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5548                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
5549                                 goto err_element_clash;
5550                         else if (!(nlmsg_flags & NLM_F_EXCL))
5551                                 err = 0;
5552                 } else if (err == -ENOTEMPTY) {
5553                         /* ENOTEMPTY reports overlapping between this element
5554                          * and an existing one.
5555                          */
5556                         err = -EEXIST;
5557                 }
5558                 goto err_element_clash;
5559         }
5560
5561         if (set->size &&
5562             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5563                 err = -ENFILE;
5564                 goto err_set_full;
5565         }
5566
5567         nft_trans_elem(trans) = elem;
5568         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5569         return 0;
5570
5571 err_set_full:
5572         set->ops->remove(ctx->net, set, &elem);
5573 err_element_clash:
5574         kfree(trans);
5575 err_trans:
5576         if (obj)
5577                 obj->use--;
5578
5579         nf_tables_set_elem_destroy(ctx, set, elem.priv);
5580 err_parse_data:
5581         if (nla[NFTA_SET_ELEM_DATA] != NULL)
5582                 nft_data_release(&elem.data.val, desc.type);
5583 err_parse_key_end:
5584         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
5585 err_parse_key:
5586         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5587 err_set_elem_expr:
5588         for (i = 0; i < set->num_exprs && expr_array[i]; i++)
5589                 nft_expr_destroy(ctx, expr_array[i]);
5590 err_set_elem_expr_clone:
5591         return err;
5592 }
5593
5594 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
5595                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5596                                 const struct nlattr * const nla[],
5597                                 struct netlink_ext_ack *extack)
5598 {
5599         u8 genmask = nft_genmask_next(net);
5600         const struct nlattr *attr;
5601         struct nft_set *set;
5602         struct nft_ctx ctx;
5603         int rem, err;
5604
5605         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
5606                 return -EINVAL;
5607
5608         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5609                                          genmask);
5610         if (err < 0)
5611                 return err;
5612
5613         set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
5614                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
5615         if (IS_ERR(set))
5616                 return PTR_ERR(set);
5617
5618         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5619                 return -EBUSY;
5620
5621         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5622                 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
5623                 if (err < 0)
5624                         return err;
5625         }
5626
5627         if (net->nft.validate_state == NFT_VALIDATE_DO)
5628                 return nft_table_validate(net, ctx.table);
5629
5630         return 0;
5631 }
5632
5633 /**
5634  *      nft_data_hold - hold a nft_data item
5635  *
5636  *      @data: struct nft_data to release
5637  *      @type: type of data
5638  *
5639  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5640  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
5641  *      NFT_GOTO verdicts. This function must be called on active data objects
5642  *      from the second phase of the commit protocol.
5643  */
5644 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
5645 {
5646         struct nft_chain *chain;
5647         struct nft_rule *rule;
5648
5649         if (type == NFT_DATA_VERDICT) {
5650                 switch (data->verdict.code) {
5651                 case NFT_JUMP:
5652                 case NFT_GOTO:
5653                         chain = data->verdict.chain;
5654                         chain->use++;
5655
5656                         if (!nft_chain_is_bound(chain))
5657                                 break;
5658
5659                         chain->table->use++;
5660                         list_for_each_entry(rule, &chain->rules, list)
5661                                 chain->use++;
5662
5663                         nft_chain_add(chain->table, chain);
5664                         break;
5665                 }
5666         }
5667 }
5668
5669 static void nft_set_elem_activate(const struct net *net,
5670                                   const struct nft_set *set,
5671                                   struct nft_set_elem *elem)
5672 {
5673         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5674
5675         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5676                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
5677         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5678                 (*nft_set_ext_obj(ext))->use++;
5679 }
5680
5681 static void nft_set_elem_deactivate(const struct net *net,
5682                                     const struct nft_set *set,
5683                                     struct nft_set_elem *elem)
5684 {
5685         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5686
5687         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5688                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5689         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5690                 (*nft_set_ext_obj(ext))->use--;
5691 }
5692
5693 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
5694                            const struct nlattr *attr)
5695 {
5696         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5697         struct nft_set_ext_tmpl tmpl;
5698         struct nft_set_elem elem;
5699         struct nft_set_ext *ext;
5700         struct nft_trans *trans;
5701         u32 flags = 0;
5702         void *priv;
5703         int err;
5704
5705         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5706                                           nft_set_elem_policy, NULL);
5707         if (err < 0)
5708                 return err;
5709
5710         if (nla[NFTA_SET_ELEM_KEY] == NULL)
5711                 return -EINVAL;
5712
5713         nft_set_ext_prepare(&tmpl);
5714
5715         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5716         if (err < 0)
5717                 return err;
5718         if (flags != 0)
5719                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5720
5721         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5722                                     nla[NFTA_SET_ELEM_KEY]);
5723         if (err < 0)
5724                 return err;
5725
5726         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5727
5728         if (nla[NFTA_SET_ELEM_KEY_END]) {
5729                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5730                                             nla[NFTA_SET_ELEM_KEY_END]);
5731                 if (err < 0)
5732                         return err;
5733
5734                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5735         }
5736
5737         err = -ENOMEM;
5738         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5739                                       elem.key_end.val.data, NULL, 0, 0,
5740                                       GFP_KERNEL);
5741         if (elem.priv == NULL)
5742                 goto fail_elem;
5743
5744         ext = nft_set_elem_ext(set, elem.priv);
5745         if (flags)
5746                 *nft_set_ext_flags(ext) = flags;
5747
5748         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
5749         if (trans == NULL)
5750                 goto fail_trans;
5751
5752         priv = set->ops->deactivate(ctx->net, set, &elem);
5753         if (priv == NULL) {
5754                 err = -ENOENT;
5755                 goto fail_ops;
5756         }
5757         kfree(elem.priv);
5758         elem.priv = priv;
5759
5760         nft_set_elem_deactivate(ctx->net, set, &elem);
5761
5762         nft_trans_elem(trans) = elem;
5763         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5764         return 0;
5765
5766 fail_ops:
5767         kfree(trans);
5768 fail_trans:
5769         kfree(elem.priv);
5770 fail_elem:
5771         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5772         return err;
5773 }
5774
5775 static int nft_flush_set(const struct nft_ctx *ctx,
5776                          struct nft_set *set,
5777                          const struct nft_set_iter *iter,
5778                          struct nft_set_elem *elem)
5779 {
5780         struct nft_trans *trans;
5781         int err;
5782
5783         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
5784                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
5785         if (!trans)
5786                 return -ENOMEM;
5787
5788         if (!set->ops->flush(ctx->net, set, elem->priv)) {
5789                 err = -ENOENT;
5790                 goto err1;
5791         }
5792         set->ndeact++;
5793
5794         nft_set_elem_deactivate(ctx->net, set, elem);
5795         nft_trans_elem_set(trans) = set;
5796         nft_trans_elem(trans) = *elem;
5797         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5798
5799         return 0;
5800 err1:
5801         kfree(trans);
5802         return err;
5803 }
5804
5805 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
5806                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5807                                 const struct nlattr * const nla[],
5808                                 struct netlink_ext_ack *extack)
5809 {
5810         u8 genmask = nft_genmask_next(net);
5811         const struct nlattr *attr;
5812         struct nft_set *set;
5813         struct nft_ctx ctx;
5814         int rem, err = 0;
5815
5816         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5817                                          genmask);
5818         if (err < 0)
5819                 return err;
5820
5821         set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5822         if (IS_ERR(set))
5823                 return PTR_ERR(set);
5824         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5825                 return -EBUSY;
5826
5827         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
5828                 struct nft_set_iter iter = {
5829                         .genmask        = genmask,
5830                         .fn             = nft_flush_set,
5831                 };
5832                 set->ops->walk(&ctx, set, &iter);
5833
5834                 return iter.err;
5835         }
5836
5837         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5838                 err = nft_del_setelem(&ctx, set, attr);
5839                 if (err < 0)
5840                         break;
5841
5842                 set->ndeact++;
5843         }
5844         return err;
5845 }
5846
5847 void nft_set_gc_batch_release(struct rcu_head *rcu)
5848 {
5849         struct nft_set_gc_batch *gcb;
5850         unsigned int i;
5851
5852         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
5853         for (i = 0; i < gcb->head.cnt; i++)
5854                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
5855         kfree(gcb);
5856 }
5857
5858 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
5859                                                 gfp_t gfp)
5860 {
5861         struct nft_set_gc_batch *gcb;
5862
5863         gcb = kzalloc(sizeof(*gcb), gfp);
5864         if (gcb == NULL)
5865                 return gcb;
5866         gcb->head.set = set;
5867         return gcb;
5868 }
5869
5870 /*
5871  * Stateful objects
5872  */
5873
5874 /**
5875  *      nft_register_obj- register nf_tables stateful object type
5876  *      @obj_type: object type
5877  *
5878  *      Registers the object type for use with nf_tables. Returns zero on
5879  *      success or a negative errno code otherwise.
5880  */
5881 int nft_register_obj(struct nft_object_type *obj_type)
5882 {
5883         if (obj_type->type == NFT_OBJECT_UNSPEC)
5884                 return -EINVAL;
5885
5886         nfnl_lock(NFNL_SUBSYS_NFTABLES);
5887         list_add_rcu(&obj_type->list, &nf_tables_objects);
5888         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5889         return 0;
5890 }
5891 EXPORT_SYMBOL_GPL(nft_register_obj);
5892
5893 /**
5894  *      nft_unregister_obj - unregister nf_tables object type
5895  *      @obj_type: object type
5896  *
5897  *      Unregisters the object type for use with nf_tables.
5898  */
5899 void nft_unregister_obj(struct nft_object_type *obj_type)
5900 {
5901         nfnl_lock(NFNL_SUBSYS_NFTABLES);
5902         list_del_rcu(&obj_type->list);
5903         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5904 }
5905 EXPORT_SYMBOL_GPL(nft_unregister_obj);
5906
5907 struct nft_object *nft_obj_lookup(const struct net *net,
5908                                   const struct nft_table *table,
5909                                   const struct nlattr *nla, u32 objtype,
5910                                   u8 genmask)
5911 {
5912         struct nft_object_hash_key k = { .table = table };
5913         char search[NFT_OBJ_MAXNAMELEN];
5914         struct rhlist_head *tmp, *list;
5915         struct nft_object *obj;
5916
5917         nla_strscpy(search, nla, sizeof(search));
5918         k.name = search;
5919
5920         WARN_ON_ONCE(!rcu_read_lock_held() &&
5921                      !lockdep_commit_lock_is_held(net));
5922
5923         rcu_read_lock();
5924         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
5925         if (!list)
5926                 goto out;
5927
5928         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
5929                 if (objtype == obj->ops->type->type &&
5930                     nft_active_genmask(obj, genmask)) {
5931                         rcu_read_unlock();
5932                         return obj;
5933                 }
5934         }
5935 out:
5936         rcu_read_unlock();
5937         return ERR_PTR(-ENOENT);
5938 }
5939 EXPORT_SYMBOL_GPL(nft_obj_lookup);
5940
5941 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
5942                                                   const struct nlattr *nla,
5943                                                   u32 objtype, u8 genmask)
5944 {
5945         struct nft_object *obj;
5946
5947         list_for_each_entry(obj, &table->objects, list) {
5948                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
5949                     objtype == obj->ops->type->type &&
5950                     nft_active_genmask(obj, genmask))
5951                         return obj;
5952         }
5953         return ERR_PTR(-ENOENT);
5954 }
5955
5956 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
5957         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
5958                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
5959         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
5960                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
5961         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
5962         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
5963         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
5964         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
5965                                     .len = NFT_USERDATA_MAXLEN },
5966 };
5967
5968 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
5969                                        const struct nft_object_type *type,
5970                                        const struct nlattr *attr)
5971 {
5972         struct nlattr **tb;
5973         const struct nft_object_ops *ops;
5974         struct nft_object *obj;
5975         int err = -ENOMEM;
5976
5977         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
5978         if (!tb)
5979                 goto err1;
5980
5981         if (attr) {
5982                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
5983                                                   type->policy, NULL);
5984                 if (err < 0)
5985                         goto err2;
5986         } else {
5987                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
5988         }
5989
5990         if (type->select_ops) {
5991                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
5992                 if (IS_ERR(ops)) {
5993                         err = PTR_ERR(ops);
5994                         goto err2;
5995                 }
5996         } else {
5997                 ops = type->ops;
5998         }
5999
6000         err = -ENOMEM;
6001         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
6002         if (!obj)
6003                 goto err2;
6004
6005         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6006         if (err < 0)
6007                 goto err3;
6008
6009         obj->ops = ops;
6010
6011         kfree(tb);
6012         return obj;
6013 err3:
6014         kfree(obj);
6015 err2:
6016         kfree(tb);
6017 err1:
6018         return ERR_PTR(err);
6019 }
6020
6021 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6022                            struct nft_object *obj, bool reset)
6023 {
6024         struct nlattr *nest;
6025
6026         nest = nla_nest_start_noflag(skb, attr);
6027         if (!nest)
6028                 goto nla_put_failure;
6029         if (obj->ops->dump(skb, obj, reset) < 0)
6030                 goto nla_put_failure;
6031         nla_nest_end(skb, nest);
6032         return 0;
6033
6034 nla_put_failure:
6035         return -1;
6036 }
6037
6038 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6039 {
6040         const struct nft_object_type *type;
6041
6042         list_for_each_entry(type, &nf_tables_objects, list) {
6043                 if (objtype == type->type)
6044                         return type;
6045         }
6046         return NULL;
6047 }
6048
6049 static const struct nft_object_type *
6050 nft_obj_type_get(struct net *net, u32 objtype)
6051 {
6052         const struct nft_object_type *type;
6053
6054         type = __nft_obj_type_get(objtype);
6055         if (type != NULL && try_module_get(type->owner))
6056                 return type;
6057
6058         lockdep_nfnl_nft_mutex_not_held();
6059 #ifdef CONFIG_MODULES
6060         if (type == NULL) {
6061                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6062                         return ERR_PTR(-EAGAIN);
6063         }
6064 #endif
6065         return ERR_PTR(-ENOENT);
6066 }
6067
6068 static int nf_tables_updobj(const struct nft_ctx *ctx,
6069                             const struct nft_object_type *type,
6070                             const struct nlattr *attr,
6071                             struct nft_object *obj)
6072 {
6073         struct nft_object *newobj;
6074         struct nft_trans *trans;
6075         int err;
6076
6077         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6078                                 sizeof(struct nft_trans_obj));
6079         if (!trans)
6080                 return -ENOMEM;
6081
6082         newobj = nft_obj_init(ctx, type, attr);
6083         if (IS_ERR(newobj)) {
6084                 err = PTR_ERR(newobj);
6085                 goto err_free_trans;
6086         }
6087
6088         nft_trans_obj(trans) = obj;
6089         nft_trans_obj_update(trans) = true;
6090         nft_trans_obj_newobj(trans) = newobj;
6091         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6092
6093         return 0;
6094
6095 err_free_trans:
6096         kfree(trans);
6097         return err;
6098 }
6099
6100 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
6101                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6102                             const struct nlattr * const nla[],
6103                             struct netlink_ext_ack *extack)
6104 {
6105         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6106         const struct nft_object_type *type;
6107         u8 genmask = nft_genmask_next(net);
6108         int family = nfmsg->nfgen_family;
6109         struct nft_table *table;
6110         struct nft_object *obj;
6111         struct nft_ctx ctx;
6112         u32 objtype;
6113         int err;
6114
6115         if (!nla[NFTA_OBJ_TYPE] ||
6116             !nla[NFTA_OBJ_NAME] ||
6117             !nla[NFTA_OBJ_DATA])
6118                 return -EINVAL;
6119
6120         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
6121         if (IS_ERR(table)) {
6122                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6123                 return PTR_ERR(table);
6124         }
6125
6126         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6127         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6128         if (IS_ERR(obj)) {
6129                 err = PTR_ERR(obj);
6130                 if (err != -ENOENT) {
6131                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6132                         return err;
6133                 }
6134         } else {
6135                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6136                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6137                         return -EEXIST;
6138                 }
6139                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
6140                         return -EOPNOTSUPP;
6141
6142                 type = __nft_obj_type_get(objtype);
6143                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6144
6145                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6146         }
6147
6148         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6149
6150         type = nft_obj_type_get(net, objtype);
6151         if (IS_ERR(type))
6152                 return PTR_ERR(type);
6153
6154         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6155         if (IS_ERR(obj)) {
6156                 err = PTR_ERR(obj);
6157                 goto err_init;
6158         }
6159         obj->key.table = table;
6160         obj->handle = nf_tables_alloc_handle(table);
6161
6162         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
6163         if (!obj->key.name) {
6164                 err = -ENOMEM;
6165                 goto err_strdup;
6166         }
6167
6168         if (nla[NFTA_OBJ_USERDATA]) {
6169                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6170                 if (obj->udata == NULL)
6171                         goto err_userdata;
6172
6173                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6174         }
6175
6176         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6177         if (err < 0)
6178                 goto err_trans;
6179
6180         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6181                               nft_objname_ht_params);
6182         if (err < 0)
6183                 goto err_obj_ht;
6184
6185         list_add_tail_rcu(&obj->list, &table->objects);
6186         table->use++;
6187         return 0;
6188 err_obj_ht:
6189         /* queued in transaction log */
6190         INIT_LIST_HEAD(&obj->list);
6191         return err;
6192 err_trans:
6193         kfree(obj->key.name);
6194 err_userdata:
6195         kfree(obj->udata);
6196 err_strdup:
6197         if (obj->ops->destroy)
6198                 obj->ops->destroy(&ctx, obj);
6199         kfree(obj);
6200 err_init:
6201         module_put(type->owner);
6202         return err;
6203 }
6204
6205 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6206                                    u32 portid, u32 seq, int event, u32 flags,
6207                                    int family, const struct nft_table *table,
6208                                    struct nft_object *obj, bool reset)
6209 {
6210         struct nfgenmsg *nfmsg;
6211         struct nlmsghdr *nlh;
6212
6213         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6214         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
6215         if (nlh == NULL)
6216                 goto nla_put_failure;
6217
6218         nfmsg = nlmsg_data(nlh);
6219         nfmsg->nfgen_family     = family;
6220         nfmsg->version          = NFNETLINK_V0;
6221         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
6222
6223         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6224             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6225             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6226             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6227             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6228             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6229                          NFTA_OBJ_PAD))
6230                 goto nla_put_failure;
6231
6232         if (obj->udata &&
6233             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6234                 goto nla_put_failure;
6235
6236         nlmsg_end(skb, nlh);
6237         return 0;
6238
6239 nla_put_failure:
6240         nlmsg_trim(skb, nlh);
6241         return -1;
6242 }
6243
6244 struct nft_obj_filter {
6245         char            *table;
6246         u32             type;
6247 };
6248
6249 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6250 {
6251         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6252         const struct nft_table *table;
6253         unsigned int idx = 0, s_idx = cb->args[0];
6254         struct nft_obj_filter *filter = cb->data;
6255         struct net *net = sock_net(skb->sk);
6256         int family = nfmsg->nfgen_family;
6257         struct nft_object *obj;
6258         bool reset = false;
6259
6260         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6261                 reset = true;
6262
6263         rcu_read_lock();
6264         cb->seq = net->nft.base_seq;
6265
6266         list_for_each_entry_rcu(table, &net->nft.tables, list) {
6267                 if (family != NFPROTO_UNSPEC && family != table->family)
6268                         continue;
6269
6270                 list_for_each_entry_rcu(obj, &table->objects, list) {
6271                         if (!nft_is_active(net, obj))
6272                                 goto cont;
6273                         if (idx < s_idx)
6274                                 goto cont;
6275                         if (idx > s_idx)
6276                                 memset(&cb->args[1], 0,
6277                                        sizeof(cb->args) - sizeof(cb->args[0]));
6278                         if (filter && filter->table &&
6279                             strcmp(filter->table, table->name))
6280                                 goto cont;
6281                         if (filter &&
6282                             filter->type != NFT_OBJECT_UNSPEC &&
6283                             obj->ops->type->type != filter->type)
6284                                 goto cont;
6285
6286                         if (reset) {
6287                                 char *buf = kasprintf(GFP_ATOMIC,
6288                                                       "%s:%llu;?:0",
6289                                                       table->name,
6290                                                       table->handle);
6291
6292                                 audit_log_nfcfg(buf,
6293                                                 family,
6294                                                 obj->handle,
6295                                                 AUDIT_NFT_OP_OBJ_RESET,
6296                                                 GFP_ATOMIC);
6297                                 kfree(buf);
6298                         }
6299
6300                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6301                                                     cb->nlh->nlmsg_seq,
6302                                                     NFT_MSG_NEWOBJ,
6303                                                     NLM_F_MULTI | NLM_F_APPEND,
6304                                                     table->family, table,
6305                                                     obj, reset) < 0)
6306                                 goto done;
6307
6308                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6309 cont:
6310                         idx++;
6311                 }
6312         }
6313 done:
6314         rcu_read_unlock();
6315
6316         cb->args[0] = idx;
6317         return skb->len;
6318 }
6319
6320 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6321 {
6322         const struct nlattr * const *nla = cb->data;
6323         struct nft_obj_filter *filter = NULL;
6324
6325         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6326                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6327                 if (!filter)
6328                         return -ENOMEM;
6329
6330                 if (nla[NFTA_OBJ_TABLE]) {
6331                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6332                         if (!filter->table) {
6333                                 kfree(filter);
6334                                 return -ENOMEM;
6335                         }
6336                 }
6337
6338                 if (nla[NFTA_OBJ_TYPE])
6339                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6340         }
6341
6342         cb->data = filter;
6343         return 0;
6344 }
6345
6346 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6347 {
6348         struct nft_obj_filter *filter = cb->data;
6349
6350         if (filter) {
6351                 kfree(filter->table);
6352                 kfree(filter);
6353         }
6354
6355         return 0;
6356 }
6357
6358 /* called with rcu_read_lock held */
6359 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
6360                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6361                             const struct nlattr * const nla[],
6362                             struct netlink_ext_ack *extack)
6363 {
6364         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6365         u8 genmask = nft_genmask_cur(net);
6366         int family = nfmsg->nfgen_family;
6367         const struct nft_table *table;
6368         struct nft_object *obj;
6369         struct sk_buff *skb2;
6370         bool reset = false;
6371         u32 objtype;
6372         int err;
6373
6374         if (nlh->nlmsg_flags & NLM_F_DUMP) {
6375                 struct netlink_dump_control c = {
6376                         .start = nf_tables_dump_obj_start,
6377                         .dump = nf_tables_dump_obj,
6378                         .done = nf_tables_dump_obj_done,
6379                         .module = THIS_MODULE,
6380                         .data = (void *)nla,
6381                 };
6382
6383                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
6384         }
6385
6386         if (!nla[NFTA_OBJ_NAME] ||
6387             !nla[NFTA_OBJ_TYPE])
6388                 return -EINVAL;
6389
6390         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
6391         if (IS_ERR(table)) {
6392                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6393                 return PTR_ERR(table);
6394         }
6395
6396         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6397         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6398         if (IS_ERR(obj)) {
6399                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6400                 return PTR_ERR(obj);
6401         }
6402
6403         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6404         if (!skb2)
6405                 return -ENOMEM;
6406
6407         if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6408                 reset = true;
6409
6410         if (reset) {
6411                 char *buf = kasprintf(GFP_ATOMIC, "%s:%llu;?:0",
6412                                       table->name, table->handle);
6413
6414                 audit_log_nfcfg(buf,
6415                                 family,
6416                                 obj->handle,
6417                                 AUDIT_NFT_OP_OBJ_RESET,
6418                                 GFP_ATOMIC);
6419                 kfree(buf);
6420         }
6421
6422         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6423                                       nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
6424                                       family, table, obj, reset);
6425         if (err < 0)
6426                 goto err_fill_obj_info;
6427
6428         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6429
6430 err_fill_obj_info:
6431         kfree_skb(skb2);
6432         return err;
6433 }
6434
6435 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
6436 {
6437         if (obj->ops->destroy)
6438                 obj->ops->destroy(ctx, obj);
6439
6440         module_put(obj->ops->type->owner);
6441         kfree(obj->key.name);
6442         kfree(obj->udata);
6443         kfree(obj);
6444 }
6445
6446 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
6447                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6448                             const struct nlattr * const nla[],
6449                             struct netlink_ext_ack *extack)
6450 {
6451         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6452         u8 genmask = nft_genmask_next(net);
6453         int family = nfmsg->nfgen_family;
6454         const struct nlattr *attr;
6455         struct nft_table *table;
6456         struct nft_object *obj;
6457         struct nft_ctx ctx;
6458         u32 objtype;
6459
6460         if (!nla[NFTA_OBJ_TYPE] ||
6461             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
6462                 return -EINVAL;
6463
6464         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
6465         if (IS_ERR(table)) {
6466                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6467                 return PTR_ERR(table);
6468         }
6469
6470         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6471         if (nla[NFTA_OBJ_HANDLE]) {
6472                 attr = nla[NFTA_OBJ_HANDLE];
6473                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
6474         } else {
6475                 attr = nla[NFTA_OBJ_NAME];
6476                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
6477         }
6478
6479         if (IS_ERR(obj)) {
6480                 NL_SET_BAD_ATTR(extack, attr);
6481                 return PTR_ERR(obj);
6482         }
6483         if (obj->use > 0) {
6484                 NL_SET_BAD_ATTR(extack, attr);
6485                 return -EBUSY;
6486         }
6487
6488         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6489
6490         return nft_delobj(&ctx, obj);
6491 }
6492
6493 void nft_obj_notify(struct net *net, const struct nft_table *table,
6494                     struct nft_object *obj, u32 portid, u32 seq, int event,
6495                     int family, int report, gfp_t gfp)
6496 {
6497         struct sk_buff *skb;
6498         int err;
6499         char *buf = kasprintf(gfp, "%s:%llu;?:0",
6500                               table->name, table->handle);
6501
6502         audit_log_nfcfg(buf,
6503                         family,
6504                         obj->handle,
6505                         event == NFT_MSG_NEWOBJ ?
6506                                 AUDIT_NFT_OP_OBJ_REGISTER :
6507                                 AUDIT_NFT_OP_OBJ_UNREGISTER,
6508                         gfp);
6509         kfree(buf);
6510
6511         if (!report &&
6512             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6513                 return;
6514
6515         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
6516         if (skb == NULL)
6517                 goto err;
6518
6519         err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
6520                                       table, obj, false);
6521         if (err < 0) {
6522                 kfree_skb(skb);
6523                 goto err;
6524         }
6525
6526         nft_notify_enqueue(skb, report, &net->nft.notify_list);
6527         return;
6528 err:
6529         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6530 }
6531 EXPORT_SYMBOL_GPL(nft_obj_notify);
6532
6533 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
6534                                  struct nft_object *obj, int event)
6535 {
6536         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
6537                        ctx->family, ctx->report, GFP_KERNEL);
6538 }
6539
6540 /*
6541  * Flow tables
6542  */
6543 void nft_register_flowtable_type(struct nf_flowtable_type *type)
6544 {
6545         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6546         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
6547         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6548 }
6549 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
6550
6551 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
6552 {
6553         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6554         list_del_rcu(&type->list);
6555         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6556 }
6557 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
6558
6559 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
6560         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
6561                                             .len = NFT_NAME_MAXLEN - 1 },
6562         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
6563                                             .len = NFT_NAME_MAXLEN - 1 },
6564         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
6565         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
6566         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
6567 };
6568
6569 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
6570                                            const struct nlattr *nla, u8 genmask)
6571 {
6572         struct nft_flowtable *flowtable;
6573
6574         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6575                 if (!nla_strcmp(nla, flowtable->name) &&
6576                     nft_active_genmask(flowtable, genmask))
6577                         return flowtable;
6578         }
6579         return ERR_PTR(-ENOENT);
6580 }
6581 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
6582
6583 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
6584                                     struct nft_flowtable *flowtable,
6585                                     enum nft_trans_phase phase)
6586 {
6587         switch (phase) {
6588         case NFT_TRANS_PREPARE:
6589         case NFT_TRANS_ABORT:
6590         case NFT_TRANS_RELEASE:
6591                 flowtable->use--;
6592                 fallthrough;
6593         default:
6594                 return;
6595         }
6596 }
6597 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
6598
6599 static struct nft_flowtable *
6600 nft_flowtable_lookup_byhandle(const struct nft_table *table,
6601                               const struct nlattr *nla, u8 genmask)
6602 {
6603        struct nft_flowtable *flowtable;
6604
6605        list_for_each_entry(flowtable, &table->flowtables, list) {
6606                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
6607                    nft_active_genmask(flowtable, genmask))
6608                        return flowtable;
6609        }
6610        return ERR_PTR(-ENOENT);
6611 }
6612
6613 struct nft_flowtable_hook {
6614         u32                     num;
6615         int                     priority;
6616         struct list_head        list;
6617 };
6618
6619 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
6620         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
6621         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
6622         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
6623 };
6624
6625 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
6626                                     const struct nlattr *attr,
6627                                     struct nft_flowtable_hook *flowtable_hook,
6628                                     struct nft_flowtable *flowtable, bool add)
6629 {
6630         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
6631         struct nft_hook *hook;
6632         int hooknum, priority;
6633         int err;
6634
6635         INIT_LIST_HEAD(&flowtable_hook->list);
6636
6637         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
6638                                           nft_flowtable_hook_policy, NULL);
6639         if (err < 0)
6640                 return err;
6641
6642         if (add) {
6643                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
6644                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
6645                         return -EINVAL;
6646
6647                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6648                 if (hooknum != NF_NETDEV_INGRESS)
6649                         return -EOPNOTSUPP;
6650
6651                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6652
6653                 flowtable_hook->priority        = priority;
6654                 flowtable_hook->num             = hooknum;
6655         } else {
6656                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
6657                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6658                         if (hooknum != flowtable->hooknum)
6659                                 return -EOPNOTSUPP;
6660                 }
6661
6662                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
6663                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6664                         if (priority != flowtable->data.priority)
6665                                 return -EOPNOTSUPP;
6666                 }
6667
6668                 flowtable_hook->priority        = flowtable->data.priority;
6669                 flowtable_hook->num             = flowtable->hooknum;
6670         }
6671
6672         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
6673                 err = nf_tables_parse_netdev_hooks(ctx->net,
6674                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
6675                                                    &flowtable_hook->list);
6676                 if (err < 0)
6677                         return err;
6678         }
6679
6680         list_for_each_entry(hook, &flowtable_hook->list, list) {
6681                 hook->ops.pf            = NFPROTO_NETDEV;
6682                 hook->ops.hooknum       = flowtable_hook->num;
6683                 hook->ops.priority      = flowtable_hook->priority;
6684                 hook->ops.priv          = &flowtable->data;
6685                 hook->ops.hook          = flowtable->data.type->hook;
6686         }
6687
6688         return err;
6689 }
6690
6691 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
6692 {
6693         const struct nf_flowtable_type *type;
6694
6695         list_for_each_entry(type, &nf_tables_flowtables, list) {
6696                 if (family == type->family)
6697                         return type;
6698         }
6699         return NULL;
6700 }
6701
6702 static const struct nf_flowtable_type *
6703 nft_flowtable_type_get(struct net *net, u8 family)
6704 {
6705         const struct nf_flowtable_type *type;
6706
6707         type = __nft_flowtable_type_get(family);
6708         if (type != NULL && try_module_get(type->owner))
6709                 return type;
6710
6711         lockdep_nfnl_nft_mutex_not_held();
6712 #ifdef CONFIG_MODULES
6713         if (type == NULL) {
6714                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
6715                         return ERR_PTR(-EAGAIN);
6716         }
6717 #endif
6718         return ERR_PTR(-ENOENT);
6719 }
6720
6721 /* Only called from error and netdev event paths. */
6722 static void nft_unregister_flowtable_hook(struct net *net,
6723                                           struct nft_flowtable *flowtable,
6724                                           struct nft_hook *hook)
6725 {
6726         nf_unregister_net_hook(net, &hook->ops);
6727         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
6728                                     FLOW_BLOCK_UNBIND);
6729 }
6730
6731 static void nft_unregister_flowtable_net_hooks(struct net *net,
6732                                                struct list_head *hook_list)
6733 {
6734         struct nft_hook *hook;
6735
6736         list_for_each_entry(hook, hook_list, list)
6737                 nf_unregister_net_hook(net, &hook->ops);
6738 }
6739
6740 static int nft_register_flowtable_net_hooks(struct net *net,
6741                                             struct nft_table *table,
6742                                             struct list_head *hook_list,
6743                                             struct nft_flowtable *flowtable)
6744 {
6745         struct nft_hook *hook, *hook2, *next;
6746         struct nft_flowtable *ft;
6747         int err, i = 0;
6748
6749         list_for_each_entry(hook, hook_list, list) {
6750                 list_for_each_entry(ft, &table->flowtables, list) {
6751                         list_for_each_entry(hook2, &ft->hook_list, list) {
6752                                 if (hook->ops.dev == hook2->ops.dev &&
6753                                     hook->ops.pf == hook2->ops.pf) {
6754                                         err = -EEXIST;
6755                                         goto err_unregister_net_hooks;
6756                                 }
6757                         }
6758                 }
6759
6760                 err = flowtable->data.type->setup(&flowtable->data,
6761                                                   hook->ops.dev,
6762                                                   FLOW_BLOCK_BIND);
6763                 if (err < 0)
6764                         goto err_unregister_net_hooks;
6765
6766                 err = nf_register_net_hook(net, &hook->ops);
6767                 if (err < 0) {
6768                         flowtable->data.type->setup(&flowtable->data,
6769                                                     hook->ops.dev,
6770                                                     FLOW_BLOCK_UNBIND);
6771                         goto err_unregister_net_hooks;
6772                 }
6773
6774                 i++;
6775         }
6776
6777         return 0;
6778
6779 err_unregister_net_hooks:
6780         list_for_each_entry_safe(hook, next, hook_list, list) {
6781                 if (i-- <= 0)
6782                         break;
6783
6784                 nft_unregister_flowtable_hook(net, flowtable, hook);
6785                 list_del_rcu(&hook->list);
6786                 kfree_rcu(hook, rcu);
6787         }
6788
6789         return err;
6790 }
6791
6792 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
6793 {
6794         struct nft_hook *hook, *next;
6795
6796         list_for_each_entry_safe(hook, next, hook_list, list) {
6797                 list_del_rcu(&hook->list);
6798                 kfree_rcu(hook, rcu);
6799         }
6800 }
6801
6802 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
6803                                 struct nft_flowtable *flowtable)
6804 {
6805         const struct nlattr * const *nla = ctx->nla;
6806         struct nft_flowtable_hook flowtable_hook;
6807         struct nft_hook *hook, *next;
6808         struct nft_trans *trans;
6809         bool unregister = false;
6810         int err;
6811
6812         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
6813                                        &flowtable_hook, flowtable, false);
6814         if (err < 0)
6815                 return err;
6816
6817         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6818                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
6819                         list_del(&hook->list);
6820                         kfree(hook);
6821                 }
6822         }
6823
6824         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
6825                                                &flowtable_hook.list, flowtable);
6826         if (err < 0)
6827                 goto err_flowtable_update_hook;
6828
6829         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
6830                                 sizeof(struct nft_trans_flowtable));
6831         if (!trans) {
6832                 unregister = true;
6833                 err = -ENOMEM;
6834                 goto err_flowtable_update_hook;
6835         }
6836
6837         nft_trans_flowtable(trans) = flowtable;
6838         nft_trans_flowtable_update(trans) = true;
6839         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
6840         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
6841
6842         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6843
6844         return 0;
6845
6846 err_flowtable_update_hook:
6847         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6848                 if (unregister)
6849                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
6850                 list_del_rcu(&hook->list);
6851                 kfree_rcu(hook, rcu);
6852         }
6853
6854         return err;
6855
6856 }
6857
6858 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
6859                                   struct sk_buff *skb,
6860                                   const struct nlmsghdr *nlh,
6861                                   const struct nlattr * const nla[],
6862                                   struct netlink_ext_ack *extack)
6863 {
6864         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6865         struct nft_flowtable_hook flowtable_hook;
6866         const struct nf_flowtable_type *type;
6867         u8 genmask = nft_genmask_next(net);
6868         int family = nfmsg->nfgen_family;
6869         struct nft_flowtable *flowtable;
6870         struct nft_hook *hook, *next;
6871         struct nft_table *table;
6872         struct nft_ctx ctx;
6873         int err;
6874
6875         if (!nla[NFTA_FLOWTABLE_TABLE] ||
6876             !nla[NFTA_FLOWTABLE_NAME] ||
6877             !nla[NFTA_FLOWTABLE_HOOK])
6878                 return -EINVAL;
6879
6880         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6881                                  genmask);
6882         if (IS_ERR(table)) {
6883                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6884                 return PTR_ERR(table);
6885         }
6886
6887         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6888                                          genmask);
6889         if (IS_ERR(flowtable)) {
6890                 err = PTR_ERR(flowtable);
6891                 if (err != -ENOENT) {
6892                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6893                         return err;
6894                 }
6895         } else {
6896                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6897                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6898                         return -EEXIST;
6899                 }
6900
6901                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6902
6903                 return nft_flowtable_update(&ctx, nlh, flowtable);
6904         }
6905
6906         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6907
6908         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
6909         if (!flowtable)
6910                 return -ENOMEM;
6911
6912         flowtable->table = table;
6913         flowtable->handle = nf_tables_alloc_handle(table);
6914         INIT_LIST_HEAD(&flowtable->hook_list);
6915
6916         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
6917         if (!flowtable->name) {
6918                 err = -ENOMEM;
6919                 goto err1;
6920         }
6921
6922         type = nft_flowtable_type_get(net, family);
6923         if (IS_ERR(type)) {
6924                 err = PTR_ERR(type);
6925                 goto err2;
6926         }
6927
6928         if (nla[NFTA_FLOWTABLE_FLAGS]) {
6929                 flowtable->data.flags =
6930                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
6931                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK)
6932                         goto err3;
6933         }
6934
6935         write_pnet(&flowtable->data.net, net);
6936         flowtable->data.type = type;
6937         err = type->init(&flowtable->data);
6938         if (err < 0)
6939                 goto err3;
6940
6941         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
6942                                        &flowtable_hook, flowtable, true);
6943         if (err < 0)
6944                 goto err4;
6945
6946         list_splice(&flowtable_hook.list, &flowtable->hook_list);
6947         flowtable->data.priority = flowtable_hook.priority;
6948         flowtable->hooknum = flowtable_hook.num;
6949
6950         err = nft_register_flowtable_net_hooks(ctx.net, table,
6951                                                &flowtable->hook_list,
6952                                                flowtable);
6953         if (err < 0) {
6954                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
6955                 goto err4;
6956         }
6957
6958         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
6959         if (err < 0)
6960                 goto err5;
6961
6962         list_add_tail_rcu(&flowtable->list, &table->flowtables);
6963         table->use++;
6964
6965         return 0;
6966 err5:
6967         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
6968                 nft_unregister_flowtable_hook(net, flowtable, hook);
6969                 list_del_rcu(&hook->list);
6970                 kfree_rcu(hook, rcu);
6971         }
6972 err4:
6973         flowtable->data.type->free(&flowtable->data);
6974 err3:
6975         module_put(type->owner);
6976 err2:
6977         kfree(flowtable->name);
6978 err1:
6979         kfree(flowtable);
6980         return err;
6981 }
6982
6983 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
6984 {
6985         struct nft_hook *this, *next;
6986
6987         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
6988                 list_del(&this->list);
6989                 kfree(this);
6990         }
6991 }
6992
6993 static int nft_delflowtable_hook(struct nft_ctx *ctx,
6994                                  struct nft_flowtable *flowtable)
6995 {
6996         const struct nlattr * const *nla = ctx->nla;
6997         struct nft_flowtable_hook flowtable_hook;
6998         struct nft_hook *this, *hook;
6999         struct nft_trans *trans;
7000         int err;
7001
7002         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7003                                        &flowtable_hook, flowtable, false);
7004         if (err < 0)
7005                 return err;
7006
7007         list_for_each_entry(this, &flowtable_hook.list, list) {
7008                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7009                 if (!hook) {
7010                         err = -ENOENT;
7011                         goto err_flowtable_del_hook;
7012                 }
7013                 hook->inactive = true;
7014         }
7015
7016         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7017                                 sizeof(struct nft_trans_flowtable));
7018         if (!trans) {
7019                 err = -ENOMEM;
7020                 goto err_flowtable_del_hook;
7021         }
7022
7023         nft_trans_flowtable(trans) = flowtable;
7024         nft_trans_flowtable_update(trans) = true;
7025         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7026         nft_flowtable_hook_release(&flowtable_hook);
7027
7028         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
7029
7030         return 0;
7031
7032 err_flowtable_del_hook:
7033         list_for_each_entry(this, &flowtable_hook.list, list) {
7034                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7035                 if (!hook)
7036                         break;
7037
7038                 hook->inactive = false;
7039         }
7040         nft_flowtable_hook_release(&flowtable_hook);
7041
7042         return err;
7043 }
7044
7045 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
7046                                   struct sk_buff *skb,
7047                                   const struct nlmsghdr *nlh,
7048                                   const struct nlattr * const nla[],
7049                                   struct netlink_ext_ack *extack)
7050 {
7051         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7052         u8 genmask = nft_genmask_next(net);
7053         int family = nfmsg->nfgen_family;
7054         struct nft_flowtable *flowtable;
7055         const struct nlattr *attr;
7056         struct nft_table *table;
7057         struct nft_ctx ctx;
7058
7059         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7060             (!nla[NFTA_FLOWTABLE_NAME] &&
7061              !nla[NFTA_FLOWTABLE_HANDLE]))
7062                 return -EINVAL;
7063
7064         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7065                                  genmask);
7066         if (IS_ERR(table)) {
7067                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7068                 return PTR_ERR(table);
7069         }
7070
7071         if (nla[NFTA_FLOWTABLE_HANDLE]) {
7072                 attr = nla[NFTA_FLOWTABLE_HANDLE];
7073                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7074         } else {
7075                 attr = nla[NFTA_FLOWTABLE_NAME];
7076                 flowtable = nft_flowtable_lookup(table, attr, genmask);
7077         }
7078
7079         if (IS_ERR(flowtable)) {
7080                 NL_SET_BAD_ATTR(extack, attr);
7081                 return PTR_ERR(flowtable);
7082         }
7083
7084         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
7085
7086         if (nla[NFTA_FLOWTABLE_HOOK])
7087                 return nft_delflowtable_hook(&ctx, flowtable);
7088
7089         if (flowtable->use > 0) {
7090                 NL_SET_BAD_ATTR(extack, attr);
7091                 return -EBUSY;
7092         }
7093
7094         return nft_delflowtable(&ctx, flowtable);
7095 }
7096
7097 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7098                                          u32 portid, u32 seq, int event,
7099                                          u32 flags, int family,
7100                                          struct nft_flowtable *flowtable,
7101                                          struct list_head *hook_list)
7102 {
7103         struct nlattr *nest, *nest_devs;
7104         struct nfgenmsg *nfmsg;
7105         struct nft_hook *hook;
7106         struct nlmsghdr *nlh;
7107
7108         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7109         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
7110         if (nlh == NULL)
7111                 goto nla_put_failure;
7112
7113         nfmsg = nlmsg_data(nlh);
7114         nfmsg->nfgen_family     = family;
7115         nfmsg->version          = NFNETLINK_V0;
7116         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
7117
7118         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7119             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7120             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7121             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7122                          NFTA_FLOWTABLE_PAD) ||
7123             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7124                 goto nla_put_failure;
7125
7126         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7127         if (!nest)
7128                 goto nla_put_failure;
7129         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7130             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7131                 goto nla_put_failure;
7132
7133         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7134         if (!nest_devs)
7135                 goto nla_put_failure;
7136
7137         list_for_each_entry_rcu(hook, hook_list, list) {
7138                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7139                         goto nla_put_failure;
7140         }
7141         nla_nest_end(skb, nest_devs);
7142         nla_nest_end(skb, nest);
7143
7144         nlmsg_end(skb, nlh);
7145         return 0;
7146
7147 nla_put_failure:
7148         nlmsg_trim(skb, nlh);
7149         return -1;
7150 }
7151
7152 struct nft_flowtable_filter {
7153         char            *table;
7154 };
7155
7156 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7157                                     struct netlink_callback *cb)
7158 {
7159         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7160         struct nft_flowtable_filter *filter = cb->data;
7161         unsigned int idx = 0, s_idx = cb->args[0];
7162         struct net *net = sock_net(skb->sk);
7163         int family = nfmsg->nfgen_family;
7164         struct nft_flowtable *flowtable;
7165         const struct nft_table *table;
7166
7167         rcu_read_lock();
7168         cb->seq = net->nft.base_seq;
7169
7170         list_for_each_entry_rcu(table, &net->nft.tables, list) {
7171                 if (family != NFPROTO_UNSPEC && family != table->family)
7172                         continue;
7173
7174                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7175                         if (!nft_is_active(net, flowtable))
7176                                 goto cont;
7177                         if (idx < s_idx)
7178                                 goto cont;
7179                         if (idx > s_idx)
7180                                 memset(&cb->args[1], 0,
7181                                        sizeof(cb->args) - sizeof(cb->args[0]));
7182                         if (filter && filter->table &&
7183                             strcmp(filter->table, table->name))
7184                                 goto cont;
7185
7186                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7187                                                           cb->nlh->nlmsg_seq,
7188                                                           NFT_MSG_NEWFLOWTABLE,
7189                                                           NLM_F_MULTI | NLM_F_APPEND,
7190                                                           table->family,
7191                                                           flowtable,
7192                                                           &flowtable->hook_list) < 0)
7193                                 goto done;
7194
7195                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7196 cont:
7197                         idx++;
7198                 }
7199         }
7200 done:
7201         rcu_read_unlock();
7202
7203         cb->args[0] = idx;
7204         return skb->len;
7205 }
7206
7207 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7208 {
7209         const struct nlattr * const *nla = cb->data;
7210         struct nft_flowtable_filter *filter = NULL;
7211
7212         if (nla[NFTA_FLOWTABLE_TABLE]) {
7213                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7214                 if (!filter)
7215                         return -ENOMEM;
7216
7217                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7218                                            GFP_ATOMIC);
7219                 if (!filter->table) {
7220                         kfree(filter);
7221                         return -ENOMEM;
7222                 }
7223         }
7224
7225         cb->data = filter;
7226         return 0;
7227 }
7228
7229 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7230 {
7231         struct nft_flowtable_filter *filter = cb->data;
7232
7233         if (!filter)
7234                 return 0;
7235
7236         kfree(filter->table);
7237         kfree(filter);
7238
7239         return 0;
7240 }
7241
7242 /* called with rcu_read_lock held */
7243 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
7244                                   struct sk_buff *skb,
7245                                   const struct nlmsghdr *nlh,
7246                                   const struct nlattr * const nla[],
7247                                   struct netlink_ext_ack *extack)
7248 {
7249         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7250         u8 genmask = nft_genmask_cur(net);
7251         int family = nfmsg->nfgen_family;
7252         struct nft_flowtable *flowtable;
7253         const struct nft_table *table;
7254         struct sk_buff *skb2;
7255         int err;
7256
7257         if (nlh->nlmsg_flags & NLM_F_DUMP) {
7258                 struct netlink_dump_control c = {
7259                         .start = nf_tables_dump_flowtable_start,
7260                         .dump = nf_tables_dump_flowtable,
7261                         .done = nf_tables_dump_flowtable_done,
7262                         .module = THIS_MODULE,
7263                         .data = (void *)nla,
7264                 };
7265
7266                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
7267         }
7268
7269         if (!nla[NFTA_FLOWTABLE_NAME])
7270                 return -EINVAL;
7271
7272         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7273                                  genmask);
7274         if (IS_ERR(table))
7275                 return PTR_ERR(table);
7276
7277         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7278                                          genmask);
7279         if (IS_ERR(flowtable))
7280                 return PTR_ERR(flowtable);
7281
7282         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7283         if (!skb2)
7284                 return -ENOMEM;
7285
7286         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7287                                             nlh->nlmsg_seq,
7288                                             NFT_MSG_NEWFLOWTABLE, 0, family,
7289                                             flowtable, &flowtable->hook_list);
7290         if (err < 0)
7291                 goto err_fill_flowtable_info;
7292
7293         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7294
7295 err_fill_flowtable_info:
7296         kfree_skb(skb2);
7297         return err;
7298 }
7299
7300 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7301                                        struct nft_flowtable *flowtable,
7302                                        struct list_head *hook_list,
7303                                        int event)
7304 {
7305         struct sk_buff *skb;
7306         int err;
7307         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
7308                               flowtable->table->name, flowtable->table->handle,
7309                               flowtable->name, flowtable->handle);
7310
7311         audit_log_nfcfg(buf,
7312                         ctx->family,
7313                         flowtable->hooknum,
7314                         event == NFT_MSG_NEWFLOWTABLE ?
7315                                 AUDIT_NFT_OP_FLOWTABLE_REGISTER :
7316                                 AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
7317                         GFP_KERNEL);
7318         kfree(buf);
7319
7320         if (!ctx->report &&
7321             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7322                 return;
7323
7324         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7325         if (skb == NULL)
7326                 goto err;
7327
7328         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7329                                             ctx->seq, event, 0,
7330                                             ctx->family, flowtable, hook_list);
7331         if (err < 0) {
7332                 kfree_skb(skb);
7333                 goto err;
7334         }
7335
7336         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
7337         return;
7338 err:
7339         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7340 }
7341
7342 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7343 {
7344         struct nft_hook *hook, *next;
7345
7346         flowtable->data.type->free(&flowtable->data);
7347         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7348                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7349                                             FLOW_BLOCK_UNBIND);
7350                 list_del_rcu(&hook->list);
7351                 kfree(hook);
7352         }
7353         kfree(flowtable->name);
7354         module_put(flowtable->data.type->owner);
7355         kfree(flowtable);
7356 }
7357
7358 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7359                                    u32 portid, u32 seq)
7360 {
7361         struct nlmsghdr *nlh;
7362         struct nfgenmsg *nfmsg;
7363         char buf[TASK_COMM_LEN];
7364         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7365
7366         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
7367         if (nlh == NULL)
7368                 goto nla_put_failure;
7369
7370         nfmsg = nlmsg_data(nlh);
7371         nfmsg->nfgen_family     = AF_UNSPEC;
7372         nfmsg->version          = NFNETLINK_V0;
7373         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
7374
7375         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
7376             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7377             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7378                 goto nla_put_failure;
7379
7380         nlmsg_end(skb, nlh);
7381         return 0;
7382
7383 nla_put_failure:
7384         nlmsg_trim(skb, nlh);
7385         return -EMSGSIZE;
7386 }
7387
7388 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7389                                 struct nft_flowtable *flowtable)
7390 {
7391         struct nft_hook *hook;
7392
7393         list_for_each_entry(hook, &flowtable->hook_list, list) {
7394                 if (hook->ops.dev != dev)
7395                         continue;
7396
7397                 /* flow_offload_netdev_event() cleans up entries for us. */
7398                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
7399                 list_del_rcu(&hook->list);
7400                 kfree_rcu(hook, rcu);
7401                 break;
7402         }
7403 }
7404
7405 static int nf_tables_flowtable_event(struct notifier_block *this,
7406                                      unsigned long event, void *ptr)
7407 {
7408         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7409         struct nft_flowtable *flowtable;
7410         struct nft_table *table;
7411         struct net *net;
7412
7413         if (event != NETDEV_UNREGISTER)
7414                 return 0;
7415
7416         net = dev_net(dev);
7417         mutex_lock(&net->nft.commit_mutex);
7418         list_for_each_entry(table, &net->nft.tables, list) {
7419                 list_for_each_entry(flowtable, &table->flowtables, list) {
7420                         nft_flowtable_event(event, dev, flowtable);
7421                 }
7422         }
7423         mutex_unlock(&net->nft.commit_mutex);
7424
7425         return NOTIFY_DONE;
7426 }
7427
7428 static struct notifier_block nf_tables_flowtable_notifier = {
7429         .notifier_call  = nf_tables_flowtable_event,
7430 };
7431
7432 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
7433                                  int event)
7434 {
7435         struct nlmsghdr *nlh = nlmsg_hdr(skb);
7436         struct sk_buff *skb2;
7437         int err;
7438
7439         audit_log_nfcfg("?:0;?:0", 0, net->nft.base_seq,
7440                         AUDIT_NFT_OP_GEN_REGISTER, GFP_KERNEL);
7441
7442         if (!nlmsg_report(nlh) &&
7443             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7444                 return;
7445
7446         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7447         if (skb2 == NULL)
7448                 goto err;
7449
7450         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7451                                       nlh->nlmsg_seq);
7452         if (err < 0) {
7453                 kfree_skb(skb2);
7454                 goto err;
7455         }
7456
7457         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7458                        nlmsg_report(nlh), GFP_KERNEL);
7459         return;
7460 err:
7461         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7462                           -ENOBUFS);
7463 }
7464
7465 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
7466                             struct sk_buff *skb, const struct nlmsghdr *nlh,
7467                             const struct nlattr * const nla[],
7468                             struct netlink_ext_ack *extack)
7469 {
7470         struct sk_buff *skb2;
7471         int err;
7472
7473         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7474         if (skb2 == NULL)
7475                 return -ENOMEM;
7476
7477         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7478                                       nlh->nlmsg_seq);
7479         if (err < 0)
7480                 goto err_fill_gen_info;
7481
7482         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7483
7484 err_fill_gen_info:
7485         kfree_skb(skb2);
7486         return err;
7487 }
7488
7489 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
7490         [NFT_MSG_NEWTABLE] = {
7491                 .call_batch     = nf_tables_newtable,
7492                 .attr_count     = NFTA_TABLE_MAX,
7493                 .policy         = nft_table_policy,
7494         },
7495         [NFT_MSG_GETTABLE] = {
7496                 .call_rcu       = nf_tables_gettable,
7497                 .attr_count     = NFTA_TABLE_MAX,
7498                 .policy         = nft_table_policy,
7499         },
7500         [NFT_MSG_DELTABLE] = {
7501                 .call_batch     = nf_tables_deltable,
7502                 .attr_count     = NFTA_TABLE_MAX,
7503                 .policy         = nft_table_policy,
7504         },
7505         [NFT_MSG_NEWCHAIN] = {
7506                 .call_batch     = nf_tables_newchain,
7507                 .attr_count     = NFTA_CHAIN_MAX,
7508                 .policy         = nft_chain_policy,
7509         },
7510         [NFT_MSG_GETCHAIN] = {
7511                 .call_rcu       = nf_tables_getchain,
7512                 .attr_count     = NFTA_CHAIN_MAX,
7513                 .policy         = nft_chain_policy,
7514         },
7515         [NFT_MSG_DELCHAIN] = {
7516                 .call_batch     = nf_tables_delchain,
7517                 .attr_count     = NFTA_CHAIN_MAX,
7518                 .policy         = nft_chain_policy,
7519         },
7520         [NFT_MSG_NEWRULE] = {
7521                 .call_batch     = nf_tables_newrule,
7522                 .attr_count     = NFTA_RULE_MAX,
7523                 .policy         = nft_rule_policy,
7524         },
7525         [NFT_MSG_GETRULE] = {
7526                 .call_rcu       = nf_tables_getrule,
7527                 .attr_count     = NFTA_RULE_MAX,
7528                 .policy         = nft_rule_policy,
7529         },
7530         [NFT_MSG_DELRULE] = {
7531                 .call_batch     = nf_tables_delrule,
7532                 .attr_count     = NFTA_RULE_MAX,
7533                 .policy         = nft_rule_policy,
7534         },
7535         [NFT_MSG_NEWSET] = {
7536                 .call_batch     = nf_tables_newset,
7537                 .attr_count     = NFTA_SET_MAX,
7538                 .policy         = nft_set_policy,
7539         },
7540         [NFT_MSG_GETSET] = {
7541                 .call_rcu       = nf_tables_getset,
7542                 .attr_count     = NFTA_SET_MAX,
7543                 .policy         = nft_set_policy,
7544         },
7545         [NFT_MSG_DELSET] = {
7546                 .call_batch     = nf_tables_delset,
7547                 .attr_count     = NFTA_SET_MAX,
7548                 .policy         = nft_set_policy,
7549         },
7550         [NFT_MSG_NEWSETELEM] = {
7551                 .call_batch     = nf_tables_newsetelem,
7552                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7553                 .policy         = nft_set_elem_list_policy,
7554         },
7555         [NFT_MSG_GETSETELEM] = {
7556                 .call_rcu       = nf_tables_getsetelem,
7557                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7558                 .policy         = nft_set_elem_list_policy,
7559         },
7560         [NFT_MSG_DELSETELEM] = {
7561                 .call_batch     = nf_tables_delsetelem,
7562                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7563                 .policy         = nft_set_elem_list_policy,
7564         },
7565         [NFT_MSG_GETGEN] = {
7566                 .call_rcu       = nf_tables_getgen,
7567         },
7568         [NFT_MSG_NEWOBJ] = {
7569                 .call_batch     = nf_tables_newobj,
7570                 .attr_count     = NFTA_OBJ_MAX,
7571                 .policy         = nft_obj_policy,
7572         },
7573         [NFT_MSG_GETOBJ] = {
7574                 .call_rcu       = nf_tables_getobj,
7575                 .attr_count     = NFTA_OBJ_MAX,
7576                 .policy         = nft_obj_policy,
7577         },
7578         [NFT_MSG_DELOBJ] = {
7579                 .call_batch     = nf_tables_delobj,
7580                 .attr_count     = NFTA_OBJ_MAX,
7581                 .policy         = nft_obj_policy,
7582         },
7583         [NFT_MSG_GETOBJ_RESET] = {
7584                 .call_rcu       = nf_tables_getobj,
7585                 .attr_count     = NFTA_OBJ_MAX,
7586                 .policy         = nft_obj_policy,
7587         },
7588         [NFT_MSG_NEWFLOWTABLE] = {
7589                 .call_batch     = nf_tables_newflowtable,
7590                 .attr_count     = NFTA_FLOWTABLE_MAX,
7591                 .policy         = nft_flowtable_policy,
7592         },
7593         [NFT_MSG_GETFLOWTABLE] = {
7594                 .call_rcu       = nf_tables_getflowtable,
7595                 .attr_count     = NFTA_FLOWTABLE_MAX,
7596                 .policy         = nft_flowtable_policy,
7597         },
7598         [NFT_MSG_DELFLOWTABLE] = {
7599                 .call_batch     = nf_tables_delflowtable,
7600                 .attr_count     = NFTA_FLOWTABLE_MAX,
7601                 .policy         = nft_flowtable_policy,
7602         },
7603 };
7604
7605 static int nf_tables_validate(struct net *net)
7606 {
7607         struct nft_table *table;
7608
7609         switch (net->nft.validate_state) {
7610         case NFT_VALIDATE_SKIP:
7611                 break;
7612         case NFT_VALIDATE_NEED:
7613                 nft_validate_state_update(net, NFT_VALIDATE_DO);
7614                 fallthrough;
7615         case NFT_VALIDATE_DO:
7616                 list_for_each_entry(table, &net->nft.tables, list) {
7617                         if (nft_table_validate(net, table) < 0)
7618                                 return -EAGAIN;
7619                 }
7620                 break;
7621         }
7622
7623         return 0;
7624 }
7625
7626 /* a drop policy has to be deferred until all rules have been activated,
7627  * otherwise a large ruleset that contains a drop-policy base chain will
7628  * cause all packets to get dropped until the full transaction has been
7629  * processed.
7630  *
7631  * We defer the drop policy until the transaction has been finalized.
7632  */
7633 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
7634 {
7635         struct nft_base_chain *basechain;
7636
7637         if (nft_trans_chain_policy(trans) != NF_DROP)
7638                 return;
7639
7640         if (!nft_is_base_chain(trans->ctx.chain))
7641                 return;
7642
7643         basechain = nft_base_chain(trans->ctx.chain);
7644         basechain->policy = NF_DROP;
7645 }
7646
7647 static void nft_chain_commit_update(struct nft_trans *trans)
7648 {
7649         struct nft_base_chain *basechain;
7650
7651         if (nft_trans_chain_name(trans)) {
7652                 rhltable_remove(&trans->ctx.table->chains_ht,
7653                                 &trans->ctx.chain->rhlhead,
7654                                 nft_chain_ht_params);
7655                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
7656                 rhltable_insert_key(&trans->ctx.table->chains_ht,
7657                                     trans->ctx.chain->name,
7658                                     &trans->ctx.chain->rhlhead,
7659                                     nft_chain_ht_params);
7660         }
7661
7662         if (!nft_is_base_chain(trans->ctx.chain))
7663                 return;
7664
7665         nft_chain_stats_replace(trans);
7666
7667         basechain = nft_base_chain(trans->ctx.chain);
7668
7669         switch (nft_trans_chain_policy(trans)) {
7670         case NF_DROP:
7671         case NF_ACCEPT:
7672                 basechain->policy = nft_trans_chain_policy(trans);
7673                 break;
7674         }
7675 }
7676
7677 static void nft_obj_commit_update(struct nft_trans *trans)
7678 {
7679         struct nft_object *newobj;
7680         struct nft_object *obj;
7681
7682         obj = nft_trans_obj(trans);
7683         newobj = nft_trans_obj_newobj(trans);
7684
7685         if (obj->ops->update)
7686                 obj->ops->update(obj, newobj);
7687
7688         kfree(newobj);
7689 }
7690
7691 static void nft_commit_release(struct nft_trans *trans)
7692 {
7693         switch (trans->msg_type) {
7694         case NFT_MSG_DELTABLE:
7695                 nf_tables_table_destroy(&trans->ctx);
7696                 break;
7697         case NFT_MSG_NEWCHAIN:
7698                 free_percpu(nft_trans_chain_stats(trans));
7699                 kfree(nft_trans_chain_name(trans));
7700                 break;
7701         case NFT_MSG_DELCHAIN:
7702                 nf_tables_chain_destroy(&trans->ctx);
7703                 break;
7704         case NFT_MSG_DELRULE:
7705                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
7706                 break;
7707         case NFT_MSG_DELSET:
7708                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
7709                 break;
7710         case NFT_MSG_DELSETELEM:
7711                 nf_tables_set_elem_destroy(&trans->ctx,
7712                                            nft_trans_elem_set(trans),
7713                                            nft_trans_elem(trans).priv);
7714                 break;
7715         case NFT_MSG_DELOBJ:
7716                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
7717                 break;
7718         case NFT_MSG_DELFLOWTABLE:
7719                 if (nft_trans_flowtable_update(trans))
7720                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
7721                 else
7722                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
7723                 break;
7724         }
7725
7726         if (trans->put_net)
7727                 put_net(trans->ctx.net);
7728
7729         kfree(trans);
7730 }
7731
7732 static void nf_tables_trans_destroy_work(struct work_struct *w)
7733 {
7734         struct nft_trans *trans, *next;
7735         LIST_HEAD(head);
7736
7737         spin_lock(&nf_tables_destroy_list_lock);
7738         list_splice_init(&nf_tables_destroy_list, &head);
7739         spin_unlock(&nf_tables_destroy_list_lock);
7740
7741         if (list_empty(&head))
7742                 return;
7743
7744         synchronize_rcu();
7745
7746         list_for_each_entry_safe(trans, next, &head, list) {
7747                 list_del(&trans->list);
7748                 nft_commit_release(trans);
7749         }
7750 }
7751
7752 void nf_tables_trans_destroy_flush_work(void)
7753 {
7754         flush_work(&trans_destroy_work);
7755 }
7756 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
7757
7758 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
7759 {
7760         struct nft_rule *rule;
7761         unsigned int alloc = 0;
7762         int i;
7763
7764         /* already handled or inactive chain? */
7765         if (chain->rules_next || !nft_is_active_next(net, chain))
7766                 return 0;
7767
7768         rule = list_entry(&chain->rules, struct nft_rule, list);
7769         i = 0;
7770
7771         list_for_each_entry_continue(rule, &chain->rules, list) {
7772                 if (nft_is_active_next(net, rule))
7773                         alloc++;
7774         }
7775
7776         chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
7777         if (!chain->rules_next)
7778                 return -ENOMEM;
7779
7780         list_for_each_entry_continue(rule, &chain->rules, list) {
7781                 if (nft_is_active_next(net, rule))
7782                         chain->rules_next[i++] = rule;
7783         }
7784
7785         chain->rules_next[i] = NULL;
7786         return 0;
7787 }
7788
7789 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
7790 {
7791         struct nft_trans *trans, *next;
7792
7793         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7794                 struct nft_chain *chain = trans->ctx.chain;
7795
7796                 if (trans->msg_type == NFT_MSG_NEWRULE ||
7797                     trans->msg_type == NFT_MSG_DELRULE) {
7798                         kvfree(chain->rules_next);
7799                         chain->rules_next = NULL;
7800                 }
7801         }
7802 }
7803
7804 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
7805 {
7806         struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
7807
7808         kvfree(o->start);
7809 }
7810
7811 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
7812 {
7813         struct nft_rule **r = rules;
7814         struct nft_rules_old *old;
7815
7816         while (*r)
7817                 r++;
7818
7819         r++;    /* rcu_head is after end marker */
7820         old = (void *) r;
7821         old->start = rules;
7822
7823         call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
7824 }
7825
7826 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
7827 {
7828         struct nft_rule **g0, **g1;
7829         bool next_genbit;
7830
7831         next_genbit = nft_gencursor_next(net);
7832
7833         g0 = rcu_dereference_protected(chain->rules_gen_0,
7834                                        lockdep_commit_lock_is_held(net));
7835         g1 = rcu_dereference_protected(chain->rules_gen_1,
7836                                        lockdep_commit_lock_is_held(net));
7837
7838         /* No changes to this chain? */
7839         if (chain->rules_next == NULL) {
7840                 /* chain had no change in last or next generation */
7841                 if (g0 == g1)
7842                         return;
7843                 /*
7844                  * chain had no change in this generation; make sure next
7845                  * one uses same rules as current generation.
7846                  */
7847                 if (next_genbit) {
7848                         rcu_assign_pointer(chain->rules_gen_1, g0);
7849                         nf_tables_commit_chain_free_rules_old(g1);
7850                 } else {
7851                         rcu_assign_pointer(chain->rules_gen_0, g1);
7852                         nf_tables_commit_chain_free_rules_old(g0);
7853                 }
7854
7855                 return;
7856         }
7857
7858         if (next_genbit)
7859                 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
7860         else
7861                 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
7862
7863         chain->rules_next = NULL;
7864
7865         if (g0 == g1)
7866                 return;
7867
7868         if (next_genbit)
7869                 nf_tables_commit_chain_free_rules_old(g1);
7870         else
7871                 nf_tables_commit_chain_free_rules_old(g0);
7872 }
7873
7874 static void nft_obj_del(struct nft_object *obj)
7875 {
7876         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
7877         list_del_rcu(&obj->list);
7878 }
7879
7880 void nft_chain_del(struct nft_chain *chain)
7881 {
7882         struct nft_table *table = chain->table;
7883
7884         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
7885                                      nft_chain_ht_params));
7886         list_del_rcu(&chain->list);
7887 }
7888
7889 static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
7890                                     struct list_head *hook_list)
7891 {
7892         struct nft_hook *hook, *next;
7893
7894         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7895                 if (hook->inactive)
7896                         list_move(&hook->list, hook_list);
7897         }
7898 }
7899
7900 static void nf_tables_module_autoload_cleanup(struct net *net)
7901 {
7902         struct nft_module_request *req, *next;
7903
7904         WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
7905         list_for_each_entry_safe(req, next, &net->nft.module_list, list) {
7906                 WARN_ON_ONCE(!req->done);
7907                 list_del(&req->list);
7908                 kfree(req);
7909         }
7910 }
7911
7912 static void nf_tables_commit_release(struct net *net)
7913 {
7914         struct nft_trans *trans;
7915
7916         /* all side effects have to be made visible.
7917          * For example, if a chain named 'foo' has been deleted, a
7918          * new transaction must not find it anymore.
7919          *
7920          * Memory reclaim happens asynchronously from work queue
7921          * to prevent expensive synchronize_rcu() in commit phase.
7922          */
7923         if (list_empty(&net->nft.commit_list)) {
7924                 nf_tables_module_autoload_cleanup(net);
7925                 mutex_unlock(&net->nft.commit_mutex);
7926                 return;
7927         }
7928
7929         trans = list_last_entry(&net->nft.commit_list,
7930                                 struct nft_trans, list);
7931         get_net(trans->ctx.net);
7932         WARN_ON_ONCE(trans->put_net);
7933
7934         trans->put_net = true;
7935         spin_lock(&nf_tables_destroy_list_lock);
7936         list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
7937         spin_unlock(&nf_tables_destroy_list_lock);
7938
7939         nf_tables_module_autoload_cleanup(net);
7940         schedule_work(&trans_destroy_work);
7941
7942         mutex_unlock(&net->nft.commit_mutex);
7943 }
7944
7945 static void nft_commit_notify(struct net *net, u32 portid)
7946 {
7947         struct sk_buff *batch_skb = NULL, *nskb, *skb;
7948         unsigned char *data;
7949         int len;
7950
7951         list_for_each_entry_safe(skb, nskb, &net->nft.notify_list, list) {
7952                 if (!batch_skb) {
7953 new_batch:
7954                         batch_skb = skb;
7955                         len = NLMSG_GOODSIZE - skb->len;
7956                         list_del(&skb->list);
7957                         continue;
7958                 }
7959                 len -= skb->len;
7960                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
7961                         data = skb_put(batch_skb, skb->len);
7962                         memcpy(data, skb->data, skb->len);
7963                         list_del(&skb->list);
7964                         kfree_skb(skb);
7965                         continue;
7966                 }
7967                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
7968                                NFT_CB(batch_skb).report, GFP_KERNEL);
7969                 goto new_batch;
7970         }
7971
7972         if (batch_skb) {
7973                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
7974                                NFT_CB(batch_skb).report, GFP_KERNEL);
7975         }
7976
7977         WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
7978 }
7979
7980 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
7981 {
7982         struct nft_trans *trans, *next;
7983         struct nft_trans_elem *te;
7984         struct nft_chain *chain;
7985         struct nft_table *table;
7986         int err;
7987
7988         if (list_empty(&net->nft.commit_list)) {
7989                 mutex_unlock(&net->nft.commit_mutex);
7990                 return 0;
7991         }
7992
7993         /* 0. Validate ruleset, otherwise roll back for error reporting. */
7994         if (nf_tables_validate(net) < 0)
7995                 return -EAGAIN;
7996
7997         err = nft_flow_rule_offload_commit(net);
7998         if (err < 0)
7999                 return err;
8000
8001         /* 1.  Allocate space for next generation rules_gen_X[] */
8002         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
8003                 int ret;
8004
8005                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8006                     trans->msg_type == NFT_MSG_DELRULE) {
8007                         chain = trans->ctx.chain;
8008
8009                         ret = nf_tables_commit_chain_prepare(net, chain);
8010                         if (ret < 0) {
8011                                 nf_tables_commit_chain_prepare_cancel(net);
8012                                 return ret;
8013                         }
8014                 }
8015         }
8016
8017         /* step 2.  Make rules_gen_X visible to packet path */
8018         list_for_each_entry(table, &net->nft.tables, list) {
8019                 list_for_each_entry(chain, &table->chains, list)
8020                         nf_tables_commit_chain(net, chain);
8021         }
8022
8023         /*
8024          * Bump generation counter, invalidate any dump in progress.
8025          * Cannot fail after this point.
8026          */
8027         while (++net->nft.base_seq == 0);
8028
8029         /* step 3. Start new generation, rules_gen_X now in use. */
8030         net->nft.gencursor = nft_gencursor_next(net);
8031
8032         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
8033                 switch (trans->msg_type) {
8034                 case NFT_MSG_NEWTABLE:
8035                         if (nft_trans_table_update(trans)) {
8036                                 if (!nft_trans_table_enable(trans)) {
8037                                         nf_tables_table_disable(net,
8038                                                                 trans->ctx.table);
8039                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8040                                 }
8041                         } else {
8042                                 nft_clear(net, trans->ctx.table);
8043                         }
8044                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8045                         nft_trans_destroy(trans);
8046                         break;
8047                 case NFT_MSG_DELTABLE:
8048                         list_del_rcu(&trans->ctx.table->list);
8049                         nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8050                         break;
8051                 case NFT_MSG_NEWCHAIN:
8052                         if (nft_trans_chain_update(trans)) {
8053                                 nft_chain_commit_update(trans);
8054                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8055                                 /* trans destroyed after rcu grace period */
8056                         } else {
8057                                 nft_chain_commit_drop_policy(trans);
8058                                 nft_clear(net, trans->ctx.chain);
8059                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8060                                 nft_trans_destroy(trans);
8061                         }
8062                         break;
8063                 case NFT_MSG_DELCHAIN:
8064                         nft_chain_del(trans->ctx.chain);
8065                         nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8066                         nf_tables_unregister_hook(trans->ctx.net,
8067                                                   trans->ctx.table,
8068                                                   trans->ctx.chain);
8069                         break;
8070                 case NFT_MSG_NEWRULE:
8071                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8072                         nf_tables_rule_notify(&trans->ctx,
8073                                               nft_trans_rule(trans),
8074                                               NFT_MSG_NEWRULE);
8075                         nft_trans_destroy(trans);
8076                         break;
8077                 case NFT_MSG_DELRULE:
8078                         list_del_rcu(&nft_trans_rule(trans)->list);
8079                         nf_tables_rule_notify(&trans->ctx,
8080                                               nft_trans_rule(trans),
8081                                               NFT_MSG_DELRULE);
8082                         nft_rule_expr_deactivate(&trans->ctx,
8083                                                  nft_trans_rule(trans),
8084                                                  NFT_TRANS_COMMIT);
8085                         break;
8086                 case NFT_MSG_NEWSET:
8087                         nft_clear(net, nft_trans_set(trans));
8088                         /* This avoids hitting -EBUSY when deleting the table
8089                          * from the transaction.
8090                          */
8091                         if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8092                             !list_empty(&nft_trans_set(trans)->bindings))
8093                                 trans->ctx.table->use--;
8094
8095                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8096                                              NFT_MSG_NEWSET, GFP_KERNEL);
8097                         nft_trans_destroy(trans);
8098                         break;
8099                 case NFT_MSG_DELSET:
8100                         list_del_rcu(&nft_trans_set(trans)->list);
8101                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8102                                              NFT_MSG_DELSET, GFP_KERNEL);
8103                         break;
8104                 case NFT_MSG_NEWSETELEM:
8105                         te = (struct nft_trans_elem *)trans->data;
8106
8107                         te->set->ops->activate(net, te->set, &te->elem);
8108                         nf_tables_setelem_notify(&trans->ctx, te->set,
8109                                                  &te->elem,
8110                                                  NFT_MSG_NEWSETELEM, 0);
8111                         nft_trans_destroy(trans);
8112                         break;
8113                 case NFT_MSG_DELSETELEM:
8114                         te = (struct nft_trans_elem *)trans->data;
8115
8116                         nf_tables_setelem_notify(&trans->ctx, te->set,
8117                                                  &te->elem,
8118                                                  NFT_MSG_DELSETELEM, 0);
8119                         te->set->ops->remove(net, te->set, &te->elem);
8120                         atomic_dec(&te->set->nelems);
8121                         te->set->ndeact--;
8122                         break;
8123                 case NFT_MSG_NEWOBJ:
8124                         if (nft_trans_obj_update(trans)) {
8125                                 nft_obj_commit_update(trans);
8126                                 nf_tables_obj_notify(&trans->ctx,
8127                                                      nft_trans_obj(trans),
8128                                                      NFT_MSG_NEWOBJ);
8129                         } else {
8130                                 nft_clear(net, nft_trans_obj(trans));
8131                                 nf_tables_obj_notify(&trans->ctx,
8132                                                      nft_trans_obj(trans),
8133                                                      NFT_MSG_NEWOBJ);
8134                                 nft_trans_destroy(trans);
8135                         }
8136                         break;
8137                 case NFT_MSG_DELOBJ:
8138                         nft_obj_del(nft_trans_obj(trans));
8139                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8140                                              NFT_MSG_DELOBJ);
8141                         break;
8142                 case NFT_MSG_NEWFLOWTABLE:
8143                         if (nft_trans_flowtable_update(trans)) {
8144                                 nf_tables_flowtable_notify(&trans->ctx,
8145                                                            nft_trans_flowtable(trans),
8146                                                            &nft_trans_flowtable_hooks(trans),
8147                                                            NFT_MSG_NEWFLOWTABLE);
8148                                 list_splice(&nft_trans_flowtable_hooks(trans),
8149                                             &nft_trans_flowtable(trans)->hook_list);
8150                         } else {
8151                                 nft_clear(net, nft_trans_flowtable(trans));
8152                                 nf_tables_flowtable_notify(&trans->ctx,
8153                                                            nft_trans_flowtable(trans),
8154                                                            &nft_trans_flowtable(trans)->hook_list,
8155                                                            NFT_MSG_NEWFLOWTABLE);
8156                         }
8157                         nft_trans_destroy(trans);
8158                         break;
8159                 case NFT_MSG_DELFLOWTABLE:
8160                         if (nft_trans_flowtable_update(trans)) {
8161                                 nft_flowtable_hooks_del(nft_trans_flowtable(trans),
8162                                                         &nft_trans_flowtable_hooks(trans));
8163                                 nf_tables_flowtable_notify(&trans->ctx,
8164                                                            nft_trans_flowtable(trans),
8165                                                            &nft_trans_flowtable_hooks(trans),
8166                                                            NFT_MSG_DELFLOWTABLE);
8167                                 nft_unregister_flowtable_net_hooks(net,
8168                                                                    &nft_trans_flowtable_hooks(trans));
8169                         } else {
8170                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8171                                 nf_tables_flowtable_notify(&trans->ctx,
8172                                                            nft_trans_flowtable(trans),
8173                                                            &nft_trans_flowtable(trans)->hook_list,
8174                                                            NFT_MSG_DELFLOWTABLE);
8175                                 nft_unregister_flowtable_net_hooks(net,
8176                                                 &nft_trans_flowtable(trans)->hook_list);
8177                         }
8178                         break;
8179                 }
8180         }
8181
8182         nft_commit_notify(net, NETLINK_CB(skb).portid);
8183         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8184         nf_tables_commit_release(net);
8185
8186         return 0;
8187 }
8188
8189 static void nf_tables_module_autoload(struct net *net)
8190 {
8191         struct nft_module_request *req, *next;
8192         LIST_HEAD(module_list);
8193
8194         list_splice_init(&net->nft.module_list, &module_list);
8195         mutex_unlock(&net->nft.commit_mutex);
8196         list_for_each_entry_safe(req, next, &module_list, list) {
8197                 request_module("%s", req->module);
8198                 req->done = true;
8199         }
8200         mutex_lock(&net->nft.commit_mutex);
8201         list_splice(&module_list, &net->nft.module_list);
8202 }
8203
8204 static void nf_tables_abort_release(struct nft_trans *trans)
8205 {
8206         switch (trans->msg_type) {
8207         case NFT_MSG_NEWTABLE:
8208                 nf_tables_table_destroy(&trans->ctx);
8209                 break;
8210         case NFT_MSG_NEWCHAIN:
8211                 nf_tables_chain_destroy(&trans->ctx);
8212                 break;
8213         case NFT_MSG_NEWRULE:
8214                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8215                 break;
8216         case NFT_MSG_NEWSET:
8217                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8218                 break;
8219         case NFT_MSG_NEWSETELEM:
8220                 nft_set_elem_destroy(nft_trans_elem_set(trans),
8221                                      nft_trans_elem(trans).priv, true);
8222                 break;
8223         case NFT_MSG_NEWOBJ:
8224                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8225                 break;
8226         case NFT_MSG_NEWFLOWTABLE:
8227                 if (nft_trans_flowtable_update(trans))
8228                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8229                 else
8230                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8231                 break;
8232         }
8233         kfree(trans);
8234 }
8235
8236 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
8237 {
8238         struct nft_trans *trans, *next;
8239         struct nft_trans_elem *te;
8240         struct nft_hook *hook;
8241
8242         if (action == NFNL_ABORT_VALIDATE &&
8243             nf_tables_validate(net) < 0)
8244                 return -EAGAIN;
8245
8246         list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
8247                                          list) {
8248                 switch (trans->msg_type) {
8249                 case NFT_MSG_NEWTABLE:
8250                         if (nft_trans_table_update(trans)) {
8251                                 if (nft_trans_table_enable(trans)) {
8252                                         nf_tables_table_disable(net,
8253                                                                 trans->ctx.table);
8254                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8255                                 }
8256                                 nft_trans_destroy(trans);
8257                         } else {
8258                                 list_del_rcu(&trans->ctx.table->list);
8259                         }
8260                         break;
8261                 case NFT_MSG_DELTABLE:
8262                         nft_clear(trans->ctx.net, trans->ctx.table);
8263                         nft_trans_destroy(trans);
8264                         break;
8265                 case NFT_MSG_NEWCHAIN:
8266                         if (nft_trans_chain_update(trans)) {
8267                                 free_percpu(nft_trans_chain_stats(trans));
8268                                 kfree(nft_trans_chain_name(trans));
8269                                 nft_trans_destroy(trans);
8270                         } else {
8271                                 if (nft_chain_is_bound(trans->ctx.chain)) {
8272                                         nft_trans_destroy(trans);
8273                                         break;
8274                                 }
8275                                 trans->ctx.table->use--;
8276                                 nft_chain_del(trans->ctx.chain);
8277                                 nf_tables_unregister_hook(trans->ctx.net,
8278                                                           trans->ctx.table,
8279                                                           trans->ctx.chain);
8280                         }
8281                         break;
8282                 case NFT_MSG_DELCHAIN:
8283                         trans->ctx.table->use++;
8284                         nft_clear(trans->ctx.net, trans->ctx.chain);
8285                         nft_trans_destroy(trans);
8286                         break;
8287                 case NFT_MSG_NEWRULE:
8288                         trans->ctx.chain->use--;
8289                         list_del_rcu(&nft_trans_rule(trans)->list);
8290                         nft_rule_expr_deactivate(&trans->ctx,
8291                                                  nft_trans_rule(trans),
8292                                                  NFT_TRANS_ABORT);
8293                         break;
8294                 case NFT_MSG_DELRULE:
8295                         trans->ctx.chain->use++;
8296                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8297                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
8298                         nft_trans_destroy(trans);
8299                         break;
8300                 case NFT_MSG_NEWSET:
8301                         trans->ctx.table->use--;
8302                         if (nft_trans_set_bound(trans)) {
8303                                 nft_trans_destroy(trans);
8304                                 break;
8305                         }
8306                         list_del_rcu(&nft_trans_set(trans)->list);
8307                         break;
8308                 case NFT_MSG_DELSET:
8309                         trans->ctx.table->use++;
8310                         nft_clear(trans->ctx.net, nft_trans_set(trans));
8311                         nft_trans_destroy(trans);
8312                         break;
8313                 case NFT_MSG_NEWSETELEM:
8314                         if (nft_trans_elem_set_bound(trans)) {
8315                                 nft_trans_destroy(trans);
8316                                 break;
8317                         }
8318                         te = (struct nft_trans_elem *)trans->data;
8319                         te->set->ops->remove(net, te->set, &te->elem);
8320                         atomic_dec(&te->set->nelems);
8321                         break;
8322                 case NFT_MSG_DELSETELEM:
8323                         te = (struct nft_trans_elem *)trans->data;
8324
8325                         nft_set_elem_activate(net, te->set, &te->elem);
8326                         te->set->ops->activate(net, te->set, &te->elem);
8327                         te->set->ndeact--;
8328
8329                         nft_trans_destroy(trans);
8330                         break;
8331                 case NFT_MSG_NEWOBJ:
8332                         if (nft_trans_obj_update(trans)) {
8333                                 kfree(nft_trans_obj_newobj(trans));
8334                                 nft_trans_destroy(trans);
8335                         } else {
8336                                 trans->ctx.table->use--;
8337                                 nft_obj_del(nft_trans_obj(trans));
8338                         }
8339                         break;
8340                 case NFT_MSG_DELOBJ:
8341                         trans->ctx.table->use++;
8342                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
8343                         nft_trans_destroy(trans);
8344                         break;
8345                 case NFT_MSG_NEWFLOWTABLE:
8346                         if (nft_trans_flowtable_update(trans)) {
8347                                 nft_unregister_flowtable_net_hooks(net,
8348                                                 &nft_trans_flowtable_hooks(trans));
8349                         } else {
8350                                 trans->ctx.table->use--;
8351                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8352                                 nft_unregister_flowtable_net_hooks(net,
8353                                                 &nft_trans_flowtable(trans)->hook_list);
8354                         }
8355                         break;
8356                 case NFT_MSG_DELFLOWTABLE:
8357                         if (nft_trans_flowtable_update(trans)) {
8358                                 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
8359                                         hook->inactive = false;
8360                         } else {
8361                                 trans->ctx.table->use++;
8362                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
8363                         }
8364                         nft_trans_destroy(trans);
8365                         break;
8366                 }
8367         }
8368
8369         synchronize_rcu();
8370
8371         list_for_each_entry_safe_reverse(trans, next,
8372                                          &net->nft.commit_list, list) {
8373                 list_del(&trans->list);
8374                 nf_tables_abort_release(trans);
8375         }
8376
8377         if (action == NFNL_ABORT_AUTOLOAD)
8378                 nf_tables_module_autoload(net);
8379         else
8380                 nf_tables_module_autoload_cleanup(net);
8381
8382         return 0;
8383 }
8384
8385 static void nf_tables_cleanup(struct net *net)
8386 {
8387         nft_validate_state_update(net, NFT_VALIDATE_SKIP);
8388 }
8389
8390 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
8391                            enum nfnl_abort_action action)
8392 {
8393         int ret = __nf_tables_abort(net, action);
8394
8395         mutex_unlock(&net->nft.commit_mutex);
8396
8397         return ret;
8398 }
8399
8400 static bool nf_tables_valid_genid(struct net *net, u32 genid)
8401 {
8402         bool genid_ok;
8403
8404         mutex_lock(&net->nft.commit_mutex);
8405
8406         genid_ok = genid == 0 || net->nft.base_seq == genid;
8407         if (!genid_ok)
8408                 mutex_unlock(&net->nft.commit_mutex);
8409
8410         /* else, commit mutex has to be released by commit or abort function */
8411         return genid_ok;
8412 }
8413
8414 static const struct nfnetlink_subsystem nf_tables_subsys = {
8415         .name           = "nf_tables",
8416         .subsys_id      = NFNL_SUBSYS_NFTABLES,
8417         .cb_count       = NFT_MSG_MAX,
8418         .cb             = nf_tables_cb,
8419         .commit         = nf_tables_commit,
8420         .abort          = nf_tables_abort,
8421         .cleanup        = nf_tables_cleanup,
8422         .valid_genid    = nf_tables_valid_genid,
8423         .owner          = THIS_MODULE,
8424 };
8425
8426 int nft_chain_validate_dependency(const struct nft_chain *chain,
8427                                   enum nft_chain_types type)
8428 {
8429         const struct nft_base_chain *basechain;
8430
8431         if (nft_is_base_chain(chain)) {
8432                 basechain = nft_base_chain(chain);
8433                 if (basechain->type->type != type)
8434                         return -EOPNOTSUPP;
8435         }
8436         return 0;
8437 }
8438 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
8439
8440 int nft_chain_validate_hooks(const struct nft_chain *chain,
8441                              unsigned int hook_flags)
8442 {
8443         struct nft_base_chain *basechain;
8444
8445         if (nft_is_base_chain(chain)) {
8446                 basechain = nft_base_chain(chain);
8447
8448                 if ((1 << basechain->ops.hooknum) & hook_flags)
8449                         return 0;
8450
8451                 return -EOPNOTSUPP;
8452         }
8453
8454         return 0;
8455 }
8456 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
8457
8458 /*
8459  * Loop detection - walk through the ruleset beginning at the destination chain
8460  * of a new jump until either the source chain is reached (loop) or all
8461  * reachable chains have been traversed.
8462  *
8463  * The loop check is performed whenever a new jump verdict is added to an
8464  * expression or verdict map or a verdict map is bound to a new chain.
8465  */
8466
8467 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8468                                  const struct nft_chain *chain);
8469
8470 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
8471                                         struct nft_set *set,
8472                                         const struct nft_set_iter *iter,
8473                                         struct nft_set_elem *elem)
8474 {
8475         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
8476         const struct nft_data *data;
8477
8478         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
8479             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
8480                 return 0;
8481
8482         data = nft_set_ext_data(ext);
8483         switch (data->verdict.code) {
8484         case NFT_JUMP:
8485         case NFT_GOTO:
8486                 return nf_tables_check_loops(ctx, data->verdict.chain);
8487         default:
8488                 return 0;
8489         }
8490 }
8491
8492 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8493                                  const struct nft_chain *chain)
8494 {
8495         const struct nft_rule *rule;
8496         const struct nft_expr *expr, *last;
8497         struct nft_set *set;
8498         struct nft_set_binding *binding;
8499         struct nft_set_iter iter;
8500
8501         if (ctx->chain == chain)
8502                 return -ELOOP;
8503
8504         list_for_each_entry(rule, &chain->rules, list) {
8505                 nft_rule_for_each_expr(expr, last, rule) {
8506                         struct nft_immediate_expr *priv;
8507                         const struct nft_data *data;
8508                         int err;
8509
8510                         if (strcmp(expr->ops->type->name, "immediate"))
8511                                 continue;
8512
8513                         priv = nft_expr_priv(expr);
8514                         if (priv->dreg != NFT_REG_VERDICT)
8515                                 continue;
8516
8517                         data = &priv->data;
8518                         switch (data->verdict.code) {
8519                         case NFT_JUMP:
8520                         case NFT_GOTO:
8521                                 err = nf_tables_check_loops(ctx,
8522                                                         data->verdict.chain);
8523                                 if (err < 0)
8524                                         return err;
8525                         default:
8526                                 break;
8527                         }
8528                 }
8529         }
8530
8531         list_for_each_entry(set, &ctx->table->sets, list) {
8532                 if (!nft_is_active_next(ctx->net, set))
8533                         continue;
8534                 if (!(set->flags & NFT_SET_MAP) ||
8535                     set->dtype != NFT_DATA_VERDICT)
8536                         continue;
8537
8538                 list_for_each_entry(binding, &set->bindings, list) {
8539                         if (!(binding->flags & NFT_SET_MAP) ||
8540                             binding->chain != chain)
8541                                 continue;
8542
8543                         iter.genmask    = nft_genmask_next(ctx->net);
8544                         iter.skip       = 0;
8545                         iter.count      = 0;
8546                         iter.err        = 0;
8547                         iter.fn         = nf_tables_loop_check_setelem;
8548
8549                         set->ops->walk(ctx, set, &iter);
8550                         if (iter.err < 0)
8551                                 return iter.err;
8552                 }
8553         }
8554
8555         return 0;
8556 }
8557
8558 /**
8559  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
8560  *
8561  *      @attr: netlink attribute to fetch value from
8562  *      @max: maximum value to be stored in dest
8563  *      @dest: pointer to the variable
8564  *
8565  *      Parse, check and store a given u32 netlink attribute into variable.
8566  *      This function returns -ERANGE if the value goes over maximum value.
8567  *      Otherwise a 0 is returned and the attribute value is stored in the
8568  *      destination variable.
8569  */
8570 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
8571 {
8572         u32 val;
8573
8574         val = ntohl(nla_get_be32(attr));
8575         if (val > max)
8576                 return -ERANGE;
8577
8578         *dest = val;
8579         return 0;
8580 }
8581 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
8582
8583 /**
8584  *      nft_parse_register - parse a register value from a netlink attribute
8585  *
8586  *      @attr: netlink attribute
8587  *
8588  *      Parse and translate a register value from a netlink attribute.
8589  *      Registers used to be 128 bit wide, these register numbers will be
8590  *      mapped to the corresponding 32 bit register numbers.
8591  */
8592 unsigned int nft_parse_register(const struct nlattr *attr)
8593 {
8594         unsigned int reg;
8595
8596         reg = ntohl(nla_get_be32(attr));
8597         switch (reg) {
8598         case NFT_REG_VERDICT...NFT_REG_4:
8599                 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
8600         default:
8601                 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
8602         }
8603 }
8604 EXPORT_SYMBOL_GPL(nft_parse_register);
8605
8606 /**
8607  *      nft_dump_register - dump a register value to a netlink attribute
8608  *
8609  *      @skb: socket buffer
8610  *      @attr: attribute number
8611  *      @reg: register number
8612  *
8613  *      Construct a netlink attribute containing the register number. For
8614  *      compatibility reasons, register numbers being a multiple of 4 are
8615  *      translated to the corresponding 128 bit register numbers.
8616  */
8617 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
8618 {
8619         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
8620                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
8621         else
8622                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
8623
8624         return nla_put_be32(skb, attr, htonl(reg));
8625 }
8626 EXPORT_SYMBOL_GPL(nft_dump_register);
8627
8628 /**
8629  *      nft_validate_register_load - validate a load from a register
8630  *
8631  *      @reg: the register number
8632  *      @len: the length of the data
8633  *
8634  *      Validate that the input register is one of the general purpose
8635  *      registers and that the length of the load is within the bounds.
8636  */
8637 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
8638 {
8639         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8640                 return -EINVAL;
8641         if (len == 0)
8642                 return -EINVAL;
8643         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
8644                 return -ERANGE;
8645
8646         return 0;
8647 }
8648 EXPORT_SYMBOL_GPL(nft_validate_register_load);
8649
8650 /**
8651  *      nft_validate_register_store - validate an expressions' register store
8652  *
8653  *      @ctx: context of the expression performing the load
8654  *      @reg: the destination register number
8655  *      @data: the data to load
8656  *      @type: the data type
8657  *      @len: the length of the data
8658  *
8659  *      Validate that a data load uses the appropriate data type for
8660  *      the destination register and the length is within the bounds.
8661  *      A value of NULL for the data means that its runtime gathered
8662  *      data.
8663  */
8664 int nft_validate_register_store(const struct nft_ctx *ctx,
8665                                 enum nft_registers reg,
8666                                 const struct nft_data *data,
8667                                 enum nft_data_types type, unsigned int len)
8668 {
8669         int err;
8670
8671         switch (reg) {
8672         case NFT_REG_VERDICT:
8673                 if (type != NFT_DATA_VERDICT)
8674                         return -EINVAL;
8675
8676                 if (data != NULL &&
8677                     (data->verdict.code == NFT_GOTO ||
8678                      data->verdict.code == NFT_JUMP)) {
8679                         err = nf_tables_check_loops(ctx, data->verdict.chain);
8680                         if (err < 0)
8681                                 return err;
8682                 }
8683
8684                 return 0;
8685         default:
8686                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8687                         return -EINVAL;
8688                 if (len == 0)
8689                         return -EINVAL;
8690                 if (reg * NFT_REG32_SIZE + len >
8691                     sizeof_field(struct nft_regs, data))
8692                         return -ERANGE;
8693
8694                 if (data != NULL && type != NFT_DATA_VALUE)
8695                         return -EINVAL;
8696                 return 0;
8697         }
8698 }
8699 EXPORT_SYMBOL_GPL(nft_validate_register_store);
8700
8701 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
8702         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
8703         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
8704                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
8705         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
8706 };
8707
8708 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
8709                             struct nft_data_desc *desc, const struct nlattr *nla)
8710 {
8711         u8 genmask = nft_genmask_next(ctx->net);
8712         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
8713         struct nft_chain *chain;
8714         int err;
8715
8716         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
8717                                           nft_verdict_policy, NULL);
8718         if (err < 0)
8719                 return err;
8720
8721         if (!tb[NFTA_VERDICT_CODE])
8722                 return -EINVAL;
8723         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
8724
8725         switch (data->verdict.code) {
8726         default:
8727                 switch (data->verdict.code & NF_VERDICT_MASK) {
8728                 case NF_ACCEPT:
8729                 case NF_DROP:
8730                 case NF_QUEUE:
8731                         break;
8732                 default:
8733                         return -EINVAL;
8734                 }
8735                 fallthrough;
8736         case NFT_CONTINUE:
8737         case NFT_BREAK:
8738         case NFT_RETURN:
8739                 break;
8740         case NFT_JUMP:
8741         case NFT_GOTO:
8742                 if (tb[NFTA_VERDICT_CHAIN]) {
8743                         chain = nft_chain_lookup(ctx->net, ctx->table,
8744                                                  tb[NFTA_VERDICT_CHAIN],
8745                                                  genmask);
8746                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
8747                         chain = nft_chain_lookup_byid(ctx->net,
8748                                                       tb[NFTA_VERDICT_CHAIN_ID]);
8749                         if (IS_ERR(chain))
8750                                 return PTR_ERR(chain);
8751                 } else {
8752                         return -EINVAL;
8753                 }
8754
8755                 if (IS_ERR(chain))
8756                         return PTR_ERR(chain);
8757                 if (nft_is_base_chain(chain))
8758                         return -EOPNOTSUPP;
8759
8760                 chain->use++;
8761                 data->verdict.chain = chain;
8762                 break;
8763         }
8764
8765         desc->len = sizeof(data->verdict);
8766         desc->type = NFT_DATA_VERDICT;
8767         return 0;
8768 }
8769
8770 static void nft_verdict_uninit(const struct nft_data *data)
8771 {
8772         struct nft_chain *chain;
8773         struct nft_rule *rule;
8774
8775         switch (data->verdict.code) {
8776         case NFT_JUMP:
8777         case NFT_GOTO:
8778                 chain = data->verdict.chain;
8779                 chain->use--;
8780
8781                 if (!nft_chain_is_bound(chain))
8782                         break;
8783
8784                 chain->table->use--;
8785                 list_for_each_entry(rule, &chain->rules, list)
8786                         chain->use--;
8787
8788                 nft_chain_del(chain);
8789                 break;
8790         }
8791 }
8792
8793 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
8794 {
8795         struct nlattr *nest;
8796
8797         nest = nla_nest_start_noflag(skb, type);
8798         if (!nest)
8799                 goto nla_put_failure;
8800
8801         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
8802                 goto nla_put_failure;
8803
8804         switch (v->code) {
8805         case NFT_JUMP:
8806         case NFT_GOTO:
8807                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
8808                                    v->chain->name))
8809                         goto nla_put_failure;
8810         }
8811         nla_nest_end(skb, nest);
8812         return 0;
8813
8814 nla_put_failure:
8815         return -1;
8816 }
8817
8818 static int nft_value_init(const struct nft_ctx *ctx,
8819                           struct nft_data *data, unsigned int size,
8820                           struct nft_data_desc *desc, const struct nlattr *nla)
8821 {
8822         unsigned int len;
8823
8824         len = nla_len(nla);
8825         if (len == 0)
8826                 return -EINVAL;
8827         if (len > size)
8828                 return -EOVERFLOW;
8829
8830         nla_memcpy(data->data, nla, len);
8831         desc->type = NFT_DATA_VALUE;
8832         desc->len  = len;
8833         return 0;
8834 }
8835
8836 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
8837                           unsigned int len)
8838 {
8839         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
8840 }
8841
8842 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
8843         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
8844         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
8845 };
8846
8847 /**
8848  *      nft_data_init - parse nf_tables data netlink attributes
8849  *
8850  *      @ctx: context of the expression using the data
8851  *      @data: destination struct nft_data
8852  *      @size: maximum data length
8853  *      @desc: data description
8854  *      @nla: netlink attribute containing data
8855  *
8856  *      Parse the netlink data attributes and initialize a struct nft_data.
8857  *      The type and length of data are returned in the data description.
8858  *
8859  *      The caller can indicate that it only wants to accept data of type
8860  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
8861  */
8862 int nft_data_init(const struct nft_ctx *ctx,
8863                   struct nft_data *data, unsigned int size,
8864                   struct nft_data_desc *desc, const struct nlattr *nla)
8865 {
8866         struct nlattr *tb[NFTA_DATA_MAX + 1];
8867         int err;
8868
8869         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
8870                                           nft_data_policy, NULL);
8871         if (err < 0)
8872                 return err;
8873
8874         if (tb[NFTA_DATA_VALUE])
8875                 return nft_value_init(ctx, data, size, desc,
8876                                       tb[NFTA_DATA_VALUE]);
8877         if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
8878                 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
8879         return -EINVAL;
8880 }
8881 EXPORT_SYMBOL_GPL(nft_data_init);
8882
8883 /**
8884  *      nft_data_release - release a nft_data item
8885  *
8886  *      @data: struct nft_data to release
8887  *      @type: type of data
8888  *
8889  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
8890  *      all others need to be released by calling this function.
8891  */
8892 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
8893 {
8894         if (type < NFT_DATA_VERDICT)
8895                 return;
8896         switch (type) {
8897         case NFT_DATA_VERDICT:
8898                 return nft_verdict_uninit(data);
8899         default:
8900                 WARN_ON(1);
8901         }
8902 }
8903 EXPORT_SYMBOL_GPL(nft_data_release);
8904
8905 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
8906                   enum nft_data_types type, unsigned int len)
8907 {
8908         struct nlattr *nest;
8909         int err;
8910
8911         nest = nla_nest_start_noflag(skb, attr);
8912         if (nest == NULL)
8913                 return -1;
8914
8915         switch (type) {
8916         case NFT_DATA_VALUE:
8917                 err = nft_value_dump(skb, data, len);
8918                 break;
8919         case NFT_DATA_VERDICT:
8920                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
8921                 break;
8922         default:
8923                 err = -EINVAL;
8924                 WARN_ON(1);
8925         }
8926
8927         nla_nest_end(skb, nest);
8928         return err;
8929 }
8930 EXPORT_SYMBOL_GPL(nft_data_dump);
8931
8932 int __nft_release_basechain(struct nft_ctx *ctx)
8933 {
8934         struct nft_rule *rule, *nr;
8935
8936         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
8937                 return 0;
8938
8939         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
8940         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
8941                 list_del(&rule->list);
8942                 ctx->chain->use--;
8943                 nf_tables_rule_release(ctx, rule);
8944         }
8945         nft_chain_del(ctx->chain);
8946         ctx->table->use--;
8947         nf_tables_chain_destroy(ctx);
8948
8949         return 0;
8950 }
8951 EXPORT_SYMBOL_GPL(__nft_release_basechain);
8952
8953 static void __nft_release_tables(struct net *net)
8954 {
8955         struct nft_flowtable *flowtable, *nf;
8956         struct nft_table *table, *nt;
8957         struct nft_chain *chain, *nc;
8958         struct nft_object *obj, *ne;
8959         struct nft_rule *rule, *nr;
8960         struct nft_set *set, *ns;
8961         struct nft_ctx ctx = {
8962                 .net    = net,
8963                 .family = NFPROTO_NETDEV,
8964         };
8965
8966         list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
8967                 ctx.family = table->family;
8968
8969                 list_for_each_entry(chain, &table->chains, list)
8970                         nf_tables_unregister_hook(net, table, chain);
8971                 /* No packets are walking on these chains anymore. */
8972                 ctx.table = table;
8973                 list_for_each_entry(chain, &table->chains, list) {
8974                         ctx.chain = chain;
8975                         list_for_each_entry_safe(rule, nr, &chain->rules, list) {
8976                                 list_del(&rule->list);
8977                                 chain->use--;
8978                                 nf_tables_rule_release(&ctx, rule);
8979                         }
8980                 }
8981                 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
8982                         list_del(&flowtable->list);
8983                         table->use--;
8984                         nf_tables_flowtable_destroy(flowtable);
8985                 }
8986                 list_for_each_entry_safe(set, ns, &table->sets, list) {
8987                         list_del(&set->list);
8988                         table->use--;
8989                         nft_set_destroy(&ctx, set);
8990                 }
8991                 list_for_each_entry_safe(obj, ne, &table->objects, list) {
8992                         nft_obj_del(obj);
8993                         table->use--;
8994                         nft_obj_destroy(&ctx, obj);
8995                 }
8996                 list_for_each_entry_safe(chain, nc, &table->chains, list) {
8997                         ctx.chain = chain;
8998                         nft_chain_del(chain);
8999                         table->use--;
9000                         nf_tables_chain_destroy(&ctx);
9001                 }
9002                 list_del(&table->list);
9003                 nf_tables_table_destroy(&ctx);
9004         }
9005 }
9006
9007 static int __net_init nf_tables_init_net(struct net *net)
9008 {
9009         INIT_LIST_HEAD(&net->nft.tables);
9010         INIT_LIST_HEAD(&net->nft.commit_list);
9011         INIT_LIST_HEAD(&net->nft.module_list);
9012         INIT_LIST_HEAD(&net->nft.notify_list);
9013         mutex_init(&net->nft.commit_mutex);
9014         net->nft.base_seq = 1;
9015         net->nft.validate_state = NFT_VALIDATE_SKIP;
9016
9017         return 0;
9018 }
9019
9020 static void __net_exit nf_tables_exit_net(struct net *net)
9021 {
9022         mutex_lock(&net->nft.commit_mutex);
9023         if (!list_empty(&net->nft.commit_list))
9024                 __nf_tables_abort(net, NFNL_ABORT_NONE);
9025         __nft_release_tables(net);
9026         mutex_unlock(&net->nft.commit_mutex);
9027         WARN_ON_ONCE(!list_empty(&net->nft.tables));
9028         WARN_ON_ONCE(!list_empty(&net->nft.module_list));
9029         WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
9030 }
9031
9032 static struct pernet_operations nf_tables_net_ops = {
9033         .init   = nf_tables_init_net,
9034         .exit   = nf_tables_exit_net,
9035 };
9036
9037 static int __init nf_tables_module_init(void)
9038 {
9039         int err;
9040
9041         spin_lock_init(&nf_tables_destroy_list_lock);
9042         err = register_pernet_subsys(&nf_tables_net_ops);
9043         if (err < 0)
9044                 return err;
9045
9046         err = nft_chain_filter_init();
9047         if (err < 0)
9048                 goto err1;
9049
9050         err = nf_tables_core_module_init();
9051         if (err < 0)
9052                 goto err2;
9053
9054         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
9055         if (err < 0)
9056                 goto err3;
9057
9058         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
9059         if (err < 0)
9060                 goto err4;
9061
9062         err = nft_offload_init();
9063         if (err < 0)
9064                 goto err5;
9065
9066         /* must be last */
9067         err = nfnetlink_subsys_register(&nf_tables_subsys);
9068         if (err < 0)
9069                 goto err6;
9070
9071         nft_chain_route_init();
9072
9073         return err;
9074 err6:
9075         nft_offload_exit();
9076 err5:
9077         rhltable_destroy(&nft_objname_ht);
9078 err4:
9079         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9080 err3:
9081         nf_tables_core_module_exit();
9082 err2:
9083         nft_chain_filter_fini();
9084 err1:
9085         unregister_pernet_subsys(&nf_tables_net_ops);
9086         return err;
9087 }
9088
9089 static void __exit nf_tables_module_exit(void)
9090 {
9091         nfnetlink_subsys_unregister(&nf_tables_subsys);
9092         nft_offload_exit();
9093         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9094         nft_chain_filter_fini();
9095         nft_chain_route_fini();
9096         unregister_pernet_subsys(&nf_tables_net_ops);
9097         cancel_work_sync(&trans_destroy_work);
9098         rcu_barrier();
9099         rhltable_destroy(&nft_objname_ht);
9100         nf_tables_core_module_exit();
9101 }
9102
9103 module_init(nf_tables_module_init);
9104 module_exit(nf_tables_module_exit);
9105
9106 MODULE_LICENSE("GPL");
9107 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
9108 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);