net/netfilter/nf_tables_api.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
   4  *
   5  * Development of this code funded by Astaro AG (http://www.astaro.com/)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/list.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/netlink.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/rhashtable.h>
  15 #include <linux/audit.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter/nfnetlink.h>
  18 #include <linux/netfilter/nf_tables.h>
  19 #include <net/netfilter/nf_flow_table.h>
  20 #include <net/netfilter/nf_tables_core.h>
  21 #include <net/netfilter/nf_tables.h>
  22 #include <net/netfilter/nf_tables_offload.h>
  23 #include <net/net_namespace.h>
  24 #include <net/sock.h>
  25
  26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
  27
  28 unsigned int nf_tables_net_id __read_mostly;
  29
  30 static LIST_HEAD(nf_tables_expressions);
  31 static LIST_HEAD(nf_tables_objects);
  32 static LIST_HEAD(nf_tables_flowtables);
  33 static LIST_HEAD(nf_tables_destroy_list);
  34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  35 static u64 table_handle;
  36
  37 enum {
  38         NFT_VALIDATE_SKIP       = 0,
  39         NFT_VALIDATE_NEED,
  40         NFT_VALIDATE_DO,
  41 };
  42
  43 static struct rhltable nft_objname_ht;
  44
  45 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  46 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  47 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  48
  49 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  50 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  51 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  52
  53 static const struct rhashtable_params nft_chain_ht_params = {
  54         .head_offset            = offsetof(struct nft_chain, rhlhead),
  55         .key_offset             = offsetof(struct nft_chain, name),
  56         .hashfn                 = nft_chain_hash,
  57         .obj_hashfn             = nft_chain_hash_obj,
  58         .obj_cmpfn              = nft_chain_hash_cmp,
  59         .automatic_shrinking    = true,
  60 };
  61
  62 static const struct rhashtable_params nft_objname_ht_params = {
  63         .head_offset            = offsetof(struct nft_object, rhlhead),
  64         .key_offset             = offsetof(struct nft_object, key),
  65         .hashfn                 = nft_objname_hash,
  66         .obj_hashfn             = nft_objname_hash_obj,
  67         .obj_cmpfn              = nft_objname_hash_cmp,
  68         .automatic_shrinking    = true,
  69 };
  70
  71 struct nft_audit_data {
  72         struct nft_table *table;
  73         int entries;
  74         int op;
  75         struct list_head list;
  76 };
  77
  78 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  79         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  80         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  81         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  82         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  83         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  84         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  85         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  86         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  87         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  88         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  89         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  90         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  91         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  92         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  93         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  94         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  95         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  96         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  97         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
  98         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
  99         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
 100         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 101         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 102         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 103         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 104 };
 105
 106 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
 107 {
 108         struct nftables_pernet *nft_net = nft_pernet(net);
 109
 110         switch (nft_net->validate_state) {
 111         case NFT_VALIDATE_SKIP:
 112                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 113                 break;
 114         case NFT_VALIDATE_NEED:
 115                 break;
 116         case NFT_VALIDATE_DO:
 117                 if (new_validate_state == NFT_VALIDATE_NEED)
 118                         return;
 119         }
 120
 121         nft_net->validate_state = new_validate_state;
 122 }
 123 static void nf_tables_trans_destroy_work(struct work_struct *w);
 124 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 125
 126 static void nft_ctx_init(struct nft_ctx *ctx,
 127                          struct net *net,
 128                          const struct sk_buff *skb,
 129                          const struct nlmsghdr *nlh,
 130                          u8 family,
 131                          struct nft_table *table,
 132                          struct nft_chain *chain,
 133                          const struct nlattr * const *nla)
 134 {
 135         ctx->net        = net;
 136         ctx->family     = family;
 137         ctx->level      = 0;
 138         ctx->table      = table;
 139         ctx->chain      = chain;
 140         ctx->nla        = nla;
 141         ctx->portid     = NETLINK_CB(skb).portid;
 142         ctx->report     = nlmsg_report(nlh);
 143         ctx->flags      = nlh->nlmsg_flags;
 144         ctx->seq        = nlh->nlmsg_seq;
 145 }
 146
 147 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 148                                              int msg_type, u32 size, gfp_t gfp)
 149 {
 150         struct nft_trans *trans;
 151
 152         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 153         if (trans == NULL)
 154                 return NULL;
 155
 156         trans->msg_type = msg_type;
 157         trans->ctx      = *ctx;
 158
 159         return trans;
 160 }
 161
 162 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 163                                          int msg_type, u32 size)
 164 {
 165         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 166 }
 167
 168 static void nft_trans_destroy(struct nft_trans *trans)
 169 {
 170         list_del(&trans->list);
 171         kfree(trans);
 172 }
 173
 174 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 175 {
 176         struct nftables_pernet *nft_net;
 177         struct net *net = ctx->net;
 178         struct nft_trans *trans;
 179
 180         if (!nft_set_is_anonymous(set))
 181                 return;
 182
 183         nft_net = nft_pernet(net);
 184         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 185                 switch (trans->msg_type) {
 186                 case NFT_MSG_NEWSET:
 187                         if (nft_trans_set(trans) == set)
 188                                 nft_trans_set_bound(trans) = true;
 189                         break;
 190                 case NFT_MSG_NEWSETELEM:
 191                         if (nft_trans_elem_set(trans) == set)
 192                                 nft_trans_elem_set_bound(trans) = true;
 193                         break;
 194                 }
 195         }
 196 }
 197
 198 static int nft_netdev_register_hooks(struct net *net,
 199                                      struct list_head *hook_list)
 200 {
 201         struct nft_hook *hook;
 202         int err, j;
 203
 204         j = 0;
 205         list_for_each_entry(hook, hook_list, list) {
 206                 err = nf_register_net_hook(net, &hook->ops);
 207                 if (err < 0)
 208                         goto err_register;
 209
 210                 j++;
 211         }
 212         return 0;
 213
 214 err_register:
 215         list_for_each_entry(hook, hook_list, list) {
 216                 if (j-- <= 0)
 217                         break;
 218
 219                 nf_unregister_net_hook(net, &hook->ops);
 220         }
 221         return err;
 222 }
 223
 224 static void nft_netdev_unregister_hooks(struct net *net,
 225                                         struct list_head *hook_list)
 226 {
 227         struct nft_hook *hook;
 228
 229         list_for_each_entry(hook, hook_list, list)
 230                 nf_unregister_net_hook(net, &hook->ops);
 231 }
 232
 233 static int nf_tables_register_hook(struct net *net,
 234                                    const struct nft_table *table,
 235                                    struct nft_chain *chain)
 236 {
 237         struct nft_base_chain *basechain;
 238         const struct nf_hook_ops *ops;
 239
 240         if (table->flags & NFT_TABLE_F_DORMANT ||
 241             !nft_is_base_chain(chain))
 242                 return 0;
 243
 244         basechain = nft_base_chain(chain);
 245         ops = &basechain->ops;
 246
 247         if (basechain->type->ops_register)
 248                 return basechain->type->ops_register(net, ops);
 249
 250         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 251                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 252
 253         return nf_register_net_hook(net, &basechain->ops);
 254 }
 255
 256 static void nf_tables_unregister_hook(struct net *net,
 257                                       const struct nft_table *table,
 258                                       struct nft_chain *chain)
 259 {
 260         struct nft_base_chain *basechain;
 261         const struct nf_hook_ops *ops;
 262
 263         if (table->flags & NFT_TABLE_F_DORMANT ||
 264             !nft_is_base_chain(chain))
 265                 return;
 266         basechain = nft_base_chain(chain);
 267         ops = &basechain->ops;
 268
 269         if (basechain->type->ops_unregister)
 270                 return basechain->type->ops_unregister(net, ops);
 271
 272         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 273                 nft_netdev_unregister_hooks(net, &basechain->hook_list);
 274         else
 275                 nf_unregister_net_hook(net, &basechain->ops);
 276 }
 277
 278 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 279 {
 280         struct nftables_pernet *nft_net = nft_pernet(net);
 281
 282         list_add_tail(&trans->list, &nft_net->commit_list);
 283 }
 284
 285 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 286 {
 287         struct nft_trans *trans;
 288
 289         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 290         if (trans == NULL)
 291                 return -ENOMEM;
 292
 293         if (msg_type == NFT_MSG_NEWTABLE)
 294                 nft_activate_next(ctx->net, ctx->table);
 295
 296         nft_trans_commit_list_add_tail(ctx->net, trans);
 297         return 0;
 298 }
 299
 300 static int nft_deltable(struct nft_ctx *ctx)
 301 {
 302         int err;
 303
 304         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 305         if (err < 0)
 306                 return err;
 307
 308         nft_deactivate_next(ctx->net, ctx->table);
 309         return err;
 310 }
 311
 312 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 313 {
 314         struct nft_trans *trans;
 315
 316         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 317         if (trans == NULL)
 318                 return ERR_PTR(-ENOMEM);
 319
 320         if (msg_type == NFT_MSG_NEWCHAIN) {
 321                 nft_activate_next(ctx->net, ctx->chain);
 322
 323                 if (ctx->nla[NFTA_CHAIN_ID]) {
 324                         nft_trans_chain_id(trans) =
 325                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 326                 }
 327         }
 328
 329         nft_trans_commit_list_add_tail(ctx->net, trans);
 330         return trans;
 331 }
 332
 333 static int nft_delchain(struct nft_ctx *ctx)
 334 {
 335         struct nft_trans *trans;
 336
 337         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 338         if (IS_ERR(trans))
 339                 return PTR_ERR(trans);
 340
 341         ctx->table->use--;
 342         nft_deactivate_next(ctx->net, ctx->chain);
 343
 344         return 0;
 345 }
 346
 347 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
 348                                    struct nft_rule *rule)
 349 {
 350         struct nft_expr *expr;
 351
 352         expr = nft_expr_first(rule);
 353         while (nft_expr_more(rule, expr)) {
 354                 if (expr->ops->activate)
 355                         expr->ops->activate(ctx, expr);
 356
 357                 expr = nft_expr_next(expr);
 358         }
 359 }
 360
 361 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
 362                                      struct nft_rule *rule,
 363                                      enum nft_trans_phase phase)
 364 {
 365         struct nft_expr *expr;
 366
 367         expr = nft_expr_first(rule);
 368         while (nft_expr_more(rule, expr)) {
 369                 if (expr->ops->deactivate)
 370                         expr->ops->deactivate(ctx, expr, phase);
 371
 372                 expr = nft_expr_next(expr);
 373         }
 374 }
 375
 376 static int
 377 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 378 {
 379         /* You cannot delete the same rule twice */
 380         if (nft_is_active_next(ctx->net, rule)) {
 381                 nft_deactivate_next(ctx->net, rule);
 382                 ctx->chain->use--;
 383                 return 0;
 384         }
 385         return -ENOENT;
 386 }
 387
 388 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 389                                             struct nft_rule *rule)
 390 {
 391         struct nft_trans *trans;
 392
 393         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 394         if (trans == NULL)
 395                 return NULL;
 396
 397         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 398                 nft_trans_rule_id(trans) =
 399                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 400         }
 401         nft_trans_rule(trans) = rule;
 402         nft_trans_commit_list_add_tail(ctx->net, trans);
 403
 404         return trans;
 405 }
 406
 407 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 408 {
 409         struct nft_flow_rule *flow;
 410         struct nft_trans *trans;
 411         int err;
 412
 413         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 414         if (trans == NULL)
 415                 return -ENOMEM;
 416
 417         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 418                 flow = nft_flow_rule_create(ctx->net, rule);
 419                 if (IS_ERR(flow)) {
 420                         nft_trans_destroy(trans);
 421                         return PTR_ERR(flow);
 422                 }
 423
 424                 nft_trans_flow_rule(trans) = flow;
 425         }
 426
 427         err = nf_tables_delrule_deactivate(ctx, rule);
 428         if (err < 0) {
 429                 nft_trans_destroy(trans);
 430                 return err;
 431         }
 432         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 433
 434         return 0;
 435 }
 436
 437 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 438 {
 439         struct nft_rule *rule;
 440         int err;
 441
 442         list_for_each_entry(rule, &ctx->chain->rules, list) {
 443                 if (!nft_is_active_next(ctx->net, rule))
 444                         continue;
 445
 446                 err = nft_delrule(ctx, rule);
 447                 if (err < 0)
 448                         return err;
 449         }
 450         return 0;
 451 }
 452
 453 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 454                              struct nft_set *set)
 455 {
 456         struct nft_trans *trans;
 457
 458         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 459         if (trans == NULL)
 460                 return -ENOMEM;
 461
 462         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
 463                 nft_trans_set_id(trans) =
 464                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 465                 nft_activate_next(ctx->net, set);
 466         }
 467         nft_trans_set(trans) = set;
 468         nft_trans_commit_list_add_tail(ctx->net, trans);
 469
 470         return 0;
 471 }
 472
 473 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 474 {
 475         int err;
 476
 477         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 478         if (err < 0)
 479                 return err;
 480
 481         nft_deactivate_next(ctx->net, set);
 482         ctx->table->use--;
 483
 484         return err;
 485 }
 486
 487 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 488                              struct nft_object *obj)
 489 {
 490         struct nft_trans *trans;
 491
 492         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 493         if (trans == NULL)
 494                 return -ENOMEM;
 495
 496         if (msg_type == NFT_MSG_NEWOBJ)
 497                 nft_activate_next(ctx->net, obj);
 498
 499         nft_trans_obj(trans) = obj;
 500         nft_trans_commit_list_add_tail(ctx->net, trans);
 501
 502         return 0;
 503 }
 504
 505 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 506 {
 507         int err;
 508
 509         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 510         if (err < 0)
 511                 return err;
 512
 513         nft_deactivate_next(ctx->net, obj);
 514         ctx->table->use--;
 515
 516         return err;
 517 }
 518
 519 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 520                                    struct nft_flowtable *flowtable)
 521 {
 522         struct nft_trans *trans;
 523
 524         trans = nft_trans_alloc(ctx, msg_type,
 525                                 sizeof(struct nft_trans_flowtable));
 526         if (trans == NULL)
 527                 return -ENOMEM;
 528
 529         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 530                 nft_activate_next(ctx->net, flowtable);
 531
 532         nft_trans_flowtable(trans) = flowtable;
 533         nft_trans_commit_list_add_tail(ctx->net, trans);
 534
 535         return 0;
 536 }
 537
 538 static int nft_delflowtable(struct nft_ctx *ctx,
 539                             struct nft_flowtable *flowtable)
 540 {
 541         int err;
 542
 543         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 544         if (err < 0)
 545                 return err;
 546
 547         nft_deactivate_next(ctx->net, flowtable);
 548         ctx->table->use--;
 549
 550         return err;
 551 }
 552
 553 /*
 554  * Tables
 555  */
 556
 557 static struct nft_table *nft_table_lookup(const struct net *net,
 558                                           const struct nlattr *nla,
 559                                           u8 family, u8 genmask, u32 nlpid)
 560 {
 561         struct nftables_pernet *nft_net;
 562         struct nft_table *table;
 563
 564         if (nla == NULL)
 565                 return ERR_PTR(-EINVAL);
 566
 567         nft_net = nft_pernet(net);
 568         list_for_each_entry_rcu(table, &nft_net->tables, list,
 569                                 lockdep_is_held(&nft_net->commit_mutex)) {
 570                 if (!nla_strcmp(nla, table->name) &&
 571                     table->family == family &&
 572                     nft_active_genmask(table, genmask)) {
 573                         if (nft_table_has_owner(table) &&
 574                             table->nlpid != nlpid)
 575                                 return ERR_PTR(-EPERM);
 576
 577                         return table;
 578                 }
 579         }
 580
 581         return ERR_PTR(-ENOENT);
 582 }
 583
 584 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 585                                                    const struct nlattr *nla,
 586                                                    u8 genmask)
 587 {
 588         struct nftables_pernet *nft_net;
 589         struct nft_table *table;
 590
 591         nft_net = nft_pernet(net);
 592         list_for_each_entry(table, &nft_net->tables, list) {
 593                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 594                     nft_active_genmask(table, genmask))
 595                         return table;
 596         }
 597
 598         return ERR_PTR(-ENOENT);
 599 }
 600
 601 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 602 {
 603         return ++table->hgenerator;
 604 }
 605
 606 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 607
 608 static const struct nft_chain_type *
 609 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 610 {
 611         if (family >= NFPROTO_NUMPROTO ||
 612             type >= NFT_CHAIN_T_MAX)
 613                 return NULL;
 614
 615         return chain_type[family][type];
 616 }
 617
 618 static const struct nft_chain_type *
 619 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 620 {
 621         const struct nft_chain_type *type;
 622         int i;
 623
 624         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 625                 type = __nft_chain_type_get(family, i);
 626                 if (!type)
 627                         continue;
 628                 if (!nla_strcmp(nla, type->name))
 629                         return type;
 630         }
 631         return NULL;
 632 }
 633
 634 struct nft_module_request {
 635         struct list_head        list;
 636         char                    module[MODULE_NAME_LEN];
 637         bool                    done;
 638 };
 639
 640 #ifdef CONFIG_MODULES
 641 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 642                                       ...)
 643 {
 644         char module_name[MODULE_NAME_LEN];
 645         struct nftables_pernet *nft_net;
 646         struct nft_module_request *req;
 647         va_list args;
 648         int ret;
 649
 650         va_start(args, fmt);
 651         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 652         va_end(args);
 653         if (ret >= MODULE_NAME_LEN)
 654                 return 0;
 655
 656         nft_net = nft_pernet(net);
 657         list_for_each_entry(req, &nft_net->module_list, list) {
 658                 if (!strcmp(req->module, module_name)) {
 659                         if (req->done)
 660                                 return 0;
 661
 662                         /* A request to load this module already exists. */
 663                         return -EAGAIN;
 664                 }
 665         }
 666
 667         req = kmalloc(sizeof(*req), GFP_KERNEL);
 668         if (!req)
 669                 return -ENOMEM;
 670
 671         req->done = false;
 672         strlcpy(req->module, module_name, MODULE_NAME_LEN);
 673         list_add_tail(&req->list, &nft_net->module_list);
 674
 675         return -EAGAIN;
 676 }
 677 EXPORT_SYMBOL_GPL(nft_request_module);
 678 #endif
 679
 680 static void lockdep_nfnl_nft_mutex_not_held(void)
 681 {
 682 #ifdef CONFIG_PROVE_LOCKING
 683         if (debug_locks)
 684                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 685 #endif
 686 }
 687
 688 static const struct nft_chain_type *
 689 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 690                             u8 family, bool autoload)
 691 {
 692         const struct nft_chain_type *type;
 693
 694         type = __nf_tables_chain_type_lookup(nla, family);
 695         if (type != NULL)
 696                 return type;
 697
 698         lockdep_nfnl_nft_mutex_not_held();
 699 #ifdef CONFIG_MODULES
 700         if (autoload) {
 701                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 702                                        nla_len(nla),
 703                                        (const char *)nla_data(nla)) == -EAGAIN)
 704                         return ERR_PTR(-EAGAIN);
 705         }
 706 #endif
 707         return ERR_PTR(-ENOENT);
 708 }
 709
 710 static __be16 nft_base_seq(const struct net *net)
 711 {
 712         struct nftables_pernet *nft_net = nft_pernet(net);
 713
 714         return htons(nft_net->base_seq & 0xffff);
 715 }
 716
 717 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 718         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 719                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 720         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 721         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 722         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 723                                     .len = NFT_USERDATA_MAXLEN }
 724 };
 725
 726 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 727                                      u32 portid, u32 seq, int event, u32 flags,
 728                                      int family, const struct nft_table *table)
 729 {
 730         struct nlmsghdr *nlh;
 731
 732         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 733         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 734                            NFNETLINK_V0, nft_base_seq(net));
 735         if (!nlh)
 736                 goto nla_put_failure;
 737
 738         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 739             nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
 740             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 741             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 742                          NFTA_TABLE_PAD))
 743                 goto nla_put_failure;
 744         if (nft_table_has_owner(table) &&
 745             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 746                 goto nla_put_failure;
 747
 748         if (table->udata) {
 749                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 750                         goto nla_put_failure;
 751         }
 752
 753         nlmsg_end(skb, nlh);
 754         return 0;
 755
 756 nla_put_failure:
 757         nlmsg_trim(skb, nlh);
 758         return -1;
 759 }
 760
 761 struct nftnl_skb_parms {
 762         bool report;
 763 };
 764 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 765
 766 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 767                                struct list_head *notify_list)
 768 {
 769         NFT_CB(skb).report = report;
 770         list_add_tail(&skb->list, notify_list);
 771 }
 772
 773 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 774 {
 775         struct nftables_pernet *nft_net;
 776         struct sk_buff *skb;
 777         int err;
 778
 779         if (!ctx->report &&
 780             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 781                 return;
 782
 783         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 784         if (skb == NULL)
 785                 goto err;
 786
 787         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 788                                         event, 0, ctx->family, ctx->table);
 789         if (err < 0) {
 790                 kfree_skb(skb);
 791                 goto err;
 792         }
 793
 794         nft_net = nft_pernet(ctx->net);
 795         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
 796         return;
 797 err:
 798         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 799 }
 800
 801 static int nf_tables_dump_tables(struct sk_buff *skb,
 802                                  struct netlink_callback *cb)
 803 {
 804         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 805         struct nftables_pernet *nft_net;
 806         const struct nft_table *table;
 807         unsigned int idx = 0, s_idx = cb->args[0];
 808         struct net *net = sock_net(skb->sk);
 809         int family = nfmsg->nfgen_family;
 810
 811         rcu_read_lock();
 812         nft_net = nft_pernet(net);
 813         cb->seq = nft_net->base_seq;
 814
 815         list_for_each_entry_rcu(table, &nft_net->tables, list) {
 816                 if (family != NFPROTO_UNSPEC && family != table->family)
 817                         continue;
 818
 819                 if (idx < s_idx)
 820                         goto cont;
 821                 if (idx > s_idx)
 822                         memset(&cb->args[1], 0,
 823                                sizeof(cb->args) - sizeof(cb->args[0]));
 824                 if (!nft_is_active(net, table))
 825                         continue;
 826                 if (nf_tables_fill_table_info(skb, net,
 827                                               NETLINK_CB(cb->skb).portid,
 828                                               cb->nlh->nlmsg_seq,
 829                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 830                                               table->family, table) < 0)
 831                         goto done;
 832
 833                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 834 cont:
 835                 idx++;
 836         }
 837 done:
 838         rcu_read_unlock();
 839         cb->args[0] = idx;
 840         return skb->len;
 841 }
 842
 843 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 844                                       const struct nlmsghdr *nlh,
 845                                       struct netlink_dump_control *c)
 846 {
 847         int err;
 848
 849         if (!try_module_get(THIS_MODULE))
 850                 return -EINVAL;
 851
 852         rcu_read_unlock();
 853         err = netlink_dump_start(nlsk, skb, nlh, c);
 854         rcu_read_lock();
 855         module_put(THIS_MODULE);
 856
 857         return err;
 858 }
 859
 860 /* called with rcu_read_lock held */
 861 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
 862                               const struct nlattr * const nla[])
 863 {
 864         const struct nfgenmsg *nfmsg = nlmsg_data(info->nlh);
 865         struct netlink_ext_ack *extack = info->extack;
 866         u8 genmask = nft_genmask_cur(info->net);
 867         int family = nfmsg->nfgen_family;
 868         const struct nft_table *table;
 869         struct net *net = info->net;
 870         struct sk_buff *skb2;
 871         int err;
 872
 873         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
 874                 struct netlink_dump_control c = {
 875                         .dump = nf_tables_dump_tables,
 876                         .module = THIS_MODULE,
 877                 };
 878
 879                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
 880         }
 881
 882         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
 883         if (IS_ERR(table)) {
 884                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 885                 return PTR_ERR(table);
 886         }
 887
 888         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 889         if (!skb2)
 890                 return -ENOMEM;
 891
 892         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 893                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
 894                                         0, family, table);
 895         if (err < 0)
 896                 goto err_fill_table_info;
 897
 898         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 899
 900 err_fill_table_info:
 901         kfree_skb(skb2);
 902         return err;
 903 }
 904
 905 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
 906 {
 907         struct nft_chain *chain;
 908         u32 i = 0;
 909
 910         list_for_each_entry(chain, &table->chains, list) {
 911                 if (!nft_is_active_next(net, chain))
 912                         continue;
 913                 if (!nft_is_base_chain(chain))
 914                         continue;
 915
 916                 if (cnt && i++ == cnt)
 917                         break;
 918
 919                 nf_tables_unregister_hook(net, table, chain);
 920         }
 921 }
 922
 923 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
 924 {
 925         struct nft_chain *chain;
 926         int err, i = 0;
 927
 928         list_for_each_entry(chain, &table->chains, list) {
 929                 if (!nft_is_active_next(net, chain))
 930                         continue;
 931                 if (!nft_is_base_chain(chain))
 932                         continue;
 933
 934                 err = nf_tables_register_hook(net, table, chain);
 935                 if (err < 0)
 936                         goto err_register_hooks;
 937
 938                 i++;
 939         }
 940         return 0;
 941
 942 err_register_hooks:
 943         if (i)
 944                 nft_table_disable(net, table, i);
 945         return err;
 946 }
 947
 948 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
 949 {
 950         nft_table_disable(net, table, 0);
 951 }
 952
 953 enum {
 954         NFT_TABLE_STATE_UNCHANGED       = 0,
 955         NFT_TABLE_STATE_DORMANT,
 956         NFT_TABLE_STATE_WAKEUP
 957 };
 958
 959 static int nf_tables_updtable(struct nft_ctx *ctx)
 960 {
 961         struct nft_trans *trans;
 962         u32 flags;
 963         int ret = 0;
 964
 965         if (!ctx->nla[NFTA_TABLE_FLAGS])
 966                 return 0;
 967
 968         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
 969         if (flags & ~NFT_TABLE_F_MASK)
 970                 return -EOPNOTSUPP;
 971
 972         if (flags == ctx->table->flags)
 973                 return 0;
 974
 975         if ((nft_table_has_owner(ctx->table) &&
 976              !(flags & NFT_TABLE_F_OWNER)) ||
 977             (!nft_table_has_owner(ctx->table) &&
 978              flags & NFT_TABLE_F_OWNER))
 979                 return -EOPNOTSUPP;
 980
 981         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
 982                                 sizeof(struct nft_trans_table));
 983         if (trans == NULL)
 984                 return -ENOMEM;
 985
 986         if ((flags & NFT_TABLE_F_DORMANT) &&
 987             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
 988                 nft_trans_table_state(trans) = NFT_TABLE_STATE_DORMANT;
 989         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
 990                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
 991                 ret = nf_tables_table_enable(ctx->net, ctx->table);
 992                 if (ret >= 0)
 993                         nft_trans_table_state(trans) = NFT_TABLE_STATE_WAKEUP;
 994         }
 995         if (ret < 0)
 996                 goto err;
 997
 998         nft_trans_table_flags(trans) = flags;
 999         nft_trans_table_update(trans) = true;
1000         nft_trans_commit_list_add_tail(ctx->net, trans);
1001         return 0;
1002 err:
1003         nft_trans_destroy(trans);
1004         return ret;
1005 }
1006
1007 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1008 {
1009         const char *name = data;
1010
1011         return jhash(name, strlen(name), seed);
1012 }
1013
1014 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1015 {
1016         const struct nft_chain *chain = data;
1017
1018         return nft_chain_hash(chain->name, 0, seed);
1019 }
1020
1021 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1022                               const void *ptr)
1023 {
1024         const struct nft_chain *chain = ptr;
1025         const char *name = arg->key;
1026
1027         return strcmp(chain->name, name);
1028 }
1029
1030 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1031 {
1032         const struct nft_object_hash_key *k = data;
1033
1034         seed ^= hash_ptr(k->table, 32);
1035
1036         return jhash(k->name, strlen(k->name), seed);
1037 }
1038
1039 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1040 {
1041         const struct nft_object *obj = data;
1042
1043         return nft_objname_hash(&obj->key, 0, seed);
1044 }
1045
1046 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1047                                 const void *ptr)
1048 {
1049         const struct nft_object_hash_key *k = arg->key;
1050         const struct nft_object *obj = ptr;
1051
1052         if (obj->key.table != k->table)
1053                 return -1;
1054
1055         return strcmp(obj->key.name, k->name);
1056 }
1057
1058 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1059                               const struct nlattr * const nla[])
1060 {
1061         struct nftables_pernet *nft_net = nft_pernet(info->net);
1062         const struct nfgenmsg *nfmsg = nlmsg_data(info->nlh);
1063         struct netlink_ext_ack *extack = info->extack;
1064         u8 genmask = nft_genmask_next(info->net);
1065         int family = nfmsg->nfgen_family;
1066         struct net *net = info->net;
1067         const struct nlattr *attr;
1068         struct nft_table *table;
1069         struct nft_ctx ctx;
1070         u32 flags = 0;
1071         int err;
1072
1073         lockdep_assert_held(&nft_net->commit_mutex);
1074         attr = nla[NFTA_TABLE_NAME];
1075         table = nft_table_lookup(net, attr, family, genmask,
1076                                  NETLINK_CB(skb).portid);
1077         if (IS_ERR(table)) {
1078                 if (PTR_ERR(table) != -ENOENT)
1079                         return PTR_ERR(table);
1080         } else {
1081                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1082                         NL_SET_BAD_ATTR(extack, attr);
1083                         return -EEXIST;
1084                 }
1085                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1086                         return -EOPNOTSUPP;
1087
1088                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1089
1090                 return nf_tables_updtable(&ctx);
1091         }
1092
1093         if (nla[NFTA_TABLE_FLAGS]) {
1094                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1095                 if (flags & ~NFT_TABLE_F_MASK)
1096                         return -EOPNOTSUPP;
1097         }
1098
1099         err = -ENOMEM;
1100         table = kzalloc(sizeof(*table), GFP_KERNEL);
1101         if (table == NULL)
1102                 goto err_kzalloc;
1103
1104         table->name = nla_strdup(attr, GFP_KERNEL);
1105         if (table->name == NULL)
1106                 goto err_strdup;
1107
1108         if (nla[NFTA_TABLE_USERDATA]) {
1109                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL);
1110                 if (table->udata == NULL)
1111                         goto err_table_udata;
1112
1113                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1114         }
1115
1116         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1117         if (err)
1118                 goto err_chain_ht;
1119
1120         INIT_LIST_HEAD(&table->chains);
1121         INIT_LIST_HEAD(&table->sets);
1122         INIT_LIST_HEAD(&table->objects);
1123         INIT_LIST_HEAD(&table->flowtables);
1124         table->family = family;
1125         table->flags = flags;
1126         table->handle = ++table_handle;
1127         if (table->flags & NFT_TABLE_F_OWNER)
1128                 table->nlpid = NETLINK_CB(skb).portid;
1129
1130         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1131         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1132         if (err < 0)
1133                 goto err_trans;
1134
1135         list_add_tail_rcu(&table->list, &nft_net->tables);
1136         return 0;
1137 err_trans:
1138         rhltable_destroy(&table->chains_ht);
1139 err_chain_ht:
1140         kfree(table->udata);
1141 err_table_udata:
1142         kfree(table->name);
1143 err_strdup:
1144         kfree(table);
1145 err_kzalloc:
1146         return err;
1147 }
1148
1149 static int nft_flush_table(struct nft_ctx *ctx)
1150 {
1151         struct nft_flowtable *flowtable, *nft;
1152         struct nft_chain *chain, *nc;
1153         struct nft_object *obj, *ne;
1154         struct nft_set *set, *ns;
1155         int err;
1156
1157         list_for_each_entry(chain, &ctx->table->chains, list) {
1158                 if (!nft_is_active_next(ctx->net, chain))
1159                         continue;
1160
1161                 if (nft_chain_is_bound(chain))
1162                         continue;
1163
1164                 ctx->chain = chain;
1165
1166                 err = nft_delrule_by_chain(ctx);
1167                 if (err < 0)
1168                         goto out;
1169         }
1170
1171         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1172                 if (!nft_is_active_next(ctx->net, set))
1173                         continue;
1174
1175                 if (nft_set_is_anonymous(set) &&
1176                     !list_empty(&set->bindings))
1177                         continue;
1178
1179                 err = nft_delset(ctx, set);
1180                 if (err < 0)
1181                         goto out;
1182         }
1183
1184         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1185                 if (!nft_is_active_next(ctx->net, flowtable))
1186                         continue;
1187
1188                 err = nft_delflowtable(ctx, flowtable);
1189                 if (err < 0)
1190                         goto out;
1191         }
1192
1193         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1194                 if (!nft_is_active_next(ctx->net, obj))
1195                         continue;
1196
1197                 err = nft_delobj(ctx, obj);
1198                 if (err < 0)
1199                         goto out;
1200         }
1201
1202         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1203                 if (!nft_is_active_next(ctx->net, chain))
1204                         continue;
1205
1206                 if (nft_chain_is_bound(chain))
1207                         continue;
1208
1209                 ctx->chain = chain;
1210
1211                 err = nft_delchain(ctx);
1212                 if (err < 0)
1213                         goto out;
1214         }
1215
1216         err = nft_deltable(ctx);
1217 out:
1218         return err;
1219 }
1220
1221 static int nft_flush(struct nft_ctx *ctx, int family)
1222 {
1223         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1224         const struct nlattr * const *nla = ctx->nla;
1225         struct nft_table *table, *nt;
1226         int err = 0;
1227
1228         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1229                 if (family != AF_UNSPEC && table->family != family)
1230                         continue;
1231
1232                 ctx->family = table->family;
1233
1234                 if (!nft_is_active_next(ctx->net, table))
1235                         continue;
1236
1237                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1238                         continue;
1239
1240                 if (nla[NFTA_TABLE_NAME] &&
1241                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1242                         continue;
1243
1244                 ctx->table = table;
1245
1246                 err = nft_flush_table(ctx);
1247                 if (err < 0)
1248                         goto out;
1249         }
1250 out:
1251         return err;
1252 }
1253
1254 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1255                               const struct nlattr * const nla[])
1256 {
1257         const struct nfgenmsg *nfmsg = nlmsg_data(info->nlh);
1258         struct netlink_ext_ack *extack = info->extack;
1259         u8 genmask = nft_genmask_next(info->net);
1260         int family = nfmsg->nfgen_family;
1261         struct net *net = info->net;
1262         const struct nlattr *attr;
1263         struct nft_table *table;
1264         struct nft_ctx ctx;
1265
1266         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1267         if (family == AF_UNSPEC ||
1268             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1269                 return nft_flush(&ctx, family);
1270
1271         if (nla[NFTA_TABLE_HANDLE]) {
1272                 attr = nla[NFTA_TABLE_HANDLE];
1273                 table = nft_table_lookup_byhandle(net, attr, genmask);
1274         } else {
1275                 attr = nla[NFTA_TABLE_NAME];
1276                 table = nft_table_lookup(net, attr, family, genmask,
1277                                          NETLINK_CB(skb).portid);
1278         }
1279
1280         if (IS_ERR(table)) {
1281                 NL_SET_BAD_ATTR(extack, attr);
1282                 return PTR_ERR(table);
1283         }
1284
1285         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1286             table->use > 0)
1287                 return -EBUSY;
1288
1289         ctx.family = family;
1290         ctx.table = table;
1291
1292         return nft_flush_table(&ctx);
1293 }
1294
1295 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1296 {
1297         if (WARN_ON(ctx->table->use > 0))
1298                 return;
1299
1300         rhltable_destroy(&ctx->table->chains_ht);
1301         kfree(ctx->table->name);
1302         kfree(ctx->table->udata);
1303         kfree(ctx->table);
1304 }
1305
1306 void nft_register_chain_type(const struct nft_chain_type *ctype)
1307 {
1308         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1309         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1310                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1311                 return;
1312         }
1313         chain_type[ctype->family][ctype->type] = ctype;
1314         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1315 }
1316 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1317
1318 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1319 {
1320         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1321         chain_type[ctype->family][ctype->type] = NULL;
1322         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1323 }
1324 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1325
1326 /*
1327  * Chains
1328  */
1329
1330 static struct nft_chain *
1331 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1332 {
1333         struct nft_chain *chain;
1334
1335         list_for_each_entry(chain, &table->chains, list) {
1336                 if (chain->handle == handle &&
1337                     nft_active_genmask(chain, genmask))
1338                         return chain;
1339         }
1340
1341         return ERR_PTR(-ENOENT);
1342 }
1343
1344 static bool lockdep_commit_lock_is_held(const struct net *net)
1345 {
1346 #ifdef CONFIG_PROVE_LOCKING
1347         struct nftables_pernet *nft_net = nft_pernet(net);
1348
1349         return lockdep_is_held(&nft_net->commit_mutex);
1350 #else
1351         return true;
1352 #endif
1353 }
1354
1355 static struct nft_chain *nft_chain_lookup(struct net *net,
1356                                           struct nft_table *table,
1357                                           const struct nlattr *nla, u8 genmask)
1358 {
1359         char search[NFT_CHAIN_MAXNAMELEN + 1];
1360         struct rhlist_head *tmp, *list;
1361         struct nft_chain *chain;
1362
1363         if (nla == NULL)
1364                 return ERR_PTR(-EINVAL);
1365
1366         nla_strscpy(search, nla, sizeof(search));
1367
1368         WARN_ON(!rcu_read_lock_held() &&
1369                 !lockdep_commit_lock_is_held(net));
1370
1371         chain = ERR_PTR(-ENOENT);
1372         rcu_read_lock();
1373         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1374         if (!list)
1375                 goto out_unlock;
1376
1377         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1378                 if (nft_active_genmask(chain, genmask))
1379                         goto out_unlock;
1380         }
1381         chain = ERR_PTR(-ENOENT);
1382 out_unlock:
1383         rcu_read_unlock();
1384         return chain;
1385 }
1386
1387 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1388         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1389                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1390         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1391         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1392                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1393         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1394         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1395         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1396                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1397         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1398         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1399         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1400         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1401                                     .len = NFT_USERDATA_MAXLEN },
1402 };
1403
1404 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1405         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1406         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1407         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1408                                     .len = IFNAMSIZ - 1 },
1409 };
1410
1411 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1412 {
1413         struct nft_stats *cpu_stats, total;
1414         struct nlattr *nest;
1415         unsigned int seq;
1416         u64 pkts, bytes;
1417         int cpu;
1418
1419         if (!stats)
1420                 return 0;
1421
1422         memset(&total, 0, sizeof(total));
1423         for_each_possible_cpu(cpu) {
1424                 cpu_stats = per_cpu_ptr(stats, cpu);
1425                 do {
1426                         seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1427                         pkts = cpu_stats->pkts;
1428                         bytes = cpu_stats->bytes;
1429                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1430                 total.pkts += pkts;
1431                 total.bytes += bytes;
1432         }
1433         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1434         if (nest == NULL)
1435                 goto nla_put_failure;
1436
1437         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1438                          NFTA_COUNTER_PAD) ||
1439             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1440                          NFTA_COUNTER_PAD))
1441                 goto nla_put_failure;
1442
1443         nla_nest_end(skb, nest);
1444         return 0;
1445
1446 nla_put_failure:
1447         return -ENOSPC;
1448 }
1449
1450 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1451                                    const struct nft_base_chain *basechain)
1452 {
1453         const struct nf_hook_ops *ops = &basechain->ops;
1454         struct nft_hook *hook, *first = NULL;
1455         struct nlattr *nest, *nest_devs;
1456         int n = 0;
1457
1458         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1459         if (nest == NULL)
1460                 goto nla_put_failure;
1461         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1462                 goto nla_put_failure;
1463         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1464                 goto nla_put_failure;
1465
1466         if (nft_base_chain_netdev(family, ops->hooknum)) {
1467                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1468                 list_for_each_entry(hook, &basechain->hook_list, list) {
1469                         if (!first)
1470                                 first = hook;
1471
1472                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1473                                            hook->ops.dev->name))
1474                                 goto nla_put_failure;
1475                         n++;
1476                 }
1477                 nla_nest_end(skb, nest_devs);
1478
1479                 if (n == 1 &&
1480                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1481                         goto nla_put_failure;
1482         }
1483         nla_nest_end(skb, nest);
1484
1485         return 0;
1486 nla_put_failure:
1487         return -1;
1488 }
1489
1490 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1491                                      u32 portid, u32 seq, int event, u32 flags,
1492                                      int family, const struct nft_table *table,
1493                                      const struct nft_chain *chain)
1494 {
1495         struct nlmsghdr *nlh;
1496
1497         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1498         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1499                            NFNETLINK_V0, nft_base_seq(net));
1500         if (!nlh)
1501                 goto nla_put_failure;
1502
1503         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1504                 goto nla_put_failure;
1505         if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1506                          NFTA_CHAIN_PAD))
1507                 goto nla_put_failure;
1508         if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1509                 goto nla_put_failure;
1510
1511         if (nft_is_base_chain(chain)) {
1512                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1513                 struct nft_stats __percpu *stats;
1514
1515                 if (nft_dump_basechain_hook(skb, family, basechain))
1516                         goto nla_put_failure;
1517
1518                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1519                                  htonl(basechain->policy)))
1520                         goto nla_put_failure;
1521
1522                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1523                         goto nla_put_failure;
1524
1525                 stats = rcu_dereference_check(basechain->stats,
1526                                               lockdep_commit_lock_is_held(net));
1527                 if (nft_dump_stats(skb, stats))
1528                         goto nla_put_failure;
1529         }
1530
1531         if (chain->flags &&
1532             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1533                 goto nla_put_failure;
1534
1535         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1536                 goto nla_put_failure;
1537
1538         if (chain->udata &&
1539             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1540                 goto nla_put_failure;
1541
1542         nlmsg_end(skb, nlh);
1543         return 0;
1544
1545 nla_put_failure:
1546         nlmsg_trim(skb, nlh);
1547         return -1;
1548 }
1549
1550 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1551 {
1552         struct nftables_pernet *nft_net;
1553         struct sk_buff *skb;
1554         int err;
1555
1556         if (!ctx->report &&
1557             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1558                 return;
1559
1560         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1561         if (skb == NULL)
1562                 goto err;
1563
1564         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1565                                         event, 0, ctx->family, ctx->table,
1566                                         ctx->chain);
1567         if (err < 0) {
1568                 kfree_skb(skb);
1569                 goto err;
1570         }
1571
1572         nft_net = nft_pernet(ctx->net);
1573         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1574         return;
1575 err:
1576         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1577 }
1578
1579 static int nf_tables_dump_chains(struct sk_buff *skb,
1580                                  struct netlink_callback *cb)
1581 {
1582         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1583         unsigned int idx = 0, s_idx = cb->args[0];
1584         struct net *net = sock_net(skb->sk);
1585         int family = nfmsg->nfgen_family;
1586         struct nftables_pernet *nft_net;
1587         const struct nft_table *table;
1588         const struct nft_chain *chain;
1589
1590         rcu_read_lock();
1591         nft_net = nft_pernet(net);
1592         cb->seq = nft_net->base_seq;
1593
1594         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1595                 if (family != NFPROTO_UNSPEC && family != table->family)
1596                         continue;
1597
1598                 list_for_each_entry_rcu(chain, &table->chains, list) {
1599                         if (idx < s_idx)
1600                                 goto cont;
1601                         if (idx > s_idx)
1602                                 memset(&cb->args[1], 0,
1603                                        sizeof(cb->args) - sizeof(cb->args[0]));
1604                         if (!nft_is_active(net, chain))
1605                                 continue;
1606                         if (nf_tables_fill_chain_info(skb, net,
1607                                                       NETLINK_CB(cb->skb).portid,
1608                                                       cb->nlh->nlmsg_seq,
1609                                                       NFT_MSG_NEWCHAIN,
1610                                                       NLM_F_MULTI,
1611                                                       table->family, table,
1612                                                       chain) < 0)
1613                                 goto done;
1614
1615                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1616 cont:
1617                         idx++;
1618                 }
1619         }
1620 done:
1621         rcu_read_unlock();
1622         cb->args[0] = idx;
1623         return skb->len;
1624 }
1625
1626 /* called with rcu_read_lock held */
1627 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1628                               const struct nlattr * const nla[])
1629 {
1630         const struct nfgenmsg *nfmsg = nlmsg_data(info->nlh);
1631         struct netlink_ext_ack *extack = info->extack;
1632         u8 genmask = nft_genmask_cur(info->net);
1633         int family = nfmsg->nfgen_family;
1634         const struct nft_chain *chain;
1635         struct net *net = info->net;
1636         struct nft_table *table;
1637         struct sk_buff *skb2;
1638         int err;
1639
1640         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1641                 struct netlink_dump_control c = {
1642                         .dump = nf_tables_dump_chains,
1643                         .module = THIS_MODULE,
1644                 };
1645
1646                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1647         }
1648
1649         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1650         if (IS_ERR(table)) {
1651                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1652                 return PTR_ERR(table);
1653         }
1654
1655         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1656         if (IS_ERR(chain)) {
1657                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1658                 return PTR_ERR(chain);
1659         }
1660
1661         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1662         if (!skb2)
1663                 return -ENOMEM;
1664
1665         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1666                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1667                                         0, family, table, chain);
1668         if (err < 0)
1669                 goto err_fill_chain_info;
1670
1671         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1672
1673 err_fill_chain_info:
1674         kfree_skb(skb2);
1675         return err;
1676 }
1677
1678 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1679         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1680         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1681 };
1682
1683 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1684 {
1685         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1686         struct nft_stats __percpu *newstats;
1687         struct nft_stats *stats;
1688         int err;
1689
1690         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1691                                           nft_counter_policy, NULL);
1692         if (err < 0)
1693                 return ERR_PTR(err);
1694
1695         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1696                 return ERR_PTR(-EINVAL);
1697
1698         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1699         if (newstats == NULL)
1700                 return ERR_PTR(-ENOMEM);
1701
1702         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1703          * are not exposed to userspace.
1704          */
1705         preempt_disable();
1706         stats = this_cpu_ptr(newstats);
1707         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1708         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1709         preempt_enable();
1710
1711         return newstats;
1712 }
1713
1714 static void nft_chain_stats_replace(struct nft_trans *trans)
1715 {
1716         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1717
1718         if (!nft_trans_chain_stats(trans))
1719                 return;
1720
1721         nft_trans_chain_stats(trans) =
1722                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1723                                     lockdep_commit_lock_is_held(trans->ctx.net));
1724
1725         if (!nft_trans_chain_stats(trans))
1726                 static_branch_inc(&nft_counters_enabled);
1727 }
1728
1729 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1730 {
1731         struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1732         struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1733
1734         if (g0 != g1)
1735                 kvfree(g1);
1736         kvfree(g0);
1737
1738         /* should be NULL either via abort or via successful commit */
1739         WARN_ON_ONCE(chain->rules_next);
1740         kvfree(chain->rules_next);
1741 }
1742
1743 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1744 {
1745         struct nft_chain *chain = ctx->chain;
1746         struct nft_hook *hook, *next;
1747
1748         if (WARN_ON(chain->use > 0))
1749                 return;
1750
1751         /* no concurrent access possible anymore */
1752         nf_tables_chain_free_chain_rules(chain);
1753
1754         if (nft_is_base_chain(chain)) {
1755                 struct nft_base_chain *basechain = nft_base_chain(chain);
1756
1757                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1758                         list_for_each_entry_safe(hook, next,
1759                                                  &basechain->hook_list, list) {
1760                                 list_del_rcu(&hook->list);
1761                                 kfree_rcu(hook, rcu);
1762                         }
1763                 }
1764                 module_put(basechain->type->owner);
1765                 if (rcu_access_pointer(basechain->stats)) {
1766                         static_branch_dec(&nft_counters_enabled);
1767                         free_percpu(rcu_dereference_raw(basechain->stats));
1768                 }
1769                 kfree(chain->name);
1770                 kfree(chain->udata);
1771                 kfree(basechain);
1772         } else {
1773                 kfree(chain->name);
1774                 kfree(chain->udata);
1775                 kfree(chain);
1776         }
1777 }
1778
1779 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1780                                               const struct nlattr *attr)
1781 {
1782         struct net_device *dev;
1783         char ifname[IFNAMSIZ];
1784         struct nft_hook *hook;
1785         int err;
1786
1787         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1788         if (!hook) {
1789                 err = -ENOMEM;
1790                 goto err_hook_alloc;
1791         }
1792
1793         nla_strscpy(ifname, attr, IFNAMSIZ);
1794         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1795          * indirectly serializing all the other holders of the commit_mutex with
1796          * the rtnl_mutex.
1797          */
1798         dev = __dev_get_by_name(net, ifname);
1799         if (!dev) {
1800                 err = -ENOENT;
1801                 goto err_hook_dev;
1802         }
1803         hook->ops.dev = dev;
1804         hook->inactive = false;
1805
1806         return hook;
1807
1808 err_hook_dev:
1809         kfree(hook);
1810 err_hook_alloc:
1811         return ERR_PTR(err);
1812 }
1813
1814 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1815                                            const struct nft_hook *this)
1816 {
1817         struct nft_hook *hook;
1818
1819         list_for_each_entry(hook, hook_list, list) {
1820                 if (this->ops.dev == hook->ops.dev)
1821                         return hook;
1822         }
1823
1824         return NULL;
1825 }
1826
1827 static int nf_tables_parse_netdev_hooks(struct net *net,
1828                                         const struct nlattr *attr,
1829                                         struct list_head *hook_list)
1830 {
1831         struct nft_hook *hook, *next;
1832         const struct nlattr *tmp;
1833         int rem, n = 0, err;
1834
1835         nla_for_each_nested(tmp, attr, rem) {
1836                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1837                         err = -EINVAL;
1838                         goto err_hook;
1839                 }
1840
1841                 hook = nft_netdev_hook_alloc(net, tmp);
1842                 if (IS_ERR(hook)) {
1843                         err = PTR_ERR(hook);
1844                         goto err_hook;
1845                 }
1846                 if (nft_hook_list_find(hook_list, hook)) {
1847                         kfree(hook);
1848                         err = -EEXIST;
1849                         goto err_hook;
1850                 }
1851                 list_add_tail(&hook->list, hook_list);
1852                 n++;
1853
1854                 if (n == NFT_NETDEVICE_MAX) {
1855                         err = -EFBIG;
1856                         goto err_hook;
1857                 }
1858         }
1859
1860         return 0;
1861
1862 err_hook:
1863         list_for_each_entry_safe(hook, next, hook_list, list) {
1864                 list_del(&hook->list);
1865                 kfree(hook);
1866         }
1867         return err;
1868 }
1869
1870 struct nft_chain_hook {
1871         u32                             num;
1872         s32                             priority;
1873         const struct nft_chain_type     *type;
1874         struct list_head                list;
1875 };
1876
1877 static int nft_chain_parse_netdev(struct net *net,
1878                                   struct nlattr *tb[],
1879                                   struct list_head *hook_list)
1880 {
1881         struct nft_hook *hook;
1882         int err;
1883
1884         if (tb[NFTA_HOOK_DEV]) {
1885                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1886                 if (IS_ERR(hook))
1887                         return PTR_ERR(hook);
1888
1889                 list_add_tail(&hook->list, hook_list);
1890         } else if (tb[NFTA_HOOK_DEVS]) {
1891                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1892                                                    hook_list);
1893                 if (err < 0)
1894                         return err;
1895
1896                 if (list_empty(hook_list))
1897                         return -EINVAL;
1898         } else {
1899                 return -EINVAL;
1900         }
1901
1902         return 0;
1903 }
1904
1905 static int nft_chain_parse_hook(struct net *net,
1906                                 const struct nlattr * const nla[],
1907                                 struct nft_chain_hook *hook, u8 family,
1908                                 bool autoload)
1909 {
1910         struct nftables_pernet *nft_net = nft_pernet(net);
1911         struct nlattr *ha[NFTA_HOOK_MAX + 1];
1912         const struct nft_chain_type *type;
1913         int err;
1914
1915         lockdep_assert_held(&nft_net->commit_mutex);
1916         lockdep_nfnl_nft_mutex_not_held();
1917
1918         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1919                                           nla[NFTA_CHAIN_HOOK],
1920                                           nft_hook_policy, NULL);
1921         if (err < 0)
1922                 return err;
1923
1924         if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1925             ha[NFTA_HOOK_PRIORITY] == NULL)
1926                 return -EINVAL;
1927
1928         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1929         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1930
1931         type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1932         if (!type)
1933                 return -EOPNOTSUPP;
1934
1935         if (nla[NFTA_CHAIN_TYPE]) {
1936                 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1937                                                    family, autoload);
1938                 if (IS_ERR(type))
1939                         return PTR_ERR(type);
1940         }
1941         if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1942                 return -EOPNOTSUPP;
1943
1944         if (type->type == NFT_CHAIN_T_NAT &&
1945             hook->priority <= NF_IP_PRI_CONNTRACK)
1946                 return -EOPNOTSUPP;
1947
1948         if (!try_module_get(type->owner))
1949                 return -ENOENT;
1950
1951         hook->type = type;
1952
1953         INIT_LIST_HEAD(&hook->list);
1954         if (nft_base_chain_netdev(family, hook->num)) {
1955                 err = nft_chain_parse_netdev(net, ha, &hook->list);
1956                 if (err < 0) {
1957                         module_put(type->owner);
1958                         return err;
1959                 }
1960         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
1961                 module_put(type->owner);
1962                 return -EOPNOTSUPP;
1963         }
1964
1965         return 0;
1966 }
1967
1968 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1969 {
1970         struct nft_hook *h, *next;
1971
1972         list_for_each_entry_safe(h, next, &hook->list, list) {
1973                 list_del(&h->list);
1974                 kfree(h);
1975         }
1976         module_put(hook->type->owner);
1977 }
1978
1979 struct nft_rules_old {
1980         struct rcu_head h;
1981         struct nft_rule **start;
1982 };
1983
1984 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1985                                                      unsigned int alloc)
1986 {
1987         if (alloc > INT_MAX)
1988                 return NULL;
1989
1990         alloc += 1;     /* NULL, ends rules */
1991         if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1992                 return NULL;
1993
1994         alloc *= sizeof(struct nft_rule *);
1995         alloc += sizeof(struct nft_rules_old);
1996
1997         return kvmalloc(alloc, GFP_KERNEL);
1998 }
1999
2000 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2001                                     const struct nft_chain_hook *hook,
2002                                     struct nft_chain *chain)
2003 {
2004         ops->pf         = family;
2005         ops->hooknum    = hook->num;
2006         ops->priority   = hook->priority;
2007         ops->priv       = chain;
2008         ops->hook       = hook->type->hooks[ops->hooknum];
2009 }
2010
2011 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2012                               struct nft_chain_hook *hook, u32 flags)
2013 {
2014         struct nft_chain *chain;
2015         struct nft_hook *h;
2016
2017         basechain->type = hook->type;
2018         INIT_LIST_HEAD(&basechain->hook_list);
2019         chain = &basechain->chain;
2020
2021         if (nft_base_chain_netdev(family, hook->num)) {
2022                 list_splice_init(&hook->list, &basechain->hook_list);
2023                 list_for_each_entry(h, &basechain->hook_list, list)
2024                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2025
2026                 basechain->ops.hooknum  = hook->num;
2027                 basechain->ops.priority = hook->priority;
2028         } else {
2029                 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2030         }
2031
2032         chain->flags |= NFT_CHAIN_BASE | flags;
2033         basechain->policy = NF_ACCEPT;
2034         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2035             nft_chain_offload_priority(basechain) < 0)
2036                 return -EOPNOTSUPP;
2037
2038         flow_block_init(&basechain->flow_block);
2039
2040         return 0;
2041 }
2042
2043 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2044 {
2045         int err;
2046
2047         err = rhltable_insert_key(&table->chains_ht, chain->name,
2048                                   &chain->rhlhead, nft_chain_ht_params);
2049         if (err)
2050                 return err;
2051
2052         list_add_tail_rcu(&chain->list, &table->chains);
2053
2054         return 0;
2055 }
2056
2057 static u64 chain_id;
2058
2059 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2060                               u8 policy, u32 flags)
2061 {
2062         const struct nlattr * const *nla = ctx->nla;
2063         struct nft_table *table = ctx->table;
2064         struct nft_base_chain *basechain;
2065         struct nft_stats __percpu *stats;
2066         struct net *net = ctx->net;
2067         char name[NFT_NAME_MAXLEN];
2068         struct nft_trans *trans;
2069         struct nft_chain *chain;
2070         struct nft_rule **rules;
2071         int err;
2072
2073         if (table->use == UINT_MAX)
2074                 return -EOVERFLOW;
2075
2076         if (nla[NFTA_CHAIN_HOOK]) {
2077                 struct nft_chain_hook hook;
2078
2079                 if (flags & NFT_CHAIN_BINDING)
2080                         return -EOPNOTSUPP;
2081
2082                 err = nft_chain_parse_hook(net, nla, &hook, family, true);
2083                 if (err < 0)
2084                         return err;
2085
2086                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
2087                 if (basechain == NULL) {
2088                         nft_chain_release_hook(&hook);
2089                         return -ENOMEM;
2090                 }
2091                 chain = &basechain->chain;
2092
2093                 if (nla[NFTA_CHAIN_COUNTERS]) {
2094                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2095                         if (IS_ERR(stats)) {
2096                                 nft_chain_release_hook(&hook);
2097                                 kfree(basechain);
2098                                 return PTR_ERR(stats);
2099                         }
2100                         rcu_assign_pointer(basechain->stats, stats);
2101                         static_branch_inc(&nft_counters_enabled);
2102                 }
2103
2104                 err = nft_basechain_init(basechain, family, &hook, flags);
2105                 if (err < 0) {
2106                         nft_chain_release_hook(&hook);
2107                         kfree(basechain);
2108                         return err;
2109                 }
2110         } else {
2111                 if (flags & NFT_CHAIN_BASE)
2112                         return -EINVAL;
2113                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2114                         return -EOPNOTSUPP;
2115
2116                 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2117                 if (chain == NULL)
2118                         return -ENOMEM;
2119
2120                 chain->flags = flags;
2121         }
2122         ctx->chain = chain;
2123
2124         INIT_LIST_HEAD(&chain->rules);
2125         chain->handle = nf_tables_alloc_handle(table);
2126         chain->table = table;
2127
2128         if (nla[NFTA_CHAIN_NAME]) {
2129                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2130         } else {
2131                 if (!(flags & NFT_CHAIN_BINDING)) {
2132                         err = -EINVAL;
2133                         goto err_destroy_chain;
2134                 }
2135
2136                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2137                 chain->name = kstrdup(name, GFP_KERNEL);
2138         }
2139
2140         if (!chain->name) {
2141                 err = -ENOMEM;
2142                 goto err_destroy_chain;
2143         }
2144
2145         if (nla[NFTA_CHAIN_USERDATA]) {
2146                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL);
2147                 if (chain->udata == NULL) {
2148                         err = -ENOMEM;
2149                         goto err_destroy_chain;
2150                 }
2151                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2152         }
2153
2154         rules = nf_tables_chain_alloc_rules(chain, 0);
2155         if (!rules) {
2156                 err = -ENOMEM;
2157                 goto err_destroy_chain;
2158         }
2159
2160         *rules = NULL;
2161         rcu_assign_pointer(chain->rules_gen_0, rules);
2162         rcu_assign_pointer(chain->rules_gen_1, rules);
2163
2164         err = nf_tables_register_hook(net, table, chain);
2165         if (err < 0)
2166                 goto err_destroy_chain;
2167
2168         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2169         if (IS_ERR(trans)) {
2170                 err = PTR_ERR(trans);
2171                 goto err_unregister_hook;
2172         }
2173
2174         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2175         if (nft_is_base_chain(chain))
2176                 nft_trans_chain_policy(trans) = policy;
2177
2178         err = nft_chain_add(table, chain);
2179         if (err < 0) {
2180                 nft_trans_destroy(trans);
2181                 goto err_unregister_hook;
2182         }
2183
2184         table->use++;
2185
2186         return 0;
2187 err_unregister_hook:
2188         nf_tables_unregister_hook(net, table, chain);
2189 err_destroy_chain:
2190         nf_tables_chain_destroy(ctx);
2191
2192         return err;
2193 }
2194
2195 static bool nft_hook_list_equal(struct list_head *hook_list1,
2196                                 struct list_head *hook_list2)
2197 {
2198         struct nft_hook *hook;
2199         int n = 0, m = 0;
2200
2201         n = 0;
2202         list_for_each_entry(hook, hook_list2, list) {
2203                 if (!nft_hook_list_find(hook_list1, hook))
2204                         return false;
2205
2206                 n++;
2207         }
2208         list_for_each_entry(hook, hook_list1, list)
2209                 m++;
2210
2211         return n == m;
2212 }
2213
2214 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2215                               u32 flags, const struct nlattr *attr,
2216                               struct netlink_ext_ack *extack)
2217 {
2218         const struct nlattr * const *nla = ctx->nla;
2219         struct nft_table *table = ctx->table;
2220         struct nft_chain *chain = ctx->chain;
2221         struct nft_base_chain *basechain;
2222         struct nft_stats *stats = NULL;
2223         struct nft_chain_hook hook;
2224         struct nf_hook_ops *ops;
2225         struct nft_trans *trans;
2226         int err;
2227
2228         if (chain->flags ^ flags)
2229                 return -EOPNOTSUPP;
2230
2231         if (nla[NFTA_CHAIN_HOOK]) {
2232                 if (!nft_is_base_chain(chain)) {
2233                         NL_SET_BAD_ATTR(extack, attr);
2234                         return -EEXIST;
2235                 }
2236                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2237                                            false);
2238                 if (err < 0)
2239                         return err;
2240
2241                 basechain = nft_base_chain(chain);
2242                 if (basechain->type != hook.type) {
2243                         nft_chain_release_hook(&hook);
2244                         NL_SET_BAD_ATTR(extack, attr);
2245                         return -EEXIST;
2246                 }
2247
2248                 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2249                         if (!nft_hook_list_equal(&basechain->hook_list,
2250                                                  &hook.list)) {
2251                                 nft_chain_release_hook(&hook);
2252                                 NL_SET_BAD_ATTR(extack, attr);
2253                                 return -EEXIST;
2254                         }
2255                 } else {
2256                         ops = &basechain->ops;
2257                         if (ops->hooknum != hook.num ||
2258                             ops->priority != hook.priority) {
2259                                 nft_chain_release_hook(&hook);
2260                                 NL_SET_BAD_ATTR(extack, attr);
2261                                 return -EEXIST;
2262                         }
2263                 }
2264                 nft_chain_release_hook(&hook);
2265         }
2266
2267         if (nla[NFTA_CHAIN_HANDLE] &&
2268             nla[NFTA_CHAIN_NAME]) {
2269                 struct nft_chain *chain2;
2270
2271                 chain2 = nft_chain_lookup(ctx->net, table,
2272                                           nla[NFTA_CHAIN_NAME], genmask);
2273                 if (!IS_ERR(chain2)) {
2274                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2275                         return -EEXIST;
2276                 }
2277         }
2278
2279         if (nla[NFTA_CHAIN_COUNTERS]) {
2280                 if (!nft_is_base_chain(chain))
2281                         return -EOPNOTSUPP;
2282
2283                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2284                 if (IS_ERR(stats))
2285                         return PTR_ERR(stats);
2286         }
2287
2288         err = -ENOMEM;
2289         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2290                                 sizeof(struct nft_trans_chain));
2291         if (trans == NULL)
2292                 goto err;
2293
2294         nft_trans_chain_stats(trans) = stats;
2295         nft_trans_chain_update(trans) = true;
2296
2297         if (nla[NFTA_CHAIN_POLICY])
2298                 nft_trans_chain_policy(trans) = policy;
2299         else
2300                 nft_trans_chain_policy(trans) = -1;
2301
2302         if (nla[NFTA_CHAIN_HANDLE] &&
2303             nla[NFTA_CHAIN_NAME]) {
2304                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2305                 struct nft_trans *tmp;
2306                 char *name;
2307
2308                 err = -ENOMEM;
2309                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2310                 if (!name)
2311                         goto err;
2312
2313                 err = -EEXIST;
2314                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2315                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2316                             tmp->ctx.table == table &&
2317                             nft_trans_chain_update(tmp) &&
2318                             nft_trans_chain_name(tmp) &&
2319                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2320                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2321                                 kfree(name);
2322                                 goto err;
2323                         }
2324                 }
2325
2326                 nft_trans_chain_name(trans) = name;
2327         }
2328         nft_trans_commit_list_add_tail(ctx->net, trans);
2329
2330         return 0;
2331 err:
2332         free_percpu(stats);
2333         kfree(trans);
2334         return err;
2335 }
2336
2337 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2338                                                const struct nlattr *nla)
2339 {
2340         struct nftables_pernet *nft_net = nft_pernet(net);
2341         u32 id = ntohl(nla_get_be32(nla));
2342         struct nft_trans *trans;
2343
2344         list_for_each_entry(trans, &nft_net->commit_list, list) {
2345                 struct nft_chain *chain = trans->ctx.chain;
2346
2347                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2348                     id == nft_trans_chain_id(trans))
2349                         return chain;
2350         }
2351         return ERR_PTR(-ENOENT);
2352 }
2353
2354 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2355                               const struct nlattr * const nla[])
2356 {
2357         struct nftables_pernet *nft_net = nft_pernet(info->net);
2358         const struct nfgenmsg *nfmsg = nlmsg_data(info->nlh);
2359         struct netlink_ext_ack *extack = info->extack;
2360         u8 genmask = nft_genmask_next(info->net);
2361         int family = nfmsg->nfgen_family;
2362         struct nft_chain *chain = NULL;
2363         struct net *net = info->net;
2364         const struct nlattr *attr;
2365         struct nft_table *table;
2366         u8 policy = NF_ACCEPT;
2367         struct nft_ctx ctx;
2368         u64 handle = 0;
2369         u32 flags = 0;
2370
2371         lockdep_assert_held(&nft_net->commit_mutex);
2372
2373         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2374                                  NETLINK_CB(skb).portid);
2375         if (IS_ERR(table)) {
2376                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2377                 return PTR_ERR(table);
2378         }
2379
2380         chain = NULL;
2381         attr = nla[NFTA_CHAIN_NAME];
2382
2383         if (nla[NFTA_CHAIN_HANDLE]) {
2384                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2385                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2386                 if (IS_ERR(chain)) {
2387                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2388                         return PTR_ERR(chain);
2389                 }
2390                 attr = nla[NFTA_CHAIN_HANDLE];
2391         } else if (nla[NFTA_CHAIN_NAME]) {
2392                 chain = nft_chain_lookup(net, table, attr, genmask);
2393                 if (IS_ERR(chain)) {
2394                         if (PTR_ERR(chain) != -ENOENT) {
2395                                 NL_SET_BAD_ATTR(extack, attr);
2396                                 return PTR_ERR(chain);
2397                         }
2398                         chain = NULL;
2399                 }
2400         } else if (!nla[NFTA_CHAIN_ID]) {
2401                 return -EINVAL;
2402         }
2403
2404         if (nla[NFTA_CHAIN_POLICY]) {
2405                 if (chain != NULL &&
2406                     !nft_is_base_chain(chain)) {
2407                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2408                         return -EOPNOTSUPP;
2409                 }
2410
2411                 if (chain == NULL &&
2412                     nla[NFTA_CHAIN_HOOK] == NULL) {
2413                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2414                         return -EOPNOTSUPP;
2415                 }
2416
2417                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2418                 switch (policy) {
2419                 case NF_DROP:
2420                 case NF_ACCEPT:
2421                         break;
2422                 default:
2423                         return -EINVAL;
2424                 }
2425         }
2426
2427         if (nla[NFTA_CHAIN_FLAGS])
2428                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2429         else if (chain)
2430                 flags = chain->flags;
2431
2432         if (flags & ~NFT_CHAIN_FLAGS)
2433                 return -EOPNOTSUPP;
2434
2435         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2436
2437         if (chain != NULL) {
2438                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2439                         NL_SET_BAD_ATTR(extack, attr);
2440                         return -EEXIST;
2441                 }
2442                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2443                         return -EOPNOTSUPP;
2444
2445                 flags |= chain->flags & NFT_CHAIN_BASE;
2446                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2447                                           extack);
2448         }
2449
2450         return nf_tables_addchain(&ctx, family, genmask, policy, flags);
2451 }
2452
2453 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2454                               const struct nlattr * const nla[])
2455 {
2456         const struct nfgenmsg *nfmsg = nlmsg_data(info->nlh);
2457         struct netlink_ext_ack *extack = info->extack;
2458         u8 genmask = nft_genmask_next(info->net);
2459         int family = nfmsg->nfgen_family;
2460         struct net *net = info->net;
2461         const struct nlattr *attr;
2462         struct nft_table *table;
2463         struct nft_chain *chain;
2464         struct nft_rule *rule;
2465         struct nft_ctx ctx;
2466         u64 handle;
2467         u32 use;
2468         int err;
2469
2470         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2471                                  NETLINK_CB(skb).portid);
2472         if (IS_ERR(table)) {
2473                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2474                 return PTR_ERR(table);
2475         }
2476
2477         if (nla[NFTA_CHAIN_HANDLE]) {
2478                 attr = nla[NFTA_CHAIN_HANDLE];
2479                 handle = be64_to_cpu(nla_get_be64(attr));
2480                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2481         } else {
2482                 attr = nla[NFTA_CHAIN_NAME];
2483                 chain = nft_chain_lookup(net, table, attr, genmask);
2484         }
2485         if (IS_ERR(chain)) {
2486                 NL_SET_BAD_ATTR(extack, attr);
2487                 return PTR_ERR(chain);
2488         }
2489
2490         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2491             chain->use > 0)
2492                 return -EBUSY;
2493
2494         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2495
2496         use = chain->use;
2497         list_for_each_entry(rule, &chain->rules, list) {
2498                 if (!nft_is_active_next(net, rule))
2499                         continue;
2500                 use--;
2501
2502                 err = nft_delrule(&ctx, rule);
2503                 if (err < 0)
2504                         return err;
2505         }
2506
2507         /* There are rules and elements that are still holding references to us,
2508          * we cannot do a recursive removal in this case.
2509          */
2510         if (use > 0) {
2511                 NL_SET_BAD_ATTR(extack, attr);
2512                 return -EBUSY;
2513         }
2514
2515         return nft_delchain(&ctx);
2516 }
2517
2518 /*
2519  * Expressions
2520  */
2521
2522 /**
2523  *      nft_register_expr - register nf_tables expr type
2524  *      @type: expr type
2525  *
2526  *      Registers the expr type for use with nf_tables. Returns zero on
2527  *      success or a negative errno code otherwise.
2528  */
2529 int nft_register_expr(struct nft_expr_type *type)
2530 {
2531         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2532         if (type->family == NFPROTO_UNSPEC)
2533                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2534         else
2535                 list_add_rcu(&type->list, &nf_tables_expressions);
2536         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2537         return 0;
2538 }
2539 EXPORT_SYMBOL_GPL(nft_register_expr);
2540
2541 /**
2542  *      nft_unregister_expr - unregister nf_tables expr type
2543  *      @type: expr type
2544  *
2545  *      Unregisters the expr typefor use with nf_tables.
2546  */
2547 void nft_unregister_expr(struct nft_expr_type *type)
2548 {
2549         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2550         list_del_rcu(&type->list);
2551         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2552 }
2553 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2554
2555 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2556                                                        struct nlattr *nla)
2557 {
2558         const struct nft_expr_type *type, *candidate = NULL;
2559
2560         list_for_each_entry(type, &nf_tables_expressions, list) {
2561                 if (!nla_strcmp(nla, type->name)) {
2562                         if (!type->family && !candidate)
2563                                 candidate = type;
2564                         else if (type->family == family)
2565                                 candidate = type;
2566                 }
2567         }
2568         return candidate;
2569 }
2570
2571 #ifdef CONFIG_MODULES
2572 static int nft_expr_type_request_module(struct net *net, u8 family,
2573                                         struct nlattr *nla)
2574 {
2575         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2576                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2577                 return -EAGAIN;
2578
2579         return 0;
2580 }
2581 #endif
2582
2583 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2584                                                      u8 family,
2585                                                      struct nlattr *nla)
2586 {
2587         const struct nft_expr_type *type;
2588
2589         if (nla == NULL)
2590                 return ERR_PTR(-EINVAL);
2591
2592         type = __nft_expr_type_get(family, nla);
2593         if (type != NULL && try_module_get(type->owner))
2594                 return type;
2595
2596         lockdep_nfnl_nft_mutex_not_held();
2597 #ifdef CONFIG_MODULES
2598         if (type == NULL) {
2599                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2600                         return ERR_PTR(-EAGAIN);
2601
2602                 if (nft_request_module(net, "nft-expr-%.*s",
2603                                        nla_len(nla),
2604                                        (char *)nla_data(nla)) == -EAGAIN)
2605                         return ERR_PTR(-EAGAIN);
2606         }
2607 #endif
2608         return ERR_PTR(-ENOENT);
2609 }
2610
2611 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2612         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2613                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2614         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2615 };
2616
2617 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2618                                     const struct nft_expr *expr)
2619 {
2620         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2621                 goto nla_put_failure;
2622
2623         if (expr->ops->dump) {
2624                 struct nlattr *data = nla_nest_start_noflag(skb,
2625                                                             NFTA_EXPR_DATA);
2626                 if (data == NULL)
2627                         goto nla_put_failure;
2628                 if (expr->ops->dump(skb, expr) < 0)
2629                         goto nla_put_failure;
2630                 nla_nest_end(skb, data);
2631         }
2632
2633         return skb->len;
2634
2635 nla_put_failure:
2636         return -1;
2637 };
2638
2639 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2640                   const struct nft_expr *expr)
2641 {
2642         struct nlattr *nest;
2643
2644         nest = nla_nest_start_noflag(skb, attr);
2645         if (!nest)
2646                 goto nla_put_failure;
2647         if (nf_tables_fill_expr_info(skb, expr) < 0)
2648                 goto nla_put_failure;
2649         nla_nest_end(skb, nest);
2650         return 0;
2651
2652 nla_put_failure:
2653         return -1;
2654 }
2655
2656 struct nft_expr_info {
2657         const struct nft_expr_ops       *ops;
2658         const struct nlattr             *attr;
2659         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2660 };
2661
2662 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2663                                 const struct nlattr *nla,
2664                                 struct nft_expr_info *info)
2665 {
2666         const struct nft_expr_type *type;
2667         const struct nft_expr_ops *ops;
2668         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2669         int err;
2670
2671         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2672                                           nft_expr_policy, NULL);
2673         if (err < 0)
2674                 return err;
2675
2676         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2677         if (IS_ERR(type))
2678                 return PTR_ERR(type);
2679
2680         if (tb[NFTA_EXPR_DATA]) {
2681                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2682                                                   tb[NFTA_EXPR_DATA],
2683                                                   type->policy, NULL);
2684                 if (err < 0)
2685                         goto err1;
2686         } else
2687                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2688
2689         if (type->select_ops != NULL) {
2690                 ops = type->select_ops(ctx,
2691                                        (const struct nlattr * const *)info->tb);
2692                 if (IS_ERR(ops)) {
2693                         err = PTR_ERR(ops);
2694 #ifdef CONFIG_MODULES
2695                         if (err == -EAGAIN)
2696                                 if (nft_expr_type_request_module(ctx->net,
2697                                                                  ctx->family,
2698                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2699                                         err = -ENOENT;
2700 #endif
2701                         goto err1;
2702                 }
2703         } else
2704                 ops = type->ops;
2705
2706         info->attr = nla;
2707         info->ops = ops;
2708
2709         return 0;
2710
2711 err1:
2712         module_put(type->owner);
2713         return err;
2714 }
2715
2716 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2717                              const struct nft_expr_info *expr_info,
2718                              struct nft_expr *expr)
2719 {
2720         const struct nft_expr_ops *ops = expr_info->ops;
2721         int err;
2722
2723         expr->ops = ops;
2724         if (ops->init) {
2725                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2726                 if (err < 0)
2727                         goto err1;
2728         }
2729
2730         return 0;
2731 err1:
2732         expr->ops = NULL;
2733         return err;
2734 }
2735
2736 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2737                                    struct nft_expr *expr)
2738 {
2739         const struct nft_expr_type *type = expr->ops->type;
2740
2741         if (expr->ops->destroy)
2742                 expr->ops->destroy(ctx, expr);
2743         module_put(type->owner);
2744 }
2745
2746 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2747                                       const struct nlattr *nla)
2748 {
2749         struct nft_expr_info expr_info;
2750         struct nft_expr *expr;
2751         struct module *owner;
2752         int err;
2753
2754         err = nf_tables_expr_parse(ctx, nla, &expr_info);
2755         if (err < 0)
2756                 goto err1;
2757
2758         err = -ENOMEM;
2759         expr = kzalloc(expr_info.ops->size, GFP_KERNEL);
2760         if (expr == NULL)
2761                 goto err2;
2762
2763         err = nf_tables_newexpr(ctx, &expr_info, expr);
2764         if (err < 0)
2765                 goto err3;
2766
2767         return expr;
2768 err3:
2769         kfree(expr);
2770 err2:
2771         owner = expr_info.ops->type->owner;
2772         if (expr_info.ops->type->release_ops)
2773                 expr_info.ops->type->release_ops(expr_info.ops);
2774
2775         module_put(owner);
2776 err1:
2777         return ERR_PTR(err);
2778 }
2779
2780 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2781 {
2782         int err;
2783
2784         if (src->ops->clone) {
2785                 dst->ops = src->ops;
2786                 err = src->ops->clone(dst, src);
2787                 if (err < 0)
2788                         return err;
2789         } else {
2790                 memcpy(dst, src, src->ops->size);
2791         }
2792
2793         __module_get(src->ops->type->owner);
2794
2795         return 0;
2796 }
2797
2798 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2799 {
2800         nf_tables_expr_destroy(ctx, expr);
2801         kfree(expr);
2802 }
2803
2804 /*
2805  * Rules
2806  */
2807
2808 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2809                                           u64 handle)
2810 {
2811         struct nft_rule *rule;
2812
2813         // FIXME: this sucks
2814         list_for_each_entry_rcu(rule, &chain->rules, list) {
2815                 if (handle == rule->handle)
2816                         return rule;
2817         }
2818
2819         return ERR_PTR(-ENOENT);
2820 }
2821
2822 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2823                                         const struct nlattr *nla)
2824 {
2825         if (nla == NULL)
2826                 return ERR_PTR(-EINVAL);
2827
2828         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2829 }
2830
2831 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2832         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
2833                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
2834         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
2835                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
2836         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
2837         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2838         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
2839         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
2840         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
2841                                     .len = NFT_USERDATA_MAXLEN },
2842         [NFTA_RULE_ID]          = { .type = NLA_U32 },
2843         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2844         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
2845 };
2846
2847 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2848                                     u32 portid, u32 seq, int event,
2849                                     u32 flags, int family,
2850                                     const struct nft_table *table,
2851                                     const struct nft_chain *chain,
2852                                     const struct nft_rule *rule,
2853                                     const struct nft_rule *prule)
2854 {
2855         struct nlmsghdr *nlh;
2856         const struct nft_expr *expr, *next;
2857         struct nlattr *list;
2858         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2859
2860         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
2861                            nft_base_seq(net));
2862         if (!nlh)
2863                 goto nla_put_failure;
2864
2865         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2866                 goto nla_put_failure;
2867         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2868                 goto nla_put_failure;
2869         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2870                          NFTA_RULE_PAD))
2871                 goto nla_put_failure;
2872
2873         if (event != NFT_MSG_DELRULE && prule) {
2874                 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2875                                  cpu_to_be64(prule->handle),
2876                                  NFTA_RULE_PAD))
2877                         goto nla_put_failure;
2878         }
2879
2880         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2881                 nft_flow_rule_stats(chain, rule);
2882
2883         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2884         if (list == NULL)
2885                 goto nla_put_failure;
2886         nft_rule_for_each_expr(expr, next, rule) {
2887                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2888                         goto nla_put_failure;
2889         }
2890         nla_nest_end(skb, list);
2891
2892         if (rule->udata) {
2893                 struct nft_userdata *udata = nft_userdata(rule);
2894                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2895                             udata->data) < 0)
2896                         goto nla_put_failure;
2897         }
2898
2899         nlmsg_end(skb, nlh);
2900         return 0;
2901
2902 nla_put_failure:
2903         nlmsg_trim(skb, nlh);
2904         return -1;
2905 }
2906
2907 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2908                                   const struct nft_rule *rule, int event)
2909 {
2910         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2911         struct sk_buff *skb;
2912         int err;
2913
2914         if (!ctx->report &&
2915             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2916                 return;
2917
2918         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2919         if (skb == NULL)
2920                 goto err;
2921
2922         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2923                                        event, 0, ctx->family, ctx->table,
2924                                        ctx->chain, rule, NULL);
2925         if (err < 0) {
2926                 kfree_skb(skb);
2927                 goto err;
2928         }
2929
2930         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
2931         return;
2932 err:
2933         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2934 }
2935
2936 struct nft_rule_dump_ctx {
2937         char *table;
2938         char *chain;
2939 };
2940
2941 static int __nf_tables_dump_rules(struct sk_buff *skb,
2942                                   unsigned int *idx,
2943                                   struct netlink_callback *cb,
2944                                   const struct nft_table *table,
2945                                   const struct nft_chain *chain)
2946 {
2947         struct net *net = sock_net(skb->sk);
2948         const struct nft_rule *rule, *prule;
2949         unsigned int s_idx = cb->args[0];
2950
2951         prule = NULL;
2952         list_for_each_entry_rcu(rule, &chain->rules, list) {
2953                 if (!nft_is_active(net, rule))
2954                         goto cont_skip;
2955                 if (*idx < s_idx)
2956                         goto cont;
2957                 if (*idx > s_idx) {
2958                         memset(&cb->args[1], 0,
2959                                         sizeof(cb->args) - sizeof(cb->args[0]));
2960                 }
2961                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2962                                         cb->nlh->nlmsg_seq,
2963                                         NFT_MSG_NEWRULE,
2964                                         NLM_F_MULTI | NLM_F_APPEND,
2965                                         table->family,
2966                                         table, chain, rule, prule) < 0)
2967                         return 1;
2968
2969                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2970 cont:
2971                 prule = rule;
2972 cont_skip:
2973                 (*idx)++;
2974         }
2975         return 0;
2976 }
2977
2978 static int nf_tables_dump_rules(struct sk_buff *skb,
2979                                 struct netlink_callback *cb)
2980 {
2981         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2982         const struct nft_rule_dump_ctx *ctx = cb->data;
2983         struct nft_table *table;
2984         const struct nft_chain *chain;
2985         unsigned int idx = 0;
2986         struct net *net = sock_net(skb->sk);
2987         int family = nfmsg->nfgen_family;
2988         struct nftables_pernet *nft_net;
2989
2990         rcu_read_lock();
2991         nft_net = nft_pernet(net);
2992         cb->seq = nft_net->base_seq;
2993
2994         list_for_each_entry_rcu(table, &nft_net->tables, list) {
2995                 if (family != NFPROTO_UNSPEC && family != table->family)
2996                         continue;
2997
2998                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2999                         continue;
3000
3001                 if (ctx && ctx->table && ctx->chain) {
3002                         struct rhlist_head *list, *tmp;
3003
3004                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3005                                                nft_chain_ht_params);
3006                         if (!list)
3007                                 goto done;
3008
3009                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3010                                 if (!nft_is_active(net, chain))
3011                                         continue;
3012                                 __nf_tables_dump_rules(skb, &idx,
3013                                                        cb, table, chain);
3014                                 break;
3015                         }
3016                         goto done;
3017                 }
3018
3019                 list_for_each_entry_rcu(chain, &table->chains, list) {
3020                         if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
3021                                 goto done;
3022                 }
3023
3024                 if (ctx && ctx->table)
3025                         break;
3026         }
3027 done:
3028         rcu_read_unlock();
3029
3030         cb->args[0] = idx;
3031         return skb->len;
3032 }
3033
3034 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3035 {
3036         const struct nlattr * const *nla = cb->data;
3037         struct nft_rule_dump_ctx *ctx = NULL;
3038
3039         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3040                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3041                 if (!ctx)
3042                         return -ENOMEM;
3043
3044                 if (nla[NFTA_RULE_TABLE]) {
3045                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3046                                                         GFP_ATOMIC);
3047                         if (!ctx->table) {
3048                                 kfree(ctx);
3049                                 return -ENOMEM;
3050                         }
3051                 }
3052                 if (nla[NFTA_RULE_CHAIN]) {
3053                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3054                                                 GFP_ATOMIC);
3055                         if (!ctx->chain) {
3056                                 kfree(ctx->table);
3057                                 kfree(ctx);
3058                                 return -ENOMEM;
3059                         }
3060                 }
3061         }
3062
3063         cb->data = ctx;
3064         return 0;
3065 }
3066
3067 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3068 {
3069         struct nft_rule_dump_ctx *ctx = cb->data;
3070
3071         if (ctx) {
3072                 kfree(ctx->table);
3073                 kfree(ctx->chain);
3074                 kfree(ctx);
3075         }
3076         return 0;
3077 }
3078
3079 /* called with rcu_read_lock held */
3080 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3081                              const struct nlattr * const nla[])
3082 {
3083         const struct nfgenmsg *nfmsg = nlmsg_data(info->nlh);
3084         struct netlink_ext_ack *extack = info->extack;
3085         u8 genmask = nft_genmask_cur(info->net);
3086         int family = nfmsg->nfgen_family;
3087         const struct nft_chain *chain;
3088         const struct nft_rule *rule;
3089         struct net *net = info->net;
3090         struct nft_table *table;
3091         struct sk_buff *skb2;
3092         int err;
3093
3094         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3095                 struct netlink_dump_control c = {
3096                         .start= nf_tables_dump_rules_start,
3097                         .dump = nf_tables_dump_rules,
3098                         .done = nf_tables_dump_rules_done,
3099                         .module = THIS_MODULE,
3100                         .data = (void *)nla,
3101                 };
3102
3103                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3104         }
3105
3106         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3107         if (IS_ERR(table)) {
3108                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3109                 return PTR_ERR(table);
3110         }
3111
3112         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3113         if (IS_ERR(chain)) {
3114                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3115                 return PTR_ERR(chain);
3116         }
3117
3118         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3119         if (IS_ERR(rule)) {
3120                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3121                 return PTR_ERR(rule);
3122         }
3123
3124         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3125         if (!skb2)
3126                 return -ENOMEM;
3127
3128         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3129                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3130                                        family, table, chain, rule, NULL);
3131         if (err < 0)
3132                 goto err_fill_rule_info;
3133
3134         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3135
3136 err_fill_rule_info:
3137         kfree_skb(skb2);
3138         return err;
3139 }
3140
3141 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3142                                    struct nft_rule *rule)
3143 {
3144         struct nft_expr *expr, *next;
3145
3146         /*
3147          * Careful: some expressions might not be initialized in case this
3148          * is called on error from nf_tables_newrule().
3149          */
3150         expr = nft_expr_first(rule);
3151         while (nft_expr_more(rule, expr)) {
3152                 next = nft_expr_next(expr);
3153                 nf_tables_expr_destroy(ctx, expr);
3154                 expr = next;
3155         }
3156         kfree(rule);
3157 }
3158
3159 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3160 {
3161         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3162         nf_tables_rule_destroy(ctx, rule);
3163 }
3164
3165 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3166 {
3167         struct nft_expr *expr, *last;
3168         const struct nft_data *data;
3169         struct nft_rule *rule;
3170         int err;
3171
3172         if (ctx->level == NFT_JUMP_STACK_SIZE)
3173                 return -EMLINK;
3174
3175         list_for_each_entry(rule, &chain->rules, list) {
3176                 if (!nft_is_active_next(ctx->net, rule))
3177                         continue;
3178
3179                 nft_rule_for_each_expr(expr, last, rule) {
3180                         if (!expr->ops->validate)
3181                                 continue;
3182
3183                         err = expr->ops->validate(ctx, expr, &data);
3184                         if (err < 0)
3185                                 return err;
3186                 }
3187         }
3188
3189         return 0;
3190 }
3191 EXPORT_SYMBOL_GPL(nft_chain_validate);
3192
3193 static int nft_table_validate(struct net *net, const struct nft_table *table)
3194 {
3195         struct nft_chain *chain;
3196         struct nft_ctx ctx = {
3197                 .net    = net,
3198                 .family = table->family,
3199         };
3200         int err;
3201
3202         list_for_each_entry(chain, &table->chains, list) {
3203                 if (!nft_is_base_chain(chain))
3204                         continue;
3205
3206                 ctx.chain = chain;
3207                 err = nft_chain_validate(&ctx, chain);
3208                 if (err < 0)
3209                         return err;
3210         }
3211
3212         return 0;
3213 }
3214
3215 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3216                                              const struct nlattr *nla);
3217
3218 #define NFT_RULE_MAXEXPRS       128
3219
3220 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3221                              const struct nlattr * const nla[])
3222 {
3223         struct nftables_pernet *nft_net = nft_pernet(info->net);
3224         const struct nfgenmsg *nfmsg = nlmsg_data(info->nlh);
3225         struct netlink_ext_ack *extack = info->extack;
3226         unsigned int size, i, n, ulen = 0, usize = 0;
3227         u8 genmask = nft_genmask_next(info->net);
3228         struct nft_rule *rule, *old_rule = NULL;
3229         struct nft_expr_info *expr_info = NULL;
3230         int family = nfmsg->nfgen_family;
3231         struct net *net = info->net;
3232         struct nft_flow_rule *flow;
3233         struct nft_userdata *udata;
3234         struct nft_table *table;
3235         struct nft_chain *chain;
3236         struct nft_trans *trans;
3237         u64 handle, pos_handle;
3238         struct nft_expr *expr;
3239         struct nft_ctx ctx;
3240         struct nlattr *tmp;
3241         int err, rem;
3242
3243         lockdep_assert_held(&nft_net->commit_mutex);
3244
3245         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3246                                  NETLINK_CB(skb).portid);
3247         if (IS_ERR(table)) {
3248                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3249                 return PTR_ERR(table);
3250         }
3251
3252         if (nla[NFTA_RULE_CHAIN]) {
3253                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3254                                          genmask);
3255                 if (IS_ERR(chain)) {
3256                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3257                         return PTR_ERR(chain);
3258                 }
3259                 if (nft_chain_is_bound(chain))
3260                         return -EOPNOTSUPP;
3261
3262         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3263                 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3264                 if (IS_ERR(chain)) {
3265                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3266                         return PTR_ERR(chain);
3267                 }
3268         } else {
3269                 return -EINVAL;
3270         }
3271
3272         if (nla[NFTA_RULE_HANDLE]) {
3273                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3274                 rule = __nft_rule_lookup(chain, handle);
3275                 if (IS_ERR(rule)) {
3276                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3277                         return PTR_ERR(rule);
3278                 }
3279
3280                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3281                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3282                         return -EEXIST;
3283                 }
3284                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3285                         old_rule = rule;
3286                 else
3287                         return -EOPNOTSUPP;
3288         } else {
3289                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3290                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3291                         return -EINVAL;
3292                 handle = nf_tables_alloc_handle(table);
3293
3294                 if (chain->use == UINT_MAX)
3295                         return -EOVERFLOW;
3296
3297                 if (nla[NFTA_RULE_POSITION]) {
3298                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3299                         old_rule = __nft_rule_lookup(chain, pos_handle);
3300                         if (IS_ERR(old_rule)) {
3301                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3302                                 return PTR_ERR(old_rule);
3303                         }
3304                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3305                         old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3306                         if (IS_ERR(old_rule)) {
3307                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3308                                 return PTR_ERR(old_rule);
3309                         }
3310                 }
3311         }
3312
3313         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3314
3315         n = 0;
3316         size = 0;
3317         if (nla[NFTA_RULE_EXPRESSIONS]) {
3318                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3319                                            sizeof(struct nft_expr_info),
3320                                            GFP_KERNEL);
3321                 if (!expr_info)
3322                         return -ENOMEM;
3323
3324                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3325                         err = -EINVAL;
3326                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3327                                 goto err1;
3328                         if (n == NFT_RULE_MAXEXPRS)
3329                                 goto err1;
3330                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3331                         if (err < 0)
3332                                 goto err1;
3333                         size += expr_info[n].ops->size;
3334                         n++;
3335                 }
3336         }
3337         /* Check for overflow of dlen field */
3338         err = -EFBIG;
3339         if (size >= 1 << 12)
3340                 goto err1;
3341
3342         if (nla[NFTA_RULE_USERDATA]) {
3343                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3344                 if (ulen > 0)
3345                         usize = sizeof(struct nft_userdata) + ulen;
3346         }
3347
3348         err = -ENOMEM;
3349         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3350         if (rule == NULL)
3351                 goto err1;
3352
3353         nft_activate_next(net, rule);
3354
3355         rule->handle = handle;
3356         rule->dlen   = size;
3357         rule->udata  = ulen ? 1 : 0;
3358
3359         if (ulen) {
3360                 udata = nft_userdata(rule);
3361                 udata->len = ulen - 1;
3362                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3363         }
3364
3365         expr = nft_expr_first(rule);
3366         for (i = 0; i < n; i++) {
3367                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3368                 if (err < 0) {
3369                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3370                         goto err2;
3371                 }
3372
3373                 if (expr_info[i].ops->validate)
3374                         nft_validate_state_update(net, NFT_VALIDATE_NEED);
3375
3376                 expr_info[i].ops = NULL;
3377                 expr = nft_expr_next(expr);
3378         }
3379
3380         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3381                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3382                 if (trans == NULL) {
3383                         err = -ENOMEM;
3384                         goto err2;
3385                 }
3386                 err = nft_delrule(&ctx, old_rule);
3387                 if (err < 0) {
3388                         nft_trans_destroy(trans);
3389                         goto err2;
3390                 }
3391
3392                 list_add_tail_rcu(&rule->list, &old_rule->list);
3393         } else {
3394                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3395                 if (!trans) {
3396                         err = -ENOMEM;
3397                         goto err2;
3398                 }
3399
3400                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3401                         if (old_rule)
3402                                 list_add_rcu(&rule->list, &old_rule->list);
3403                         else
3404                                 list_add_tail_rcu(&rule->list, &chain->rules);
3405                  } else {
3406                         if (old_rule)
3407                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3408                         else
3409                                 list_add_rcu(&rule->list, &chain->rules);
3410                 }
3411         }
3412         kvfree(expr_info);
3413         chain->use++;
3414
3415         if (nft_net->validate_state == NFT_VALIDATE_DO)
3416                 return nft_table_validate(net, table);
3417
3418         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3419                 flow = nft_flow_rule_create(net, rule);
3420                 if (IS_ERR(flow))
3421                         return PTR_ERR(flow);
3422
3423                 nft_trans_flow_rule(trans) = flow;
3424         }
3425
3426         return 0;
3427 err2:
3428         nf_tables_rule_release(&ctx, rule);
3429 err1:
3430         for (i = 0; i < n; i++) {
3431                 if (expr_info[i].ops) {
3432                         module_put(expr_info[i].ops->type->owner);
3433                         if (expr_info[i].ops->type->release_ops)
3434                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3435                 }
3436         }
3437         kvfree(expr_info);
3438
3439         return err;
3440 }
3441
3442 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3443                                              const struct nlattr *nla)
3444 {
3445         struct nftables_pernet *nft_net = nft_pernet(net);
3446         u32 id = ntohl(nla_get_be32(nla));
3447         struct nft_trans *trans;
3448
3449         list_for_each_entry(trans, &nft_net->commit_list, list) {
3450                 struct nft_rule *rule = nft_trans_rule(trans);
3451
3452                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3453                     id == nft_trans_rule_id(trans))
3454                         return rule;
3455         }
3456         return ERR_PTR(-ENOENT);
3457 }
3458
3459 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3460                              const struct nlattr * const nla[])
3461 {
3462         const struct nfgenmsg *nfmsg = nlmsg_data(info->nlh);
3463         struct netlink_ext_ack *extack = info->extack;
3464         int family = nfmsg->nfgen_family, err = 0;
3465         u8 genmask = nft_genmask_next(info->net);
3466         struct nft_chain *chain = NULL;
3467         struct net *net = info->net;
3468         struct nft_table *table;
3469         struct nft_rule *rule;
3470         struct nft_ctx ctx;
3471
3472         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3473                                  NETLINK_CB(skb).portid);
3474         if (IS_ERR(table)) {
3475                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3476                 return PTR_ERR(table);
3477         }
3478
3479         if (nla[NFTA_RULE_CHAIN]) {
3480                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3481                                          genmask);
3482                 if (IS_ERR(chain)) {
3483                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3484                         return PTR_ERR(chain);
3485                 }
3486                 if (nft_chain_is_bound(chain))
3487                         return -EOPNOTSUPP;
3488         }
3489
3490         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3491
3492         if (chain) {
3493                 if (nla[NFTA_RULE_HANDLE]) {
3494                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3495                         if (IS_ERR(rule)) {
3496                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3497                                 return PTR_ERR(rule);
3498                         }
3499
3500                         err = nft_delrule(&ctx, rule);
3501                 } else if (nla[NFTA_RULE_ID]) {
3502                         rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3503                         if (IS_ERR(rule)) {
3504                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3505                                 return PTR_ERR(rule);
3506                         }
3507
3508                         err = nft_delrule(&ctx, rule);
3509                 } else {
3510                         err = nft_delrule_by_chain(&ctx);
3511                 }
3512         } else {
3513                 list_for_each_entry(chain, &table->chains, list) {
3514                         if (!nft_is_active_next(net, chain))
3515                                 continue;
3516
3517                         ctx.chain = chain;
3518                         err = nft_delrule_by_chain(&ctx);
3519                         if (err < 0)
3520                                 break;
3521                 }
3522         }
3523
3524         return err;
3525 }
3526
3527 /*
3528  * Sets
3529  */
3530 static const struct nft_set_type *nft_set_types[] = {
3531         &nft_set_hash_fast_type,
3532         &nft_set_hash_type,
3533         &nft_set_rhash_type,
3534         &nft_set_bitmap_type,
3535         &nft_set_rbtree_type,
3536 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3537         &nft_set_pipapo_avx2_type,
3538 #endif
3539         &nft_set_pipapo_type,
3540 };
3541
3542 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3543                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3544                                  NFT_SET_EVAL)
3545
3546 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3547 {
3548         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3549 }
3550
3551 /*
3552  * Select a set implementation based on the data characteristics and the
3553  * given policy. The total memory use might not be known if no size is
3554  * given, in that case the amount of memory per element is used.
3555  */
3556 static const struct nft_set_ops *
3557 nft_select_set_ops(const struct nft_ctx *ctx,
3558                    const struct nlattr * const nla[],
3559                    const struct nft_set_desc *desc,
3560                    enum nft_set_policies policy)
3561 {
3562         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3563         const struct nft_set_ops *ops, *bops;
3564         struct nft_set_estimate est, best;
3565         const struct nft_set_type *type;
3566         u32 flags = 0;
3567         int i;
3568
3569         lockdep_assert_held(&nft_net->commit_mutex);
3570         lockdep_nfnl_nft_mutex_not_held();
3571
3572         if (nla[NFTA_SET_FLAGS] != NULL)
3573                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3574
3575         bops        = NULL;
3576         best.size   = ~0;
3577         best.lookup = ~0;
3578         best.space  = ~0;
3579
3580         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3581                 type = nft_set_types[i];
3582                 ops = &type->ops;
3583
3584                 if (!nft_set_ops_candidate(type, flags))
3585                         continue;
3586                 if (!ops->estimate(desc, flags, &est))
3587                         continue;
3588
3589                 switch (policy) {
3590                 case NFT_SET_POL_PERFORMANCE:
3591                         if (est.lookup < best.lookup)
3592                                 break;
3593                         if (est.lookup == best.lookup &&
3594                             est.space < best.space)
3595                                 break;
3596                         continue;
3597                 case NFT_SET_POL_MEMORY:
3598                         if (!desc->size) {
3599                                 if (est.space < best.space)
3600                                         break;
3601                                 if (est.space == best.space &&
3602                                     est.lookup < best.lookup)
3603                                         break;
3604                         } else if (est.size < best.size || !bops) {
3605                                 break;
3606                         }
3607                         continue;
3608                 default:
3609                         break;
3610                 }
3611
3612                 bops = ops;
3613                 best = est;
3614         }
3615
3616         if (bops != NULL)
3617                 return bops;
3618
3619         return ERR_PTR(-EOPNOTSUPP);
3620 }
3621
3622 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3623         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3624                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3625         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3626                                             .len = NFT_SET_MAXNAMELEN - 1 },
3627         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3628         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3629         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3630         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3631         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3632         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3633         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3634         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3635         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3636         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3637         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3638                                             .len  = NFT_USERDATA_MAXLEN },
3639         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3640         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3641         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3642         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
3643 };
3644
3645 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3646         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3647         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3648 };
3649
3650 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
3651                                      const struct sk_buff *skb,
3652                                      const struct nlmsghdr *nlh,
3653                                      const struct nlattr * const nla[],
3654                                      struct netlink_ext_ack *extack,
3655                                      u8 genmask, u32 nlpid)
3656 {
3657         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3658         int family = nfmsg->nfgen_family;
3659         struct nft_table *table = NULL;
3660
3661         if (nla[NFTA_SET_TABLE] != NULL) {
3662                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3663                                          genmask, nlpid);
3664                 if (IS_ERR(table)) {
3665                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3666                         return PTR_ERR(table);
3667                 }
3668         }
3669
3670         nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3671         return 0;
3672 }
3673
3674 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3675                                       const struct nlattr *nla, u8 genmask)
3676 {
3677         struct nft_set *set;
3678
3679         if (nla == NULL)
3680                 return ERR_PTR(-EINVAL);
3681
3682         list_for_each_entry_rcu(set, &table->sets, list) {
3683                 if (!nla_strcmp(nla, set->name) &&
3684                     nft_active_genmask(set, genmask))
3685                         return set;
3686         }
3687         return ERR_PTR(-ENOENT);
3688 }
3689
3690 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3691                                                const struct nlattr *nla,
3692                                                u8 genmask)
3693 {
3694         struct nft_set *set;
3695
3696         list_for_each_entry(set, &table->sets, list) {
3697                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3698                     nft_active_genmask(set, genmask))
3699                         return set;
3700         }
3701         return ERR_PTR(-ENOENT);
3702 }
3703
3704 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3705                                            const struct nlattr *nla, u8 genmask)
3706 {
3707         struct nftables_pernet *nft_net = nft_pernet(net);
3708         u32 id = ntohl(nla_get_be32(nla));
3709         struct nft_trans *trans;
3710
3711         list_for_each_entry(trans, &nft_net->commit_list, list) {
3712                 if (trans->msg_type == NFT_MSG_NEWSET) {
3713                         struct nft_set *set = nft_trans_set(trans);
3714
3715                         if (id == nft_trans_set_id(trans) &&
3716                             nft_active_genmask(set, genmask))
3717                                 return set;
3718                 }
3719         }
3720         return ERR_PTR(-ENOENT);
3721 }
3722
3723 struct nft_set *nft_set_lookup_global(const struct net *net,
3724                                       const struct nft_table *table,
3725                                       const struct nlattr *nla_set_name,
3726                                       const struct nlattr *nla_set_id,
3727                                       u8 genmask)
3728 {
3729         struct nft_set *set;
3730
3731         set = nft_set_lookup(table, nla_set_name, genmask);
3732         if (IS_ERR(set)) {
3733                 if (!nla_set_id)
3734                         return set;
3735
3736                 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3737         }
3738         return set;
3739 }
3740 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3741
3742 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3743                                     const char *name)
3744 {
3745         const struct nft_set *i;
3746         const char *p;
3747         unsigned long *inuse;
3748         unsigned int n = 0, min = 0;
3749
3750         p = strchr(name, '%');
3751         if (p != NULL) {
3752                 if (p[1] != 'd' || strchr(p + 2, '%'))
3753                         return -EINVAL;
3754
3755                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3756                 if (inuse == NULL)
3757                         return -ENOMEM;
3758 cont:
3759                 list_for_each_entry(i, &ctx->table->sets, list) {
3760                         int tmp;
3761
3762                         if (!nft_is_active_next(ctx->net, set))
3763                                 continue;
3764                         if (!sscanf(i->name, name, &tmp))
3765                                 continue;
3766                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3767                                 continue;
3768
3769                         set_bit(tmp - min, inuse);
3770                 }
3771
3772                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3773                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3774                         min += BITS_PER_BYTE * PAGE_SIZE;
3775                         memset(inuse, 0, PAGE_SIZE);
3776                         goto cont;
3777                 }
3778                 free_page((unsigned long)inuse);
3779         }
3780
3781         set->name = kasprintf(GFP_KERNEL, name, min + n);
3782         if (!set->name)
3783                 return -ENOMEM;
3784
3785         list_for_each_entry(i, &ctx->table->sets, list) {
3786                 if (!nft_is_active_next(ctx->net, i))
3787                         continue;
3788                 if (!strcmp(set->name, i->name)) {
3789                         kfree(set->name);
3790                         set->name = NULL;
3791                         return -ENFILE;
3792                 }
3793         }
3794         return 0;
3795 }
3796
3797 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3798 {
3799         u64 ms = be64_to_cpu(nla_get_be64(nla));
3800         u64 max = (u64)(~((u64)0));
3801
3802         max = div_u64(max, NSEC_PER_MSEC);
3803         if (ms >= max)
3804                 return -ERANGE;
3805
3806         ms *= NSEC_PER_MSEC;
3807         *result = nsecs_to_jiffies64(ms);
3808         return 0;
3809 }
3810
3811 __be64 nf_jiffies64_to_msecs(u64 input)
3812 {
3813         return cpu_to_be64(jiffies64_to_msecs(input));
3814 }
3815
3816 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3817                                      const struct nft_set *set)
3818 {
3819         struct nlattr *concat, *field;
3820         int i;
3821
3822         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3823         if (!concat)
3824                 return -ENOMEM;
3825
3826         for (i = 0; i < set->field_count; i++) {
3827                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3828                 if (!field)
3829                         return -ENOMEM;
3830
3831                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3832                                  htonl(set->field_len[i])))
3833                         return -ENOMEM;
3834
3835                 nla_nest_end(skb, field);
3836         }
3837
3838         nla_nest_end(skb, concat);
3839
3840         return 0;
3841 }
3842
3843 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3844                               const struct nft_set *set, u16 event, u16 flags)
3845 {
3846         struct nlmsghdr *nlh;
3847         u32 portid = ctx->portid;
3848         struct nlattr *nest;
3849         u32 seq = ctx->seq;
3850         int i;
3851
3852         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3853         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
3854                            NFNETLINK_V0, nft_base_seq(ctx->net));
3855         if (!nlh)
3856                 goto nla_put_failure;
3857
3858         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3859                 goto nla_put_failure;
3860         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3861                 goto nla_put_failure;
3862         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3863                          NFTA_SET_PAD))
3864                 goto nla_put_failure;
3865         if (set->flags != 0)
3866                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3867                         goto nla_put_failure;
3868
3869         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3870                 goto nla_put_failure;
3871         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3872                 goto nla_put_failure;
3873         if (set->flags & NFT_SET_MAP) {
3874                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3875                         goto nla_put_failure;
3876                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3877                         goto nla_put_failure;
3878         }
3879         if (set->flags & NFT_SET_OBJECT &&
3880             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3881                 goto nla_put_failure;
3882
3883         if (set->timeout &&
3884             nla_put_be64(skb, NFTA_SET_TIMEOUT,
3885                          nf_jiffies64_to_msecs(set->timeout),
3886                          NFTA_SET_PAD))
3887                 goto nla_put_failure;
3888         if (set->gc_int &&
3889             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3890                 goto nla_put_failure;
3891
3892         if (set->policy != NFT_SET_POL_PERFORMANCE) {
3893                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3894                         goto nla_put_failure;
3895         }
3896
3897         if (set->udata &&
3898             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3899                 goto nla_put_failure;
3900
3901         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3902         if (!nest)
3903                 goto nla_put_failure;
3904         if (set->size &&
3905             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3906                 goto nla_put_failure;
3907
3908         if (set->field_count > 1 &&
3909             nf_tables_fill_set_concat(skb, set))
3910                 goto nla_put_failure;
3911
3912         nla_nest_end(skb, nest);
3913
3914         if (set->num_exprs == 1) {
3915                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3916                 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
3917                         goto nla_put_failure;
3918
3919                 nla_nest_end(skb, nest);
3920         } else if (set->num_exprs > 1) {
3921                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
3922                 if (nest == NULL)
3923                         goto nla_put_failure;
3924
3925                 for (i = 0; i < set->num_exprs; i++) {
3926                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
3927                                           set->exprs[i]) < 0)
3928                                 goto nla_put_failure;
3929                 }
3930                 nla_nest_end(skb, nest);
3931         }
3932
3933         nlmsg_end(skb, nlh);
3934         return 0;
3935
3936 nla_put_failure:
3937         nlmsg_trim(skb, nlh);
3938         return -1;
3939 }
3940
3941 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3942                                  const struct nft_set *set, int event,
3943                                  gfp_t gfp_flags)
3944 {
3945         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3946         struct sk_buff *skb;
3947         u32 portid = ctx->portid;
3948         int err;
3949
3950         if (!ctx->report &&
3951             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3952                 return;
3953
3954         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3955         if (skb == NULL)
3956                 goto err;
3957
3958         err = nf_tables_fill_set(skb, ctx, set, event, 0);
3959         if (err < 0) {
3960                 kfree_skb(skb);
3961                 goto err;
3962         }
3963
3964         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3965         return;
3966 err:
3967         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3968 }
3969
3970 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3971 {
3972         const struct nft_set *set;
3973         unsigned int idx, s_idx = cb->args[0];
3974         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3975         struct net *net = sock_net(skb->sk);
3976         struct nft_ctx *ctx = cb->data, ctx_set;
3977         struct nftables_pernet *nft_net;
3978
3979         if (cb->args[1])
3980                 return skb->len;
3981
3982         rcu_read_lock();
3983         nft_net = nft_pernet(net);
3984         cb->seq = nft_net->base_seq;
3985
3986         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3987                 if (ctx->family != NFPROTO_UNSPEC &&
3988                     ctx->family != table->family)
3989                         continue;
3990
3991                 if (ctx->table && ctx->table != table)
3992                         continue;
3993
3994                 if (cur_table) {
3995                         if (cur_table != table)
3996                                 continue;
3997
3998                         cur_table = NULL;
3999                 }
4000                 idx = 0;
4001                 list_for_each_entry_rcu(set, &table->sets, list) {
4002                         if (idx < s_idx)
4003                                 goto cont;
4004                         if (!nft_is_active(net, set))
4005                                 goto cont;
4006
4007                         ctx_set = *ctx;
4008                         ctx_set.table = table;
4009                         ctx_set.family = table->family;
4010
4011                         if (nf_tables_fill_set(skb, &ctx_set, set,
4012                                                NFT_MSG_NEWSET,
4013                                                NLM_F_MULTI) < 0) {
4014                                 cb->args[0] = idx;
4015                                 cb->args[2] = (unsigned long) table;
4016                                 goto done;
4017                         }
4018                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4019 cont:
4020                         idx++;
4021                 }
4022                 if (s_idx)
4023                         s_idx = 0;
4024         }
4025         cb->args[1] = 1;
4026 done:
4027         rcu_read_unlock();
4028         return skb->len;
4029 }
4030
4031 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4032 {
4033         struct nft_ctx *ctx_dump = NULL;
4034
4035         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4036         if (ctx_dump == NULL)
4037                 return -ENOMEM;
4038
4039         cb->data = ctx_dump;
4040         return 0;
4041 }
4042
4043 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4044 {
4045         kfree(cb->data);
4046         return 0;
4047 }
4048
4049 /* called with rcu_read_lock held */
4050 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4051                             const struct nlattr * const nla[])
4052 {
4053         const struct nfgenmsg *nfmsg = nlmsg_data(info->nlh);
4054         struct netlink_ext_ack *extack = info->extack;
4055         u8 genmask = nft_genmask_cur(info->net);
4056         struct net *net = info->net;
4057         const struct nft_set *set;
4058         struct sk_buff *skb2;
4059         struct nft_ctx ctx;
4060         int err;
4061
4062         /* Verify existence before starting dump */
4063         err = nft_ctx_init_from_setattr(&ctx, net, skb, info->nlh, nla, extack,
4064                                         genmask, 0);
4065         if (err < 0)
4066                 return err;
4067
4068         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4069                 struct netlink_dump_control c = {
4070                         .start = nf_tables_dump_sets_start,
4071                         .dump = nf_tables_dump_sets,
4072                         .done = nf_tables_dump_sets_done,
4073                         .data = &ctx,
4074                         .module = THIS_MODULE,
4075                 };
4076
4077                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4078         }
4079
4080         /* Only accept unspec with dump */
4081         if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4082                 return -EAFNOSUPPORT;
4083         if (!nla[NFTA_SET_TABLE])
4084                 return -EINVAL;
4085
4086         set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
4087         if (IS_ERR(set))
4088                 return PTR_ERR(set);
4089
4090         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4091         if (skb2 == NULL)
4092                 return -ENOMEM;
4093
4094         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4095         if (err < 0)
4096                 goto err_fill_set_info;
4097
4098         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4099
4100 err_fill_set_info:
4101         kfree_skb(skb2);
4102         return err;
4103 }
4104
4105 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4106         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4107 };
4108
4109 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4110                                      struct nft_set_desc *desc)
4111 {
4112         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4113         u32 len;
4114         int err;
4115
4116         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4117                                           nft_concat_policy, NULL);
4118         if (err < 0)
4119                 return err;
4120
4121         if (!tb[NFTA_SET_FIELD_LEN])
4122                 return -EINVAL;
4123
4124         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4125
4126         if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
4127                 return -E2BIG;
4128
4129         desc->field_len[desc->field_count++] = len;
4130
4131         return 0;
4132 }
4133
4134 static int nft_set_desc_concat(struct nft_set_desc *desc,
4135                                const struct nlattr *nla)
4136 {
4137         struct nlattr *attr;
4138         int rem, err;
4139
4140         nla_for_each_nested(attr, nla, rem) {
4141                 if (nla_type(attr) != NFTA_LIST_ELEM)
4142                         return -EINVAL;
4143
4144                 err = nft_set_desc_concat_parse(attr, desc);
4145                 if (err < 0)
4146                         return err;
4147         }
4148
4149         return 0;
4150 }
4151
4152 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4153                                     const struct nlattr *nla)
4154 {
4155         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4156         int err;
4157
4158         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4159                                           nft_set_desc_policy, NULL);
4160         if (err < 0)
4161                 return err;
4162
4163         if (da[NFTA_SET_DESC_SIZE] != NULL)
4164                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4165         if (da[NFTA_SET_DESC_CONCAT])
4166                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4167
4168         return err;
4169 }
4170
4171 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4172                             const struct nlattr * const nla[])
4173 {
4174         const struct nfgenmsg *nfmsg = nlmsg_data(info->nlh);
4175         u32 ktype, dtype, flags, policy, gc_int, objtype;
4176         struct netlink_ext_ack *extack = info->extack;
4177         u8 genmask = nft_genmask_next(info->net);
4178         int family = nfmsg->nfgen_family;
4179         const struct nft_set_ops *ops;
4180         struct nft_expr *expr = NULL;
4181         struct net *net = info->net;
4182         struct nft_set_desc desc;
4183         struct nft_table *table;
4184         unsigned char *udata;
4185         struct nft_set *set;
4186         struct nft_ctx ctx;
4187         size_t alloc_size;
4188         u64 timeout;
4189         char *name;
4190         int err, i;
4191         u16 udlen;
4192         u64 size;
4193
4194         if (nla[NFTA_SET_TABLE] == NULL ||
4195             nla[NFTA_SET_NAME] == NULL ||
4196             nla[NFTA_SET_KEY_LEN] == NULL ||
4197             nla[NFTA_SET_ID] == NULL)
4198                 return -EINVAL;
4199
4200         memset(&desc, 0, sizeof(desc));
4201
4202         ktype = NFT_DATA_VALUE;
4203         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4204                 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4205                 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4206                         return -EINVAL;
4207         }
4208
4209         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4210         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4211                 return -EINVAL;
4212
4213         flags = 0;
4214         if (nla[NFTA_SET_FLAGS] != NULL) {
4215                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4216                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4217                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4218                               NFT_SET_MAP | NFT_SET_EVAL |
4219                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4220                         return -EOPNOTSUPP;
4221                 /* Only one of these operations is supported */
4222                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4223                              (NFT_SET_MAP | NFT_SET_OBJECT))
4224                         return -EOPNOTSUPP;
4225                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4226                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4227                         return -EOPNOTSUPP;
4228         }
4229
4230         dtype = 0;
4231         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4232                 if (!(flags & NFT_SET_MAP))
4233                         return -EINVAL;
4234
4235                 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4236                 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4237                     dtype != NFT_DATA_VERDICT)
4238                         return -EINVAL;
4239
4240                 if (dtype != NFT_DATA_VERDICT) {
4241                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4242                                 return -EINVAL;
4243                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4244                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4245                                 return -EINVAL;
4246                 } else
4247                         desc.dlen = sizeof(struct nft_verdict);
4248         } else if (flags & NFT_SET_MAP)
4249                 return -EINVAL;
4250
4251         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4252                 if (!(flags & NFT_SET_OBJECT))
4253                         return -EINVAL;
4254
4255                 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4256                 if (objtype == NFT_OBJECT_UNSPEC ||
4257                     objtype > NFT_OBJECT_MAX)
4258                         return -EOPNOTSUPP;
4259         } else if (flags & NFT_SET_OBJECT)
4260                 return -EINVAL;
4261         else
4262                 objtype = NFT_OBJECT_UNSPEC;
4263
4264         timeout = 0;
4265         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4266                 if (!(flags & NFT_SET_TIMEOUT))
4267                         return -EINVAL;
4268
4269                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4270                 if (err)
4271                         return err;
4272         }
4273         gc_int = 0;
4274         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4275                 if (!(flags & NFT_SET_TIMEOUT))
4276                         return -EINVAL;
4277                 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4278         }
4279
4280         policy = NFT_SET_POL_PERFORMANCE;
4281         if (nla[NFTA_SET_POLICY] != NULL)
4282                 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4283
4284         if (nla[NFTA_SET_DESC] != NULL) {
4285                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4286                 if (err < 0)
4287                         return err;
4288         }
4289
4290         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4291                 desc.expr = true;
4292
4293         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4294                                  NETLINK_CB(skb).portid);
4295         if (IS_ERR(table)) {
4296                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4297                 return PTR_ERR(table);
4298         }
4299
4300         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4301
4302         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4303         if (IS_ERR(set)) {
4304                 if (PTR_ERR(set) != -ENOENT) {
4305                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4306                         return PTR_ERR(set);
4307                 }
4308         } else {
4309                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4310                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4311                         return -EEXIST;
4312                 }
4313                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4314                         return -EOPNOTSUPP;
4315
4316                 return 0;
4317         }
4318
4319         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4320                 return -ENOENT;
4321
4322         ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4323         if (IS_ERR(ops))
4324                 return PTR_ERR(ops);
4325
4326         udlen = 0;
4327         if (nla[NFTA_SET_USERDATA])
4328                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4329
4330         size = 0;
4331         if (ops->privsize != NULL)
4332                 size = ops->privsize(nla, &desc);
4333         alloc_size = sizeof(*set) + size + udlen;
4334         if (alloc_size < size)
4335                 return -ENOMEM;
4336         set = kvzalloc(alloc_size, GFP_KERNEL);
4337         if (!set)
4338                 return -ENOMEM;
4339
4340         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4341         if (!name) {
4342                 err = -ENOMEM;
4343                 goto err_set_name;
4344         }
4345
4346         err = nf_tables_set_alloc_name(&ctx, set, name);
4347         kfree(name);
4348         if (err < 0)
4349                 goto err_set_alloc_name;
4350
4351         if (nla[NFTA_SET_EXPR]) {
4352                 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4353                 if (IS_ERR(expr)) {
4354                         err = PTR_ERR(expr);
4355                         goto err_set_alloc_name;
4356                 }
4357                 set->exprs[0] = expr;
4358                 set->num_exprs++;
4359         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4360                 struct nft_expr *expr;
4361                 struct nlattr *tmp;
4362                 int left;
4363
4364                 if (!(flags & NFT_SET_EXPR)) {
4365                         err = -EINVAL;
4366                         goto err_set_alloc_name;
4367                 }
4368                 i = 0;
4369                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4370                         if (i == NFT_SET_EXPR_MAX) {
4371                                 err = -E2BIG;
4372                                 goto err_set_init;
4373                         }
4374                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4375                                 err = -EINVAL;
4376                                 goto err_set_init;
4377                         }
4378                         expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
4379                         if (IS_ERR(expr)) {
4380                                 err = PTR_ERR(expr);
4381                                 goto err_set_init;
4382                         }
4383                         set->exprs[i++] = expr;
4384                         set->num_exprs++;
4385                 }
4386         }
4387
4388         udata = NULL;
4389         if (udlen) {
4390                 udata = set->data + size;
4391                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4392         }
4393
4394         INIT_LIST_HEAD(&set->bindings);
4395         INIT_LIST_HEAD(&set->catchall_list);
4396         set->table = table;
4397         write_pnet(&set->net, net);
4398         set->ops   = ops;
4399         set->ktype = ktype;
4400         set->klen  = desc.klen;
4401         set->dtype = dtype;
4402         set->objtype = objtype;
4403         set->dlen  = desc.dlen;
4404         set->flags = flags;
4405         set->size  = desc.size;
4406         set->policy = policy;
4407         set->udlen  = udlen;
4408         set->udata  = udata;
4409         set->timeout = timeout;
4410         set->gc_int = gc_int;
4411         set->handle = nf_tables_alloc_handle(table);
4412
4413         set->field_count = desc.field_count;
4414         for (i = 0; i < desc.field_count; i++)
4415                 set->field_len[i] = desc.field_len[i];
4416
4417         err = ops->init(set, &desc, nla);
4418         if (err < 0)
4419                 goto err_set_init;
4420
4421         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4422         if (err < 0)
4423                 goto err_set_trans;
4424
4425         list_add_tail_rcu(&set->list, &table->sets);
4426         table->use++;
4427         return 0;
4428
4429 err_set_trans:
4430         ops->destroy(set);
4431 err_set_init:
4432         for (i = 0; i < set->num_exprs; i++)
4433                 nft_expr_destroy(&ctx, set->exprs[i]);
4434 err_set_alloc_name:
4435         kfree(set->name);
4436 err_set_name:
4437         kvfree(set);
4438         return err;
4439 }
4440
4441 struct nft_set_elem_catchall {
4442         struct list_head        list;
4443         struct rcu_head         rcu;
4444         void                    *elem;
4445 };
4446
4447 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4448                                      struct nft_set *set)
4449 {
4450         struct nft_set_elem_catchall *catchall;
4451
4452         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4453                 list_del_rcu(&catchall->list);
4454                 nft_set_elem_destroy(set, catchall->elem, true);
4455                 kfree_rcu(catchall);
4456         }
4457 }
4458
4459 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4460 {
4461         int i;
4462
4463         if (WARN_ON(set->use > 0))
4464                 return;
4465
4466         for (i = 0; i < set->num_exprs; i++)
4467                 nft_expr_destroy(ctx, set->exprs[i]);
4468
4469         set->ops->destroy(set);
4470         nft_set_catchall_destroy(ctx, set);
4471         kfree(set->name);
4472         kvfree(set);
4473 }
4474
4475 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4476                             const struct nlattr * const nla[])
4477 {
4478         const struct nfgenmsg *nfmsg = nlmsg_data(info->nlh);
4479         struct netlink_ext_ack *extack = info->extack;
4480         u8 genmask = nft_genmask_next(info->net);
4481         struct net *net = info->net;
4482         const struct nlattr *attr;
4483         struct nft_set *set;
4484         struct nft_ctx ctx;
4485         int err;
4486
4487         if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4488                 return -EAFNOSUPPORT;
4489         if (nla[NFTA_SET_TABLE] == NULL)
4490                 return -EINVAL;
4491
4492         err = nft_ctx_init_from_setattr(&ctx, net, skb, info->nlh, nla, extack,
4493                                         genmask, NETLINK_CB(skb).portid);
4494         if (err < 0)
4495                 return err;
4496
4497         if (nla[NFTA_SET_HANDLE]) {
4498                 attr = nla[NFTA_SET_HANDLE];
4499                 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
4500         } else {
4501                 attr = nla[NFTA_SET_NAME];
4502                 set = nft_set_lookup(ctx.table, attr, genmask);
4503         }
4504
4505         if (IS_ERR(set)) {
4506                 NL_SET_BAD_ATTR(extack, attr);
4507                 return PTR_ERR(set);
4508         }
4509         if (set->use ||
4510             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4511              atomic_read(&set->nelems) > 0)) {
4512                 NL_SET_BAD_ATTR(extack, attr);
4513                 return -EBUSY;
4514         }
4515
4516         return nft_delset(&ctx, set);
4517 }
4518
4519 static int nft_validate_register_store(const struct nft_ctx *ctx,
4520                                        enum nft_registers reg,
4521                                        const struct nft_data *data,
4522                                        enum nft_data_types type,
4523                                        unsigned int len);
4524
4525 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4526                                      struct nft_set *set,
4527                                      struct nft_set_elem *elem)
4528 {
4529         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4530         enum nft_registers dreg;
4531
4532         dreg = nft_type_to_reg(set->dtype);
4533         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4534                                            set->dtype == NFT_DATA_VERDICT ?
4535                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4536                                            set->dlen);
4537 }
4538
4539 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4540                                         struct nft_set *set,
4541                                         const struct nft_set_iter *iter,
4542                                         struct nft_set_elem *elem)
4543 {
4544         return nft_setelem_data_validate(ctx, set, elem);
4545 }
4546
4547 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4548                                        struct nft_set *set)
4549 {
4550         u8 genmask = nft_genmask_next(ctx->net);
4551         struct nft_set_elem_catchall *catchall;
4552         struct nft_set_elem elem;
4553         struct nft_set_ext *ext;
4554         int ret = 0;
4555
4556         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4557                 ext = nft_set_elem_ext(set, catchall->elem);
4558                 if (!nft_set_elem_active(ext, genmask))
4559                         continue;
4560
4561                 elem.priv = catchall->elem;
4562                 ret = nft_setelem_data_validate(ctx, set, &elem);
4563                 if (ret < 0)
4564                         break;
4565         }
4566
4567         return ret;
4568 }
4569
4570 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4571                        struct nft_set_binding *binding)
4572 {
4573         struct nft_set_binding *i;
4574         struct nft_set_iter iter;
4575
4576         if (set->use == UINT_MAX)
4577                 return -EOVERFLOW;
4578
4579         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4580                 return -EBUSY;
4581
4582         if (binding->flags & NFT_SET_MAP) {
4583                 /* If the set is already bound to the same chain all
4584                  * jumps are already validated for that chain.
4585                  */
4586                 list_for_each_entry(i, &set->bindings, list) {
4587                         if (i->flags & NFT_SET_MAP &&
4588                             i->chain == binding->chain)
4589                                 goto bind;
4590                 }
4591
4592                 iter.genmask    = nft_genmask_next(ctx->net);
4593                 iter.skip       = 0;
4594                 iter.count      = 0;
4595                 iter.err        = 0;
4596                 iter.fn         = nf_tables_bind_check_setelem;
4597
4598                 set->ops->walk(ctx, set, &iter);
4599                 if (!iter.err)
4600                         iter.err = nft_set_catchall_bind_check(ctx, set);
4601
4602                 if (iter.err < 0)
4603                         return iter.err;
4604         }
4605 bind:
4606         binding->chain = ctx->chain;
4607         list_add_tail_rcu(&binding->list, &set->bindings);
4608         nft_set_trans_bind(ctx, set);
4609         set->use++;
4610
4611         return 0;
4612 }
4613 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4614
4615 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4616                                  struct nft_set_binding *binding, bool event)
4617 {
4618         list_del_rcu(&binding->list);
4619
4620         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4621                 list_del_rcu(&set->list);
4622                 if (event)
4623                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4624                                              GFP_KERNEL);
4625         }
4626 }
4627
4628 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4629                               struct nft_set_binding *binding,
4630                               enum nft_trans_phase phase)
4631 {
4632         switch (phase) {
4633         case NFT_TRANS_PREPARE:
4634                 set->use--;
4635                 return;
4636         case NFT_TRANS_ABORT:
4637         case NFT_TRANS_RELEASE:
4638                 set->use--;
4639                 fallthrough;
4640         default:
4641                 nf_tables_unbind_set(ctx, set, binding,
4642                                      phase == NFT_TRANS_COMMIT);
4643         }
4644 }
4645 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4646
4647 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4648 {
4649         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4650                 nft_set_destroy(ctx, set);
4651 }
4652 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4653
4654 const struct nft_set_ext_type nft_set_ext_types[] = {
4655         [NFT_SET_EXT_KEY]               = {
4656                 .align  = __alignof__(u32),
4657         },
4658         [NFT_SET_EXT_DATA]              = {
4659                 .align  = __alignof__(u32),
4660         },
4661         [NFT_SET_EXT_EXPRESSIONS]       = {
4662                 .align  = __alignof__(struct nft_set_elem_expr),
4663         },
4664         [NFT_SET_EXT_OBJREF]            = {
4665                 .len    = sizeof(struct nft_object *),
4666                 .align  = __alignof__(struct nft_object *),
4667         },
4668         [NFT_SET_EXT_FLAGS]             = {
4669                 .len    = sizeof(u8),
4670                 .align  = __alignof__(u8),
4671         },
4672         [NFT_SET_EXT_TIMEOUT]           = {
4673                 .len    = sizeof(u64),
4674                 .align  = __alignof__(u64),
4675         },
4676         [NFT_SET_EXT_EXPIRATION]        = {
4677                 .len    = sizeof(u64),
4678                 .align  = __alignof__(u64),
4679         },
4680         [NFT_SET_EXT_USERDATA]          = {
4681                 .len    = sizeof(struct nft_userdata),
4682                 .align  = __alignof__(struct nft_userdata),
4683         },
4684         [NFT_SET_EXT_KEY_END]           = {
4685                 .align  = __alignof__(u32),
4686         },
4687 };
4688
4689 /*
4690  * Set elements
4691  */
4692
4693 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4694         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
4695         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
4696         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
4697         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
4698         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
4699         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
4700                                             .len = NFT_USERDATA_MAXLEN },
4701         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
4702         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
4703                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
4704         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
4705         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
4706 };
4707
4708 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4709         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
4710                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4711         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
4712                                             .len = NFT_SET_MAXNAMELEN - 1 },
4713         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
4714         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
4715 };
4716
4717 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
4718                                       const struct sk_buff *skb,
4719                                       const struct nlmsghdr *nlh,
4720                                       const struct nlattr * const nla[],
4721                                       struct netlink_ext_ack *extack,
4722                                       u8 genmask, u32 nlpid)
4723 {
4724         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4725         int family = nfmsg->nfgen_family;
4726         struct nft_table *table;
4727
4728         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
4729                                  genmask, nlpid);
4730         if (IS_ERR(table)) {
4731                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
4732                 return PTR_ERR(table);
4733         }
4734
4735         nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
4736         return 0;
4737 }
4738
4739 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4740                                   const struct nft_set *set,
4741                                   const struct nft_set_ext *ext)
4742 {
4743         struct nft_set_elem_expr *elem_expr;
4744         u32 size, num_exprs = 0;
4745         struct nft_expr *expr;
4746         struct nlattr *nest;
4747
4748         elem_expr = nft_set_ext_expr(ext);
4749         nft_setelem_expr_foreach(expr, elem_expr, size)
4750                 num_exprs++;
4751
4752         if (num_exprs == 1) {
4753                 expr = nft_setelem_expr_at(elem_expr, 0);
4754                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4755                         return -1;
4756
4757                 return 0;
4758         } else if (num_exprs > 1) {
4759                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4760                 if (nest == NULL)
4761                         goto nla_put_failure;
4762
4763                 nft_setelem_expr_foreach(expr, elem_expr, size) {
4764                         expr = nft_setelem_expr_at(elem_expr, size);
4765                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4766                                 goto nla_put_failure;
4767                 }
4768                 nla_nest_end(skb, nest);
4769         }
4770         return 0;
4771
4772 nla_put_failure:
4773         return -1;
4774 }
4775
4776 static int nf_tables_fill_setelem(struct sk_buff *skb,
4777                                   const struct nft_set *set,
4778                                   const struct nft_set_elem *elem)
4779 {
4780         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4781         unsigned char *b = skb_tail_pointer(skb);
4782         struct nlattr *nest;
4783
4784         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4785         if (nest == NULL)
4786                 goto nla_put_failure;
4787
4788         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
4789             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4790                           NFT_DATA_VALUE, set->klen) < 0)
4791                 goto nla_put_failure;
4792
4793         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4794             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4795                           NFT_DATA_VALUE, set->klen) < 0)
4796                 goto nla_put_failure;
4797
4798         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4799             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4800                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4801                           set->dlen) < 0)
4802                 goto nla_put_failure;
4803
4804         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4805             nft_set_elem_expr_dump(skb, set, ext))
4806                 goto nla_put_failure;
4807
4808         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4809             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4810                            (*nft_set_ext_obj(ext))->key.name) < 0)
4811                 goto nla_put_failure;
4812
4813         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4814             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4815                          htonl(*nft_set_ext_flags(ext))))
4816                 goto nla_put_failure;
4817
4818         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4819             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4820                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4821                          NFTA_SET_ELEM_PAD))
4822                 goto nla_put_failure;
4823
4824         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4825                 u64 expires, now = get_jiffies_64();
4826
4827                 expires = *nft_set_ext_expiration(ext);
4828                 if (time_before64(now, expires))
4829                         expires -= now;
4830                 else
4831                         expires = 0;
4832
4833                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4834                                  nf_jiffies64_to_msecs(expires),
4835                                  NFTA_SET_ELEM_PAD))
4836                         goto nla_put_failure;
4837         }
4838
4839         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4840                 struct nft_userdata *udata;
4841
4842                 udata = nft_set_ext_userdata(ext);
4843                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4844                             udata->len + 1, udata->data))
4845                         goto nla_put_failure;
4846         }
4847
4848         nla_nest_end(skb, nest);
4849         return 0;
4850
4851 nla_put_failure:
4852         nlmsg_trim(skb, b);
4853         return -EMSGSIZE;
4854 }
4855
4856 struct nft_set_dump_args {
4857         const struct netlink_callback   *cb;
4858         struct nft_set_iter             iter;
4859         struct sk_buff                  *skb;
4860 };
4861
4862 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4863                                   struct nft_set *set,
4864                                   const struct nft_set_iter *iter,
4865                                   struct nft_set_elem *elem)
4866 {
4867         struct nft_set_dump_args *args;
4868
4869         args = container_of(iter, struct nft_set_dump_args, iter);
4870         return nf_tables_fill_setelem(args->skb, set, elem);
4871 }
4872
4873 struct nft_set_dump_ctx {
4874         const struct nft_set    *set;
4875         struct nft_ctx          ctx;
4876 };
4877
4878 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
4879                                  const struct nft_set *set)
4880 {
4881         struct nft_set_elem_catchall *catchall;
4882         u8 genmask = nft_genmask_cur(net);
4883         struct nft_set_elem elem;
4884         struct nft_set_ext *ext;
4885         int ret = 0;
4886
4887         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4888                 ext = nft_set_elem_ext(set, catchall->elem);
4889                 if (!nft_set_elem_active(ext, genmask) ||
4890                     nft_set_elem_expired(ext))
4891                         continue;
4892
4893                 elem.priv = catchall->elem;
4894                 ret = nf_tables_fill_setelem(skb, set, &elem);
4895                 break;
4896         }
4897
4898         return ret;
4899 }
4900
4901 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4902 {
4903         struct nft_set_dump_ctx *dump_ctx = cb->data;
4904         struct net *net = sock_net(skb->sk);
4905         struct nftables_pernet *nft_net;
4906         struct nft_table *table;
4907         struct nft_set *set;
4908         struct nft_set_dump_args args;
4909         bool set_found = false;
4910         struct nlmsghdr *nlh;
4911         struct nlattr *nest;
4912         u32 portid, seq;
4913         int event;
4914
4915         rcu_read_lock();
4916         nft_net = nft_pernet(net);
4917         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4918                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4919                     dump_ctx->ctx.family != table->family)
4920                         continue;
4921
4922                 if (table != dump_ctx->ctx.table)
4923                         continue;
4924
4925                 list_for_each_entry_rcu(set, &table->sets, list) {
4926                         if (set == dump_ctx->set) {
4927                                 set_found = true;
4928                                 break;
4929                         }
4930                 }
4931                 break;
4932         }
4933
4934         if (!set_found) {
4935                 rcu_read_unlock();
4936                 return -ENOENT;
4937         }
4938
4939         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4940         portid = NETLINK_CB(cb->skb).portid;
4941         seq    = cb->nlh->nlmsg_seq;
4942
4943         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
4944                            table->family, NFNETLINK_V0, nft_base_seq(net));
4945         if (!nlh)
4946                 goto nla_put_failure;
4947
4948         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4949                 goto nla_put_failure;
4950         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4951                 goto nla_put_failure;
4952
4953         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4954         if (nest == NULL)
4955                 goto nla_put_failure;
4956
4957         args.cb                 = cb;
4958         args.skb                = skb;
4959         args.iter.genmask       = nft_genmask_cur(net);
4960         args.iter.skip          = cb->args[0];
4961         args.iter.count         = 0;
4962         args.iter.err           = 0;
4963         args.iter.fn            = nf_tables_dump_setelem;
4964         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4965
4966         if (!args.iter.err && args.iter.count == cb->args[0])
4967                 args.iter.err = nft_set_catchall_dump(net, skb, set);
4968         rcu_read_unlock();
4969
4970         nla_nest_end(skb, nest);
4971         nlmsg_end(skb, nlh);
4972
4973         if (args.iter.err && args.iter.err != -EMSGSIZE)
4974                 return args.iter.err;
4975         if (args.iter.count == cb->args[0])
4976                 return 0;
4977
4978         cb->args[0] = args.iter.count;
4979         return skb->len;
4980
4981 nla_put_failure:
4982         rcu_read_unlock();
4983         return -ENOSPC;
4984 }
4985
4986 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4987 {
4988         struct nft_set_dump_ctx *dump_ctx = cb->data;
4989
4990         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4991
4992         return cb->data ? 0 : -ENOMEM;
4993 }
4994
4995 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4996 {
4997         kfree(cb->data);
4998         return 0;
4999 }
5000
5001 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5002                                        const struct nft_ctx *ctx, u32 seq,
5003                                        u32 portid, int event, u16 flags,
5004                                        const struct nft_set *set,
5005                                        const struct nft_set_elem *elem)
5006 {
5007         struct nlmsghdr *nlh;
5008         struct nlattr *nest;
5009         int err;
5010
5011         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5012         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5013                            NFNETLINK_V0, nft_base_seq(ctx->net));
5014         if (!nlh)
5015                 goto nla_put_failure;
5016
5017         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5018                 goto nla_put_failure;
5019         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5020                 goto nla_put_failure;
5021
5022         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5023         if (nest == NULL)
5024                 goto nla_put_failure;
5025
5026         err = nf_tables_fill_setelem(skb, set, elem);
5027         if (err < 0)
5028                 goto nla_put_failure;
5029
5030         nla_nest_end(skb, nest);
5031
5032         nlmsg_end(skb, nlh);
5033         return 0;
5034
5035 nla_put_failure:
5036         nlmsg_trim(skb, nlh);
5037         return -1;
5038 }
5039
5040 static int nft_setelem_parse_flags(const struct nft_set *set,
5041                                    const struct nlattr *attr, u32 *flags)
5042 {
5043         if (attr == NULL)
5044                 return 0;
5045
5046         *flags = ntohl(nla_get_be32(attr));
5047         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5048                 return -EOPNOTSUPP;
5049         if (!(set->flags & NFT_SET_INTERVAL) &&
5050             *flags & NFT_SET_ELEM_INTERVAL_END)
5051                 return -EINVAL;
5052
5053         return 0;
5054 }
5055
5056 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5057                                  struct nft_data *key, struct nlattr *attr)
5058 {
5059         struct nft_data_desc desc;
5060         int err;
5061
5062         err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
5063         if (err < 0)
5064                 return err;
5065
5066         if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
5067                 nft_data_release(key, desc.type);
5068                 return -EINVAL;
5069         }
5070
5071         return 0;
5072 }
5073
5074 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5075                                   struct nft_data_desc *desc,
5076                                   struct nft_data *data,
5077                                   struct nlattr *attr)
5078 {
5079         int err;
5080
5081         err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
5082         if (err < 0)
5083                 return err;
5084
5085         if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
5086                 nft_data_release(data, desc->type);
5087                 return -EINVAL;
5088         }
5089
5090         return 0;
5091 }
5092
5093 static void *nft_setelem_catchall_get(const struct net *net,
5094                                       const struct nft_set *set)
5095 {
5096         struct nft_set_elem_catchall *catchall;
5097         u8 genmask = nft_genmask_cur(net);
5098         struct nft_set_ext *ext;
5099         void *priv = NULL;
5100
5101         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5102                 ext = nft_set_elem_ext(set, catchall->elem);
5103                 if (!nft_set_elem_active(ext, genmask) ||
5104                     nft_set_elem_expired(ext))
5105                         continue;
5106
5107                 priv = catchall->elem;
5108                 break;
5109         }
5110
5111         return priv;
5112 }
5113
5114 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5115                            struct nft_set_elem *elem, u32 flags)
5116 {
5117         void *priv;
5118
5119         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5120                 priv = set->ops->get(ctx->net, set, elem, flags);
5121                 if (IS_ERR(priv))
5122                         return PTR_ERR(priv);
5123         } else {
5124                 priv = nft_setelem_catchall_get(ctx->net, set);
5125                 if (!priv)
5126                         return -ENOENT;
5127         }
5128         elem->priv = priv;
5129
5130         return 0;
5131 }
5132
5133 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5134                             const struct nlattr *attr)
5135 {
5136         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5137         struct nft_set_elem elem;
5138         struct sk_buff *skb;
5139         uint32_t flags = 0;
5140         int err;
5141
5142         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5143                                           nft_set_elem_policy, NULL);
5144         if (err < 0)
5145                 return err;
5146
5147         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5148         if (err < 0)
5149                 return err;
5150
5151         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5152                 return -EINVAL;
5153
5154         if (nla[NFTA_SET_ELEM_KEY]) {
5155                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5156                                             nla[NFTA_SET_ELEM_KEY]);
5157                 if (err < 0)
5158                         return err;
5159         }
5160
5161         if (nla[NFTA_SET_ELEM_KEY_END]) {
5162                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5163                                             nla[NFTA_SET_ELEM_KEY_END]);
5164                 if (err < 0)
5165                         return err;
5166         }
5167
5168         err = nft_setelem_get(ctx, set, &elem, flags);
5169         if (err < 0)
5170                 return err;
5171
5172         err = -ENOMEM;
5173         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5174         if (skb == NULL)
5175                 return err;
5176
5177         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5178                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
5179         if (err < 0)
5180                 goto err_fill_setelem;
5181
5182         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5183
5184 err_fill_setelem:
5185         kfree_skb(skb);
5186         return err;
5187 }
5188
5189 /* called with rcu_read_lock held */
5190 static int nf_tables_getsetelem(struct sk_buff *skb,
5191                                 const struct nfnl_info *info,
5192                                 const struct nlattr * const nla[])
5193 {
5194         struct netlink_ext_ack *extack = info->extack;
5195         u8 genmask = nft_genmask_cur(info->net);
5196         struct net *net = info->net;
5197         struct nft_set *set;
5198         struct nlattr *attr;
5199         struct nft_ctx ctx;
5200         int rem, err = 0;
5201
5202         err = nft_ctx_init_from_elemattr(&ctx, net, skb, info->nlh, nla, extack,
5203                                          genmask, NETLINK_CB(skb).portid);
5204         if (err < 0)
5205                 return err;
5206
5207         set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5208         if (IS_ERR(set))
5209                 return PTR_ERR(set);
5210
5211         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5212                 struct netlink_dump_control c = {
5213                         .start = nf_tables_dump_set_start,
5214                         .dump = nf_tables_dump_set,
5215                         .done = nf_tables_dump_set_done,
5216                         .module = THIS_MODULE,
5217                 };
5218                 struct nft_set_dump_ctx dump_ctx = {
5219                         .set = set,
5220                         .ctx = ctx,
5221                 };
5222
5223                 c.data = &dump_ctx;
5224                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5225         }
5226
5227         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5228                 return -EINVAL;
5229
5230         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5231                 err = nft_get_set_elem(&ctx, set, attr);
5232                 if (err < 0)
5233                         break;
5234         }
5235
5236         return err;
5237 }
5238
5239 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5240                                      const struct nft_set *set,
5241                                      const struct nft_set_elem *elem,
5242                                      int event, u16 flags)
5243 {
5244         struct nftables_pernet *nft_net;
5245         struct net *net = ctx->net;
5246         u32 portid = ctx->portid;
5247         struct sk_buff *skb;
5248         int err;
5249
5250         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5251                 return;
5252
5253         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5254         if (skb == NULL)
5255                 goto err;
5256
5257         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5258                                           set, elem);
5259         if (err < 0) {
5260                 kfree_skb(skb);
5261                 goto err;
5262         }
5263
5264         nft_net = nft_pernet(net);
5265         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5266         return;
5267 err:
5268         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5269 }
5270
5271 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5272                                               int msg_type,
5273                                               struct nft_set *set)
5274 {
5275         struct nft_trans *trans;
5276
5277         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5278         if (trans == NULL)
5279                 return NULL;
5280
5281         nft_trans_elem_set(trans) = set;
5282         return trans;
5283 }
5284
5285 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5286                                          const struct nft_set *set,
5287                                          const struct nlattr *attr)
5288 {
5289         struct nft_expr *expr;
5290         int err;
5291
5292         expr = nft_expr_init(ctx, attr);
5293         if (IS_ERR(expr))
5294                 return expr;
5295
5296         err = -EOPNOTSUPP;
5297         if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL))
5298                 goto err_set_elem_expr;
5299
5300         if (expr->ops->type->flags & NFT_EXPR_GC) {
5301                 if (set->flags & NFT_SET_TIMEOUT)
5302                         goto err_set_elem_expr;
5303                 if (!set->ops->gc_init)
5304                         goto err_set_elem_expr;
5305                 set->ops->gc_init(set);
5306         }
5307
5308         return expr;
5309
5310 err_set_elem_expr:
5311         nft_expr_destroy(ctx, expr);
5312         return ERR_PTR(err);
5313 }
5314
5315 void *nft_set_elem_init(const struct nft_set *set,
5316                         const struct nft_set_ext_tmpl *tmpl,
5317                         const u32 *key, const u32 *key_end,
5318                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5319 {
5320         struct nft_set_ext *ext;
5321         void *elem;
5322
5323         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5324         if (elem == NULL)
5325                 return NULL;
5326
5327         ext = nft_set_elem_ext(set, elem);
5328         nft_set_ext_init(ext, tmpl);
5329
5330         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY))
5331                 memcpy(nft_set_ext_key(ext), key, set->klen);
5332         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5333                 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5334         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5335                 memcpy(nft_set_ext_data(ext), data, set->dlen);
5336         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5337                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5338                 if (expiration == 0)
5339                         *nft_set_ext_expiration(ext) += timeout;
5340         }
5341         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5342                 *nft_set_ext_timeout(ext) = timeout;
5343
5344         return elem;
5345 }
5346
5347 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5348                                         struct nft_expr *expr)
5349 {
5350         if (expr->ops->destroy_clone) {
5351                 expr->ops->destroy_clone(ctx, expr);
5352                 module_put(expr->ops->type->owner);
5353         } else {
5354                 nf_tables_expr_destroy(ctx, expr);
5355         }
5356 }
5357
5358 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5359                                       struct nft_set_elem_expr *elem_expr)
5360 {
5361         struct nft_expr *expr;
5362         u32 size;
5363
5364         nft_setelem_expr_foreach(expr, elem_expr, size)
5365                 __nft_set_elem_expr_destroy(ctx, expr);
5366 }
5367
5368 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5369                           bool destroy_expr)
5370 {
5371         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5372         struct nft_ctx ctx = {
5373                 .net    = read_pnet(&set->net),
5374                 .family = set->table->family,
5375         };
5376
5377         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5378         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5379                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5380         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5381                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5382
5383         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5384                 (*nft_set_ext_obj(ext))->use--;
5385         kfree(elem);
5386 }
5387 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5388
5389 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5390  * with the refcounting from the preparation phase.
5391  */
5392 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5393                                        const struct nft_set *set, void *elem)
5394 {
5395         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5396
5397         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5398                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5399
5400         kfree(elem);
5401 }
5402
5403 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5404                             struct nft_expr *expr_array[])
5405 {
5406         struct nft_expr *expr;
5407         int err, i, k;
5408
5409         for (i = 0; i < set->num_exprs; i++) {
5410                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL);
5411                 if (!expr)
5412                         goto err_expr;
5413
5414                 err = nft_expr_clone(expr, set->exprs[i]);
5415                 if (err < 0) {
5416                         nft_expr_destroy(ctx, expr);
5417                         goto err_expr;
5418                 }
5419                 expr_array[i] = expr;
5420         }
5421
5422         return 0;
5423
5424 err_expr:
5425         for (k = i - 1; k >= 0; k--)
5426                 nft_expr_destroy(ctx, expr_array[k]);
5427
5428         return -ENOMEM;
5429 }
5430
5431 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5432                                    const struct nft_set_ext *ext,
5433                                    struct nft_expr *expr_array[],
5434                                    u32 num_exprs)
5435 {
5436         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5437         struct nft_expr *expr;
5438         int i, err;
5439
5440         for (i = 0; i < num_exprs; i++) {
5441                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5442                 err = nft_expr_clone(expr, expr_array[i]);
5443                 if (err < 0)
5444                         goto err_elem_expr_setup;
5445
5446                 elem_expr->size += expr_array[i]->ops->size;
5447                 nft_expr_destroy(ctx, expr_array[i]);
5448                 expr_array[i] = NULL;
5449         }
5450
5451         return 0;
5452
5453 err_elem_expr_setup:
5454         for (; i < num_exprs; i++) {
5455                 nft_expr_destroy(ctx, expr_array[i]);
5456                 expr_array[i] = NULL;
5457         }
5458
5459         return -ENOMEM;
5460 }
5461
5462 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5463                                             const struct nft_set *set)
5464 {
5465         struct nft_set_elem_catchall *catchall;
5466         u8 genmask = nft_genmask_cur(net);
5467         struct nft_set_ext *ext;
5468
5469         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5470                 ext = nft_set_elem_ext(set, catchall->elem);
5471                 if (nft_set_elem_active(ext, genmask) &&
5472                     !nft_set_elem_expired(ext))
5473                         return ext;
5474         }
5475
5476         return NULL;
5477 }
5478 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5479
5480 void *nft_set_catchall_gc(const struct nft_set *set)
5481 {
5482         struct nft_set_elem_catchall *catchall, *next;
5483         struct nft_set_ext *ext;
5484         void *elem = NULL;
5485
5486         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5487                 ext = nft_set_elem_ext(set, catchall->elem);
5488
5489                 if (!nft_set_elem_expired(ext) ||
5490                     nft_set_elem_mark_busy(ext))
5491                         continue;
5492
5493                 elem = catchall->elem;
5494                 list_del_rcu(&catchall->list);
5495                 kfree_rcu(catchall, rcu);
5496                 break;
5497         }
5498
5499         return elem;
5500 }
5501 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5502
5503 static int nft_setelem_catchall_insert(const struct net *net,
5504                                        struct nft_set *set,
5505                                        const struct nft_set_elem *elem,
5506                                        struct nft_set_ext **pext)
5507 {
5508         struct nft_set_elem_catchall *catchall;
5509         u8 genmask = nft_genmask_next(net);
5510         struct nft_set_ext *ext;
5511
5512         list_for_each_entry(catchall, &set->catchall_list, list) {
5513                 ext = nft_set_elem_ext(set, catchall->elem);
5514                 if (nft_set_elem_active(ext, genmask)) {
5515                         *pext = ext;
5516                         return -EEXIST;
5517                 }
5518         }
5519
5520         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5521         if (!catchall)
5522                 return -ENOMEM;
5523
5524         catchall->elem = elem->priv;
5525         list_add_tail_rcu(&catchall->list, &set->catchall_list);
5526
5527         return 0;
5528 }
5529
5530 static int nft_setelem_insert(const struct net *net,
5531                               struct nft_set *set,
5532                               const struct nft_set_elem *elem,
5533                               struct nft_set_ext **ext, unsigned int flags)
5534 {
5535         int ret;
5536
5537         if (flags & NFT_SET_ELEM_CATCHALL)
5538                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5539         else
5540                 ret = set->ops->insert(net, set, elem, ext);
5541
5542         return ret;
5543 }
5544
5545 static bool nft_setelem_is_catchall(const struct nft_set *set,
5546                                     const struct nft_set_elem *elem)
5547 {
5548         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5549
5550         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5551             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5552                 return true;
5553
5554         return false;
5555 }
5556
5557 static void nft_setelem_activate(struct net *net, struct nft_set *set,
5558                                  struct nft_set_elem *elem)
5559 {
5560         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5561
5562         if (nft_setelem_is_catchall(set, elem)) {
5563                 nft_set_elem_change_active(net, set, ext);
5564                 nft_set_elem_clear_busy(ext);
5565         } else {
5566                 set->ops->activate(net, set, elem);
5567         }
5568 }
5569
5570 static int nft_setelem_catchall_deactivate(const struct net *net,
5571                                            struct nft_set *set,
5572                                            struct nft_set_elem *elem)
5573 {
5574         struct nft_set_elem_catchall *catchall;
5575         struct nft_set_ext *ext;
5576
5577         list_for_each_entry(catchall, &set->catchall_list, list) {
5578                 ext = nft_set_elem_ext(set, catchall->elem);
5579                 if (!nft_is_active(net, ext) ||
5580                     nft_set_elem_mark_busy(ext))
5581                         continue;
5582
5583                 kfree(elem->priv);
5584                 elem->priv = catchall->elem;
5585                 nft_set_elem_change_active(net, set, ext);
5586                 return 0;
5587         }
5588
5589         return -ENOENT;
5590 }
5591
5592 static int __nft_setelem_deactivate(const struct net *net,
5593                                     struct nft_set *set,
5594                                     struct nft_set_elem *elem)
5595 {
5596         void *priv;
5597
5598         priv = set->ops->deactivate(net, set, elem);
5599         if (!priv)
5600                 return -ENOENT;
5601
5602         kfree(elem->priv);
5603         elem->priv = priv;
5604         set->ndeact++;
5605
5606         return 0;
5607 }
5608
5609 static int nft_setelem_deactivate(const struct net *net,
5610                                   struct nft_set *set,
5611                                   struct nft_set_elem *elem, u32 flags)
5612 {
5613         int ret;
5614
5615         if (flags & NFT_SET_ELEM_CATCHALL)
5616                 ret = nft_setelem_catchall_deactivate(net, set, elem);
5617         else
5618                 ret = __nft_setelem_deactivate(net, set, elem);
5619
5620         return ret;
5621 }
5622
5623 static void nft_setelem_catchall_remove(const struct net *net,
5624                                         const struct nft_set *set,
5625                                         const struct nft_set_elem *elem)
5626 {
5627         struct nft_set_elem_catchall *catchall, *next;
5628
5629         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5630                 if (catchall->elem == elem->priv) {
5631                         list_del_rcu(&catchall->list);
5632                         kfree_rcu(catchall);
5633                         break;
5634                 }
5635         }
5636 }
5637
5638 static void nft_setelem_remove(const struct net *net,
5639                                const struct nft_set *set,
5640                                const struct nft_set_elem *elem)
5641 {
5642         if (nft_setelem_is_catchall(set, elem))
5643                 nft_setelem_catchall_remove(net, set, elem);
5644         else
5645                 set->ops->remove(net, set, elem);
5646 }
5647
5648 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5649                             const struct nlattr *attr, u32 nlmsg_flags)
5650 {
5651         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5652         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5653         u8 genmask = nft_genmask_next(ctx->net);
5654         u32 flags = 0, size = 0, num_exprs = 0;
5655         struct nft_set_ext_tmpl tmpl;
5656         struct nft_set_ext *ext, *ext2;
5657         struct nft_set_elem elem;
5658         struct nft_set_binding *binding;
5659         struct nft_object *obj = NULL;
5660         struct nft_userdata *udata;
5661         struct nft_data_desc desc;
5662         enum nft_registers dreg;
5663         struct nft_trans *trans;
5664         u64 timeout;
5665         u64 expiration;
5666         int err, i;
5667         u8 ulen;
5668
5669         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5670                                           nft_set_elem_policy, NULL);
5671         if (err < 0)
5672                 return err;
5673
5674         nft_set_ext_prepare(&tmpl);
5675
5676         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5677         if (err < 0)
5678                 return err;
5679
5680         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5681                 return -EINVAL;
5682
5683         if (flags != 0)
5684                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5685
5686         if (set->flags & NFT_SET_MAP) {
5687                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5688                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5689                         return -EINVAL;
5690         } else {
5691                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5692                         return -EINVAL;
5693         }
5694
5695         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5696              (nla[NFTA_SET_ELEM_DATA] ||
5697               nla[NFTA_SET_ELEM_OBJREF] ||
5698               nla[NFTA_SET_ELEM_TIMEOUT] ||
5699               nla[NFTA_SET_ELEM_EXPIRATION] ||
5700               nla[NFTA_SET_ELEM_USERDATA] ||
5701               nla[NFTA_SET_ELEM_EXPR] ||
5702               nla[NFTA_SET_ELEM_EXPRESSIONS]))
5703                 return -EINVAL;
5704
5705         timeout = 0;
5706         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5707                 if (!(set->flags & NFT_SET_TIMEOUT))
5708                         return -EINVAL;
5709                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5710                                             &timeout);
5711                 if (err)
5712                         return err;
5713         } else if (set->flags & NFT_SET_TIMEOUT) {
5714                 timeout = set->timeout;
5715         }
5716
5717         expiration = 0;
5718         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5719                 if (!(set->flags & NFT_SET_TIMEOUT))
5720                         return -EINVAL;
5721                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5722                                             &expiration);
5723                 if (err)
5724                         return err;
5725         }
5726
5727         if (nla[NFTA_SET_ELEM_EXPR]) {
5728                 struct nft_expr *expr;
5729
5730                 if (set->num_exprs && set->num_exprs != 1)
5731                         return -EOPNOTSUPP;
5732
5733                 expr = nft_set_elem_expr_alloc(ctx, set,
5734                                                nla[NFTA_SET_ELEM_EXPR]);
5735                 if (IS_ERR(expr))
5736                         return PTR_ERR(expr);
5737
5738                 expr_array[0] = expr;
5739                 num_exprs = 1;
5740
5741                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
5742                         err = -EOPNOTSUPP;
5743                         goto err_set_elem_expr;
5744                 }
5745         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5746                 struct nft_expr *expr;
5747                 struct nlattr *tmp;
5748                 int left;
5749
5750                 i = 0;
5751                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
5752                         if (i == NFT_SET_EXPR_MAX ||
5753                             (set->num_exprs && set->num_exprs == i)) {
5754                                 err = -E2BIG;
5755                                 goto err_set_elem_expr;
5756                         }
5757                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
5758                                 err = -EINVAL;
5759                                 goto err_set_elem_expr;
5760                         }
5761                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5762                         if (IS_ERR(expr)) {
5763                                 err = PTR_ERR(expr);
5764                                 goto err_set_elem_expr;
5765                         }
5766                         expr_array[i] = expr;
5767                         num_exprs++;
5768
5769                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
5770                                 err = -EOPNOTSUPP;
5771                                 goto err_set_elem_expr;
5772                         }
5773                         i++;
5774                 }
5775                 if (set->num_exprs && set->num_exprs != i) {
5776                         err = -EOPNOTSUPP;
5777                         goto err_set_elem_expr;
5778                 }
5779         } else if (set->num_exprs > 0) {
5780                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5781                 if (err < 0)
5782                         goto err_set_elem_expr_clone;
5783
5784                 num_exprs = set->num_exprs;
5785         }
5786
5787         if (nla[NFTA_SET_ELEM_KEY]) {
5788                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5789                                             nla[NFTA_SET_ELEM_KEY]);
5790                 if (err < 0)
5791                         goto err_set_elem_expr;
5792
5793                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5794         }
5795
5796         if (nla[NFTA_SET_ELEM_KEY_END]) {
5797                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5798                                             nla[NFTA_SET_ELEM_KEY_END]);
5799                 if (err < 0)
5800                         goto err_parse_key;
5801
5802                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5803         }
5804
5805         if (timeout > 0) {
5806                 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5807                 if (timeout != set->timeout)
5808                         nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5809         }
5810
5811         if (num_exprs) {
5812                 for (i = 0; i < num_exprs; i++)
5813                         size += expr_array[i]->ops->size;
5814
5815                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
5816                                        sizeof(struct nft_set_elem_expr) +
5817                                        size);
5818         }
5819
5820         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5821                 if (!(set->flags & NFT_SET_OBJECT)) {
5822                         err = -EINVAL;
5823                         goto err_parse_key_end;
5824                 }
5825                 obj = nft_obj_lookup(ctx->net, ctx->table,
5826                                      nla[NFTA_SET_ELEM_OBJREF],
5827                                      set->objtype, genmask);
5828                 if (IS_ERR(obj)) {
5829                         err = PTR_ERR(obj);
5830                         goto err_parse_key_end;
5831                 }
5832                 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5833         }
5834
5835         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5836                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5837                                              nla[NFTA_SET_ELEM_DATA]);
5838                 if (err < 0)
5839                         goto err_parse_key_end;
5840
5841                 dreg = nft_type_to_reg(set->dtype);
5842                 list_for_each_entry(binding, &set->bindings, list) {
5843                         struct nft_ctx bind_ctx = {
5844                                 .net    = ctx->net,
5845                                 .family = ctx->family,
5846                                 .table  = ctx->table,
5847                                 .chain  = (struct nft_chain *)binding->chain,
5848                         };
5849
5850                         if (!(binding->flags & NFT_SET_MAP))
5851                                 continue;
5852
5853                         err = nft_validate_register_store(&bind_ctx, dreg,
5854                                                           &elem.data.val,
5855                                                           desc.type, desc.len);
5856                         if (err < 0)
5857                                 goto err_parse_data;
5858
5859                         if (desc.type == NFT_DATA_VERDICT &&
5860                             (elem.data.val.verdict.code == NFT_GOTO ||
5861                              elem.data.val.verdict.code == NFT_JUMP))
5862                                 nft_validate_state_update(ctx->net,
5863                                                           NFT_VALIDATE_NEED);
5864                 }
5865
5866                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
5867         }
5868
5869         /* The full maximum length of userdata can exceed the maximum
5870          * offset value (U8_MAX) for following extensions, therefor it
5871          * must be the last extension added.
5872          */
5873         ulen = 0;
5874         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5875                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5876                 if (ulen > 0)
5877                         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5878                                                ulen);
5879         }
5880
5881         err = -ENOMEM;
5882         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5883                                       elem.key_end.val.data, elem.data.val.data,
5884                                       timeout, expiration, GFP_KERNEL);
5885         if (elem.priv == NULL)
5886                 goto err_parse_data;
5887
5888         ext = nft_set_elem_ext(set, elem.priv);
5889         if (flags)
5890                 *nft_set_ext_flags(ext) = flags;
5891         if (ulen > 0) {
5892                 udata = nft_set_ext_userdata(ext);
5893                 udata->len = ulen - 1;
5894                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5895         }
5896         if (obj) {
5897                 *nft_set_ext_obj(ext) = obj;
5898                 obj->use++;
5899         }
5900         err = nft_set_elem_expr_setup(ctx, ext, expr_array, num_exprs);
5901         if (err < 0)
5902                 goto err_elem_expr;
5903
5904         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5905         if (trans == NULL) {
5906                 err = -ENOMEM;
5907                 goto err_elem_expr;
5908         }
5909
5910         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
5911
5912         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
5913         if (err) {
5914                 if (err == -EEXIST) {
5915                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5916                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5917                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
5918                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
5919                                 goto err_element_clash;
5920                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5921                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5922                              memcmp(nft_set_ext_data(ext),
5923                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
5924                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5925                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5926                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
5927                                 goto err_element_clash;
5928                         else if (!(nlmsg_flags & NLM_F_EXCL))
5929                                 err = 0;
5930                 } else if (err == -ENOTEMPTY) {
5931                         /* ENOTEMPTY reports overlapping between this element
5932                          * and an existing one.
5933                          */
5934                         err = -EEXIST;
5935                 }
5936                 goto err_element_clash;
5937         }
5938
5939         if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
5940             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5941                 err = -ENFILE;
5942                 goto err_set_full;
5943         }
5944
5945         nft_trans_elem(trans) = elem;
5946         nft_trans_commit_list_add_tail(ctx->net, trans);
5947         return 0;
5948
5949 err_set_full:
5950         nft_setelem_remove(ctx->net, set, &elem);
5951 err_element_clash:
5952         kfree(trans);
5953 err_elem_expr:
5954         if (obj)
5955                 obj->use--;
5956
5957         nf_tables_set_elem_destroy(ctx, set, elem.priv);
5958 err_parse_data:
5959         if (nla[NFTA_SET_ELEM_DATA] != NULL)
5960                 nft_data_release(&elem.data.val, desc.type);
5961 err_parse_key_end:
5962         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
5963 err_parse_key:
5964         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5965 err_set_elem_expr:
5966         for (i = 0; i < num_exprs && expr_array[i]; i++)
5967                 nft_expr_destroy(ctx, expr_array[i]);
5968 err_set_elem_expr_clone:
5969         return err;
5970 }
5971
5972 static int nf_tables_newsetelem(struct sk_buff *skb,
5973                                 const struct nfnl_info *info,
5974                                 const struct nlattr * const nla[])
5975 {
5976         struct nftables_pernet *nft_net = nft_pernet(info->net);
5977         struct netlink_ext_ack *extack = info->extack;
5978         u8 genmask = nft_genmask_next(info->net);
5979         struct net *net = info->net;
5980         const struct nlattr *attr;
5981         struct nft_set *set;
5982         struct nft_ctx ctx;
5983         int rem, err;
5984
5985         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
5986                 return -EINVAL;
5987
5988         err = nft_ctx_init_from_elemattr(&ctx, net, skb, info->nlh, nla, extack,
5989                                          genmask, NETLINK_CB(skb).portid);
5990         if (err < 0)
5991                 return err;
5992
5993         set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
5994                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
5995         if (IS_ERR(set))
5996                 return PTR_ERR(set);
5997
5998         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5999                 return -EBUSY;
6000
6001         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6002                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6003                 if (err < 0)
6004                         return err;
6005         }
6006
6007         if (nft_net->validate_state == NFT_VALIDATE_DO)
6008                 return nft_table_validate(net, ctx.table);
6009
6010         return 0;
6011 }
6012
6013 /**
6014  *      nft_data_hold - hold a nft_data item
6015  *
6016  *      @data: struct nft_data to release
6017  *      @type: type of data
6018  *
6019  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6020  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6021  *      NFT_GOTO verdicts. This function must be called on active data objects
6022  *      from the second phase of the commit protocol.
6023  */
6024 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6025 {
6026         struct nft_chain *chain;
6027         struct nft_rule *rule;
6028
6029         if (type == NFT_DATA_VERDICT) {
6030                 switch (data->verdict.code) {
6031                 case NFT_JUMP:
6032                 case NFT_GOTO:
6033                         chain = data->verdict.chain;
6034                         chain->use++;
6035
6036                         if (!nft_chain_is_bound(chain))
6037                                 break;
6038
6039                         chain->table->use++;
6040                         list_for_each_entry(rule, &chain->rules, list)
6041                                 chain->use++;
6042
6043                         nft_chain_add(chain->table, chain);
6044                         break;
6045                 }
6046         }
6047 }
6048
6049 static void nft_setelem_data_activate(const struct net *net,
6050                                       const struct nft_set *set,
6051                                       struct nft_set_elem *elem)
6052 {
6053         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6054
6055         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6056                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6057         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6058                 (*nft_set_ext_obj(ext))->use++;
6059 }
6060
6061 static void nft_setelem_data_deactivate(const struct net *net,
6062                                         const struct nft_set *set,
6063                                         struct nft_set_elem *elem)
6064 {
6065         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6066
6067         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6068                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6069         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6070                 (*nft_set_ext_obj(ext))->use--;
6071 }
6072
6073 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6074                            const struct nlattr *attr)
6075 {
6076         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6077         struct nft_set_ext_tmpl tmpl;
6078         struct nft_set_elem elem;
6079         struct nft_set_ext *ext;
6080         struct nft_trans *trans;
6081         u32 flags = 0;
6082         int err;
6083
6084         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6085                                           nft_set_elem_policy, NULL);
6086         if (err < 0)
6087                 return err;
6088
6089         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6090         if (err < 0)
6091                 return err;
6092
6093         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6094                 return -EINVAL;
6095
6096         nft_set_ext_prepare(&tmpl);
6097
6098         if (flags != 0)
6099                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6100
6101         if (nla[NFTA_SET_ELEM_KEY]) {
6102                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6103                                             nla[NFTA_SET_ELEM_KEY]);
6104                 if (err < 0)
6105                         return err;
6106
6107                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6108         }
6109
6110         if (nla[NFTA_SET_ELEM_KEY_END]) {
6111                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6112                                             nla[NFTA_SET_ELEM_KEY_END]);
6113                 if (err < 0)
6114                         return err;
6115
6116                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6117         }
6118
6119         err = -ENOMEM;
6120         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6121                                       elem.key_end.val.data, NULL, 0, 0,
6122                                       GFP_KERNEL);
6123         if (elem.priv == NULL)
6124                 goto fail_elem;
6125
6126         ext = nft_set_elem_ext(set, elem.priv);
6127         if (flags)
6128                 *nft_set_ext_flags(ext) = flags;
6129
6130         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6131         if (trans == NULL)
6132                 goto fail_trans;
6133
6134         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6135         if (err < 0)
6136                 goto fail_ops;
6137
6138         nft_setelem_data_deactivate(ctx->net, set, &elem);
6139
6140         nft_trans_elem(trans) = elem;
6141         nft_trans_commit_list_add_tail(ctx->net, trans);
6142         return 0;
6143
6144 fail_ops:
6145         kfree(trans);
6146 fail_trans:
6147         kfree(elem.priv);
6148 fail_elem:
6149         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6150         return err;
6151 }
6152
6153 static int nft_setelem_flush(const struct nft_ctx *ctx,
6154                              struct nft_set *set,
6155                              const struct nft_set_iter *iter,
6156                              struct nft_set_elem *elem)
6157 {
6158         struct nft_trans *trans;
6159         int err;
6160
6161         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6162                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
6163         if (!trans)
6164                 return -ENOMEM;
6165
6166         if (!set->ops->flush(ctx->net, set, elem->priv)) {
6167                 err = -ENOENT;
6168                 goto err1;
6169         }
6170         set->ndeact++;
6171
6172         nft_setelem_data_deactivate(ctx->net, set, elem);
6173         nft_trans_elem_set(trans) = set;
6174         nft_trans_elem(trans) = *elem;
6175         nft_trans_commit_list_add_tail(ctx->net, trans);
6176
6177         return 0;
6178 err1:
6179         kfree(trans);
6180         return err;
6181 }
6182
6183 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6184                                     struct nft_set *set,
6185                                     struct nft_set_elem *elem)
6186 {
6187         struct nft_trans *trans;
6188
6189         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6190                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
6191         if (!trans)
6192                 return -ENOMEM;
6193
6194         nft_setelem_data_deactivate(ctx->net, set, elem);
6195         nft_trans_elem_set(trans) = set;
6196         nft_trans_elem(trans) = *elem;
6197         nft_trans_commit_list_add_tail(ctx->net, trans);
6198
6199         return 0;
6200 }
6201
6202 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6203                                   struct nft_set *set)
6204 {
6205         u8 genmask = nft_genmask_next(ctx->net);
6206         struct nft_set_elem_catchall *catchall;
6207         struct nft_set_elem elem;
6208         struct nft_set_ext *ext;
6209         int ret = 0;
6210
6211         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6212                 ext = nft_set_elem_ext(set, catchall->elem);
6213                 if (!nft_set_elem_active(ext, genmask) ||
6214                     nft_set_elem_mark_busy(ext))
6215                         continue;
6216
6217                 elem.priv = catchall->elem;
6218                 ret = __nft_set_catchall_flush(ctx, set, &elem);
6219                 if (ret < 0)
6220                         break;
6221         }
6222
6223         return ret;
6224 }
6225
6226 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6227 {
6228         struct nft_set_iter iter = {
6229                 .genmask        = genmask,
6230                 .fn             = nft_setelem_flush,
6231         };
6232
6233         set->ops->walk(ctx, set, &iter);
6234         if (!iter.err)
6235                 iter.err = nft_set_catchall_flush(ctx, set);
6236
6237         return iter.err;
6238 }
6239
6240 static int nf_tables_delsetelem(struct sk_buff *skb,
6241                                 const struct nfnl_info *info,
6242                                 const struct nlattr * const nla[])
6243 {
6244         struct netlink_ext_ack *extack = info->extack;
6245         u8 genmask = nft_genmask_next(info->net);
6246         struct net *net = info->net;
6247         const struct nlattr *attr;
6248         struct nft_set *set;
6249         struct nft_ctx ctx;
6250         int rem, err = 0;
6251
6252         err = nft_ctx_init_from_elemattr(&ctx, net, skb, info->nlh, nla, extack,
6253                                          genmask, NETLINK_CB(skb).portid);
6254         if (err < 0)
6255                 return err;
6256
6257         set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6258         if (IS_ERR(set))
6259                 return PTR_ERR(set);
6260         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6261                 return -EBUSY;
6262
6263         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6264                 return nft_set_flush(&ctx, set, genmask);
6265
6266         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6267                 err = nft_del_setelem(&ctx, set, attr);
6268                 if (err < 0)
6269                         break;
6270         }
6271         return err;
6272 }
6273
6274 void nft_set_gc_batch_release(struct rcu_head *rcu)
6275 {
6276         struct nft_set_gc_batch *gcb;
6277         unsigned int i;
6278
6279         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6280         for (i = 0; i < gcb->head.cnt; i++)
6281                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6282         kfree(gcb);
6283 }
6284
6285 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6286                                                 gfp_t gfp)
6287 {
6288         struct nft_set_gc_batch *gcb;
6289
6290         gcb = kzalloc(sizeof(*gcb), gfp);
6291         if (gcb == NULL)
6292                 return gcb;
6293         gcb->head.set = set;
6294         return gcb;
6295 }
6296
6297 /*
6298  * Stateful objects
6299  */
6300
6301 /**
6302  *      nft_register_obj- register nf_tables stateful object type
6303  *      @obj_type: object type
6304  *
6305  *      Registers the object type for use with nf_tables. Returns zero on
6306  *      success or a negative errno code otherwise.
6307  */
6308 int nft_register_obj(struct nft_object_type *obj_type)
6309 {
6310         if (obj_type->type == NFT_OBJECT_UNSPEC)
6311                 return -EINVAL;
6312
6313         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6314         list_add_rcu(&obj_type->list, &nf_tables_objects);
6315         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6316         return 0;
6317 }
6318 EXPORT_SYMBOL_GPL(nft_register_obj);
6319
6320 /**
6321  *      nft_unregister_obj - unregister nf_tables object type
6322  *      @obj_type: object type
6323  *
6324  *      Unregisters the object type for use with nf_tables.
6325  */
6326 void nft_unregister_obj(struct nft_object_type *obj_type)
6327 {
6328         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6329         list_del_rcu(&obj_type->list);
6330         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6331 }
6332 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6333
6334 struct nft_object *nft_obj_lookup(const struct net *net,
6335                                   const struct nft_table *table,
6336                                   const struct nlattr *nla, u32 objtype,
6337                                   u8 genmask)
6338 {
6339         struct nft_object_hash_key k = { .table = table };
6340         char search[NFT_OBJ_MAXNAMELEN];
6341         struct rhlist_head *tmp, *list;
6342         struct nft_object *obj;
6343
6344         nla_strscpy(search, nla, sizeof(search));
6345         k.name = search;
6346
6347         WARN_ON_ONCE(!rcu_read_lock_held() &&
6348                      !lockdep_commit_lock_is_held(net));
6349
6350         rcu_read_lock();
6351         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6352         if (!list)
6353                 goto out;
6354
6355         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6356                 if (objtype == obj->ops->type->type &&
6357                     nft_active_genmask(obj, genmask)) {
6358                         rcu_read_unlock();
6359                         return obj;
6360                 }
6361         }
6362 out:
6363         rcu_read_unlock();
6364         return ERR_PTR(-ENOENT);
6365 }
6366 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6367
6368 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6369                                                   const struct nlattr *nla,
6370                                                   u32 objtype, u8 genmask)
6371 {
6372         struct nft_object *obj;
6373
6374         list_for_each_entry(obj, &table->objects, list) {
6375                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6376                     objtype == obj->ops->type->type &&
6377                     nft_active_genmask(obj, genmask))
6378                         return obj;
6379         }
6380         return ERR_PTR(-ENOENT);
6381 }
6382
6383 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6384         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
6385                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
6386         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
6387                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
6388         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
6389         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
6390         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
6391         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
6392                                     .len = NFT_USERDATA_MAXLEN },
6393 };
6394
6395 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6396                                        const struct nft_object_type *type,
6397                                        const struct nlattr *attr)
6398 {
6399         struct nlattr **tb;
6400         const struct nft_object_ops *ops;
6401         struct nft_object *obj;
6402         int err = -ENOMEM;
6403
6404         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6405         if (!tb)
6406                 goto err1;
6407
6408         if (attr) {
6409                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6410                                                   type->policy, NULL);
6411                 if (err < 0)
6412                         goto err2;
6413         } else {
6414                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6415         }
6416
6417         if (type->select_ops) {
6418                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6419                 if (IS_ERR(ops)) {
6420                         err = PTR_ERR(ops);
6421                         goto err2;
6422                 }
6423         } else {
6424                 ops = type->ops;
6425         }
6426
6427         err = -ENOMEM;
6428         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
6429         if (!obj)
6430                 goto err2;
6431
6432         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6433         if (err < 0)
6434                 goto err3;
6435
6436         obj->ops = ops;
6437
6438         kfree(tb);
6439         return obj;
6440 err3:
6441         kfree(obj);
6442 err2:
6443         kfree(tb);
6444 err1:
6445         return ERR_PTR(err);
6446 }
6447
6448 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6449                            struct nft_object *obj, bool reset)
6450 {
6451         struct nlattr *nest;
6452
6453         nest = nla_nest_start_noflag(skb, attr);
6454         if (!nest)
6455                 goto nla_put_failure;
6456         if (obj->ops->dump(skb, obj, reset) < 0)
6457                 goto nla_put_failure;
6458         nla_nest_end(skb, nest);
6459         return 0;
6460
6461 nla_put_failure:
6462         return -1;
6463 }
6464
6465 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6466 {
6467         const struct nft_object_type *type;
6468
6469         list_for_each_entry(type, &nf_tables_objects, list) {
6470                 if (objtype == type->type)
6471                         return type;
6472         }
6473         return NULL;
6474 }
6475
6476 static const struct nft_object_type *
6477 nft_obj_type_get(struct net *net, u32 objtype)
6478 {
6479         const struct nft_object_type *type;
6480
6481         type = __nft_obj_type_get(objtype);
6482         if (type != NULL && try_module_get(type->owner))
6483                 return type;
6484
6485         lockdep_nfnl_nft_mutex_not_held();
6486 #ifdef CONFIG_MODULES
6487         if (type == NULL) {
6488                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6489                         return ERR_PTR(-EAGAIN);
6490         }
6491 #endif
6492         return ERR_PTR(-ENOENT);
6493 }
6494
6495 static int nf_tables_updobj(const struct nft_ctx *ctx,
6496                             const struct nft_object_type *type,
6497                             const struct nlattr *attr,
6498                             struct nft_object *obj)
6499 {
6500         struct nft_object *newobj;
6501         struct nft_trans *trans;
6502         int err;
6503
6504         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6505                                 sizeof(struct nft_trans_obj));
6506         if (!trans)
6507                 return -ENOMEM;
6508
6509         newobj = nft_obj_init(ctx, type, attr);
6510         if (IS_ERR(newobj)) {
6511                 err = PTR_ERR(newobj);
6512                 goto err_free_trans;
6513         }
6514
6515         nft_trans_obj(trans) = obj;
6516         nft_trans_obj_update(trans) = true;
6517         nft_trans_obj_newobj(trans) = newobj;
6518         nft_trans_commit_list_add_tail(ctx->net, trans);
6519
6520         return 0;
6521
6522 err_free_trans:
6523         kfree(trans);
6524         return err;
6525 }
6526
6527 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
6528                             const struct nlattr * const nla[])
6529 {
6530         const struct nfgenmsg *nfmsg = nlmsg_data(info->nlh);
6531         struct netlink_ext_ack *extack = info->extack;
6532         u8 genmask = nft_genmask_next(info->net);
6533         const struct nft_object_type *type;
6534         int family = nfmsg->nfgen_family;
6535         struct net *net = info->net;
6536         struct nft_table *table;
6537         struct nft_object *obj;
6538         struct nft_ctx ctx;
6539         u32 objtype;
6540         int err;
6541
6542         if (!nla[NFTA_OBJ_TYPE] ||
6543             !nla[NFTA_OBJ_NAME] ||
6544             !nla[NFTA_OBJ_DATA])
6545                 return -EINVAL;
6546
6547         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6548                                  NETLINK_CB(skb).portid);
6549         if (IS_ERR(table)) {
6550                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6551                 return PTR_ERR(table);
6552         }
6553
6554         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6555         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6556         if (IS_ERR(obj)) {
6557                 err = PTR_ERR(obj);
6558                 if (err != -ENOENT) {
6559                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6560                         return err;
6561                 }
6562         } else {
6563                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
6564                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6565                         return -EEXIST;
6566                 }
6567                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
6568                         return -EOPNOTSUPP;
6569
6570                 type = __nft_obj_type_get(objtype);
6571                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6572
6573                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6574         }
6575
6576         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6577
6578         type = nft_obj_type_get(net, objtype);
6579         if (IS_ERR(type))
6580                 return PTR_ERR(type);
6581
6582         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6583         if (IS_ERR(obj)) {
6584                 err = PTR_ERR(obj);
6585                 goto err_init;
6586         }
6587         obj->key.table = table;
6588         obj->handle = nf_tables_alloc_handle(table);
6589
6590         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
6591         if (!obj->key.name) {
6592                 err = -ENOMEM;
6593                 goto err_strdup;
6594         }
6595
6596         if (nla[NFTA_OBJ_USERDATA]) {
6597                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6598                 if (obj->udata == NULL)
6599                         goto err_userdata;
6600
6601                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6602         }
6603
6604         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6605         if (err < 0)
6606                 goto err_trans;
6607
6608         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6609                               nft_objname_ht_params);
6610         if (err < 0)
6611                 goto err_obj_ht;
6612
6613         list_add_tail_rcu(&obj->list, &table->objects);
6614         table->use++;
6615         return 0;
6616 err_obj_ht:
6617         /* queued in transaction log */
6618         INIT_LIST_HEAD(&obj->list);
6619         return err;
6620 err_trans:
6621         kfree(obj->udata);
6622 err_userdata:
6623         kfree(obj->key.name);
6624 err_strdup:
6625         if (obj->ops->destroy)
6626                 obj->ops->destroy(&ctx, obj);
6627         kfree(obj);
6628 err_init:
6629         module_put(type->owner);
6630         return err;
6631 }
6632
6633 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6634                                    u32 portid, u32 seq, int event, u32 flags,
6635                                    int family, const struct nft_table *table,
6636                                    struct nft_object *obj, bool reset)
6637 {
6638         struct nlmsghdr *nlh;
6639
6640         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6641         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
6642                            NFNETLINK_V0, nft_base_seq(net));
6643         if (!nlh)
6644                 goto nla_put_failure;
6645
6646         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6647             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6648             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6649             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6650             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6651             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6652                          NFTA_OBJ_PAD))
6653                 goto nla_put_failure;
6654
6655         if (obj->udata &&
6656             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6657                 goto nla_put_failure;
6658
6659         nlmsg_end(skb, nlh);
6660         return 0;
6661
6662 nla_put_failure:
6663         nlmsg_trim(skb, nlh);
6664         return -1;
6665 }
6666
6667 struct nft_obj_filter {
6668         char            *table;
6669         u32             type;
6670 };
6671
6672 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6673 {
6674         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6675         const struct nft_table *table;
6676         unsigned int idx = 0, s_idx = cb->args[0];
6677         struct nft_obj_filter *filter = cb->data;
6678         struct net *net = sock_net(skb->sk);
6679         int family = nfmsg->nfgen_family;
6680         struct nftables_pernet *nft_net;
6681         struct nft_object *obj;
6682         bool reset = false;
6683
6684         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6685                 reset = true;
6686
6687         rcu_read_lock();
6688         nft_net = nft_pernet(net);
6689         cb->seq = nft_net->base_seq;
6690
6691         list_for_each_entry_rcu(table, &nft_net->tables, list) {
6692                 if (family != NFPROTO_UNSPEC && family != table->family)
6693                         continue;
6694
6695                 list_for_each_entry_rcu(obj, &table->objects, list) {
6696                         if (!nft_is_active(net, obj))
6697                                 goto cont;
6698                         if (idx < s_idx)
6699                                 goto cont;
6700                         if (idx > s_idx)
6701                                 memset(&cb->args[1], 0,
6702                                        sizeof(cb->args) - sizeof(cb->args[0]));
6703                         if (filter && filter->table &&
6704                             strcmp(filter->table, table->name))
6705                                 goto cont;
6706                         if (filter &&
6707                             filter->type != NFT_OBJECT_UNSPEC &&
6708                             obj->ops->type->type != filter->type)
6709                                 goto cont;
6710                         if (reset) {
6711                                 char *buf = kasprintf(GFP_ATOMIC,
6712                                                       "%s:%u",
6713                                                       table->name,
6714                                                       nft_net->base_seq);
6715
6716                                 audit_log_nfcfg(buf,
6717                                                 family,
6718                                                 obj->handle,
6719                                                 AUDIT_NFT_OP_OBJ_RESET,
6720                                                 GFP_ATOMIC);
6721                                 kfree(buf);
6722                         }
6723
6724                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6725                                                     cb->nlh->nlmsg_seq,
6726                                                     NFT_MSG_NEWOBJ,
6727                                                     NLM_F_MULTI | NLM_F_APPEND,
6728                                                     table->family, table,
6729                                                     obj, reset) < 0)
6730                                 goto done;
6731
6732                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6733 cont:
6734                         idx++;
6735                 }
6736         }
6737 done:
6738         rcu_read_unlock();
6739
6740         cb->args[0] = idx;
6741         return skb->len;
6742 }
6743
6744 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6745 {
6746         const struct nlattr * const *nla = cb->data;
6747         struct nft_obj_filter *filter = NULL;
6748
6749         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6750                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6751                 if (!filter)
6752                         return -ENOMEM;
6753
6754                 if (nla[NFTA_OBJ_TABLE]) {
6755                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6756                         if (!filter->table) {
6757                                 kfree(filter);
6758                                 return -ENOMEM;
6759                         }
6760                 }
6761
6762                 if (nla[NFTA_OBJ_TYPE])
6763                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6764         }
6765
6766         cb->data = filter;
6767         return 0;
6768 }
6769
6770 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6771 {
6772         struct nft_obj_filter *filter = cb->data;
6773
6774         if (filter) {
6775                 kfree(filter->table);
6776                 kfree(filter);
6777         }
6778
6779         return 0;
6780 }
6781
6782 /* called with rcu_read_lock held */
6783 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
6784                             const struct nlattr * const nla[])
6785 {
6786         const struct nfgenmsg *nfmsg = nlmsg_data(info->nlh);
6787         struct netlink_ext_ack *extack = info->extack;
6788         u8 genmask = nft_genmask_cur(info->net);
6789         int family = nfmsg->nfgen_family;
6790         const struct nft_table *table;
6791         struct net *net = info->net;
6792         struct nft_object *obj;
6793         struct sk_buff *skb2;
6794         bool reset = false;
6795         u32 objtype;
6796         int err;
6797
6798         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6799                 struct netlink_dump_control c = {
6800                         .start = nf_tables_dump_obj_start,
6801                         .dump = nf_tables_dump_obj,
6802                         .done = nf_tables_dump_obj_done,
6803                         .module = THIS_MODULE,
6804                         .data = (void *)nla,
6805                 };
6806
6807                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6808         }
6809
6810         if (!nla[NFTA_OBJ_NAME] ||
6811             !nla[NFTA_OBJ_TYPE])
6812                 return -EINVAL;
6813
6814         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
6815         if (IS_ERR(table)) {
6816                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6817                 return PTR_ERR(table);
6818         }
6819
6820         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6821         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6822         if (IS_ERR(obj)) {
6823                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6824                 return PTR_ERR(obj);
6825         }
6826
6827         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6828         if (!skb2)
6829                 return -ENOMEM;
6830
6831         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6832                 reset = true;
6833
6834         if (reset) {
6835                 const struct nftables_pernet *nft_net;
6836                 char *buf;
6837
6838                 nft_net = nft_pernet(net);
6839                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
6840
6841                 audit_log_nfcfg(buf,
6842                                 family,
6843                                 obj->handle,
6844                                 AUDIT_NFT_OP_OBJ_RESET,
6845                                 GFP_ATOMIC);
6846                 kfree(buf);
6847         }
6848
6849         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6850                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
6851                                       family, table, obj, reset);
6852         if (err < 0)
6853                 goto err_fill_obj_info;
6854
6855         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6856
6857 err_fill_obj_info:
6858         kfree_skb(skb2);
6859         return err;
6860 }
6861
6862 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
6863 {
6864         if (obj->ops->destroy)
6865                 obj->ops->destroy(ctx, obj);
6866
6867         module_put(obj->ops->type->owner);
6868         kfree(obj->key.name);
6869         kfree(obj->udata);
6870         kfree(obj);
6871 }
6872
6873 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
6874                             const struct nlattr * const nla[])
6875 {
6876         const struct nfgenmsg *nfmsg = nlmsg_data(info->nlh);
6877         struct netlink_ext_ack *extack = info->extack;
6878         u8 genmask = nft_genmask_next(info->net);
6879         int family = nfmsg->nfgen_family;
6880         struct net *net = info->net;
6881         const struct nlattr *attr;
6882         struct nft_table *table;
6883         struct nft_object *obj;
6884         struct nft_ctx ctx;
6885         u32 objtype;
6886
6887         if (!nla[NFTA_OBJ_TYPE] ||
6888             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
6889                 return -EINVAL;
6890
6891         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6892                                  NETLINK_CB(skb).portid);
6893         if (IS_ERR(table)) {
6894                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6895                 return PTR_ERR(table);
6896         }
6897
6898         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6899         if (nla[NFTA_OBJ_HANDLE]) {
6900                 attr = nla[NFTA_OBJ_HANDLE];
6901                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
6902         } else {
6903                 attr = nla[NFTA_OBJ_NAME];
6904                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
6905         }
6906
6907         if (IS_ERR(obj)) {
6908                 NL_SET_BAD_ATTR(extack, attr);
6909                 return PTR_ERR(obj);
6910         }
6911         if (obj->use > 0) {
6912                 NL_SET_BAD_ATTR(extack, attr);
6913                 return -EBUSY;
6914         }
6915
6916         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6917
6918         return nft_delobj(&ctx, obj);
6919 }
6920
6921 void nft_obj_notify(struct net *net, const struct nft_table *table,
6922                     struct nft_object *obj, u32 portid, u32 seq, int event,
6923                     int family, int report, gfp_t gfp)
6924 {
6925         struct nftables_pernet *nft_net = nft_pernet(net);
6926         struct sk_buff *skb;
6927         int err;
6928         char *buf = kasprintf(gfp, "%s:%u",
6929                               table->name, nft_net->base_seq);
6930
6931         audit_log_nfcfg(buf,
6932                         family,
6933                         obj->handle,
6934                         event == NFT_MSG_NEWOBJ ?
6935                                  AUDIT_NFT_OP_OBJ_REGISTER :
6936                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
6937                         gfp);
6938         kfree(buf);
6939
6940         if (!report &&
6941             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6942                 return;
6943
6944         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
6945         if (skb == NULL)
6946                 goto err;
6947
6948         err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
6949                                       table, obj, false);
6950         if (err < 0) {
6951                 kfree_skb(skb);
6952                 goto err;
6953         }
6954
6955         nft_notify_enqueue(skb, report, &nft_net->notify_list);
6956         return;
6957 err:
6958         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6959 }
6960 EXPORT_SYMBOL_GPL(nft_obj_notify);
6961
6962 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
6963                                  struct nft_object *obj, int event)
6964 {
6965         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
6966                        ctx->family, ctx->report, GFP_KERNEL);
6967 }
6968
6969 /*
6970  * Flow tables
6971  */
6972 void nft_register_flowtable_type(struct nf_flowtable_type *type)
6973 {
6974         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6975         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
6976         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6977 }
6978 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
6979
6980 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
6981 {
6982         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6983         list_del_rcu(&type->list);
6984         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6985 }
6986 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
6987
6988 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
6989         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
6990                                             .len = NFT_NAME_MAXLEN - 1 },
6991         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
6992                                             .len = NFT_NAME_MAXLEN - 1 },
6993         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
6994         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
6995         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
6996 };
6997
6998 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
6999                                            const struct nlattr *nla, u8 genmask)
7000 {
7001         struct nft_flowtable *flowtable;
7002
7003         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7004                 if (!nla_strcmp(nla, flowtable->name) &&
7005                     nft_active_genmask(flowtable, genmask))
7006                         return flowtable;
7007         }
7008         return ERR_PTR(-ENOENT);
7009 }
7010 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7011
7012 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7013                                     struct nft_flowtable *flowtable,
7014                                     enum nft_trans_phase phase)
7015 {
7016         switch (phase) {
7017         case NFT_TRANS_PREPARE:
7018         case NFT_TRANS_ABORT:
7019         case NFT_TRANS_RELEASE:
7020                 flowtable->use--;
7021                 fallthrough;
7022         default:
7023                 return;
7024         }
7025 }
7026 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7027
7028 static struct nft_flowtable *
7029 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7030                               const struct nlattr *nla, u8 genmask)
7031 {
7032        struct nft_flowtable *flowtable;
7033
7034        list_for_each_entry(flowtable, &table->flowtables, list) {
7035                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7036                    nft_active_genmask(flowtable, genmask))
7037                        return flowtable;
7038        }
7039        return ERR_PTR(-ENOENT);
7040 }
7041
7042 struct nft_flowtable_hook {
7043         u32                     num;
7044         int                     priority;
7045         struct list_head        list;
7046 };
7047
7048 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7049         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
7050         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
7051         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
7052 };
7053
7054 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7055                                     const struct nlattr *attr,
7056                                     struct nft_flowtable_hook *flowtable_hook,
7057                                     struct nft_flowtable *flowtable, bool add)
7058 {
7059         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7060         struct nft_hook *hook;
7061         int hooknum, priority;
7062         int err;
7063
7064         INIT_LIST_HEAD(&flowtable_hook->list);
7065
7066         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7067                                           nft_flowtable_hook_policy, NULL);
7068         if (err < 0)
7069                 return err;
7070
7071         if (add) {
7072                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7073                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7074                         return -EINVAL;
7075
7076                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7077                 if (hooknum != NF_NETDEV_INGRESS)
7078                         return -EOPNOTSUPP;
7079
7080                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7081
7082                 flowtable_hook->priority        = priority;
7083                 flowtable_hook->num             = hooknum;
7084         } else {
7085                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7086                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7087                         if (hooknum != flowtable->hooknum)
7088                                 return -EOPNOTSUPP;
7089                 }
7090
7091                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7092                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7093                         if (priority != flowtable->data.priority)
7094                                 return -EOPNOTSUPP;
7095                 }
7096
7097                 flowtable_hook->priority        = flowtable->data.priority;
7098                 flowtable_hook->num             = flowtable->hooknum;
7099         }
7100
7101         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7102                 err = nf_tables_parse_netdev_hooks(ctx->net,
7103                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
7104                                                    &flowtable_hook->list);
7105                 if (err < 0)
7106                         return err;
7107         }
7108
7109         list_for_each_entry(hook, &flowtable_hook->list, list) {
7110                 hook->ops.pf            = NFPROTO_NETDEV;
7111                 hook->ops.hooknum       = flowtable_hook->num;
7112                 hook->ops.priority      = flowtable_hook->priority;
7113                 hook->ops.priv          = &flowtable->data;
7114                 hook->ops.hook          = flowtable->data.type->hook;
7115         }
7116
7117         return err;
7118 }
7119
7120 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7121 {
7122         const struct nf_flowtable_type *type;
7123
7124         list_for_each_entry(type, &nf_tables_flowtables, list) {
7125                 if (family == type->family)
7126                         return type;
7127         }
7128         return NULL;
7129 }
7130
7131 static const struct nf_flowtable_type *
7132 nft_flowtable_type_get(struct net *net, u8 family)
7133 {
7134         const struct nf_flowtable_type *type;
7135
7136         type = __nft_flowtable_type_get(family);
7137         if (type != NULL && try_module_get(type->owner))
7138                 return type;
7139
7140         lockdep_nfnl_nft_mutex_not_held();
7141 #ifdef CONFIG_MODULES
7142         if (type == NULL) {
7143                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7144                         return ERR_PTR(-EAGAIN);
7145         }
7146 #endif
7147         return ERR_PTR(-ENOENT);
7148 }
7149
7150 /* Only called from error and netdev event paths. */
7151 static void nft_unregister_flowtable_hook(struct net *net,
7152                                           struct nft_flowtable *flowtable,
7153                                           struct nft_hook *hook)
7154 {
7155         nf_unregister_net_hook(net, &hook->ops);
7156         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7157                                     FLOW_BLOCK_UNBIND);
7158 }
7159
7160 static void nft_unregister_flowtable_net_hooks(struct net *net,
7161                                                struct list_head *hook_list)
7162 {
7163         struct nft_hook *hook;
7164
7165         list_for_each_entry(hook, hook_list, list)
7166                 nf_unregister_net_hook(net, &hook->ops);
7167 }
7168
7169 static int nft_register_flowtable_net_hooks(struct net *net,
7170                                             struct nft_table *table,
7171                                             struct list_head *hook_list,
7172                                             struct nft_flowtable *flowtable)
7173 {
7174         struct nft_hook *hook, *hook2, *next;
7175         struct nft_flowtable *ft;
7176         int err, i = 0;
7177
7178         list_for_each_entry(hook, hook_list, list) {
7179                 list_for_each_entry(ft, &table->flowtables, list) {
7180                         if (!nft_is_active_next(net, ft))
7181                                 continue;
7182
7183                         list_for_each_entry(hook2, &ft->hook_list, list) {
7184                                 if (hook->ops.dev == hook2->ops.dev &&
7185                                     hook->ops.pf == hook2->ops.pf) {
7186                                         err = -EEXIST;
7187                                         goto err_unregister_net_hooks;
7188                                 }
7189                         }
7190                 }
7191
7192                 err = flowtable->data.type->setup(&flowtable->data,
7193                                                   hook->ops.dev,
7194                                                   FLOW_BLOCK_BIND);
7195                 if (err < 0)
7196                         goto err_unregister_net_hooks;
7197
7198                 err = nf_register_net_hook(net, &hook->ops);
7199                 if (err < 0) {
7200                         flowtable->data.type->setup(&flowtable->data,
7201                                                     hook->ops.dev,
7202                                                     FLOW_BLOCK_UNBIND);
7203                         goto err_unregister_net_hooks;
7204                 }
7205
7206                 i++;
7207         }
7208
7209         return 0;
7210
7211 err_unregister_net_hooks:
7212         list_for_each_entry_safe(hook, next, hook_list, list) {
7213                 if (i-- <= 0)
7214                         break;
7215
7216                 nft_unregister_flowtable_hook(net, flowtable, hook);
7217                 list_del_rcu(&hook->list);
7218                 kfree_rcu(hook, rcu);
7219         }
7220
7221         return err;
7222 }
7223
7224 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7225 {
7226         struct nft_hook *hook, *next;
7227
7228         list_for_each_entry_safe(hook, next, hook_list, list) {
7229                 list_del_rcu(&hook->list);
7230                 kfree_rcu(hook, rcu);
7231         }
7232 }
7233
7234 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7235                                 struct nft_flowtable *flowtable)
7236 {
7237         const struct nlattr * const *nla = ctx->nla;
7238         struct nft_flowtable_hook flowtable_hook;
7239         struct nft_hook *hook, *next;
7240         struct nft_trans *trans;
7241         bool unregister = false;
7242         u32 flags;
7243         int err;
7244
7245         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7246                                        &flowtable_hook, flowtable, false);
7247         if (err < 0)
7248                 return err;
7249
7250         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7251                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7252                         list_del(&hook->list);
7253                         kfree(hook);
7254                 }
7255         }
7256
7257         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7258                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7259                 if (flags & ~NFT_FLOWTABLE_MASK)
7260                         return -EOPNOTSUPP;
7261                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7262                     (flags & NFT_FLOWTABLE_HW_OFFLOAD))
7263                         return -EOPNOTSUPP;
7264         } else {
7265                 flags = flowtable->data.flags;
7266         }
7267
7268         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7269                                                &flowtable_hook.list, flowtable);
7270         if (err < 0)
7271                 goto err_flowtable_update_hook;
7272
7273         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7274                                 sizeof(struct nft_trans_flowtable));
7275         if (!trans) {
7276                 unregister = true;
7277                 err = -ENOMEM;
7278                 goto err_flowtable_update_hook;
7279         }
7280
7281         nft_trans_flowtable_flags(trans) = flags;
7282         nft_trans_flowtable(trans) = flowtable;
7283         nft_trans_flowtable_update(trans) = true;
7284         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7285         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7286
7287         nft_trans_commit_list_add_tail(ctx->net, trans);
7288
7289         return 0;
7290
7291 err_flowtable_update_hook:
7292         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7293                 if (unregister)
7294                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7295                 list_del_rcu(&hook->list);
7296                 kfree_rcu(hook, rcu);
7297         }
7298
7299         return err;
7300
7301 }
7302
7303 static int nf_tables_newflowtable(struct sk_buff *skb,
7304                                   const struct nfnl_info *info,
7305                                   const struct nlattr * const nla[])
7306 {
7307         const struct nfgenmsg *nfmsg = nlmsg_data(info->nlh);
7308         struct netlink_ext_ack *extack = info->extack;
7309         struct nft_flowtable_hook flowtable_hook;
7310         u8 genmask = nft_genmask_next(info->net);
7311         const struct nf_flowtable_type *type;
7312         int family = nfmsg->nfgen_family;
7313         struct nft_flowtable *flowtable;
7314         struct nft_hook *hook, *next;
7315         struct net *net = info->net;
7316         struct nft_table *table;
7317         struct nft_ctx ctx;
7318         int err;
7319
7320         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7321             !nla[NFTA_FLOWTABLE_NAME] ||
7322             !nla[NFTA_FLOWTABLE_HOOK])
7323                 return -EINVAL;
7324
7325         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7326                                  genmask, NETLINK_CB(skb).portid);
7327         if (IS_ERR(table)) {
7328                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7329                 return PTR_ERR(table);
7330         }
7331
7332         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7333                                          genmask);
7334         if (IS_ERR(flowtable)) {
7335                 err = PTR_ERR(flowtable);
7336                 if (err != -ENOENT) {
7337                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7338                         return err;
7339                 }
7340         } else {
7341                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7342                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7343                         return -EEXIST;
7344                 }
7345
7346                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7347
7348                 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7349         }
7350
7351         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7352
7353         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
7354         if (!flowtable)
7355                 return -ENOMEM;
7356
7357         flowtable->table = table;
7358         flowtable->handle = nf_tables_alloc_handle(table);
7359         INIT_LIST_HEAD(&flowtable->hook_list);
7360
7361         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
7362         if (!flowtable->name) {
7363                 err = -ENOMEM;
7364                 goto err1;
7365         }
7366
7367         type = nft_flowtable_type_get(net, family);
7368         if (IS_ERR(type)) {
7369                 err = PTR_ERR(type);
7370                 goto err2;
7371         }
7372
7373         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7374                 flowtable->data.flags =
7375                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7376                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7377                         err = -EOPNOTSUPP;
7378                         goto err3;
7379                 }
7380         }
7381
7382         write_pnet(&flowtable->data.net, net);
7383         flowtable->data.type = type;
7384         err = type->init(&flowtable->data);
7385         if (err < 0)
7386                 goto err3;
7387
7388         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7389                                        &flowtable_hook, flowtable, true);
7390         if (err < 0)
7391                 goto err4;
7392
7393         list_splice(&flowtable_hook.list, &flowtable->hook_list);
7394         flowtable->data.priority = flowtable_hook.priority;
7395         flowtable->hooknum = flowtable_hook.num;
7396
7397         err = nft_register_flowtable_net_hooks(ctx.net, table,
7398                                                &flowtable->hook_list,
7399                                                flowtable);
7400         if (err < 0) {
7401                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7402                 goto err4;
7403         }
7404
7405         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7406         if (err < 0)
7407                 goto err5;
7408
7409         list_add_tail_rcu(&flowtable->list, &table->flowtables);
7410         table->use++;
7411
7412         return 0;
7413 err5:
7414         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7415                 nft_unregister_flowtable_hook(net, flowtable, hook);
7416                 list_del_rcu(&hook->list);
7417                 kfree_rcu(hook, rcu);
7418         }
7419 err4:
7420         flowtable->data.type->free(&flowtable->data);
7421 err3:
7422         module_put(type->owner);
7423 err2:
7424         kfree(flowtable->name);
7425 err1:
7426         kfree(flowtable);
7427         return err;
7428 }
7429
7430 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7431 {
7432         struct nft_hook *this, *next;
7433
7434         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7435                 list_del(&this->list);
7436                 kfree(this);
7437         }
7438 }
7439
7440 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7441                                  struct nft_flowtable *flowtable)
7442 {
7443         const struct nlattr * const *nla = ctx->nla;
7444         struct nft_flowtable_hook flowtable_hook;
7445         struct nft_hook *this, *hook;
7446         struct nft_trans *trans;
7447         int err;
7448
7449         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7450                                        &flowtable_hook, flowtable, false);
7451         if (err < 0)
7452                 return err;
7453
7454         list_for_each_entry(this, &flowtable_hook.list, list) {
7455                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7456                 if (!hook) {
7457                         err = -ENOENT;
7458                         goto err_flowtable_del_hook;
7459                 }
7460                 hook->inactive = true;
7461         }
7462
7463         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7464                                 sizeof(struct nft_trans_flowtable));
7465         if (!trans) {
7466                 err = -ENOMEM;
7467                 goto err_flowtable_del_hook;
7468         }
7469
7470         nft_trans_flowtable(trans) = flowtable;
7471         nft_trans_flowtable_update(trans) = true;
7472         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7473         nft_flowtable_hook_release(&flowtable_hook);
7474
7475         nft_trans_commit_list_add_tail(ctx->net, trans);
7476
7477         return 0;
7478
7479 err_flowtable_del_hook:
7480         list_for_each_entry(this, &flowtable_hook.list, list) {
7481                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7482                 if (!hook)
7483                         break;
7484
7485                 hook->inactive = false;
7486         }
7487         nft_flowtable_hook_release(&flowtable_hook);
7488
7489         return err;
7490 }
7491
7492 static int nf_tables_delflowtable(struct sk_buff *skb,
7493                                   const struct nfnl_info *info,
7494                                   const struct nlattr * const nla[])
7495 {
7496         const struct nfgenmsg *nfmsg = nlmsg_data(info->nlh);
7497         struct netlink_ext_ack *extack = info->extack;
7498         u8 genmask = nft_genmask_next(info->net);
7499         int family = nfmsg->nfgen_family;
7500         struct nft_flowtable *flowtable;
7501         struct net *net = info->net;
7502         const struct nlattr *attr;
7503         struct nft_table *table;
7504         struct nft_ctx ctx;
7505
7506         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7507             (!nla[NFTA_FLOWTABLE_NAME] &&
7508              !nla[NFTA_FLOWTABLE_HANDLE]))
7509                 return -EINVAL;
7510
7511         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7512                                  genmask, NETLINK_CB(skb).portid);
7513         if (IS_ERR(table)) {
7514                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7515                 return PTR_ERR(table);
7516         }
7517
7518         if (nla[NFTA_FLOWTABLE_HANDLE]) {
7519                 attr = nla[NFTA_FLOWTABLE_HANDLE];
7520                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7521         } else {
7522                 attr = nla[NFTA_FLOWTABLE_NAME];
7523                 flowtable = nft_flowtable_lookup(table, attr, genmask);
7524         }
7525
7526         if (IS_ERR(flowtable)) {
7527                 NL_SET_BAD_ATTR(extack, attr);
7528                 return PTR_ERR(flowtable);
7529         }
7530
7531         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7532
7533         if (nla[NFTA_FLOWTABLE_HOOK])
7534                 return nft_delflowtable_hook(&ctx, flowtable);
7535
7536         if (flowtable->use > 0) {
7537                 NL_SET_BAD_ATTR(extack, attr);
7538                 return -EBUSY;
7539         }
7540
7541         return nft_delflowtable(&ctx, flowtable);
7542 }
7543
7544 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7545                                          u32 portid, u32 seq, int event,
7546                                          u32 flags, int family,
7547                                          struct nft_flowtable *flowtable,
7548                                          struct list_head *hook_list)
7549 {
7550         struct nlattr *nest, *nest_devs;
7551         struct nft_hook *hook;
7552         struct nlmsghdr *nlh;
7553
7554         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7555         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7556                            NFNETLINK_V0, nft_base_seq(net));
7557         if (!nlh)
7558                 goto nla_put_failure;
7559
7560         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7561             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7562             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7563             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7564                          NFTA_FLOWTABLE_PAD) ||
7565             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7566                 goto nla_put_failure;
7567
7568         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7569         if (!nest)
7570                 goto nla_put_failure;
7571         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7572             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7573                 goto nla_put_failure;
7574
7575         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7576         if (!nest_devs)
7577                 goto nla_put_failure;
7578
7579         list_for_each_entry_rcu(hook, hook_list, list) {
7580                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7581                         goto nla_put_failure;
7582         }
7583         nla_nest_end(skb, nest_devs);
7584         nla_nest_end(skb, nest);
7585
7586         nlmsg_end(skb, nlh);
7587         return 0;
7588
7589 nla_put_failure:
7590         nlmsg_trim(skb, nlh);
7591         return -1;
7592 }
7593
7594 struct nft_flowtable_filter {
7595         char            *table;
7596 };
7597
7598 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7599                                     struct netlink_callback *cb)
7600 {
7601         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7602         struct nft_flowtable_filter *filter = cb->data;
7603         unsigned int idx = 0, s_idx = cb->args[0];
7604         struct net *net = sock_net(skb->sk);
7605         int family = nfmsg->nfgen_family;
7606         struct nft_flowtable *flowtable;
7607         struct nftables_pernet *nft_net;
7608         const struct nft_table *table;
7609
7610         rcu_read_lock();
7611         nft_net = nft_pernet(net);
7612         cb->seq = nft_net->base_seq;
7613
7614         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7615                 if (family != NFPROTO_UNSPEC && family != table->family)
7616                         continue;
7617
7618                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7619                         if (!nft_is_active(net, flowtable))
7620                                 goto cont;
7621                         if (idx < s_idx)
7622                                 goto cont;
7623                         if (idx > s_idx)
7624                                 memset(&cb->args[1], 0,
7625                                        sizeof(cb->args) - sizeof(cb->args[0]));
7626                         if (filter && filter->table &&
7627                             strcmp(filter->table, table->name))
7628                                 goto cont;
7629
7630                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7631                                                           cb->nlh->nlmsg_seq,
7632                                                           NFT_MSG_NEWFLOWTABLE,
7633                                                           NLM_F_MULTI | NLM_F_APPEND,
7634                                                           table->family,
7635                                                           flowtable,
7636                                                           &flowtable->hook_list) < 0)
7637                                 goto done;
7638
7639                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7640 cont:
7641                         idx++;
7642                 }
7643         }
7644 done:
7645         rcu_read_unlock();
7646
7647         cb->args[0] = idx;
7648         return skb->len;
7649 }
7650
7651 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7652 {
7653         const struct nlattr * const *nla = cb->data;
7654         struct nft_flowtable_filter *filter = NULL;
7655
7656         if (nla[NFTA_FLOWTABLE_TABLE]) {
7657                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7658                 if (!filter)
7659                         return -ENOMEM;
7660
7661                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7662                                            GFP_ATOMIC);
7663                 if (!filter->table) {
7664                         kfree(filter);
7665                         return -ENOMEM;
7666                 }
7667         }
7668
7669         cb->data = filter;
7670         return 0;
7671 }
7672
7673 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7674 {
7675         struct nft_flowtable_filter *filter = cb->data;
7676
7677         if (!filter)
7678                 return 0;
7679
7680         kfree(filter->table);
7681         kfree(filter);
7682
7683         return 0;
7684 }
7685
7686 /* called with rcu_read_lock held */
7687 static int nf_tables_getflowtable(struct sk_buff *skb,
7688                                   const struct nfnl_info *info,
7689                                   const struct nlattr * const nla[])
7690 {
7691         const struct nfgenmsg *nfmsg = nlmsg_data(info->nlh);
7692         u8 genmask = nft_genmask_cur(info->net);
7693         int family = nfmsg->nfgen_family;
7694         struct nft_flowtable *flowtable;
7695         const struct nft_table *table;
7696         struct net *net = info->net;
7697         struct sk_buff *skb2;
7698         int err;
7699
7700         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7701                 struct netlink_dump_control c = {
7702                         .start = nf_tables_dump_flowtable_start,
7703                         .dump = nf_tables_dump_flowtable,
7704                         .done = nf_tables_dump_flowtable_done,
7705                         .module = THIS_MODULE,
7706                         .data = (void *)nla,
7707                 };
7708
7709                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7710         }
7711
7712         if (!nla[NFTA_FLOWTABLE_NAME])
7713                 return -EINVAL;
7714
7715         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7716                                  genmask, 0);
7717         if (IS_ERR(table))
7718                 return PTR_ERR(table);
7719
7720         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7721                                          genmask);
7722         if (IS_ERR(flowtable))
7723                 return PTR_ERR(flowtable);
7724
7725         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7726         if (!skb2)
7727                 return -ENOMEM;
7728
7729         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7730                                             info->nlh->nlmsg_seq,
7731                                             NFT_MSG_NEWFLOWTABLE, 0, family,
7732                                             flowtable, &flowtable->hook_list);
7733         if (err < 0)
7734                 goto err_fill_flowtable_info;
7735
7736         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7737
7738 err_fill_flowtable_info:
7739         kfree_skb(skb2);
7740         return err;
7741 }
7742
7743 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7744                                        struct nft_flowtable *flowtable,
7745                                        struct list_head *hook_list,
7746                                        int event)
7747 {
7748         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
7749         struct sk_buff *skb;
7750         int err;
7751
7752         if (!ctx->report &&
7753             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7754                 return;
7755
7756         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7757         if (skb == NULL)
7758                 goto err;
7759
7760         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7761                                             ctx->seq, event, 0,
7762                                             ctx->family, flowtable, hook_list);
7763         if (err < 0) {
7764                 kfree_skb(skb);
7765                 goto err;
7766         }
7767
7768         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
7769         return;
7770 err:
7771         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7772 }
7773
7774 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7775 {
7776         struct nft_hook *hook, *next;
7777
7778         flowtable->data.type->free(&flowtable->data);
7779         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7780                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7781                                             FLOW_BLOCK_UNBIND);
7782                 list_del_rcu(&hook->list);
7783                 kfree(hook);
7784         }
7785         kfree(flowtable->name);
7786         module_put(flowtable->data.type->owner);
7787         kfree(flowtable);
7788 }
7789
7790 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7791                                    u32 portid, u32 seq)
7792 {
7793         struct nftables_pernet *nft_net = nft_pernet(net);
7794         struct nlmsghdr *nlh;
7795         char buf[TASK_COMM_LEN];
7796         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7797
7798         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
7799                            NFNETLINK_V0, nft_base_seq(net));
7800         if (!nlh)
7801                 goto nla_put_failure;
7802
7803         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
7804             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7805             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7806                 goto nla_put_failure;
7807
7808         nlmsg_end(skb, nlh);
7809         return 0;
7810
7811 nla_put_failure:
7812         nlmsg_trim(skb, nlh);
7813         return -EMSGSIZE;
7814 }
7815
7816 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7817                                 struct nft_flowtable *flowtable)
7818 {
7819         struct nft_hook *hook;
7820
7821         list_for_each_entry(hook, &flowtable->hook_list, list) {
7822                 if (hook->ops.dev != dev)
7823                         continue;
7824
7825                 /* flow_offload_netdev_event() cleans up entries for us. */
7826                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
7827                 list_del_rcu(&hook->list);
7828                 kfree_rcu(hook, rcu);
7829                 break;
7830         }
7831 }
7832
7833 static int nf_tables_flowtable_event(struct notifier_block *this,
7834                                      unsigned long event, void *ptr)
7835 {
7836         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7837         struct nft_flowtable *flowtable;
7838         struct nftables_pernet *nft_net;
7839         struct nft_table *table;
7840         struct net *net;
7841
7842         if (event != NETDEV_UNREGISTER)
7843                 return 0;
7844
7845         net = dev_net(dev);
7846         nft_net = nft_pernet(net);
7847         mutex_lock(&nft_net->commit_mutex);
7848         list_for_each_entry(table, &nft_net->tables, list) {
7849                 list_for_each_entry(flowtable, &table->flowtables, list) {
7850                         nft_flowtable_event(event, dev, flowtable);
7851                 }
7852         }
7853         mutex_unlock(&nft_net->commit_mutex);
7854
7855         return NOTIFY_DONE;
7856 }
7857
7858 static struct notifier_block nf_tables_flowtable_notifier = {
7859         .notifier_call  = nf_tables_flowtable_event,
7860 };
7861
7862 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
7863                                  int event)
7864 {
7865         struct nlmsghdr *nlh = nlmsg_hdr(skb);
7866         struct sk_buff *skb2;
7867         int err;
7868
7869         if (!nlmsg_report(nlh) &&
7870             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7871                 return;
7872
7873         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7874         if (skb2 == NULL)
7875                 goto err;
7876
7877         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7878                                       nlh->nlmsg_seq);
7879         if (err < 0) {
7880                 kfree_skb(skb2);
7881                 goto err;
7882         }
7883
7884         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7885                        nlmsg_report(nlh), GFP_KERNEL);
7886         return;
7887 err:
7888         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7889                           -ENOBUFS);
7890 }
7891
7892 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
7893                             const struct nlattr * const nla[])
7894 {
7895         struct sk_buff *skb2;
7896         int err;
7897
7898         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7899         if (skb2 == NULL)
7900                 return -ENOMEM;
7901
7902         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
7903                                       info->nlh->nlmsg_seq);
7904         if (err < 0)
7905                 goto err_fill_gen_info;
7906
7907         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
7908
7909 err_fill_gen_info:
7910         kfree_skb(skb2);
7911         return err;
7912 }
7913
7914 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
7915         [NFT_MSG_NEWTABLE] = {
7916                 .call           = nf_tables_newtable,
7917                 .type           = NFNL_CB_BATCH,
7918                 .attr_count     = NFTA_TABLE_MAX,
7919                 .policy         = nft_table_policy,
7920         },
7921         [NFT_MSG_GETTABLE] = {
7922                 .call           = nf_tables_gettable,
7923                 .type           = NFNL_CB_RCU,
7924                 .attr_count     = NFTA_TABLE_MAX,
7925                 .policy         = nft_table_policy,
7926         },
7927         [NFT_MSG_DELTABLE] = {
7928                 .call           = nf_tables_deltable,
7929                 .type           = NFNL_CB_BATCH,
7930                 .attr_count     = NFTA_TABLE_MAX,
7931                 .policy         = nft_table_policy,
7932         },
7933         [NFT_MSG_NEWCHAIN] = {
7934                 .call           = nf_tables_newchain,
7935                 .type           = NFNL_CB_BATCH,
7936                 .attr_count     = NFTA_CHAIN_MAX,
7937                 .policy         = nft_chain_policy,
7938         },
7939         [NFT_MSG_GETCHAIN] = {
7940                 .call           = nf_tables_getchain,
7941                 .type           = NFNL_CB_RCU,
7942                 .attr_count     = NFTA_CHAIN_MAX,
7943                 .policy         = nft_chain_policy,
7944         },
7945         [NFT_MSG_DELCHAIN] = {
7946                 .call           = nf_tables_delchain,
7947                 .type           = NFNL_CB_BATCH,
7948                 .attr_count     = NFTA_CHAIN_MAX,
7949                 .policy         = nft_chain_policy,
7950         },
7951         [NFT_MSG_NEWRULE] = {
7952                 .call           = nf_tables_newrule,
7953                 .type           = NFNL_CB_BATCH,
7954                 .attr_count     = NFTA_RULE_MAX,
7955                 .policy         = nft_rule_policy,
7956         },
7957         [NFT_MSG_GETRULE] = {
7958                 .call           = nf_tables_getrule,
7959                 .type           = NFNL_CB_RCU,
7960                 .attr_count     = NFTA_RULE_MAX,
7961                 .policy         = nft_rule_policy,
7962         },
7963         [NFT_MSG_DELRULE] = {
7964                 .call           = nf_tables_delrule,
7965                 .type           = NFNL_CB_BATCH,
7966                 .attr_count     = NFTA_RULE_MAX,
7967                 .policy         = nft_rule_policy,
7968         },
7969         [NFT_MSG_NEWSET] = {
7970                 .call           = nf_tables_newset,
7971                 .type           = NFNL_CB_BATCH,
7972                 .attr_count     = NFTA_SET_MAX,
7973                 .policy         = nft_set_policy,
7974         },
7975         [NFT_MSG_GETSET] = {
7976                 .call           = nf_tables_getset,
7977                 .type           = NFNL_CB_RCU,
7978                 .attr_count     = NFTA_SET_MAX,
7979                 .policy         = nft_set_policy,
7980         },
7981         [NFT_MSG_DELSET] = {
7982                 .call           = nf_tables_delset,
7983                 .type           = NFNL_CB_BATCH,
7984                 .attr_count     = NFTA_SET_MAX,
7985                 .policy         = nft_set_policy,
7986         },
7987         [NFT_MSG_NEWSETELEM] = {
7988                 .call           = nf_tables_newsetelem,
7989                 .type           = NFNL_CB_BATCH,
7990                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7991                 .policy         = nft_set_elem_list_policy,
7992         },
7993         [NFT_MSG_GETSETELEM] = {
7994                 .call           = nf_tables_getsetelem,
7995                 .type           = NFNL_CB_RCU,
7996                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7997                 .policy         = nft_set_elem_list_policy,
7998         },
7999         [NFT_MSG_DELSETELEM] = {
8000                 .call           = nf_tables_delsetelem,
8001                 .type           = NFNL_CB_BATCH,
8002                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8003                 .policy         = nft_set_elem_list_policy,
8004         },
8005         [NFT_MSG_GETGEN] = {
8006                 .call           = nf_tables_getgen,
8007                 .type           = NFNL_CB_RCU,
8008         },
8009         [NFT_MSG_NEWOBJ] = {
8010                 .call           = nf_tables_newobj,
8011                 .type           = NFNL_CB_BATCH,
8012                 .attr_count     = NFTA_OBJ_MAX,
8013                 .policy         = nft_obj_policy,
8014         },
8015         [NFT_MSG_GETOBJ] = {
8016                 .call           = nf_tables_getobj,
8017                 .type           = NFNL_CB_RCU,
8018                 .attr_count     = NFTA_OBJ_MAX,
8019                 .policy         = nft_obj_policy,
8020         },
8021         [NFT_MSG_DELOBJ] = {
8022                 .call           = nf_tables_delobj,
8023                 .type           = NFNL_CB_BATCH,
8024                 .attr_count     = NFTA_OBJ_MAX,
8025                 .policy         = nft_obj_policy,
8026         },
8027         [NFT_MSG_GETOBJ_RESET] = {
8028                 .call           = nf_tables_getobj,
8029                 .type           = NFNL_CB_RCU,
8030                 .attr_count     = NFTA_OBJ_MAX,
8031                 .policy         = nft_obj_policy,
8032         },
8033         [NFT_MSG_NEWFLOWTABLE] = {
8034                 .call           = nf_tables_newflowtable,
8035                 .type           = NFNL_CB_BATCH,
8036                 .attr_count     = NFTA_FLOWTABLE_MAX,
8037                 .policy         = nft_flowtable_policy,
8038         },
8039         [NFT_MSG_GETFLOWTABLE] = {
8040                 .call           = nf_tables_getflowtable,
8041                 .type           = NFNL_CB_RCU,
8042                 .attr_count     = NFTA_FLOWTABLE_MAX,
8043                 .policy         = nft_flowtable_policy,
8044         },
8045         [NFT_MSG_DELFLOWTABLE] = {
8046                 .call           = nf_tables_delflowtable,
8047                 .type           = NFNL_CB_BATCH,
8048                 .attr_count     = NFTA_FLOWTABLE_MAX,
8049                 .policy         = nft_flowtable_policy,
8050         },
8051 };
8052
8053 static int nf_tables_validate(struct net *net)
8054 {
8055         struct nftables_pernet *nft_net = nft_pernet(net);
8056         struct nft_table *table;
8057
8058         switch (nft_net->validate_state) {
8059         case NFT_VALIDATE_SKIP:
8060                 break;
8061         case NFT_VALIDATE_NEED:
8062                 nft_validate_state_update(net, NFT_VALIDATE_DO);
8063                 fallthrough;
8064         case NFT_VALIDATE_DO:
8065                 list_for_each_entry(table, &nft_net->tables, list) {
8066                         if (nft_table_validate(net, table) < 0)
8067                                 return -EAGAIN;
8068                 }
8069                 break;
8070         }
8071
8072         return 0;
8073 }
8074
8075 /* a drop policy has to be deferred until all rules have been activated,
8076  * otherwise a large ruleset that contains a drop-policy base chain will
8077  * cause all packets to get dropped until the full transaction has been
8078  * processed.
8079  *
8080  * We defer the drop policy until the transaction has been finalized.
8081  */
8082 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8083 {
8084         struct nft_base_chain *basechain;
8085
8086         if (nft_trans_chain_policy(trans) != NF_DROP)
8087                 return;
8088
8089         if (!nft_is_base_chain(trans->ctx.chain))
8090                 return;
8091
8092         basechain = nft_base_chain(trans->ctx.chain);
8093         basechain->policy = NF_DROP;
8094 }
8095
8096 static void nft_chain_commit_update(struct nft_trans *trans)
8097 {
8098         struct nft_base_chain *basechain;
8099
8100         if (nft_trans_chain_name(trans)) {
8101                 rhltable_remove(&trans->ctx.table->chains_ht,
8102                                 &trans->ctx.chain->rhlhead,
8103                                 nft_chain_ht_params);
8104                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8105                 rhltable_insert_key(&trans->ctx.table->chains_ht,
8106                                     trans->ctx.chain->name,
8107                                     &trans->ctx.chain->rhlhead,
8108                                     nft_chain_ht_params);
8109         }
8110
8111         if (!nft_is_base_chain(trans->ctx.chain))
8112                 return;
8113
8114         nft_chain_stats_replace(trans);
8115
8116         basechain = nft_base_chain(trans->ctx.chain);
8117
8118         switch (nft_trans_chain_policy(trans)) {
8119         case NF_DROP:
8120         case NF_ACCEPT:
8121                 basechain->policy = nft_trans_chain_policy(trans);
8122                 break;
8123         }
8124 }
8125
8126 static void nft_obj_commit_update(struct nft_trans *trans)
8127 {
8128         struct nft_object *newobj;
8129         struct nft_object *obj;
8130
8131         obj = nft_trans_obj(trans);
8132         newobj = nft_trans_obj_newobj(trans);
8133
8134         if (obj->ops->update)
8135                 obj->ops->update(obj, newobj);
8136
8137         kfree(newobj);
8138 }
8139
8140 static void nft_commit_release(struct nft_trans *trans)
8141 {
8142         switch (trans->msg_type) {
8143         case NFT_MSG_DELTABLE:
8144                 nf_tables_table_destroy(&trans->ctx);
8145                 break;
8146         case NFT_MSG_NEWCHAIN:
8147                 free_percpu(nft_trans_chain_stats(trans));
8148                 kfree(nft_trans_chain_name(trans));
8149                 break;
8150         case NFT_MSG_DELCHAIN:
8151                 nf_tables_chain_destroy(&trans->ctx);
8152                 break;
8153         case NFT_MSG_DELRULE:
8154                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8155                 break;
8156         case NFT_MSG_DELSET:
8157                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8158                 break;
8159         case NFT_MSG_DELSETELEM:
8160                 nf_tables_set_elem_destroy(&trans->ctx,
8161                                            nft_trans_elem_set(trans),
8162                                            nft_trans_elem(trans).priv);
8163                 break;
8164         case NFT_MSG_DELOBJ:
8165                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8166                 break;
8167         case NFT_MSG_DELFLOWTABLE:
8168                 if (nft_trans_flowtable_update(trans))
8169                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8170                 else
8171                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8172                 break;
8173         }
8174
8175         if (trans->put_net)
8176                 put_net(trans->ctx.net);
8177
8178         kfree(trans);
8179 }
8180
8181 static void nf_tables_trans_destroy_work(struct work_struct *w)
8182 {
8183         struct nft_trans *trans, *next;
8184         LIST_HEAD(head);
8185
8186         spin_lock(&nf_tables_destroy_list_lock);
8187         list_splice_init(&nf_tables_destroy_list, &head);
8188         spin_unlock(&nf_tables_destroy_list_lock);
8189
8190         if (list_empty(&head))
8191                 return;
8192
8193         synchronize_rcu();
8194
8195         list_for_each_entry_safe(trans, next, &head, list) {
8196                 list_del(&trans->list);
8197                 nft_commit_release(trans);
8198         }
8199 }
8200
8201 void nf_tables_trans_destroy_flush_work(void)
8202 {
8203         flush_work(&trans_destroy_work);
8204 }
8205 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8206
8207 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8208 {
8209         struct nft_rule *rule;
8210         unsigned int alloc = 0;
8211         int i;
8212
8213         /* already handled or inactive chain? */
8214         if (chain->rules_next || !nft_is_active_next(net, chain))
8215                 return 0;
8216
8217         rule = list_entry(&chain->rules, struct nft_rule, list);
8218         i = 0;
8219
8220         list_for_each_entry_continue(rule, &chain->rules, list) {
8221                 if (nft_is_active_next(net, rule))
8222                         alloc++;
8223         }
8224
8225         chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
8226         if (!chain->rules_next)
8227                 return -ENOMEM;
8228
8229         list_for_each_entry_continue(rule, &chain->rules, list) {
8230                 if (nft_is_active_next(net, rule))
8231                         chain->rules_next[i++] = rule;
8232         }
8233
8234         chain->rules_next[i] = NULL;
8235         return 0;
8236 }
8237
8238 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8239 {
8240         struct nftables_pernet *nft_net = nft_pernet(net);
8241         struct nft_trans *trans, *next;
8242
8243         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8244                 struct nft_chain *chain = trans->ctx.chain;
8245
8246                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8247                     trans->msg_type == NFT_MSG_DELRULE) {
8248                         kvfree(chain->rules_next);
8249                         chain->rules_next = NULL;
8250                 }
8251         }
8252 }
8253
8254 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8255 {
8256         struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8257
8258         kvfree(o->start);
8259 }
8260
8261 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
8262 {
8263         struct nft_rule **r = rules;
8264         struct nft_rules_old *old;
8265
8266         while (*r)
8267                 r++;
8268
8269         r++;    /* rcu_head is after end marker */
8270         old = (void *) r;
8271         old->start = rules;
8272
8273         call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8274 }
8275
8276 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8277 {
8278         struct nft_rule **g0, **g1;
8279         bool next_genbit;
8280
8281         next_genbit = nft_gencursor_next(net);
8282
8283         g0 = rcu_dereference_protected(chain->rules_gen_0,
8284                                        lockdep_commit_lock_is_held(net));
8285         g1 = rcu_dereference_protected(chain->rules_gen_1,
8286                                        lockdep_commit_lock_is_held(net));
8287
8288         /* No changes to this chain? */
8289         if (chain->rules_next == NULL) {
8290                 /* chain had no change in last or next generation */
8291                 if (g0 == g1)
8292                         return;
8293                 /*
8294                  * chain had no change in this generation; make sure next
8295                  * one uses same rules as current generation.
8296                  */
8297                 if (next_genbit) {
8298                         rcu_assign_pointer(chain->rules_gen_1, g0);
8299                         nf_tables_commit_chain_free_rules_old(g1);
8300                 } else {
8301                         rcu_assign_pointer(chain->rules_gen_0, g1);
8302                         nf_tables_commit_chain_free_rules_old(g0);
8303                 }
8304
8305                 return;
8306         }
8307
8308         if (next_genbit)
8309                 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
8310         else
8311                 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
8312
8313         chain->rules_next = NULL;
8314
8315         if (g0 == g1)
8316                 return;
8317
8318         if (next_genbit)
8319                 nf_tables_commit_chain_free_rules_old(g1);
8320         else
8321                 nf_tables_commit_chain_free_rules_old(g0);
8322 }
8323
8324 static void nft_obj_del(struct nft_object *obj)
8325 {
8326         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8327         list_del_rcu(&obj->list);
8328 }
8329
8330 void nft_chain_del(struct nft_chain *chain)
8331 {
8332         struct nft_table *table = chain->table;
8333
8334         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8335                                      nft_chain_ht_params));
8336         list_del_rcu(&chain->list);
8337 }
8338
8339 static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
8340                                     struct list_head *hook_list)
8341 {
8342         struct nft_hook *hook, *next;
8343
8344         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8345                 if (hook->inactive)
8346                         list_move(&hook->list, hook_list);
8347         }
8348 }
8349
8350 static void nf_tables_module_autoload_cleanup(struct net *net)
8351 {
8352         struct nftables_pernet *nft_net = nft_pernet(net);
8353         struct nft_module_request *req, *next;
8354
8355         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8356         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8357                 WARN_ON_ONCE(!req->done);
8358                 list_del(&req->list);
8359                 kfree(req);
8360         }
8361 }
8362
8363 static void nf_tables_commit_release(struct net *net)
8364 {
8365         struct nftables_pernet *nft_net = nft_pernet(net);
8366         struct nft_trans *trans;
8367
8368         /* all side effects have to be made visible.
8369          * For example, if a chain named 'foo' has been deleted, a
8370          * new transaction must not find it anymore.
8371          *
8372          * Memory reclaim happens asynchronously from work queue
8373          * to prevent expensive synchronize_rcu() in commit phase.
8374          */
8375         if (list_empty(&nft_net->commit_list)) {
8376                 nf_tables_module_autoload_cleanup(net);
8377                 mutex_unlock(&nft_net->commit_mutex);
8378                 return;
8379         }
8380
8381         trans = list_last_entry(&nft_net->commit_list,
8382                                 struct nft_trans, list);
8383         get_net(trans->ctx.net);
8384         WARN_ON_ONCE(trans->put_net);
8385
8386         trans->put_net = true;
8387         spin_lock(&nf_tables_destroy_list_lock);
8388         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
8389         spin_unlock(&nf_tables_destroy_list_lock);
8390
8391         nf_tables_module_autoload_cleanup(net);
8392         schedule_work(&trans_destroy_work);
8393
8394         mutex_unlock(&nft_net->commit_mutex);
8395 }
8396
8397 static void nft_commit_notify(struct net *net, u32 portid)
8398 {
8399         struct nftables_pernet *nft_net = nft_pernet(net);
8400         struct sk_buff *batch_skb = NULL, *nskb, *skb;
8401         unsigned char *data;
8402         int len;
8403
8404         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
8405                 if (!batch_skb) {
8406 new_batch:
8407                         batch_skb = skb;
8408                         len = NLMSG_GOODSIZE - skb->len;
8409                         list_del(&skb->list);
8410                         continue;
8411                 }
8412                 len -= skb->len;
8413                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8414                         data = skb_put(batch_skb, skb->len);
8415                         memcpy(data, skb->data, skb->len);
8416                         list_del(&skb->list);
8417                         kfree_skb(skb);
8418                         continue;
8419                 }
8420                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8421                                NFT_CB(batch_skb).report, GFP_KERNEL);
8422                 goto new_batch;
8423         }
8424
8425         if (batch_skb) {
8426                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8427                                NFT_CB(batch_skb).report, GFP_KERNEL);
8428         }
8429
8430         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
8431 }
8432
8433 static int nf_tables_commit_audit_alloc(struct list_head *adl,
8434                                         struct nft_table *table)
8435 {
8436         struct nft_audit_data *adp;
8437
8438         list_for_each_entry(adp, adl, list) {
8439                 if (adp->table == table)
8440                         return 0;
8441         }
8442         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
8443         if (!adp)
8444                 return -ENOMEM;
8445         adp->table = table;
8446         list_add(&adp->list, adl);
8447         return 0;
8448 }
8449
8450 static void nf_tables_commit_audit_collect(struct list_head *adl,
8451                                            struct nft_table *table, u32 op)
8452 {
8453         struct nft_audit_data *adp;
8454
8455         list_for_each_entry(adp, adl, list) {
8456                 if (adp->table == table)
8457                         goto found;
8458         }
8459         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
8460         return;
8461 found:
8462         adp->entries++;
8463         if (!adp->op || adp->op > op)
8464                 adp->op = op;
8465 }
8466
8467 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
8468
8469 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
8470 {
8471         struct nft_audit_data *adp, *adn;
8472         char aubuf[AUNFTABLENAMELEN];
8473
8474         list_for_each_entry_safe(adp, adn, adl, list) {
8475                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
8476                          generation);
8477                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
8478                                 nft2audit_op[adp->op], GFP_KERNEL);
8479                 list_del(&adp->list);
8480                 kfree(adp);
8481         }
8482 }
8483
8484 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8485 {
8486         struct nftables_pernet *nft_net = nft_pernet(net);
8487         struct nft_trans *trans, *next;
8488         struct nft_trans_elem *te;
8489         struct nft_chain *chain;
8490         struct nft_table *table;
8491         LIST_HEAD(adl);
8492         int err;
8493
8494         if (list_empty(&nft_net->commit_list)) {
8495                 mutex_unlock(&nft_net->commit_mutex);
8496                 return 0;
8497         }
8498
8499         /* 0. Validate ruleset, otherwise roll back for error reporting. */
8500         if (nf_tables_validate(net) < 0)
8501                 return -EAGAIN;
8502
8503         err = nft_flow_rule_offload_commit(net);
8504         if (err < 0)
8505                 return err;
8506
8507         /* 1.  Allocate space for next generation rules_gen_X[] */
8508         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8509                 int ret;
8510
8511                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
8512                 if (ret) {
8513                         nf_tables_commit_chain_prepare_cancel(net);
8514                         return ret;
8515                 }
8516                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8517                     trans->msg_type == NFT_MSG_DELRULE) {
8518                         chain = trans->ctx.chain;
8519
8520                         ret = nf_tables_commit_chain_prepare(net, chain);
8521                         if (ret < 0) {
8522                                 nf_tables_commit_chain_prepare_cancel(net);
8523                                 return ret;
8524                         }
8525                 }
8526         }
8527
8528         /* step 2.  Make rules_gen_X visible to packet path */
8529         list_for_each_entry(table, &nft_net->tables, list) {
8530                 list_for_each_entry(chain, &table->chains, list)
8531                         nf_tables_commit_chain(net, chain);
8532         }
8533
8534         /*
8535          * Bump generation counter, invalidate any dump in progress.
8536          * Cannot fail after this point.
8537          */
8538         while (++nft_net->base_seq == 0)
8539                 ;
8540
8541         /* step 3. Start new generation, rules_gen_X now in use. */
8542         net->nft.gencursor = nft_gencursor_next(net);
8543
8544         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8545                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
8546                                                trans->msg_type);
8547                 switch (trans->msg_type) {
8548                 case NFT_MSG_NEWTABLE:
8549                         if (nft_trans_table_update(trans)) {
8550                                 if (nft_trans_table_state(trans) == NFT_TABLE_STATE_DORMANT)
8551                                         nf_tables_table_disable(net, trans->ctx.table);
8552
8553                                 trans->ctx.table->flags = nft_trans_table_flags(trans);
8554                         } else {
8555                                 nft_clear(net, trans->ctx.table);
8556                         }
8557                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8558                         nft_trans_destroy(trans);
8559                         break;
8560                 case NFT_MSG_DELTABLE:
8561                         list_del_rcu(&trans->ctx.table->list);
8562                         nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8563                         break;
8564                 case NFT_MSG_NEWCHAIN:
8565                         if (nft_trans_chain_update(trans)) {
8566                                 nft_chain_commit_update(trans);
8567                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8568                                 /* trans destroyed after rcu grace period */
8569                         } else {
8570                                 nft_chain_commit_drop_policy(trans);
8571                                 nft_clear(net, trans->ctx.chain);
8572                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8573                                 nft_trans_destroy(trans);
8574                         }
8575                         break;
8576                 case NFT_MSG_DELCHAIN:
8577                         nft_chain_del(trans->ctx.chain);
8578                         nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8579                         nf_tables_unregister_hook(trans->ctx.net,
8580                                                   trans->ctx.table,
8581                                                   trans->ctx.chain);
8582                         break;
8583                 case NFT_MSG_NEWRULE:
8584                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8585                         nf_tables_rule_notify(&trans->ctx,
8586                                               nft_trans_rule(trans),
8587                                               NFT_MSG_NEWRULE);
8588                         nft_trans_destroy(trans);
8589                         break;
8590                 case NFT_MSG_DELRULE:
8591                         list_del_rcu(&nft_trans_rule(trans)->list);
8592                         nf_tables_rule_notify(&trans->ctx,
8593                                               nft_trans_rule(trans),
8594                                               NFT_MSG_DELRULE);
8595                         nft_rule_expr_deactivate(&trans->ctx,
8596                                                  nft_trans_rule(trans),
8597                                                  NFT_TRANS_COMMIT);
8598                         break;
8599                 case NFT_MSG_NEWSET:
8600                         nft_clear(net, nft_trans_set(trans));
8601                         /* This avoids hitting -EBUSY when deleting the table
8602                          * from the transaction.
8603                          */
8604                         if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8605                             !list_empty(&nft_trans_set(trans)->bindings))
8606                                 trans->ctx.table->use--;
8607
8608                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8609                                              NFT_MSG_NEWSET, GFP_KERNEL);
8610                         nft_trans_destroy(trans);
8611                         break;
8612                 case NFT_MSG_DELSET:
8613                         list_del_rcu(&nft_trans_set(trans)->list);
8614                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8615                                              NFT_MSG_DELSET, GFP_KERNEL);
8616                         break;
8617                 case NFT_MSG_NEWSETELEM:
8618                         te = (struct nft_trans_elem *)trans->data;
8619
8620                         nft_setelem_activate(net, te->set, &te->elem);
8621                         nf_tables_setelem_notify(&trans->ctx, te->set,
8622                                                  &te->elem,
8623                                                  NFT_MSG_NEWSETELEM, 0);
8624                         nft_trans_destroy(trans);
8625                         break;
8626                 case NFT_MSG_DELSETELEM:
8627                         te = (struct nft_trans_elem *)trans->data;
8628
8629                         nf_tables_setelem_notify(&trans->ctx, te->set,
8630                                                  &te->elem,
8631                                                  NFT_MSG_DELSETELEM, 0);
8632                         nft_setelem_remove(net, te->set, &te->elem);
8633                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
8634                                 atomic_dec(&te->set->nelems);
8635                                 te->set->ndeact--;
8636                         }
8637                         break;
8638                 case NFT_MSG_NEWOBJ:
8639                         if (nft_trans_obj_update(trans)) {
8640                                 nft_obj_commit_update(trans);
8641                                 nf_tables_obj_notify(&trans->ctx,
8642                                                      nft_trans_obj(trans),
8643                                                      NFT_MSG_NEWOBJ);
8644                         } else {
8645                                 nft_clear(net, nft_trans_obj(trans));
8646                                 nf_tables_obj_notify(&trans->ctx,
8647                                                      nft_trans_obj(trans),
8648                                                      NFT_MSG_NEWOBJ);
8649                                 nft_trans_destroy(trans);
8650                         }
8651                         break;
8652                 case NFT_MSG_DELOBJ:
8653                         nft_obj_del(nft_trans_obj(trans));
8654                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8655                                              NFT_MSG_DELOBJ);
8656                         break;
8657                 case NFT_MSG_NEWFLOWTABLE:
8658                         if (nft_trans_flowtable_update(trans)) {
8659                                 nft_trans_flowtable(trans)->data.flags =
8660                                         nft_trans_flowtable_flags(trans);
8661                                 nf_tables_flowtable_notify(&trans->ctx,
8662                                                            nft_trans_flowtable(trans),
8663                                                            &nft_trans_flowtable_hooks(trans),
8664                                                            NFT_MSG_NEWFLOWTABLE);
8665                                 list_splice(&nft_trans_flowtable_hooks(trans),
8666                                             &nft_trans_flowtable(trans)->hook_list);
8667                         } else {
8668                                 nft_clear(net, nft_trans_flowtable(trans));
8669                                 nf_tables_flowtable_notify(&trans->ctx,
8670                                                            nft_trans_flowtable(trans),
8671                                                            &nft_trans_flowtable(trans)->hook_list,
8672                                                            NFT_MSG_NEWFLOWTABLE);
8673                         }
8674                         nft_trans_destroy(trans);
8675                         break;
8676                 case NFT_MSG_DELFLOWTABLE:
8677                         if (nft_trans_flowtable_update(trans)) {
8678                                 nft_flowtable_hooks_del(nft_trans_flowtable(trans),
8679                                                         &nft_trans_flowtable_hooks(trans));
8680                                 nf_tables_flowtable_notify(&trans->ctx,
8681                                                            nft_trans_flowtable(trans),
8682                                                            &nft_trans_flowtable_hooks(trans),
8683                                                            NFT_MSG_DELFLOWTABLE);
8684                                 nft_unregister_flowtable_net_hooks(net,
8685                                                                    &nft_trans_flowtable_hooks(trans));
8686                         } else {
8687                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8688                                 nf_tables_flowtable_notify(&trans->ctx,
8689                                                            nft_trans_flowtable(trans),
8690                                                            &nft_trans_flowtable(trans)->hook_list,
8691                                                            NFT_MSG_DELFLOWTABLE);
8692                                 nft_unregister_flowtable_net_hooks(net,
8693                                                 &nft_trans_flowtable(trans)->hook_list);
8694                         }
8695                         break;
8696                 }
8697         }
8698
8699         nft_commit_notify(net, NETLINK_CB(skb).portid);
8700         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8701         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
8702         nf_tables_commit_release(net);
8703
8704         return 0;
8705 }
8706
8707 static void nf_tables_module_autoload(struct net *net)
8708 {
8709         struct nftables_pernet *nft_net = nft_pernet(net);
8710         struct nft_module_request *req, *next;
8711         LIST_HEAD(module_list);
8712
8713         list_splice_init(&nft_net->module_list, &module_list);
8714         mutex_unlock(&nft_net->commit_mutex);
8715         list_for_each_entry_safe(req, next, &module_list, list) {
8716                 request_module("%s", req->module);
8717                 req->done = true;
8718         }
8719         mutex_lock(&nft_net->commit_mutex);
8720         list_splice(&module_list, &nft_net->module_list);
8721 }
8722
8723 static void nf_tables_abort_release(struct nft_trans *trans)
8724 {
8725         switch (trans->msg_type) {
8726         case NFT_MSG_NEWTABLE:
8727                 nf_tables_table_destroy(&trans->ctx);
8728                 break;
8729         case NFT_MSG_NEWCHAIN:
8730                 nf_tables_chain_destroy(&trans->ctx);
8731                 break;
8732         case NFT_MSG_NEWRULE:
8733                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8734                 break;
8735         case NFT_MSG_NEWSET:
8736                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8737                 break;
8738         case NFT_MSG_NEWSETELEM:
8739                 nft_set_elem_destroy(nft_trans_elem_set(trans),
8740                                      nft_trans_elem(trans).priv, true);
8741                 break;
8742         case NFT_MSG_NEWOBJ:
8743                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8744                 break;
8745         case NFT_MSG_NEWFLOWTABLE:
8746                 if (nft_trans_flowtable_update(trans))
8747                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8748                 else
8749                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8750                 break;
8751         }
8752         kfree(trans);
8753 }
8754
8755 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
8756 {
8757         struct nftables_pernet *nft_net = nft_pernet(net);
8758         struct nft_trans *trans, *next;
8759         struct nft_trans_elem *te;
8760         struct nft_hook *hook;
8761
8762         if (action == NFNL_ABORT_VALIDATE &&
8763             nf_tables_validate(net) < 0)
8764                 return -EAGAIN;
8765
8766         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
8767                                          list) {
8768                 switch (trans->msg_type) {
8769                 case NFT_MSG_NEWTABLE:
8770                         if (nft_trans_table_update(trans)) {
8771                                 if (nft_trans_table_state(trans) == NFT_TABLE_STATE_WAKEUP)
8772                                         nf_tables_table_disable(net, trans->ctx.table);
8773
8774                                 nft_trans_destroy(trans);
8775                         } else {
8776                                 list_del_rcu(&trans->ctx.table->list);
8777                         }
8778                         break;
8779                 case NFT_MSG_DELTABLE:
8780                         nft_clear(trans->ctx.net, trans->ctx.table);
8781                         nft_trans_destroy(trans);
8782                         break;
8783                 case NFT_MSG_NEWCHAIN:
8784                         if (nft_trans_chain_update(trans)) {
8785                                 free_percpu(nft_trans_chain_stats(trans));
8786                                 kfree(nft_trans_chain_name(trans));
8787                                 nft_trans_destroy(trans);
8788                         } else {
8789                                 if (nft_chain_is_bound(trans->ctx.chain)) {
8790                                         nft_trans_destroy(trans);
8791                                         break;
8792                                 }
8793                                 trans->ctx.table->use--;
8794                                 nft_chain_del(trans->ctx.chain);
8795                                 nf_tables_unregister_hook(trans->ctx.net,
8796                                                           trans->ctx.table,
8797                                                           trans->ctx.chain);
8798                         }
8799                         break;
8800                 case NFT_MSG_DELCHAIN:
8801                         trans->ctx.table->use++;
8802                         nft_clear(trans->ctx.net, trans->ctx.chain);
8803                         nft_trans_destroy(trans);
8804                         break;
8805                 case NFT_MSG_NEWRULE:
8806                         trans->ctx.chain->use--;
8807                         list_del_rcu(&nft_trans_rule(trans)->list);
8808                         nft_rule_expr_deactivate(&trans->ctx,
8809                                                  nft_trans_rule(trans),
8810                                                  NFT_TRANS_ABORT);
8811                         break;
8812                 case NFT_MSG_DELRULE:
8813                         trans->ctx.chain->use++;
8814                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8815                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
8816                         nft_trans_destroy(trans);
8817                         break;
8818                 case NFT_MSG_NEWSET:
8819                         trans->ctx.table->use--;
8820                         if (nft_trans_set_bound(trans)) {
8821                                 nft_trans_destroy(trans);
8822                                 break;
8823                         }
8824                         list_del_rcu(&nft_trans_set(trans)->list);
8825                         break;
8826                 case NFT_MSG_DELSET:
8827                         trans->ctx.table->use++;
8828                         nft_clear(trans->ctx.net, nft_trans_set(trans));
8829                         nft_trans_destroy(trans);
8830                         break;
8831                 case NFT_MSG_NEWSETELEM:
8832                         if (nft_trans_elem_set_bound(trans)) {
8833                                 nft_trans_destroy(trans);
8834                                 break;
8835                         }
8836                         te = (struct nft_trans_elem *)trans->data;
8837                         nft_setelem_remove(net, te->set, &te->elem);
8838                         if (!nft_setelem_is_catchall(te->set, &te->elem))
8839                                 atomic_dec(&te->set->nelems);
8840                         break;
8841                 case NFT_MSG_DELSETELEM:
8842                         te = (struct nft_trans_elem *)trans->data;
8843
8844                         nft_setelem_data_activate(net, te->set, &te->elem);
8845                         nft_setelem_activate(net, te->set, &te->elem);
8846                         if (!nft_setelem_is_catchall(te->set, &te->elem))
8847                                 te->set->ndeact--;
8848
8849                         nft_trans_destroy(trans);
8850                         break;
8851                 case NFT_MSG_NEWOBJ:
8852                         if (nft_trans_obj_update(trans)) {
8853                                 kfree(nft_trans_obj_newobj(trans));
8854                                 nft_trans_destroy(trans);
8855                         } else {
8856                                 trans->ctx.table->use--;
8857                                 nft_obj_del(nft_trans_obj(trans));
8858                         }
8859                         break;
8860                 case NFT_MSG_DELOBJ:
8861                         trans->ctx.table->use++;
8862                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
8863                         nft_trans_destroy(trans);
8864                         break;
8865                 case NFT_MSG_NEWFLOWTABLE:
8866                         if (nft_trans_flowtable_update(trans)) {
8867                                 nft_unregister_flowtable_net_hooks(net,
8868                                                 &nft_trans_flowtable_hooks(trans));
8869                         } else {
8870                                 trans->ctx.table->use--;
8871                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8872                                 nft_unregister_flowtable_net_hooks(net,
8873                                                 &nft_trans_flowtable(trans)->hook_list);
8874                         }
8875                         break;
8876                 case NFT_MSG_DELFLOWTABLE:
8877                         if (nft_trans_flowtable_update(trans)) {
8878                                 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
8879                                         hook->inactive = false;
8880                         } else {
8881                                 trans->ctx.table->use++;
8882                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
8883                         }
8884                         nft_trans_destroy(trans);
8885                         break;
8886                 }
8887         }
8888
8889         synchronize_rcu();
8890
8891         list_for_each_entry_safe_reverse(trans, next,
8892                                          &nft_net->commit_list, list) {
8893                 list_del(&trans->list);
8894                 nf_tables_abort_release(trans);
8895         }
8896
8897         if (action == NFNL_ABORT_AUTOLOAD)
8898                 nf_tables_module_autoload(net);
8899         else
8900                 nf_tables_module_autoload_cleanup(net);
8901
8902         return 0;
8903 }
8904
8905 static void nf_tables_cleanup(struct net *net)
8906 {
8907         nft_validate_state_update(net, NFT_VALIDATE_SKIP);
8908 }
8909
8910 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
8911                            enum nfnl_abort_action action)
8912 {
8913         struct nftables_pernet *nft_net = nft_pernet(net);
8914         int ret = __nf_tables_abort(net, action);
8915
8916         mutex_unlock(&nft_net->commit_mutex);
8917
8918         return ret;
8919 }
8920
8921 static bool nf_tables_valid_genid(struct net *net, u32 genid)
8922 {
8923         struct nftables_pernet *nft_net = nft_pernet(net);
8924         bool genid_ok;
8925
8926         mutex_lock(&nft_net->commit_mutex);
8927
8928         genid_ok = genid == 0 || nft_net->base_seq == genid;
8929         if (!genid_ok)
8930                 mutex_unlock(&nft_net->commit_mutex);
8931
8932         /* else, commit mutex has to be released by commit or abort function */
8933         return genid_ok;
8934 }
8935
8936 static const struct nfnetlink_subsystem nf_tables_subsys = {
8937         .name           = "nf_tables",
8938         .subsys_id      = NFNL_SUBSYS_NFTABLES,
8939         .cb_count       = NFT_MSG_MAX,
8940         .cb             = nf_tables_cb,
8941         .commit         = nf_tables_commit,
8942         .abort          = nf_tables_abort,
8943         .cleanup        = nf_tables_cleanup,
8944         .valid_genid    = nf_tables_valid_genid,
8945         .owner          = THIS_MODULE,
8946 };
8947
8948 int nft_chain_validate_dependency(const struct nft_chain *chain,
8949                                   enum nft_chain_types type)
8950 {
8951         const struct nft_base_chain *basechain;
8952
8953         if (nft_is_base_chain(chain)) {
8954                 basechain = nft_base_chain(chain);
8955                 if (basechain->type->type != type)
8956                         return -EOPNOTSUPP;
8957         }
8958         return 0;
8959 }
8960 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
8961
8962 int nft_chain_validate_hooks(const struct nft_chain *chain,
8963                              unsigned int hook_flags)
8964 {
8965         struct nft_base_chain *basechain;
8966
8967         if (nft_is_base_chain(chain)) {
8968                 basechain = nft_base_chain(chain);
8969
8970                 if ((1 << basechain->ops.hooknum) & hook_flags)
8971                         return 0;
8972
8973                 return -EOPNOTSUPP;
8974         }
8975
8976         return 0;
8977 }
8978 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
8979
8980 /*
8981  * Loop detection - walk through the ruleset beginning at the destination chain
8982  * of a new jump until either the source chain is reached (loop) or all
8983  * reachable chains have been traversed.
8984  *
8985  * The loop check is performed whenever a new jump verdict is added to an
8986  * expression or verdict map or a verdict map is bound to a new chain.
8987  */
8988
8989 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8990                                  const struct nft_chain *chain);
8991
8992 static int nft_check_loops(const struct nft_ctx *ctx,
8993                            const struct nft_set_ext *ext)
8994 {
8995         const struct nft_data *data;
8996         int ret;
8997
8998         data = nft_set_ext_data(ext);
8999         switch (data->verdict.code) {
9000         case NFT_JUMP:
9001         case NFT_GOTO:
9002                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9003                 break;
9004         default:
9005                 ret = 0;
9006                 break;
9007         }
9008
9009         return ret;
9010 }
9011
9012 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9013                                         struct nft_set *set,
9014                                         const struct nft_set_iter *iter,
9015                                         struct nft_set_elem *elem)
9016 {
9017         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9018
9019         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9020             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9021                 return 0;
9022
9023         return nft_check_loops(ctx, ext);
9024 }
9025
9026 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9027                                   struct nft_set *set)
9028 {
9029         u8 genmask = nft_genmask_next(ctx->net);
9030         struct nft_set_elem_catchall *catchall;
9031         struct nft_set_ext *ext;
9032         int ret = 0;
9033
9034         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9035                 ext = nft_set_elem_ext(set, catchall->elem);
9036                 if (!nft_set_elem_active(ext, genmask))
9037                         continue;
9038
9039                 ret = nft_check_loops(ctx, ext);
9040                 if (ret < 0)
9041                         return ret;
9042         }
9043
9044         return ret;
9045 }
9046
9047 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9048                                  const struct nft_chain *chain)
9049 {
9050         const struct nft_rule *rule;
9051         const struct nft_expr *expr, *last;
9052         struct nft_set *set;
9053         struct nft_set_binding *binding;
9054         struct nft_set_iter iter;
9055
9056         if (ctx->chain == chain)
9057                 return -ELOOP;
9058
9059         list_for_each_entry(rule, &chain->rules, list) {
9060                 nft_rule_for_each_expr(expr, last, rule) {
9061                         struct nft_immediate_expr *priv;
9062                         const struct nft_data *data;
9063                         int err;
9064
9065                         if (strcmp(expr->ops->type->name, "immediate"))
9066                                 continue;
9067
9068                         priv = nft_expr_priv(expr);
9069                         if (priv->dreg != NFT_REG_VERDICT)
9070                                 continue;
9071
9072                         data = &priv->data;
9073                         switch (data->verdict.code) {
9074                         case NFT_JUMP:
9075                         case NFT_GOTO:
9076                                 err = nf_tables_check_loops(ctx,
9077                                                         data->verdict.chain);
9078                                 if (err < 0)
9079                                         return err;
9080                                 break;
9081                         default:
9082                                 break;
9083                         }
9084                 }
9085         }
9086
9087         list_for_each_entry(set, &ctx->table->sets, list) {
9088                 if (!nft_is_active_next(ctx->net, set))
9089                         continue;
9090                 if (!(set->flags & NFT_SET_MAP) ||
9091                     set->dtype != NFT_DATA_VERDICT)
9092                         continue;
9093
9094                 list_for_each_entry(binding, &set->bindings, list) {
9095                         if (!(binding->flags & NFT_SET_MAP) ||
9096                             binding->chain != chain)
9097                                 continue;
9098
9099                         iter.genmask    = nft_genmask_next(ctx->net);
9100                         iter.skip       = 0;
9101                         iter.count      = 0;
9102                         iter.err        = 0;
9103                         iter.fn         = nf_tables_loop_check_setelem;
9104
9105                         set->ops->walk(ctx, set, &iter);
9106                         if (!iter.err)
9107                                 iter.err = nft_set_catchall_loops(ctx, set);
9108
9109                         if (iter.err < 0)
9110                                 return iter.err;
9111                 }
9112         }
9113
9114         return 0;
9115 }
9116
9117 /**
9118  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
9119  *
9120  *      @attr: netlink attribute to fetch value from
9121  *      @max: maximum value to be stored in dest
9122  *      @dest: pointer to the variable
9123  *
9124  *      Parse, check and store a given u32 netlink attribute into variable.
9125  *      This function returns -ERANGE if the value goes over maximum value.
9126  *      Otherwise a 0 is returned and the attribute value is stored in the
9127  *      destination variable.
9128  */
9129 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9130 {
9131         u32 val;
9132
9133         val = ntohl(nla_get_be32(attr));
9134         if (val > max)
9135                 return -ERANGE;
9136
9137         *dest = val;
9138         return 0;
9139 }
9140 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9141
9142 static unsigned int nft_parse_register(const struct nlattr *attr)
9143 {
9144         unsigned int reg;
9145
9146         reg = ntohl(nla_get_be32(attr));
9147         switch (reg) {
9148         case NFT_REG_VERDICT...NFT_REG_4:
9149                 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9150         default:
9151                 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9152         }
9153 }
9154
9155 /**
9156  *      nft_dump_register - dump a register value to a netlink attribute
9157  *
9158  *      @skb: socket buffer
9159  *      @attr: attribute number
9160  *      @reg: register number
9161  *
9162  *      Construct a netlink attribute containing the register number. For
9163  *      compatibility reasons, register numbers being a multiple of 4 are
9164  *      translated to the corresponding 128 bit register numbers.
9165  */
9166 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9167 {
9168         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9169                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9170         else
9171                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9172
9173         return nla_put_be32(skb, attr, htonl(reg));
9174 }
9175 EXPORT_SYMBOL_GPL(nft_dump_register);
9176
9177 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9178 {
9179         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9180                 return -EINVAL;
9181         if (len == 0)
9182                 return -EINVAL;
9183         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9184                 return -ERANGE;
9185
9186         return 0;
9187 }
9188
9189 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9190 {
9191         u32 reg;
9192         int err;
9193
9194         reg = nft_parse_register(attr);
9195         err = nft_validate_register_load(reg, len);
9196         if (err < 0)
9197                 return err;
9198
9199         *sreg = reg;
9200         return 0;
9201 }
9202 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9203
9204 static int nft_validate_register_store(const struct nft_ctx *ctx,
9205                                        enum nft_registers reg,
9206                                        const struct nft_data *data,
9207                                        enum nft_data_types type,
9208                                        unsigned int len)
9209 {
9210         int err;
9211
9212         switch (reg) {
9213         case NFT_REG_VERDICT:
9214                 if (type != NFT_DATA_VERDICT)
9215                         return -EINVAL;
9216
9217                 if (data != NULL &&
9218                     (data->verdict.code == NFT_GOTO ||
9219                      data->verdict.code == NFT_JUMP)) {
9220                         err = nf_tables_check_loops(ctx, data->verdict.chain);
9221                         if (err < 0)
9222                                 return err;
9223                 }
9224
9225                 return 0;
9226         default:
9227                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9228                         return -EINVAL;
9229                 if (len == 0)
9230                         return -EINVAL;
9231                 if (reg * NFT_REG32_SIZE + len >
9232                     sizeof_field(struct nft_regs, data))
9233                         return -ERANGE;
9234
9235                 if (data != NULL && type != NFT_DATA_VALUE)
9236                         return -EINVAL;
9237                 return 0;
9238         }
9239 }
9240
9241 int nft_parse_register_store(const struct nft_ctx *ctx,
9242                              const struct nlattr *attr, u8 *dreg,
9243                              const struct nft_data *data,
9244                              enum nft_data_types type, unsigned int len)
9245 {
9246         int err;
9247         u32 reg;
9248
9249         reg = nft_parse_register(attr);
9250         err = nft_validate_register_store(ctx, reg, data, type, len);
9251         if (err < 0)
9252                 return err;
9253
9254         *dreg = reg;
9255         return 0;
9256 }
9257 EXPORT_SYMBOL_GPL(nft_parse_register_store);
9258
9259 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9260         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
9261         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
9262                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
9263         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9264 };
9265
9266 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9267                             struct nft_data_desc *desc, const struct nlattr *nla)
9268 {
9269         u8 genmask = nft_genmask_next(ctx->net);
9270         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9271         struct nft_chain *chain;
9272         int err;
9273
9274         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9275                                           nft_verdict_policy, NULL);
9276         if (err < 0)
9277                 return err;
9278
9279         if (!tb[NFTA_VERDICT_CODE])
9280                 return -EINVAL;
9281         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9282
9283         switch (data->verdict.code) {
9284         default:
9285                 switch (data->verdict.code & NF_VERDICT_MASK) {
9286                 case NF_ACCEPT:
9287                 case NF_DROP:
9288                 case NF_QUEUE:
9289                         break;
9290                 default:
9291                         return -EINVAL;
9292                 }
9293                 fallthrough;
9294         case NFT_CONTINUE:
9295         case NFT_BREAK:
9296         case NFT_RETURN:
9297                 break;
9298         case NFT_JUMP:
9299         case NFT_GOTO:
9300                 if (tb[NFTA_VERDICT_CHAIN]) {
9301                         chain = nft_chain_lookup(ctx->net, ctx->table,
9302                                                  tb[NFTA_VERDICT_CHAIN],
9303                                                  genmask);
9304                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9305                         chain = nft_chain_lookup_byid(ctx->net,
9306                                                       tb[NFTA_VERDICT_CHAIN_ID]);
9307                         if (IS_ERR(chain))
9308                                 return PTR_ERR(chain);
9309                 } else {
9310                         return -EINVAL;
9311                 }
9312
9313                 if (IS_ERR(chain))
9314                         return PTR_ERR(chain);
9315                 if (nft_is_base_chain(chain))
9316                         return -EOPNOTSUPP;
9317
9318                 chain->use++;
9319                 data->verdict.chain = chain;
9320                 break;
9321         }
9322
9323         desc->len = sizeof(data->verdict);
9324         desc->type = NFT_DATA_VERDICT;
9325         return 0;
9326 }
9327
9328 static void nft_verdict_uninit(const struct nft_data *data)
9329 {
9330         struct nft_chain *chain;
9331         struct nft_rule *rule;
9332
9333         switch (data->verdict.code) {
9334         case NFT_JUMP:
9335         case NFT_GOTO:
9336                 chain = data->verdict.chain;
9337                 chain->use--;
9338
9339                 if (!nft_chain_is_bound(chain))
9340                         break;
9341
9342                 chain->table->use--;
9343                 list_for_each_entry(rule, &chain->rules, list)
9344                         chain->use--;
9345
9346                 nft_chain_del(chain);
9347                 break;
9348         }
9349 }
9350
9351 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
9352 {
9353         struct nlattr *nest;
9354
9355         nest = nla_nest_start_noflag(skb, type);
9356         if (!nest)
9357                 goto nla_put_failure;
9358
9359         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
9360                 goto nla_put_failure;
9361
9362         switch (v->code) {
9363         case NFT_JUMP:
9364         case NFT_GOTO:
9365                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
9366                                    v->chain->name))
9367                         goto nla_put_failure;
9368         }
9369         nla_nest_end(skb, nest);
9370         return 0;
9371
9372 nla_put_failure:
9373         return -1;
9374 }
9375
9376 static int nft_value_init(const struct nft_ctx *ctx,
9377                           struct nft_data *data, unsigned int size,
9378                           struct nft_data_desc *desc, const struct nlattr *nla)
9379 {
9380         unsigned int len;
9381
9382         len = nla_len(nla);
9383         if (len == 0)
9384                 return -EINVAL;
9385         if (len > size)
9386                 return -EOVERFLOW;
9387
9388         nla_memcpy(data->data, nla, len);
9389         desc->type = NFT_DATA_VALUE;
9390         desc->len  = len;
9391         return 0;
9392 }
9393
9394 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
9395                           unsigned int len)
9396 {
9397         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
9398 }
9399
9400 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
9401         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
9402         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
9403 };
9404
9405 /**
9406  *      nft_data_init - parse nf_tables data netlink attributes
9407  *
9408  *      @ctx: context of the expression using the data
9409  *      @data: destination struct nft_data
9410  *      @size: maximum data length
9411  *      @desc: data description
9412  *      @nla: netlink attribute containing data
9413  *
9414  *      Parse the netlink data attributes and initialize a struct nft_data.
9415  *      The type and length of data are returned in the data description.
9416  *
9417  *      The caller can indicate that it only wants to accept data of type
9418  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
9419  */
9420 int nft_data_init(const struct nft_ctx *ctx,
9421                   struct nft_data *data, unsigned int size,
9422                   struct nft_data_desc *desc, const struct nlattr *nla)
9423 {
9424         struct nlattr *tb[NFTA_DATA_MAX + 1];
9425         int err;
9426
9427         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
9428                                           nft_data_policy, NULL);
9429         if (err < 0)
9430                 return err;
9431
9432         if (tb[NFTA_DATA_VALUE])
9433                 return nft_value_init(ctx, data, size, desc,
9434                                       tb[NFTA_DATA_VALUE]);
9435         if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
9436                 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
9437         return -EINVAL;
9438 }
9439 EXPORT_SYMBOL_GPL(nft_data_init);
9440
9441 /**
9442  *      nft_data_release - release a nft_data item
9443  *
9444  *      @data: struct nft_data to release
9445  *      @type: type of data
9446  *
9447  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
9448  *      all others need to be released by calling this function.
9449  */
9450 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
9451 {
9452         if (type < NFT_DATA_VERDICT)
9453                 return;
9454         switch (type) {
9455         case NFT_DATA_VERDICT:
9456                 return nft_verdict_uninit(data);
9457         default:
9458                 WARN_ON(1);
9459         }
9460 }
9461 EXPORT_SYMBOL_GPL(nft_data_release);
9462
9463 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9464                   enum nft_data_types type, unsigned int len)
9465 {
9466         struct nlattr *nest;
9467         int err;
9468
9469         nest = nla_nest_start_noflag(skb, attr);
9470         if (nest == NULL)
9471                 return -1;
9472
9473         switch (type) {
9474         case NFT_DATA_VALUE:
9475                 err = nft_value_dump(skb, data, len);
9476                 break;
9477         case NFT_DATA_VERDICT:
9478                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
9479                 break;
9480         default:
9481                 err = -EINVAL;
9482                 WARN_ON(1);
9483         }
9484
9485         nla_nest_end(skb, nest);
9486         return err;
9487 }
9488 EXPORT_SYMBOL_GPL(nft_data_dump);
9489
9490 int __nft_release_basechain(struct nft_ctx *ctx)
9491 {
9492         struct nft_rule *rule, *nr;
9493
9494         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9495                 return 0;
9496
9497         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
9498         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9499                 list_del(&rule->list);
9500                 ctx->chain->use--;
9501                 nf_tables_rule_release(ctx, rule);
9502         }
9503         nft_chain_del(ctx->chain);
9504         ctx->table->use--;
9505         nf_tables_chain_destroy(ctx);
9506
9507         return 0;
9508 }
9509 EXPORT_SYMBOL_GPL(__nft_release_basechain);
9510
9511 static void __nft_release_hook(struct net *net, struct nft_table *table)
9512 {
9513         struct nft_chain *chain;
9514
9515         list_for_each_entry(chain, &table->chains, list)
9516                 nf_tables_unregister_hook(net, table, chain);
9517 }
9518
9519 static void __nft_release_hooks(struct net *net)
9520 {
9521         struct nftables_pernet *nft_net = nft_pernet(net);
9522         struct nft_table *table;
9523
9524         list_for_each_entry(table, &nft_net->tables, list) {
9525                 if (nft_table_has_owner(table))
9526                         continue;
9527
9528                 __nft_release_hook(net, table);
9529         }
9530 }
9531
9532 static void __nft_release_table(struct net *net, struct nft_table *table)
9533 {
9534         struct nft_flowtable *flowtable, *nf;
9535         struct nft_chain *chain, *nc;
9536         struct nft_object *obj, *ne;
9537         struct nft_rule *rule, *nr;
9538         struct nft_set *set, *ns;
9539         struct nft_ctx ctx = {
9540                 .net    = net,
9541                 .family = NFPROTO_NETDEV,
9542         };
9543
9544         ctx.family = table->family;
9545         ctx.table = table;
9546         list_for_each_entry(chain, &table->chains, list) {
9547                 ctx.chain = chain;
9548                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
9549                         list_del(&rule->list);
9550                         chain->use--;
9551                         nf_tables_rule_release(&ctx, rule);
9552                 }
9553         }
9554         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
9555                 list_del(&flowtable->list);
9556                 table->use--;
9557                 nf_tables_flowtable_destroy(flowtable);
9558         }
9559         list_for_each_entry_safe(set, ns, &table->sets, list) {
9560                 list_del(&set->list);
9561                 table->use--;
9562                 nft_set_destroy(&ctx, set);
9563         }
9564         list_for_each_entry_safe(obj, ne, &table->objects, list) {
9565                 nft_obj_del(obj);
9566                 table->use--;
9567                 nft_obj_destroy(&ctx, obj);
9568         }
9569         list_for_each_entry_safe(chain, nc, &table->chains, list) {
9570                 ctx.chain = chain;
9571                 nft_chain_del(chain);
9572                 table->use--;
9573                 nf_tables_chain_destroy(&ctx);
9574         }
9575         list_del(&table->list);
9576         nf_tables_table_destroy(&ctx);
9577 }
9578
9579 static void __nft_release_tables(struct net *net)
9580 {
9581         struct nftables_pernet *nft_net = nft_pernet(net);
9582         struct nft_table *table, *nt;
9583
9584         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
9585                 if (nft_table_has_owner(table))
9586                         continue;
9587
9588                 __nft_release_table(net, table);
9589         }
9590 }
9591
9592 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
9593                             void *ptr)
9594 {
9595         struct nftables_pernet *nft_net;
9596         struct netlink_notify *n = ptr;
9597         struct nft_table *table, *nt;
9598         struct net *net = n->net;
9599         bool release = false;
9600
9601         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
9602                 return NOTIFY_DONE;
9603
9604         nft_net = nft_pernet(net);
9605         mutex_lock(&nft_net->commit_mutex);
9606         list_for_each_entry(table, &nft_net->tables, list) {
9607                 if (nft_table_has_owner(table) &&
9608                     n->portid == table->nlpid) {
9609                         __nft_release_hook(net, table);
9610                         release = true;
9611                 }
9612         }
9613         if (release) {
9614                 synchronize_rcu();
9615                 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
9616                         if (nft_table_has_owner(table) &&
9617                             n->portid == table->nlpid)
9618                                 __nft_release_table(net, table);
9619                 }
9620         }
9621         mutex_unlock(&nft_net->commit_mutex);
9622
9623         return NOTIFY_DONE;
9624 }
9625
9626 static struct notifier_block nft_nl_notifier = {
9627         .notifier_call  = nft_rcv_nl_event,
9628 };
9629
9630 static int __net_init nf_tables_init_net(struct net *net)
9631 {
9632         struct nftables_pernet *nft_net = nft_pernet(net);
9633
9634         INIT_LIST_HEAD(&nft_net->tables);
9635         INIT_LIST_HEAD(&nft_net->commit_list);
9636         INIT_LIST_HEAD(&nft_net->module_list);
9637         INIT_LIST_HEAD(&nft_net->notify_list);
9638         mutex_init(&nft_net->commit_mutex);
9639         nft_net->base_seq = 1;
9640         nft_net->validate_state = NFT_VALIDATE_SKIP;
9641
9642         return 0;
9643 }
9644
9645 static void __net_exit nf_tables_pre_exit_net(struct net *net)
9646 {
9647         __nft_release_hooks(net);
9648 }
9649
9650 static void __net_exit nf_tables_exit_net(struct net *net)
9651 {
9652         struct nftables_pernet *nft_net = nft_pernet(net);
9653
9654         mutex_lock(&nft_net->commit_mutex);
9655         if (!list_empty(&nft_net->commit_list))
9656                 __nf_tables_abort(net, NFNL_ABORT_NONE);
9657         __nft_release_tables(net);
9658         mutex_unlock(&nft_net->commit_mutex);
9659         WARN_ON_ONCE(!list_empty(&nft_net->tables));
9660         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
9661         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9662 }
9663
9664 static struct pernet_operations nf_tables_net_ops = {
9665         .init           = nf_tables_init_net,
9666         .pre_exit       = nf_tables_pre_exit_net,
9667         .exit           = nf_tables_exit_net,
9668         .id             = &nf_tables_net_id,
9669         .size           = sizeof(struct nftables_pernet),
9670 };
9671
9672 static int __init nf_tables_module_init(void)
9673 {
9674         int err;
9675
9676         err = register_pernet_subsys(&nf_tables_net_ops);
9677         if (err < 0)
9678                 return err;
9679
9680         err = nft_chain_filter_init();
9681         if (err < 0)
9682                 goto err_chain_filter;
9683
9684         err = nf_tables_core_module_init();
9685         if (err < 0)
9686                 goto err_core_module;
9687
9688         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
9689         if (err < 0)
9690                 goto err_netdev_notifier;
9691
9692         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
9693         if (err < 0)
9694                 goto err_rht_objname;
9695
9696         err = nft_offload_init();
9697         if (err < 0)
9698                 goto err_offload;
9699
9700         err = netlink_register_notifier(&nft_nl_notifier);
9701         if (err < 0)
9702                 goto err_netlink_notifier;
9703
9704         /* must be last */
9705         err = nfnetlink_subsys_register(&nf_tables_subsys);
9706         if (err < 0)
9707                 goto err_nfnl_subsys;
9708
9709         nft_chain_route_init();
9710
9711         return err;
9712
9713 err_nfnl_subsys:
9714         netlink_unregister_notifier(&nft_nl_notifier);
9715 err_netlink_notifier:
9716         nft_offload_exit();
9717 err_offload:
9718         rhltable_destroy(&nft_objname_ht);
9719 err_rht_objname:
9720         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9721 err_netdev_notifier:
9722         nf_tables_core_module_exit();
9723 err_core_module:
9724         nft_chain_filter_fini();
9725 err_chain_filter:
9726         unregister_pernet_subsys(&nf_tables_net_ops);
9727         return err;
9728 }
9729
9730 static void __exit nf_tables_module_exit(void)
9731 {
9732         nfnetlink_subsys_unregister(&nf_tables_subsys);
9733         netlink_unregister_notifier(&nft_nl_notifier);
9734         nft_offload_exit();
9735         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9736         nft_chain_filter_fini();
9737         nft_chain_route_fini();
9738         unregister_pernet_subsys(&nf_tables_net_ops);
9739         cancel_work_sync(&trans_destroy_work);
9740         rcu_barrier();
9741         rhltable_destroy(&nft_objname_ht);
9742         nf_tables_core_module_exit();
9743 }
9744
9745 module_init(nf_tables_module_init);
9746 module_exit(nf_tables_module_exit);
9747
9748 MODULE_LICENSE("GPL");
9749 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
9750 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);