net/netfilter/nf_tables_api.c

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