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                             nlpid && 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, u32 nlpid)
 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                         if (nft_table_has_owner(table) &&
 596                             nlpid && table->nlpid != nlpid)
 597                                 return ERR_PTR(-EPERM);
 598
 599                         return table;
 600                 }
 601         }
 602
 603         return ERR_PTR(-ENOENT);
 604 }
 605
 606 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 607 {
 608         return ++table->hgenerator;
 609 }
 610
 611 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 612
 613 static const struct nft_chain_type *
 614 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 615 {
 616         if (family >= NFPROTO_NUMPROTO ||
 617             type >= NFT_CHAIN_T_MAX)
 618                 return NULL;
 619
 620         return chain_type[family][type];
 621 }
 622
 623 static const struct nft_chain_type *
 624 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 625 {
 626         const struct nft_chain_type *type;
 627         int i;
 628
 629         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 630                 type = __nft_chain_type_get(family, i);
 631                 if (!type)
 632                         continue;
 633                 if (!nla_strcmp(nla, type->name))
 634                         return type;
 635         }
 636         return NULL;
 637 }
 638
 639 struct nft_module_request {
 640         struct list_head        list;
 641         char                    module[MODULE_NAME_LEN];
 642         bool                    done;
 643 };
 644
 645 #ifdef CONFIG_MODULES
 646 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 647                                       ...)
 648 {
 649         char module_name[MODULE_NAME_LEN];
 650         struct nftables_pernet *nft_net;
 651         struct nft_module_request *req;
 652         va_list args;
 653         int ret;
 654
 655         va_start(args, fmt);
 656         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 657         va_end(args);
 658         if (ret >= MODULE_NAME_LEN)
 659                 return 0;
 660
 661         nft_net = nft_pernet(net);
 662         list_for_each_entry(req, &nft_net->module_list, list) {
 663                 if (!strcmp(req->module, module_name)) {
 664                         if (req->done)
 665                                 return 0;
 666
 667                         /* A request to load this module already exists. */
 668                         return -EAGAIN;
 669                 }
 670         }
 671
 672         req = kmalloc(sizeof(*req), GFP_KERNEL);
 673         if (!req)
 674                 return -ENOMEM;
 675
 676         req->done = false;
 677         strlcpy(req->module, module_name, MODULE_NAME_LEN);
 678         list_add_tail(&req->list, &nft_net->module_list);
 679
 680         return -EAGAIN;
 681 }
 682 EXPORT_SYMBOL_GPL(nft_request_module);
 683 #endif
 684
 685 static void lockdep_nfnl_nft_mutex_not_held(void)
 686 {
 687 #ifdef CONFIG_PROVE_LOCKING
 688         if (debug_locks)
 689                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 690 #endif
 691 }
 692
 693 static const struct nft_chain_type *
 694 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 695                             u8 family, bool autoload)
 696 {
 697         const struct nft_chain_type *type;
 698
 699         type = __nf_tables_chain_type_lookup(nla, family);
 700         if (type != NULL)
 701                 return type;
 702
 703         lockdep_nfnl_nft_mutex_not_held();
 704 #ifdef CONFIG_MODULES
 705         if (autoload) {
 706                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 707                                        nla_len(nla),
 708                                        (const char *)nla_data(nla)) == -EAGAIN)
 709                         return ERR_PTR(-EAGAIN);
 710         }
 711 #endif
 712         return ERR_PTR(-ENOENT);
 713 }
 714
 715 static __be16 nft_base_seq(const struct net *net)
 716 {
 717         struct nftables_pernet *nft_net = nft_pernet(net);
 718
 719         return htons(nft_net->base_seq & 0xffff);
 720 }
 721
 722 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 723         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 724                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 725         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 726         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 727         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 728                                     .len = NFT_USERDATA_MAXLEN }
 729 };
 730
 731 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 732                                      u32 portid, u32 seq, int event, u32 flags,
 733                                      int family, const struct nft_table *table)
 734 {
 735         struct nlmsghdr *nlh;
 736
 737         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 738         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 739                            NFNETLINK_V0, nft_base_seq(net));
 740         if (!nlh)
 741                 goto nla_put_failure;
 742
 743         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 744             nla_put_be32(skb, NFTA_TABLE_FLAGS,
 745                          htonl(table->flags & NFT_TABLE_F_MASK)) ||
 746             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 747             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 748                          NFTA_TABLE_PAD))
 749                 goto nla_put_failure;
 750         if (nft_table_has_owner(table) &&
 751             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 752                 goto nla_put_failure;
 753
 754         if (table->udata) {
 755                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 756                         goto nla_put_failure;
 757         }
 758
 759         nlmsg_end(skb, nlh);
 760         return 0;
 761
 762 nla_put_failure:
 763         nlmsg_trim(skb, nlh);
 764         return -1;
 765 }
 766
 767 struct nftnl_skb_parms {
 768         bool report;
 769 };
 770 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 771
 772 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 773                                struct list_head *notify_list)
 774 {
 775         NFT_CB(skb).report = report;
 776         list_add_tail(&skb->list, notify_list);
 777 }
 778
 779 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 780 {
 781         struct nftables_pernet *nft_net;
 782         struct sk_buff *skb;
 783         u16 flags = 0;
 784         int err;
 785
 786         if (!ctx->report &&
 787             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 788                 return;
 789
 790         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 791         if (skb == NULL)
 792                 goto err;
 793
 794         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
 795                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
 796
 797         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 798                                         event, flags, ctx->family, ctx->table);
 799         if (err < 0) {
 800                 kfree_skb(skb);
 801                 goto err;
 802         }
 803
 804         nft_net = nft_pernet(ctx->net);
 805         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
 806         return;
 807 err:
 808         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 809 }
 810
 811 static int nf_tables_dump_tables(struct sk_buff *skb,
 812                                  struct netlink_callback *cb)
 813 {
 814         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 815         struct nftables_pernet *nft_net;
 816         const struct nft_table *table;
 817         unsigned int idx = 0, s_idx = cb->args[0];
 818         struct net *net = sock_net(skb->sk);
 819         int family = nfmsg->nfgen_family;
 820
 821         rcu_read_lock();
 822         nft_net = nft_pernet(net);
 823         cb->seq = nft_net->base_seq;
 824
 825         list_for_each_entry_rcu(table, &nft_net->tables, list) {
 826                 if (family != NFPROTO_UNSPEC && family != table->family)
 827                         continue;
 828
 829                 if (idx < s_idx)
 830                         goto cont;
 831                 if (idx > s_idx)
 832                         memset(&cb->args[1], 0,
 833                                sizeof(cb->args) - sizeof(cb->args[0]));
 834                 if (!nft_is_active(net, table))
 835                         continue;
 836                 if (nf_tables_fill_table_info(skb, net,
 837                                               NETLINK_CB(cb->skb).portid,
 838                                               cb->nlh->nlmsg_seq,
 839                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 840                                               table->family, table) < 0)
 841                         goto done;
 842
 843                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 844 cont:
 845                 idx++;
 846         }
 847 done:
 848         rcu_read_unlock();
 849         cb->args[0] = idx;
 850         return skb->len;
 851 }
 852
 853 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 854                                       const struct nlmsghdr *nlh,
 855                                       struct netlink_dump_control *c)
 856 {
 857         int err;
 858
 859         if (!try_module_get(THIS_MODULE))
 860                 return -EINVAL;
 861
 862         rcu_read_unlock();
 863         err = netlink_dump_start(nlsk, skb, nlh, c);
 864         rcu_read_lock();
 865         module_put(THIS_MODULE);
 866
 867         return err;
 868 }
 869
 870 /* called with rcu_read_lock held */
 871 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
 872                               const struct nlattr * const nla[])
 873 {
 874         struct netlink_ext_ack *extack = info->extack;
 875         u8 genmask = nft_genmask_cur(info->net);
 876         u8 family = info->nfmsg->nfgen_family;
 877         const struct nft_table *table;
 878         struct net *net = info->net;
 879         struct sk_buff *skb2;
 880         int err;
 881
 882         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
 883                 struct netlink_dump_control c = {
 884                         .dump = nf_tables_dump_tables,
 885                         .module = THIS_MODULE,
 886                 };
 887
 888                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
 889         }
 890
 891         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
 892         if (IS_ERR(table)) {
 893                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 894                 return PTR_ERR(table);
 895         }
 896
 897         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 898         if (!skb2)
 899                 return -ENOMEM;
 900
 901         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 902                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
 903                                         0, family, table);
 904         if (err < 0)
 905                 goto err_fill_table_info;
 906
 907         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 908
 909 err_fill_table_info:
 910         kfree_skb(skb2);
 911         return err;
 912 }
 913
 914 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
 915 {
 916         struct nft_chain *chain;
 917         u32 i = 0;
 918
 919         list_for_each_entry(chain, &table->chains, list) {
 920                 if (!nft_is_active_next(net, chain))
 921                         continue;
 922                 if (!nft_is_base_chain(chain))
 923                         continue;
 924
 925                 if (cnt && i++ == cnt)
 926                         break;
 927
 928                 nf_tables_unregister_hook(net, table, chain);
 929         }
 930 }
 931
 932 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
 933 {
 934         struct nft_chain *chain;
 935         int err, i = 0;
 936
 937         list_for_each_entry(chain, &table->chains, list) {
 938                 if (!nft_is_active_next(net, chain))
 939                         continue;
 940                 if (!nft_is_base_chain(chain))
 941                         continue;
 942
 943                 err = nf_tables_register_hook(net, table, chain);
 944                 if (err < 0)
 945                         goto err_register_hooks;
 946
 947                 i++;
 948         }
 949         return 0;
 950
 951 err_register_hooks:
 952         if (i)
 953                 nft_table_disable(net, table, i);
 954         return err;
 955 }
 956
 957 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
 958 {
 959         table->flags &= ~NFT_TABLE_F_DORMANT;
 960         nft_table_disable(net, table, 0);
 961         table->flags |= NFT_TABLE_F_DORMANT;
 962 }
 963
 964 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
 965 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
 966 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
 967 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
 968                                          __NFT_TABLE_F_WAS_AWAKEN)
 969
 970 static int nf_tables_updtable(struct nft_ctx *ctx)
 971 {
 972         struct nft_trans *trans;
 973         u32 flags;
 974         int ret;
 975
 976         if (!ctx->nla[NFTA_TABLE_FLAGS])
 977                 return 0;
 978
 979         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
 980         if (flags & ~NFT_TABLE_F_MASK)
 981                 return -EOPNOTSUPP;
 982
 983         if (flags == ctx->table->flags)
 984                 return 0;
 985
 986         if ((nft_table_has_owner(ctx->table) &&
 987              !(flags & NFT_TABLE_F_OWNER)) ||
 988             (!nft_table_has_owner(ctx->table) &&
 989              flags & NFT_TABLE_F_OWNER))
 990                 return -EOPNOTSUPP;
 991
 992         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
 993                                 sizeof(struct nft_trans_table));
 994         if (trans == NULL)
 995                 return -ENOMEM;
 996
 997         if ((flags & NFT_TABLE_F_DORMANT) &&
 998             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
 999                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1000                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1001                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1002         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1003                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1004                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1005                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1006                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1007                         if (ret < 0)
1008                                 goto err_register_hooks;
1009
1010                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1011                 }
1012         }
1013
1014         nft_trans_table_update(trans) = true;
1015         nft_trans_commit_list_add_tail(ctx->net, trans);
1016
1017         return 0;
1018
1019 err_register_hooks:
1020         nft_trans_destroy(trans);
1021         return ret;
1022 }
1023
1024 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1025 {
1026         const char *name = data;
1027
1028         return jhash(name, strlen(name), seed);
1029 }
1030
1031 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1032 {
1033         const struct nft_chain *chain = data;
1034
1035         return nft_chain_hash(chain->name, 0, seed);
1036 }
1037
1038 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1039                               const void *ptr)
1040 {
1041         const struct nft_chain *chain = ptr;
1042         const char *name = arg->key;
1043
1044         return strcmp(chain->name, name);
1045 }
1046
1047 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1048 {
1049         const struct nft_object_hash_key *k = data;
1050
1051         seed ^= hash_ptr(k->table, 32);
1052
1053         return jhash(k->name, strlen(k->name), seed);
1054 }
1055
1056 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1057 {
1058         const struct nft_object *obj = data;
1059
1060         return nft_objname_hash(&obj->key, 0, seed);
1061 }
1062
1063 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1064                                 const void *ptr)
1065 {
1066         const struct nft_object_hash_key *k = arg->key;
1067         const struct nft_object *obj = ptr;
1068
1069         if (obj->key.table != k->table)
1070                 return -1;
1071
1072         return strcmp(obj->key.name, k->name);
1073 }
1074
1075 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1076                               const struct nlattr * const nla[])
1077 {
1078         struct nftables_pernet *nft_net = nft_pernet(info->net);
1079         struct netlink_ext_ack *extack = info->extack;
1080         u8 genmask = nft_genmask_next(info->net);
1081         u8 family = info->nfmsg->nfgen_family;
1082         struct net *net = info->net;
1083         const struct nlattr *attr;
1084         struct nft_table *table;
1085         struct nft_ctx ctx;
1086         u32 flags = 0;
1087         int err;
1088
1089         lockdep_assert_held(&nft_net->commit_mutex);
1090         attr = nla[NFTA_TABLE_NAME];
1091         table = nft_table_lookup(net, attr, family, genmask,
1092                                  NETLINK_CB(skb).portid);
1093         if (IS_ERR(table)) {
1094                 if (PTR_ERR(table) != -ENOENT)
1095                         return PTR_ERR(table);
1096         } else {
1097                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1098                         NL_SET_BAD_ATTR(extack, attr);
1099                         return -EEXIST;
1100                 }
1101                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1102                         return -EOPNOTSUPP;
1103
1104                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1105
1106                 return nf_tables_updtable(&ctx);
1107         }
1108
1109         if (nla[NFTA_TABLE_FLAGS]) {
1110                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1111                 if (flags & ~NFT_TABLE_F_MASK)
1112                         return -EOPNOTSUPP;
1113         }
1114
1115         err = -ENOMEM;
1116         table = kzalloc(sizeof(*table), GFP_KERNEL);
1117         if (table == NULL)
1118                 goto err_kzalloc;
1119
1120         table->name = nla_strdup(attr, GFP_KERNEL);
1121         if (table->name == NULL)
1122                 goto err_strdup;
1123
1124         if (nla[NFTA_TABLE_USERDATA]) {
1125                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL);
1126                 if (table->udata == NULL)
1127                         goto err_table_udata;
1128
1129                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1130         }
1131
1132         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1133         if (err)
1134                 goto err_chain_ht;
1135
1136         INIT_LIST_HEAD(&table->chains);
1137         INIT_LIST_HEAD(&table->sets);
1138         INIT_LIST_HEAD(&table->objects);
1139         INIT_LIST_HEAD(&table->flowtables);
1140         table->family = family;
1141         table->flags = flags;
1142         table->handle = ++table_handle;
1143         if (table->flags & NFT_TABLE_F_OWNER)
1144                 table->nlpid = NETLINK_CB(skb).portid;
1145
1146         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1147         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1148         if (err < 0)
1149                 goto err_trans;
1150
1151         list_add_tail_rcu(&table->list, &nft_net->tables);
1152         return 0;
1153 err_trans:
1154         rhltable_destroy(&table->chains_ht);
1155 err_chain_ht:
1156         kfree(table->udata);
1157 err_table_udata:
1158         kfree(table->name);
1159 err_strdup:
1160         kfree(table);
1161 err_kzalloc:
1162         return err;
1163 }
1164
1165 static int nft_flush_table(struct nft_ctx *ctx)
1166 {
1167         struct nft_flowtable *flowtable, *nft;
1168         struct nft_chain *chain, *nc;
1169         struct nft_object *obj, *ne;
1170         struct nft_set *set, *ns;
1171         int err;
1172
1173         list_for_each_entry(chain, &ctx->table->chains, list) {
1174                 if (!nft_is_active_next(ctx->net, chain))
1175                         continue;
1176
1177                 if (nft_chain_is_bound(chain))
1178                         continue;
1179
1180                 ctx->chain = chain;
1181
1182                 err = nft_delrule_by_chain(ctx);
1183                 if (err < 0)
1184                         goto out;
1185         }
1186
1187         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1188                 if (!nft_is_active_next(ctx->net, set))
1189                         continue;
1190
1191                 if (nft_set_is_anonymous(set) &&
1192                     !list_empty(&set->bindings))
1193                         continue;
1194
1195                 err = nft_delset(ctx, set);
1196                 if (err < 0)
1197                         goto out;
1198         }
1199
1200         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1201                 if (!nft_is_active_next(ctx->net, flowtable))
1202                         continue;
1203
1204                 err = nft_delflowtable(ctx, flowtable);
1205                 if (err < 0)
1206                         goto out;
1207         }
1208
1209         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1210                 if (!nft_is_active_next(ctx->net, obj))
1211                         continue;
1212
1213                 err = nft_delobj(ctx, obj);
1214                 if (err < 0)
1215                         goto out;
1216         }
1217
1218         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1219                 if (!nft_is_active_next(ctx->net, chain))
1220                         continue;
1221
1222                 if (nft_chain_is_bound(chain))
1223                         continue;
1224
1225                 ctx->chain = chain;
1226
1227                 err = nft_delchain(ctx);
1228                 if (err < 0)
1229                         goto out;
1230         }
1231
1232         err = nft_deltable(ctx);
1233 out:
1234         return err;
1235 }
1236
1237 static int nft_flush(struct nft_ctx *ctx, int family)
1238 {
1239         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1240         const struct nlattr * const *nla = ctx->nla;
1241         struct nft_table *table, *nt;
1242         int err = 0;
1243
1244         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1245                 if (family != AF_UNSPEC && table->family != family)
1246                         continue;
1247
1248                 ctx->family = table->family;
1249
1250                 if (!nft_is_active_next(ctx->net, table))
1251                         continue;
1252
1253                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1254                         continue;
1255
1256                 if (nla[NFTA_TABLE_NAME] &&
1257                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1258                         continue;
1259
1260                 ctx->table = table;
1261
1262                 err = nft_flush_table(ctx);
1263                 if (err < 0)
1264                         goto out;
1265         }
1266 out:
1267         return err;
1268 }
1269
1270 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1271                               const struct nlattr * const nla[])
1272 {
1273         struct netlink_ext_ack *extack = info->extack;
1274         u8 genmask = nft_genmask_next(info->net);
1275         u8 family = info->nfmsg->nfgen_family;
1276         struct net *net = info->net;
1277         const struct nlattr *attr;
1278         struct nft_table *table;
1279         struct nft_ctx ctx;
1280
1281         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1282         if (family == AF_UNSPEC ||
1283             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1284                 return nft_flush(&ctx, family);
1285
1286         if (nla[NFTA_TABLE_HANDLE]) {
1287                 attr = nla[NFTA_TABLE_HANDLE];
1288                 table = nft_table_lookup_byhandle(net, attr, genmask,
1289                                                   NETLINK_CB(skb).portid);
1290         } else {
1291                 attr = nla[NFTA_TABLE_NAME];
1292                 table = nft_table_lookup(net, attr, family, genmask,
1293                                          NETLINK_CB(skb).portid);
1294         }
1295
1296         if (IS_ERR(table)) {
1297                 NL_SET_BAD_ATTR(extack, attr);
1298                 return PTR_ERR(table);
1299         }
1300
1301         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1302             table->use > 0)
1303                 return -EBUSY;
1304
1305         ctx.family = family;
1306         ctx.table = table;
1307
1308         return nft_flush_table(&ctx);
1309 }
1310
1311 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1312 {
1313         if (WARN_ON(ctx->table->use > 0))
1314                 return;
1315
1316         rhltable_destroy(&ctx->table->chains_ht);
1317         kfree(ctx->table->name);
1318         kfree(ctx->table->udata);
1319         kfree(ctx->table);
1320 }
1321
1322 void nft_register_chain_type(const struct nft_chain_type *ctype)
1323 {
1324         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1325         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1326                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1327                 return;
1328         }
1329         chain_type[ctype->family][ctype->type] = ctype;
1330         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1331 }
1332 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1333
1334 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1335 {
1336         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1337         chain_type[ctype->family][ctype->type] = NULL;
1338         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1339 }
1340 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1341
1342 /*
1343  * Chains
1344  */
1345
1346 static struct nft_chain *
1347 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1348 {
1349         struct nft_chain *chain;
1350
1351         list_for_each_entry(chain, &table->chains, list) {
1352                 if (chain->handle == handle &&
1353                     nft_active_genmask(chain, genmask))
1354                         return chain;
1355         }
1356
1357         return ERR_PTR(-ENOENT);
1358 }
1359
1360 static bool lockdep_commit_lock_is_held(const struct net *net)
1361 {
1362 #ifdef CONFIG_PROVE_LOCKING
1363         struct nftables_pernet *nft_net = nft_pernet(net);
1364
1365         return lockdep_is_held(&nft_net->commit_mutex);
1366 #else
1367         return true;
1368 #endif
1369 }
1370
1371 static struct nft_chain *nft_chain_lookup(struct net *net,
1372                                           struct nft_table *table,
1373                                           const struct nlattr *nla, u8 genmask)
1374 {
1375         char search[NFT_CHAIN_MAXNAMELEN + 1];
1376         struct rhlist_head *tmp, *list;
1377         struct nft_chain *chain;
1378
1379         if (nla == NULL)
1380                 return ERR_PTR(-EINVAL);
1381
1382         nla_strscpy(search, nla, sizeof(search));
1383
1384         WARN_ON(!rcu_read_lock_held() &&
1385                 !lockdep_commit_lock_is_held(net));
1386
1387         chain = ERR_PTR(-ENOENT);
1388         rcu_read_lock();
1389         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1390         if (!list)
1391                 goto out_unlock;
1392
1393         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1394                 if (nft_active_genmask(chain, genmask))
1395                         goto out_unlock;
1396         }
1397         chain = ERR_PTR(-ENOENT);
1398 out_unlock:
1399         rcu_read_unlock();
1400         return chain;
1401 }
1402
1403 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1404         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1405                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1406         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1407         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1408                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1409         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1410         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1411         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1412                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1413         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1414         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1415         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1416         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1417                                     .len = NFT_USERDATA_MAXLEN },
1418 };
1419
1420 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1421         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1422         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1423         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1424                                     .len = IFNAMSIZ - 1 },
1425 };
1426
1427 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1428 {
1429         struct nft_stats *cpu_stats, total;
1430         struct nlattr *nest;
1431         unsigned int seq;
1432         u64 pkts, bytes;
1433         int cpu;
1434
1435         if (!stats)
1436                 return 0;
1437
1438         memset(&total, 0, sizeof(total));
1439         for_each_possible_cpu(cpu) {
1440                 cpu_stats = per_cpu_ptr(stats, cpu);
1441                 do {
1442                         seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1443                         pkts = cpu_stats->pkts;
1444                         bytes = cpu_stats->bytes;
1445                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1446                 total.pkts += pkts;
1447                 total.bytes += bytes;
1448         }
1449         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1450         if (nest == NULL)
1451                 goto nla_put_failure;
1452
1453         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1454                          NFTA_COUNTER_PAD) ||
1455             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1456                          NFTA_COUNTER_PAD))
1457                 goto nla_put_failure;
1458
1459         nla_nest_end(skb, nest);
1460         return 0;
1461
1462 nla_put_failure:
1463         return -ENOSPC;
1464 }
1465
1466 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1467                                    const struct nft_base_chain *basechain)
1468 {
1469         const struct nf_hook_ops *ops = &basechain->ops;
1470         struct nft_hook *hook, *first = NULL;
1471         struct nlattr *nest, *nest_devs;
1472         int n = 0;
1473
1474         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1475         if (nest == NULL)
1476                 goto nla_put_failure;
1477         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1478                 goto nla_put_failure;
1479         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1480                 goto nla_put_failure;
1481
1482         if (nft_base_chain_netdev(family, ops->hooknum)) {
1483                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1484                 list_for_each_entry(hook, &basechain->hook_list, list) {
1485                         if (!first)
1486                                 first = hook;
1487
1488                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1489                                            hook->ops.dev->name))
1490                                 goto nla_put_failure;
1491                         n++;
1492                 }
1493                 nla_nest_end(skb, nest_devs);
1494
1495                 if (n == 1 &&
1496                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1497                         goto nla_put_failure;
1498         }
1499         nla_nest_end(skb, nest);
1500
1501         return 0;
1502 nla_put_failure:
1503         return -1;
1504 }
1505
1506 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1507                                      u32 portid, u32 seq, int event, u32 flags,
1508                                      int family, const struct nft_table *table,
1509                                      const struct nft_chain *chain)
1510 {
1511         struct nlmsghdr *nlh;
1512
1513         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1514         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1515                            NFNETLINK_V0, nft_base_seq(net));
1516         if (!nlh)
1517                 goto nla_put_failure;
1518
1519         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1520                 goto nla_put_failure;
1521         if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1522                          NFTA_CHAIN_PAD))
1523                 goto nla_put_failure;
1524         if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1525                 goto nla_put_failure;
1526
1527         if (nft_is_base_chain(chain)) {
1528                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1529                 struct nft_stats __percpu *stats;
1530
1531                 if (nft_dump_basechain_hook(skb, family, basechain))
1532                         goto nla_put_failure;
1533
1534                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1535                                  htonl(basechain->policy)))
1536                         goto nla_put_failure;
1537
1538                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1539                         goto nla_put_failure;
1540
1541                 stats = rcu_dereference_check(basechain->stats,
1542                                               lockdep_commit_lock_is_held(net));
1543                 if (nft_dump_stats(skb, stats))
1544                         goto nla_put_failure;
1545         }
1546
1547         if (chain->flags &&
1548             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1549                 goto nla_put_failure;
1550
1551         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1552                 goto nla_put_failure;
1553
1554         if (chain->udata &&
1555             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1556                 goto nla_put_failure;
1557
1558         nlmsg_end(skb, nlh);
1559         return 0;
1560
1561 nla_put_failure:
1562         nlmsg_trim(skb, nlh);
1563         return -1;
1564 }
1565
1566 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1567 {
1568         struct nftables_pernet *nft_net;
1569         struct sk_buff *skb;
1570         u16 flags = 0;
1571         int err;
1572
1573         if (!ctx->report &&
1574             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1575                 return;
1576
1577         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1578         if (skb == NULL)
1579                 goto err;
1580
1581         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1582                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1583
1584         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1585                                         event, flags, ctx->family, ctx->table,
1586                                         ctx->chain);
1587         if (err < 0) {
1588                 kfree_skb(skb);
1589                 goto err;
1590         }
1591
1592         nft_net = nft_pernet(ctx->net);
1593         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1594         return;
1595 err:
1596         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1597 }
1598
1599 static int nf_tables_dump_chains(struct sk_buff *skb,
1600                                  struct netlink_callback *cb)
1601 {
1602         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1603         unsigned int idx = 0, s_idx = cb->args[0];
1604         struct net *net = sock_net(skb->sk);
1605         int family = nfmsg->nfgen_family;
1606         struct nftables_pernet *nft_net;
1607         const struct nft_table *table;
1608         const struct nft_chain *chain;
1609
1610         rcu_read_lock();
1611         nft_net = nft_pernet(net);
1612         cb->seq = nft_net->base_seq;
1613
1614         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1615                 if (family != NFPROTO_UNSPEC && family != table->family)
1616                         continue;
1617
1618                 list_for_each_entry_rcu(chain, &table->chains, list) {
1619                         if (idx < s_idx)
1620                                 goto cont;
1621                         if (idx > s_idx)
1622                                 memset(&cb->args[1], 0,
1623                                        sizeof(cb->args) - sizeof(cb->args[0]));
1624                         if (!nft_is_active(net, chain))
1625                                 continue;
1626                         if (nf_tables_fill_chain_info(skb, net,
1627                                                       NETLINK_CB(cb->skb).portid,
1628                                                       cb->nlh->nlmsg_seq,
1629                                                       NFT_MSG_NEWCHAIN,
1630                                                       NLM_F_MULTI,
1631                                                       table->family, table,
1632                                                       chain) < 0)
1633                                 goto done;
1634
1635                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1636 cont:
1637                         idx++;
1638                 }
1639         }
1640 done:
1641         rcu_read_unlock();
1642         cb->args[0] = idx;
1643         return skb->len;
1644 }
1645
1646 /* called with rcu_read_lock held */
1647 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1648                               const struct nlattr * const nla[])
1649 {
1650         struct netlink_ext_ack *extack = info->extack;
1651         u8 genmask = nft_genmask_cur(info->net);
1652         u8 family = info->nfmsg->nfgen_family;
1653         const struct nft_chain *chain;
1654         struct net *net = info->net;
1655         struct nft_table *table;
1656         struct sk_buff *skb2;
1657         int err;
1658
1659         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1660                 struct netlink_dump_control c = {
1661                         .dump = nf_tables_dump_chains,
1662                         .module = THIS_MODULE,
1663                 };
1664
1665                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1666         }
1667
1668         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1669         if (IS_ERR(table)) {
1670                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1671                 return PTR_ERR(table);
1672         }
1673
1674         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1675         if (IS_ERR(chain)) {
1676                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1677                 return PTR_ERR(chain);
1678         }
1679
1680         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1681         if (!skb2)
1682                 return -ENOMEM;
1683
1684         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1685                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1686                                         0, family, table, chain);
1687         if (err < 0)
1688                 goto err_fill_chain_info;
1689
1690         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1691
1692 err_fill_chain_info:
1693         kfree_skb(skb2);
1694         return err;
1695 }
1696
1697 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1698         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1699         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1700 };
1701
1702 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1703 {
1704         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1705         struct nft_stats __percpu *newstats;
1706         struct nft_stats *stats;
1707         int err;
1708
1709         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1710                                           nft_counter_policy, NULL);
1711         if (err < 0)
1712                 return ERR_PTR(err);
1713
1714         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1715                 return ERR_PTR(-EINVAL);
1716
1717         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1718         if (newstats == NULL)
1719                 return ERR_PTR(-ENOMEM);
1720
1721         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1722          * are not exposed to userspace.
1723          */
1724         preempt_disable();
1725         stats = this_cpu_ptr(newstats);
1726         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1727         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1728         preempt_enable();
1729
1730         return newstats;
1731 }
1732
1733 static void nft_chain_stats_replace(struct nft_trans *trans)
1734 {
1735         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1736
1737         if (!nft_trans_chain_stats(trans))
1738                 return;
1739
1740         nft_trans_chain_stats(trans) =
1741                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1742                                     lockdep_commit_lock_is_held(trans->ctx.net));
1743
1744         if (!nft_trans_chain_stats(trans))
1745                 static_branch_inc(&nft_counters_enabled);
1746 }
1747
1748 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1749 {
1750         struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
1751         struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
1752
1753         if (g0 != g1)
1754                 kvfree(g1);
1755         kvfree(g0);
1756
1757         /* should be NULL either via abort or via successful commit */
1758         WARN_ON_ONCE(chain->blob_next);
1759         kvfree(chain->blob_next);
1760 }
1761
1762 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1763 {
1764         struct nft_chain *chain = ctx->chain;
1765         struct nft_hook *hook, *next;
1766
1767         if (WARN_ON(chain->use > 0))
1768                 return;
1769
1770         /* no concurrent access possible anymore */
1771         nf_tables_chain_free_chain_rules(chain);
1772
1773         if (nft_is_base_chain(chain)) {
1774                 struct nft_base_chain *basechain = nft_base_chain(chain);
1775
1776                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1777                         list_for_each_entry_safe(hook, next,
1778                                                  &basechain->hook_list, list) {
1779                                 list_del_rcu(&hook->list);
1780                                 kfree_rcu(hook, rcu);
1781                         }
1782                 }
1783                 module_put(basechain->type->owner);
1784                 if (rcu_access_pointer(basechain->stats)) {
1785                         static_branch_dec(&nft_counters_enabled);
1786                         free_percpu(rcu_dereference_raw(basechain->stats));
1787                 }
1788                 kfree(chain->name);
1789                 kfree(chain->udata);
1790                 kfree(basechain);
1791         } else {
1792                 kfree(chain->name);
1793                 kfree(chain->udata);
1794                 kfree(chain);
1795         }
1796 }
1797
1798 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1799                                               const struct nlattr *attr)
1800 {
1801         struct net_device *dev;
1802         char ifname[IFNAMSIZ];
1803         struct nft_hook *hook;
1804         int err;
1805
1806         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1807         if (!hook) {
1808                 err = -ENOMEM;
1809                 goto err_hook_alloc;
1810         }
1811
1812         nla_strscpy(ifname, attr, IFNAMSIZ);
1813         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1814          * indirectly serializing all the other holders of the commit_mutex with
1815          * the rtnl_mutex.
1816          */
1817         dev = __dev_get_by_name(net, ifname);
1818         if (!dev) {
1819                 err = -ENOENT;
1820                 goto err_hook_dev;
1821         }
1822         hook->ops.dev = dev;
1823         hook->inactive = false;
1824
1825         return hook;
1826
1827 err_hook_dev:
1828         kfree(hook);
1829 err_hook_alloc:
1830         return ERR_PTR(err);
1831 }
1832
1833 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1834                                            const struct nft_hook *this)
1835 {
1836         struct nft_hook *hook;
1837
1838         list_for_each_entry(hook, hook_list, list) {
1839                 if (this->ops.dev == hook->ops.dev)
1840                         return hook;
1841         }
1842
1843         return NULL;
1844 }
1845
1846 static int nf_tables_parse_netdev_hooks(struct net *net,
1847                                         const struct nlattr *attr,
1848                                         struct list_head *hook_list)
1849 {
1850         struct nft_hook *hook, *next;
1851         const struct nlattr *tmp;
1852         int rem, n = 0, err;
1853
1854         nla_for_each_nested(tmp, attr, rem) {
1855                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1856                         err = -EINVAL;
1857                         goto err_hook;
1858                 }
1859
1860                 hook = nft_netdev_hook_alloc(net, tmp);
1861                 if (IS_ERR(hook)) {
1862                         err = PTR_ERR(hook);
1863                         goto err_hook;
1864                 }
1865                 if (nft_hook_list_find(hook_list, hook)) {
1866                         kfree(hook);
1867                         err = -EEXIST;
1868                         goto err_hook;
1869                 }
1870                 list_add_tail(&hook->list, hook_list);
1871                 n++;
1872
1873                 if (n == NFT_NETDEVICE_MAX) {
1874                         err = -EFBIG;
1875                         goto err_hook;
1876                 }
1877         }
1878
1879         return 0;
1880
1881 err_hook:
1882         list_for_each_entry_safe(hook, next, hook_list, list) {
1883                 list_del(&hook->list);
1884                 kfree(hook);
1885         }
1886         return err;
1887 }
1888
1889 struct nft_chain_hook {
1890         u32                             num;
1891         s32                             priority;
1892         const struct nft_chain_type     *type;
1893         struct list_head                list;
1894 };
1895
1896 static int nft_chain_parse_netdev(struct net *net,
1897                                   struct nlattr *tb[],
1898                                   struct list_head *hook_list)
1899 {
1900         struct nft_hook *hook;
1901         int err;
1902
1903         if (tb[NFTA_HOOK_DEV]) {
1904                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1905                 if (IS_ERR(hook))
1906                         return PTR_ERR(hook);
1907
1908                 list_add_tail(&hook->list, hook_list);
1909         } else if (tb[NFTA_HOOK_DEVS]) {
1910                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1911                                                    hook_list);
1912                 if (err < 0)
1913                         return err;
1914
1915                 if (list_empty(hook_list))
1916                         return -EINVAL;
1917         } else {
1918                 return -EINVAL;
1919         }
1920
1921         return 0;
1922 }
1923
1924 static int nft_chain_parse_hook(struct net *net,
1925                                 const struct nlattr * const nla[],
1926                                 struct nft_chain_hook *hook, u8 family,
1927                                 struct netlink_ext_ack *extack, bool autoload)
1928 {
1929         struct nftables_pernet *nft_net = nft_pernet(net);
1930         struct nlattr *ha[NFTA_HOOK_MAX + 1];
1931         const struct nft_chain_type *type;
1932         int err;
1933
1934         lockdep_assert_held(&nft_net->commit_mutex);
1935         lockdep_nfnl_nft_mutex_not_held();
1936
1937         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1938                                           nla[NFTA_CHAIN_HOOK],
1939                                           nft_hook_policy, NULL);
1940         if (err < 0)
1941                 return err;
1942
1943         if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1944             ha[NFTA_HOOK_PRIORITY] == NULL)
1945                 return -EINVAL;
1946
1947         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1948         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1949
1950         type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1951         if (!type)
1952                 return -EOPNOTSUPP;
1953
1954         if (nla[NFTA_CHAIN_TYPE]) {
1955                 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1956                                                    family, autoload);
1957                 if (IS_ERR(type)) {
1958                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
1959                         return PTR_ERR(type);
1960                 }
1961         }
1962         if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1963                 return -EOPNOTSUPP;
1964
1965         if (type->type == NFT_CHAIN_T_NAT &&
1966             hook->priority <= NF_IP_PRI_CONNTRACK)
1967                 return -EOPNOTSUPP;
1968
1969         if (!try_module_get(type->owner)) {
1970                 if (nla[NFTA_CHAIN_TYPE])
1971                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
1972                 return -ENOENT;
1973         }
1974
1975         hook->type = type;
1976
1977         INIT_LIST_HEAD(&hook->list);
1978         if (nft_base_chain_netdev(family, hook->num)) {
1979                 err = nft_chain_parse_netdev(net, ha, &hook->list);
1980                 if (err < 0) {
1981                         module_put(type->owner);
1982                         return err;
1983                 }
1984         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
1985                 module_put(type->owner);
1986                 return -EOPNOTSUPP;
1987         }
1988
1989         return 0;
1990 }
1991
1992 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1993 {
1994         struct nft_hook *h, *next;
1995
1996         list_for_each_entry_safe(h, next, &hook->list, list) {
1997                 list_del(&h->list);
1998                 kfree(h);
1999         }
2000         module_put(hook->type->owner);
2001 }
2002
2003 struct nft_rules_old {
2004         struct rcu_head h;
2005         struct nft_rule_blob *blob;
2006 };
2007
2008 static void nft_last_rule(struct nft_rule_blob *blob, const void *ptr)
2009 {
2010         struct nft_rule_dp *prule;
2011
2012         prule = (struct nft_rule_dp *)ptr;
2013         prule->is_last = 1;
2014         /* blob size does not include the trailer rule */
2015 }
2016
2017 static struct nft_rule_blob *nf_tables_chain_alloc_rules(unsigned int size)
2018 {
2019         struct nft_rule_blob *blob;
2020
2021         /* size must include room for the last rule */
2022         if (size < offsetof(struct nft_rule_dp, data))
2023                 return NULL;
2024
2025         size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rules_old);
2026         if (size > INT_MAX)
2027                 return NULL;
2028
2029         blob = kvmalloc(size, GFP_KERNEL);
2030         if (!blob)
2031                 return NULL;
2032
2033         blob->size = 0;
2034         nft_last_rule(blob, blob->data);
2035
2036         return blob;
2037 }
2038
2039 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2040                                     const struct nft_chain_hook *hook,
2041                                     struct nft_chain *chain)
2042 {
2043         ops->pf                 = family;
2044         ops->hooknum            = hook->num;
2045         ops->priority           = hook->priority;
2046         ops->priv               = chain;
2047         ops->hook               = hook->type->hooks[ops->hooknum];
2048         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2049 }
2050
2051 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2052                               struct nft_chain_hook *hook, u32 flags)
2053 {
2054         struct nft_chain *chain;
2055         struct nft_hook *h;
2056
2057         basechain->type = hook->type;
2058         INIT_LIST_HEAD(&basechain->hook_list);
2059         chain = &basechain->chain;
2060
2061         if (nft_base_chain_netdev(family, hook->num)) {
2062                 list_splice_init(&hook->list, &basechain->hook_list);
2063                 list_for_each_entry(h, &basechain->hook_list, list)
2064                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2065
2066                 basechain->ops.hooknum  = hook->num;
2067                 basechain->ops.priority = hook->priority;
2068         } else {
2069                 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2070         }
2071
2072         chain->flags |= NFT_CHAIN_BASE | flags;
2073         basechain->policy = NF_ACCEPT;
2074         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2075             nft_chain_offload_priority(basechain) < 0)
2076                 return -EOPNOTSUPP;
2077
2078         flow_block_init(&basechain->flow_block);
2079
2080         return 0;
2081 }
2082
2083 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2084 {
2085         int err;
2086
2087         err = rhltable_insert_key(&table->chains_ht, chain->name,
2088                                   &chain->rhlhead, nft_chain_ht_params);
2089         if (err)
2090                 return err;
2091
2092         list_add_tail_rcu(&chain->list, &table->chains);
2093
2094         return 0;
2095 }
2096
2097 static u64 chain_id;
2098
2099 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2100                               u8 policy, u32 flags,
2101                               struct netlink_ext_ack *extack)
2102 {
2103         const struct nlattr * const *nla = ctx->nla;
2104         struct nft_table *table = ctx->table;
2105         struct nft_base_chain *basechain;
2106         struct nft_stats __percpu *stats;
2107         struct net *net = ctx->net;
2108         char name[NFT_NAME_MAXLEN];
2109         struct nft_rule_blob *blob;
2110         struct nft_trans *trans;
2111         struct nft_chain *chain;
2112         unsigned int data_size;
2113         int err;
2114
2115         if (table->use == UINT_MAX)
2116                 return -EOVERFLOW;
2117
2118         if (nla[NFTA_CHAIN_HOOK]) {
2119                 struct nft_chain_hook hook;
2120
2121                 if (flags & NFT_CHAIN_BINDING)
2122                         return -EOPNOTSUPP;
2123
2124                 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2125                                            true);
2126                 if (err < 0)
2127                         return err;
2128
2129                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
2130                 if (basechain == NULL) {
2131                         nft_chain_release_hook(&hook);
2132                         return -ENOMEM;
2133                 }
2134                 chain = &basechain->chain;
2135
2136                 if (nla[NFTA_CHAIN_COUNTERS]) {
2137                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2138                         if (IS_ERR(stats)) {
2139                                 nft_chain_release_hook(&hook);
2140                                 kfree(basechain);
2141                                 return PTR_ERR(stats);
2142                         }
2143                         rcu_assign_pointer(basechain->stats, stats);
2144                         static_branch_inc(&nft_counters_enabled);
2145                 }
2146
2147                 err = nft_basechain_init(basechain, family, &hook, flags);
2148                 if (err < 0) {
2149                         nft_chain_release_hook(&hook);
2150                         kfree(basechain);
2151                         return err;
2152                 }
2153         } else {
2154                 if (flags & NFT_CHAIN_BASE)
2155                         return -EINVAL;
2156                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2157                         return -EOPNOTSUPP;
2158
2159                 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2160                 if (chain == NULL)
2161                         return -ENOMEM;
2162
2163                 chain->flags = flags;
2164         }
2165         ctx->chain = chain;
2166
2167         INIT_LIST_HEAD(&chain->rules);
2168         chain->handle = nf_tables_alloc_handle(table);
2169         chain->table = table;
2170
2171         if (nla[NFTA_CHAIN_NAME]) {
2172                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2173         } else {
2174                 if (!(flags & NFT_CHAIN_BINDING)) {
2175                         err = -EINVAL;
2176                         goto err_destroy_chain;
2177                 }
2178
2179                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2180                 chain->name = kstrdup(name, GFP_KERNEL);
2181         }
2182
2183         if (!chain->name) {
2184                 err = -ENOMEM;
2185                 goto err_destroy_chain;
2186         }
2187
2188         if (nla[NFTA_CHAIN_USERDATA]) {
2189                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL);
2190                 if (chain->udata == NULL) {
2191                         err = -ENOMEM;
2192                         goto err_destroy_chain;
2193                 }
2194                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2195         }
2196
2197         data_size = offsetof(struct nft_rule_dp, data); /* last rule */
2198         blob = nf_tables_chain_alloc_rules(data_size);
2199         if (!blob) {
2200                 err = -ENOMEM;
2201                 goto err_destroy_chain;
2202         }
2203
2204         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2205         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2206
2207         err = nf_tables_register_hook(net, table, chain);
2208         if (err < 0)
2209                 goto err_destroy_chain;
2210
2211         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2212         if (IS_ERR(trans)) {
2213                 err = PTR_ERR(trans);
2214                 goto err_unregister_hook;
2215         }
2216
2217         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2218         if (nft_is_base_chain(chain))
2219                 nft_trans_chain_policy(trans) = policy;
2220
2221         err = nft_chain_add(table, chain);
2222         if (err < 0) {
2223                 nft_trans_destroy(trans);
2224                 goto err_unregister_hook;
2225         }
2226
2227         table->use++;
2228
2229         return 0;
2230 err_unregister_hook:
2231         nf_tables_unregister_hook(net, table, chain);
2232 err_destroy_chain:
2233         nf_tables_chain_destroy(ctx);
2234
2235         return err;
2236 }
2237
2238 static bool nft_hook_list_equal(struct list_head *hook_list1,
2239                                 struct list_head *hook_list2)
2240 {
2241         struct nft_hook *hook;
2242         int n = 0, m = 0;
2243
2244         n = 0;
2245         list_for_each_entry(hook, hook_list2, list) {
2246                 if (!nft_hook_list_find(hook_list1, hook))
2247                         return false;
2248
2249                 n++;
2250         }
2251         list_for_each_entry(hook, hook_list1, list)
2252                 m++;
2253
2254         return n == m;
2255 }
2256
2257 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2258                               u32 flags, const struct nlattr *attr,
2259                               struct netlink_ext_ack *extack)
2260 {
2261         const struct nlattr * const *nla = ctx->nla;
2262         struct nft_table *table = ctx->table;
2263         struct nft_chain *chain = ctx->chain;
2264         struct nft_base_chain *basechain;
2265         struct nft_stats *stats = NULL;
2266         struct nft_chain_hook hook;
2267         struct nf_hook_ops *ops;
2268         struct nft_trans *trans;
2269         int err;
2270
2271         if (chain->flags ^ flags)
2272                 return -EOPNOTSUPP;
2273
2274         if (nla[NFTA_CHAIN_HOOK]) {
2275                 if (!nft_is_base_chain(chain)) {
2276                         NL_SET_BAD_ATTR(extack, attr);
2277                         return -EEXIST;
2278                 }
2279                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2280                                            extack, false);
2281                 if (err < 0)
2282                         return err;
2283
2284                 basechain = nft_base_chain(chain);
2285                 if (basechain->type != hook.type) {
2286                         nft_chain_release_hook(&hook);
2287                         NL_SET_BAD_ATTR(extack, attr);
2288                         return -EEXIST;
2289                 }
2290
2291                 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2292                         if (!nft_hook_list_equal(&basechain->hook_list,
2293                                                  &hook.list)) {
2294                                 nft_chain_release_hook(&hook);
2295                                 NL_SET_BAD_ATTR(extack, attr);
2296                                 return -EEXIST;
2297                         }
2298                 } else {
2299                         ops = &basechain->ops;
2300                         if (ops->hooknum != hook.num ||
2301                             ops->priority != hook.priority) {
2302                                 nft_chain_release_hook(&hook);
2303                                 NL_SET_BAD_ATTR(extack, attr);
2304                                 return -EEXIST;
2305                         }
2306                 }
2307                 nft_chain_release_hook(&hook);
2308         }
2309
2310         if (nla[NFTA_CHAIN_HANDLE] &&
2311             nla[NFTA_CHAIN_NAME]) {
2312                 struct nft_chain *chain2;
2313
2314                 chain2 = nft_chain_lookup(ctx->net, table,
2315                                           nla[NFTA_CHAIN_NAME], genmask);
2316                 if (!IS_ERR(chain2)) {
2317                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2318                         return -EEXIST;
2319                 }
2320         }
2321
2322         if (nla[NFTA_CHAIN_COUNTERS]) {
2323                 if (!nft_is_base_chain(chain))
2324                         return -EOPNOTSUPP;
2325
2326                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2327                 if (IS_ERR(stats))
2328                         return PTR_ERR(stats);
2329         }
2330
2331         err = -ENOMEM;
2332         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2333                                 sizeof(struct nft_trans_chain));
2334         if (trans == NULL)
2335                 goto err;
2336
2337         nft_trans_chain_stats(trans) = stats;
2338         nft_trans_chain_update(trans) = true;
2339
2340         if (nla[NFTA_CHAIN_POLICY])
2341                 nft_trans_chain_policy(trans) = policy;
2342         else
2343                 nft_trans_chain_policy(trans) = -1;
2344
2345         if (nla[NFTA_CHAIN_HANDLE] &&
2346             nla[NFTA_CHAIN_NAME]) {
2347                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2348                 struct nft_trans *tmp;
2349                 char *name;
2350
2351                 err = -ENOMEM;
2352                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2353                 if (!name)
2354                         goto err;
2355
2356                 err = -EEXIST;
2357                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2358                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2359                             tmp->ctx.table == table &&
2360                             nft_trans_chain_update(tmp) &&
2361                             nft_trans_chain_name(tmp) &&
2362                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2363                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2364                                 kfree(name);
2365                                 goto err;
2366                         }
2367                 }
2368
2369                 nft_trans_chain_name(trans) = name;
2370         }
2371         nft_trans_commit_list_add_tail(ctx->net, trans);
2372
2373         return 0;
2374 err:
2375         free_percpu(stats);
2376         kfree(trans);
2377         return err;
2378 }
2379
2380 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2381                                                const struct nlattr *nla)
2382 {
2383         struct nftables_pernet *nft_net = nft_pernet(net);
2384         u32 id = ntohl(nla_get_be32(nla));
2385         struct nft_trans *trans;
2386
2387         list_for_each_entry(trans, &nft_net->commit_list, list) {
2388                 struct nft_chain *chain = trans->ctx.chain;
2389
2390                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2391                     id == nft_trans_chain_id(trans))
2392                         return chain;
2393         }
2394         return ERR_PTR(-ENOENT);
2395 }
2396
2397 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2398                               const struct nlattr * const nla[])
2399 {
2400         struct nftables_pernet *nft_net = nft_pernet(info->net);
2401         struct netlink_ext_ack *extack = info->extack;
2402         u8 genmask = nft_genmask_next(info->net);
2403         u8 family = info->nfmsg->nfgen_family;
2404         struct nft_chain *chain = NULL;
2405         struct net *net = info->net;
2406         const struct nlattr *attr;
2407         struct nft_table *table;
2408         u8 policy = NF_ACCEPT;
2409         struct nft_ctx ctx;
2410         u64 handle = 0;
2411         u32 flags = 0;
2412
2413         lockdep_assert_held(&nft_net->commit_mutex);
2414
2415         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2416                                  NETLINK_CB(skb).portid);
2417         if (IS_ERR(table)) {
2418                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2419                 return PTR_ERR(table);
2420         }
2421
2422         chain = NULL;
2423         attr = nla[NFTA_CHAIN_NAME];
2424
2425         if (nla[NFTA_CHAIN_HANDLE]) {
2426                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2427                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2428                 if (IS_ERR(chain)) {
2429                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2430                         return PTR_ERR(chain);
2431                 }
2432                 attr = nla[NFTA_CHAIN_HANDLE];
2433         } else if (nla[NFTA_CHAIN_NAME]) {
2434                 chain = nft_chain_lookup(net, table, attr, genmask);
2435                 if (IS_ERR(chain)) {
2436                         if (PTR_ERR(chain) != -ENOENT) {
2437                                 NL_SET_BAD_ATTR(extack, attr);
2438                                 return PTR_ERR(chain);
2439                         }
2440                         chain = NULL;
2441                 }
2442         } else if (!nla[NFTA_CHAIN_ID]) {
2443                 return -EINVAL;
2444         }
2445
2446         if (nla[NFTA_CHAIN_POLICY]) {
2447                 if (chain != NULL &&
2448                     !nft_is_base_chain(chain)) {
2449                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2450                         return -EOPNOTSUPP;
2451                 }
2452
2453                 if (chain == NULL &&
2454                     nla[NFTA_CHAIN_HOOK] == NULL) {
2455                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2456                         return -EOPNOTSUPP;
2457                 }
2458
2459                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2460                 switch (policy) {
2461                 case NF_DROP:
2462                 case NF_ACCEPT:
2463                         break;
2464                 default:
2465                         return -EINVAL;
2466                 }
2467         }
2468
2469         if (nla[NFTA_CHAIN_FLAGS])
2470                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2471         else if (chain)
2472                 flags = chain->flags;
2473
2474         if (flags & ~NFT_CHAIN_FLAGS)
2475                 return -EOPNOTSUPP;
2476
2477         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2478
2479         if (chain != NULL) {
2480                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2481                         NL_SET_BAD_ATTR(extack, attr);
2482                         return -EEXIST;
2483                 }
2484                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2485                         return -EOPNOTSUPP;
2486
2487                 flags |= chain->flags & NFT_CHAIN_BASE;
2488                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2489                                           extack);
2490         }
2491
2492         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2493 }
2494
2495 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2496                               const struct nlattr * const nla[])
2497 {
2498         struct netlink_ext_ack *extack = info->extack;
2499         u8 genmask = nft_genmask_next(info->net);
2500         u8 family = info->nfmsg->nfgen_family;
2501         struct net *net = info->net;
2502         const struct nlattr *attr;
2503         struct nft_table *table;
2504         struct nft_chain *chain;
2505         struct nft_rule *rule;
2506         struct nft_ctx ctx;
2507         u64 handle;
2508         u32 use;
2509         int err;
2510
2511         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2512                                  NETLINK_CB(skb).portid);
2513         if (IS_ERR(table)) {
2514                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2515                 return PTR_ERR(table);
2516         }
2517
2518         if (nla[NFTA_CHAIN_HANDLE]) {
2519                 attr = nla[NFTA_CHAIN_HANDLE];
2520                 handle = be64_to_cpu(nla_get_be64(attr));
2521                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2522         } else {
2523                 attr = nla[NFTA_CHAIN_NAME];
2524                 chain = nft_chain_lookup(net, table, attr, genmask);
2525         }
2526         if (IS_ERR(chain)) {
2527                 NL_SET_BAD_ATTR(extack, attr);
2528                 return PTR_ERR(chain);
2529         }
2530
2531         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2532             chain->use > 0)
2533                 return -EBUSY;
2534
2535         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2536
2537         use = chain->use;
2538         list_for_each_entry(rule, &chain->rules, list) {
2539                 if (!nft_is_active_next(net, rule))
2540                         continue;
2541                 use--;
2542
2543                 err = nft_delrule(&ctx, rule);
2544                 if (err < 0)
2545                         return err;
2546         }
2547
2548         /* There are rules and elements that are still holding references to us,
2549          * we cannot do a recursive removal in this case.
2550          */
2551         if (use > 0) {
2552                 NL_SET_BAD_ATTR(extack, attr);
2553                 return -EBUSY;
2554         }
2555
2556         return nft_delchain(&ctx);
2557 }
2558
2559 /*
2560  * Expressions
2561  */
2562
2563 /**
2564  *      nft_register_expr - register nf_tables expr type
2565  *      @type: expr type
2566  *
2567  *      Registers the expr type for use with nf_tables. Returns zero on
2568  *      success or a negative errno code otherwise.
2569  */
2570 int nft_register_expr(struct nft_expr_type *type)
2571 {
2572         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2573         if (type->family == NFPROTO_UNSPEC)
2574                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2575         else
2576                 list_add_rcu(&type->list, &nf_tables_expressions);
2577         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2578         return 0;
2579 }
2580 EXPORT_SYMBOL_GPL(nft_register_expr);
2581
2582 /**
2583  *      nft_unregister_expr - unregister nf_tables expr type
2584  *      @type: expr type
2585  *
2586  *      Unregisters the expr typefor use with nf_tables.
2587  */
2588 void nft_unregister_expr(struct nft_expr_type *type)
2589 {
2590         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2591         list_del_rcu(&type->list);
2592         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2593 }
2594 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2595
2596 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2597                                                        struct nlattr *nla)
2598 {
2599         const struct nft_expr_type *type, *candidate = NULL;
2600
2601         list_for_each_entry(type, &nf_tables_expressions, list) {
2602                 if (!nla_strcmp(nla, type->name)) {
2603                         if (!type->family && !candidate)
2604                                 candidate = type;
2605                         else if (type->family == family)
2606                                 candidate = type;
2607                 }
2608         }
2609         return candidate;
2610 }
2611
2612 #ifdef CONFIG_MODULES
2613 static int nft_expr_type_request_module(struct net *net, u8 family,
2614                                         struct nlattr *nla)
2615 {
2616         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2617                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2618                 return -EAGAIN;
2619
2620         return 0;
2621 }
2622 #endif
2623
2624 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2625                                                      u8 family,
2626                                                      struct nlattr *nla)
2627 {
2628         const struct nft_expr_type *type;
2629
2630         if (nla == NULL)
2631                 return ERR_PTR(-EINVAL);
2632
2633         type = __nft_expr_type_get(family, nla);
2634         if (type != NULL && try_module_get(type->owner))
2635                 return type;
2636
2637         lockdep_nfnl_nft_mutex_not_held();
2638 #ifdef CONFIG_MODULES
2639         if (type == NULL) {
2640                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2641                         return ERR_PTR(-EAGAIN);
2642
2643                 if (nft_request_module(net, "nft-expr-%.*s",
2644                                        nla_len(nla),
2645                                        (char *)nla_data(nla)) == -EAGAIN)
2646                         return ERR_PTR(-EAGAIN);
2647         }
2648 #endif
2649         return ERR_PTR(-ENOENT);
2650 }
2651
2652 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2653         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2654                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2655         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2656 };
2657
2658 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2659                                     const struct nft_expr *expr)
2660 {
2661         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2662                 goto nla_put_failure;
2663
2664         if (expr->ops->dump) {
2665                 struct nlattr *data = nla_nest_start_noflag(skb,
2666                                                             NFTA_EXPR_DATA);
2667                 if (data == NULL)
2668                         goto nla_put_failure;
2669                 if (expr->ops->dump(skb, expr) < 0)
2670                         goto nla_put_failure;
2671                 nla_nest_end(skb, data);
2672         }
2673
2674         return skb->len;
2675
2676 nla_put_failure:
2677         return -1;
2678 };
2679
2680 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2681                   const struct nft_expr *expr)
2682 {
2683         struct nlattr *nest;
2684
2685         nest = nla_nest_start_noflag(skb, attr);
2686         if (!nest)
2687                 goto nla_put_failure;
2688         if (nf_tables_fill_expr_info(skb, expr) < 0)
2689                 goto nla_put_failure;
2690         nla_nest_end(skb, nest);
2691         return 0;
2692
2693 nla_put_failure:
2694         return -1;
2695 }
2696
2697 struct nft_expr_info {
2698         const struct nft_expr_ops       *ops;
2699         const struct nlattr             *attr;
2700         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2701 };
2702
2703 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2704                                 const struct nlattr *nla,
2705                                 struct nft_expr_info *info)
2706 {
2707         const struct nft_expr_type *type;
2708         const struct nft_expr_ops *ops;
2709         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2710         int err;
2711
2712         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2713                                           nft_expr_policy, NULL);
2714         if (err < 0)
2715                 return err;
2716
2717         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2718         if (IS_ERR(type))
2719                 return PTR_ERR(type);
2720
2721         if (tb[NFTA_EXPR_DATA]) {
2722                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2723                                                   tb[NFTA_EXPR_DATA],
2724                                                   type->policy, NULL);
2725                 if (err < 0)
2726                         goto err1;
2727         } else
2728                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2729
2730         if (type->select_ops != NULL) {
2731                 ops = type->select_ops(ctx,
2732                                        (const struct nlattr * const *)info->tb);
2733                 if (IS_ERR(ops)) {
2734                         err = PTR_ERR(ops);
2735 #ifdef CONFIG_MODULES
2736                         if (err == -EAGAIN)
2737                                 if (nft_expr_type_request_module(ctx->net,
2738                                                                  ctx->family,
2739                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2740                                         err = -ENOENT;
2741 #endif
2742                         goto err1;
2743                 }
2744         } else
2745                 ops = type->ops;
2746
2747         info->attr = nla;
2748         info->ops = ops;
2749
2750         return 0;
2751
2752 err1:
2753         module_put(type->owner);
2754         return err;
2755 }
2756
2757 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2758                              const struct nft_expr_info *expr_info,
2759                              struct nft_expr *expr)
2760 {
2761         const struct nft_expr_ops *ops = expr_info->ops;
2762         int err;
2763
2764         expr->ops = ops;
2765         if (ops->init) {
2766                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2767                 if (err < 0)
2768                         goto err1;
2769         }
2770
2771         return 0;
2772 err1:
2773         expr->ops = NULL;
2774         return err;
2775 }
2776
2777 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2778                                    struct nft_expr *expr)
2779 {
2780         const struct nft_expr_type *type = expr->ops->type;
2781
2782         if (expr->ops->destroy)
2783                 expr->ops->destroy(ctx, expr);
2784         module_put(type->owner);
2785 }
2786
2787 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2788                                       const struct nlattr *nla)
2789 {
2790         struct nft_expr_info expr_info;
2791         struct nft_expr *expr;
2792         struct module *owner;
2793         int err;
2794
2795         err = nf_tables_expr_parse(ctx, nla, &expr_info);
2796         if (err < 0)
2797                 goto err1;
2798
2799         err = -ENOMEM;
2800         expr = kzalloc(expr_info.ops->size, GFP_KERNEL);
2801         if (expr == NULL)
2802                 goto err2;
2803
2804         err = nf_tables_newexpr(ctx, &expr_info, expr);
2805         if (err < 0)
2806                 goto err3;
2807
2808         return expr;
2809 err3:
2810         kfree(expr);
2811 err2:
2812         owner = expr_info.ops->type->owner;
2813         if (expr_info.ops->type->release_ops)
2814                 expr_info.ops->type->release_ops(expr_info.ops);
2815
2816         module_put(owner);
2817 err1:
2818         return ERR_PTR(err);
2819 }
2820
2821 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2822 {
2823         int err;
2824
2825         if (src->ops->clone) {
2826                 dst->ops = src->ops;
2827                 err = src->ops->clone(dst, src);
2828                 if (err < 0)
2829                         return err;
2830         } else {
2831                 memcpy(dst, src, src->ops->size);
2832         }
2833
2834         __module_get(src->ops->type->owner);
2835
2836         return 0;
2837 }
2838
2839 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2840 {
2841         nf_tables_expr_destroy(ctx, expr);
2842         kfree(expr);
2843 }
2844
2845 /*
2846  * Rules
2847  */
2848
2849 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2850                                           u64 handle)
2851 {
2852         struct nft_rule *rule;
2853
2854         // FIXME: this sucks
2855         list_for_each_entry_rcu(rule, &chain->rules, list) {
2856                 if (handle == rule->handle)
2857                         return rule;
2858         }
2859
2860         return ERR_PTR(-ENOENT);
2861 }
2862
2863 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2864                                         const struct nlattr *nla)
2865 {
2866         if (nla == NULL)
2867                 return ERR_PTR(-EINVAL);
2868
2869         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2870 }
2871
2872 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2873         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
2874                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
2875         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
2876                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
2877         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
2878         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2879         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
2880         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
2881         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
2882                                     .len = NFT_USERDATA_MAXLEN },
2883         [NFTA_RULE_ID]          = { .type = NLA_U32 },
2884         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2885         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
2886 };
2887
2888 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2889                                     u32 portid, u32 seq, int event,
2890                                     u32 flags, int family,
2891                                     const struct nft_table *table,
2892                                     const struct nft_chain *chain,
2893                                     const struct nft_rule *rule, u64 handle)
2894 {
2895         struct nlmsghdr *nlh;
2896         const struct nft_expr *expr, *next;
2897         struct nlattr *list;
2898         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2899
2900         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
2901                            nft_base_seq(net));
2902         if (!nlh)
2903                 goto nla_put_failure;
2904
2905         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2906                 goto nla_put_failure;
2907         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2908                 goto nla_put_failure;
2909         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2910                          NFTA_RULE_PAD))
2911                 goto nla_put_failure;
2912
2913         if (event != NFT_MSG_DELRULE && handle) {
2914                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
2915                                  NFTA_RULE_PAD))
2916                         goto nla_put_failure;
2917         }
2918
2919         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2920                 nft_flow_rule_stats(chain, rule);
2921
2922         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2923         if (list == NULL)
2924                 goto nla_put_failure;
2925         nft_rule_for_each_expr(expr, next, rule) {
2926                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2927                         goto nla_put_failure;
2928         }
2929         nla_nest_end(skb, list);
2930
2931         if (rule->udata) {
2932                 struct nft_userdata *udata = nft_userdata(rule);
2933                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2934                             udata->data) < 0)
2935                         goto nla_put_failure;
2936         }
2937
2938         nlmsg_end(skb, nlh);
2939         return 0;
2940
2941 nla_put_failure:
2942         nlmsg_trim(skb, nlh);
2943         return -1;
2944 }
2945
2946 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2947                                   const struct nft_rule *rule, int event)
2948 {
2949         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2950         const struct nft_rule *prule;
2951         struct sk_buff *skb;
2952         u64 handle = 0;
2953         u16 flags = 0;
2954         int err;
2955
2956         if (!ctx->report &&
2957             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2958                 return;
2959
2960         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2961         if (skb == NULL)
2962                 goto err;
2963
2964         if (event == NFT_MSG_NEWRULE &&
2965             !list_is_first(&rule->list, &ctx->chain->rules) &&
2966             !list_is_last(&rule->list, &ctx->chain->rules)) {
2967                 prule = list_prev_entry(rule, list);
2968                 handle = prule->handle;
2969         }
2970         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
2971                 flags |= NLM_F_APPEND;
2972         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
2973                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
2974
2975         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2976                                        event, flags, ctx->family, ctx->table,
2977                                        ctx->chain, rule, handle);
2978         if (err < 0) {
2979                 kfree_skb(skb);
2980                 goto err;
2981         }
2982
2983         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
2984         return;
2985 err:
2986         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2987 }
2988
2989 struct nft_rule_dump_ctx {
2990         char *table;
2991         char *chain;
2992 };
2993
2994 static int __nf_tables_dump_rules(struct sk_buff *skb,
2995                                   unsigned int *idx,
2996                                   struct netlink_callback *cb,
2997                                   const struct nft_table *table,
2998                                   const struct nft_chain *chain)
2999 {
3000         struct net *net = sock_net(skb->sk);
3001         const struct nft_rule *rule, *prule;
3002         unsigned int s_idx = cb->args[0];
3003         u64 handle;
3004
3005         prule = NULL;
3006         list_for_each_entry_rcu(rule, &chain->rules, list) {
3007                 if (!nft_is_active(net, rule))
3008                         goto cont_skip;
3009                 if (*idx < s_idx)
3010                         goto cont;
3011                 if (*idx > s_idx) {
3012                         memset(&cb->args[1], 0,
3013                                         sizeof(cb->args) - sizeof(cb->args[0]));
3014                 }
3015                 if (prule)
3016                         handle = prule->handle;
3017                 else
3018                         handle = 0;
3019
3020                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3021                                         cb->nlh->nlmsg_seq,
3022                                         NFT_MSG_NEWRULE,
3023                                         NLM_F_MULTI | NLM_F_APPEND,
3024                                         table->family,
3025                                         table, chain, rule, handle) < 0)
3026                         return 1;
3027
3028                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3029 cont:
3030                 prule = rule;
3031 cont_skip:
3032                 (*idx)++;
3033         }
3034         return 0;
3035 }
3036
3037 static int nf_tables_dump_rules(struct sk_buff *skb,
3038                                 struct netlink_callback *cb)
3039 {
3040         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3041         const struct nft_rule_dump_ctx *ctx = cb->data;
3042         struct nft_table *table;
3043         const struct nft_chain *chain;
3044         unsigned int idx = 0;
3045         struct net *net = sock_net(skb->sk);
3046         int family = nfmsg->nfgen_family;
3047         struct nftables_pernet *nft_net;
3048
3049         rcu_read_lock();
3050         nft_net = nft_pernet(net);
3051         cb->seq = nft_net->base_seq;
3052
3053         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3054                 if (family != NFPROTO_UNSPEC && family != table->family)
3055                         continue;
3056
3057                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3058                         continue;
3059
3060                 if (ctx && ctx->table && ctx->chain) {
3061                         struct rhlist_head *list, *tmp;
3062
3063                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3064                                                nft_chain_ht_params);
3065                         if (!list)
3066                                 goto done;
3067
3068                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3069                                 if (!nft_is_active(net, chain))
3070                                         continue;
3071                                 __nf_tables_dump_rules(skb, &idx,
3072                                                        cb, table, chain);
3073                                 break;
3074                         }
3075                         goto done;
3076                 }
3077
3078                 list_for_each_entry_rcu(chain, &table->chains, list) {
3079                         if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
3080                                 goto done;
3081                 }
3082
3083                 if (ctx && ctx->table)
3084                         break;
3085         }
3086 done:
3087         rcu_read_unlock();
3088
3089         cb->args[0] = idx;
3090         return skb->len;
3091 }
3092
3093 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3094 {
3095         const struct nlattr * const *nla = cb->data;
3096         struct nft_rule_dump_ctx *ctx = NULL;
3097
3098         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3099                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3100                 if (!ctx)
3101                         return -ENOMEM;
3102
3103                 if (nla[NFTA_RULE_TABLE]) {
3104                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3105                                                         GFP_ATOMIC);
3106                         if (!ctx->table) {
3107                                 kfree(ctx);
3108                                 return -ENOMEM;
3109                         }
3110                 }
3111                 if (nla[NFTA_RULE_CHAIN]) {
3112                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3113                                                 GFP_ATOMIC);
3114                         if (!ctx->chain) {
3115                                 kfree(ctx->table);
3116                                 kfree(ctx);
3117                                 return -ENOMEM;
3118                         }
3119                 }
3120         }
3121
3122         cb->data = ctx;
3123         return 0;
3124 }
3125
3126 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3127 {
3128         struct nft_rule_dump_ctx *ctx = cb->data;
3129
3130         if (ctx) {
3131                 kfree(ctx->table);
3132                 kfree(ctx->chain);
3133                 kfree(ctx);
3134         }
3135         return 0;
3136 }
3137
3138 /* called with rcu_read_lock held */
3139 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3140                              const struct nlattr * const nla[])
3141 {
3142         struct netlink_ext_ack *extack = info->extack;
3143         u8 genmask = nft_genmask_cur(info->net);
3144         u8 family = info->nfmsg->nfgen_family;
3145         const struct nft_chain *chain;
3146         const struct nft_rule *rule;
3147         struct net *net = info->net;
3148         struct nft_table *table;
3149         struct sk_buff *skb2;
3150         int err;
3151
3152         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3153                 struct netlink_dump_control c = {
3154                         .start= nf_tables_dump_rules_start,
3155                         .dump = nf_tables_dump_rules,
3156                         .done = nf_tables_dump_rules_done,
3157                         .module = THIS_MODULE,
3158                         .data = (void *)nla,
3159                 };
3160
3161                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3162         }
3163
3164         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3165         if (IS_ERR(table)) {
3166                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3167                 return PTR_ERR(table);
3168         }
3169
3170         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3171         if (IS_ERR(chain)) {
3172                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3173                 return PTR_ERR(chain);
3174         }
3175
3176         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3177         if (IS_ERR(rule)) {
3178                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3179                 return PTR_ERR(rule);
3180         }
3181
3182         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3183         if (!skb2)
3184                 return -ENOMEM;
3185
3186         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3187                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3188                                        family, table, chain, rule, 0);
3189         if (err < 0)
3190                 goto err_fill_rule_info;
3191
3192         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3193
3194 err_fill_rule_info:
3195         kfree_skb(skb2);
3196         return err;
3197 }
3198
3199 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3200                                    struct nft_rule *rule)
3201 {
3202         struct nft_expr *expr, *next;
3203
3204         /*
3205          * Careful: some expressions might not be initialized in case this
3206          * is called on error from nf_tables_newrule().
3207          */
3208         expr = nft_expr_first(rule);
3209         while (nft_expr_more(rule, expr)) {
3210                 next = nft_expr_next(expr);
3211                 nf_tables_expr_destroy(ctx, expr);
3212                 expr = next;
3213         }
3214         kfree(rule);
3215 }
3216
3217 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3218 {
3219         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3220         nf_tables_rule_destroy(ctx, rule);
3221 }
3222
3223 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3224 {
3225         struct nft_expr *expr, *last;
3226         const struct nft_data *data;
3227         struct nft_rule *rule;
3228         int err;
3229
3230         if (ctx->level == NFT_JUMP_STACK_SIZE)
3231                 return -EMLINK;
3232
3233         list_for_each_entry(rule, &chain->rules, list) {
3234                 if (!nft_is_active_next(ctx->net, rule))
3235                         continue;
3236
3237                 nft_rule_for_each_expr(expr, last, rule) {
3238                         if (!expr->ops->validate)
3239                                 continue;
3240
3241                         err = expr->ops->validate(ctx, expr, &data);
3242                         if (err < 0)
3243                                 return err;
3244                 }
3245         }
3246
3247         return 0;
3248 }
3249 EXPORT_SYMBOL_GPL(nft_chain_validate);
3250
3251 static int nft_table_validate(struct net *net, const struct nft_table *table)
3252 {
3253         struct nft_chain *chain;
3254         struct nft_ctx ctx = {
3255                 .net    = net,
3256                 .family = table->family,
3257         };
3258         int err;
3259
3260         list_for_each_entry(chain, &table->chains, list) {
3261                 if (!nft_is_base_chain(chain))
3262                         continue;
3263
3264                 ctx.chain = chain;
3265                 err = nft_chain_validate(&ctx, chain);
3266                 if (err < 0)
3267                         return err;
3268         }
3269
3270         return 0;
3271 }
3272
3273 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3274                                              const struct nlattr *nla);
3275
3276 #define NFT_RULE_MAXEXPRS       128
3277
3278 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3279                              const struct nlattr * const nla[])
3280 {
3281         struct nftables_pernet *nft_net = nft_pernet(info->net);
3282         struct netlink_ext_ack *extack = info->extack;
3283         unsigned int size, i, n, ulen = 0, usize = 0;
3284         u8 genmask = nft_genmask_next(info->net);
3285         struct nft_rule *rule, *old_rule = NULL;
3286         struct nft_expr_info *expr_info = NULL;
3287         u8 family = info->nfmsg->nfgen_family;
3288         struct nft_flow_rule *flow = NULL;
3289         struct net *net = info->net;
3290         struct nft_userdata *udata;
3291         struct nft_table *table;
3292         struct nft_chain *chain;
3293         struct nft_trans *trans;
3294         u64 handle, pos_handle;
3295         struct nft_expr *expr;
3296         struct nft_ctx ctx;
3297         struct nlattr *tmp;
3298         int err, rem;
3299
3300         lockdep_assert_held(&nft_net->commit_mutex);
3301
3302         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3303                                  NETLINK_CB(skb).portid);
3304         if (IS_ERR(table)) {
3305                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3306                 return PTR_ERR(table);
3307         }
3308
3309         if (nla[NFTA_RULE_CHAIN]) {
3310                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3311                                          genmask);
3312                 if (IS_ERR(chain)) {
3313                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3314                         return PTR_ERR(chain);
3315                 }
3316                 if (nft_chain_is_bound(chain))
3317                         return -EOPNOTSUPP;
3318
3319         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3320                 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3321                 if (IS_ERR(chain)) {
3322                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3323                         return PTR_ERR(chain);
3324                 }
3325         } else {
3326                 return -EINVAL;
3327         }
3328
3329         if (nla[NFTA_RULE_HANDLE]) {
3330                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3331                 rule = __nft_rule_lookup(chain, handle);
3332                 if (IS_ERR(rule)) {
3333                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3334                         return PTR_ERR(rule);
3335                 }
3336
3337                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3338                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3339                         return -EEXIST;
3340                 }
3341                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3342                         old_rule = rule;
3343                 else
3344                         return -EOPNOTSUPP;
3345         } else {
3346                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3347                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3348                         return -EINVAL;
3349                 handle = nf_tables_alloc_handle(table);
3350
3351                 if (chain->use == UINT_MAX)
3352                         return -EOVERFLOW;
3353
3354                 if (nla[NFTA_RULE_POSITION]) {
3355                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3356                         old_rule = __nft_rule_lookup(chain, pos_handle);
3357                         if (IS_ERR(old_rule)) {
3358                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3359                                 return PTR_ERR(old_rule);
3360                         }
3361                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3362                         old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3363                         if (IS_ERR(old_rule)) {
3364                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3365                                 return PTR_ERR(old_rule);
3366                         }
3367                 }
3368         }
3369
3370         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3371
3372         n = 0;
3373         size = 0;
3374         if (nla[NFTA_RULE_EXPRESSIONS]) {
3375                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3376                                            sizeof(struct nft_expr_info),
3377                                            GFP_KERNEL);
3378                 if (!expr_info)
3379                         return -ENOMEM;
3380
3381                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3382                         err = -EINVAL;
3383                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3384                                 goto err_release_expr;
3385                         if (n == NFT_RULE_MAXEXPRS)
3386                                 goto err_release_expr;
3387                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3388                         if (err < 0) {
3389                                 NL_SET_BAD_ATTR(extack, tmp);
3390                                 goto err_release_expr;
3391                         }
3392                         size += expr_info[n].ops->size;
3393                         n++;
3394                 }
3395         }
3396         /* Check for overflow of dlen field */
3397         err = -EFBIG;
3398         if (size >= 1 << 12)
3399                 goto err_release_expr;
3400
3401         if (nla[NFTA_RULE_USERDATA]) {
3402                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3403                 if (ulen > 0)
3404                         usize = sizeof(struct nft_userdata) + ulen;
3405         }
3406
3407         err = -ENOMEM;
3408         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3409         if (rule == NULL)
3410                 goto err_release_expr;
3411
3412         nft_activate_next(net, rule);
3413
3414         rule->handle = handle;
3415         rule->dlen   = size;
3416         rule->udata  = ulen ? 1 : 0;
3417
3418         if (ulen) {
3419                 udata = nft_userdata(rule);
3420                 udata->len = ulen - 1;
3421                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3422         }
3423
3424         expr = nft_expr_first(rule);
3425         for (i = 0; i < n; i++) {
3426                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3427                 if (err < 0) {
3428                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3429                         goto err_release_rule;
3430                 }
3431
3432                 if (expr_info[i].ops->validate)
3433                         nft_validate_state_update(net, NFT_VALIDATE_NEED);
3434
3435                 expr_info[i].ops = NULL;
3436                 expr = nft_expr_next(expr);
3437         }
3438
3439         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3440                 flow = nft_flow_rule_create(net, rule);
3441                 if (IS_ERR(flow)) {
3442                         err = PTR_ERR(flow);
3443                         goto err_release_rule;
3444                 }
3445         }
3446
3447         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3448                 err = nft_delrule(&ctx, old_rule);
3449                 if (err < 0)
3450                         goto err_destroy_flow_rule;
3451
3452                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3453                 if (trans == NULL) {
3454                         err = -ENOMEM;
3455                         goto err_destroy_flow_rule;
3456                 }
3457                 list_add_tail_rcu(&rule->list, &old_rule->list);
3458         } else {
3459                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3460                 if (!trans) {
3461                         err = -ENOMEM;
3462                         goto err_destroy_flow_rule;
3463                 }
3464
3465                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3466                         if (old_rule)
3467                                 list_add_rcu(&rule->list, &old_rule->list);
3468                         else
3469                                 list_add_tail_rcu(&rule->list, &chain->rules);
3470                  } else {
3471                         if (old_rule)
3472                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3473                         else
3474                                 list_add_rcu(&rule->list, &chain->rules);
3475                 }
3476         }
3477         kvfree(expr_info);
3478         chain->use++;
3479
3480         if (flow)
3481                 nft_trans_flow_rule(trans) = flow;
3482
3483         if (nft_net->validate_state == NFT_VALIDATE_DO)
3484                 return nft_table_validate(net, table);
3485
3486         return 0;
3487
3488 err_destroy_flow_rule:
3489         if (flow)
3490                 nft_flow_rule_destroy(flow);
3491 err_release_rule:
3492         nf_tables_rule_release(&ctx, rule);
3493 err_release_expr:
3494         for (i = 0; i < n; i++) {
3495                 if (expr_info[i].ops) {
3496                         module_put(expr_info[i].ops->type->owner);
3497                         if (expr_info[i].ops->type->release_ops)
3498                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3499                 }
3500         }
3501         kvfree(expr_info);
3502
3503         return err;
3504 }
3505
3506 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3507                                              const struct nlattr *nla)
3508 {
3509         struct nftables_pernet *nft_net = nft_pernet(net);
3510         u32 id = ntohl(nla_get_be32(nla));
3511         struct nft_trans *trans;
3512
3513         list_for_each_entry(trans, &nft_net->commit_list, list) {
3514                 struct nft_rule *rule = nft_trans_rule(trans);
3515
3516                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3517                     id == nft_trans_rule_id(trans))
3518                         return rule;
3519         }
3520         return ERR_PTR(-ENOENT);
3521 }
3522
3523 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3524                              const struct nlattr * const nla[])
3525 {
3526         struct netlink_ext_ack *extack = info->extack;
3527         u8 genmask = nft_genmask_next(info->net);
3528         u8 family = info->nfmsg->nfgen_family;
3529         struct nft_chain *chain = NULL;
3530         struct net *net = info->net;
3531         struct nft_table *table;
3532         struct nft_rule *rule;
3533         struct nft_ctx ctx;
3534         int err = 0;
3535
3536         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3537                                  NETLINK_CB(skb).portid);
3538         if (IS_ERR(table)) {
3539                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3540                 return PTR_ERR(table);
3541         }
3542
3543         if (nla[NFTA_RULE_CHAIN]) {
3544                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3545                                          genmask);
3546                 if (IS_ERR(chain)) {
3547                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3548                         return PTR_ERR(chain);
3549                 }
3550                 if (nft_chain_is_bound(chain))
3551                         return -EOPNOTSUPP;
3552         }
3553
3554         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3555
3556         if (chain) {
3557                 if (nla[NFTA_RULE_HANDLE]) {
3558                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3559                         if (IS_ERR(rule)) {
3560                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3561                                 return PTR_ERR(rule);
3562                         }
3563
3564                         err = nft_delrule(&ctx, rule);
3565                 } else if (nla[NFTA_RULE_ID]) {
3566                         rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3567                         if (IS_ERR(rule)) {
3568                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3569                                 return PTR_ERR(rule);
3570                         }
3571
3572                         err = nft_delrule(&ctx, rule);
3573                 } else {
3574                         err = nft_delrule_by_chain(&ctx);
3575                 }
3576         } else {
3577                 list_for_each_entry(chain, &table->chains, list) {
3578                         if (!nft_is_active_next(net, chain))
3579                                 continue;
3580
3581                         ctx.chain = chain;
3582                         err = nft_delrule_by_chain(&ctx);
3583                         if (err < 0)
3584                                 break;
3585                 }
3586         }
3587
3588         return err;
3589 }
3590
3591 /*
3592  * Sets
3593  */
3594 static const struct nft_set_type *nft_set_types[] = {
3595         &nft_set_hash_fast_type,
3596         &nft_set_hash_type,
3597         &nft_set_rhash_type,
3598         &nft_set_bitmap_type,
3599         &nft_set_rbtree_type,
3600 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3601         &nft_set_pipapo_avx2_type,
3602 #endif
3603         &nft_set_pipapo_type,
3604 };
3605
3606 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3607                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3608                                  NFT_SET_EVAL)
3609
3610 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3611 {
3612         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3613 }
3614
3615 /*
3616  * Select a set implementation based on the data characteristics and the
3617  * given policy. The total memory use might not be known if no size is
3618  * given, in that case the amount of memory per element is used.
3619  */
3620 static const struct nft_set_ops *
3621 nft_select_set_ops(const struct nft_ctx *ctx,
3622                    const struct nlattr * const nla[],
3623                    const struct nft_set_desc *desc,
3624                    enum nft_set_policies policy)
3625 {
3626         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3627         const struct nft_set_ops *ops, *bops;
3628         struct nft_set_estimate est, best;
3629         const struct nft_set_type *type;
3630         u32 flags = 0;
3631         int i;
3632
3633         lockdep_assert_held(&nft_net->commit_mutex);
3634         lockdep_nfnl_nft_mutex_not_held();
3635
3636         if (nla[NFTA_SET_FLAGS] != NULL)
3637                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3638
3639         bops        = NULL;
3640         best.size   = ~0;
3641         best.lookup = ~0;
3642         best.space  = ~0;
3643
3644         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3645                 type = nft_set_types[i];
3646                 ops = &type->ops;
3647
3648                 if (!nft_set_ops_candidate(type, flags))
3649                         continue;
3650                 if (!ops->estimate(desc, flags, &est))
3651                         continue;
3652
3653                 switch (policy) {
3654                 case NFT_SET_POL_PERFORMANCE:
3655                         if (est.lookup < best.lookup)
3656                                 break;
3657                         if (est.lookup == best.lookup &&
3658                             est.space < best.space)
3659                                 break;
3660                         continue;
3661                 case NFT_SET_POL_MEMORY:
3662                         if (!desc->size) {
3663                                 if (est.space < best.space)
3664                                         break;
3665                                 if (est.space == best.space &&
3666                                     est.lookup < best.lookup)
3667                                         break;
3668                         } else if (est.size < best.size || !bops) {
3669                                 break;
3670                         }
3671                         continue;
3672                 default:
3673                         break;
3674                 }
3675
3676                 bops = ops;
3677                 best = est;
3678         }
3679
3680         if (bops != NULL)
3681                 return bops;
3682
3683         return ERR_PTR(-EOPNOTSUPP);
3684 }
3685
3686 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3687         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3688                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3689         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3690                                             .len = NFT_SET_MAXNAMELEN - 1 },
3691         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3692         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3693         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3694         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3695         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3696         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3697         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3698         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3699         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3700         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3701         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3702                                             .len  = NFT_USERDATA_MAXLEN },
3703         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3704         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3705         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3706         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
3707 };
3708
3709 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3710         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3711         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3712 };
3713
3714 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3715                                       const struct nlattr *nla, u8 genmask)
3716 {
3717         struct nft_set *set;
3718
3719         if (nla == NULL)
3720                 return ERR_PTR(-EINVAL);
3721
3722         list_for_each_entry_rcu(set, &table->sets, list) {
3723                 if (!nla_strcmp(nla, set->name) &&
3724                     nft_active_genmask(set, genmask))
3725                         return set;
3726         }
3727         return ERR_PTR(-ENOENT);
3728 }
3729
3730 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3731                                                const struct nlattr *nla,
3732                                                u8 genmask)
3733 {
3734         struct nft_set *set;
3735
3736         list_for_each_entry(set, &table->sets, list) {
3737                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3738                     nft_active_genmask(set, genmask))
3739                         return set;
3740         }
3741         return ERR_PTR(-ENOENT);
3742 }
3743
3744 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3745                                            const struct nlattr *nla, u8 genmask)
3746 {
3747         struct nftables_pernet *nft_net = nft_pernet(net);
3748         u32 id = ntohl(nla_get_be32(nla));
3749         struct nft_trans *trans;
3750
3751         list_for_each_entry(trans, &nft_net->commit_list, list) {
3752                 if (trans->msg_type == NFT_MSG_NEWSET) {
3753                         struct nft_set *set = nft_trans_set(trans);
3754
3755                         if (id == nft_trans_set_id(trans) &&
3756                             nft_active_genmask(set, genmask))
3757                                 return set;
3758                 }
3759         }
3760         return ERR_PTR(-ENOENT);
3761 }
3762
3763 struct nft_set *nft_set_lookup_global(const struct net *net,
3764                                       const struct nft_table *table,
3765                                       const struct nlattr *nla_set_name,
3766                                       const struct nlattr *nla_set_id,
3767                                       u8 genmask)
3768 {
3769         struct nft_set *set;
3770
3771         set = nft_set_lookup(table, nla_set_name, genmask);
3772         if (IS_ERR(set)) {
3773                 if (!nla_set_id)
3774                         return set;
3775
3776                 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3777         }
3778         return set;
3779 }
3780 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3781
3782 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3783                                     const char *name)
3784 {
3785         const struct nft_set *i;
3786         const char *p;
3787         unsigned long *inuse;
3788         unsigned int n = 0, min = 0;
3789
3790         p = strchr(name, '%');
3791         if (p != NULL) {
3792                 if (p[1] != 'd' || strchr(p + 2, '%'))
3793                         return -EINVAL;
3794
3795                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3796                 if (inuse == NULL)
3797                         return -ENOMEM;
3798 cont:
3799                 list_for_each_entry(i, &ctx->table->sets, list) {
3800                         int tmp;
3801
3802                         if (!nft_is_active_next(ctx->net, set))
3803                                 continue;
3804                         if (!sscanf(i->name, name, &tmp))
3805                                 continue;
3806                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3807                                 continue;
3808
3809                         set_bit(tmp - min, inuse);
3810                 }
3811
3812                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3813                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3814                         min += BITS_PER_BYTE * PAGE_SIZE;
3815                         memset(inuse, 0, PAGE_SIZE);
3816                         goto cont;
3817                 }
3818                 free_page((unsigned long)inuse);
3819         }
3820
3821         set->name = kasprintf(GFP_KERNEL, name, min + n);
3822         if (!set->name)
3823                 return -ENOMEM;
3824
3825         list_for_each_entry(i, &ctx->table->sets, list) {
3826                 if (!nft_is_active_next(ctx->net, i))
3827                         continue;
3828                 if (!strcmp(set->name, i->name)) {
3829                         kfree(set->name);
3830                         set->name = NULL;
3831                         return -ENFILE;
3832                 }
3833         }
3834         return 0;
3835 }
3836
3837 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3838 {
3839         u64 ms = be64_to_cpu(nla_get_be64(nla));
3840         u64 max = (u64)(~((u64)0));
3841
3842         max = div_u64(max, NSEC_PER_MSEC);
3843         if (ms >= max)
3844                 return -ERANGE;
3845
3846         ms *= NSEC_PER_MSEC;
3847         *result = nsecs_to_jiffies64(ms);
3848         return 0;
3849 }
3850
3851 __be64 nf_jiffies64_to_msecs(u64 input)
3852 {
3853         return cpu_to_be64(jiffies64_to_msecs(input));
3854 }
3855
3856 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3857                                      const struct nft_set *set)
3858 {
3859         struct nlattr *concat, *field;
3860         int i;
3861
3862         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3863         if (!concat)
3864                 return -ENOMEM;
3865
3866         for (i = 0; i < set->field_count; i++) {
3867                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3868                 if (!field)
3869                         return -ENOMEM;
3870
3871                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3872                                  htonl(set->field_len[i])))
3873                         return -ENOMEM;
3874
3875                 nla_nest_end(skb, field);
3876         }
3877
3878         nla_nest_end(skb, concat);
3879
3880         return 0;
3881 }
3882
3883 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3884                               const struct nft_set *set, u16 event, u16 flags)
3885 {
3886         struct nlmsghdr *nlh;
3887         u32 portid = ctx->portid;
3888         struct nlattr *nest;
3889         u32 seq = ctx->seq;
3890         int i;
3891
3892         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3893         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
3894                            NFNETLINK_V0, nft_base_seq(ctx->net));
3895         if (!nlh)
3896                 goto nla_put_failure;
3897
3898         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3899                 goto nla_put_failure;
3900         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3901                 goto nla_put_failure;
3902         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3903                          NFTA_SET_PAD))
3904                 goto nla_put_failure;
3905         if (set->flags != 0)
3906                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3907                         goto nla_put_failure;
3908
3909         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3910                 goto nla_put_failure;
3911         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3912                 goto nla_put_failure;
3913         if (set->flags & NFT_SET_MAP) {
3914                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3915                         goto nla_put_failure;
3916                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3917                         goto nla_put_failure;
3918         }
3919         if (set->flags & NFT_SET_OBJECT &&
3920             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3921                 goto nla_put_failure;
3922
3923         if (set->timeout &&
3924             nla_put_be64(skb, NFTA_SET_TIMEOUT,
3925                          nf_jiffies64_to_msecs(set->timeout),
3926                          NFTA_SET_PAD))
3927                 goto nla_put_failure;
3928         if (set->gc_int &&
3929             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3930                 goto nla_put_failure;
3931
3932         if (set->policy != NFT_SET_POL_PERFORMANCE) {
3933                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3934                         goto nla_put_failure;
3935         }
3936
3937         if (set->udata &&
3938             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3939                 goto nla_put_failure;
3940
3941         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3942         if (!nest)
3943                 goto nla_put_failure;
3944         if (set->size &&
3945             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3946                 goto nla_put_failure;
3947
3948         if (set->field_count > 1 &&
3949             nf_tables_fill_set_concat(skb, set))
3950                 goto nla_put_failure;
3951
3952         nla_nest_end(skb, nest);
3953
3954         if (set->num_exprs == 1) {
3955                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3956                 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
3957                         goto nla_put_failure;
3958
3959                 nla_nest_end(skb, nest);
3960         } else if (set->num_exprs > 1) {
3961                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
3962                 if (nest == NULL)
3963                         goto nla_put_failure;
3964
3965                 for (i = 0; i < set->num_exprs; i++) {
3966                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
3967                                           set->exprs[i]) < 0)
3968                                 goto nla_put_failure;
3969                 }
3970                 nla_nest_end(skb, nest);
3971         }
3972
3973         nlmsg_end(skb, nlh);
3974         return 0;
3975
3976 nla_put_failure:
3977         nlmsg_trim(skb, nlh);
3978         return -1;
3979 }
3980
3981 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3982                                  const struct nft_set *set, int event,
3983                                  gfp_t gfp_flags)
3984 {
3985         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3986         u32 portid = ctx->portid;
3987         struct sk_buff *skb;
3988         u16 flags = 0;
3989         int err;
3990
3991         if (!ctx->report &&
3992             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3993                 return;
3994
3995         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3996         if (skb == NULL)
3997                 goto err;
3998
3999         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4000                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4001
4002         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4003         if (err < 0) {
4004                 kfree_skb(skb);
4005                 goto err;
4006         }
4007
4008         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4009         return;
4010 err:
4011         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4012 }
4013
4014 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4015 {
4016         const struct nft_set *set;
4017         unsigned int idx, s_idx = cb->args[0];
4018         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4019         struct net *net = sock_net(skb->sk);
4020         struct nft_ctx *ctx = cb->data, ctx_set;
4021         struct nftables_pernet *nft_net;
4022
4023         if (cb->args[1])
4024                 return skb->len;
4025
4026         rcu_read_lock();
4027         nft_net = nft_pernet(net);
4028         cb->seq = nft_net->base_seq;
4029
4030         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4031                 if (ctx->family != NFPROTO_UNSPEC &&
4032                     ctx->family != table->family)
4033                         continue;
4034
4035                 if (ctx->table && ctx->table != table)
4036                         continue;
4037
4038                 if (cur_table) {
4039                         if (cur_table != table)
4040                                 continue;
4041
4042                         cur_table = NULL;
4043                 }
4044                 idx = 0;
4045                 list_for_each_entry_rcu(set, &table->sets, list) {
4046                         if (idx < s_idx)
4047                                 goto cont;
4048                         if (!nft_is_active(net, set))
4049                                 goto cont;
4050
4051                         ctx_set = *ctx;
4052                         ctx_set.table = table;
4053                         ctx_set.family = table->family;
4054
4055                         if (nf_tables_fill_set(skb, &ctx_set, set,
4056                                                NFT_MSG_NEWSET,
4057                                                NLM_F_MULTI) < 0) {
4058                                 cb->args[0] = idx;
4059                                 cb->args[2] = (unsigned long) table;
4060                                 goto done;
4061                         }
4062                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4063 cont:
4064                         idx++;
4065                 }
4066                 if (s_idx)
4067                         s_idx = 0;
4068         }
4069         cb->args[1] = 1;
4070 done:
4071         rcu_read_unlock();
4072         return skb->len;
4073 }
4074
4075 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4076 {
4077         struct nft_ctx *ctx_dump = NULL;
4078
4079         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4080         if (ctx_dump == NULL)
4081                 return -ENOMEM;
4082
4083         cb->data = ctx_dump;
4084         return 0;
4085 }
4086
4087 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4088 {
4089         kfree(cb->data);
4090         return 0;
4091 }
4092
4093 /* called with rcu_read_lock held */
4094 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4095                             const struct nlattr * const nla[])
4096 {
4097         struct netlink_ext_ack *extack = info->extack;
4098         u8 genmask = nft_genmask_cur(info->net);
4099         u8 family = info->nfmsg->nfgen_family;
4100         struct nft_table *table = NULL;
4101         struct net *net = info->net;
4102         const struct nft_set *set;
4103         struct sk_buff *skb2;
4104         struct nft_ctx ctx;
4105         int err;
4106
4107         if (nla[NFTA_SET_TABLE]) {
4108                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4109                                          genmask, 0);
4110                 if (IS_ERR(table)) {
4111                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4112                         return PTR_ERR(table);
4113                 }
4114         }
4115
4116         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4117
4118         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4119                 struct netlink_dump_control c = {
4120                         .start = nf_tables_dump_sets_start,
4121                         .dump = nf_tables_dump_sets,
4122                         .done = nf_tables_dump_sets_done,
4123                         .data = &ctx,
4124                         .module = THIS_MODULE,
4125                 };
4126
4127                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4128         }
4129
4130         /* Only accept unspec with dump */
4131         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4132                 return -EAFNOSUPPORT;
4133         if (!nla[NFTA_SET_TABLE])
4134                 return -EINVAL;
4135
4136         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4137         if (IS_ERR(set))
4138                 return PTR_ERR(set);
4139
4140         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4141         if (skb2 == NULL)
4142                 return -ENOMEM;
4143
4144         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4145         if (err < 0)
4146                 goto err_fill_set_info;
4147
4148         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4149
4150 err_fill_set_info:
4151         kfree_skb(skb2);
4152         return err;
4153 }
4154
4155 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4156         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4157 };
4158
4159 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4160                                      struct nft_set_desc *desc)
4161 {
4162         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4163         u32 len;
4164         int err;
4165
4166         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4167                                           nft_concat_policy, NULL);
4168         if (err < 0)
4169                 return err;
4170
4171         if (!tb[NFTA_SET_FIELD_LEN])
4172                 return -EINVAL;
4173
4174         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4175
4176         if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
4177                 return -E2BIG;
4178
4179         desc->field_len[desc->field_count++] = len;
4180
4181         return 0;
4182 }
4183
4184 static int nft_set_desc_concat(struct nft_set_desc *desc,
4185                                const struct nlattr *nla)
4186 {
4187         struct nlattr *attr;
4188         int rem, err;
4189
4190         nla_for_each_nested(attr, nla, rem) {
4191                 if (nla_type(attr) != NFTA_LIST_ELEM)
4192                         return -EINVAL;
4193
4194                 err = nft_set_desc_concat_parse(attr, desc);
4195                 if (err < 0)
4196                         return err;
4197         }
4198
4199         return 0;
4200 }
4201
4202 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4203                                     const struct nlattr *nla)
4204 {
4205         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4206         int err;
4207
4208         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4209                                           nft_set_desc_policy, NULL);
4210         if (err < 0)
4211                 return err;
4212
4213         if (da[NFTA_SET_DESC_SIZE] != NULL)
4214                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4215         if (da[NFTA_SET_DESC_CONCAT])
4216                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4217
4218         return err;
4219 }
4220
4221 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4222                             const struct nlattr * const nla[])
4223 {
4224         u32 ktype, dtype, flags, policy, gc_int, objtype;
4225         struct netlink_ext_ack *extack = info->extack;
4226         u8 genmask = nft_genmask_next(info->net);
4227         u8 family = info->nfmsg->nfgen_family;
4228         const struct nft_set_ops *ops;
4229         struct nft_expr *expr = NULL;
4230         struct net *net = info->net;
4231         struct nft_set_desc desc;
4232         struct nft_table *table;
4233         unsigned char *udata;
4234         struct nft_set *set;
4235         struct nft_ctx ctx;
4236         size_t alloc_size;
4237         u64 timeout;
4238         char *name;
4239         int err, i;
4240         u16 udlen;
4241         u64 size;
4242
4243         if (nla[NFTA_SET_TABLE] == NULL ||
4244             nla[NFTA_SET_NAME] == NULL ||
4245             nla[NFTA_SET_KEY_LEN] == NULL ||
4246             nla[NFTA_SET_ID] == NULL)
4247                 return -EINVAL;
4248
4249         memset(&desc, 0, sizeof(desc));
4250
4251         ktype = NFT_DATA_VALUE;
4252         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4253                 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4254                 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4255                         return -EINVAL;
4256         }
4257
4258         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4259         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4260                 return -EINVAL;
4261
4262         flags = 0;
4263         if (nla[NFTA_SET_FLAGS] != NULL) {
4264                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4265                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4266                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4267                               NFT_SET_MAP | NFT_SET_EVAL |
4268                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4269                         return -EOPNOTSUPP;
4270                 /* Only one of these operations is supported */
4271                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4272                              (NFT_SET_MAP | NFT_SET_OBJECT))
4273                         return -EOPNOTSUPP;
4274                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4275                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4276                         return -EOPNOTSUPP;
4277         }
4278
4279         dtype = 0;
4280         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4281                 if (!(flags & NFT_SET_MAP))
4282                         return -EINVAL;
4283
4284                 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4285                 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4286                     dtype != NFT_DATA_VERDICT)
4287                         return -EINVAL;
4288
4289                 if (dtype != NFT_DATA_VERDICT) {
4290                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4291                                 return -EINVAL;
4292                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4293                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4294                                 return -EINVAL;
4295                 } else
4296                         desc.dlen = sizeof(struct nft_verdict);
4297         } else if (flags & NFT_SET_MAP)
4298                 return -EINVAL;
4299
4300         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4301                 if (!(flags & NFT_SET_OBJECT))
4302                         return -EINVAL;
4303
4304                 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4305                 if (objtype == NFT_OBJECT_UNSPEC ||
4306                     objtype > NFT_OBJECT_MAX)
4307                         return -EOPNOTSUPP;
4308         } else if (flags & NFT_SET_OBJECT)
4309                 return -EINVAL;
4310         else
4311                 objtype = NFT_OBJECT_UNSPEC;
4312
4313         timeout = 0;
4314         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4315                 if (!(flags & NFT_SET_TIMEOUT))
4316                         return -EINVAL;
4317
4318                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4319                 if (err)
4320                         return err;
4321         }
4322         gc_int = 0;
4323         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4324                 if (!(flags & NFT_SET_TIMEOUT))
4325                         return -EINVAL;
4326                 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4327         }
4328
4329         policy = NFT_SET_POL_PERFORMANCE;
4330         if (nla[NFTA_SET_POLICY] != NULL)
4331                 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4332
4333         if (nla[NFTA_SET_DESC] != NULL) {
4334                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4335                 if (err < 0)
4336                         return err;
4337         }
4338
4339         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4340                 desc.expr = true;
4341
4342         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4343                                  NETLINK_CB(skb).portid);
4344         if (IS_ERR(table)) {
4345                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4346                 return PTR_ERR(table);
4347         }
4348
4349         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4350
4351         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4352         if (IS_ERR(set)) {
4353                 if (PTR_ERR(set) != -ENOENT) {
4354                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4355                         return PTR_ERR(set);
4356                 }
4357         } else {
4358                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4359                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4360                         return -EEXIST;
4361                 }
4362                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4363                         return -EOPNOTSUPP;
4364
4365                 return 0;
4366         }
4367
4368         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4369                 return -ENOENT;
4370
4371         ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4372         if (IS_ERR(ops))
4373                 return PTR_ERR(ops);
4374
4375         udlen = 0;
4376         if (nla[NFTA_SET_USERDATA])
4377                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4378
4379         size = 0;
4380         if (ops->privsize != NULL)
4381                 size = ops->privsize(nla, &desc);
4382         alloc_size = sizeof(*set) + size + udlen;
4383         if (alloc_size < size || alloc_size > INT_MAX)
4384                 return -ENOMEM;
4385         set = kvzalloc(alloc_size, GFP_KERNEL);
4386         if (!set)
4387                 return -ENOMEM;
4388
4389         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4390         if (!name) {
4391                 err = -ENOMEM;
4392                 goto err_set_name;
4393         }
4394
4395         err = nf_tables_set_alloc_name(&ctx, set, name);
4396         kfree(name);
4397         if (err < 0)
4398                 goto err_set_name;
4399
4400         udata = NULL;
4401         if (udlen) {
4402                 udata = set->data + size;
4403                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4404         }
4405
4406         INIT_LIST_HEAD(&set->bindings);
4407         INIT_LIST_HEAD(&set->catchall_list);
4408         set->table = table;
4409         write_pnet(&set->net, net);
4410         set->ops = ops;
4411         set->ktype = ktype;
4412         set->klen = desc.klen;
4413         set->dtype = dtype;
4414         set->objtype = objtype;
4415         set->dlen = desc.dlen;
4416         set->flags = flags;
4417         set->size = desc.size;
4418         set->policy = policy;
4419         set->udlen = udlen;
4420         set->udata = udata;
4421         set->timeout = timeout;
4422         set->gc_int = gc_int;
4423
4424         set->field_count = desc.field_count;
4425         for (i = 0; i < desc.field_count; i++)
4426                 set->field_len[i] = desc.field_len[i];
4427
4428         err = ops->init(set, &desc, nla);
4429         if (err < 0)
4430                 goto err_set_init;
4431
4432         if (nla[NFTA_SET_EXPR]) {
4433                 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4434                 if (IS_ERR(expr)) {
4435                         err = PTR_ERR(expr);
4436                         goto err_set_expr_alloc;
4437                 }
4438                 set->exprs[0] = expr;
4439                 set->num_exprs++;
4440         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4441                 struct nft_expr *expr;
4442                 struct nlattr *tmp;
4443                 int left;
4444
4445                 if (!(flags & NFT_SET_EXPR)) {
4446                         err = -EINVAL;
4447                         goto err_set_expr_alloc;
4448                 }
4449                 i = 0;
4450                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4451                         if (i == NFT_SET_EXPR_MAX) {
4452                                 err = -E2BIG;
4453                                 goto err_set_expr_alloc;
4454                         }
4455                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4456                                 err = -EINVAL;
4457                                 goto err_set_expr_alloc;
4458                         }
4459                         expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
4460                         if (IS_ERR(expr)) {
4461                                 err = PTR_ERR(expr);
4462                                 goto err_set_expr_alloc;
4463                         }
4464                         set->exprs[i++] = expr;
4465                         set->num_exprs++;
4466                 }
4467         }
4468
4469         set->handle = nf_tables_alloc_handle(table);
4470
4471         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4472         if (err < 0)
4473                 goto err_set_expr_alloc;
4474
4475         list_add_tail_rcu(&set->list, &table->sets);
4476         table->use++;
4477         return 0;
4478
4479 err_set_expr_alloc:
4480         for (i = 0; i < set->num_exprs; i++)
4481                 nft_expr_destroy(&ctx, set->exprs[i]);
4482
4483         ops->destroy(set);
4484 err_set_init:
4485         kfree(set->name);
4486 err_set_name:
4487         kvfree(set);
4488         return err;
4489 }
4490
4491 struct nft_set_elem_catchall {
4492         struct list_head        list;
4493         struct rcu_head         rcu;
4494         void                    *elem;
4495 };
4496
4497 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4498                                      struct nft_set *set)
4499 {
4500         struct nft_set_elem_catchall *next, *catchall;
4501
4502         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4503                 list_del_rcu(&catchall->list);
4504                 nft_set_elem_destroy(set, catchall->elem, true);
4505                 kfree_rcu(catchall, rcu);
4506         }
4507 }
4508
4509 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4510 {
4511         int i;
4512
4513         if (WARN_ON(set->use > 0))
4514                 return;
4515
4516         for (i = 0; i < set->num_exprs; i++)
4517                 nft_expr_destroy(ctx, set->exprs[i]);
4518
4519         set->ops->destroy(set);
4520         nft_set_catchall_destroy(ctx, set);
4521         kfree(set->name);
4522         kvfree(set);
4523 }
4524
4525 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4526                             const struct nlattr * const nla[])
4527 {
4528         struct netlink_ext_ack *extack = info->extack;
4529         u8 genmask = nft_genmask_next(info->net);
4530         u8 family = info->nfmsg->nfgen_family;
4531         struct net *net = info->net;
4532         const struct nlattr *attr;
4533         struct nft_table *table;
4534         struct nft_set *set;
4535         struct nft_ctx ctx;
4536
4537         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4538                 return -EAFNOSUPPORT;
4539
4540         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4541                                  genmask, NETLINK_CB(skb).portid);
4542         if (IS_ERR(table)) {
4543                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4544                 return PTR_ERR(table);
4545         }
4546
4547         if (nla[NFTA_SET_HANDLE]) {
4548                 attr = nla[NFTA_SET_HANDLE];
4549                 set = nft_set_lookup_byhandle(table, attr, genmask);
4550         } else {
4551                 attr = nla[NFTA_SET_NAME];
4552                 set = nft_set_lookup(table, attr, genmask);
4553         }
4554
4555         if (IS_ERR(set)) {
4556                 NL_SET_BAD_ATTR(extack, attr);
4557                 return PTR_ERR(set);
4558         }
4559         if (set->use ||
4560             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4561              atomic_read(&set->nelems) > 0)) {
4562                 NL_SET_BAD_ATTR(extack, attr);
4563                 return -EBUSY;
4564         }
4565
4566         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4567
4568         return nft_delset(&ctx, set);
4569 }
4570
4571 static int nft_validate_register_store(const struct nft_ctx *ctx,
4572                                        enum nft_registers reg,
4573                                        const struct nft_data *data,
4574                                        enum nft_data_types type,
4575                                        unsigned int len);
4576
4577 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4578                                      struct nft_set *set,
4579                                      struct nft_set_elem *elem)
4580 {
4581         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4582         enum nft_registers dreg;
4583
4584         dreg = nft_type_to_reg(set->dtype);
4585         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4586                                            set->dtype == NFT_DATA_VERDICT ?
4587                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4588                                            set->dlen);
4589 }
4590
4591 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4592                                         struct nft_set *set,
4593                                         const struct nft_set_iter *iter,
4594                                         struct nft_set_elem *elem)
4595 {
4596         return nft_setelem_data_validate(ctx, set, elem);
4597 }
4598
4599 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4600                                        struct nft_set *set)
4601 {
4602         u8 genmask = nft_genmask_next(ctx->net);
4603         struct nft_set_elem_catchall *catchall;
4604         struct nft_set_elem elem;
4605         struct nft_set_ext *ext;
4606         int ret = 0;
4607
4608         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4609                 ext = nft_set_elem_ext(set, catchall->elem);
4610                 if (!nft_set_elem_active(ext, genmask))
4611                         continue;
4612
4613                 elem.priv = catchall->elem;
4614                 ret = nft_setelem_data_validate(ctx, set, &elem);
4615                 if (ret < 0)
4616                         break;
4617         }
4618
4619         return ret;
4620 }
4621
4622 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4623                        struct nft_set_binding *binding)
4624 {
4625         struct nft_set_binding *i;
4626         struct nft_set_iter iter;
4627
4628         if (set->use == UINT_MAX)
4629                 return -EOVERFLOW;
4630
4631         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4632                 return -EBUSY;
4633
4634         if (binding->flags & NFT_SET_MAP) {
4635                 /* If the set is already bound to the same chain all
4636                  * jumps are already validated for that chain.
4637                  */
4638                 list_for_each_entry(i, &set->bindings, list) {
4639                         if (i->flags & NFT_SET_MAP &&
4640                             i->chain == binding->chain)
4641                                 goto bind;
4642                 }
4643
4644                 iter.genmask    = nft_genmask_next(ctx->net);
4645                 iter.skip       = 0;
4646                 iter.count      = 0;
4647                 iter.err        = 0;
4648                 iter.fn         = nf_tables_bind_check_setelem;
4649
4650                 set->ops->walk(ctx, set, &iter);
4651                 if (!iter.err)
4652                         iter.err = nft_set_catchall_bind_check(ctx, set);
4653
4654                 if (iter.err < 0)
4655                         return iter.err;
4656         }
4657 bind:
4658         binding->chain = ctx->chain;
4659         list_add_tail_rcu(&binding->list, &set->bindings);
4660         nft_set_trans_bind(ctx, set);
4661         set->use++;
4662
4663         return 0;
4664 }
4665 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4666
4667 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4668                                  struct nft_set_binding *binding, bool event)
4669 {
4670         list_del_rcu(&binding->list);
4671
4672         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4673                 list_del_rcu(&set->list);
4674                 if (event)
4675                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4676                                              GFP_KERNEL);
4677         }
4678 }
4679
4680 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4681                               struct nft_set_binding *binding,
4682                               enum nft_trans_phase phase)
4683 {
4684         switch (phase) {
4685         case NFT_TRANS_PREPARE:
4686                 set->use--;
4687                 return;
4688         case NFT_TRANS_ABORT:
4689         case NFT_TRANS_RELEASE:
4690                 set->use--;
4691                 fallthrough;
4692         default:
4693                 nf_tables_unbind_set(ctx, set, binding,
4694                                      phase == NFT_TRANS_COMMIT);
4695         }
4696 }
4697 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4698
4699 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4700 {
4701         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4702                 nft_set_destroy(ctx, set);
4703 }
4704 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4705
4706 const struct nft_set_ext_type nft_set_ext_types[] = {
4707         [NFT_SET_EXT_KEY]               = {
4708                 .align  = __alignof__(u32),
4709         },
4710         [NFT_SET_EXT_DATA]              = {
4711                 .align  = __alignof__(u32),
4712         },
4713         [NFT_SET_EXT_EXPRESSIONS]       = {
4714                 .align  = __alignof__(struct nft_set_elem_expr),
4715         },
4716         [NFT_SET_EXT_OBJREF]            = {
4717                 .len    = sizeof(struct nft_object *),
4718                 .align  = __alignof__(struct nft_object *),
4719         },
4720         [NFT_SET_EXT_FLAGS]             = {
4721                 .len    = sizeof(u8),
4722                 .align  = __alignof__(u8),
4723         },
4724         [NFT_SET_EXT_TIMEOUT]           = {
4725                 .len    = sizeof(u64),
4726                 .align  = __alignof__(u64),
4727         },
4728         [NFT_SET_EXT_EXPIRATION]        = {
4729                 .len    = sizeof(u64),
4730                 .align  = __alignof__(u64),
4731         },
4732         [NFT_SET_EXT_USERDATA]          = {
4733                 .len    = sizeof(struct nft_userdata),
4734                 .align  = __alignof__(struct nft_userdata),
4735         },
4736         [NFT_SET_EXT_KEY_END]           = {
4737                 .align  = __alignof__(u32),
4738         },
4739 };
4740
4741 /*
4742  * Set elements
4743  */
4744
4745 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4746         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
4747         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
4748         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
4749         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
4750         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
4751         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
4752                                             .len = NFT_USERDATA_MAXLEN },
4753         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
4754         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
4755                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
4756         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
4757         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
4758 };
4759
4760 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4761         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
4762                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4763         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
4764                                             .len = NFT_SET_MAXNAMELEN - 1 },
4765         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
4766         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
4767 };
4768
4769 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4770                                   const struct nft_set *set,
4771                                   const struct nft_set_ext *ext)
4772 {
4773         struct nft_set_elem_expr *elem_expr;
4774         u32 size, num_exprs = 0;
4775         struct nft_expr *expr;
4776         struct nlattr *nest;
4777
4778         elem_expr = nft_set_ext_expr(ext);
4779         nft_setelem_expr_foreach(expr, elem_expr, size)
4780                 num_exprs++;
4781
4782         if (num_exprs == 1) {
4783                 expr = nft_setelem_expr_at(elem_expr, 0);
4784                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4785                         return -1;
4786
4787                 return 0;
4788         } else if (num_exprs > 1) {
4789                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4790                 if (nest == NULL)
4791                         goto nla_put_failure;
4792
4793                 nft_setelem_expr_foreach(expr, elem_expr, size) {
4794                         expr = nft_setelem_expr_at(elem_expr, size);
4795                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4796                                 goto nla_put_failure;
4797                 }
4798                 nla_nest_end(skb, nest);
4799         }
4800         return 0;
4801
4802 nla_put_failure:
4803         return -1;
4804 }
4805
4806 static int nf_tables_fill_setelem(struct sk_buff *skb,
4807                                   const struct nft_set *set,
4808                                   const struct nft_set_elem *elem)
4809 {
4810         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4811         unsigned char *b = skb_tail_pointer(skb);
4812         struct nlattr *nest;
4813
4814         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4815         if (nest == NULL)
4816                 goto nla_put_failure;
4817
4818         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
4819             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4820                           NFT_DATA_VALUE, set->klen) < 0)
4821                 goto nla_put_failure;
4822
4823         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4824             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4825                           NFT_DATA_VALUE, set->klen) < 0)
4826                 goto nla_put_failure;
4827
4828         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4829             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4830                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4831                           set->dlen) < 0)
4832                 goto nla_put_failure;
4833
4834         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4835             nft_set_elem_expr_dump(skb, set, ext))
4836                 goto nla_put_failure;
4837
4838         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4839             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4840                            (*nft_set_ext_obj(ext))->key.name) < 0)
4841                 goto nla_put_failure;
4842
4843         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4844             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4845                          htonl(*nft_set_ext_flags(ext))))
4846                 goto nla_put_failure;
4847
4848         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4849             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4850                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4851                          NFTA_SET_ELEM_PAD))
4852                 goto nla_put_failure;
4853
4854         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4855                 u64 expires, now = get_jiffies_64();
4856
4857                 expires = *nft_set_ext_expiration(ext);
4858                 if (time_before64(now, expires))
4859                         expires -= now;
4860                 else
4861                         expires = 0;
4862
4863                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4864                                  nf_jiffies64_to_msecs(expires),
4865                                  NFTA_SET_ELEM_PAD))
4866                         goto nla_put_failure;
4867         }
4868
4869         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4870                 struct nft_userdata *udata;
4871
4872                 udata = nft_set_ext_userdata(ext);
4873                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4874                             udata->len + 1, udata->data))
4875                         goto nla_put_failure;
4876         }
4877
4878         nla_nest_end(skb, nest);
4879         return 0;
4880
4881 nla_put_failure:
4882         nlmsg_trim(skb, b);
4883         return -EMSGSIZE;
4884 }
4885
4886 struct nft_set_dump_args {
4887         const struct netlink_callback   *cb;
4888         struct nft_set_iter             iter;
4889         struct sk_buff                  *skb;
4890 };
4891
4892 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4893                                   struct nft_set *set,
4894                                   const struct nft_set_iter *iter,
4895                                   struct nft_set_elem *elem)
4896 {
4897         struct nft_set_dump_args *args;
4898
4899         args = container_of(iter, struct nft_set_dump_args, iter);
4900         return nf_tables_fill_setelem(args->skb, set, elem);
4901 }
4902
4903 struct nft_set_dump_ctx {
4904         const struct nft_set    *set;
4905         struct nft_ctx          ctx;
4906 };
4907
4908 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
4909                                  const struct nft_set *set)
4910 {
4911         struct nft_set_elem_catchall *catchall;
4912         u8 genmask = nft_genmask_cur(net);
4913         struct nft_set_elem elem;
4914         struct nft_set_ext *ext;
4915         int ret = 0;
4916
4917         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4918                 ext = nft_set_elem_ext(set, catchall->elem);
4919                 if (!nft_set_elem_active(ext, genmask) ||
4920                     nft_set_elem_expired(ext))
4921                         continue;
4922
4923                 elem.priv = catchall->elem;
4924                 ret = nf_tables_fill_setelem(skb, set, &elem);
4925                 break;
4926         }
4927
4928         return ret;
4929 }
4930
4931 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4932 {
4933         struct nft_set_dump_ctx *dump_ctx = cb->data;
4934         struct net *net = sock_net(skb->sk);
4935         struct nftables_pernet *nft_net;
4936         struct nft_table *table;
4937         struct nft_set *set;
4938         struct nft_set_dump_args args;
4939         bool set_found = false;
4940         struct nlmsghdr *nlh;
4941         struct nlattr *nest;
4942         u32 portid, seq;
4943         int event;
4944
4945         rcu_read_lock();
4946         nft_net = nft_pernet(net);
4947         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4948                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4949                     dump_ctx->ctx.family != table->family)
4950                         continue;
4951
4952                 if (table != dump_ctx->ctx.table)
4953                         continue;
4954
4955                 list_for_each_entry_rcu(set, &table->sets, list) {
4956                         if (set == dump_ctx->set) {
4957                                 set_found = true;
4958                                 break;
4959                         }
4960                 }
4961                 break;
4962         }
4963
4964         if (!set_found) {
4965                 rcu_read_unlock();
4966                 return -ENOENT;
4967         }
4968
4969         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4970         portid = NETLINK_CB(cb->skb).portid;
4971         seq    = cb->nlh->nlmsg_seq;
4972
4973         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
4974                            table->family, NFNETLINK_V0, nft_base_seq(net));
4975         if (!nlh)
4976                 goto nla_put_failure;
4977
4978         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4979                 goto nla_put_failure;
4980         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4981                 goto nla_put_failure;
4982
4983         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4984         if (nest == NULL)
4985                 goto nla_put_failure;
4986
4987         args.cb                 = cb;
4988         args.skb                = skb;
4989         args.iter.genmask       = nft_genmask_cur(net);
4990         args.iter.skip          = cb->args[0];
4991         args.iter.count         = 0;
4992         args.iter.err           = 0;
4993         args.iter.fn            = nf_tables_dump_setelem;
4994         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4995
4996         if (!args.iter.err && args.iter.count == cb->args[0])
4997                 args.iter.err = nft_set_catchall_dump(net, skb, set);
4998         rcu_read_unlock();
4999
5000         nla_nest_end(skb, nest);
5001         nlmsg_end(skb, nlh);
5002
5003         if (args.iter.err && args.iter.err != -EMSGSIZE)
5004                 return args.iter.err;
5005         if (args.iter.count == cb->args[0])
5006                 return 0;
5007
5008         cb->args[0] = args.iter.count;
5009         return skb->len;
5010
5011 nla_put_failure:
5012         rcu_read_unlock();
5013         return -ENOSPC;
5014 }
5015
5016 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5017 {
5018         struct nft_set_dump_ctx *dump_ctx = cb->data;
5019
5020         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5021
5022         return cb->data ? 0 : -ENOMEM;
5023 }
5024
5025 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5026 {
5027         kfree(cb->data);
5028         return 0;
5029 }
5030
5031 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5032                                        const struct nft_ctx *ctx, u32 seq,
5033                                        u32 portid, int event, u16 flags,
5034                                        const struct nft_set *set,
5035                                        const struct nft_set_elem *elem)
5036 {
5037         struct nlmsghdr *nlh;
5038         struct nlattr *nest;
5039         int err;
5040
5041         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5042         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5043                            NFNETLINK_V0, nft_base_seq(ctx->net));
5044         if (!nlh)
5045                 goto nla_put_failure;
5046
5047         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5048                 goto nla_put_failure;
5049         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5050                 goto nla_put_failure;
5051
5052         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5053         if (nest == NULL)
5054                 goto nla_put_failure;
5055
5056         err = nf_tables_fill_setelem(skb, set, elem);
5057         if (err < 0)
5058                 goto nla_put_failure;
5059
5060         nla_nest_end(skb, nest);
5061
5062         nlmsg_end(skb, nlh);
5063         return 0;
5064
5065 nla_put_failure:
5066         nlmsg_trim(skb, nlh);
5067         return -1;
5068 }
5069
5070 static int nft_setelem_parse_flags(const struct nft_set *set,
5071                                    const struct nlattr *attr, u32 *flags)
5072 {
5073         if (attr == NULL)
5074                 return 0;
5075
5076         *flags = ntohl(nla_get_be32(attr));
5077         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5078                 return -EOPNOTSUPP;
5079         if (!(set->flags & NFT_SET_INTERVAL) &&
5080             *flags & NFT_SET_ELEM_INTERVAL_END)
5081                 return -EINVAL;
5082
5083         return 0;
5084 }
5085
5086 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5087                                  struct nft_data *key, struct nlattr *attr)
5088 {
5089         struct nft_data_desc desc;
5090         int err;
5091
5092         err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
5093         if (err < 0)
5094                 return err;
5095
5096         if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
5097                 nft_data_release(key, desc.type);
5098                 return -EINVAL;
5099         }
5100
5101         return 0;
5102 }
5103
5104 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5105                                   struct nft_data_desc *desc,
5106                                   struct nft_data *data,
5107                                   struct nlattr *attr)
5108 {
5109         int err;
5110
5111         err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
5112         if (err < 0)
5113                 return err;
5114
5115         if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
5116                 nft_data_release(data, desc->type);
5117                 return -EINVAL;
5118         }
5119
5120         return 0;
5121 }
5122
5123 static void *nft_setelem_catchall_get(const struct net *net,
5124                                       const struct nft_set *set)
5125 {
5126         struct nft_set_elem_catchall *catchall;
5127         u8 genmask = nft_genmask_cur(net);
5128         struct nft_set_ext *ext;
5129         void *priv = NULL;
5130
5131         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5132                 ext = nft_set_elem_ext(set, catchall->elem);
5133                 if (!nft_set_elem_active(ext, genmask) ||
5134                     nft_set_elem_expired(ext))
5135                         continue;
5136
5137                 priv = catchall->elem;
5138                 break;
5139         }
5140
5141         return priv;
5142 }
5143
5144 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5145                            struct nft_set_elem *elem, u32 flags)
5146 {
5147         void *priv;
5148
5149         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5150                 priv = set->ops->get(ctx->net, set, elem, flags);
5151                 if (IS_ERR(priv))
5152                         return PTR_ERR(priv);
5153         } else {
5154                 priv = nft_setelem_catchall_get(ctx->net, set);
5155                 if (!priv)
5156                         return -ENOENT;
5157         }
5158         elem->priv = priv;
5159
5160         return 0;
5161 }
5162
5163 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5164                             const struct nlattr *attr)
5165 {
5166         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5167         struct nft_set_elem elem;
5168         struct sk_buff *skb;
5169         uint32_t flags = 0;
5170         int err;
5171
5172         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5173                                           nft_set_elem_policy, NULL);
5174         if (err < 0)
5175                 return err;
5176
5177         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5178         if (err < 0)
5179                 return err;
5180
5181         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5182                 return -EINVAL;
5183
5184         if (nla[NFTA_SET_ELEM_KEY]) {
5185                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5186                                             nla[NFTA_SET_ELEM_KEY]);
5187                 if (err < 0)
5188                         return err;
5189         }
5190
5191         if (nla[NFTA_SET_ELEM_KEY_END]) {
5192                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5193                                             nla[NFTA_SET_ELEM_KEY_END]);
5194                 if (err < 0)
5195                         return err;
5196         }
5197
5198         err = nft_setelem_get(ctx, set, &elem, flags);
5199         if (err < 0)
5200                 return err;
5201
5202         err = -ENOMEM;
5203         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5204         if (skb == NULL)
5205                 return err;
5206
5207         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5208                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
5209         if (err < 0)
5210                 goto err_fill_setelem;
5211
5212         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5213
5214 err_fill_setelem:
5215         kfree_skb(skb);
5216         return err;
5217 }
5218
5219 /* called with rcu_read_lock held */
5220 static int nf_tables_getsetelem(struct sk_buff *skb,
5221                                 const struct nfnl_info *info,
5222                                 const struct nlattr * const nla[])
5223 {
5224         struct netlink_ext_ack *extack = info->extack;
5225         u8 genmask = nft_genmask_cur(info->net);
5226         u8 family = info->nfmsg->nfgen_family;
5227         struct net *net = info->net;
5228         struct nft_table *table;
5229         struct nft_set *set;
5230         struct nlattr *attr;
5231         struct nft_ctx ctx;
5232         int rem, err = 0;
5233
5234         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5235                                  genmask, NETLINK_CB(skb).portid);
5236         if (IS_ERR(table)) {
5237                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5238                 return PTR_ERR(table);
5239         }
5240
5241         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5242         if (IS_ERR(set))
5243                 return PTR_ERR(set);
5244
5245         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5246
5247         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5248                 struct netlink_dump_control c = {
5249                         .start = nf_tables_dump_set_start,
5250                         .dump = nf_tables_dump_set,
5251                         .done = nf_tables_dump_set_done,
5252                         .module = THIS_MODULE,
5253                 };
5254                 struct nft_set_dump_ctx dump_ctx = {
5255                         .set = set,
5256                         .ctx = ctx,
5257                 };
5258
5259                 c.data = &dump_ctx;
5260                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5261         }
5262
5263         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5264                 return -EINVAL;
5265
5266         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5267                 err = nft_get_set_elem(&ctx, set, attr);
5268                 if (err < 0)
5269                         break;
5270         }
5271
5272         return err;
5273 }
5274
5275 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5276                                      const struct nft_set *set,
5277                                      const struct nft_set_elem *elem,
5278                                      int event)
5279 {
5280         struct nftables_pernet *nft_net;
5281         struct net *net = ctx->net;
5282         u32 portid = ctx->portid;
5283         struct sk_buff *skb;
5284         u16 flags = 0;
5285         int err;
5286
5287         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5288                 return;
5289
5290         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5291         if (skb == NULL)
5292                 goto err;
5293
5294         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5295                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5296
5297         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5298                                           set, elem);
5299         if (err < 0) {
5300                 kfree_skb(skb);
5301                 goto err;
5302         }
5303
5304         nft_net = nft_pernet(net);
5305         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5306         return;
5307 err:
5308         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5309 }
5310
5311 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5312                                               int msg_type,
5313                                               struct nft_set *set)
5314 {
5315         struct nft_trans *trans;
5316
5317         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5318         if (trans == NULL)
5319                 return NULL;
5320
5321         nft_trans_elem_set(trans) = set;
5322         return trans;
5323 }
5324
5325 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5326                                          const struct nft_set *set,
5327                                          const struct nlattr *attr)
5328 {
5329         struct nft_expr *expr;
5330         int err;
5331
5332         expr = nft_expr_init(ctx, attr);
5333         if (IS_ERR(expr))
5334                 return expr;
5335
5336         err = -EOPNOTSUPP;
5337         if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL))
5338                 goto err_set_elem_expr;
5339
5340         if (expr->ops->type->flags & NFT_EXPR_GC) {
5341                 if (set->flags & NFT_SET_TIMEOUT)
5342                         goto err_set_elem_expr;
5343                 if (!set->ops->gc_init)
5344                         goto err_set_elem_expr;
5345                 set->ops->gc_init(set);
5346         }
5347
5348         return expr;
5349
5350 err_set_elem_expr:
5351         nft_expr_destroy(ctx, expr);
5352         return ERR_PTR(err);
5353 }
5354
5355 void *nft_set_elem_init(const struct nft_set *set,
5356                         const struct nft_set_ext_tmpl *tmpl,
5357                         const u32 *key, const u32 *key_end,
5358                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5359 {
5360         struct nft_set_ext *ext;
5361         void *elem;
5362
5363         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5364         if (elem == NULL)
5365                 return NULL;
5366
5367         ext = nft_set_elem_ext(set, elem);
5368         nft_set_ext_init(ext, tmpl);
5369
5370         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY))
5371                 memcpy(nft_set_ext_key(ext), key, set->klen);
5372         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5373                 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5374         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5375                 memcpy(nft_set_ext_data(ext), data, set->dlen);
5376         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5377                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5378                 if (expiration == 0)
5379                         *nft_set_ext_expiration(ext) += timeout;
5380         }
5381         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5382                 *nft_set_ext_timeout(ext) = timeout;
5383
5384         return elem;
5385 }
5386
5387 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5388                                         struct nft_expr *expr)
5389 {
5390         if (expr->ops->destroy_clone) {
5391                 expr->ops->destroy_clone(ctx, expr);
5392                 module_put(expr->ops->type->owner);
5393         } else {
5394                 nf_tables_expr_destroy(ctx, expr);
5395         }
5396 }
5397
5398 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5399                                       struct nft_set_elem_expr *elem_expr)
5400 {
5401         struct nft_expr *expr;
5402         u32 size;
5403
5404         nft_setelem_expr_foreach(expr, elem_expr, size)
5405                 __nft_set_elem_expr_destroy(ctx, expr);
5406 }
5407
5408 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5409                           bool destroy_expr)
5410 {
5411         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5412         struct nft_ctx ctx = {
5413                 .net    = read_pnet(&set->net),
5414                 .family = set->table->family,
5415         };
5416
5417         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5418         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5419                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5420         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5421                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5422
5423         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5424                 (*nft_set_ext_obj(ext))->use--;
5425         kfree(elem);
5426 }
5427 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5428
5429 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5430  * with the refcounting from the preparation phase.
5431  */
5432 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5433                                        const struct nft_set *set, void *elem)
5434 {
5435         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5436
5437         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5438                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5439
5440         kfree(elem);
5441 }
5442
5443 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5444                             struct nft_expr *expr_array[])
5445 {
5446         struct nft_expr *expr;
5447         int err, i, k;
5448
5449         for (i = 0; i < set->num_exprs; i++) {
5450                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL);
5451                 if (!expr)
5452                         goto err_expr;
5453
5454                 err = nft_expr_clone(expr, set->exprs[i]);
5455                 if (err < 0) {
5456                         nft_expr_destroy(ctx, expr);
5457                         goto err_expr;
5458                 }
5459                 expr_array[i] = expr;
5460         }
5461
5462         return 0;
5463
5464 err_expr:
5465         for (k = i - 1; k >= 0; k--)
5466                 nft_expr_destroy(ctx, expr_array[k]);
5467
5468         return -ENOMEM;
5469 }
5470
5471 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5472                                    const struct nft_set_ext *ext,
5473                                    struct nft_expr *expr_array[],
5474                                    u32 num_exprs)
5475 {
5476         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5477         struct nft_expr *expr;
5478         int i, err;
5479
5480         for (i = 0; i < num_exprs; i++) {
5481                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5482                 err = nft_expr_clone(expr, expr_array[i]);
5483                 if (err < 0)
5484                         goto err_elem_expr_setup;
5485
5486                 elem_expr->size += expr_array[i]->ops->size;
5487                 nft_expr_destroy(ctx, expr_array[i]);
5488                 expr_array[i] = NULL;
5489         }
5490
5491         return 0;
5492
5493 err_elem_expr_setup:
5494         for (; i < num_exprs; i++) {
5495                 nft_expr_destroy(ctx, expr_array[i]);
5496                 expr_array[i] = NULL;
5497         }
5498
5499         return -ENOMEM;
5500 }
5501
5502 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5503                                             const struct nft_set *set)
5504 {
5505         struct nft_set_elem_catchall *catchall;
5506         u8 genmask = nft_genmask_cur(net);
5507         struct nft_set_ext *ext;
5508
5509         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5510                 ext = nft_set_elem_ext(set, catchall->elem);
5511                 if (nft_set_elem_active(ext, genmask) &&
5512                     !nft_set_elem_expired(ext))
5513                         return ext;
5514         }
5515
5516         return NULL;
5517 }
5518 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5519
5520 void *nft_set_catchall_gc(const struct nft_set *set)
5521 {
5522         struct nft_set_elem_catchall *catchall, *next;
5523         struct nft_set_ext *ext;
5524         void *elem = NULL;
5525
5526         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5527                 ext = nft_set_elem_ext(set, catchall->elem);
5528
5529                 if (!nft_set_elem_expired(ext) ||
5530                     nft_set_elem_mark_busy(ext))
5531                         continue;
5532
5533                 elem = catchall->elem;
5534                 list_del_rcu(&catchall->list);
5535                 kfree_rcu(catchall, rcu);
5536                 break;
5537         }
5538
5539         return elem;
5540 }
5541 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5542
5543 static int nft_setelem_catchall_insert(const struct net *net,
5544                                        struct nft_set *set,
5545                                        const struct nft_set_elem *elem,
5546                                        struct nft_set_ext **pext)
5547 {
5548         struct nft_set_elem_catchall *catchall;
5549         u8 genmask = nft_genmask_next(net);
5550         struct nft_set_ext *ext;
5551
5552         list_for_each_entry(catchall, &set->catchall_list, list) {
5553                 ext = nft_set_elem_ext(set, catchall->elem);
5554                 if (nft_set_elem_active(ext, genmask)) {
5555                         *pext = ext;
5556                         return -EEXIST;
5557                 }
5558         }
5559
5560         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5561         if (!catchall)
5562                 return -ENOMEM;
5563
5564         catchall->elem = elem->priv;
5565         list_add_tail_rcu(&catchall->list, &set->catchall_list);
5566
5567         return 0;
5568 }
5569
5570 static int nft_setelem_insert(const struct net *net,
5571                               struct nft_set *set,
5572                               const struct nft_set_elem *elem,
5573                               struct nft_set_ext **ext, unsigned int flags)
5574 {
5575         int ret;
5576
5577         if (flags & NFT_SET_ELEM_CATCHALL)
5578                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5579         else
5580                 ret = set->ops->insert(net, set, elem, ext);
5581
5582         return ret;
5583 }
5584
5585 static bool nft_setelem_is_catchall(const struct nft_set *set,
5586                                     const struct nft_set_elem *elem)
5587 {
5588         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5589
5590         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5591             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5592                 return true;
5593
5594         return false;
5595 }
5596
5597 static void nft_setelem_activate(struct net *net, struct nft_set *set,
5598                                  struct nft_set_elem *elem)
5599 {
5600         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5601
5602         if (nft_setelem_is_catchall(set, elem)) {
5603                 nft_set_elem_change_active(net, set, ext);
5604                 nft_set_elem_clear_busy(ext);
5605         } else {
5606                 set->ops->activate(net, set, elem);
5607         }
5608 }
5609
5610 static int nft_setelem_catchall_deactivate(const struct net *net,
5611                                            struct nft_set *set,
5612                                            struct nft_set_elem *elem)
5613 {
5614         struct nft_set_elem_catchall *catchall;
5615         struct nft_set_ext *ext;
5616
5617         list_for_each_entry(catchall, &set->catchall_list, list) {
5618                 ext = nft_set_elem_ext(set, catchall->elem);
5619                 if (!nft_is_active(net, ext) ||
5620                     nft_set_elem_mark_busy(ext))
5621                         continue;
5622
5623                 kfree(elem->priv);
5624                 elem->priv = catchall->elem;
5625                 nft_set_elem_change_active(net, set, ext);
5626                 return 0;
5627         }
5628
5629         return -ENOENT;
5630 }
5631
5632 static int __nft_setelem_deactivate(const struct net *net,
5633                                     struct nft_set *set,
5634                                     struct nft_set_elem *elem)
5635 {
5636         void *priv;
5637
5638         priv = set->ops->deactivate(net, set, elem);
5639         if (!priv)
5640                 return -ENOENT;
5641
5642         kfree(elem->priv);
5643         elem->priv = priv;
5644         set->ndeact++;
5645
5646         return 0;
5647 }
5648
5649 static int nft_setelem_deactivate(const struct net *net,
5650                                   struct nft_set *set,
5651                                   struct nft_set_elem *elem, u32 flags)
5652 {
5653         int ret;
5654
5655         if (flags & NFT_SET_ELEM_CATCHALL)
5656                 ret = nft_setelem_catchall_deactivate(net, set, elem);
5657         else
5658                 ret = __nft_setelem_deactivate(net, set, elem);
5659
5660         return ret;
5661 }
5662
5663 static void nft_setelem_catchall_remove(const struct net *net,
5664                                         const struct nft_set *set,
5665                                         const struct nft_set_elem *elem)
5666 {
5667         struct nft_set_elem_catchall *catchall, *next;
5668
5669         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5670                 if (catchall->elem == elem->priv) {
5671                         list_del_rcu(&catchall->list);
5672                         kfree_rcu(catchall, rcu);
5673                         break;
5674                 }
5675         }
5676 }
5677
5678 static void nft_setelem_remove(const struct net *net,
5679                                const struct nft_set *set,
5680                                const struct nft_set_elem *elem)
5681 {
5682         if (nft_setelem_is_catchall(set, elem))
5683                 nft_setelem_catchall_remove(net, set, elem);
5684         else
5685                 set->ops->remove(net, set, elem);
5686 }
5687
5688 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5689                             const struct nlattr *attr, u32 nlmsg_flags)
5690 {
5691         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5692         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5693         u8 genmask = nft_genmask_next(ctx->net);
5694         u32 flags = 0, size = 0, num_exprs = 0;
5695         struct nft_set_ext_tmpl tmpl;
5696         struct nft_set_ext *ext, *ext2;
5697         struct nft_set_elem elem;
5698         struct nft_set_binding *binding;
5699         struct nft_object *obj = NULL;
5700         struct nft_userdata *udata;
5701         struct nft_data_desc desc;
5702         enum nft_registers dreg;
5703         struct nft_trans *trans;
5704         u64 timeout;
5705         u64 expiration;
5706         int err, i;
5707         u8 ulen;
5708
5709         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5710                                           nft_set_elem_policy, NULL);
5711         if (err < 0)
5712                 return err;
5713
5714         nft_set_ext_prepare(&tmpl);
5715
5716         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5717         if (err < 0)
5718                 return err;
5719
5720         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5721                 return -EINVAL;
5722
5723         if (flags != 0)
5724                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5725
5726         if (set->flags & NFT_SET_MAP) {
5727                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5728                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5729                         return -EINVAL;
5730         } else {
5731                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5732                         return -EINVAL;
5733         }
5734
5735         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5736              (nla[NFTA_SET_ELEM_DATA] ||
5737               nla[NFTA_SET_ELEM_OBJREF] ||
5738               nla[NFTA_SET_ELEM_TIMEOUT] ||
5739               nla[NFTA_SET_ELEM_EXPIRATION] ||
5740               nla[NFTA_SET_ELEM_USERDATA] ||
5741               nla[NFTA_SET_ELEM_EXPR] ||
5742               nla[NFTA_SET_ELEM_EXPRESSIONS]))
5743                 return -EINVAL;
5744
5745         timeout = 0;
5746         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5747                 if (!(set->flags & NFT_SET_TIMEOUT))
5748                         return -EINVAL;
5749                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5750                                             &timeout);
5751                 if (err)
5752                         return err;
5753         } else if (set->flags & NFT_SET_TIMEOUT) {
5754                 timeout = set->timeout;
5755         }
5756
5757         expiration = 0;
5758         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5759                 if (!(set->flags & NFT_SET_TIMEOUT))
5760                         return -EINVAL;
5761                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5762                                             &expiration);
5763                 if (err)
5764                         return err;
5765         }
5766
5767         if (nla[NFTA_SET_ELEM_EXPR]) {
5768                 struct nft_expr *expr;
5769
5770                 if (set->num_exprs && set->num_exprs != 1)
5771                         return -EOPNOTSUPP;
5772
5773                 expr = nft_set_elem_expr_alloc(ctx, set,
5774                                                nla[NFTA_SET_ELEM_EXPR]);
5775                 if (IS_ERR(expr))
5776                         return PTR_ERR(expr);
5777
5778                 expr_array[0] = expr;
5779                 num_exprs = 1;
5780
5781                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
5782                         err = -EOPNOTSUPP;
5783                         goto err_set_elem_expr;
5784                 }
5785         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5786                 struct nft_expr *expr;
5787                 struct nlattr *tmp;
5788                 int left;
5789
5790                 i = 0;
5791                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
5792                         if (i == NFT_SET_EXPR_MAX ||
5793                             (set->num_exprs && set->num_exprs == i)) {
5794                                 err = -E2BIG;
5795                                 goto err_set_elem_expr;
5796                         }
5797                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
5798                                 err = -EINVAL;
5799                                 goto err_set_elem_expr;
5800                         }
5801                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5802                         if (IS_ERR(expr)) {
5803                                 err = PTR_ERR(expr);
5804                                 goto err_set_elem_expr;
5805                         }
5806                         expr_array[i] = expr;
5807                         num_exprs++;
5808
5809                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
5810                                 err = -EOPNOTSUPP;
5811                                 goto err_set_elem_expr;
5812                         }
5813                         i++;
5814                 }
5815                 if (set->num_exprs && set->num_exprs != i) {
5816                         err = -EOPNOTSUPP;
5817                         goto err_set_elem_expr;
5818                 }
5819         } else if (set->num_exprs > 0) {
5820                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5821                 if (err < 0)
5822                         goto err_set_elem_expr_clone;
5823
5824                 num_exprs = set->num_exprs;
5825         }
5826
5827         if (nla[NFTA_SET_ELEM_KEY]) {
5828                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5829                                             nla[NFTA_SET_ELEM_KEY]);
5830                 if (err < 0)
5831                         goto err_set_elem_expr;
5832
5833                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5834         }
5835
5836         if (nla[NFTA_SET_ELEM_KEY_END]) {
5837                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5838                                             nla[NFTA_SET_ELEM_KEY_END]);
5839                 if (err < 0)
5840                         goto err_parse_key;
5841
5842                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5843         }
5844
5845         if (timeout > 0) {
5846                 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5847                 if (timeout != set->timeout)
5848                         nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5849         }
5850
5851         if (num_exprs) {
5852                 for (i = 0; i < num_exprs; i++)
5853                         size += expr_array[i]->ops->size;
5854
5855                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
5856                                        sizeof(struct nft_set_elem_expr) +
5857                                        size);
5858         }
5859
5860         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5861                 if (!(set->flags & NFT_SET_OBJECT)) {
5862                         err = -EINVAL;
5863                         goto err_parse_key_end;
5864                 }
5865                 obj = nft_obj_lookup(ctx->net, ctx->table,
5866                                      nla[NFTA_SET_ELEM_OBJREF],
5867                                      set->objtype, genmask);
5868                 if (IS_ERR(obj)) {
5869                         err = PTR_ERR(obj);
5870                         goto err_parse_key_end;
5871                 }
5872                 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5873         }
5874
5875         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5876                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5877                                              nla[NFTA_SET_ELEM_DATA]);
5878                 if (err < 0)
5879                         goto err_parse_key_end;
5880
5881                 dreg = nft_type_to_reg(set->dtype);
5882                 list_for_each_entry(binding, &set->bindings, list) {
5883                         struct nft_ctx bind_ctx = {
5884                                 .net    = ctx->net,
5885                                 .family = ctx->family,
5886                                 .table  = ctx->table,
5887                                 .chain  = (struct nft_chain *)binding->chain,
5888                         };
5889
5890                         if (!(binding->flags & NFT_SET_MAP))
5891                                 continue;
5892
5893                         err = nft_validate_register_store(&bind_ctx, dreg,
5894                                                           &elem.data.val,
5895                                                           desc.type, desc.len);
5896                         if (err < 0)
5897                                 goto err_parse_data;
5898
5899                         if (desc.type == NFT_DATA_VERDICT &&
5900                             (elem.data.val.verdict.code == NFT_GOTO ||
5901                              elem.data.val.verdict.code == NFT_JUMP))
5902                                 nft_validate_state_update(ctx->net,
5903                                                           NFT_VALIDATE_NEED);
5904                 }
5905
5906                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
5907         }
5908
5909         /* The full maximum length of userdata can exceed the maximum
5910          * offset value (U8_MAX) for following extensions, therefor it
5911          * must be the last extension added.
5912          */
5913         ulen = 0;
5914         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5915                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5916                 if (ulen > 0)
5917                         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5918                                                ulen);
5919         }
5920
5921         err = -ENOMEM;
5922         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5923                                       elem.key_end.val.data, elem.data.val.data,
5924                                       timeout, expiration, GFP_KERNEL);
5925         if (elem.priv == NULL)
5926                 goto err_parse_data;
5927
5928         ext = nft_set_elem_ext(set, elem.priv);
5929         if (flags)
5930                 *nft_set_ext_flags(ext) = flags;
5931         if (ulen > 0) {
5932                 udata = nft_set_ext_userdata(ext);
5933                 udata->len = ulen - 1;
5934                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5935         }
5936         if (obj) {
5937                 *nft_set_ext_obj(ext) = obj;
5938                 obj->use++;
5939         }
5940         err = nft_set_elem_expr_setup(ctx, ext, expr_array, num_exprs);
5941         if (err < 0)
5942                 goto err_elem_expr;
5943
5944         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5945         if (trans == NULL) {
5946                 err = -ENOMEM;
5947                 goto err_elem_expr;
5948         }
5949
5950         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
5951
5952         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
5953         if (err) {
5954                 if (err == -EEXIST) {
5955                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5956                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5957                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
5958                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
5959                                 goto err_element_clash;
5960                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5961                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5962                              memcmp(nft_set_ext_data(ext),
5963                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
5964                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5965                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5966                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
5967                                 goto err_element_clash;
5968                         else if (!(nlmsg_flags & NLM_F_EXCL))
5969                                 err = 0;
5970                 } else if (err == -ENOTEMPTY) {
5971                         /* ENOTEMPTY reports overlapping between this element
5972                          * and an existing one.
5973                          */
5974                         err = -EEXIST;
5975                 }
5976                 goto err_element_clash;
5977         }
5978
5979         if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
5980             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5981                 err = -ENFILE;
5982                 goto err_set_full;
5983         }
5984
5985         nft_trans_elem(trans) = elem;
5986         nft_trans_commit_list_add_tail(ctx->net, trans);
5987         return 0;
5988
5989 err_set_full:
5990         nft_setelem_remove(ctx->net, set, &elem);
5991 err_element_clash:
5992         kfree(trans);
5993 err_elem_expr:
5994         if (obj)
5995                 obj->use--;
5996
5997         nf_tables_set_elem_destroy(ctx, set, elem.priv);
5998 err_parse_data:
5999         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6000                 nft_data_release(&elem.data.val, desc.type);
6001 err_parse_key_end:
6002         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6003 err_parse_key:
6004         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6005 err_set_elem_expr:
6006         for (i = 0; i < num_exprs && expr_array[i]; i++)
6007                 nft_expr_destroy(ctx, expr_array[i]);
6008 err_set_elem_expr_clone:
6009         return err;
6010 }
6011
6012 static int nf_tables_newsetelem(struct sk_buff *skb,
6013                                 const struct nfnl_info *info,
6014                                 const struct nlattr * const nla[])
6015 {
6016         struct nftables_pernet *nft_net = nft_pernet(info->net);
6017         struct netlink_ext_ack *extack = info->extack;
6018         u8 genmask = nft_genmask_next(info->net);
6019         u8 family = info->nfmsg->nfgen_family;
6020         struct net *net = info->net;
6021         const struct nlattr *attr;
6022         struct nft_table *table;
6023         struct nft_set *set;
6024         struct nft_ctx ctx;
6025         int rem, err;
6026
6027         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6028                 return -EINVAL;
6029
6030         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6031                                  genmask, NETLINK_CB(skb).portid);
6032         if (IS_ERR(table)) {
6033                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6034                 return PTR_ERR(table);
6035         }
6036
6037         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6038                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6039         if (IS_ERR(set))
6040                 return PTR_ERR(set);
6041
6042         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6043                 return -EBUSY;
6044
6045         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6046
6047         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6048                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6049                 if (err < 0)
6050                         return err;
6051         }
6052
6053         if (nft_net->validate_state == NFT_VALIDATE_DO)
6054                 return nft_table_validate(net, table);
6055
6056         return 0;
6057 }
6058
6059 /**
6060  *      nft_data_hold - hold a nft_data item
6061  *
6062  *      @data: struct nft_data to release
6063  *      @type: type of data
6064  *
6065  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6066  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6067  *      NFT_GOTO verdicts. This function must be called on active data objects
6068  *      from the second phase of the commit protocol.
6069  */
6070 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6071 {
6072         struct nft_chain *chain;
6073         struct nft_rule *rule;
6074
6075         if (type == NFT_DATA_VERDICT) {
6076                 switch (data->verdict.code) {
6077                 case NFT_JUMP:
6078                 case NFT_GOTO:
6079                         chain = data->verdict.chain;
6080                         chain->use++;
6081
6082                         if (!nft_chain_is_bound(chain))
6083                                 break;
6084
6085                         chain->table->use++;
6086                         list_for_each_entry(rule, &chain->rules, list)
6087                                 chain->use++;
6088
6089                         nft_chain_add(chain->table, chain);
6090                         break;
6091                 }
6092         }
6093 }
6094
6095 static void nft_setelem_data_activate(const struct net *net,
6096                                       const struct nft_set *set,
6097                                       struct nft_set_elem *elem)
6098 {
6099         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6100
6101         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6102                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6103         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6104                 (*nft_set_ext_obj(ext))->use++;
6105 }
6106
6107 static void nft_setelem_data_deactivate(const struct net *net,
6108                                         const struct nft_set *set,
6109                                         struct nft_set_elem *elem)
6110 {
6111         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6112
6113         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6114                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6115         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6116                 (*nft_set_ext_obj(ext))->use--;
6117 }
6118
6119 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6120                            const struct nlattr *attr)
6121 {
6122         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6123         struct nft_set_ext_tmpl tmpl;
6124         struct nft_set_elem elem;
6125         struct nft_set_ext *ext;
6126         struct nft_trans *trans;
6127         u32 flags = 0;
6128         int err;
6129
6130         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6131                                           nft_set_elem_policy, NULL);
6132         if (err < 0)
6133                 return err;
6134
6135         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6136         if (err < 0)
6137                 return err;
6138
6139         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6140                 return -EINVAL;
6141
6142         nft_set_ext_prepare(&tmpl);
6143
6144         if (flags != 0)
6145                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6146
6147         if (nla[NFTA_SET_ELEM_KEY]) {
6148                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6149                                             nla[NFTA_SET_ELEM_KEY]);
6150                 if (err < 0)
6151                         return err;
6152
6153                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6154         }
6155
6156         if (nla[NFTA_SET_ELEM_KEY_END]) {
6157                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6158                                             nla[NFTA_SET_ELEM_KEY_END]);
6159                 if (err < 0)
6160                         return err;
6161
6162                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6163         }
6164
6165         err = -ENOMEM;
6166         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6167                                       elem.key_end.val.data, NULL, 0, 0,
6168                                       GFP_KERNEL);
6169         if (elem.priv == NULL)
6170                 goto fail_elem;
6171
6172         ext = nft_set_elem_ext(set, elem.priv);
6173         if (flags)
6174                 *nft_set_ext_flags(ext) = flags;
6175
6176         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6177         if (trans == NULL)
6178                 goto fail_trans;
6179
6180         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6181         if (err < 0)
6182                 goto fail_ops;
6183
6184         nft_setelem_data_deactivate(ctx->net, set, &elem);
6185
6186         nft_trans_elem(trans) = elem;
6187         nft_trans_commit_list_add_tail(ctx->net, trans);
6188         return 0;
6189
6190 fail_ops:
6191         kfree(trans);
6192 fail_trans:
6193         kfree(elem.priv);
6194 fail_elem:
6195         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6196         return err;
6197 }
6198
6199 static int nft_setelem_flush(const struct nft_ctx *ctx,
6200                              struct nft_set *set,
6201                              const struct nft_set_iter *iter,
6202                              struct nft_set_elem *elem)
6203 {
6204         struct nft_trans *trans;
6205         int err;
6206
6207         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6208                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
6209         if (!trans)
6210                 return -ENOMEM;
6211
6212         if (!set->ops->flush(ctx->net, set, elem->priv)) {
6213                 err = -ENOENT;
6214                 goto err1;
6215         }
6216         set->ndeact++;
6217
6218         nft_setelem_data_deactivate(ctx->net, set, elem);
6219         nft_trans_elem_set(trans) = set;
6220         nft_trans_elem(trans) = *elem;
6221         nft_trans_commit_list_add_tail(ctx->net, trans);
6222
6223         return 0;
6224 err1:
6225         kfree(trans);
6226         return err;
6227 }
6228
6229 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6230                                     struct nft_set *set,
6231                                     struct nft_set_elem *elem)
6232 {
6233         struct nft_trans *trans;
6234
6235         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6236                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
6237         if (!trans)
6238                 return -ENOMEM;
6239
6240         nft_setelem_data_deactivate(ctx->net, set, elem);
6241         nft_trans_elem_set(trans) = set;
6242         nft_trans_elem(trans) = *elem;
6243         nft_trans_commit_list_add_tail(ctx->net, trans);
6244
6245         return 0;
6246 }
6247
6248 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6249                                   struct nft_set *set)
6250 {
6251         u8 genmask = nft_genmask_next(ctx->net);
6252         struct nft_set_elem_catchall *catchall;
6253         struct nft_set_elem elem;
6254         struct nft_set_ext *ext;
6255         int ret = 0;
6256
6257         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6258                 ext = nft_set_elem_ext(set, catchall->elem);
6259                 if (!nft_set_elem_active(ext, genmask) ||
6260                     nft_set_elem_mark_busy(ext))
6261                         continue;
6262
6263                 elem.priv = catchall->elem;
6264                 ret = __nft_set_catchall_flush(ctx, set, &elem);
6265                 if (ret < 0)
6266                         break;
6267         }
6268
6269         return ret;
6270 }
6271
6272 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6273 {
6274         struct nft_set_iter iter = {
6275                 .genmask        = genmask,
6276                 .fn             = nft_setelem_flush,
6277         };
6278
6279         set->ops->walk(ctx, set, &iter);
6280         if (!iter.err)
6281                 iter.err = nft_set_catchall_flush(ctx, set);
6282
6283         return iter.err;
6284 }
6285
6286 static int nf_tables_delsetelem(struct sk_buff *skb,
6287                                 const struct nfnl_info *info,
6288                                 const struct nlattr * const nla[])
6289 {
6290         struct netlink_ext_ack *extack = info->extack;
6291         u8 genmask = nft_genmask_next(info->net);
6292         u8 family = info->nfmsg->nfgen_family;
6293         struct net *net = info->net;
6294         const struct nlattr *attr;
6295         struct nft_table *table;
6296         struct nft_set *set;
6297         struct nft_ctx ctx;
6298         int rem, err = 0;
6299
6300         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6301                                  genmask, NETLINK_CB(skb).portid);
6302         if (IS_ERR(table)) {
6303                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6304                 return PTR_ERR(table);
6305         }
6306
6307         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6308         if (IS_ERR(set))
6309                 return PTR_ERR(set);
6310         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6311                 return -EBUSY;
6312
6313         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6314
6315         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6316                 return nft_set_flush(&ctx, set, genmask);
6317
6318         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6319                 err = nft_del_setelem(&ctx, set, attr);
6320                 if (err < 0)
6321                         break;
6322         }
6323         return err;
6324 }
6325
6326 void nft_set_gc_batch_release(struct rcu_head *rcu)
6327 {
6328         struct nft_set_gc_batch *gcb;
6329         unsigned int i;
6330
6331         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6332         for (i = 0; i < gcb->head.cnt; i++)
6333                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6334         kfree(gcb);
6335 }
6336
6337 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6338                                                 gfp_t gfp)
6339 {
6340         struct nft_set_gc_batch *gcb;
6341
6342         gcb = kzalloc(sizeof(*gcb), gfp);
6343         if (gcb == NULL)
6344                 return gcb;
6345         gcb->head.set = set;
6346         return gcb;
6347 }
6348
6349 /*
6350  * Stateful objects
6351  */
6352
6353 /**
6354  *      nft_register_obj- register nf_tables stateful object type
6355  *      @obj_type: object type
6356  *
6357  *      Registers the object type for use with nf_tables. Returns zero on
6358  *      success or a negative errno code otherwise.
6359  */
6360 int nft_register_obj(struct nft_object_type *obj_type)
6361 {
6362         if (obj_type->type == NFT_OBJECT_UNSPEC)
6363                 return -EINVAL;
6364
6365         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6366         list_add_rcu(&obj_type->list, &nf_tables_objects);
6367         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6368         return 0;
6369 }
6370 EXPORT_SYMBOL_GPL(nft_register_obj);
6371
6372 /**
6373  *      nft_unregister_obj - unregister nf_tables object type
6374  *      @obj_type: object type
6375  *
6376  *      Unregisters the object type for use with nf_tables.
6377  */
6378 void nft_unregister_obj(struct nft_object_type *obj_type)
6379 {
6380         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6381         list_del_rcu(&obj_type->list);
6382         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6383 }
6384 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6385
6386 struct nft_object *nft_obj_lookup(const struct net *net,
6387                                   const struct nft_table *table,
6388                                   const struct nlattr *nla, u32 objtype,
6389                                   u8 genmask)
6390 {
6391         struct nft_object_hash_key k = { .table = table };
6392         char search[NFT_OBJ_MAXNAMELEN];
6393         struct rhlist_head *tmp, *list;
6394         struct nft_object *obj;
6395
6396         nla_strscpy(search, nla, sizeof(search));
6397         k.name = search;
6398
6399         WARN_ON_ONCE(!rcu_read_lock_held() &&
6400                      !lockdep_commit_lock_is_held(net));
6401
6402         rcu_read_lock();
6403         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6404         if (!list)
6405                 goto out;
6406
6407         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6408                 if (objtype == obj->ops->type->type &&
6409                     nft_active_genmask(obj, genmask)) {
6410                         rcu_read_unlock();
6411                         return obj;
6412                 }
6413         }
6414 out:
6415         rcu_read_unlock();
6416         return ERR_PTR(-ENOENT);
6417 }
6418 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6419
6420 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6421                                                   const struct nlattr *nla,
6422                                                   u32 objtype, u8 genmask)
6423 {
6424         struct nft_object *obj;
6425
6426         list_for_each_entry(obj, &table->objects, list) {
6427                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6428                     objtype == obj->ops->type->type &&
6429                     nft_active_genmask(obj, genmask))
6430                         return obj;
6431         }
6432         return ERR_PTR(-ENOENT);
6433 }
6434
6435 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6436         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
6437                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
6438         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
6439                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
6440         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
6441         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
6442         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
6443         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
6444                                     .len = NFT_USERDATA_MAXLEN },
6445 };
6446
6447 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6448                                        const struct nft_object_type *type,
6449                                        const struct nlattr *attr)
6450 {
6451         struct nlattr **tb;
6452         const struct nft_object_ops *ops;
6453         struct nft_object *obj;
6454         int err = -ENOMEM;
6455
6456         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6457         if (!tb)
6458                 goto err1;
6459
6460         if (attr) {
6461                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6462                                                   type->policy, NULL);
6463                 if (err < 0)
6464                         goto err2;
6465         } else {
6466                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6467         }
6468
6469         if (type->select_ops) {
6470                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6471                 if (IS_ERR(ops)) {
6472                         err = PTR_ERR(ops);
6473                         goto err2;
6474                 }
6475         } else {
6476                 ops = type->ops;
6477         }
6478
6479         err = -ENOMEM;
6480         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
6481         if (!obj)
6482                 goto err2;
6483
6484         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6485         if (err < 0)
6486                 goto err3;
6487
6488         obj->ops = ops;
6489
6490         kfree(tb);
6491         return obj;
6492 err3:
6493         kfree(obj);
6494 err2:
6495         kfree(tb);
6496 err1:
6497         return ERR_PTR(err);
6498 }
6499
6500 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6501                            struct nft_object *obj, bool reset)
6502 {
6503         struct nlattr *nest;
6504
6505         nest = nla_nest_start_noflag(skb, attr);
6506         if (!nest)
6507                 goto nla_put_failure;
6508         if (obj->ops->dump(skb, obj, reset) < 0)
6509                 goto nla_put_failure;
6510         nla_nest_end(skb, nest);
6511         return 0;
6512
6513 nla_put_failure:
6514         return -1;
6515 }
6516
6517 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6518 {
6519         const struct nft_object_type *type;
6520
6521         list_for_each_entry(type, &nf_tables_objects, list) {
6522                 if (objtype == type->type)
6523                         return type;
6524         }
6525         return NULL;
6526 }
6527
6528 static const struct nft_object_type *
6529 nft_obj_type_get(struct net *net, u32 objtype)
6530 {
6531         const struct nft_object_type *type;
6532
6533         type = __nft_obj_type_get(objtype);
6534         if (type != NULL && try_module_get(type->owner))
6535                 return type;
6536
6537         lockdep_nfnl_nft_mutex_not_held();
6538 #ifdef CONFIG_MODULES
6539         if (type == NULL) {
6540                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6541                         return ERR_PTR(-EAGAIN);
6542         }
6543 #endif
6544         return ERR_PTR(-ENOENT);
6545 }
6546
6547 static int nf_tables_updobj(const struct nft_ctx *ctx,
6548                             const struct nft_object_type *type,
6549                             const struct nlattr *attr,
6550                             struct nft_object *obj)
6551 {
6552         struct nft_object *newobj;
6553         struct nft_trans *trans;
6554         int err = -ENOMEM;
6555
6556         if (!try_module_get(type->owner))
6557                 return -ENOENT;
6558
6559         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6560                                 sizeof(struct nft_trans_obj));
6561         if (!trans)
6562                 goto err_trans;
6563
6564         newobj = nft_obj_init(ctx, type, attr);
6565         if (IS_ERR(newobj)) {
6566                 err = PTR_ERR(newobj);
6567                 goto err_free_trans;
6568         }
6569
6570         nft_trans_obj(trans) = obj;
6571         nft_trans_obj_update(trans) = true;
6572         nft_trans_obj_newobj(trans) = newobj;
6573         nft_trans_commit_list_add_tail(ctx->net, trans);
6574
6575         return 0;
6576
6577 err_free_trans:
6578         kfree(trans);
6579 err_trans:
6580         module_put(type->owner);
6581         return err;
6582 }
6583
6584 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
6585                             const struct nlattr * const nla[])
6586 {
6587         struct netlink_ext_ack *extack = info->extack;
6588         u8 genmask = nft_genmask_next(info->net);
6589         u8 family = info->nfmsg->nfgen_family;
6590         const struct nft_object_type *type;
6591         struct net *net = info->net;
6592         struct nft_table *table;
6593         struct nft_object *obj;
6594         struct nft_ctx ctx;
6595         u32 objtype;
6596         int err;
6597
6598         if (!nla[NFTA_OBJ_TYPE] ||
6599             !nla[NFTA_OBJ_NAME] ||
6600             !nla[NFTA_OBJ_DATA])
6601                 return -EINVAL;
6602
6603         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6604                                  NETLINK_CB(skb).portid);
6605         if (IS_ERR(table)) {
6606                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6607                 return PTR_ERR(table);
6608         }
6609
6610         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6611         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6612         if (IS_ERR(obj)) {
6613                 err = PTR_ERR(obj);
6614                 if (err != -ENOENT) {
6615                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6616                         return err;
6617                 }
6618         } else {
6619                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
6620                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6621                         return -EEXIST;
6622                 }
6623                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
6624                         return -EOPNOTSUPP;
6625
6626                 type = __nft_obj_type_get(objtype);
6627                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6628
6629                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6630         }
6631
6632         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6633
6634         type = nft_obj_type_get(net, objtype);
6635         if (IS_ERR(type))
6636                 return PTR_ERR(type);
6637
6638         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6639         if (IS_ERR(obj)) {
6640                 err = PTR_ERR(obj);
6641                 goto err_init;
6642         }
6643         obj->key.table = table;
6644         obj->handle = nf_tables_alloc_handle(table);
6645
6646         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
6647         if (!obj->key.name) {
6648                 err = -ENOMEM;
6649                 goto err_strdup;
6650         }
6651
6652         if (nla[NFTA_OBJ_USERDATA]) {
6653                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6654                 if (obj->udata == NULL)
6655                         goto err_userdata;
6656
6657                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6658         }
6659
6660         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6661         if (err < 0)
6662                 goto err_trans;
6663
6664         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6665                               nft_objname_ht_params);
6666         if (err < 0)
6667                 goto err_obj_ht;
6668
6669         list_add_tail_rcu(&obj->list, &table->objects);
6670         table->use++;
6671         return 0;
6672 err_obj_ht:
6673         /* queued in transaction log */
6674         INIT_LIST_HEAD(&obj->list);
6675         return err;
6676 err_trans:
6677         kfree(obj->udata);
6678 err_userdata:
6679         kfree(obj->key.name);
6680 err_strdup:
6681         if (obj->ops->destroy)
6682                 obj->ops->destroy(&ctx, obj);
6683         kfree(obj);
6684 err_init:
6685         module_put(type->owner);
6686         return err;
6687 }
6688
6689 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6690                                    u32 portid, u32 seq, int event, u32 flags,
6691                                    int family, const struct nft_table *table,
6692                                    struct nft_object *obj, bool reset)
6693 {
6694         struct nlmsghdr *nlh;
6695
6696         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6697         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
6698                            NFNETLINK_V0, nft_base_seq(net));
6699         if (!nlh)
6700                 goto nla_put_failure;
6701
6702         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6703             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6704             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6705             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6706             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6707             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6708                          NFTA_OBJ_PAD))
6709                 goto nla_put_failure;
6710
6711         if (obj->udata &&
6712             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6713                 goto nla_put_failure;
6714
6715         nlmsg_end(skb, nlh);
6716         return 0;
6717
6718 nla_put_failure:
6719         nlmsg_trim(skb, nlh);
6720         return -1;
6721 }
6722
6723 struct nft_obj_filter {
6724         char            *table;
6725         u32             type;
6726 };
6727
6728 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6729 {
6730         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6731         const struct nft_table *table;
6732         unsigned int idx = 0, s_idx = cb->args[0];
6733         struct nft_obj_filter *filter = cb->data;
6734         struct net *net = sock_net(skb->sk);
6735         int family = nfmsg->nfgen_family;
6736         struct nftables_pernet *nft_net;
6737         struct nft_object *obj;
6738         bool reset = false;
6739
6740         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6741                 reset = true;
6742
6743         rcu_read_lock();
6744         nft_net = nft_pernet(net);
6745         cb->seq = nft_net->base_seq;
6746
6747         list_for_each_entry_rcu(table, &nft_net->tables, list) {
6748                 if (family != NFPROTO_UNSPEC && family != table->family)
6749                         continue;
6750
6751                 list_for_each_entry_rcu(obj, &table->objects, list) {
6752                         if (!nft_is_active(net, obj))
6753                                 goto cont;
6754                         if (idx < s_idx)
6755                                 goto cont;
6756                         if (idx > s_idx)
6757                                 memset(&cb->args[1], 0,
6758                                        sizeof(cb->args) - sizeof(cb->args[0]));
6759                         if (filter && filter->table &&
6760                             strcmp(filter->table, table->name))
6761                                 goto cont;
6762                         if (filter &&
6763                             filter->type != NFT_OBJECT_UNSPEC &&
6764                             obj->ops->type->type != filter->type)
6765                                 goto cont;
6766                         if (reset) {
6767                                 char *buf = kasprintf(GFP_ATOMIC,
6768                                                       "%s:%u",
6769                                                       table->name,
6770                                                       nft_net->base_seq);
6771
6772                                 audit_log_nfcfg(buf,
6773                                                 family,
6774                                                 obj->handle,
6775                                                 AUDIT_NFT_OP_OBJ_RESET,
6776                                                 GFP_ATOMIC);
6777                                 kfree(buf);
6778                         }
6779
6780                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6781                                                     cb->nlh->nlmsg_seq,
6782                                                     NFT_MSG_NEWOBJ,
6783                                                     NLM_F_MULTI | NLM_F_APPEND,
6784                                                     table->family, table,
6785                                                     obj, reset) < 0)
6786                                 goto done;
6787
6788                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6789 cont:
6790                         idx++;
6791                 }
6792         }
6793 done:
6794         rcu_read_unlock();
6795
6796         cb->args[0] = idx;
6797         return skb->len;
6798 }
6799
6800 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6801 {
6802         const struct nlattr * const *nla = cb->data;
6803         struct nft_obj_filter *filter = NULL;
6804
6805         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6806                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6807                 if (!filter)
6808                         return -ENOMEM;
6809
6810                 if (nla[NFTA_OBJ_TABLE]) {
6811                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6812                         if (!filter->table) {
6813                                 kfree(filter);
6814                                 return -ENOMEM;
6815                         }
6816                 }
6817
6818                 if (nla[NFTA_OBJ_TYPE])
6819                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6820         }
6821
6822         cb->data = filter;
6823         return 0;
6824 }
6825
6826 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6827 {
6828         struct nft_obj_filter *filter = cb->data;
6829
6830         if (filter) {
6831                 kfree(filter->table);
6832                 kfree(filter);
6833         }
6834
6835         return 0;
6836 }
6837
6838 /* called with rcu_read_lock held */
6839 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
6840                             const struct nlattr * const nla[])
6841 {
6842         struct netlink_ext_ack *extack = info->extack;
6843         u8 genmask = nft_genmask_cur(info->net);
6844         u8 family = info->nfmsg->nfgen_family;
6845         const struct nft_table *table;
6846         struct net *net = info->net;
6847         struct nft_object *obj;
6848         struct sk_buff *skb2;
6849         bool reset = false;
6850         u32 objtype;
6851         int err;
6852
6853         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6854                 struct netlink_dump_control c = {
6855                         .start = nf_tables_dump_obj_start,
6856                         .dump = nf_tables_dump_obj,
6857                         .done = nf_tables_dump_obj_done,
6858                         .module = THIS_MODULE,
6859                         .data = (void *)nla,
6860                 };
6861
6862                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6863         }
6864
6865         if (!nla[NFTA_OBJ_NAME] ||
6866             !nla[NFTA_OBJ_TYPE])
6867                 return -EINVAL;
6868
6869         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
6870         if (IS_ERR(table)) {
6871                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6872                 return PTR_ERR(table);
6873         }
6874
6875         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6876         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6877         if (IS_ERR(obj)) {
6878                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6879                 return PTR_ERR(obj);
6880         }
6881
6882         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6883         if (!skb2)
6884                 return -ENOMEM;
6885
6886         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6887                 reset = true;
6888
6889         if (reset) {
6890                 const struct nftables_pernet *nft_net;
6891                 char *buf;
6892
6893                 nft_net = nft_pernet(net);
6894                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
6895
6896                 audit_log_nfcfg(buf,
6897                                 family,
6898                                 obj->handle,
6899                                 AUDIT_NFT_OP_OBJ_RESET,
6900                                 GFP_ATOMIC);
6901                 kfree(buf);
6902         }
6903
6904         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6905                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
6906                                       family, table, obj, reset);
6907         if (err < 0)
6908                 goto err_fill_obj_info;
6909
6910         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6911
6912 err_fill_obj_info:
6913         kfree_skb(skb2);
6914         return err;
6915 }
6916
6917 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
6918 {
6919         if (obj->ops->destroy)
6920                 obj->ops->destroy(ctx, obj);
6921
6922         module_put(obj->ops->type->owner);
6923         kfree(obj->key.name);
6924         kfree(obj->udata);
6925         kfree(obj);
6926 }
6927
6928 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
6929                             const struct nlattr * const nla[])
6930 {
6931         struct netlink_ext_ack *extack = info->extack;
6932         u8 genmask = nft_genmask_next(info->net);
6933         u8 family = info->nfmsg->nfgen_family;
6934         struct net *net = info->net;
6935         const struct nlattr *attr;
6936         struct nft_table *table;
6937         struct nft_object *obj;
6938         struct nft_ctx ctx;
6939         u32 objtype;
6940
6941         if (!nla[NFTA_OBJ_TYPE] ||
6942             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
6943                 return -EINVAL;
6944
6945         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6946                                  NETLINK_CB(skb).portid);
6947         if (IS_ERR(table)) {
6948                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6949                 return PTR_ERR(table);
6950         }
6951
6952         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6953         if (nla[NFTA_OBJ_HANDLE]) {
6954                 attr = nla[NFTA_OBJ_HANDLE];
6955                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
6956         } else {
6957                 attr = nla[NFTA_OBJ_NAME];
6958                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
6959         }
6960
6961         if (IS_ERR(obj)) {
6962                 NL_SET_BAD_ATTR(extack, attr);
6963                 return PTR_ERR(obj);
6964         }
6965         if (obj->use > 0) {
6966                 NL_SET_BAD_ATTR(extack, attr);
6967                 return -EBUSY;
6968         }
6969
6970         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6971
6972         return nft_delobj(&ctx, obj);
6973 }
6974
6975 void nft_obj_notify(struct net *net, const struct nft_table *table,
6976                     struct nft_object *obj, u32 portid, u32 seq, int event,
6977                     u16 flags, int family, int report, gfp_t gfp)
6978 {
6979         struct nftables_pernet *nft_net = nft_pernet(net);
6980         struct sk_buff *skb;
6981         int err;
6982         char *buf = kasprintf(gfp, "%s:%u",
6983                               table->name, nft_net->base_seq);
6984
6985         audit_log_nfcfg(buf,
6986                         family,
6987                         obj->handle,
6988                         event == NFT_MSG_NEWOBJ ?
6989                                  AUDIT_NFT_OP_OBJ_REGISTER :
6990                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
6991                         gfp);
6992         kfree(buf);
6993
6994         if (!report &&
6995             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6996                 return;
6997
6998         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
6999         if (skb == NULL)
7000                 goto err;
7001
7002         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7003                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7004                                       family, table, obj, false);
7005         if (err < 0) {
7006                 kfree_skb(skb);
7007                 goto err;
7008         }
7009
7010         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7011         return;
7012 err:
7013         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7014 }
7015 EXPORT_SYMBOL_GPL(nft_obj_notify);
7016
7017 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7018                                  struct nft_object *obj, int event)
7019 {
7020         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7021                        ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7022 }
7023
7024 /*
7025  * Flow tables
7026  */
7027 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7028 {
7029         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7030         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7031         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7032 }
7033 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7034
7035 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7036 {
7037         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7038         list_del_rcu(&type->list);
7039         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7040 }
7041 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7042
7043 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7044         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7045                                             .len = NFT_NAME_MAXLEN - 1 },
7046         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7047                                             .len = NFT_NAME_MAXLEN - 1 },
7048         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7049         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7050         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7051 };
7052
7053 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7054                                            const struct nlattr *nla, u8 genmask)
7055 {
7056         struct nft_flowtable *flowtable;
7057
7058         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7059                 if (!nla_strcmp(nla, flowtable->name) &&
7060                     nft_active_genmask(flowtable, genmask))
7061                         return flowtable;
7062         }
7063         return ERR_PTR(-ENOENT);
7064 }
7065 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7066
7067 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7068                                     struct nft_flowtable *flowtable,
7069                                     enum nft_trans_phase phase)
7070 {
7071         switch (phase) {
7072         case NFT_TRANS_PREPARE:
7073         case NFT_TRANS_ABORT:
7074         case NFT_TRANS_RELEASE:
7075                 flowtable->use--;
7076                 fallthrough;
7077         default:
7078                 return;
7079         }
7080 }
7081 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7082
7083 static struct nft_flowtable *
7084 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7085                               const struct nlattr *nla, u8 genmask)
7086 {
7087        struct nft_flowtable *flowtable;
7088
7089        list_for_each_entry(flowtable, &table->flowtables, list) {
7090                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7091                    nft_active_genmask(flowtable, genmask))
7092                        return flowtable;
7093        }
7094        return ERR_PTR(-ENOENT);
7095 }
7096
7097 struct nft_flowtable_hook {
7098         u32                     num;
7099         int                     priority;
7100         struct list_head        list;
7101 };
7102
7103 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7104         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
7105         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
7106         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
7107 };
7108
7109 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7110                                     const struct nlattr *attr,
7111                                     struct nft_flowtable_hook *flowtable_hook,
7112                                     struct nft_flowtable *flowtable, bool add)
7113 {
7114         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7115         struct nft_hook *hook;
7116         int hooknum, priority;
7117         int err;
7118
7119         INIT_LIST_HEAD(&flowtable_hook->list);
7120
7121         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7122                                           nft_flowtable_hook_policy, NULL);
7123         if (err < 0)
7124                 return err;
7125
7126         if (add) {
7127                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7128                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7129                         return -EINVAL;
7130
7131                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7132                 if (hooknum != NF_NETDEV_INGRESS)
7133                         return -EOPNOTSUPP;
7134
7135                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7136
7137                 flowtable_hook->priority        = priority;
7138                 flowtable_hook->num             = hooknum;
7139         } else {
7140                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7141                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7142                         if (hooknum != flowtable->hooknum)
7143                                 return -EOPNOTSUPP;
7144                 }
7145
7146                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7147                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7148                         if (priority != flowtable->data.priority)
7149                                 return -EOPNOTSUPP;
7150                 }
7151
7152                 flowtable_hook->priority        = flowtable->data.priority;
7153                 flowtable_hook->num             = flowtable->hooknum;
7154         }
7155
7156         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7157                 err = nf_tables_parse_netdev_hooks(ctx->net,
7158                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
7159                                                    &flowtable_hook->list);
7160                 if (err < 0)
7161                         return err;
7162         }
7163
7164         list_for_each_entry(hook, &flowtable_hook->list, list) {
7165                 hook->ops.pf            = NFPROTO_NETDEV;
7166                 hook->ops.hooknum       = flowtable_hook->num;
7167                 hook->ops.priority      = flowtable_hook->priority;
7168                 hook->ops.priv          = &flowtable->data;
7169                 hook->ops.hook          = flowtable->data.type->hook;
7170         }
7171
7172         return err;
7173 }
7174
7175 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7176 {
7177         const struct nf_flowtable_type *type;
7178
7179         list_for_each_entry(type, &nf_tables_flowtables, list) {
7180                 if (family == type->family)
7181                         return type;
7182         }
7183         return NULL;
7184 }
7185
7186 static const struct nf_flowtable_type *
7187 nft_flowtable_type_get(struct net *net, u8 family)
7188 {
7189         const struct nf_flowtable_type *type;
7190
7191         type = __nft_flowtable_type_get(family);
7192         if (type != NULL && try_module_get(type->owner))
7193                 return type;
7194
7195         lockdep_nfnl_nft_mutex_not_held();
7196 #ifdef CONFIG_MODULES
7197         if (type == NULL) {
7198                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7199                         return ERR_PTR(-EAGAIN);
7200         }
7201 #endif
7202         return ERR_PTR(-ENOENT);
7203 }
7204
7205 /* Only called from error and netdev event paths. */
7206 static void nft_unregister_flowtable_hook(struct net *net,
7207                                           struct nft_flowtable *flowtable,
7208                                           struct nft_hook *hook)
7209 {
7210         nf_unregister_net_hook(net, &hook->ops);
7211         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7212                                     FLOW_BLOCK_UNBIND);
7213 }
7214
7215 static void nft_unregister_flowtable_net_hooks(struct net *net,
7216                                                struct list_head *hook_list)
7217 {
7218         struct nft_hook *hook;
7219
7220         list_for_each_entry(hook, hook_list, list)
7221                 nf_unregister_net_hook(net, &hook->ops);
7222 }
7223
7224 static int nft_register_flowtable_net_hooks(struct net *net,
7225                                             struct nft_table *table,
7226                                             struct list_head *hook_list,
7227                                             struct nft_flowtable *flowtable)
7228 {
7229         struct nft_hook *hook, *hook2, *next;
7230         struct nft_flowtable *ft;
7231         int err, i = 0;
7232
7233         list_for_each_entry(hook, hook_list, list) {
7234                 list_for_each_entry(ft, &table->flowtables, list) {
7235                         if (!nft_is_active_next(net, ft))
7236                                 continue;
7237
7238                         list_for_each_entry(hook2, &ft->hook_list, list) {
7239                                 if (hook->ops.dev == hook2->ops.dev &&
7240                                     hook->ops.pf == hook2->ops.pf) {
7241                                         err = -EEXIST;
7242                                         goto err_unregister_net_hooks;
7243                                 }
7244                         }
7245                 }
7246
7247                 err = flowtable->data.type->setup(&flowtable->data,
7248                                                   hook->ops.dev,
7249                                                   FLOW_BLOCK_BIND);
7250                 if (err < 0)
7251                         goto err_unregister_net_hooks;
7252
7253                 err = nf_register_net_hook(net, &hook->ops);
7254                 if (err < 0) {
7255                         flowtable->data.type->setup(&flowtable->data,
7256                                                     hook->ops.dev,
7257                                                     FLOW_BLOCK_UNBIND);
7258                         goto err_unregister_net_hooks;
7259                 }
7260
7261                 i++;
7262         }
7263
7264         return 0;
7265
7266 err_unregister_net_hooks:
7267         list_for_each_entry_safe(hook, next, hook_list, list) {
7268                 if (i-- <= 0)
7269                         break;
7270
7271                 nft_unregister_flowtable_hook(net, flowtable, hook);
7272                 list_del_rcu(&hook->list);
7273                 kfree_rcu(hook, rcu);
7274         }
7275
7276         return err;
7277 }
7278
7279 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7280 {
7281         struct nft_hook *hook, *next;
7282
7283         list_for_each_entry_safe(hook, next, hook_list, list) {
7284                 list_del_rcu(&hook->list);
7285                 kfree_rcu(hook, rcu);
7286         }
7287 }
7288
7289 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7290                                 struct nft_flowtable *flowtable)
7291 {
7292         const struct nlattr * const *nla = ctx->nla;
7293         struct nft_flowtable_hook flowtable_hook;
7294         struct nft_hook *hook, *next;
7295         struct nft_trans *trans;
7296         bool unregister = false;
7297         u32 flags;
7298         int err;
7299
7300         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7301                                        &flowtable_hook, flowtable, false);
7302         if (err < 0)
7303                 return err;
7304
7305         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7306                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7307                         list_del(&hook->list);
7308                         kfree(hook);
7309                 }
7310         }
7311
7312         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7313                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7314                 if (flags & ~NFT_FLOWTABLE_MASK)
7315                         return -EOPNOTSUPP;
7316                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7317                     (flags & NFT_FLOWTABLE_HW_OFFLOAD))
7318                         return -EOPNOTSUPP;
7319         } else {
7320                 flags = flowtable->data.flags;
7321         }
7322
7323         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7324                                                &flowtable_hook.list, flowtable);
7325         if (err < 0)
7326                 goto err_flowtable_update_hook;
7327
7328         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7329                                 sizeof(struct nft_trans_flowtable));
7330         if (!trans) {
7331                 unregister = true;
7332                 err = -ENOMEM;
7333                 goto err_flowtable_update_hook;
7334         }
7335
7336         nft_trans_flowtable_flags(trans) = flags;
7337         nft_trans_flowtable(trans) = flowtable;
7338         nft_trans_flowtable_update(trans) = true;
7339         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7340         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7341
7342         nft_trans_commit_list_add_tail(ctx->net, trans);
7343
7344         return 0;
7345
7346 err_flowtable_update_hook:
7347         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7348                 if (unregister)
7349                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7350                 list_del_rcu(&hook->list);
7351                 kfree_rcu(hook, rcu);
7352         }
7353
7354         return err;
7355
7356 }
7357
7358 static int nf_tables_newflowtable(struct sk_buff *skb,
7359                                   const struct nfnl_info *info,
7360                                   const struct nlattr * const nla[])
7361 {
7362         struct netlink_ext_ack *extack = info->extack;
7363         struct nft_flowtable_hook flowtable_hook;
7364         u8 genmask = nft_genmask_next(info->net);
7365         u8 family = info->nfmsg->nfgen_family;
7366         const struct nf_flowtable_type *type;
7367         struct nft_flowtable *flowtable;
7368         struct nft_hook *hook, *next;
7369         struct net *net = info->net;
7370         struct nft_table *table;
7371         struct nft_ctx ctx;
7372         int err;
7373
7374         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7375             !nla[NFTA_FLOWTABLE_NAME] ||
7376             !nla[NFTA_FLOWTABLE_HOOK])
7377                 return -EINVAL;
7378
7379         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7380                                  genmask, NETLINK_CB(skb).portid);
7381         if (IS_ERR(table)) {
7382                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7383                 return PTR_ERR(table);
7384         }
7385
7386         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7387                                          genmask);
7388         if (IS_ERR(flowtable)) {
7389                 err = PTR_ERR(flowtable);
7390                 if (err != -ENOENT) {
7391                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7392                         return err;
7393                 }
7394         } else {
7395                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7396                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7397                         return -EEXIST;
7398                 }
7399
7400                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7401
7402                 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7403         }
7404
7405         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7406
7407         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
7408         if (!flowtable)
7409                 return -ENOMEM;
7410
7411         flowtable->table = table;
7412         flowtable->handle = nf_tables_alloc_handle(table);
7413         INIT_LIST_HEAD(&flowtable->hook_list);
7414
7415         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
7416         if (!flowtable->name) {
7417                 err = -ENOMEM;
7418                 goto err1;
7419         }
7420
7421         type = nft_flowtable_type_get(net, family);
7422         if (IS_ERR(type)) {
7423                 err = PTR_ERR(type);
7424                 goto err2;
7425         }
7426
7427         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7428                 flowtable->data.flags =
7429                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7430                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7431                         err = -EOPNOTSUPP;
7432                         goto err3;
7433                 }
7434         }
7435
7436         write_pnet(&flowtable->data.net, net);
7437         flowtable->data.type = type;
7438         err = type->init(&flowtable->data);
7439         if (err < 0)
7440                 goto err3;
7441
7442         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7443                                        &flowtable_hook, flowtable, true);
7444         if (err < 0)
7445                 goto err4;
7446
7447         list_splice(&flowtable_hook.list, &flowtable->hook_list);
7448         flowtable->data.priority = flowtable_hook.priority;
7449         flowtable->hooknum = flowtable_hook.num;
7450
7451         err = nft_register_flowtable_net_hooks(ctx.net, table,
7452                                                &flowtable->hook_list,
7453                                                flowtable);
7454         if (err < 0) {
7455                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7456                 goto err4;
7457         }
7458
7459         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7460         if (err < 0)
7461                 goto err5;
7462
7463         list_add_tail_rcu(&flowtable->list, &table->flowtables);
7464         table->use++;
7465
7466         return 0;
7467 err5:
7468         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7469                 nft_unregister_flowtable_hook(net, flowtable, hook);
7470                 list_del_rcu(&hook->list);
7471                 kfree_rcu(hook, rcu);
7472         }
7473 err4:
7474         flowtable->data.type->free(&flowtable->data);
7475 err3:
7476         module_put(type->owner);
7477 err2:
7478         kfree(flowtable->name);
7479 err1:
7480         kfree(flowtable);
7481         return err;
7482 }
7483
7484 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7485 {
7486         struct nft_hook *this, *next;
7487
7488         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7489                 list_del(&this->list);
7490                 kfree(this);
7491         }
7492 }
7493
7494 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7495                                  struct nft_flowtable *flowtable)
7496 {
7497         const struct nlattr * const *nla = ctx->nla;
7498         struct nft_flowtable_hook flowtable_hook;
7499         struct nft_hook *this, *hook;
7500         struct nft_trans *trans;
7501         int err;
7502
7503         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7504                                        &flowtable_hook, flowtable, false);
7505         if (err < 0)
7506                 return err;
7507
7508         list_for_each_entry(this, &flowtable_hook.list, list) {
7509                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7510                 if (!hook) {
7511                         err = -ENOENT;
7512                         goto err_flowtable_del_hook;
7513                 }
7514                 hook->inactive = true;
7515         }
7516
7517         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7518                                 sizeof(struct nft_trans_flowtable));
7519         if (!trans) {
7520                 err = -ENOMEM;
7521                 goto err_flowtable_del_hook;
7522         }
7523
7524         nft_trans_flowtable(trans) = flowtable;
7525         nft_trans_flowtable_update(trans) = true;
7526         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7527         nft_flowtable_hook_release(&flowtable_hook);
7528
7529         nft_trans_commit_list_add_tail(ctx->net, trans);
7530
7531         return 0;
7532
7533 err_flowtable_del_hook:
7534         list_for_each_entry(this, &flowtable_hook.list, list) {
7535                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7536                 if (!hook)
7537                         break;
7538
7539                 hook->inactive = false;
7540         }
7541         nft_flowtable_hook_release(&flowtable_hook);
7542
7543         return err;
7544 }
7545
7546 static int nf_tables_delflowtable(struct sk_buff *skb,
7547                                   const struct nfnl_info *info,
7548                                   const struct nlattr * const nla[])
7549 {
7550         struct netlink_ext_ack *extack = info->extack;
7551         u8 genmask = nft_genmask_next(info->net);
7552         u8 family = info->nfmsg->nfgen_family;
7553         struct nft_flowtable *flowtable;
7554         struct net *net = info->net;
7555         const struct nlattr *attr;
7556         struct nft_table *table;
7557         struct nft_ctx ctx;
7558
7559         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7560             (!nla[NFTA_FLOWTABLE_NAME] &&
7561              !nla[NFTA_FLOWTABLE_HANDLE]))
7562                 return -EINVAL;
7563
7564         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7565                                  genmask, NETLINK_CB(skb).portid);
7566         if (IS_ERR(table)) {
7567                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7568                 return PTR_ERR(table);
7569         }
7570
7571         if (nla[NFTA_FLOWTABLE_HANDLE]) {
7572                 attr = nla[NFTA_FLOWTABLE_HANDLE];
7573                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7574         } else {
7575                 attr = nla[NFTA_FLOWTABLE_NAME];
7576                 flowtable = nft_flowtable_lookup(table, attr, genmask);
7577         }
7578
7579         if (IS_ERR(flowtable)) {
7580                 NL_SET_BAD_ATTR(extack, attr);
7581                 return PTR_ERR(flowtable);
7582         }
7583
7584         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7585
7586         if (nla[NFTA_FLOWTABLE_HOOK])
7587                 return nft_delflowtable_hook(&ctx, flowtable);
7588
7589         if (flowtable->use > 0) {
7590                 NL_SET_BAD_ATTR(extack, attr);
7591                 return -EBUSY;
7592         }
7593
7594         return nft_delflowtable(&ctx, flowtable);
7595 }
7596
7597 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7598                                          u32 portid, u32 seq, int event,
7599                                          u32 flags, int family,
7600                                          struct nft_flowtable *flowtable,
7601                                          struct list_head *hook_list)
7602 {
7603         struct nlattr *nest, *nest_devs;
7604         struct nft_hook *hook;
7605         struct nlmsghdr *nlh;
7606
7607         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7608         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7609                            NFNETLINK_V0, nft_base_seq(net));
7610         if (!nlh)
7611                 goto nla_put_failure;
7612
7613         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7614             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7615             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7616             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7617                          NFTA_FLOWTABLE_PAD) ||
7618             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7619                 goto nla_put_failure;
7620
7621         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7622         if (!nest)
7623                 goto nla_put_failure;
7624         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7625             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7626                 goto nla_put_failure;
7627
7628         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7629         if (!nest_devs)
7630                 goto nla_put_failure;
7631
7632         list_for_each_entry_rcu(hook, hook_list, list) {
7633                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7634                         goto nla_put_failure;
7635         }
7636         nla_nest_end(skb, nest_devs);
7637         nla_nest_end(skb, nest);
7638
7639         nlmsg_end(skb, nlh);
7640         return 0;
7641
7642 nla_put_failure:
7643         nlmsg_trim(skb, nlh);
7644         return -1;
7645 }
7646
7647 struct nft_flowtable_filter {
7648         char            *table;
7649 };
7650
7651 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7652                                     struct netlink_callback *cb)
7653 {
7654         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7655         struct nft_flowtable_filter *filter = cb->data;
7656         unsigned int idx = 0, s_idx = cb->args[0];
7657         struct net *net = sock_net(skb->sk);
7658         int family = nfmsg->nfgen_family;
7659         struct nft_flowtable *flowtable;
7660         struct nftables_pernet *nft_net;
7661         const struct nft_table *table;
7662
7663         rcu_read_lock();
7664         nft_net = nft_pernet(net);
7665         cb->seq = nft_net->base_seq;
7666
7667         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7668                 if (family != NFPROTO_UNSPEC && family != table->family)
7669                         continue;
7670
7671                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7672                         if (!nft_is_active(net, flowtable))
7673                                 goto cont;
7674                         if (idx < s_idx)
7675                                 goto cont;
7676                         if (idx > s_idx)
7677                                 memset(&cb->args[1], 0,
7678                                        sizeof(cb->args) - sizeof(cb->args[0]));
7679                         if (filter && filter->table &&
7680                             strcmp(filter->table, table->name))
7681                                 goto cont;
7682
7683                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7684                                                           cb->nlh->nlmsg_seq,
7685                                                           NFT_MSG_NEWFLOWTABLE,
7686                                                           NLM_F_MULTI | NLM_F_APPEND,
7687                                                           table->family,
7688                                                           flowtable,
7689                                                           &flowtable->hook_list) < 0)
7690                                 goto done;
7691
7692                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7693 cont:
7694                         idx++;
7695                 }
7696         }
7697 done:
7698         rcu_read_unlock();
7699
7700         cb->args[0] = idx;
7701         return skb->len;
7702 }
7703
7704 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7705 {
7706         const struct nlattr * const *nla = cb->data;
7707         struct nft_flowtable_filter *filter = NULL;
7708
7709         if (nla[NFTA_FLOWTABLE_TABLE]) {
7710                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7711                 if (!filter)
7712                         return -ENOMEM;
7713
7714                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7715                                            GFP_ATOMIC);
7716                 if (!filter->table) {
7717                         kfree(filter);
7718                         return -ENOMEM;
7719                 }
7720         }
7721
7722         cb->data = filter;
7723         return 0;
7724 }
7725
7726 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7727 {
7728         struct nft_flowtable_filter *filter = cb->data;
7729
7730         if (!filter)
7731                 return 0;
7732
7733         kfree(filter->table);
7734         kfree(filter);
7735
7736         return 0;
7737 }
7738
7739 /* called with rcu_read_lock held */
7740 static int nf_tables_getflowtable(struct sk_buff *skb,
7741                                   const struct nfnl_info *info,
7742                                   const struct nlattr * const nla[])
7743 {
7744         u8 genmask = nft_genmask_cur(info->net);
7745         u8 family = info->nfmsg->nfgen_family;
7746         struct nft_flowtable *flowtable;
7747         const struct nft_table *table;
7748         struct net *net = info->net;
7749         struct sk_buff *skb2;
7750         int err;
7751
7752         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7753                 struct netlink_dump_control c = {
7754                         .start = nf_tables_dump_flowtable_start,
7755                         .dump = nf_tables_dump_flowtable,
7756                         .done = nf_tables_dump_flowtable_done,
7757                         .module = THIS_MODULE,
7758                         .data = (void *)nla,
7759                 };
7760
7761                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7762         }
7763
7764         if (!nla[NFTA_FLOWTABLE_NAME])
7765                 return -EINVAL;
7766
7767         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7768                                  genmask, 0);
7769         if (IS_ERR(table))
7770                 return PTR_ERR(table);
7771
7772         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7773                                          genmask);
7774         if (IS_ERR(flowtable))
7775                 return PTR_ERR(flowtable);
7776
7777         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7778         if (!skb2)
7779                 return -ENOMEM;
7780
7781         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7782                                             info->nlh->nlmsg_seq,
7783                                             NFT_MSG_NEWFLOWTABLE, 0, family,
7784                                             flowtable, &flowtable->hook_list);
7785         if (err < 0)
7786                 goto err_fill_flowtable_info;
7787
7788         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7789
7790 err_fill_flowtable_info:
7791         kfree_skb(skb2);
7792         return err;
7793 }
7794
7795 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7796                                        struct nft_flowtable *flowtable,
7797                                        struct list_head *hook_list,
7798                                        int event)
7799 {
7800         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
7801         struct sk_buff *skb;
7802         u16 flags = 0;
7803         int err;
7804
7805         if (!ctx->report &&
7806             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7807                 return;
7808
7809         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7810         if (skb == NULL)
7811                 goto err;
7812
7813         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
7814                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
7815
7816         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7817                                             ctx->seq, event, flags,
7818                                             ctx->family, flowtable, hook_list);
7819         if (err < 0) {
7820                 kfree_skb(skb);
7821                 goto err;
7822         }
7823
7824         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
7825         return;
7826 err:
7827         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7828 }
7829
7830 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7831 {
7832         struct nft_hook *hook, *next;
7833
7834         flowtable->data.type->free(&flowtable->data);
7835         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7836                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7837                                             FLOW_BLOCK_UNBIND);
7838                 list_del_rcu(&hook->list);
7839                 kfree(hook);
7840         }
7841         kfree(flowtable->name);
7842         module_put(flowtable->data.type->owner);
7843         kfree(flowtable);
7844 }
7845
7846 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7847                                    u32 portid, u32 seq)
7848 {
7849         struct nftables_pernet *nft_net = nft_pernet(net);
7850         struct nlmsghdr *nlh;
7851         char buf[TASK_COMM_LEN];
7852         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7853
7854         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
7855                            NFNETLINK_V0, nft_base_seq(net));
7856         if (!nlh)
7857                 goto nla_put_failure;
7858
7859         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
7860             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7861             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7862                 goto nla_put_failure;
7863
7864         nlmsg_end(skb, nlh);
7865         return 0;
7866
7867 nla_put_failure:
7868         nlmsg_trim(skb, nlh);
7869         return -EMSGSIZE;
7870 }
7871
7872 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7873                                 struct nft_flowtable *flowtable)
7874 {
7875         struct nft_hook *hook;
7876
7877         list_for_each_entry(hook, &flowtable->hook_list, list) {
7878                 if (hook->ops.dev != dev)
7879                         continue;
7880
7881                 /* flow_offload_netdev_event() cleans up entries for us. */
7882                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
7883                 list_del_rcu(&hook->list);
7884                 kfree_rcu(hook, rcu);
7885                 break;
7886         }
7887 }
7888
7889 static int nf_tables_flowtable_event(struct notifier_block *this,
7890                                      unsigned long event, void *ptr)
7891 {
7892         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7893         struct nft_flowtable *flowtable;
7894         struct nftables_pernet *nft_net;
7895         struct nft_table *table;
7896         struct net *net;
7897
7898         if (event != NETDEV_UNREGISTER)
7899                 return 0;
7900
7901         net = dev_net(dev);
7902         nft_net = nft_pernet(net);
7903         mutex_lock(&nft_net->commit_mutex);
7904         list_for_each_entry(table, &nft_net->tables, list) {
7905                 list_for_each_entry(flowtable, &table->flowtables, list) {
7906                         nft_flowtable_event(event, dev, flowtable);
7907                 }
7908         }
7909         mutex_unlock(&nft_net->commit_mutex);
7910
7911         return NOTIFY_DONE;
7912 }
7913
7914 static struct notifier_block nf_tables_flowtable_notifier = {
7915         .notifier_call  = nf_tables_flowtable_event,
7916 };
7917
7918 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
7919                                  int event)
7920 {
7921         struct nlmsghdr *nlh = nlmsg_hdr(skb);
7922         struct sk_buff *skb2;
7923         int err;
7924
7925         if (!nlmsg_report(nlh) &&
7926             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7927                 return;
7928
7929         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7930         if (skb2 == NULL)
7931                 goto err;
7932
7933         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7934                                       nlh->nlmsg_seq);
7935         if (err < 0) {
7936                 kfree_skb(skb2);
7937                 goto err;
7938         }
7939
7940         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7941                        nlmsg_report(nlh), GFP_KERNEL);
7942         return;
7943 err:
7944         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7945                           -ENOBUFS);
7946 }
7947
7948 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
7949                             const struct nlattr * const nla[])
7950 {
7951         struct sk_buff *skb2;
7952         int err;
7953
7954         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7955         if (skb2 == NULL)
7956                 return -ENOMEM;
7957
7958         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
7959                                       info->nlh->nlmsg_seq);
7960         if (err < 0)
7961                 goto err_fill_gen_info;
7962
7963         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
7964
7965 err_fill_gen_info:
7966         kfree_skb(skb2);
7967         return err;
7968 }
7969
7970 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
7971         [NFT_MSG_NEWTABLE] = {
7972                 .call           = nf_tables_newtable,
7973                 .type           = NFNL_CB_BATCH,
7974                 .attr_count     = NFTA_TABLE_MAX,
7975                 .policy         = nft_table_policy,
7976         },
7977         [NFT_MSG_GETTABLE] = {
7978                 .call           = nf_tables_gettable,
7979                 .type           = NFNL_CB_RCU,
7980                 .attr_count     = NFTA_TABLE_MAX,
7981                 .policy         = nft_table_policy,
7982         },
7983         [NFT_MSG_DELTABLE] = {
7984                 .call           = nf_tables_deltable,
7985                 .type           = NFNL_CB_BATCH,
7986                 .attr_count     = NFTA_TABLE_MAX,
7987                 .policy         = nft_table_policy,
7988         },
7989         [NFT_MSG_NEWCHAIN] = {
7990                 .call           = nf_tables_newchain,
7991                 .type           = NFNL_CB_BATCH,
7992                 .attr_count     = NFTA_CHAIN_MAX,
7993                 .policy         = nft_chain_policy,
7994         },
7995         [NFT_MSG_GETCHAIN] = {
7996                 .call           = nf_tables_getchain,
7997                 .type           = NFNL_CB_RCU,
7998                 .attr_count     = NFTA_CHAIN_MAX,
7999                 .policy         = nft_chain_policy,
8000         },
8001         [NFT_MSG_DELCHAIN] = {
8002                 .call           = nf_tables_delchain,
8003                 .type           = NFNL_CB_BATCH,
8004                 .attr_count     = NFTA_CHAIN_MAX,
8005                 .policy         = nft_chain_policy,
8006         },
8007         [NFT_MSG_NEWRULE] = {
8008                 .call           = nf_tables_newrule,
8009                 .type           = NFNL_CB_BATCH,
8010                 .attr_count     = NFTA_RULE_MAX,
8011                 .policy         = nft_rule_policy,
8012         },
8013         [NFT_MSG_GETRULE] = {
8014                 .call           = nf_tables_getrule,
8015                 .type           = NFNL_CB_RCU,
8016                 .attr_count     = NFTA_RULE_MAX,
8017                 .policy         = nft_rule_policy,
8018         },
8019         [NFT_MSG_DELRULE] = {
8020                 .call           = nf_tables_delrule,
8021                 .type           = NFNL_CB_BATCH,
8022                 .attr_count     = NFTA_RULE_MAX,
8023                 .policy         = nft_rule_policy,
8024         },
8025         [NFT_MSG_NEWSET] = {
8026                 .call           = nf_tables_newset,
8027                 .type           = NFNL_CB_BATCH,
8028                 .attr_count     = NFTA_SET_MAX,
8029                 .policy         = nft_set_policy,
8030         },
8031         [NFT_MSG_GETSET] = {
8032                 .call           = nf_tables_getset,
8033                 .type           = NFNL_CB_RCU,
8034                 .attr_count     = NFTA_SET_MAX,
8035                 .policy         = nft_set_policy,
8036         },
8037         [NFT_MSG_DELSET] = {
8038                 .call           = nf_tables_delset,
8039                 .type           = NFNL_CB_BATCH,
8040                 .attr_count     = NFTA_SET_MAX,
8041                 .policy         = nft_set_policy,
8042         },
8043         [NFT_MSG_NEWSETELEM] = {
8044                 .call           = nf_tables_newsetelem,
8045                 .type           = NFNL_CB_BATCH,
8046                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8047                 .policy         = nft_set_elem_list_policy,
8048         },
8049         [NFT_MSG_GETSETELEM] = {
8050                 .call           = nf_tables_getsetelem,
8051                 .type           = NFNL_CB_RCU,
8052                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8053                 .policy         = nft_set_elem_list_policy,
8054         },
8055         [NFT_MSG_DELSETELEM] = {
8056                 .call           = nf_tables_delsetelem,
8057                 .type           = NFNL_CB_BATCH,
8058                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8059                 .policy         = nft_set_elem_list_policy,
8060         },
8061         [NFT_MSG_GETGEN] = {
8062                 .call           = nf_tables_getgen,
8063                 .type           = NFNL_CB_RCU,
8064         },
8065         [NFT_MSG_NEWOBJ] = {
8066                 .call           = nf_tables_newobj,
8067                 .type           = NFNL_CB_BATCH,
8068                 .attr_count     = NFTA_OBJ_MAX,
8069                 .policy         = nft_obj_policy,
8070         },
8071         [NFT_MSG_GETOBJ] = {
8072                 .call           = nf_tables_getobj,
8073                 .type           = NFNL_CB_RCU,
8074                 .attr_count     = NFTA_OBJ_MAX,
8075                 .policy         = nft_obj_policy,
8076         },
8077         [NFT_MSG_DELOBJ] = {
8078                 .call           = nf_tables_delobj,
8079                 .type           = NFNL_CB_BATCH,
8080                 .attr_count     = NFTA_OBJ_MAX,
8081                 .policy         = nft_obj_policy,
8082         },
8083         [NFT_MSG_GETOBJ_RESET] = {
8084                 .call           = nf_tables_getobj,
8085                 .type           = NFNL_CB_RCU,
8086                 .attr_count     = NFTA_OBJ_MAX,
8087                 .policy         = nft_obj_policy,
8088         },
8089         [NFT_MSG_NEWFLOWTABLE] = {
8090                 .call           = nf_tables_newflowtable,
8091                 .type           = NFNL_CB_BATCH,
8092                 .attr_count     = NFTA_FLOWTABLE_MAX,
8093                 .policy         = nft_flowtable_policy,
8094         },
8095         [NFT_MSG_GETFLOWTABLE] = {
8096                 .call           = nf_tables_getflowtable,
8097                 .type           = NFNL_CB_RCU,
8098                 .attr_count     = NFTA_FLOWTABLE_MAX,
8099                 .policy         = nft_flowtable_policy,
8100         },
8101         [NFT_MSG_DELFLOWTABLE] = {
8102                 .call           = nf_tables_delflowtable,
8103                 .type           = NFNL_CB_BATCH,
8104                 .attr_count     = NFTA_FLOWTABLE_MAX,
8105                 .policy         = nft_flowtable_policy,
8106         },
8107 };
8108
8109 static int nf_tables_validate(struct net *net)
8110 {
8111         struct nftables_pernet *nft_net = nft_pernet(net);
8112         struct nft_table *table;
8113
8114         switch (nft_net->validate_state) {
8115         case NFT_VALIDATE_SKIP:
8116                 break;
8117         case NFT_VALIDATE_NEED:
8118                 nft_validate_state_update(net, NFT_VALIDATE_DO);
8119                 fallthrough;
8120         case NFT_VALIDATE_DO:
8121                 list_for_each_entry(table, &nft_net->tables, list) {
8122                         if (nft_table_validate(net, table) < 0)
8123                                 return -EAGAIN;
8124                 }
8125                 break;
8126         }
8127
8128         return 0;
8129 }
8130
8131 /* a drop policy has to be deferred until all rules have been activated,
8132  * otherwise a large ruleset that contains a drop-policy base chain will
8133  * cause all packets to get dropped until the full transaction has been
8134  * processed.
8135  *
8136  * We defer the drop policy until the transaction has been finalized.
8137  */
8138 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8139 {
8140         struct nft_base_chain *basechain;
8141
8142         if (nft_trans_chain_policy(trans) != NF_DROP)
8143                 return;
8144
8145         if (!nft_is_base_chain(trans->ctx.chain))
8146                 return;
8147
8148         basechain = nft_base_chain(trans->ctx.chain);
8149         basechain->policy = NF_DROP;
8150 }
8151
8152 static void nft_chain_commit_update(struct nft_trans *trans)
8153 {
8154         struct nft_base_chain *basechain;
8155
8156         if (nft_trans_chain_name(trans)) {
8157                 rhltable_remove(&trans->ctx.table->chains_ht,
8158                                 &trans->ctx.chain->rhlhead,
8159                                 nft_chain_ht_params);
8160                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8161                 rhltable_insert_key(&trans->ctx.table->chains_ht,
8162                                     trans->ctx.chain->name,
8163                                     &trans->ctx.chain->rhlhead,
8164                                     nft_chain_ht_params);
8165         }
8166
8167         if (!nft_is_base_chain(trans->ctx.chain))
8168                 return;
8169
8170         nft_chain_stats_replace(trans);
8171
8172         basechain = nft_base_chain(trans->ctx.chain);
8173
8174         switch (nft_trans_chain_policy(trans)) {
8175         case NF_DROP:
8176         case NF_ACCEPT:
8177                 basechain->policy = nft_trans_chain_policy(trans);
8178                 break;
8179         }
8180 }
8181
8182 static void nft_obj_commit_update(struct nft_trans *trans)
8183 {
8184         struct nft_object *newobj;
8185         struct nft_object *obj;
8186
8187         obj = nft_trans_obj(trans);
8188         newobj = nft_trans_obj_newobj(trans);
8189
8190         if (obj->ops->update)
8191                 obj->ops->update(obj, newobj);
8192
8193         nft_obj_destroy(&trans->ctx, newobj);
8194 }
8195
8196 static void nft_commit_release(struct nft_trans *trans)
8197 {
8198         switch (trans->msg_type) {
8199         case NFT_MSG_DELTABLE:
8200                 nf_tables_table_destroy(&trans->ctx);
8201                 break;
8202         case NFT_MSG_NEWCHAIN:
8203                 free_percpu(nft_trans_chain_stats(trans));
8204                 kfree(nft_trans_chain_name(trans));
8205                 break;
8206         case NFT_MSG_DELCHAIN:
8207                 nf_tables_chain_destroy(&trans->ctx);
8208                 break;
8209         case NFT_MSG_DELRULE:
8210                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8211                 break;
8212         case NFT_MSG_DELSET:
8213                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8214                 break;
8215         case NFT_MSG_DELSETELEM:
8216                 nf_tables_set_elem_destroy(&trans->ctx,
8217                                            nft_trans_elem_set(trans),
8218                                            nft_trans_elem(trans).priv);
8219                 break;
8220         case NFT_MSG_DELOBJ:
8221                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8222                 break;
8223         case NFT_MSG_DELFLOWTABLE:
8224                 if (nft_trans_flowtable_update(trans))
8225                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8226                 else
8227                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8228                 break;
8229         }
8230
8231         if (trans->put_net)
8232                 put_net(trans->ctx.net);
8233
8234         kfree(trans);
8235 }
8236
8237 static void nf_tables_trans_destroy_work(struct work_struct *w)
8238 {
8239         struct nft_trans *trans, *next;
8240         LIST_HEAD(head);
8241
8242         spin_lock(&nf_tables_destroy_list_lock);
8243         list_splice_init(&nf_tables_destroy_list, &head);
8244         spin_unlock(&nf_tables_destroy_list_lock);
8245
8246         if (list_empty(&head))
8247                 return;
8248
8249         synchronize_rcu();
8250
8251         list_for_each_entry_safe(trans, next, &head, list) {
8252                 list_del(&trans->list);
8253                 nft_commit_release(trans);
8254         }
8255 }
8256
8257 void nf_tables_trans_destroy_flush_work(void)
8258 {
8259         flush_work(&trans_destroy_work);
8260 }
8261 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8262
8263 static bool nft_expr_reduce(struct nft_regs_track *track,
8264                             const struct nft_expr *expr)
8265 {
8266         return false;
8267 }
8268
8269 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8270 {
8271         const struct nft_expr *expr, *last;
8272         struct nft_regs_track track = {};
8273         unsigned int size, data_size;
8274         void *data, *data_boundary;
8275         struct nft_rule_dp *prule;
8276         struct nft_rule *rule;
8277
8278         /* already handled or inactive chain? */
8279         if (chain->blob_next || !nft_is_active_next(net, chain))
8280                 return 0;
8281
8282         rule = list_entry(&chain->rules, struct nft_rule, list);
8283
8284         data_size = 0;
8285         list_for_each_entry_continue(rule, &chain->rules, list) {
8286                 if (nft_is_active_next(net, rule)) {
8287                         data_size += sizeof(*prule) + rule->dlen;
8288                         if (data_size > INT_MAX)
8289                                 return -ENOMEM;
8290                 }
8291         }
8292         data_size += offsetof(struct nft_rule_dp, data);        /* last rule */
8293
8294         chain->blob_next = nf_tables_chain_alloc_rules(data_size);
8295         if (!chain->blob_next)
8296                 return -ENOMEM;
8297
8298         data = (void *)chain->blob_next->data;
8299         data_boundary = data + data_size;
8300         size = 0;
8301
8302         list_for_each_entry_continue(rule, &chain->rules, list) {
8303                 if (!nft_is_active_next(net, rule))
8304                         continue;
8305
8306                 prule = (struct nft_rule_dp *)data;
8307                 data += offsetof(struct nft_rule_dp, data);
8308                 if (WARN_ON_ONCE(data > data_boundary))
8309                         return -ENOMEM;
8310
8311                 size = 0;
8312                 track.last = nft_expr_last(rule);
8313                 nft_rule_for_each_expr(expr, last, rule) {
8314                         track.cur = expr;
8315
8316                         if (nft_expr_reduce(&track, expr)) {
8317                                 expr = track.cur;
8318                                 continue;
8319                         }
8320
8321                         if (WARN_ON_ONCE(data + expr->ops->size > data_boundary))
8322                                 return -ENOMEM;
8323
8324                         memcpy(data + size, expr, expr->ops->size);
8325                         size += expr->ops->size;
8326                 }
8327                 if (WARN_ON_ONCE(size >= 1 << 12))
8328                         return -ENOMEM;
8329
8330                 prule->handle = rule->handle;
8331                 prule->dlen = size;
8332                 prule->is_last = 0;
8333
8334                 data += size;
8335                 size = 0;
8336                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
8337         }
8338
8339         prule = (struct nft_rule_dp *)data;
8340         data += offsetof(struct nft_rule_dp, data);
8341         if (WARN_ON_ONCE(data > data_boundary))
8342                 return -ENOMEM;
8343
8344         nft_last_rule(chain->blob_next, prule);
8345
8346         return 0;
8347 }
8348
8349 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8350 {
8351         struct nftables_pernet *nft_net = nft_pernet(net);
8352         struct nft_trans *trans, *next;
8353
8354         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8355                 struct nft_chain *chain = trans->ctx.chain;
8356
8357                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8358                     trans->msg_type == NFT_MSG_DELRULE) {
8359                         kvfree(chain->blob_next);
8360                         chain->blob_next = NULL;
8361                 }
8362         }
8363 }
8364
8365 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8366 {
8367         struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8368
8369         kvfree(o->blob);
8370 }
8371
8372 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
8373 {
8374         struct nft_rules_old *old;
8375
8376         /* rcu_head is after end marker */
8377         old = (void *)blob + sizeof(*blob) + blob->size;
8378         old->blob = blob;
8379
8380         call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8381 }
8382
8383 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8384 {
8385         struct nft_rule_blob *g0, *g1;
8386         bool next_genbit;
8387
8388         next_genbit = nft_gencursor_next(net);
8389
8390         g0 = rcu_dereference_protected(chain->blob_gen_0,
8391                                        lockdep_commit_lock_is_held(net));
8392         g1 = rcu_dereference_protected(chain->blob_gen_1,
8393                                        lockdep_commit_lock_is_held(net));
8394
8395         /* No changes to this chain? */
8396         if (chain->blob_next == NULL) {
8397                 /* chain had no change in last or next generation */
8398                 if (g0 == g1)
8399                         return;
8400                 /*
8401                  * chain had no change in this generation; make sure next
8402                  * one uses same rules as current generation.
8403                  */
8404                 if (next_genbit) {
8405                         rcu_assign_pointer(chain->blob_gen_1, g0);
8406                         nf_tables_commit_chain_free_rules_old(g1);
8407                 } else {
8408                         rcu_assign_pointer(chain->blob_gen_0, g1);
8409                         nf_tables_commit_chain_free_rules_old(g0);
8410                 }
8411
8412                 return;
8413         }
8414
8415         if (next_genbit)
8416                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
8417         else
8418                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
8419
8420         chain->blob_next = NULL;
8421
8422         if (g0 == g1)
8423                 return;
8424
8425         if (next_genbit)
8426                 nf_tables_commit_chain_free_rules_old(g1);
8427         else
8428                 nf_tables_commit_chain_free_rules_old(g0);
8429 }
8430
8431 static void nft_obj_del(struct nft_object *obj)
8432 {
8433         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8434         list_del_rcu(&obj->list);
8435 }
8436
8437 void nft_chain_del(struct nft_chain *chain)
8438 {
8439         struct nft_table *table = chain->table;
8440
8441         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8442                                      nft_chain_ht_params));
8443         list_del_rcu(&chain->list);
8444 }
8445
8446 static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
8447                                     struct list_head *hook_list)
8448 {
8449         struct nft_hook *hook, *next;
8450
8451         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8452                 if (hook->inactive)
8453                         list_move(&hook->list, hook_list);
8454         }
8455 }
8456
8457 static void nf_tables_module_autoload_cleanup(struct net *net)
8458 {
8459         struct nftables_pernet *nft_net = nft_pernet(net);
8460         struct nft_module_request *req, *next;
8461
8462         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8463         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8464                 WARN_ON_ONCE(!req->done);
8465                 list_del(&req->list);
8466                 kfree(req);
8467         }
8468 }
8469
8470 static void nf_tables_commit_release(struct net *net)
8471 {
8472         struct nftables_pernet *nft_net = nft_pernet(net);
8473         struct nft_trans *trans;
8474
8475         /* all side effects have to be made visible.
8476          * For example, if a chain named 'foo' has been deleted, a
8477          * new transaction must not find it anymore.
8478          *
8479          * Memory reclaim happens asynchronously from work queue
8480          * to prevent expensive synchronize_rcu() in commit phase.
8481          */
8482         if (list_empty(&nft_net->commit_list)) {
8483                 nf_tables_module_autoload_cleanup(net);
8484                 mutex_unlock(&nft_net->commit_mutex);
8485                 return;
8486         }
8487
8488         trans = list_last_entry(&nft_net->commit_list,
8489                                 struct nft_trans, list);
8490         get_net(trans->ctx.net);
8491         WARN_ON_ONCE(trans->put_net);
8492
8493         trans->put_net = true;
8494         spin_lock(&nf_tables_destroy_list_lock);
8495         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
8496         spin_unlock(&nf_tables_destroy_list_lock);
8497
8498         nf_tables_module_autoload_cleanup(net);
8499         schedule_work(&trans_destroy_work);
8500
8501         mutex_unlock(&nft_net->commit_mutex);
8502 }
8503
8504 static void nft_commit_notify(struct net *net, u32 portid)
8505 {
8506         struct nftables_pernet *nft_net = nft_pernet(net);
8507         struct sk_buff *batch_skb = NULL, *nskb, *skb;
8508         unsigned char *data;
8509         int len;
8510
8511         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
8512                 if (!batch_skb) {
8513 new_batch:
8514                         batch_skb = skb;
8515                         len = NLMSG_GOODSIZE - skb->len;
8516                         list_del(&skb->list);
8517                         continue;
8518                 }
8519                 len -= skb->len;
8520                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8521                         data = skb_put(batch_skb, skb->len);
8522                         memcpy(data, skb->data, skb->len);
8523                         list_del(&skb->list);
8524                         kfree_skb(skb);
8525                         continue;
8526                 }
8527                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8528                                NFT_CB(batch_skb).report, GFP_KERNEL);
8529                 goto new_batch;
8530         }
8531
8532         if (batch_skb) {
8533                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8534                                NFT_CB(batch_skb).report, GFP_KERNEL);
8535         }
8536
8537         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
8538 }
8539
8540 static int nf_tables_commit_audit_alloc(struct list_head *adl,
8541                                         struct nft_table *table)
8542 {
8543         struct nft_audit_data *adp;
8544
8545         list_for_each_entry(adp, adl, list) {
8546                 if (adp->table == table)
8547                         return 0;
8548         }
8549         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
8550         if (!adp)
8551                 return -ENOMEM;
8552         adp->table = table;
8553         list_add(&adp->list, adl);
8554         return 0;
8555 }
8556
8557 static void nf_tables_commit_audit_free(struct list_head *adl)
8558 {
8559         struct nft_audit_data *adp, *adn;
8560
8561         list_for_each_entry_safe(adp, adn, adl, list) {
8562                 list_del(&adp->list);
8563                 kfree(adp);
8564         }
8565 }
8566
8567 static void nf_tables_commit_audit_collect(struct list_head *adl,
8568                                            struct nft_table *table, u32 op)
8569 {
8570         struct nft_audit_data *adp;
8571
8572         list_for_each_entry(adp, adl, list) {
8573                 if (adp->table == table)
8574                         goto found;
8575         }
8576         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
8577         return;
8578 found:
8579         adp->entries++;
8580         if (!adp->op || adp->op > op)
8581                 adp->op = op;
8582 }
8583
8584 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
8585
8586 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
8587 {
8588         struct nft_audit_data *adp, *adn;
8589         char aubuf[AUNFTABLENAMELEN];
8590
8591         list_for_each_entry_safe(adp, adn, adl, list) {
8592                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
8593                          generation);
8594                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
8595                                 nft2audit_op[adp->op], GFP_KERNEL);
8596                 list_del(&adp->list);
8597                 kfree(adp);
8598         }
8599 }
8600
8601 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8602 {
8603         struct nftables_pernet *nft_net = nft_pernet(net);
8604         struct nft_trans *trans, *next;
8605         struct nft_trans_elem *te;
8606         struct nft_chain *chain;
8607         struct nft_table *table;
8608         LIST_HEAD(adl);
8609         int err;
8610
8611         if (list_empty(&nft_net->commit_list)) {
8612                 mutex_unlock(&nft_net->commit_mutex);
8613                 return 0;
8614         }
8615
8616         /* 0. Validate ruleset, otherwise roll back for error reporting. */
8617         if (nf_tables_validate(net) < 0)
8618                 return -EAGAIN;
8619
8620         err = nft_flow_rule_offload_commit(net);
8621         if (err < 0)
8622                 return err;
8623
8624         /* 1.  Allocate space for next generation rules_gen_X[] */
8625         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8626                 int ret;
8627
8628                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
8629                 if (ret) {
8630                         nf_tables_commit_chain_prepare_cancel(net);
8631                         nf_tables_commit_audit_free(&adl);
8632                         return ret;
8633                 }
8634                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8635                     trans->msg_type == NFT_MSG_DELRULE) {
8636                         chain = trans->ctx.chain;
8637
8638                         ret = nf_tables_commit_chain_prepare(net, chain);
8639                         if (ret < 0) {
8640                                 nf_tables_commit_chain_prepare_cancel(net);
8641                                 nf_tables_commit_audit_free(&adl);
8642                                 return ret;
8643                         }
8644                 }
8645         }
8646
8647         /* step 2.  Make rules_gen_X visible to packet path */
8648         list_for_each_entry(table, &nft_net->tables, list) {
8649                 list_for_each_entry(chain, &table->chains, list)
8650                         nf_tables_commit_chain(net, chain);
8651         }
8652
8653         /*
8654          * Bump generation counter, invalidate any dump in progress.
8655          * Cannot fail after this point.
8656          */
8657         while (++nft_net->base_seq == 0)
8658                 ;
8659
8660         /* step 3. Start new generation, rules_gen_X now in use. */
8661         net->nft.gencursor = nft_gencursor_next(net);
8662
8663         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8664                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
8665                                                trans->msg_type);
8666                 switch (trans->msg_type) {
8667                 case NFT_MSG_NEWTABLE:
8668                         if (nft_trans_table_update(trans)) {
8669                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8670                                         nft_trans_destroy(trans);
8671                                         break;
8672                                 }
8673                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
8674                                         nf_tables_table_disable(net, trans->ctx.table);
8675
8676                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8677                         } else {
8678                                 nft_clear(net, trans->ctx.table);
8679                         }
8680                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8681                         nft_trans_destroy(trans);
8682                         break;
8683                 case NFT_MSG_DELTABLE:
8684                         list_del_rcu(&trans->ctx.table->list);
8685                         nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8686                         break;
8687                 case NFT_MSG_NEWCHAIN:
8688                         if (nft_trans_chain_update(trans)) {
8689                                 nft_chain_commit_update(trans);
8690                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8691                                 /* trans destroyed after rcu grace period */
8692                         } else {
8693                                 nft_chain_commit_drop_policy(trans);
8694                                 nft_clear(net, trans->ctx.chain);
8695                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8696                                 nft_trans_destroy(trans);
8697                         }
8698                         break;
8699                 case NFT_MSG_DELCHAIN:
8700                         nft_chain_del(trans->ctx.chain);
8701                         nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8702                         nf_tables_unregister_hook(trans->ctx.net,
8703                                                   trans->ctx.table,
8704                                                   trans->ctx.chain);
8705                         break;
8706                 case NFT_MSG_NEWRULE:
8707                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8708                         nf_tables_rule_notify(&trans->ctx,
8709                                               nft_trans_rule(trans),
8710                                               NFT_MSG_NEWRULE);
8711                         nft_trans_destroy(trans);
8712                         break;
8713                 case NFT_MSG_DELRULE:
8714                         list_del_rcu(&nft_trans_rule(trans)->list);
8715                         nf_tables_rule_notify(&trans->ctx,
8716                                               nft_trans_rule(trans),
8717                                               NFT_MSG_DELRULE);
8718                         nft_rule_expr_deactivate(&trans->ctx,
8719                                                  nft_trans_rule(trans),
8720                                                  NFT_TRANS_COMMIT);
8721                         break;
8722                 case NFT_MSG_NEWSET:
8723                         nft_clear(net, nft_trans_set(trans));
8724                         /* This avoids hitting -EBUSY when deleting the table
8725                          * from the transaction.
8726                          */
8727                         if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8728                             !list_empty(&nft_trans_set(trans)->bindings))
8729                                 trans->ctx.table->use--;
8730
8731                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8732                                              NFT_MSG_NEWSET, GFP_KERNEL);
8733                         nft_trans_destroy(trans);
8734                         break;
8735                 case NFT_MSG_DELSET:
8736                         list_del_rcu(&nft_trans_set(trans)->list);
8737                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8738                                              NFT_MSG_DELSET, GFP_KERNEL);
8739                         break;
8740                 case NFT_MSG_NEWSETELEM:
8741                         te = (struct nft_trans_elem *)trans->data;
8742
8743                         nft_setelem_activate(net, te->set, &te->elem);
8744                         nf_tables_setelem_notify(&trans->ctx, te->set,
8745                                                  &te->elem,
8746                                                  NFT_MSG_NEWSETELEM);
8747                         nft_trans_destroy(trans);
8748                         break;
8749                 case NFT_MSG_DELSETELEM:
8750                         te = (struct nft_trans_elem *)trans->data;
8751
8752                         nf_tables_setelem_notify(&trans->ctx, te->set,
8753                                                  &te->elem,
8754                                                  NFT_MSG_DELSETELEM);
8755                         nft_setelem_remove(net, te->set, &te->elem);
8756                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
8757                                 atomic_dec(&te->set->nelems);
8758                                 te->set->ndeact--;
8759                         }
8760                         break;
8761                 case NFT_MSG_NEWOBJ:
8762                         if (nft_trans_obj_update(trans)) {
8763                                 nft_obj_commit_update(trans);
8764                                 nf_tables_obj_notify(&trans->ctx,
8765                                                      nft_trans_obj(trans),
8766                                                      NFT_MSG_NEWOBJ);
8767                         } else {
8768                                 nft_clear(net, nft_trans_obj(trans));
8769                                 nf_tables_obj_notify(&trans->ctx,
8770                                                      nft_trans_obj(trans),
8771                                                      NFT_MSG_NEWOBJ);
8772                                 nft_trans_destroy(trans);
8773                         }
8774                         break;
8775                 case NFT_MSG_DELOBJ:
8776                         nft_obj_del(nft_trans_obj(trans));
8777                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8778                                              NFT_MSG_DELOBJ);
8779                         break;
8780                 case NFT_MSG_NEWFLOWTABLE:
8781                         if (nft_trans_flowtable_update(trans)) {
8782                                 nft_trans_flowtable(trans)->data.flags =
8783                                         nft_trans_flowtable_flags(trans);
8784                                 nf_tables_flowtable_notify(&trans->ctx,
8785                                                            nft_trans_flowtable(trans),
8786                                                            &nft_trans_flowtable_hooks(trans),
8787                                                            NFT_MSG_NEWFLOWTABLE);
8788                                 list_splice(&nft_trans_flowtable_hooks(trans),
8789                                             &nft_trans_flowtable(trans)->hook_list);
8790                         } else {
8791                                 nft_clear(net, nft_trans_flowtable(trans));
8792                                 nf_tables_flowtable_notify(&trans->ctx,
8793                                                            nft_trans_flowtable(trans),
8794                                                            &nft_trans_flowtable(trans)->hook_list,
8795                                                            NFT_MSG_NEWFLOWTABLE);
8796                         }
8797                         nft_trans_destroy(trans);
8798                         break;
8799                 case NFT_MSG_DELFLOWTABLE:
8800                         if (nft_trans_flowtable_update(trans)) {
8801                                 nft_flowtable_hooks_del(nft_trans_flowtable(trans),
8802                                                         &nft_trans_flowtable_hooks(trans));
8803                                 nf_tables_flowtable_notify(&trans->ctx,
8804                                                            nft_trans_flowtable(trans),
8805                                                            &nft_trans_flowtable_hooks(trans),
8806                                                            NFT_MSG_DELFLOWTABLE);
8807                                 nft_unregister_flowtable_net_hooks(net,
8808                                                                    &nft_trans_flowtable_hooks(trans));
8809                         } else {
8810                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8811                                 nf_tables_flowtable_notify(&trans->ctx,
8812                                                            nft_trans_flowtable(trans),
8813                                                            &nft_trans_flowtable(trans)->hook_list,
8814                                                            NFT_MSG_DELFLOWTABLE);
8815                                 nft_unregister_flowtable_net_hooks(net,
8816                                                 &nft_trans_flowtable(trans)->hook_list);
8817                         }
8818                         break;
8819                 }
8820         }
8821
8822         nft_commit_notify(net, NETLINK_CB(skb).portid);
8823         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8824         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
8825         nf_tables_commit_release(net);
8826
8827         return 0;
8828 }
8829
8830 static void nf_tables_module_autoload(struct net *net)
8831 {
8832         struct nftables_pernet *nft_net = nft_pernet(net);
8833         struct nft_module_request *req, *next;
8834         LIST_HEAD(module_list);
8835
8836         list_splice_init(&nft_net->module_list, &module_list);
8837         mutex_unlock(&nft_net->commit_mutex);
8838         list_for_each_entry_safe(req, next, &module_list, list) {
8839                 request_module("%s", req->module);
8840                 req->done = true;
8841         }
8842         mutex_lock(&nft_net->commit_mutex);
8843         list_splice(&module_list, &nft_net->module_list);
8844 }
8845
8846 static void nf_tables_abort_release(struct nft_trans *trans)
8847 {
8848         switch (trans->msg_type) {
8849         case NFT_MSG_NEWTABLE:
8850                 nf_tables_table_destroy(&trans->ctx);
8851                 break;
8852         case NFT_MSG_NEWCHAIN:
8853                 nf_tables_chain_destroy(&trans->ctx);
8854                 break;
8855         case NFT_MSG_NEWRULE:
8856                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8857                 break;
8858         case NFT_MSG_NEWSET:
8859                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8860                 break;
8861         case NFT_MSG_NEWSETELEM:
8862                 nft_set_elem_destroy(nft_trans_elem_set(trans),
8863                                      nft_trans_elem(trans).priv, true);
8864                 break;
8865         case NFT_MSG_NEWOBJ:
8866                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8867                 break;
8868         case NFT_MSG_NEWFLOWTABLE:
8869                 if (nft_trans_flowtable_update(trans))
8870                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8871                 else
8872                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8873                 break;
8874         }
8875         kfree(trans);
8876 }
8877
8878 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
8879 {
8880         struct nftables_pernet *nft_net = nft_pernet(net);
8881         struct nft_trans *trans, *next;
8882         struct nft_trans_elem *te;
8883         struct nft_hook *hook;
8884
8885         if (action == NFNL_ABORT_VALIDATE &&
8886             nf_tables_validate(net) < 0)
8887                 return -EAGAIN;
8888
8889         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
8890                                          list) {
8891                 switch (trans->msg_type) {
8892                 case NFT_MSG_NEWTABLE:
8893                         if (nft_trans_table_update(trans)) {
8894                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8895                                         nft_trans_destroy(trans);
8896                                         break;
8897                                 }
8898                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
8899                                         nf_tables_table_disable(net, trans->ctx.table);
8900                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8901                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
8902                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
8903                                 }
8904                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8905                                 nft_trans_destroy(trans);
8906                         } else {
8907                                 list_del_rcu(&trans->ctx.table->list);
8908                         }
8909                         break;
8910                 case NFT_MSG_DELTABLE:
8911                         nft_clear(trans->ctx.net, trans->ctx.table);
8912                         nft_trans_destroy(trans);
8913                         break;
8914                 case NFT_MSG_NEWCHAIN:
8915                         if (nft_trans_chain_update(trans)) {
8916                                 free_percpu(nft_trans_chain_stats(trans));
8917                                 kfree(nft_trans_chain_name(trans));
8918                                 nft_trans_destroy(trans);
8919                         } else {
8920                                 if (nft_chain_is_bound(trans->ctx.chain)) {
8921                                         nft_trans_destroy(trans);
8922                                         break;
8923                                 }
8924                                 trans->ctx.table->use--;
8925                                 nft_chain_del(trans->ctx.chain);
8926                                 nf_tables_unregister_hook(trans->ctx.net,
8927                                                           trans->ctx.table,
8928                                                           trans->ctx.chain);
8929                         }
8930                         break;
8931                 case NFT_MSG_DELCHAIN:
8932                         trans->ctx.table->use++;
8933                         nft_clear(trans->ctx.net, trans->ctx.chain);
8934                         nft_trans_destroy(trans);
8935                         break;
8936                 case NFT_MSG_NEWRULE:
8937                         trans->ctx.chain->use--;
8938                         list_del_rcu(&nft_trans_rule(trans)->list);
8939                         nft_rule_expr_deactivate(&trans->ctx,
8940                                                  nft_trans_rule(trans),
8941                                                  NFT_TRANS_ABORT);
8942                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8943                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8944                         break;
8945                 case NFT_MSG_DELRULE:
8946                         trans->ctx.chain->use++;
8947                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8948                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
8949                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8950                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8951
8952                         nft_trans_destroy(trans);
8953                         break;
8954                 case NFT_MSG_NEWSET:
8955                         trans->ctx.table->use--;
8956                         if (nft_trans_set_bound(trans)) {
8957                                 nft_trans_destroy(trans);
8958                                 break;
8959                         }
8960                         list_del_rcu(&nft_trans_set(trans)->list);
8961                         break;
8962                 case NFT_MSG_DELSET:
8963                         trans->ctx.table->use++;
8964                         nft_clear(trans->ctx.net, nft_trans_set(trans));
8965                         nft_trans_destroy(trans);
8966                         break;
8967                 case NFT_MSG_NEWSETELEM:
8968                         if (nft_trans_elem_set_bound(trans)) {
8969                                 nft_trans_destroy(trans);
8970                                 break;
8971                         }
8972                         te = (struct nft_trans_elem *)trans->data;
8973                         nft_setelem_remove(net, te->set, &te->elem);
8974                         if (!nft_setelem_is_catchall(te->set, &te->elem))
8975                                 atomic_dec(&te->set->nelems);
8976                         break;
8977                 case NFT_MSG_DELSETELEM:
8978                         te = (struct nft_trans_elem *)trans->data;
8979
8980                         nft_setelem_data_activate(net, te->set, &te->elem);
8981                         nft_setelem_activate(net, te->set, &te->elem);
8982                         if (!nft_setelem_is_catchall(te->set, &te->elem))
8983                                 te->set->ndeact--;
8984
8985                         nft_trans_destroy(trans);
8986                         break;
8987                 case NFT_MSG_NEWOBJ:
8988                         if (nft_trans_obj_update(trans)) {
8989                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
8990                                 nft_trans_destroy(trans);
8991                         } else {
8992                                 trans->ctx.table->use--;
8993                                 nft_obj_del(nft_trans_obj(trans));
8994                         }
8995                         break;
8996                 case NFT_MSG_DELOBJ:
8997                         trans->ctx.table->use++;
8998                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
8999                         nft_trans_destroy(trans);
9000                         break;
9001                 case NFT_MSG_NEWFLOWTABLE:
9002                         if (nft_trans_flowtable_update(trans)) {
9003                                 nft_unregister_flowtable_net_hooks(net,
9004                                                 &nft_trans_flowtable_hooks(trans));
9005                         } else {
9006                                 trans->ctx.table->use--;
9007                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9008                                 nft_unregister_flowtable_net_hooks(net,
9009                                                 &nft_trans_flowtable(trans)->hook_list);
9010                         }
9011                         break;
9012                 case NFT_MSG_DELFLOWTABLE:
9013                         if (nft_trans_flowtable_update(trans)) {
9014                                 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
9015                                         hook->inactive = false;
9016                         } else {
9017                                 trans->ctx.table->use++;
9018                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9019                         }
9020                         nft_trans_destroy(trans);
9021                         break;
9022                 }
9023         }
9024
9025         synchronize_rcu();
9026
9027         list_for_each_entry_safe_reverse(trans, next,
9028                                          &nft_net->commit_list, list) {
9029                 list_del(&trans->list);
9030                 nf_tables_abort_release(trans);
9031         }
9032
9033         if (action == NFNL_ABORT_AUTOLOAD)
9034                 nf_tables_module_autoload(net);
9035         else
9036                 nf_tables_module_autoload_cleanup(net);
9037
9038         return 0;
9039 }
9040
9041 static void nf_tables_cleanup(struct net *net)
9042 {
9043         nft_validate_state_update(net, NFT_VALIDATE_SKIP);
9044 }
9045
9046 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9047                            enum nfnl_abort_action action)
9048 {
9049         struct nftables_pernet *nft_net = nft_pernet(net);
9050         int ret = __nf_tables_abort(net, action);
9051
9052         mutex_unlock(&nft_net->commit_mutex);
9053
9054         return ret;
9055 }
9056
9057 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9058 {
9059         struct nftables_pernet *nft_net = nft_pernet(net);
9060         bool genid_ok;
9061
9062         mutex_lock(&nft_net->commit_mutex);
9063
9064         genid_ok = genid == 0 || nft_net->base_seq == genid;
9065         if (!genid_ok)
9066                 mutex_unlock(&nft_net->commit_mutex);
9067
9068         /* else, commit mutex has to be released by commit or abort function */
9069         return genid_ok;
9070 }
9071
9072 static const struct nfnetlink_subsystem nf_tables_subsys = {
9073         .name           = "nf_tables",
9074         .subsys_id      = NFNL_SUBSYS_NFTABLES,
9075         .cb_count       = NFT_MSG_MAX,
9076         .cb             = nf_tables_cb,
9077         .commit         = nf_tables_commit,
9078         .abort          = nf_tables_abort,
9079         .cleanup        = nf_tables_cleanup,
9080         .valid_genid    = nf_tables_valid_genid,
9081         .owner          = THIS_MODULE,
9082 };
9083
9084 int nft_chain_validate_dependency(const struct nft_chain *chain,
9085                                   enum nft_chain_types type)
9086 {
9087         const struct nft_base_chain *basechain;
9088
9089         if (nft_is_base_chain(chain)) {
9090                 basechain = nft_base_chain(chain);
9091                 if (basechain->type->type != type)
9092                         return -EOPNOTSUPP;
9093         }
9094         return 0;
9095 }
9096 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9097
9098 int nft_chain_validate_hooks(const struct nft_chain *chain,
9099                              unsigned int hook_flags)
9100 {
9101         struct nft_base_chain *basechain;
9102
9103         if (nft_is_base_chain(chain)) {
9104                 basechain = nft_base_chain(chain);
9105
9106                 if ((1 << basechain->ops.hooknum) & hook_flags)
9107                         return 0;
9108
9109                 return -EOPNOTSUPP;
9110         }
9111
9112         return 0;
9113 }
9114 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9115
9116 /*
9117  * Loop detection - walk through the ruleset beginning at the destination chain
9118  * of a new jump until either the source chain is reached (loop) or all
9119  * reachable chains have been traversed.
9120  *
9121  * The loop check is performed whenever a new jump verdict is added to an
9122  * expression or verdict map or a verdict map is bound to a new chain.
9123  */
9124
9125 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9126                                  const struct nft_chain *chain);
9127
9128 static int nft_check_loops(const struct nft_ctx *ctx,
9129                            const struct nft_set_ext *ext)
9130 {
9131         const struct nft_data *data;
9132         int ret;
9133
9134         data = nft_set_ext_data(ext);
9135         switch (data->verdict.code) {
9136         case NFT_JUMP:
9137         case NFT_GOTO:
9138                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9139                 break;
9140         default:
9141                 ret = 0;
9142                 break;
9143         }
9144
9145         return ret;
9146 }
9147
9148 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9149                                         struct nft_set *set,
9150                                         const struct nft_set_iter *iter,
9151                                         struct nft_set_elem *elem)
9152 {
9153         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9154
9155         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9156             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9157                 return 0;
9158
9159         return nft_check_loops(ctx, ext);
9160 }
9161
9162 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9163                                   struct nft_set *set)
9164 {
9165         u8 genmask = nft_genmask_next(ctx->net);
9166         struct nft_set_elem_catchall *catchall;
9167         struct nft_set_ext *ext;
9168         int ret = 0;
9169
9170         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9171                 ext = nft_set_elem_ext(set, catchall->elem);
9172                 if (!nft_set_elem_active(ext, genmask))
9173                         continue;
9174
9175                 ret = nft_check_loops(ctx, ext);
9176                 if (ret < 0)
9177                         return ret;
9178         }
9179
9180         return ret;
9181 }
9182
9183 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9184                                  const struct nft_chain *chain)
9185 {
9186         const struct nft_rule *rule;
9187         const struct nft_expr *expr, *last;
9188         struct nft_set *set;
9189         struct nft_set_binding *binding;
9190         struct nft_set_iter iter;
9191
9192         if (ctx->chain == chain)
9193                 return -ELOOP;
9194
9195         list_for_each_entry(rule, &chain->rules, list) {
9196                 nft_rule_for_each_expr(expr, last, rule) {
9197                         struct nft_immediate_expr *priv;
9198                         const struct nft_data *data;
9199                         int err;
9200
9201                         if (strcmp(expr->ops->type->name, "immediate"))
9202                                 continue;
9203
9204                         priv = nft_expr_priv(expr);
9205                         if (priv->dreg != NFT_REG_VERDICT)
9206                                 continue;
9207
9208                         data = &priv->data;
9209                         switch (data->verdict.code) {
9210                         case NFT_JUMP:
9211                         case NFT_GOTO:
9212                                 err = nf_tables_check_loops(ctx,
9213                                                         data->verdict.chain);
9214                                 if (err < 0)
9215                                         return err;
9216                                 break;
9217                         default:
9218                                 break;
9219                         }
9220                 }
9221         }
9222
9223         list_for_each_entry(set, &ctx->table->sets, list) {
9224                 if (!nft_is_active_next(ctx->net, set))
9225                         continue;
9226                 if (!(set->flags & NFT_SET_MAP) ||
9227                     set->dtype != NFT_DATA_VERDICT)
9228                         continue;
9229
9230                 list_for_each_entry(binding, &set->bindings, list) {
9231                         if (!(binding->flags & NFT_SET_MAP) ||
9232                             binding->chain != chain)
9233                                 continue;
9234
9235                         iter.genmask    = nft_genmask_next(ctx->net);
9236                         iter.skip       = 0;
9237                         iter.count      = 0;
9238                         iter.err        = 0;
9239                         iter.fn         = nf_tables_loop_check_setelem;
9240
9241                         set->ops->walk(ctx, set, &iter);
9242                         if (!iter.err)
9243                                 iter.err = nft_set_catchall_loops(ctx, set);
9244
9245                         if (iter.err < 0)
9246                                 return iter.err;
9247                 }
9248         }
9249
9250         return 0;
9251 }
9252
9253 /**
9254  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
9255  *
9256  *      @attr: netlink attribute to fetch value from
9257  *      @max: maximum value to be stored in dest
9258  *      @dest: pointer to the variable
9259  *
9260  *      Parse, check and store a given u32 netlink attribute into variable.
9261  *      This function returns -ERANGE if the value goes over maximum value.
9262  *      Otherwise a 0 is returned and the attribute value is stored in the
9263  *      destination variable.
9264  */
9265 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9266 {
9267         u32 val;
9268
9269         val = ntohl(nla_get_be32(attr));
9270         if (val > max)
9271                 return -ERANGE;
9272
9273         *dest = val;
9274         return 0;
9275 }
9276 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9277
9278 static unsigned int nft_parse_register(const struct nlattr *attr)
9279 {
9280         unsigned int reg;
9281
9282         reg = ntohl(nla_get_be32(attr));
9283         switch (reg) {
9284         case NFT_REG_VERDICT...NFT_REG_4:
9285                 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9286         default:
9287                 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9288         }
9289 }
9290
9291 /**
9292  *      nft_dump_register - dump a register value to a netlink attribute
9293  *
9294  *      @skb: socket buffer
9295  *      @attr: attribute number
9296  *      @reg: register number
9297  *
9298  *      Construct a netlink attribute containing the register number. For
9299  *      compatibility reasons, register numbers being a multiple of 4 are
9300  *      translated to the corresponding 128 bit register numbers.
9301  */
9302 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9303 {
9304         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9305                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9306         else
9307                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9308
9309         return nla_put_be32(skb, attr, htonl(reg));
9310 }
9311 EXPORT_SYMBOL_GPL(nft_dump_register);
9312
9313 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9314 {
9315         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9316                 return -EINVAL;
9317         if (len == 0)
9318                 return -EINVAL;
9319         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9320                 return -ERANGE;
9321
9322         return 0;
9323 }
9324
9325 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9326 {
9327         u32 reg;
9328         int err;
9329
9330         reg = nft_parse_register(attr);
9331         err = nft_validate_register_load(reg, len);
9332         if (err < 0)
9333                 return err;
9334
9335         *sreg = reg;
9336         return 0;
9337 }
9338 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9339
9340 static int nft_validate_register_store(const struct nft_ctx *ctx,
9341                                        enum nft_registers reg,
9342                                        const struct nft_data *data,
9343                                        enum nft_data_types type,
9344                                        unsigned int len)
9345 {
9346         int err;
9347
9348         switch (reg) {
9349         case NFT_REG_VERDICT:
9350                 if (type != NFT_DATA_VERDICT)
9351                         return -EINVAL;
9352
9353                 if (data != NULL &&
9354                     (data->verdict.code == NFT_GOTO ||
9355                      data->verdict.code == NFT_JUMP)) {
9356                         err = nf_tables_check_loops(ctx, data->verdict.chain);
9357                         if (err < 0)
9358                                 return err;
9359                 }
9360
9361                 return 0;
9362         default:
9363                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9364                         return -EINVAL;
9365                 if (len == 0)
9366                         return -EINVAL;
9367                 if (reg * NFT_REG32_SIZE + len >
9368                     sizeof_field(struct nft_regs, data))
9369                         return -ERANGE;
9370
9371                 if (data != NULL && type != NFT_DATA_VALUE)
9372                         return -EINVAL;
9373                 return 0;
9374         }
9375 }
9376
9377 int nft_parse_register_store(const struct nft_ctx *ctx,
9378                              const struct nlattr *attr, u8 *dreg,
9379                              const struct nft_data *data,
9380                              enum nft_data_types type, unsigned int len)
9381 {
9382         int err;
9383         u32 reg;
9384
9385         reg = nft_parse_register(attr);
9386         err = nft_validate_register_store(ctx, reg, data, type, len);
9387         if (err < 0)
9388                 return err;
9389
9390         *dreg = reg;
9391         return 0;
9392 }
9393 EXPORT_SYMBOL_GPL(nft_parse_register_store);
9394
9395 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9396         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
9397         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
9398                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
9399         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9400 };
9401
9402 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9403                             struct nft_data_desc *desc, const struct nlattr *nla)
9404 {
9405         u8 genmask = nft_genmask_next(ctx->net);
9406         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9407         struct nft_chain *chain;
9408         int err;
9409
9410         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9411                                           nft_verdict_policy, NULL);
9412         if (err < 0)
9413                 return err;
9414
9415         if (!tb[NFTA_VERDICT_CODE])
9416                 return -EINVAL;
9417         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9418
9419         switch (data->verdict.code) {
9420         default:
9421                 switch (data->verdict.code & NF_VERDICT_MASK) {
9422                 case NF_ACCEPT:
9423                 case NF_DROP:
9424                 case NF_QUEUE:
9425                         break;
9426                 default:
9427                         return -EINVAL;
9428                 }
9429                 fallthrough;
9430         case NFT_CONTINUE:
9431         case NFT_BREAK:
9432         case NFT_RETURN:
9433                 break;
9434         case NFT_JUMP:
9435         case NFT_GOTO:
9436                 if (tb[NFTA_VERDICT_CHAIN]) {
9437                         chain = nft_chain_lookup(ctx->net, ctx->table,
9438                                                  tb[NFTA_VERDICT_CHAIN],
9439                                                  genmask);
9440                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9441                         chain = nft_chain_lookup_byid(ctx->net,
9442                                                       tb[NFTA_VERDICT_CHAIN_ID]);
9443                         if (IS_ERR(chain))
9444                                 return PTR_ERR(chain);
9445                 } else {
9446                         return -EINVAL;
9447                 }
9448
9449                 if (IS_ERR(chain))
9450                         return PTR_ERR(chain);
9451                 if (nft_is_base_chain(chain))
9452                         return -EOPNOTSUPP;
9453
9454                 chain->use++;
9455                 data->verdict.chain = chain;
9456                 break;
9457         }
9458
9459         desc->len = sizeof(data->verdict);
9460         desc->type = NFT_DATA_VERDICT;
9461         return 0;
9462 }
9463
9464 static void nft_verdict_uninit(const struct nft_data *data)
9465 {
9466         struct nft_chain *chain;
9467         struct nft_rule *rule;
9468
9469         switch (data->verdict.code) {
9470         case NFT_JUMP:
9471         case NFT_GOTO:
9472                 chain = data->verdict.chain;
9473                 chain->use--;
9474
9475                 if (!nft_chain_is_bound(chain))
9476                         break;
9477
9478                 chain->table->use--;
9479                 list_for_each_entry(rule, &chain->rules, list)
9480                         chain->use--;
9481
9482                 nft_chain_del(chain);
9483                 break;
9484         }
9485 }
9486
9487 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
9488 {
9489         struct nlattr *nest;
9490
9491         nest = nla_nest_start_noflag(skb, type);
9492         if (!nest)
9493                 goto nla_put_failure;
9494
9495         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
9496                 goto nla_put_failure;
9497
9498         switch (v->code) {
9499         case NFT_JUMP:
9500         case NFT_GOTO:
9501                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
9502                                    v->chain->name))
9503                         goto nla_put_failure;
9504         }
9505         nla_nest_end(skb, nest);
9506         return 0;
9507
9508 nla_put_failure:
9509         return -1;
9510 }
9511
9512 static int nft_value_init(const struct nft_ctx *ctx,
9513                           struct nft_data *data, unsigned int size,
9514                           struct nft_data_desc *desc, const struct nlattr *nla)
9515 {
9516         unsigned int len;
9517
9518         len = nla_len(nla);
9519         if (len == 0)
9520                 return -EINVAL;
9521         if (len > size)
9522                 return -EOVERFLOW;
9523
9524         nla_memcpy(data->data, nla, len);
9525         desc->type = NFT_DATA_VALUE;
9526         desc->len  = len;
9527         return 0;
9528 }
9529
9530 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
9531                           unsigned int len)
9532 {
9533         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
9534 }
9535
9536 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
9537         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
9538         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
9539 };
9540
9541 /**
9542  *      nft_data_init - parse nf_tables data netlink attributes
9543  *
9544  *      @ctx: context of the expression using the data
9545  *      @data: destination struct nft_data
9546  *      @size: maximum data length
9547  *      @desc: data description
9548  *      @nla: netlink attribute containing data
9549  *
9550  *      Parse the netlink data attributes and initialize a struct nft_data.
9551  *      The type and length of data are returned in the data description.
9552  *
9553  *      The caller can indicate that it only wants to accept data of type
9554  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
9555  */
9556 int nft_data_init(const struct nft_ctx *ctx,
9557                   struct nft_data *data, unsigned int size,
9558                   struct nft_data_desc *desc, const struct nlattr *nla)
9559 {
9560         struct nlattr *tb[NFTA_DATA_MAX + 1];
9561         int err;
9562
9563         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
9564                                           nft_data_policy, NULL);
9565         if (err < 0)
9566                 return err;
9567
9568         if (tb[NFTA_DATA_VALUE])
9569                 return nft_value_init(ctx, data, size, desc,
9570                                       tb[NFTA_DATA_VALUE]);
9571         if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
9572                 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
9573         return -EINVAL;
9574 }
9575 EXPORT_SYMBOL_GPL(nft_data_init);
9576
9577 /**
9578  *      nft_data_release - release a nft_data item
9579  *
9580  *      @data: struct nft_data to release
9581  *      @type: type of data
9582  *
9583  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
9584  *      all others need to be released by calling this function.
9585  */
9586 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
9587 {
9588         if (type < NFT_DATA_VERDICT)
9589                 return;
9590         switch (type) {
9591         case NFT_DATA_VERDICT:
9592                 return nft_verdict_uninit(data);
9593         default:
9594                 WARN_ON(1);
9595         }
9596 }
9597 EXPORT_SYMBOL_GPL(nft_data_release);
9598
9599 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9600                   enum nft_data_types type, unsigned int len)
9601 {
9602         struct nlattr *nest;
9603         int err;
9604
9605         nest = nla_nest_start_noflag(skb, attr);
9606         if (nest == NULL)
9607                 return -1;
9608
9609         switch (type) {
9610         case NFT_DATA_VALUE:
9611                 err = nft_value_dump(skb, data, len);
9612                 break;
9613         case NFT_DATA_VERDICT:
9614                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
9615                 break;
9616         default:
9617                 err = -EINVAL;
9618                 WARN_ON(1);
9619         }
9620
9621         nla_nest_end(skb, nest);
9622         return err;
9623 }
9624 EXPORT_SYMBOL_GPL(nft_data_dump);
9625
9626 int __nft_release_basechain(struct nft_ctx *ctx)
9627 {
9628         struct nft_rule *rule, *nr;
9629
9630         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9631                 return 0;
9632
9633         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
9634         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9635                 list_del(&rule->list);
9636                 ctx->chain->use--;
9637                 nf_tables_rule_release(ctx, rule);
9638         }
9639         nft_chain_del(ctx->chain);
9640         ctx->table->use--;
9641         nf_tables_chain_destroy(ctx);
9642
9643         return 0;
9644 }
9645 EXPORT_SYMBOL_GPL(__nft_release_basechain);
9646
9647 static void __nft_release_hook(struct net *net, struct nft_table *table)
9648 {
9649         struct nft_flowtable *flowtable;
9650         struct nft_chain *chain;
9651
9652         list_for_each_entry(chain, &table->chains, list)
9653                 nf_tables_unregister_hook(net, table, chain);
9654         list_for_each_entry(flowtable, &table->flowtables, list)
9655                 nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list);
9656 }
9657
9658 static void __nft_release_hooks(struct net *net)
9659 {
9660         struct nftables_pernet *nft_net = nft_pernet(net);
9661         struct nft_table *table;
9662
9663         list_for_each_entry(table, &nft_net->tables, list) {
9664                 if (nft_table_has_owner(table))
9665                         continue;
9666
9667                 __nft_release_hook(net, table);
9668         }
9669 }
9670
9671 static void __nft_release_table(struct net *net, struct nft_table *table)
9672 {
9673         struct nft_flowtable *flowtable, *nf;
9674         struct nft_chain *chain, *nc;
9675         struct nft_object *obj, *ne;
9676         struct nft_rule *rule, *nr;
9677         struct nft_set *set, *ns;
9678         struct nft_ctx ctx = {
9679                 .net    = net,
9680                 .family = NFPROTO_NETDEV,
9681         };
9682
9683         ctx.family = table->family;
9684         ctx.table = table;
9685         list_for_each_entry(chain, &table->chains, list) {
9686                 ctx.chain = chain;
9687                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
9688                         list_del(&rule->list);
9689                         chain->use--;
9690                         nf_tables_rule_release(&ctx, rule);
9691                 }
9692         }
9693         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
9694                 list_del(&flowtable->list);
9695                 table->use--;
9696                 nf_tables_flowtable_destroy(flowtable);
9697         }
9698         list_for_each_entry_safe(set, ns, &table->sets, list) {
9699                 list_del(&set->list);
9700                 table->use--;
9701                 nft_set_destroy(&ctx, set);
9702         }
9703         list_for_each_entry_safe(obj, ne, &table->objects, list) {
9704                 nft_obj_del(obj);
9705                 table->use--;
9706                 nft_obj_destroy(&ctx, obj);
9707         }
9708         list_for_each_entry_safe(chain, nc, &table->chains, list) {
9709                 ctx.chain = chain;
9710                 nft_chain_del(chain);
9711                 table->use--;
9712                 nf_tables_chain_destroy(&ctx);
9713         }
9714         nf_tables_table_destroy(&ctx);
9715 }
9716
9717 static void __nft_release_tables(struct net *net)
9718 {
9719         struct nftables_pernet *nft_net = nft_pernet(net);
9720         struct nft_table *table, *nt;
9721
9722         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
9723                 if (nft_table_has_owner(table))
9724                         continue;
9725
9726                 list_del(&table->list);
9727
9728                 __nft_release_table(net, table);
9729         }
9730 }
9731
9732 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
9733                             void *ptr)
9734 {
9735         struct nft_table *table, *to_delete[8];
9736         struct nftables_pernet *nft_net;
9737         struct netlink_notify *n = ptr;
9738         struct net *net = n->net;
9739         unsigned int deleted;
9740         bool restart = false;
9741
9742         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
9743                 return NOTIFY_DONE;
9744
9745         nft_net = nft_pernet(net);
9746         deleted = 0;
9747         mutex_lock(&nft_net->commit_mutex);
9748 again:
9749         list_for_each_entry(table, &nft_net->tables, list) {
9750                 if (nft_table_has_owner(table) &&
9751                     n->portid == table->nlpid) {
9752                         __nft_release_hook(net, table);
9753                         list_del_rcu(&table->list);
9754                         to_delete[deleted++] = table;
9755                         if (deleted >= ARRAY_SIZE(to_delete))
9756                                 break;
9757                 }
9758         }
9759         if (deleted) {
9760                 restart = deleted >= ARRAY_SIZE(to_delete);
9761                 synchronize_rcu();
9762                 while (deleted)
9763                         __nft_release_table(net, to_delete[--deleted]);
9764
9765                 if (restart)
9766                         goto again;
9767         }
9768         mutex_unlock(&nft_net->commit_mutex);
9769
9770         return NOTIFY_DONE;
9771 }
9772
9773 static struct notifier_block nft_nl_notifier = {
9774         .notifier_call  = nft_rcv_nl_event,
9775 };
9776
9777 static int __net_init nf_tables_init_net(struct net *net)
9778 {
9779         struct nftables_pernet *nft_net = nft_pernet(net);
9780
9781         INIT_LIST_HEAD(&nft_net->tables);
9782         INIT_LIST_HEAD(&nft_net->commit_list);
9783         INIT_LIST_HEAD(&nft_net->module_list);
9784         INIT_LIST_HEAD(&nft_net->notify_list);
9785         mutex_init(&nft_net->commit_mutex);
9786         nft_net->base_seq = 1;
9787         nft_net->validate_state = NFT_VALIDATE_SKIP;
9788
9789         return 0;
9790 }
9791
9792 static void __net_exit nf_tables_pre_exit_net(struct net *net)
9793 {
9794         __nft_release_hooks(net);
9795 }
9796
9797 static void __net_exit nf_tables_exit_net(struct net *net)
9798 {
9799         struct nftables_pernet *nft_net = nft_pernet(net);
9800
9801         mutex_lock(&nft_net->commit_mutex);
9802         if (!list_empty(&nft_net->commit_list))
9803                 __nf_tables_abort(net, NFNL_ABORT_NONE);
9804         __nft_release_tables(net);
9805         mutex_unlock(&nft_net->commit_mutex);
9806         WARN_ON_ONCE(!list_empty(&nft_net->tables));
9807         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
9808         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9809 }
9810
9811 static struct pernet_operations nf_tables_net_ops = {
9812         .init           = nf_tables_init_net,
9813         .pre_exit       = nf_tables_pre_exit_net,
9814         .exit           = nf_tables_exit_net,
9815         .id             = &nf_tables_net_id,
9816         .size           = sizeof(struct nftables_pernet),
9817 };
9818
9819 static int __init nf_tables_module_init(void)
9820 {
9821         int err;
9822
9823         err = register_pernet_subsys(&nf_tables_net_ops);
9824         if (err < 0)
9825                 return err;
9826
9827         err = nft_chain_filter_init();
9828         if (err < 0)
9829                 goto err_chain_filter;
9830
9831         err = nf_tables_core_module_init();
9832         if (err < 0)
9833                 goto err_core_module;
9834
9835         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
9836         if (err < 0)
9837                 goto err_netdev_notifier;
9838
9839         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
9840         if (err < 0)
9841                 goto err_rht_objname;
9842
9843         err = nft_offload_init();
9844         if (err < 0)
9845                 goto err_offload;
9846
9847         err = netlink_register_notifier(&nft_nl_notifier);
9848         if (err < 0)
9849                 goto err_netlink_notifier;
9850
9851         /* must be last */
9852         err = nfnetlink_subsys_register(&nf_tables_subsys);
9853         if (err < 0)
9854                 goto err_nfnl_subsys;
9855
9856         nft_chain_route_init();
9857
9858         return err;
9859
9860 err_nfnl_subsys:
9861         netlink_unregister_notifier(&nft_nl_notifier);
9862 err_netlink_notifier:
9863         nft_offload_exit();
9864 err_offload:
9865         rhltable_destroy(&nft_objname_ht);
9866 err_rht_objname:
9867         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9868 err_netdev_notifier:
9869         nf_tables_core_module_exit();
9870 err_core_module:
9871         nft_chain_filter_fini();
9872 err_chain_filter:
9873         unregister_pernet_subsys(&nf_tables_net_ops);
9874         return err;
9875 }
9876
9877 static void __exit nf_tables_module_exit(void)
9878 {
9879         nfnetlink_subsys_unregister(&nf_tables_subsys);
9880         netlink_unregister_notifier(&nft_nl_notifier);
9881         nft_offload_exit();
9882         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9883         nft_chain_filter_fini();
9884         nft_chain_route_fini();
9885         unregister_pernet_subsys(&nf_tables_net_ops);
9886         cancel_work_sync(&trans_destroy_work);
9887         rcu_barrier();
9888         rhltable_destroy(&nft_objname_ht);
9889         nf_tables_core_module_exit();
9890 }
9891
9892 module_init(nf_tables_module_init);
9893 module_exit(nf_tables_module_exit);
9894
9895 MODULE_LICENSE("GPL");
9896 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
9897 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);