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
  36 enum {
  37         NFT_VALIDATE_SKIP       = 0,
  38         NFT_VALIDATE_NEED,
  39         NFT_VALIDATE_DO,
  40 };
  41
  42 static struct rhltable nft_objname_ht;
  43
  44 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  45 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  46 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  47
  48 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  49 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  50 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  51
  52 static const struct rhashtable_params nft_chain_ht_params = {
  53         .head_offset            = offsetof(struct nft_chain, rhlhead),
  54         .key_offset             = offsetof(struct nft_chain, name),
  55         .hashfn                 = nft_chain_hash,
  56         .obj_hashfn             = nft_chain_hash_obj,
  57         .obj_cmpfn              = nft_chain_hash_cmp,
  58         .automatic_shrinking    = true,
  59 };
  60
  61 static const struct rhashtable_params nft_objname_ht_params = {
  62         .head_offset            = offsetof(struct nft_object, rhlhead),
  63         .key_offset             = offsetof(struct nft_object, key),
  64         .hashfn                 = nft_objname_hash,
  65         .obj_hashfn             = nft_objname_hash_obj,
  66         .obj_cmpfn              = nft_objname_hash_cmp,
  67         .automatic_shrinking    = true,
  68 };
  69
  70 struct nft_audit_data {
  71         struct nft_table *table;
  72         int entries;
  73         int op;
  74         struct list_head list;
  75 };
  76
  77 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  78         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  79         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  80         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  81         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  82         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  83         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  84         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  85         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  86         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  87         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  88         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  89         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  90         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  91         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  92         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  93         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  94         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  95         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  96         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
  97         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
  98         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
  99         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 100         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 101         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 102         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 103 };
 104
 105 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
 106 {
 107         switch (table->validate_state) {
 108         case NFT_VALIDATE_SKIP:
 109                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 110                 break;
 111         case NFT_VALIDATE_NEED:
 112                 break;
 113         case NFT_VALIDATE_DO:
 114                 if (new_validate_state == NFT_VALIDATE_NEED)
 115                         return;
 116         }
 117
 118         table->validate_state = new_validate_state;
 119 }
 120 static void nf_tables_trans_destroy_work(struct work_struct *w);
 121 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 122
 123 static void nft_ctx_init(struct nft_ctx *ctx,
 124                          struct net *net,
 125                          const struct sk_buff *skb,
 126                          const struct nlmsghdr *nlh,
 127                          u8 family,
 128                          struct nft_table *table,
 129                          struct nft_chain *chain,
 130                          const struct nlattr * const *nla)
 131 {
 132         ctx->net        = net;
 133         ctx->family     = family;
 134         ctx->level      = 0;
 135         ctx->table      = table;
 136         ctx->chain      = chain;
 137         ctx->nla        = nla;
 138         ctx->portid     = NETLINK_CB(skb).portid;
 139         ctx->report     = nlmsg_report(nlh);
 140         ctx->flags      = nlh->nlmsg_flags;
 141         ctx->seq        = nlh->nlmsg_seq;
 142 }
 143
 144 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 145                                              int msg_type, u32 size, gfp_t gfp)
 146 {
 147         struct nft_trans *trans;
 148
 149         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 150         if (trans == NULL)
 151                 return NULL;
 152
 153         INIT_LIST_HEAD(&trans->list);
 154         INIT_LIST_HEAD(&trans->binding_list);
 155         trans->msg_type = msg_type;
 156         trans->ctx      = *ctx;
 157
 158         return trans;
 159 }
 160
 161 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 162                                          int msg_type, u32 size)
 163 {
 164         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 165 }
 166
 167 static void nft_trans_list_del(struct nft_trans *trans)
 168 {
 169         list_del(&trans->list);
 170         list_del(&trans->binding_list);
 171 }
 172
 173 static void nft_trans_destroy(struct nft_trans *trans)
 174 {
 175         nft_trans_list_del(trans);
 176         kfree(trans);
 177 }
 178
 179 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
 180                                  bool bind)
 181 {
 182         struct nftables_pernet *nft_net;
 183         struct net *net = ctx->net;
 184         struct nft_trans *trans;
 185
 186         if (!nft_set_is_anonymous(set))
 187                 return;
 188
 189         nft_net = nft_pernet(net);
 190         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 191                 switch (trans->msg_type) {
 192                 case NFT_MSG_NEWSET:
 193                         if (nft_trans_set(trans) == set)
 194                                 nft_trans_set_bound(trans) = bind;
 195                         break;
 196                 case NFT_MSG_NEWSETELEM:
 197                         if (nft_trans_elem_set(trans) == set)
 198                                 nft_trans_elem_set_bound(trans) = bind;
 199                         break;
 200                 }
 201         }
 202 }
 203
 204 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 205 {
 206         return __nft_set_trans_bind(ctx, set, true);
 207 }
 208
 209 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
 210 {
 211         return __nft_set_trans_bind(ctx, set, false);
 212 }
 213
 214 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
 215                                    struct nft_chain *chain, bool bind)
 216 {
 217         struct nftables_pernet *nft_net;
 218         struct net *net = ctx->net;
 219         struct nft_trans *trans;
 220
 221         if (!nft_chain_binding(chain))
 222                 return;
 223
 224         nft_net = nft_pernet(net);
 225         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 226                 switch (trans->msg_type) {
 227                 case NFT_MSG_NEWCHAIN:
 228                         if (nft_trans_chain(trans) == chain)
 229                                 nft_trans_chain_bound(trans) = bind;
 230                         break;
 231                 case NFT_MSG_NEWRULE:
 232                         if (trans->ctx.chain == chain)
 233                                 nft_trans_rule_bound(trans) = bind;
 234                         break;
 235                 }
 236         }
 237 }
 238
 239 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
 240                                  struct nft_chain *chain)
 241 {
 242         __nft_chain_trans_bind(ctx, chain, true);
 243 }
 244
 245 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
 246 {
 247         if (!nft_chain_binding(chain))
 248                 return 0;
 249
 250         if (nft_chain_binding(ctx->chain))
 251                 return -EOPNOTSUPP;
 252
 253         if (chain->bound)
 254                 return -EBUSY;
 255
 256         chain->bound = true;
 257         chain->use++;
 258         nft_chain_trans_bind(ctx, chain);
 259
 260         return 0;
 261 }
 262
 263 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
 264 {
 265         __nft_chain_trans_bind(ctx, chain, false);
 266 }
 267
 268 static int nft_netdev_register_hooks(struct net *net,
 269                                      struct list_head *hook_list)
 270 {
 271         struct nft_hook *hook;
 272         int err, j;
 273
 274         j = 0;
 275         list_for_each_entry(hook, hook_list, list) {
 276                 err = nf_register_net_hook(net, &hook->ops);
 277                 if (err < 0)
 278                         goto err_register;
 279
 280                 j++;
 281         }
 282         return 0;
 283
 284 err_register:
 285         list_for_each_entry(hook, hook_list, list) {
 286                 if (j-- <= 0)
 287                         break;
 288
 289                 nf_unregister_net_hook(net, &hook->ops);
 290         }
 291         return err;
 292 }
 293
 294 static void nft_netdev_unregister_hooks(struct net *net,
 295                                         struct list_head *hook_list,
 296                                         bool release_netdev)
 297 {
 298         struct nft_hook *hook, *next;
 299
 300         list_for_each_entry_safe(hook, next, hook_list, list) {
 301                 nf_unregister_net_hook(net, &hook->ops);
 302                 if (release_netdev) {
 303                         list_del(&hook->list);
 304                         kfree_rcu(hook, rcu);
 305                 }
 306         }
 307 }
 308
 309 static int nf_tables_register_hook(struct net *net,
 310                                    const struct nft_table *table,
 311                                    struct nft_chain *chain)
 312 {
 313         struct nft_base_chain *basechain;
 314         const struct nf_hook_ops *ops;
 315
 316         if (table->flags & NFT_TABLE_F_DORMANT ||
 317             !nft_is_base_chain(chain))
 318                 return 0;
 319
 320         basechain = nft_base_chain(chain);
 321         ops = &basechain->ops;
 322
 323         if (basechain->type->ops_register)
 324                 return basechain->type->ops_register(net, ops);
 325
 326         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 327                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 328
 329         return nf_register_net_hook(net, &basechain->ops);
 330 }
 331
 332 static void __nf_tables_unregister_hook(struct net *net,
 333                                         const struct nft_table *table,
 334                                         struct nft_chain *chain,
 335                                         bool release_netdev)
 336 {
 337         struct nft_base_chain *basechain;
 338         const struct nf_hook_ops *ops;
 339
 340         if (table->flags & NFT_TABLE_F_DORMANT ||
 341             !nft_is_base_chain(chain))
 342                 return;
 343         basechain = nft_base_chain(chain);
 344         ops = &basechain->ops;
 345
 346         if (basechain->type->ops_unregister)
 347                 return basechain->type->ops_unregister(net, ops);
 348
 349         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 350                 nft_netdev_unregister_hooks(net, &basechain->hook_list,
 351                                             release_netdev);
 352         else
 353                 nf_unregister_net_hook(net, &basechain->ops);
 354 }
 355
 356 static void nf_tables_unregister_hook(struct net *net,
 357                                       const struct nft_table *table,
 358                                       struct nft_chain *chain)
 359 {
 360         return __nf_tables_unregister_hook(net, table, chain, false);
 361 }
 362
 363 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 364 {
 365         struct nftables_pernet *nft_net = nft_pernet(net);
 366
 367         switch (trans->msg_type) {
 368         case NFT_MSG_NEWSET:
 369                 if (!nft_trans_set_update(trans) &&
 370                     nft_set_is_anonymous(nft_trans_set(trans)))
 371                         list_add_tail(&trans->binding_list, &nft_net->binding_list);
 372                 break;
 373         case NFT_MSG_NEWCHAIN:
 374                 if (!nft_trans_chain_update(trans) &&
 375                     nft_chain_binding(nft_trans_chain(trans)))
 376                         list_add_tail(&trans->binding_list, &nft_net->binding_list);
 377                 break;
 378         }
 379
 380         list_add_tail(&trans->list, &nft_net->commit_list);
 381 }
 382
 383 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 384 {
 385         struct nft_trans *trans;
 386
 387         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 388         if (trans == NULL)
 389                 return -ENOMEM;
 390
 391         if (msg_type == NFT_MSG_NEWTABLE)
 392                 nft_activate_next(ctx->net, ctx->table);
 393
 394         nft_trans_commit_list_add_tail(ctx->net, trans);
 395         return 0;
 396 }
 397
 398 static int nft_deltable(struct nft_ctx *ctx)
 399 {
 400         int err;
 401
 402         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 403         if (err < 0)
 404                 return err;
 405
 406         nft_deactivate_next(ctx->net, ctx->table);
 407         return err;
 408 }
 409
 410 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 411 {
 412         struct nft_trans *trans;
 413
 414         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 415         if (trans == NULL)
 416                 return ERR_PTR(-ENOMEM);
 417
 418         if (msg_type == NFT_MSG_NEWCHAIN) {
 419                 nft_activate_next(ctx->net, ctx->chain);
 420
 421                 if (ctx->nla[NFTA_CHAIN_ID]) {
 422                         nft_trans_chain_id(trans) =
 423                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 424                 }
 425         }
 426         nft_trans_chain(trans) = ctx->chain;
 427         nft_trans_commit_list_add_tail(ctx->net, trans);
 428
 429         return trans;
 430 }
 431
 432 static int nft_delchain(struct nft_ctx *ctx)
 433 {
 434         struct nft_trans *trans;
 435
 436         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 437         if (IS_ERR(trans))
 438                 return PTR_ERR(trans);
 439
 440         ctx->table->use--;
 441         nft_deactivate_next(ctx->net, ctx->chain);
 442
 443         return 0;
 444 }
 445
 446 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
 447 {
 448         struct nft_expr *expr;
 449
 450         expr = nft_expr_first(rule);
 451         while (nft_expr_more(rule, expr)) {
 452                 if (expr->ops->activate)
 453                         expr->ops->activate(ctx, expr);
 454
 455                 expr = nft_expr_next(expr);
 456         }
 457 }
 458
 459 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
 460                               enum nft_trans_phase phase)
 461 {
 462         struct nft_expr *expr;
 463
 464         expr = nft_expr_first(rule);
 465         while (nft_expr_more(rule, expr)) {
 466                 if (expr->ops->deactivate)
 467                         expr->ops->deactivate(ctx, expr, phase);
 468
 469                 expr = nft_expr_next(expr);
 470         }
 471 }
 472
 473 static int
 474 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 475 {
 476         /* You cannot delete the same rule twice */
 477         if (nft_is_active_next(ctx->net, rule)) {
 478                 nft_deactivate_next(ctx->net, rule);
 479                 ctx->chain->use--;
 480                 return 0;
 481         }
 482         return -ENOENT;
 483 }
 484
 485 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 486                                             struct nft_rule *rule)
 487 {
 488         struct nft_trans *trans;
 489
 490         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 491         if (trans == NULL)
 492                 return NULL;
 493
 494         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 495                 nft_trans_rule_id(trans) =
 496                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 497         }
 498         nft_trans_rule(trans) = rule;
 499         nft_trans_commit_list_add_tail(ctx->net, trans);
 500
 501         return trans;
 502 }
 503
 504 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 505 {
 506         struct nft_flow_rule *flow;
 507         struct nft_trans *trans;
 508         int err;
 509
 510         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 511         if (trans == NULL)
 512                 return -ENOMEM;
 513
 514         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 515                 flow = nft_flow_rule_create(ctx->net, rule);
 516                 if (IS_ERR(flow)) {
 517                         nft_trans_destroy(trans);
 518                         return PTR_ERR(flow);
 519                 }
 520
 521                 nft_trans_flow_rule(trans) = flow;
 522         }
 523
 524         err = nf_tables_delrule_deactivate(ctx, rule);
 525         if (err < 0) {
 526                 nft_trans_destroy(trans);
 527                 return err;
 528         }
 529         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 530
 531         return 0;
 532 }
 533
 534 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 535 {
 536         struct nft_rule *rule;
 537         int err;
 538
 539         list_for_each_entry(rule, &ctx->chain->rules, list) {
 540                 if (!nft_is_active_next(ctx->net, rule))
 541                         continue;
 542
 543                 err = nft_delrule(ctx, rule);
 544                 if (err < 0)
 545                         return err;
 546         }
 547         return 0;
 548 }
 549
 550 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 551                                struct nft_set *set,
 552                                const struct nft_set_desc *desc)
 553 {
 554         struct nft_trans *trans;
 555
 556         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 557         if (trans == NULL)
 558                 return -ENOMEM;
 559
 560         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
 561                 nft_trans_set_id(trans) =
 562                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 563                 nft_activate_next(ctx->net, set);
 564         }
 565         nft_trans_set(trans) = set;
 566         if (desc) {
 567                 nft_trans_set_update(trans) = true;
 568                 nft_trans_set_gc_int(trans) = desc->gc_int;
 569                 nft_trans_set_timeout(trans) = desc->timeout;
 570                 nft_trans_set_size(trans) = desc->size;
 571         }
 572         nft_trans_commit_list_add_tail(ctx->net, trans);
 573
 574         return 0;
 575 }
 576
 577 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 578                              struct nft_set *set)
 579 {
 580         return __nft_trans_set_add(ctx, msg_type, set, NULL);
 581 }
 582
 583 static void nft_setelem_data_deactivate(const struct net *net,
 584                                         const struct nft_set *set,
 585                                         struct nft_set_elem *elem);
 586
 587 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
 588                                   struct nft_set *set,
 589                                   const struct nft_set_iter *iter,
 590                                   struct nft_set_elem *elem)
 591 {
 592         nft_setelem_data_deactivate(ctx->net, set, elem);
 593
 594         return 0;
 595 }
 596
 597 struct nft_set_elem_catchall {
 598         struct list_head        list;
 599         struct rcu_head         rcu;
 600         void                    *elem;
 601 };
 602
 603 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
 604                                         struct nft_set *set)
 605 {
 606         u8 genmask = nft_genmask_next(ctx->net);
 607         struct nft_set_elem_catchall *catchall;
 608         struct nft_set_elem elem;
 609         struct nft_set_ext *ext;
 610
 611         list_for_each_entry(catchall, &set->catchall_list, list) {
 612                 ext = nft_set_elem_ext(set, catchall->elem);
 613                 if (!nft_set_elem_active(ext, genmask))
 614                         continue;
 615
 616                 elem.priv = catchall->elem;
 617                 nft_setelem_data_deactivate(ctx->net, set, &elem);
 618                 break;
 619         }
 620 }
 621
 622 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
 623 {
 624         struct nft_set_iter iter = {
 625                 .genmask        = nft_genmask_next(ctx->net),
 626                 .fn             = nft_mapelem_deactivate,
 627         };
 628
 629         set->ops->walk(ctx, set, &iter);
 630         WARN_ON_ONCE(iter.err);
 631
 632         nft_map_catchall_deactivate(ctx, set);
 633 }
 634
 635 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 636 {
 637         int err;
 638
 639         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 640         if (err < 0)
 641                 return err;
 642
 643         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
 644                 nft_map_deactivate(ctx, set);
 645
 646         nft_deactivate_next(ctx->net, set);
 647         ctx->table->use--;
 648
 649         return err;
 650 }
 651
 652 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 653                              struct nft_object *obj)
 654 {
 655         struct nft_trans *trans;
 656
 657         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 658         if (trans == NULL)
 659                 return -ENOMEM;
 660
 661         if (msg_type == NFT_MSG_NEWOBJ)
 662                 nft_activate_next(ctx->net, obj);
 663
 664         nft_trans_obj(trans) = obj;
 665         nft_trans_commit_list_add_tail(ctx->net, trans);
 666
 667         return 0;
 668 }
 669
 670 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 671 {
 672         int err;
 673
 674         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 675         if (err < 0)
 676                 return err;
 677
 678         nft_deactivate_next(ctx->net, obj);
 679         ctx->table->use--;
 680
 681         return err;
 682 }
 683
 684 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 685                                    struct nft_flowtable *flowtable)
 686 {
 687         struct nft_trans *trans;
 688
 689         trans = nft_trans_alloc(ctx, msg_type,
 690                                 sizeof(struct nft_trans_flowtable));
 691         if (trans == NULL)
 692                 return -ENOMEM;
 693
 694         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 695                 nft_activate_next(ctx->net, flowtable);
 696
 697         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
 698         nft_trans_flowtable(trans) = flowtable;
 699         nft_trans_commit_list_add_tail(ctx->net, trans);
 700
 701         return 0;
 702 }
 703
 704 static int nft_delflowtable(struct nft_ctx *ctx,
 705                             struct nft_flowtable *flowtable)
 706 {
 707         int err;
 708
 709         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 710         if (err < 0)
 711                 return err;
 712
 713         nft_deactivate_next(ctx->net, flowtable);
 714         ctx->table->use--;
 715
 716         return err;
 717 }
 718
 719 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
 720 {
 721         int i;
 722
 723         for (i = track->regs[dreg].num_reg; i > 0; i--)
 724                 __nft_reg_track_cancel(track, dreg - i);
 725 }
 726
 727 static void __nft_reg_track_update(struct nft_regs_track *track,
 728                                    const struct nft_expr *expr,
 729                                    u8 dreg, u8 num_reg)
 730 {
 731         track->regs[dreg].selector = expr;
 732         track->regs[dreg].bitwise = NULL;
 733         track->regs[dreg].num_reg = num_reg;
 734 }
 735
 736 void nft_reg_track_update(struct nft_regs_track *track,
 737                           const struct nft_expr *expr, u8 dreg, u8 len)
 738 {
 739         unsigned int regcount;
 740         int i;
 741
 742         __nft_reg_track_clobber(track, dreg);
 743
 744         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 745         for (i = 0; i < regcount; i++, dreg++)
 746                 __nft_reg_track_update(track, expr, dreg, i);
 747 }
 748 EXPORT_SYMBOL_GPL(nft_reg_track_update);
 749
 750 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
 751 {
 752         unsigned int regcount;
 753         int i;
 754
 755         __nft_reg_track_clobber(track, dreg);
 756
 757         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 758         for (i = 0; i < regcount; i++, dreg++)
 759                 __nft_reg_track_cancel(track, dreg);
 760 }
 761 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
 762
 763 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
 764 {
 765         track->regs[dreg].selector = NULL;
 766         track->regs[dreg].bitwise = NULL;
 767         track->regs[dreg].num_reg = 0;
 768 }
 769 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
 770
 771 /*
 772  * Tables
 773  */
 774
 775 static struct nft_table *nft_table_lookup(const struct net *net,
 776                                           const struct nlattr *nla,
 777                                           u8 family, u8 genmask, u32 nlpid)
 778 {
 779         struct nftables_pernet *nft_net;
 780         struct nft_table *table;
 781
 782         if (nla == NULL)
 783                 return ERR_PTR(-EINVAL);
 784
 785         nft_net = nft_pernet(net);
 786         list_for_each_entry_rcu(table, &nft_net->tables, list,
 787                                 lockdep_is_held(&nft_net->commit_mutex)) {
 788                 if (!nla_strcmp(nla, table->name) &&
 789                     table->family == family &&
 790                     nft_active_genmask(table, genmask)) {
 791                         if (nft_table_has_owner(table) &&
 792                             nlpid && table->nlpid != nlpid)
 793                                 return ERR_PTR(-EPERM);
 794
 795                         return table;
 796                 }
 797         }
 798
 799         return ERR_PTR(-ENOENT);
 800 }
 801
 802 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 803                                                    const struct nlattr *nla,
 804                                                    u8 genmask, u32 nlpid)
 805 {
 806         struct nftables_pernet *nft_net;
 807         struct nft_table *table;
 808
 809         nft_net = nft_pernet(net);
 810         list_for_each_entry(table, &nft_net->tables, list) {
 811                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 812                     nft_active_genmask(table, genmask)) {
 813                         if (nft_table_has_owner(table) &&
 814                             nlpid && table->nlpid != nlpid)
 815                                 return ERR_PTR(-EPERM);
 816
 817                         return table;
 818                 }
 819         }
 820
 821         return ERR_PTR(-ENOENT);
 822 }
 823
 824 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 825 {
 826         return ++table->hgenerator;
 827 }
 828
 829 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 830
 831 static const struct nft_chain_type *
 832 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 833 {
 834         if (family >= NFPROTO_NUMPROTO ||
 835             type >= NFT_CHAIN_T_MAX)
 836                 return NULL;
 837
 838         return chain_type[family][type];
 839 }
 840
 841 static const struct nft_chain_type *
 842 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 843 {
 844         const struct nft_chain_type *type;
 845         int i;
 846
 847         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 848                 type = __nft_chain_type_get(family, i);
 849                 if (!type)
 850                         continue;
 851                 if (!nla_strcmp(nla, type->name))
 852                         return type;
 853         }
 854         return NULL;
 855 }
 856
 857 struct nft_module_request {
 858         struct list_head        list;
 859         char                    module[MODULE_NAME_LEN];
 860         bool                    done;
 861 };
 862
 863 #ifdef CONFIG_MODULES
 864 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 865                                       ...)
 866 {
 867         char module_name[MODULE_NAME_LEN];
 868         struct nftables_pernet *nft_net;
 869         struct nft_module_request *req;
 870         va_list args;
 871         int ret;
 872
 873         va_start(args, fmt);
 874         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 875         va_end(args);
 876         if (ret >= MODULE_NAME_LEN)
 877                 return 0;
 878
 879         nft_net = nft_pernet(net);
 880         list_for_each_entry(req, &nft_net->module_list, list) {
 881                 if (!strcmp(req->module, module_name)) {
 882                         if (req->done)
 883                                 return 0;
 884
 885                         /* A request to load this module already exists. */
 886                         return -EAGAIN;
 887                 }
 888         }
 889
 890         req = kmalloc(sizeof(*req), GFP_KERNEL);
 891         if (!req)
 892                 return -ENOMEM;
 893
 894         req->done = false;
 895         strscpy(req->module, module_name, MODULE_NAME_LEN);
 896         list_add_tail(&req->list, &nft_net->module_list);
 897
 898         return -EAGAIN;
 899 }
 900 EXPORT_SYMBOL_GPL(nft_request_module);
 901 #endif
 902
 903 static void lockdep_nfnl_nft_mutex_not_held(void)
 904 {
 905 #ifdef CONFIG_PROVE_LOCKING
 906         if (debug_locks)
 907                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 908 #endif
 909 }
 910
 911 static const struct nft_chain_type *
 912 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 913                             u8 family, bool autoload)
 914 {
 915         const struct nft_chain_type *type;
 916
 917         type = __nf_tables_chain_type_lookup(nla, family);
 918         if (type != NULL)
 919                 return type;
 920
 921         lockdep_nfnl_nft_mutex_not_held();
 922 #ifdef CONFIG_MODULES
 923         if (autoload) {
 924                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 925                                        nla_len(nla),
 926                                        (const char *)nla_data(nla)) == -EAGAIN)
 927                         return ERR_PTR(-EAGAIN);
 928         }
 929 #endif
 930         return ERR_PTR(-ENOENT);
 931 }
 932
 933 static __be16 nft_base_seq(const struct net *net)
 934 {
 935         struct nftables_pernet *nft_net = nft_pernet(net);
 936
 937         return htons(nft_net->base_seq & 0xffff);
 938 }
 939
 940 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 941         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 942                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 943         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 944         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 945         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 946                                     .len = NFT_USERDATA_MAXLEN }
 947 };
 948
 949 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 950                                      u32 portid, u32 seq, int event, u32 flags,
 951                                      int family, const struct nft_table *table)
 952 {
 953         struct nlmsghdr *nlh;
 954
 955         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 956         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 957                            NFNETLINK_V0, nft_base_seq(net));
 958         if (!nlh)
 959                 goto nla_put_failure;
 960
 961         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 962             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 963             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 964                          NFTA_TABLE_PAD))
 965                 goto nla_put_failure;
 966
 967         if (event == NFT_MSG_DELTABLE) {
 968                 nlmsg_end(skb, nlh);
 969                 return 0;
 970         }
 971
 972         if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
 973                          htonl(table->flags & NFT_TABLE_F_MASK)))
 974                 goto nla_put_failure;
 975
 976         if (nft_table_has_owner(table) &&
 977             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 978                 goto nla_put_failure;
 979
 980         if (table->udata) {
 981                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 982                         goto nla_put_failure;
 983         }
 984
 985         nlmsg_end(skb, nlh);
 986         return 0;
 987
 988 nla_put_failure:
 989         nlmsg_trim(skb, nlh);
 990         return -1;
 991 }
 992
 993 struct nftnl_skb_parms {
 994         bool report;
 995 };
 996 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 997
 998 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 999                                struct list_head *notify_list)
1000 {
1001         NFT_CB(skb).report = report;
1002         list_add_tail(&skb->list, notify_list);
1003 }
1004
1005 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
1006 {
1007         struct nftables_pernet *nft_net;
1008         struct sk_buff *skb;
1009         u16 flags = 0;
1010         int err;
1011
1012         if (!ctx->report &&
1013             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1014                 return;
1015
1016         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1017         if (skb == NULL)
1018                 goto err;
1019
1020         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1021                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1022
1023         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
1024                                         event, flags, ctx->family, ctx->table);
1025         if (err < 0) {
1026                 kfree_skb(skb);
1027                 goto err;
1028         }
1029
1030         nft_net = nft_pernet(ctx->net);
1031         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1032         return;
1033 err:
1034         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1035 }
1036
1037 static int nf_tables_dump_tables(struct sk_buff *skb,
1038                                  struct netlink_callback *cb)
1039 {
1040         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1041         struct nftables_pernet *nft_net;
1042         const struct nft_table *table;
1043         unsigned int idx = 0, s_idx = cb->args[0];
1044         struct net *net = sock_net(skb->sk);
1045         int family = nfmsg->nfgen_family;
1046
1047         rcu_read_lock();
1048         nft_net = nft_pernet(net);
1049         cb->seq = READ_ONCE(nft_net->base_seq);
1050
1051         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1052                 if (family != NFPROTO_UNSPEC && family != table->family)
1053                         continue;
1054
1055                 if (idx < s_idx)
1056                         goto cont;
1057                 if (idx > s_idx)
1058                         memset(&cb->args[1], 0,
1059                                sizeof(cb->args) - sizeof(cb->args[0]));
1060                 if (!nft_is_active(net, table))
1061                         continue;
1062                 if (nf_tables_fill_table_info(skb, net,
1063                                               NETLINK_CB(cb->skb).portid,
1064                                               cb->nlh->nlmsg_seq,
1065                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
1066                                               table->family, table) < 0)
1067                         goto done;
1068
1069                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1070 cont:
1071                 idx++;
1072         }
1073 done:
1074         rcu_read_unlock();
1075         cb->args[0] = idx;
1076         return skb->len;
1077 }
1078
1079 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1080                                       const struct nlmsghdr *nlh,
1081                                       struct netlink_dump_control *c)
1082 {
1083         int err;
1084
1085         if (!try_module_get(THIS_MODULE))
1086                 return -EINVAL;
1087
1088         rcu_read_unlock();
1089         err = netlink_dump_start(nlsk, skb, nlh, c);
1090         rcu_read_lock();
1091         module_put(THIS_MODULE);
1092
1093         return err;
1094 }
1095
1096 /* called with rcu_read_lock held */
1097 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1098                               const struct nlattr * const nla[])
1099 {
1100         struct netlink_ext_ack *extack = info->extack;
1101         u8 genmask = nft_genmask_cur(info->net);
1102         u8 family = info->nfmsg->nfgen_family;
1103         const struct nft_table *table;
1104         struct net *net = info->net;
1105         struct sk_buff *skb2;
1106         int err;
1107
1108         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1109                 struct netlink_dump_control c = {
1110                         .dump = nf_tables_dump_tables,
1111                         .module = THIS_MODULE,
1112                 };
1113
1114                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1115         }
1116
1117         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1118         if (IS_ERR(table)) {
1119                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1120                 return PTR_ERR(table);
1121         }
1122
1123         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1124         if (!skb2)
1125                 return -ENOMEM;
1126
1127         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1128                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1129                                         0, family, table);
1130         if (err < 0)
1131                 goto err_fill_table_info;
1132
1133         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1134
1135 err_fill_table_info:
1136         kfree_skb(skb2);
1137         return err;
1138 }
1139
1140 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1141 {
1142         struct nft_chain *chain;
1143         u32 i = 0;
1144
1145         list_for_each_entry(chain, &table->chains, list) {
1146                 if (!nft_is_active_next(net, chain))
1147                         continue;
1148                 if (!nft_is_base_chain(chain))
1149                         continue;
1150
1151                 if (cnt && i++ == cnt)
1152                         break;
1153
1154                 nf_tables_unregister_hook(net, table, chain);
1155         }
1156 }
1157
1158 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1159 {
1160         struct nft_chain *chain;
1161         int err, i = 0;
1162
1163         list_for_each_entry(chain, &table->chains, list) {
1164                 if (!nft_is_active_next(net, chain))
1165                         continue;
1166                 if (!nft_is_base_chain(chain))
1167                         continue;
1168
1169                 err = nf_tables_register_hook(net, table, chain);
1170                 if (err < 0)
1171                         goto err_register_hooks;
1172
1173                 i++;
1174         }
1175         return 0;
1176
1177 err_register_hooks:
1178         if (i)
1179                 nft_table_disable(net, table, i);
1180         return err;
1181 }
1182
1183 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1184 {
1185         table->flags &= ~NFT_TABLE_F_DORMANT;
1186         nft_table_disable(net, table, 0);
1187         table->flags |= NFT_TABLE_F_DORMANT;
1188 }
1189
1190 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
1191 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
1192 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
1193 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
1194                                          __NFT_TABLE_F_WAS_AWAKEN)
1195
1196 static int nf_tables_updtable(struct nft_ctx *ctx)
1197 {
1198         struct nft_trans *trans;
1199         u32 flags;
1200         int ret;
1201
1202         if (!ctx->nla[NFTA_TABLE_FLAGS])
1203                 return 0;
1204
1205         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1206         if (flags & ~NFT_TABLE_F_MASK)
1207                 return -EOPNOTSUPP;
1208
1209         if (flags == ctx->table->flags)
1210                 return 0;
1211
1212         if ((nft_table_has_owner(ctx->table) &&
1213              !(flags & NFT_TABLE_F_OWNER)) ||
1214             (!nft_table_has_owner(ctx->table) &&
1215              flags & NFT_TABLE_F_OWNER))
1216                 return -EOPNOTSUPP;
1217
1218         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1219                                 sizeof(struct nft_trans_table));
1220         if (trans == NULL)
1221                 return -ENOMEM;
1222
1223         if ((flags & NFT_TABLE_F_DORMANT) &&
1224             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1225                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1226                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1227                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1228         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1229                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1230                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1231                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1232                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1233                         if (ret < 0)
1234                                 goto err_register_hooks;
1235
1236                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1237                 }
1238         }
1239
1240         nft_trans_table_update(trans) = true;
1241         nft_trans_commit_list_add_tail(ctx->net, trans);
1242
1243         return 0;
1244
1245 err_register_hooks:
1246         nft_trans_destroy(trans);
1247         return ret;
1248 }
1249
1250 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1251 {
1252         const char *name = data;
1253
1254         return jhash(name, strlen(name), seed);
1255 }
1256
1257 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1258 {
1259         const struct nft_chain *chain = data;
1260
1261         return nft_chain_hash(chain->name, 0, seed);
1262 }
1263
1264 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1265                               const void *ptr)
1266 {
1267         const struct nft_chain *chain = ptr;
1268         const char *name = arg->key;
1269
1270         return strcmp(chain->name, name);
1271 }
1272
1273 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1274 {
1275         const struct nft_object_hash_key *k = data;
1276
1277         seed ^= hash_ptr(k->table, 32);
1278
1279         return jhash(k->name, strlen(k->name), seed);
1280 }
1281
1282 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1283 {
1284         const struct nft_object *obj = data;
1285
1286         return nft_objname_hash(&obj->key, 0, seed);
1287 }
1288
1289 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1290                                 const void *ptr)
1291 {
1292         const struct nft_object_hash_key *k = arg->key;
1293         const struct nft_object *obj = ptr;
1294
1295         if (obj->key.table != k->table)
1296                 return -1;
1297
1298         return strcmp(obj->key.name, k->name);
1299 }
1300
1301 static bool nft_supported_family(u8 family)
1302 {
1303         return false
1304 #ifdef CONFIG_NF_TABLES_INET
1305                 || family == NFPROTO_INET
1306 #endif
1307 #ifdef CONFIG_NF_TABLES_IPV4
1308                 || family == NFPROTO_IPV4
1309 #endif
1310 #ifdef CONFIG_NF_TABLES_ARP
1311                 || family == NFPROTO_ARP
1312 #endif
1313 #ifdef CONFIG_NF_TABLES_NETDEV
1314                 || family == NFPROTO_NETDEV
1315 #endif
1316 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1317                 || family == NFPROTO_BRIDGE
1318 #endif
1319 #ifdef CONFIG_NF_TABLES_IPV6
1320                 || family == NFPROTO_IPV6
1321 #endif
1322                 ;
1323 }
1324
1325 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1326                               const struct nlattr * const nla[])
1327 {
1328         struct nftables_pernet *nft_net = nft_pernet(info->net);
1329         struct netlink_ext_ack *extack = info->extack;
1330         u8 genmask = nft_genmask_next(info->net);
1331         u8 family = info->nfmsg->nfgen_family;
1332         struct net *net = info->net;
1333         const struct nlattr *attr;
1334         struct nft_table *table;
1335         struct nft_ctx ctx;
1336         u32 flags = 0;
1337         int err;
1338
1339         if (!nft_supported_family(family))
1340                 return -EOPNOTSUPP;
1341
1342         lockdep_assert_held(&nft_net->commit_mutex);
1343         attr = nla[NFTA_TABLE_NAME];
1344         table = nft_table_lookup(net, attr, family, genmask,
1345                                  NETLINK_CB(skb).portid);
1346         if (IS_ERR(table)) {
1347                 if (PTR_ERR(table) != -ENOENT)
1348                         return PTR_ERR(table);
1349         } else {
1350                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1351                         NL_SET_BAD_ATTR(extack, attr);
1352                         return -EEXIST;
1353                 }
1354                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1355                         return -EOPNOTSUPP;
1356
1357                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1358
1359                 return nf_tables_updtable(&ctx);
1360         }
1361
1362         if (nla[NFTA_TABLE_FLAGS]) {
1363                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1364                 if (flags & ~NFT_TABLE_F_MASK)
1365                         return -EOPNOTSUPP;
1366         }
1367
1368         err = -ENOMEM;
1369         table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1370         if (table == NULL)
1371                 goto err_kzalloc;
1372
1373         table->validate_state = NFT_VALIDATE_SKIP;
1374         table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1375         if (table->name == NULL)
1376                 goto err_strdup;
1377
1378         if (nla[NFTA_TABLE_USERDATA]) {
1379                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1380                 if (table->udata == NULL)
1381                         goto err_table_udata;
1382
1383                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1384         }
1385
1386         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1387         if (err)
1388                 goto err_chain_ht;
1389
1390         INIT_LIST_HEAD(&table->chains);
1391         INIT_LIST_HEAD(&table->sets);
1392         INIT_LIST_HEAD(&table->objects);
1393         INIT_LIST_HEAD(&table->flowtables);
1394         table->family = family;
1395         table->flags = flags;
1396         table->handle = ++nft_net->table_handle;
1397         if (table->flags & NFT_TABLE_F_OWNER)
1398                 table->nlpid = NETLINK_CB(skb).portid;
1399
1400         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1401         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1402         if (err < 0)
1403                 goto err_trans;
1404
1405         list_add_tail_rcu(&table->list, &nft_net->tables);
1406         return 0;
1407 err_trans:
1408         rhltable_destroy(&table->chains_ht);
1409 err_chain_ht:
1410         kfree(table->udata);
1411 err_table_udata:
1412         kfree(table->name);
1413 err_strdup:
1414         kfree(table);
1415 err_kzalloc:
1416         return err;
1417 }
1418
1419 static int nft_flush_table(struct nft_ctx *ctx)
1420 {
1421         struct nft_flowtable *flowtable, *nft;
1422         struct nft_chain *chain, *nc;
1423         struct nft_object *obj, *ne;
1424         struct nft_set *set, *ns;
1425         int err;
1426
1427         list_for_each_entry(chain, &ctx->table->chains, list) {
1428                 if (!nft_is_active_next(ctx->net, chain))
1429                         continue;
1430
1431                 if (nft_chain_is_bound(chain))
1432                         continue;
1433
1434                 ctx->chain = chain;
1435
1436                 err = nft_delrule_by_chain(ctx);
1437                 if (err < 0)
1438                         goto out;
1439         }
1440
1441         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1442                 if (!nft_is_active_next(ctx->net, set))
1443                         continue;
1444
1445                 if (nft_set_is_anonymous(set) &&
1446                     !list_empty(&set->bindings))
1447                         continue;
1448
1449                 err = nft_delset(ctx, set);
1450                 if (err < 0)
1451                         goto out;
1452         }
1453
1454         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1455                 if (!nft_is_active_next(ctx->net, flowtable))
1456                         continue;
1457
1458                 err = nft_delflowtable(ctx, flowtable);
1459                 if (err < 0)
1460                         goto out;
1461         }
1462
1463         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1464                 if (!nft_is_active_next(ctx->net, obj))
1465                         continue;
1466
1467                 err = nft_delobj(ctx, obj);
1468                 if (err < 0)
1469                         goto out;
1470         }
1471
1472         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1473                 if (!nft_is_active_next(ctx->net, chain))
1474                         continue;
1475
1476                 if (nft_chain_is_bound(chain))
1477                         continue;
1478
1479                 ctx->chain = chain;
1480
1481                 err = nft_delchain(ctx);
1482                 if (err < 0)
1483                         goto out;
1484         }
1485
1486         err = nft_deltable(ctx);
1487 out:
1488         return err;
1489 }
1490
1491 static int nft_flush(struct nft_ctx *ctx, int family)
1492 {
1493         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1494         const struct nlattr * const *nla = ctx->nla;
1495         struct nft_table *table, *nt;
1496         int err = 0;
1497
1498         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1499                 if (family != AF_UNSPEC && table->family != family)
1500                         continue;
1501
1502                 ctx->family = table->family;
1503
1504                 if (!nft_is_active_next(ctx->net, table))
1505                         continue;
1506
1507                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1508                         continue;
1509
1510                 if (nla[NFTA_TABLE_NAME] &&
1511                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1512                         continue;
1513
1514                 ctx->table = table;
1515
1516                 err = nft_flush_table(ctx);
1517                 if (err < 0)
1518                         goto out;
1519         }
1520 out:
1521         return err;
1522 }
1523
1524 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1525                               const struct nlattr * const nla[])
1526 {
1527         struct netlink_ext_ack *extack = info->extack;
1528         u8 genmask = nft_genmask_next(info->net);
1529         u8 family = info->nfmsg->nfgen_family;
1530         struct net *net = info->net;
1531         const struct nlattr *attr;
1532         struct nft_table *table;
1533         struct nft_ctx ctx;
1534
1535         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1536         if (family == AF_UNSPEC ||
1537             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1538                 return nft_flush(&ctx, family);
1539
1540         if (nla[NFTA_TABLE_HANDLE]) {
1541                 attr = nla[NFTA_TABLE_HANDLE];
1542                 table = nft_table_lookup_byhandle(net, attr, genmask,
1543                                                   NETLINK_CB(skb).portid);
1544         } else {
1545                 attr = nla[NFTA_TABLE_NAME];
1546                 table = nft_table_lookup(net, attr, family, genmask,
1547                                          NETLINK_CB(skb).portid);
1548         }
1549
1550         if (IS_ERR(table)) {
1551                 if (PTR_ERR(table) == -ENOENT &&
1552                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1553                         return 0;
1554
1555                 NL_SET_BAD_ATTR(extack, attr);
1556                 return PTR_ERR(table);
1557         }
1558
1559         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1560             table->use > 0)
1561                 return -EBUSY;
1562
1563         ctx.family = family;
1564         ctx.table = table;
1565
1566         return nft_flush_table(&ctx);
1567 }
1568
1569 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1570 {
1571         if (WARN_ON(ctx->table->use > 0))
1572                 return;
1573
1574         rhltable_destroy(&ctx->table->chains_ht);
1575         kfree(ctx->table->name);
1576         kfree(ctx->table->udata);
1577         kfree(ctx->table);
1578 }
1579
1580 void nft_register_chain_type(const struct nft_chain_type *ctype)
1581 {
1582         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1583         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1584                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1585                 return;
1586         }
1587         chain_type[ctype->family][ctype->type] = ctype;
1588         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1589 }
1590 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1591
1592 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1593 {
1594         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1595         chain_type[ctype->family][ctype->type] = NULL;
1596         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1597 }
1598 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1599
1600 /*
1601  * Chains
1602  */
1603
1604 static struct nft_chain *
1605 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1606 {
1607         struct nft_chain *chain;
1608
1609         list_for_each_entry(chain, &table->chains, list) {
1610                 if (chain->handle == handle &&
1611                     nft_active_genmask(chain, genmask))
1612                         return chain;
1613         }
1614
1615         return ERR_PTR(-ENOENT);
1616 }
1617
1618 static bool lockdep_commit_lock_is_held(const struct net *net)
1619 {
1620 #ifdef CONFIG_PROVE_LOCKING
1621         struct nftables_pernet *nft_net = nft_pernet(net);
1622
1623         return lockdep_is_held(&nft_net->commit_mutex);
1624 #else
1625         return true;
1626 #endif
1627 }
1628
1629 static struct nft_chain *nft_chain_lookup(struct net *net,
1630                                           struct nft_table *table,
1631                                           const struct nlattr *nla, u8 genmask)
1632 {
1633         char search[NFT_CHAIN_MAXNAMELEN + 1];
1634         struct rhlist_head *tmp, *list;
1635         struct nft_chain *chain;
1636
1637         if (nla == NULL)
1638                 return ERR_PTR(-EINVAL);
1639
1640         nla_strscpy(search, nla, sizeof(search));
1641
1642         WARN_ON(!rcu_read_lock_held() &&
1643                 !lockdep_commit_lock_is_held(net));
1644
1645         chain = ERR_PTR(-ENOENT);
1646         rcu_read_lock();
1647         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1648         if (!list)
1649                 goto out_unlock;
1650
1651         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1652                 if (nft_active_genmask(chain, genmask))
1653                         goto out_unlock;
1654         }
1655         chain = ERR_PTR(-ENOENT);
1656 out_unlock:
1657         rcu_read_unlock();
1658         return chain;
1659 }
1660
1661 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1662         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1663                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1664         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1665         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1666                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1667         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1668         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1669         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1670                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1671         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1672         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1673         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1674         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1675                                     .len = NFT_USERDATA_MAXLEN },
1676 };
1677
1678 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1679         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1680         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1681         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1682                                     .len = IFNAMSIZ - 1 },
1683 };
1684
1685 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1686 {
1687         struct nft_stats *cpu_stats, total;
1688         struct nlattr *nest;
1689         unsigned int seq;
1690         u64 pkts, bytes;
1691         int cpu;
1692
1693         if (!stats)
1694                 return 0;
1695
1696         memset(&total, 0, sizeof(total));
1697         for_each_possible_cpu(cpu) {
1698                 cpu_stats = per_cpu_ptr(stats, cpu);
1699                 do {
1700                         seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1701                         pkts = cpu_stats->pkts;
1702                         bytes = cpu_stats->bytes;
1703                 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1704                 total.pkts += pkts;
1705                 total.bytes += bytes;
1706         }
1707         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1708         if (nest == NULL)
1709                 goto nla_put_failure;
1710
1711         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1712                          NFTA_COUNTER_PAD) ||
1713             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1714                          NFTA_COUNTER_PAD))
1715                 goto nla_put_failure;
1716
1717         nla_nest_end(skb, nest);
1718         return 0;
1719
1720 nla_put_failure:
1721         return -ENOSPC;
1722 }
1723
1724 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1725                                    const struct nft_base_chain *basechain,
1726                                    const struct list_head *hook_list)
1727 {
1728         const struct nf_hook_ops *ops = &basechain->ops;
1729         struct nft_hook *hook, *first = NULL;
1730         struct nlattr *nest, *nest_devs;
1731         int n = 0;
1732
1733         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1734         if (nest == NULL)
1735                 goto nla_put_failure;
1736         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1737                 goto nla_put_failure;
1738         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1739                 goto nla_put_failure;
1740
1741         if (nft_base_chain_netdev(family, ops->hooknum)) {
1742                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1743                 if (!nest_devs)
1744                         goto nla_put_failure;
1745
1746                 if (!hook_list)
1747                         hook_list = &basechain->hook_list;
1748
1749                 list_for_each_entry(hook, hook_list, list) {
1750                         if (!first)
1751                                 first = hook;
1752
1753                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1754                                            hook->ops.dev->name))
1755                                 goto nla_put_failure;
1756                         n++;
1757                 }
1758                 nla_nest_end(skb, nest_devs);
1759
1760                 if (n == 1 &&
1761                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1762                         goto nla_put_failure;
1763         }
1764         nla_nest_end(skb, nest);
1765
1766         return 0;
1767 nla_put_failure:
1768         return -1;
1769 }
1770
1771 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1772                                      u32 portid, u32 seq, int event, u32 flags,
1773                                      int family, const struct nft_table *table,
1774                                      const struct nft_chain *chain,
1775                                      const struct list_head *hook_list)
1776 {
1777         struct nlmsghdr *nlh;
1778
1779         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1780         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1781                            NFNETLINK_V0, nft_base_seq(net));
1782         if (!nlh)
1783                 goto nla_put_failure;
1784
1785         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1786             nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1787             nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1788                          NFTA_CHAIN_PAD))
1789                 goto nla_put_failure;
1790
1791         if (event == NFT_MSG_DELCHAIN && !hook_list) {
1792                 nlmsg_end(skb, nlh);
1793                 return 0;
1794         }
1795
1796         if (nft_is_base_chain(chain)) {
1797                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1798                 struct nft_stats __percpu *stats;
1799
1800                 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1801                         goto nla_put_failure;
1802
1803                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1804                                  htonl(basechain->policy)))
1805                         goto nla_put_failure;
1806
1807                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1808                         goto nla_put_failure;
1809
1810                 stats = rcu_dereference_check(basechain->stats,
1811                                               lockdep_commit_lock_is_held(net));
1812                 if (nft_dump_stats(skb, stats))
1813                         goto nla_put_failure;
1814         }
1815
1816         if (chain->flags &&
1817             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1818                 goto nla_put_failure;
1819
1820         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1821                 goto nla_put_failure;
1822
1823         if (chain->udata &&
1824             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1825                 goto nla_put_failure;
1826
1827         nlmsg_end(skb, nlh);
1828         return 0;
1829
1830 nla_put_failure:
1831         nlmsg_trim(skb, nlh);
1832         return -1;
1833 }
1834
1835 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1836                                    const struct list_head *hook_list)
1837 {
1838         struct nftables_pernet *nft_net;
1839         struct sk_buff *skb;
1840         u16 flags = 0;
1841         int err;
1842
1843         if (!ctx->report &&
1844             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1845                 return;
1846
1847         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1848         if (skb == NULL)
1849                 goto err;
1850
1851         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1852                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1853
1854         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1855                                         event, flags, ctx->family, ctx->table,
1856                                         ctx->chain, hook_list);
1857         if (err < 0) {
1858                 kfree_skb(skb);
1859                 goto err;
1860         }
1861
1862         nft_net = nft_pernet(ctx->net);
1863         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1864         return;
1865 err:
1866         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1867 }
1868
1869 static int nf_tables_dump_chains(struct sk_buff *skb,
1870                                  struct netlink_callback *cb)
1871 {
1872         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1873         unsigned int idx = 0, s_idx = cb->args[0];
1874         struct net *net = sock_net(skb->sk);
1875         int family = nfmsg->nfgen_family;
1876         struct nftables_pernet *nft_net;
1877         const struct nft_table *table;
1878         const struct nft_chain *chain;
1879
1880         rcu_read_lock();
1881         nft_net = nft_pernet(net);
1882         cb->seq = READ_ONCE(nft_net->base_seq);
1883
1884         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1885                 if (family != NFPROTO_UNSPEC && family != table->family)
1886                         continue;
1887
1888                 list_for_each_entry_rcu(chain, &table->chains, list) {
1889                         if (idx < s_idx)
1890                                 goto cont;
1891                         if (idx > s_idx)
1892                                 memset(&cb->args[1], 0,
1893                                        sizeof(cb->args) - sizeof(cb->args[0]));
1894                         if (!nft_is_active(net, chain))
1895                                 continue;
1896                         if (nf_tables_fill_chain_info(skb, net,
1897                                                       NETLINK_CB(cb->skb).portid,
1898                                                       cb->nlh->nlmsg_seq,
1899                                                       NFT_MSG_NEWCHAIN,
1900                                                       NLM_F_MULTI,
1901                                                       table->family, table,
1902                                                       chain, NULL) < 0)
1903                                 goto done;
1904
1905                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1906 cont:
1907                         idx++;
1908                 }
1909         }
1910 done:
1911         rcu_read_unlock();
1912         cb->args[0] = idx;
1913         return skb->len;
1914 }
1915
1916 /* called with rcu_read_lock held */
1917 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1918                               const struct nlattr * const nla[])
1919 {
1920         struct netlink_ext_ack *extack = info->extack;
1921         u8 genmask = nft_genmask_cur(info->net);
1922         u8 family = info->nfmsg->nfgen_family;
1923         const struct nft_chain *chain;
1924         struct net *net = info->net;
1925         struct nft_table *table;
1926         struct sk_buff *skb2;
1927         int err;
1928
1929         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1930                 struct netlink_dump_control c = {
1931                         .dump = nf_tables_dump_chains,
1932                         .module = THIS_MODULE,
1933                 };
1934
1935                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1936         }
1937
1938         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1939         if (IS_ERR(table)) {
1940                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1941                 return PTR_ERR(table);
1942         }
1943
1944         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1945         if (IS_ERR(chain)) {
1946                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1947                 return PTR_ERR(chain);
1948         }
1949
1950         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1951         if (!skb2)
1952                 return -ENOMEM;
1953
1954         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1955                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1956                                         0, family, table, chain, NULL);
1957         if (err < 0)
1958                 goto err_fill_chain_info;
1959
1960         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1961
1962 err_fill_chain_info:
1963         kfree_skb(skb2);
1964         return err;
1965 }
1966
1967 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1968         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1969         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1970 };
1971
1972 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1973 {
1974         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1975         struct nft_stats __percpu *newstats;
1976         struct nft_stats *stats;
1977         int err;
1978
1979         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1980                                           nft_counter_policy, NULL);
1981         if (err < 0)
1982                 return ERR_PTR(err);
1983
1984         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1985                 return ERR_PTR(-EINVAL);
1986
1987         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1988         if (newstats == NULL)
1989                 return ERR_PTR(-ENOMEM);
1990
1991         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1992          * are not exposed to userspace.
1993          */
1994         preempt_disable();
1995         stats = this_cpu_ptr(newstats);
1996         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1997         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1998         preempt_enable();
1999
2000         return newstats;
2001 }
2002
2003 static void nft_chain_stats_replace(struct nft_trans *trans)
2004 {
2005         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
2006
2007         if (!nft_trans_chain_stats(trans))
2008                 return;
2009
2010         nft_trans_chain_stats(trans) =
2011                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
2012                                     lockdep_commit_lock_is_held(trans->ctx.net));
2013
2014         if (!nft_trans_chain_stats(trans))
2015                 static_branch_inc(&nft_counters_enabled);
2016 }
2017
2018 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
2019 {
2020         struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
2021         struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
2022
2023         if (g0 != g1)
2024                 kvfree(g1);
2025         kvfree(g0);
2026
2027         /* should be NULL either via abort or via successful commit */
2028         WARN_ON_ONCE(chain->blob_next);
2029         kvfree(chain->blob_next);
2030 }
2031
2032 void nf_tables_chain_destroy(struct nft_ctx *ctx)
2033 {
2034         struct nft_chain *chain = ctx->chain;
2035         struct nft_hook *hook, *next;
2036
2037         if (WARN_ON(chain->use > 0))
2038                 return;
2039
2040         /* no concurrent access possible anymore */
2041         nf_tables_chain_free_chain_rules(chain);
2042
2043         if (nft_is_base_chain(chain)) {
2044                 struct nft_base_chain *basechain = nft_base_chain(chain);
2045
2046                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2047                         list_for_each_entry_safe(hook, next,
2048                                                  &basechain->hook_list, list) {
2049                                 list_del_rcu(&hook->list);
2050                                 kfree_rcu(hook, rcu);
2051                         }
2052                 }
2053                 module_put(basechain->type->owner);
2054                 if (rcu_access_pointer(basechain->stats)) {
2055                         static_branch_dec(&nft_counters_enabled);
2056                         free_percpu(rcu_dereference_raw(basechain->stats));
2057                 }
2058                 kfree(chain->name);
2059                 kfree(chain->udata);
2060                 kfree(basechain);
2061         } else {
2062                 kfree(chain->name);
2063                 kfree(chain->udata);
2064                 kfree(chain);
2065         }
2066 }
2067
2068 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2069                                               const struct nlattr *attr)
2070 {
2071         struct net_device *dev;
2072         char ifname[IFNAMSIZ];
2073         struct nft_hook *hook;
2074         int err;
2075
2076         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2077         if (!hook) {
2078                 err = -ENOMEM;
2079                 goto err_hook_alloc;
2080         }
2081
2082         nla_strscpy(ifname, attr, IFNAMSIZ);
2083         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2084          * indirectly serializing all the other holders of the commit_mutex with
2085          * the rtnl_mutex.
2086          */
2087         dev = __dev_get_by_name(net, ifname);
2088         if (!dev) {
2089                 err = -ENOENT;
2090                 goto err_hook_dev;
2091         }
2092         hook->ops.dev = dev;
2093
2094         return hook;
2095
2096 err_hook_dev:
2097         kfree(hook);
2098 err_hook_alloc:
2099         return ERR_PTR(err);
2100 }
2101
2102 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2103                                            const struct nft_hook *this)
2104 {
2105         struct nft_hook *hook;
2106
2107         list_for_each_entry(hook, hook_list, list) {
2108                 if (this->ops.dev == hook->ops.dev)
2109                         return hook;
2110         }
2111
2112         return NULL;
2113 }
2114
2115 static int nf_tables_parse_netdev_hooks(struct net *net,
2116                                         const struct nlattr *attr,
2117                                         struct list_head *hook_list,
2118                                         struct netlink_ext_ack *extack)
2119 {
2120         struct nft_hook *hook, *next;
2121         const struct nlattr *tmp;
2122         int rem, n = 0, err;
2123
2124         nla_for_each_nested(tmp, attr, rem) {
2125                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2126                         err = -EINVAL;
2127                         goto err_hook;
2128                 }
2129
2130                 hook = nft_netdev_hook_alloc(net, tmp);
2131                 if (IS_ERR(hook)) {
2132                         NL_SET_BAD_ATTR(extack, tmp);
2133                         err = PTR_ERR(hook);
2134                         goto err_hook;
2135                 }
2136                 if (nft_hook_list_find(hook_list, hook)) {
2137                         NL_SET_BAD_ATTR(extack, tmp);
2138                         kfree(hook);
2139                         err = -EEXIST;
2140                         goto err_hook;
2141                 }
2142                 list_add_tail(&hook->list, hook_list);
2143                 n++;
2144
2145                 if (n == NFT_NETDEVICE_MAX) {
2146                         err = -EFBIG;
2147                         goto err_hook;
2148                 }
2149         }
2150
2151         return 0;
2152
2153 err_hook:
2154         list_for_each_entry_safe(hook, next, hook_list, list) {
2155                 list_del(&hook->list);
2156                 kfree(hook);
2157         }
2158         return err;
2159 }
2160
2161 struct nft_chain_hook {
2162         u32                             num;
2163         s32                             priority;
2164         const struct nft_chain_type     *type;
2165         struct list_head                list;
2166 };
2167
2168 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2169                                   struct list_head *hook_list,
2170                                   struct netlink_ext_ack *extack, u32 flags)
2171 {
2172         struct nft_hook *hook;
2173         int err;
2174
2175         if (tb[NFTA_HOOK_DEV]) {
2176                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2177                 if (IS_ERR(hook)) {
2178                         NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2179                         return PTR_ERR(hook);
2180                 }
2181
2182                 list_add_tail(&hook->list, hook_list);
2183         } else if (tb[NFTA_HOOK_DEVS]) {
2184                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2185                                                    hook_list, extack);
2186                 if (err < 0)
2187                         return err;
2188
2189         }
2190
2191         if (flags & NFT_CHAIN_HW_OFFLOAD &&
2192             list_empty(hook_list))
2193                 return -EINVAL;
2194
2195         return 0;
2196 }
2197
2198 static int nft_chain_parse_hook(struct net *net,
2199                                 struct nft_base_chain *basechain,
2200                                 const struct nlattr * const nla[],
2201                                 struct nft_chain_hook *hook, u8 family,
2202                                 u32 flags, struct netlink_ext_ack *extack)
2203 {
2204         struct nftables_pernet *nft_net = nft_pernet(net);
2205         struct nlattr *ha[NFTA_HOOK_MAX + 1];
2206         const struct nft_chain_type *type;
2207         int err;
2208
2209         lockdep_assert_held(&nft_net->commit_mutex);
2210         lockdep_nfnl_nft_mutex_not_held();
2211
2212         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2213                                           nla[NFTA_CHAIN_HOOK],
2214                                           nft_hook_policy, NULL);
2215         if (err < 0)
2216                 return err;
2217
2218         if (!basechain) {
2219                 if (!ha[NFTA_HOOK_HOOKNUM] ||
2220                     !ha[NFTA_HOOK_PRIORITY]) {
2221                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2222                         return -ENOENT;
2223                 }
2224
2225                 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2226                 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2227
2228                 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2229                 if (!type)
2230                         return -EOPNOTSUPP;
2231
2232                 if (nla[NFTA_CHAIN_TYPE]) {
2233                         type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2234                                                            family, true);
2235                         if (IS_ERR(type)) {
2236                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2237                                 return PTR_ERR(type);
2238                         }
2239                 }
2240                 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2241                         return -EOPNOTSUPP;
2242
2243                 if (type->type == NFT_CHAIN_T_NAT &&
2244                     hook->priority <= NF_IP_PRI_CONNTRACK)
2245                         return -EOPNOTSUPP;
2246         } else {
2247                 if (ha[NFTA_HOOK_HOOKNUM]) {
2248                         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2249                         if (hook->num != basechain->ops.hooknum)
2250                                 return -EOPNOTSUPP;
2251                 }
2252                 if (ha[NFTA_HOOK_PRIORITY]) {
2253                         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2254                         if (hook->priority != basechain->ops.priority)
2255                                 return -EOPNOTSUPP;
2256                 }
2257
2258                 type = basechain->type;
2259         }
2260
2261         if (!try_module_get(type->owner)) {
2262                 if (nla[NFTA_CHAIN_TYPE])
2263                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2264                 return -ENOENT;
2265         }
2266
2267         hook->type = type;
2268
2269         INIT_LIST_HEAD(&hook->list);
2270         if (nft_base_chain_netdev(family, hook->num)) {
2271                 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2272                 if (err < 0) {
2273                         module_put(type->owner);
2274                         return err;
2275                 }
2276         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2277                 module_put(type->owner);
2278                 return -EOPNOTSUPP;
2279         }
2280
2281         return 0;
2282 }
2283
2284 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2285 {
2286         struct nft_hook *h, *next;
2287
2288         list_for_each_entry_safe(h, next, &hook->list, list) {
2289                 list_del(&h->list);
2290                 kfree(h);
2291         }
2292         module_put(hook->type->owner);
2293 }
2294
2295 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2296 {
2297         struct nft_rule_dp_last *lrule;
2298
2299         BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2300
2301         lrule = (struct nft_rule_dp_last *)ptr;
2302         lrule->end.is_last = 1;
2303         lrule->chain = chain;
2304         /* blob size does not include the trailer rule */
2305 }
2306
2307 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2308                                                          unsigned int size)
2309 {
2310         struct nft_rule_blob *blob;
2311
2312         if (size > INT_MAX)
2313                 return NULL;
2314
2315         size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2316
2317         blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2318         if (!blob)
2319                 return NULL;
2320
2321         blob->size = 0;
2322         nft_last_rule(chain, blob->data);
2323
2324         return blob;
2325 }
2326
2327 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2328                                     const struct nft_chain_hook *hook,
2329                                     struct nft_chain *chain)
2330 {
2331         ops->pf                 = family;
2332         ops->hooknum            = hook->num;
2333         ops->priority           = hook->priority;
2334         ops->priv               = chain;
2335         ops->hook               = hook->type->hooks[ops->hooknum];
2336         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2337 }
2338
2339 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2340                               struct nft_chain_hook *hook, u32 flags)
2341 {
2342         struct nft_chain *chain;
2343         struct nft_hook *h;
2344
2345         basechain->type = hook->type;
2346         INIT_LIST_HEAD(&basechain->hook_list);
2347         chain = &basechain->chain;
2348
2349         if (nft_base_chain_netdev(family, hook->num)) {
2350                 list_splice_init(&hook->list, &basechain->hook_list);
2351                 list_for_each_entry(h, &basechain->hook_list, list)
2352                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2353         }
2354         nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2355
2356         chain->flags |= NFT_CHAIN_BASE | flags;
2357         basechain->policy = NF_ACCEPT;
2358         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2359             !nft_chain_offload_support(basechain)) {
2360                 list_splice_init(&basechain->hook_list, &hook->list);
2361                 return -EOPNOTSUPP;
2362         }
2363
2364         flow_block_init(&basechain->flow_block);
2365
2366         return 0;
2367 }
2368
2369 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2370 {
2371         int err;
2372
2373         err = rhltable_insert_key(&table->chains_ht, chain->name,
2374                                   &chain->rhlhead, nft_chain_ht_params);
2375         if (err)
2376                 return err;
2377
2378         list_add_tail_rcu(&chain->list, &table->chains);
2379
2380         return 0;
2381 }
2382
2383 static u64 chain_id;
2384
2385 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2386                               u8 policy, u32 flags,
2387                               struct netlink_ext_ack *extack)
2388 {
2389         const struct nlattr * const *nla = ctx->nla;
2390         struct nft_table *table = ctx->table;
2391         struct nft_base_chain *basechain;
2392         struct net *net = ctx->net;
2393         char name[NFT_NAME_MAXLEN];
2394         struct nft_rule_blob *blob;
2395         struct nft_trans *trans;
2396         struct nft_chain *chain;
2397         int err;
2398
2399         if (table->use == UINT_MAX)
2400                 return -EOVERFLOW;
2401
2402         if (nla[NFTA_CHAIN_HOOK]) {
2403                 struct nft_stats __percpu *stats = NULL;
2404                 struct nft_chain_hook hook = {};
2405
2406                 if (flags & NFT_CHAIN_BINDING)
2407                         return -EOPNOTSUPP;
2408
2409                 err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2410                                            extack);
2411                 if (err < 0)
2412                         return err;
2413
2414                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2415                 if (basechain == NULL) {
2416                         nft_chain_release_hook(&hook);
2417                         return -ENOMEM;
2418                 }
2419                 chain = &basechain->chain;
2420
2421                 if (nla[NFTA_CHAIN_COUNTERS]) {
2422                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2423                         if (IS_ERR(stats)) {
2424                                 nft_chain_release_hook(&hook);
2425                                 kfree(basechain);
2426                                 return PTR_ERR(stats);
2427                         }
2428                         rcu_assign_pointer(basechain->stats, stats);
2429                 }
2430
2431                 err = nft_basechain_init(basechain, family, &hook, flags);
2432                 if (err < 0) {
2433                         nft_chain_release_hook(&hook);
2434                         kfree(basechain);
2435                         free_percpu(stats);
2436                         return err;
2437                 }
2438                 if (stats)
2439                         static_branch_inc(&nft_counters_enabled);
2440         } else {
2441                 if (flags & NFT_CHAIN_BASE)
2442                         return -EINVAL;
2443                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2444                         return -EOPNOTSUPP;
2445
2446                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2447                 if (chain == NULL)
2448                         return -ENOMEM;
2449
2450                 chain->flags = flags;
2451         }
2452         ctx->chain = chain;
2453
2454         INIT_LIST_HEAD(&chain->rules);
2455         chain->handle = nf_tables_alloc_handle(table);
2456         chain->table = table;
2457
2458         if (nla[NFTA_CHAIN_NAME]) {
2459                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2460         } else {
2461                 if (!(flags & NFT_CHAIN_BINDING)) {
2462                         err = -EINVAL;
2463                         goto err_destroy_chain;
2464                 }
2465
2466                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2467                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2468         }
2469
2470         if (!chain->name) {
2471                 err = -ENOMEM;
2472                 goto err_destroy_chain;
2473         }
2474
2475         if (nla[NFTA_CHAIN_USERDATA]) {
2476                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2477                 if (chain->udata == NULL) {
2478                         err = -ENOMEM;
2479                         goto err_destroy_chain;
2480                 }
2481                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2482         }
2483
2484         blob = nf_tables_chain_alloc_rules(chain, 0);
2485         if (!blob) {
2486                 err = -ENOMEM;
2487                 goto err_destroy_chain;
2488         }
2489
2490         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2491         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2492
2493         err = nf_tables_register_hook(net, table, chain);
2494         if (err < 0)
2495                 goto err_destroy_chain;
2496
2497         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2498         if (IS_ERR(trans)) {
2499                 err = PTR_ERR(trans);
2500                 goto err_unregister_hook;
2501         }
2502
2503         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2504         if (nft_is_base_chain(chain))
2505                 nft_trans_chain_policy(trans) = policy;
2506
2507         err = nft_chain_add(table, chain);
2508         if (err < 0) {
2509                 nft_trans_destroy(trans);
2510                 goto err_unregister_hook;
2511         }
2512
2513         table->use++;
2514
2515         return 0;
2516 err_unregister_hook:
2517         nf_tables_unregister_hook(net, table, chain);
2518 err_destroy_chain:
2519         nf_tables_chain_destroy(ctx);
2520
2521         return err;
2522 }
2523
2524 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2525                               u32 flags, const struct nlattr *attr,
2526                               struct netlink_ext_ack *extack)
2527 {
2528         const struct nlattr * const *nla = ctx->nla;
2529         struct nft_base_chain *basechain = NULL;
2530         struct nft_table *table = ctx->table;
2531         struct nft_chain *chain = ctx->chain;
2532         struct nft_chain_hook hook = {};
2533         struct nft_stats *stats = NULL;
2534         struct nft_hook *h, *next;
2535         struct nf_hook_ops *ops;
2536         struct nft_trans *trans;
2537         bool unregister = false;
2538         int err;
2539
2540         if (chain->flags ^ flags)
2541                 return -EOPNOTSUPP;
2542
2543         INIT_LIST_HEAD(&hook.list);
2544
2545         if (nla[NFTA_CHAIN_HOOK]) {
2546                 if (!nft_is_base_chain(chain)) {
2547                         NL_SET_BAD_ATTR(extack, attr);
2548                         return -EEXIST;
2549                 }
2550
2551                 basechain = nft_base_chain(chain);
2552                 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2553                                            ctx->family, flags, extack);
2554                 if (err < 0)
2555                         return err;
2556
2557                 if (basechain->type != hook.type) {
2558                         nft_chain_release_hook(&hook);
2559                         NL_SET_BAD_ATTR(extack, attr);
2560                         return -EEXIST;
2561                 }
2562
2563                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2564                         list_for_each_entry_safe(h, next, &hook.list, list) {
2565                                 h->ops.pf       = basechain->ops.pf;
2566                                 h->ops.hooknum  = basechain->ops.hooknum;
2567                                 h->ops.priority = basechain->ops.priority;
2568                                 h->ops.priv     = basechain->ops.priv;
2569                                 h->ops.hook     = basechain->ops.hook;
2570
2571                                 if (nft_hook_list_find(&basechain->hook_list, h)) {
2572                                         list_del(&h->list);
2573                                         kfree(h);
2574                                 }
2575                         }
2576                 } else {
2577                         ops = &basechain->ops;
2578                         if (ops->hooknum != hook.num ||
2579                             ops->priority != hook.priority) {
2580                                 nft_chain_release_hook(&hook);
2581                                 NL_SET_BAD_ATTR(extack, attr);
2582                                 return -EEXIST;
2583                         }
2584                 }
2585         }
2586
2587         if (nla[NFTA_CHAIN_HANDLE] &&
2588             nla[NFTA_CHAIN_NAME]) {
2589                 struct nft_chain *chain2;
2590
2591                 chain2 = nft_chain_lookup(ctx->net, table,
2592                                           nla[NFTA_CHAIN_NAME], genmask);
2593                 if (!IS_ERR(chain2)) {
2594                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2595                         err = -EEXIST;
2596                         goto err_hooks;
2597                 }
2598         }
2599
2600         if (nla[NFTA_CHAIN_COUNTERS]) {
2601                 if (!nft_is_base_chain(chain)) {
2602                         err = -EOPNOTSUPP;
2603                         goto err_hooks;
2604                 }
2605
2606                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2607                 if (IS_ERR(stats)) {
2608                         err = PTR_ERR(stats);
2609                         goto err_hooks;
2610                 }
2611         }
2612
2613         if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2614             nft_is_base_chain(chain) &&
2615             !list_empty(&hook.list)) {
2616                 basechain = nft_base_chain(chain);
2617                 ops = &basechain->ops;
2618
2619                 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2620                         err = nft_netdev_register_hooks(ctx->net, &hook.list);
2621                         if (err < 0)
2622                                 goto err_hooks;
2623                 }
2624         }
2625
2626         unregister = true;
2627         err = -ENOMEM;
2628         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2629                                 sizeof(struct nft_trans_chain));
2630         if (trans == NULL)
2631                 goto err_trans;
2632
2633         nft_trans_chain_stats(trans) = stats;
2634         nft_trans_chain_update(trans) = true;
2635
2636         if (nla[NFTA_CHAIN_POLICY])
2637                 nft_trans_chain_policy(trans) = policy;
2638         else
2639                 nft_trans_chain_policy(trans) = -1;
2640
2641         if (nla[NFTA_CHAIN_HANDLE] &&
2642             nla[NFTA_CHAIN_NAME]) {
2643                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2644                 struct nft_trans *tmp;
2645                 char *name;
2646
2647                 err = -ENOMEM;
2648                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2649                 if (!name)
2650                         goto err_trans;
2651
2652                 err = -EEXIST;
2653                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2654                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2655                             tmp->ctx.table == table &&
2656                             nft_trans_chain_update(tmp) &&
2657                             nft_trans_chain_name(tmp) &&
2658                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2659                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2660                                 kfree(name);
2661                                 goto err_trans;
2662                         }
2663                 }
2664
2665                 nft_trans_chain_name(trans) = name;
2666         }
2667
2668         nft_trans_basechain(trans) = basechain;
2669         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2670         list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2671         if (nla[NFTA_CHAIN_HOOK])
2672                 module_put(hook.type->owner);
2673
2674         nft_trans_commit_list_add_tail(ctx->net, trans);
2675
2676         return 0;
2677
2678 err_trans:
2679         free_percpu(stats);
2680         kfree(trans);
2681 err_hooks:
2682         if (nla[NFTA_CHAIN_HOOK]) {
2683                 list_for_each_entry_safe(h, next, &hook.list, list) {
2684                         if (unregister)
2685                                 nf_unregister_net_hook(ctx->net, &h->ops);
2686                         list_del(&h->list);
2687                         kfree_rcu(h, rcu);
2688                 }
2689                 module_put(hook.type->owner);
2690         }
2691
2692         return err;
2693 }
2694
2695 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2696                                                const struct nft_table *table,
2697                                                const struct nlattr *nla)
2698 {
2699         struct nftables_pernet *nft_net = nft_pernet(net);
2700         u32 id = ntohl(nla_get_be32(nla));
2701         struct nft_trans *trans;
2702
2703         list_for_each_entry(trans, &nft_net->commit_list, list) {
2704                 struct nft_chain *chain = trans->ctx.chain;
2705
2706                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2707                     chain->table == table &&
2708                     id == nft_trans_chain_id(trans))
2709                         return chain;
2710         }
2711         return ERR_PTR(-ENOENT);
2712 }
2713
2714 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2715                               const struct nlattr * const nla[])
2716 {
2717         struct nftables_pernet *nft_net = nft_pernet(info->net);
2718         struct netlink_ext_ack *extack = info->extack;
2719         u8 genmask = nft_genmask_next(info->net);
2720         u8 family = info->nfmsg->nfgen_family;
2721         struct nft_chain *chain = NULL;
2722         struct net *net = info->net;
2723         const struct nlattr *attr;
2724         struct nft_table *table;
2725         u8 policy = NF_ACCEPT;
2726         struct nft_ctx ctx;
2727         u64 handle = 0;
2728         u32 flags = 0;
2729
2730         lockdep_assert_held(&nft_net->commit_mutex);
2731
2732         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2733                                  NETLINK_CB(skb).portid);
2734         if (IS_ERR(table)) {
2735                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2736                 return PTR_ERR(table);
2737         }
2738
2739         chain = NULL;
2740         attr = nla[NFTA_CHAIN_NAME];
2741
2742         if (nla[NFTA_CHAIN_HANDLE]) {
2743                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2744                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2745                 if (IS_ERR(chain)) {
2746                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2747                         return PTR_ERR(chain);
2748                 }
2749                 attr = nla[NFTA_CHAIN_HANDLE];
2750         } else if (nla[NFTA_CHAIN_NAME]) {
2751                 chain = nft_chain_lookup(net, table, attr, genmask);
2752                 if (IS_ERR(chain)) {
2753                         if (PTR_ERR(chain) != -ENOENT) {
2754                                 NL_SET_BAD_ATTR(extack, attr);
2755                                 return PTR_ERR(chain);
2756                         }
2757                         chain = NULL;
2758                 }
2759         } else if (!nla[NFTA_CHAIN_ID]) {
2760                 return -EINVAL;
2761         }
2762
2763         if (nla[NFTA_CHAIN_POLICY]) {
2764                 if (chain != NULL &&
2765                     !nft_is_base_chain(chain)) {
2766                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2767                         return -EOPNOTSUPP;
2768                 }
2769
2770                 if (chain == NULL &&
2771                     nla[NFTA_CHAIN_HOOK] == NULL) {
2772                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2773                         return -EOPNOTSUPP;
2774                 }
2775
2776                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2777                 switch (policy) {
2778                 case NF_DROP:
2779                 case NF_ACCEPT:
2780                         break;
2781                 default:
2782                         return -EINVAL;
2783                 }
2784         }
2785
2786         if (nla[NFTA_CHAIN_FLAGS])
2787                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2788         else if (chain)
2789                 flags = chain->flags;
2790
2791         if (flags & ~NFT_CHAIN_FLAGS)
2792                 return -EOPNOTSUPP;
2793
2794         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2795
2796         if (chain != NULL) {
2797                 if (chain->flags & NFT_CHAIN_BINDING)
2798                         return -EINVAL;
2799
2800                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2801                         NL_SET_BAD_ATTR(extack, attr);
2802                         return -EEXIST;
2803                 }
2804                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2805                         return -EOPNOTSUPP;
2806
2807                 flags |= chain->flags & NFT_CHAIN_BASE;
2808                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2809                                           extack);
2810         }
2811
2812         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2813 }
2814
2815 static int nft_delchain_hook(struct nft_ctx *ctx,
2816                              struct nft_base_chain *basechain,
2817                              struct netlink_ext_ack *extack)
2818 {
2819         const struct nft_chain *chain = &basechain->chain;
2820         const struct nlattr * const *nla = ctx->nla;
2821         struct nft_chain_hook chain_hook = {};
2822         struct nft_hook *this, *hook;
2823         LIST_HEAD(chain_del_list);
2824         struct nft_trans *trans;
2825         int err;
2826
2827         err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2828                                    ctx->family, chain->flags, extack);
2829         if (err < 0)
2830                 return err;
2831
2832         list_for_each_entry(this, &chain_hook.list, list) {
2833                 hook = nft_hook_list_find(&basechain->hook_list, this);
2834                 if (!hook) {
2835                         err = -ENOENT;
2836                         goto err_chain_del_hook;
2837                 }
2838                 list_move(&hook->list, &chain_del_list);
2839         }
2840
2841         trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2842                                 sizeof(struct nft_trans_chain));
2843         if (!trans) {
2844                 err = -ENOMEM;
2845                 goto err_chain_del_hook;
2846         }
2847
2848         nft_trans_basechain(trans) = basechain;
2849         nft_trans_chain_update(trans) = true;
2850         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2851         list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2852         nft_chain_release_hook(&chain_hook);
2853
2854         nft_trans_commit_list_add_tail(ctx->net, trans);
2855
2856         return 0;
2857
2858 err_chain_del_hook:
2859         list_splice(&chain_del_list, &basechain->hook_list);
2860         nft_chain_release_hook(&chain_hook);
2861
2862         return err;
2863 }
2864
2865 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2866                               const struct nlattr * const nla[])
2867 {
2868         struct netlink_ext_ack *extack = info->extack;
2869         u8 genmask = nft_genmask_next(info->net);
2870         u8 family = info->nfmsg->nfgen_family;
2871         struct net *net = info->net;
2872         const struct nlattr *attr;
2873         struct nft_table *table;
2874         struct nft_chain *chain;
2875         struct nft_rule *rule;
2876         struct nft_ctx ctx;
2877         u64 handle;
2878         u32 use;
2879         int err;
2880
2881         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2882                                  NETLINK_CB(skb).portid);
2883         if (IS_ERR(table)) {
2884                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2885                 return PTR_ERR(table);
2886         }
2887
2888         if (nla[NFTA_CHAIN_HANDLE]) {
2889                 attr = nla[NFTA_CHAIN_HANDLE];
2890                 handle = be64_to_cpu(nla_get_be64(attr));
2891                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2892         } else {
2893                 attr = nla[NFTA_CHAIN_NAME];
2894                 chain = nft_chain_lookup(net, table, attr, genmask);
2895         }
2896         if (IS_ERR(chain)) {
2897                 if (PTR_ERR(chain) == -ENOENT &&
2898                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2899                         return 0;
2900
2901                 NL_SET_BAD_ATTR(extack, attr);
2902                 return PTR_ERR(chain);
2903         }
2904
2905         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2906
2907         if (nla[NFTA_CHAIN_HOOK]) {
2908                 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2909                         return -EOPNOTSUPP;
2910
2911                 if (nft_is_base_chain(chain)) {
2912                         struct nft_base_chain *basechain = nft_base_chain(chain);
2913
2914                         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2915                                 return nft_delchain_hook(&ctx, basechain, extack);
2916                 }
2917         }
2918
2919         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2920             chain->use > 0)
2921                 return -EBUSY;
2922
2923         use = chain->use;
2924         list_for_each_entry(rule, &chain->rules, list) {
2925                 if (!nft_is_active_next(net, rule))
2926                         continue;
2927                 use--;
2928
2929                 err = nft_delrule(&ctx, rule);
2930                 if (err < 0)
2931                         return err;
2932         }
2933
2934         /* There are rules and elements that are still holding references to us,
2935          * we cannot do a recursive removal in this case.
2936          */
2937         if (use > 0) {
2938                 NL_SET_BAD_ATTR(extack, attr);
2939                 return -EBUSY;
2940         }
2941
2942         return nft_delchain(&ctx);
2943 }
2944
2945 /*
2946  * Expressions
2947  */
2948
2949 /**
2950  *      nft_register_expr - register nf_tables expr type
2951  *      @type: expr type
2952  *
2953  *      Registers the expr type for use with nf_tables. Returns zero on
2954  *      success or a negative errno code otherwise.
2955  */
2956 int nft_register_expr(struct nft_expr_type *type)
2957 {
2958         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2959         if (type->family == NFPROTO_UNSPEC)
2960                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2961         else
2962                 list_add_rcu(&type->list, &nf_tables_expressions);
2963         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2964         return 0;
2965 }
2966 EXPORT_SYMBOL_GPL(nft_register_expr);
2967
2968 /**
2969  *      nft_unregister_expr - unregister nf_tables expr type
2970  *      @type: expr type
2971  *
2972  *      Unregisters the expr typefor use with nf_tables.
2973  */
2974 void nft_unregister_expr(struct nft_expr_type *type)
2975 {
2976         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2977         list_del_rcu(&type->list);
2978         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2979 }
2980 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2981
2982 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2983                                                        struct nlattr *nla)
2984 {
2985         const struct nft_expr_type *type, *candidate = NULL;
2986
2987         list_for_each_entry(type, &nf_tables_expressions, list) {
2988                 if (!nla_strcmp(nla, type->name)) {
2989                         if (!type->family && !candidate)
2990                                 candidate = type;
2991                         else if (type->family == family)
2992                                 candidate = type;
2993                 }
2994         }
2995         return candidate;
2996 }
2997
2998 #ifdef CONFIG_MODULES
2999 static int nft_expr_type_request_module(struct net *net, u8 family,
3000                                         struct nlattr *nla)
3001 {
3002         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3003                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3004                 return -EAGAIN;
3005
3006         return 0;
3007 }
3008 #endif
3009
3010 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3011                                                      u8 family,
3012                                                      struct nlattr *nla)
3013 {
3014         const struct nft_expr_type *type;
3015
3016         if (nla == NULL)
3017                 return ERR_PTR(-EINVAL);
3018
3019         type = __nft_expr_type_get(family, nla);
3020         if (type != NULL && try_module_get(type->owner))
3021                 return type;
3022
3023         lockdep_nfnl_nft_mutex_not_held();
3024 #ifdef CONFIG_MODULES
3025         if (type == NULL) {
3026                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3027                         return ERR_PTR(-EAGAIN);
3028
3029                 if (nft_request_module(net, "nft-expr-%.*s",
3030                                        nla_len(nla),
3031                                        (char *)nla_data(nla)) == -EAGAIN)
3032                         return ERR_PTR(-EAGAIN);
3033         }
3034 #endif
3035         return ERR_PTR(-ENOENT);
3036 }
3037
3038 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3039         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
3040                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
3041         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
3042 };
3043
3044 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3045                                     const struct nft_expr *expr, bool reset)
3046 {
3047         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3048                 goto nla_put_failure;
3049
3050         if (expr->ops->dump) {
3051                 struct nlattr *data = nla_nest_start_noflag(skb,
3052                                                             NFTA_EXPR_DATA);
3053                 if (data == NULL)
3054                         goto nla_put_failure;
3055                 if (expr->ops->dump(skb, expr, reset) < 0)
3056                         goto nla_put_failure;
3057                 nla_nest_end(skb, data);
3058         }
3059
3060         return skb->len;
3061
3062 nla_put_failure:
3063         return -1;
3064 };
3065
3066 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3067                   const struct nft_expr *expr, bool reset)
3068 {
3069         struct nlattr *nest;
3070
3071         nest = nla_nest_start_noflag(skb, attr);
3072         if (!nest)
3073                 goto nla_put_failure;
3074         if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3075                 goto nla_put_failure;
3076         nla_nest_end(skb, nest);
3077         return 0;
3078
3079 nla_put_failure:
3080         return -1;
3081 }
3082
3083 struct nft_expr_info {
3084         const struct nft_expr_ops       *ops;
3085         const struct nlattr             *attr;
3086         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
3087 };
3088
3089 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3090                                 const struct nlattr *nla,
3091                                 struct nft_expr_info *info)
3092 {
3093         const struct nft_expr_type *type;
3094         const struct nft_expr_ops *ops;
3095         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3096         int err;
3097
3098         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3099                                           nft_expr_policy, NULL);
3100         if (err < 0)
3101                 return err;
3102
3103         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3104         if (IS_ERR(type))
3105                 return PTR_ERR(type);
3106
3107         if (tb[NFTA_EXPR_DATA]) {
3108                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3109                                                   tb[NFTA_EXPR_DATA],
3110                                                   type->policy, NULL);
3111                 if (err < 0)
3112                         goto err1;
3113         } else
3114                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3115
3116         if (type->select_ops != NULL) {
3117                 ops = type->select_ops(ctx,
3118                                        (const struct nlattr * const *)info->tb);
3119                 if (IS_ERR(ops)) {
3120                         err = PTR_ERR(ops);
3121 #ifdef CONFIG_MODULES
3122                         if (err == -EAGAIN)
3123                                 if (nft_expr_type_request_module(ctx->net,
3124                                                                  ctx->family,
3125                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
3126                                         err = -ENOENT;
3127 #endif
3128                         goto err1;
3129                 }
3130         } else
3131                 ops = type->ops;
3132
3133         info->attr = nla;
3134         info->ops = ops;
3135
3136         return 0;
3137
3138 err1:
3139         module_put(type->owner);
3140         return err;
3141 }
3142
3143 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3144                          struct nft_expr_info *info)
3145 {
3146         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3147         const struct nft_expr_type *type;
3148         int err;
3149
3150         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3151                                           nft_expr_policy, NULL);
3152         if (err < 0)
3153                 return err;
3154
3155         if (!tb[NFTA_EXPR_DATA])
3156                 return -EINVAL;
3157
3158         type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3159         if (!type)
3160                 return -ENOENT;
3161
3162         if (!type->inner_ops)
3163                 return -EOPNOTSUPP;
3164
3165         err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3166                                           tb[NFTA_EXPR_DATA],
3167                                           type->policy, NULL);
3168         if (err < 0)
3169                 goto err_nla_parse;
3170
3171         info->attr = nla;
3172         info->ops = type->inner_ops;
3173
3174         return 0;
3175
3176 err_nla_parse:
3177         return err;
3178 }
3179
3180 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3181                              const struct nft_expr_info *expr_info,
3182                              struct nft_expr *expr)
3183 {
3184         const struct nft_expr_ops *ops = expr_info->ops;
3185         int err;
3186
3187         expr->ops = ops;
3188         if (ops->init) {
3189                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3190                 if (err < 0)
3191                         goto err1;
3192         }
3193
3194         return 0;
3195 err1:
3196         expr->ops = NULL;
3197         return err;
3198 }
3199
3200 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3201                                    struct nft_expr *expr)
3202 {
3203         const struct nft_expr_type *type = expr->ops->type;
3204
3205         if (expr->ops->destroy)
3206                 expr->ops->destroy(ctx, expr);
3207         module_put(type->owner);
3208 }
3209
3210 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3211                                       const struct nlattr *nla)
3212 {
3213         struct nft_expr_info expr_info;
3214         struct nft_expr *expr;
3215         struct module *owner;
3216         int err;
3217
3218         err = nf_tables_expr_parse(ctx, nla, &expr_info);
3219         if (err < 0)
3220                 goto err_expr_parse;
3221
3222         err = -EOPNOTSUPP;
3223         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3224                 goto err_expr_stateful;
3225
3226         err = -ENOMEM;
3227         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3228         if (expr == NULL)
3229                 goto err_expr_stateful;
3230
3231         err = nf_tables_newexpr(ctx, &expr_info, expr);
3232         if (err < 0)
3233                 goto err_expr_new;
3234
3235         return expr;
3236 err_expr_new:
3237         kfree(expr);
3238 err_expr_stateful:
3239         owner = expr_info.ops->type->owner;
3240         if (expr_info.ops->type->release_ops)
3241                 expr_info.ops->type->release_ops(expr_info.ops);
3242
3243         module_put(owner);
3244 err_expr_parse:
3245         return ERR_PTR(err);
3246 }
3247
3248 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3249 {
3250         int err;
3251
3252         if (src->ops->clone) {
3253                 dst->ops = src->ops;
3254                 err = src->ops->clone(dst, src);
3255                 if (err < 0)
3256                         return err;
3257         } else {
3258                 memcpy(dst, src, src->ops->size);
3259         }
3260
3261         __module_get(src->ops->type->owner);
3262
3263         return 0;
3264 }
3265
3266 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3267 {
3268         nf_tables_expr_destroy(ctx, expr);
3269         kfree(expr);
3270 }
3271
3272 /*
3273  * Rules
3274  */
3275
3276 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3277                                           u64 handle)
3278 {
3279         struct nft_rule *rule;
3280
3281         // FIXME: this sucks
3282         list_for_each_entry_rcu(rule, &chain->rules, list) {
3283                 if (handle == rule->handle)
3284                         return rule;
3285         }
3286
3287         return ERR_PTR(-ENOENT);
3288 }
3289
3290 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3291                                         const struct nlattr *nla)
3292 {
3293         if (nla == NULL)
3294                 return ERR_PTR(-EINVAL);
3295
3296         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3297 }
3298
3299 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3300         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
3301                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
3302         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
3303                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
3304         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
3305         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3306         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
3307         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
3308         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
3309                                     .len = NFT_USERDATA_MAXLEN },
3310         [NFTA_RULE_ID]          = { .type = NLA_U32 },
3311         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3312         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
3313 };
3314
3315 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3316                                     u32 portid, u32 seq, int event,
3317                                     u32 flags, int family,
3318                                     const struct nft_table *table,
3319                                     const struct nft_chain *chain,
3320                                     const struct nft_rule *rule, u64 handle,
3321                                     bool reset)
3322 {
3323         struct nlmsghdr *nlh;
3324         const struct nft_expr *expr, *next;
3325         struct nlattr *list;
3326         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3327
3328         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3329                            nft_base_seq(net));
3330         if (!nlh)
3331                 goto nla_put_failure;
3332
3333         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3334                 goto nla_put_failure;
3335         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3336                 goto nla_put_failure;
3337         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3338                          NFTA_RULE_PAD))
3339                 goto nla_put_failure;
3340
3341         if (event != NFT_MSG_DELRULE && handle) {
3342                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3343                                  NFTA_RULE_PAD))
3344                         goto nla_put_failure;
3345         }
3346
3347         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3348                 nft_flow_rule_stats(chain, rule);
3349
3350         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3351         if (list == NULL)
3352                 goto nla_put_failure;
3353         nft_rule_for_each_expr(expr, next, rule) {
3354                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3355                         goto nla_put_failure;
3356         }
3357         nla_nest_end(skb, list);
3358
3359         if (rule->udata) {
3360                 struct nft_userdata *udata = nft_userdata(rule);
3361                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3362                             udata->data) < 0)
3363                         goto nla_put_failure;
3364         }
3365
3366         nlmsg_end(skb, nlh);
3367         return 0;
3368
3369 nla_put_failure:
3370         nlmsg_trim(skb, nlh);
3371         return -1;
3372 }
3373
3374 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3375                                   const struct nft_rule *rule, int event)
3376 {
3377         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3378         const struct nft_rule *prule;
3379         struct sk_buff *skb;
3380         u64 handle = 0;
3381         u16 flags = 0;
3382         int err;
3383
3384         if (!ctx->report &&
3385             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3386                 return;
3387
3388         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3389         if (skb == NULL)
3390                 goto err;
3391
3392         if (event == NFT_MSG_NEWRULE &&
3393             !list_is_first(&rule->list, &ctx->chain->rules) &&
3394             !list_is_last(&rule->list, &ctx->chain->rules)) {
3395                 prule = list_prev_entry(rule, list);
3396                 handle = prule->handle;
3397         }
3398         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3399                 flags |= NLM_F_APPEND;
3400         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3401                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3402
3403         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3404                                        event, flags, ctx->family, ctx->table,
3405                                        ctx->chain, rule, handle, false);
3406         if (err < 0) {
3407                 kfree_skb(skb);
3408                 goto err;
3409         }
3410
3411         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3412         return;
3413 err:
3414         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3415 }
3416
3417 struct nft_rule_dump_ctx {
3418         char *table;
3419         char *chain;
3420 };
3421
3422 static int __nf_tables_dump_rules(struct sk_buff *skb,
3423                                   unsigned int *idx,
3424                                   struct netlink_callback *cb,
3425                                   const struct nft_table *table,
3426                                   const struct nft_chain *chain,
3427                                   bool reset)
3428 {
3429         struct net *net = sock_net(skb->sk);
3430         const struct nft_rule *rule, *prule;
3431         unsigned int s_idx = cb->args[0];
3432         u64 handle;
3433
3434         prule = NULL;
3435         list_for_each_entry_rcu(rule, &chain->rules, list) {
3436                 if (!nft_is_active(net, rule))
3437                         goto cont_skip;
3438                 if (*idx < s_idx)
3439                         goto cont;
3440                 if (*idx > s_idx) {
3441                         memset(&cb->args[1], 0,
3442                                         sizeof(cb->args) - sizeof(cb->args[0]));
3443                 }
3444                 if (prule)
3445                         handle = prule->handle;
3446                 else
3447                         handle = 0;
3448
3449                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3450                                         cb->nlh->nlmsg_seq,
3451                                         NFT_MSG_NEWRULE,
3452                                         NLM_F_MULTI | NLM_F_APPEND,
3453                                         table->family,
3454                                         table, chain, rule, handle, reset) < 0)
3455                         return 1;
3456
3457                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3458 cont:
3459                 prule = rule;
3460 cont_skip:
3461                 (*idx)++;
3462         }
3463         return 0;
3464 }
3465
3466 static int nf_tables_dump_rules(struct sk_buff *skb,
3467                                 struct netlink_callback *cb)
3468 {
3469         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3470         const struct nft_rule_dump_ctx *ctx = cb->data;
3471         struct nft_table *table;
3472         const struct nft_chain *chain;
3473         unsigned int idx = 0;
3474         struct net *net = sock_net(skb->sk);
3475         int family = nfmsg->nfgen_family;
3476         struct nftables_pernet *nft_net;
3477         bool reset = false;
3478
3479         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3480                 reset = true;
3481
3482         rcu_read_lock();
3483         nft_net = nft_pernet(net);
3484         cb->seq = READ_ONCE(nft_net->base_seq);
3485
3486         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3487                 if (family != NFPROTO_UNSPEC && family != table->family)
3488                         continue;
3489
3490                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3491                         continue;
3492
3493                 if (ctx && ctx->table && ctx->chain) {
3494                         struct rhlist_head *list, *tmp;
3495
3496                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3497                                                nft_chain_ht_params);
3498                         if (!list)
3499                                 goto done;
3500
3501                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3502                                 if (!nft_is_active(net, chain))
3503                                         continue;
3504                                 __nf_tables_dump_rules(skb, &idx,
3505                                                        cb, table, chain, reset);
3506                                 break;
3507                         }
3508                         goto done;
3509                 }
3510
3511                 list_for_each_entry_rcu(chain, &table->chains, list) {
3512                         if (__nf_tables_dump_rules(skb, &idx,
3513                                                    cb, table, chain, reset))
3514                                 goto done;
3515                 }
3516
3517                 if (ctx && ctx->table)
3518                         break;
3519         }
3520 done:
3521         rcu_read_unlock();
3522
3523         cb->args[0] = idx;
3524         return skb->len;
3525 }
3526
3527 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3528 {
3529         const struct nlattr * const *nla = cb->data;
3530         struct nft_rule_dump_ctx *ctx = NULL;
3531
3532         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3533                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3534                 if (!ctx)
3535                         return -ENOMEM;
3536
3537                 if (nla[NFTA_RULE_TABLE]) {
3538                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3539                                                         GFP_ATOMIC);
3540                         if (!ctx->table) {
3541                                 kfree(ctx);
3542                                 return -ENOMEM;
3543                         }
3544                 }
3545                 if (nla[NFTA_RULE_CHAIN]) {
3546                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3547                                                 GFP_ATOMIC);
3548                         if (!ctx->chain) {
3549                                 kfree(ctx->table);
3550                                 kfree(ctx);
3551                                 return -ENOMEM;
3552                         }
3553                 }
3554         }
3555
3556         cb->data = ctx;
3557         return 0;
3558 }
3559
3560 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3561 {
3562         struct nft_rule_dump_ctx *ctx = cb->data;
3563
3564         if (ctx) {
3565                 kfree(ctx->table);
3566                 kfree(ctx->chain);
3567                 kfree(ctx);
3568         }
3569         return 0;
3570 }
3571
3572 /* called with rcu_read_lock held */
3573 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3574                              const struct nlattr * const nla[])
3575 {
3576         struct netlink_ext_ack *extack = info->extack;
3577         u8 genmask = nft_genmask_cur(info->net);
3578         u8 family = info->nfmsg->nfgen_family;
3579         const struct nft_chain *chain;
3580         const struct nft_rule *rule;
3581         struct net *net = info->net;
3582         struct nft_table *table;
3583         struct sk_buff *skb2;
3584         bool reset = false;
3585         int err;
3586
3587         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3588                 struct netlink_dump_control c = {
3589                         .start= nf_tables_dump_rules_start,
3590                         .dump = nf_tables_dump_rules,
3591                         .done = nf_tables_dump_rules_done,
3592                         .module = THIS_MODULE,
3593                         .data = (void *)nla,
3594                 };
3595
3596                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3597         }
3598
3599         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3600         if (IS_ERR(table)) {
3601                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3602                 return PTR_ERR(table);
3603         }
3604
3605         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3606         if (IS_ERR(chain)) {
3607                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3608                 return PTR_ERR(chain);
3609         }
3610
3611         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3612         if (IS_ERR(rule)) {
3613                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3614                 return PTR_ERR(rule);
3615         }
3616
3617         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3618         if (!skb2)
3619                 return -ENOMEM;
3620
3621         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3622                 reset = true;
3623
3624         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3625                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3626                                        family, table, chain, rule, 0, reset);
3627         if (err < 0)
3628                 goto err_fill_rule_info;
3629
3630         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3631
3632 err_fill_rule_info:
3633         kfree_skb(skb2);
3634         return err;
3635 }
3636
3637 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3638 {
3639         struct nft_expr *expr, *next;
3640
3641         /*
3642          * Careful: some expressions might not be initialized in case this
3643          * is called on error from nf_tables_newrule().
3644          */
3645         expr = nft_expr_first(rule);
3646         while (nft_expr_more(rule, expr)) {
3647                 next = nft_expr_next(expr);
3648                 nf_tables_expr_destroy(ctx, expr);
3649                 expr = next;
3650         }
3651         kfree(rule);
3652 }
3653
3654 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3655 {
3656         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3657         nf_tables_rule_destroy(ctx, rule);
3658 }
3659
3660 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3661 {
3662         struct nft_expr *expr, *last;
3663         const struct nft_data *data;
3664         struct nft_rule *rule;
3665         int err;
3666
3667         if (ctx->level == NFT_JUMP_STACK_SIZE)
3668                 return -EMLINK;
3669
3670         list_for_each_entry(rule, &chain->rules, list) {
3671                 if (!nft_is_active_next(ctx->net, rule))
3672                         continue;
3673
3674                 nft_rule_for_each_expr(expr, last, rule) {
3675                         if (!expr->ops->validate)
3676                                 continue;
3677
3678                         err = expr->ops->validate(ctx, expr, &data);
3679                         if (err < 0)
3680                                 return err;
3681                 }
3682
3683                 cond_resched();
3684         }
3685
3686         return 0;
3687 }
3688 EXPORT_SYMBOL_GPL(nft_chain_validate);
3689
3690 static int nft_table_validate(struct net *net, const struct nft_table *table)
3691 {
3692         struct nft_chain *chain;
3693         struct nft_ctx ctx = {
3694                 .net    = net,
3695                 .family = table->family,
3696         };
3697         int err;
3698
3699         list_for_each_entry(chain, &table->chains, list) {
3700                 if (!nft_is_base_chain(chain))
3701                         continue;
3702
3703                 ctx.chain = chain;
3704                 err = nft_chain_validate(&ctx, chain);
3705                 if (err < 0)
3706                         return err;
3707         }
3708
3709         return 0;
3710 }
3711
3712 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3713                          const struct nft_set_iter *iter,
3714                          struct nft_set_elem *elem)
3715 {
3716         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3717         struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3718         const struct nft_data *data;
3719         int err;
3720
3721         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3722             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3723                 return 0;
3724
3725         data = nft_set_ext_data(ext);
3726         switch (data->verdict.code) {
3727         case NFT_JUMP:
3728         case NFT_GOTO:
3729                 pctx->level++;
3730                 err = nft_chain_validate(ctx, data->verdict.chain);
3731                 if (err < 0)
3732                         return err;
3733                 pctx->level--;
3734                 break;
3735         default:
3736                 break;
3737         }
3738
3739         return 0;
3740 }
3741
3742 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3743 {
3744         u8 genmask = nft_genmask_next(ctx->net);
3745         struct nft_set_elem_catchall *catchall;
3746         struct nft_set_elem elem;
3747         struct nft_set_ext *ext;
3748         int ret = 0;
3749
3750         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3751                 ext = nft_set_elem_ext(set, catchall->elem);
3752                 if (!nft_set_elem_active(ext, genmask))
3753                         continue;
3754
3755                 elem.priv = catchall->elem;
3756                 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3757                 if (ret < 0)
3758                         return ret;
3759         }
3760
3761         return ret;
3762 }
3763
3764 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3765                                              const struct nft_chain *chain,
3766                                              const struct nlattr *nla);
3767
3768 #define NFT_RULE_MAXEXPRS       128
3769
3770 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3771                              const struct nlattr * const nla[])
3772 {
3773         struct nftables_pernet *nft_net = nft_pernet(info->net);
3774         struct netlink_ext_ack *extack = info->extack;
3775         unsigned int size, i, n, ulen = 0, usize = 0;
3776         u8 genmask = nft_genmask_next(info->net);
3777         struct nft_rule *rule, *old_rule = NULL;
3778         struct nft_expr_info *expr_info = NULL;
3779         u8 family = info->nfmsg->nfgen_family;
3780         struct nft_flow_rule *flow = NULL;
3781         struct net *net = info->net;
3782         struct nft_userdata *udata;
3783         struct nft_table *table;
3784         struct nft_chain *chain;
3785         struct nft_trans *trans;
3786         u64 handle, pos_handle;
3787         struct nft_expr *expr;
3788         struct nft_ctx ctx;
3789         struct nlattr *tmp;
3790         int err, rem;
3791
3792         lockdep_assert_held(&nft_net->commit_mutex);
3793
3794         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3795                                  NETLINK_CB(skb).portid);
3796         if (IS_ERR(table)) {
3797                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3798                 return PTR_ERR(table);
3799         }
3800
3801         if (nla[NFTA_RULE_CHAIN]) {
3802                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3803                                          genmask);
3804                 if (IS_ERR(chain)) {
3805                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3806                         return PTR_ERR(chain);
3807                 }
3808                 if (nft_chain_is_bound(chain))
3809                         return -EOPNOTSUPP;
3810
3811         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3812                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
3813                 if (IS_ERR(chain)) {
3814                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3815                         return PTR_ERR(chain);
3816                 }
3817         } else {
3818                 return -EINVAL;
3819         }
3820
3821         if (nla[NFTA_RULE_HANDLE]) {
3822                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3823                 rule = __nft_rule_lookup(chain, handle);
3824                 if (IS_ERR(rule)) {
3825                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3826                         return PTR_ERR(rule);
3827                 }
3828
3829                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3830                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3831                         return -EEXIST;
3832                 }
3833                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3834                         old_rule = rule;
3835                 else
3836                         return -EOPNOTSUPP;
3837         } else {
3838                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3839                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3840                         return -EINVAL;
3841                 handle = nf_tables_alloc_handle(table);
3842
3843                 if (chain->use == UINT_MAX)
3844                         return -EOVERFLOW;
3845
3846                 if (nla[NFTA_RULE_POSITION]) {
3847                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3848                         old_rule = __nft_rule_lookup(chain, pos_handle);
3849                         if (IS_ERR(old_rule)) {
3850                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3851                                 return PTR_ERR(old_rule);
3852                         }
3853                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3854                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3855                         if (IS_ERR(old_rule)) {
3856                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3857                                 return PTR_ERR(old_rule);
3858                         }
3859                 }
3860         }
3861
3862         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3863
3864         n = 0;
3865         size = 0;
3866         if (nla[NFTA_RULE_EXPRESSIONS]) {
3867                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3868                                            sizeof(struct nft_expr_info),
3869                                            GFP_KERNEL);
3870                 if (!expr_info)
3871                         return -ENOMEM;
3872
3873                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3874                         err = -EINVAL;
3875                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3876                                 goto err_release_expr;
3877                         if (n == NFT_RULE_MAXEXPRS)
3878                                 goto err_release_expr;
3879                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3880                         if (err < 0) {
3881                                 NL_SET_BAD_ATTR(extack, tmp);
3882                                 goto err_release_expr;
3883                         }
3884                         size += expr_info[n].ops->size;
3885                         n++;
3886                 }
3887         }
3888         /* Check for overflow of dlen field */
3889         err = -EFBIG;
3890         if (size >= 1 << 12)
3891                 goto err_release_expr;
3892
3893         if (nla[NFTA_RULE_USERDATA]) {
3894                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3895                 if (ulen > 0)
3896                         usize = sizeof(struct nft_userdata) + ulen;
3897         }
3898
3899         err = -ENOMEM;
3900         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3901         if (rule == NULL)
3902                 goto err_release_expr;
3903
3904         nft_activate_next(net, rule);
3905
3906         rule->handle = handle;
3907         rule->dlen   = size;
3908         rule->udata  = ulen ? 1 : 0;
3909
3910         if (ulen) {
3911                 udata = nft_userdata(rule);
3912                 udata->len = ulen - 1;
3913                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3914         }
3915
3916         expr = nft_expr_first(rule);
3917         for (i = 0; i < n; i++) {
3918                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3919                 if (err < 0) {
3920                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3921                         goto err_release_rule;
3922                 }
3923
3924                 if (expr_info[i].ops->validate)
3925                         nft_validate_state_update(table, NFT_VALIDATE_NEED);
3926
3927                 expr_info[i].ops = NULL;
3928                 expr = nft_expr_next(expr);
3929         }
3930
3931         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3932                 flow = nft_flow_rule_create(net, rule);
3933                 if (IS_ERR(flow)) {
3934                         err = PTR_ERR(flow);
3935                         goto err_release_rule;
3936                 }
3937         }
3938
3939         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3940                 err = nft_delrule(&ctx, old_rule);
3941                 if (err < 0)
3942                         goto err_destroy_flow_rule;
3943
3944                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3945                 if (trans == NULL) {
3946                         err = -ENOMEM;
3947                         goto err_destroy_flow_rule;
3948                 }
3949                 list_add_tail_rcu(&rule->list, &old_rule->list);
3950         } else {
3951                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3952                 if (!trans) {
3953                         err = -ENOMEM;
3954                         goto err_destroy_flow_rule;
3955                 }
3956
3957                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3958                         if (old_rule)
3959                                 list_add_rcu(&rule->list, &old_rule->list);
3960                         else
3961                                 list_add_tail_rcu(&rule->list, &chain->rules);
3962                  } else {
3963                         if (old_rule)
3964                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3965                         else
3966                                 list_add_rcu(&rule->list, &chain->rules);
3967                 }
3968         }
3969         kvfree(expr_info);
3970         chain->use++;
3971
3972         if (flow)
3973                 nft_trans_flow_rule(trans) = flow;
3974
3975         if (table->validate_state == NFT_VALIDATE_DO)
3976                 return nft_table_validate(net, table);
3977
3978         return 0;
3979
3980 err_destroy_flow_rule:
3981         if (flow)
3982                 nft_flow_rule_destroy(flow);
3983 err_release_rule:
3984         nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
3985         nf_tables_rule_destroy(&ctx, rule);
3986 err_release_expr:
3987         for (i = 0; i < n; i++) {
3988                 if (expr_info[i].ops) {
3989                         module_put(expr_info[i].ops->type->owner);
3990                         if (expr_info[i].ops->type->release_ops)
3991                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3992                 }
3993         }
3994         kvfree(expr_info);
3995
3996         return err;
3997 }
3998
3999 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4000                                              const struct nft_chain *chain,
4001                                              const struct nlattr *nla)
4002 {
4003         struct nftables_pernet *nft_net = nft_pernet(net);
4004         u32 id = ntohl(nla_get_be32(nla));
4005         struct nft_trans *trans;
4006
4007         list_for_each_entry(trans, &nft_net->commit_list, list) {
4008                 if (trans->msg_type == NFT_MSG_NEWRULE &&
4009                     trans->ctx.chain == chain &&
4010                     id == nft_trans_rule_id(trans))
4011                         return nft_trans_rule(trans);
4012         }
4013         return ERR_PTR(-ENOENT);
4014 }
4015
4016 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4017                              const struct nlattr * const nla[])
4018 {
4019         struct netlink_ext_ack *extack = info->extack;
4020         u8 genmask = nft_genmask_next(info->net);
4021         u8 family = info->nfmsg->nfgen_family;
4022         struct nft_chain *chain = NULL;
4023         struct net *net = info->net;
4024         struct nft_table *table;
4025         struct nft_rule *rule;
4026         struct nft_ctx ctx;
4027         int err = 0;
4028
4029         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4030                                  NETLINK_CB(skb).portid);
4031         if (IS_ERR(table)) {
4032                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4033                 return PTR_ERR(table);
4034         }
4035
4036         if (nla[NFTA_RULE_CHAIN]) {
4037                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4038                                          genmask);
4039                 if (IS_ERR(chain)) {
4040                         if (PTR_ERR(chain) == -ENOENT &&
4041                             NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4042                                 return 0;
4043
4044                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4045                         return PTR_ERR(chain);
4046                 }
4047                 if (nft_chain_is_bound(chain))
4048                         return -EOPNOTSUPP;
4049         }
4050
4051         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4052
4053         if (chain) {
4054                 if (nla[NFTA_RULE_HANDLE]) {
4055                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4056                         if (IS_ERR(rule)) {
4057                                 if (PTR_ERR(rule) == -ENOENT &&
4058                                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4059                                         return 0;
4060
4061                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4062                                 return PTR_ERR(rule);
4063                         }
4064
4065                         err = nft_delrule(&ctx, rule);
4066                 } else if (nla[NFTA_RULE_ID]) {
4067                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4068                         if (IS_ERR(rule)) {
4069                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4070                                 return PTR_ERR(rule);
4071                         }
4072
4073                         err = nft_delrule(&ctx, rule);
4074                 } else {
4075                         err = nft_delrule_by_chain(&ctx);
4076                 }
4077         } else {
4078                 list_for_each_entry(chain, &table->chains, list) {
4079                         if (!nft_is_active_next(net, chain))
4080                                 continue;
4081
4082                         ctx.chain = chain;
4083                         err = nft_delrule_by_chain(&ctx);
4084                         if (err < 0)
4085                                 break;
4086                 }
4087         }
4088
4089         return err;
4090 }
4091
4092 /*
4093  * Sets
4094  */
4095 static const struct nft_set_type *nft_set_types[] = {
4096         &nft_set_hash_fast_type,
4097         &nft_set_hash_type,
4098         &nft_set_rhash_type,
4099         &nft_set_bitmap_type,
4100         &nft_set_rbtree_type,
4101 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4102         &nft_set_pipapo_avx2_type,
4103 #endif
4104         &nft_set_pipapo_type,
4105 };
4106
4107 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
4108                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4109                                  NFT_SET_EVAL)
4110
4111 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4112 {
4113         return (flags & type->features) == (flags & NFT_SET_FEATURES);
4114 }
4115
4116 /*
4117  * Select a set implementation based on the data characteristics and the
4118  * given policy. The total memory use might not be known if no size is
4119  * given, in that case the amount of memory per element is used.
4120  */
4121 static const struct nft_set_ops *
4122 nft_select_set_ops(const struct nft_ctx *ctx,
4123                    const struct nlattr * const nla[],
4124                    const struct nft_set_desc *desc)
4125 {
4126         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4127         const struct nft_set_ops *ops, *bops;
4128         struct nft_set_estimate est, best;
4129         const struct nft_set_type *type;
4130         u32 flags = 0;
4131         int i;
4132
4133         lockdep_assert_held(&nft_net->commit_mutex);
4134         lockdep_nfnl_nft_mutex_not_held();
4135
4136         if (nla[NFTA_SET_FLAGS] != NULL)
4137                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4138
4139         bops        = NULL;
4140         best.size   = ~0;
4141         best.lookup = ~0;
4142         best.space  = ~0;
4143
4144         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4145                 type = nft_set_types[i];
4146                 ops = &type->ops;
4147
4148                 if (!nft_set_ops_candidate(type, flags))
4149                         continue;
4150                 if (!ops->estimate(desc, flags, &est))
4151                         continue;
4152
4153                 switch (desc->policy) {
4154                 case NFT_SET_POL_PERFORMANCE:
4155                         if (est.lookup < best.lookup)
4156                                 break;
4157                         if (est.lookup == best.lookup &&
4158                             est.space < best.space)
4159                                 break;
4160                         continue;
4161                 case NFT_SET_POL_MEMORY:
4162                         if (!desc->size) {
4163                                 if (est.space < best.space)
4164                                         break;
4165                                 if (est.space == best.space &&
4166                                     est.lookup < best.lookup)
4167                                         break;
4168                         } else if (est.size < best.size || !bops) {
4169                                 break;
4170                         }
4171                         continue;
4172                 default:
4173                         break;
4174                 }
4175
4176                 bops = ops;
4177                 best = est;
4178         }
4179
4180         if (bops != NULL)
4181                 return bops;
4182
4183         return ERR_PTR(-EOPNOTSUPP);
4184 }
4185
4186 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4187         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
4188                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4189         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
4190                                             .len = NFT_SET_MAXNAMELEN - 1 },
4191         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
4192         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
4193         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
4194         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
4195         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
4196         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
4197         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
4198         [NFTA_SET_ID]                   = { .type = NLA_U32 },
4199         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
4200         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
4201         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
4202                                             .len  = NFT_USERDATA_MAXLEN },
4203         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
4204         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
4205         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
4206         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
4207 };
4208
4209 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4210         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
4211         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
4212 };
4213
4214 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4215                                       const struct nlattr *nla, u8 genmask)
4216 {
4217         struct nft_set *set;
4218
4219         if (nla == NULL)
4220                 return ERR_PTR(-EINVAL);
4221
4222         list_for_each_entry_rcu(set, &table->sets, list) {
4223                 if (!nla_strcmp(nla, set->name) &&
4224                     nft_active_genmask(set, genmask))
4225                         return set;
4226         }
4227         return ERR_PTR(-ENOENT);
4228 }
4229
4230 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4231                                                const struct nlattr *nla,
4232                                                u8 genmask)
4233 {
4234         struct nft_set *set;
4235
4236         list_for_each_entry(set, &table->sets, list) {
4237                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4238                     nft_active_genmask(set, genmask))
4239                         return set;
4240         }
4241         return ERR_PTR(-ENOENT);
4242 }
4243
4244 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4245                                            const struct nft_table *table,
4246                                            const struct nlattr *nla, u8 genmask)
4247 {
4248         struct nftables_pernet *nft_net = nft_pernet(net);
4249         u32 id = ntohl(nla_get_be32(nla));
4250         struct nft_trans *trans;
4251
4252         list_for_each_entry(trans, &nft_net->commit_list, list) {
4253                 if (trans->msg_type == NFT_MSG_NEWSET) {
4254                         struct nft_set *set = nft_trans_set(trans);
4255
4256                         if (id == nft_trans_set_id(trans) &&
4257                             set->table == table &&
4258                             nft_active_genmask(set, genmask))
4259                                 return set;
4260                 }
4261         }
4262         return ERR_PTR(-ENOENT);
4263 }
4264
4265 struct nft_set *nft_set_lookup_global(const struct net *net,
4266                                       const struct nft_table *table,
4267                                       const struct nlattr *nla_set_name,
4268                                       const struct nlattr *nla_set_id,
4269                                       u8 genmask)
4270 {
4271         struct nft_set *set;
4272
4273         set = nft_set_lookup(table, nla_set_name, genmask);
4274         if (IS_ERR(set)) {
4275                 if (!nla_set_id)
4276                         return set;
4277
4278                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4279         }
4280         return set;
4281 }
4282 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4283
4284 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4285                                     const char *name)
4286 {
4287         const struct nft_set *i;
4288         const char *p;
4289         unsigned long *inuse;
4290         unsigned int n = 0, min = 0;
4291
4292         p = strchr(name, '%');
4293         if (p != NULL) {
4294                 if (p[1] != 'd' || strchr(p + 2, '%'))
4295                         return -EINVAL;
4296
4297                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4298                 if (inuse == NULL)
4299                         return -ENOMEM;
4300 cont:
4301                 list_for_each_entry(i, &ctx->table->sets, list) {
4302                         int tmp;
4303
4304                         if (!nft_is_active_next(ctx->net, i))
4305                                 continue;
4306                         if (!sscanf(i->name, name, &tmp))
4307                                 continue;
4308                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4309                                 continue;
4310
4311                         set_bit(tmp - min, inuse);
4312                 }
4313
4314                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4315                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4316                         min += BITS_PER_BYTE * PAGE_SIZE;
4317                         memset(inuse, 0, PAGE_SIZE);
4318                         goto cont;
4319                 }
4320                 free_page((unsigned long)inuse);
4321         }
4322
4323         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4324         if (!set->name)
4325                 return -ENOMEM;
4326
4327         list_for_each_entry(i, &ctx->table->sets, list) {
4328                 if (!nft_is_active_next(ctx->net, i))
4329                         continue;
4330                 if (!strcmp(set->name, i->name)) {
4331                         kfree(set->name);
4332                         set->name = NULL;
4333                         return -ENFILE;
4334                 }
4335         }
4336         return 0;
4337 }
4338
4339 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4340 {
4341         u64 ms = be64_to_cpu(nla_get_be64(nla));
4342         u64 max = (u64)(~((u64)0));
4343
4344         max = div_u64(max, NSEC_PER_MSEC);
4345         if (ms >= max)
4346                 return -ERANGE;
4347
4348         ms *= NSEC_PER_MSEC;
4349         *result = nsecs_to_jiffies64(ms);
4350         return 0;
4351 }
4352
4353 __be64 nf_jiffies64_to_msecs(u64 input)
4354 {
4355         return cpu_to_be64(jiffies64_to_msecs(input));
4356 }
4357
4358 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4359                                      const struct nft_set *set)
4360 {
4361         struct nlattr *concat, *field;
4362         int i;
4363
4364         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4365         if (!concat)
4366                 return -ENOMEM;
4367
4368         for (i = 0; i < set->field_count; i++) {
4369                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4370                 if (!field)
4371                         return -ENOMEM;
4372
4373                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4374                                  htonl(set->field_len[i])))
4375                         return -ENOMEM;
4376
4377                 nla_nest_end(skb, field);
4378         }
4379
4380         nla_nest_end(skb, concat);
4381
4382         return 0;
4383 }
4384
4385 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4386                               const struct nft_set *set, u16 event, u16 flags)
4387 {
4388         u64 timeout = READ_ONCE(set->timeout);
4389         u32 gc_int = READ_ONCE(set->gc_int);
4390         u32 portid = ctx->portid;
4391         struct nlmsghdr *nlh;
4392         struct nlattr *nest;
4393         u32 seq = ctx->seq;
4394         int i;
4395
4396         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4397         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4398                            NFNETLINK_V0, nft_base_seq(ctx->net));
4399         if (!nlh)
4400                 goto nla_put_failure;
4401
4402         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4403                 goto nla_put_failure;
4404         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4405                 goto nla_put_failure;
4406         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4407                          NFTA_SET_PAD))
4408                 goto nla_put_failure;
4409
4410         if (event == NFT_MSG_DELSET) {
4411                 nlmsg_end(skb, nlh);
4412                 return 0;
4413         }
4414
4415         if (set->flags != 0)
4416                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4417                         goto nla_put_failure;
4418
4419         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4420                 goto nla_put_failure;
4421         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4422                 goto nla_put_failure;
4423         if (set->flags & NFT_SET_MAP) {
4424                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4425                         goto nla_put_failure;
4426                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4427                         goto nla_put_failure;
4428         }
4429         if (set->flags & NFT_SET_OBJECT &&
4430             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4431                 goto nla_put_failure;
4432
4433         if (timeout &&
4434             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4435                          nf_jiffies64_to_msecs(timeout),
4436                          NFTA_SET_PAD))
4437                 goto nla_put_failure;
4438         if (gc_int &&
4439             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4440                 goto nla_put_failure;
4441
4442         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4443                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4444                         goto nla_put_failure;
4445         }
4446
4447         if (set->udata &&
4448             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4449                 goto nla_put_failure;
4450
4451         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4452         if (!nest)
4453                 goto nla_put_failure;
4454         if (set->size &&
4455             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4456                 goto nla_put_failure;
4457
4458         if (set->field_count > 1 &&
4459             nf_tables_fill_set_concat(skb, set))
4460                 goto nla_put_failure;
4461
4462         nla_nest_end(skb, nest);
4463
4464         if (set->num_exprs == 1) {
4465                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4466                 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4467                         goto nla_put_failure;
4468
4469                 nla_nest_end(skb, nest);
4470         } else if (set->num_exprs > 1) {
4471                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4472                 if (nest == NULL)
4473                         goto nla_put_failure;
4474
4475                 for (i = 0; i < set->num_exprs; i++) {
4476                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4477                                           set->exprs[i], false) < 0)
4478                                 goto nla_put_failure;
4479                 }
4480                 nla_nest_end(skb, nest);
4481         }
4482
4483         nlmsg_end(skb, nlh);
4484         return 0;
4485
4486 nla_put_failure:
4487         nlmsg_trim(skb, nlh);
4488         return -1;
4489 }
4490
4491 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4492                                  const struct nft_set *set, int event,
4493                                  gfp_t gfp_flags)
4494 {
4495         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4496         u32 portid = ctx->portid;
4497         struct sk_buff *skb;
4498         u16 flags = 0;
4499         int err;
4500
4501         if (!ctx->report &&
4502             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4503                 return;
4504
4505         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4506         if (skb == NULL)
4507                 goto err;
4508
4509         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4510                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4511
4512         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4513         if (err < 0) {
4514                 kfree_skb(skb);
4515                 goto err;
4516         }
4517
4518         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4519         return;
4520 err:
4521         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4522 }
4523
4524 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4525 {
4526         const struct nft_set *set;
4527         unsigned int idx, s_idx = cb->args[0];
4528         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4529         struct net *net = sock_net(skb->sk);
4530         struct nft_ctx *ctx = cb->data, ctx_set;
4531         struct nftables_pernet *nft_net;
4532
4533         if (cb->args[1])
4534                 return skb->len;
4535
4536         rcu_read_lock();
4537         nft_net = nft_pernet(net);
4538         cb->seq = READ_ONCE(nft_net->base_seq);
4539
4540         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4541                 if (ctx->family != NFPROTO_UNSPEC &&
4542                     ctx->family != table->family)
4543                         continue;
4544
4545                 if (ctx->table && ctx->table != table)
4546                         continue;
4547
4548                 if (cur_table) {
4549                         if (cur_table != table)
4550                                 continue;
4551
4552                         cur_table = NULL;
4553                 }
4554                 idx = 0;
4555                 list_for_each_entry_rcu(set, &table->sets, list) {
4556                         if (idx < s_idx)
4557                                 goto cont;
4558                         if (!nft_is_active(net, set))
4559                                 goto cont;
4560
4561                         ctx_set = *ctx;
4562                         ctx_set.table = table;
4563                         ctx_set.family = table->family;
4564
4565                         if (nf_tables_fill_set(skb, &ctx_set, set,
4566                                                NFT_MSG_NEWSET,
4567                                                NLM_F_MULTI) < 0) {
4568                                 cb->args[0] = idx;
4569                                 cb->args[2] = (unsigned long) table;
4570                                 goto done;
4571                         }
4572                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4573 cont:
4574                         idx++;
4575                 }
4576                 if (s_idx)
4577                         s_idx = 0;
4578         }
4579         cb->args[1] = 1;
4580 done:
4581         rcu_read_unlock();
4582         return skb->len;
4583 }
4584
4585 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4586 {
4587         struct nft_ctx *ctx_dump = NULL;
4588
4589         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4590         if (ctx_dump == NULL)
4591                 return -ENOMEM;
4592
4593         cb->data = ctx_dump;
4594         return 0;
4595 }
4596
4597 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4598 {
4599         kfree(cb->data);
4600         return 0;
4601 }
4602
4603 /* called with rcu_read_lock held */
4604 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4605                             const struct nlattr * const nla[])
4606 {
4607         struct netlink_ext_ack *extack = info->extack;
4608         u8 genmask = nft_genmask_cur(info->net);
4609         u8 family = info->nfmsg->nfgen_family;
4610         struct nft_table *table = NULL;
4611         struct net *net = info->net;
4612         const struct nft_set *set;
4613         struct sk_buff *skb2;
4614         struct nft_ctx ctx;
4615         int err;
4616
4617         if (nla[NFTA_SET_TABLE]) {
4618                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4619                                          genmask, 0);
4620                 if (IS_ERR(table)) {
4621                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4622                         return PTR_ERR(table);
4623                 }
4624         }
4625
4626         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4627
4628         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4629                 struct netlink_dump_control c = {
4630                         .start = nf_tables_dump_sets_start,
4631                         .dump = nf_tables_dump_sets,
4632                         .done = nf_tables_dump_sets_done,
4633                         .data = &ctx,
4634                         .module = THIS_MODULE,
4635                 };
4636
4637                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4638         }
4639
4640         /* Only accept unspec with dump */
4641         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4642                 return -EAFNOSUPPORT;
4643         if (!nla[NFTA_SET_TABLE])
4644                 return -EINVAL;
4645
4646         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4647         if (IS_ERR(set))
4648                 return PTR_ERR(set);
4649
4650         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4651         if (skb2 == NULL)
4652                 return -ENOMEM;
4653
4654         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4655         if (err < 0)
4656                 goto err_fill_set_info;
4657
4658         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4659
4660 err_fill_set_info:
4661         kfree_skb(skb2);
4662         return err;
4663 }
4664
4665 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4666         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4667 };
4668
4669 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4670                                      struct nft_set_desc *desc)
4671 {
4672         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4673         u32 len;
4674         int err;
4675
4676         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4677                 return -E2BIG;
4678
4679         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4680                                           nft_concat_policy, NULL);
4681         if (err < 0)
4682                 return err;
4683
4684         if (!tb[NFTA_SET_FIELD_LEN])
4685                 return -EINVAL;
4686
4687         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4688         if (!len || len > U8_MAX)
4689                 return -EINVAL;
4690
4691         desc->field_len[desc->field_count++] = len;
4692
4693         return 0;
4694 }
4695
4696 static int nft_set_desc_concat(struct nft_set_desc *desc,
4697                                const struct nlattr *nla)
4698 {
4699         struct nlattr *attr;
4700         u32 num_regs = 0;
4701         int rem, err, i;
4702
4703         nla_for_each_nested(attr, nla, rem) {
4704                 if (nla_type(attr) != NFTA_LIST_ELEM)
4705                         return -EINVAL;
4706
4707                 err = nft_set_desc_concat_parse(attr, desc);
4708                 if (err < 0)
4709                         return err;
4710         }
4711
4712         for (i = 0; i < desc->field_count; i++)
4713                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4714
4715         if (num_regs > NFT_REG32_COUNT)
4716                 return -E2BIG;
4717
4718         return 0;
4719 }
4720
4721 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4722                                     const struct nlattr *nla)
4723 {
4724         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4725         int err;
4726
4727         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4728                                           nft_set_desc_policy, NULL);
4729         if (err < 0)
4730                 return err;
4731
4732         if (da[NFTA_SET_DESC_SIZE] != NULL)
4733                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4734         if (da[NFTA_SET_DESC_CONCAT])
4735                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4736
4737         return err;
4738 }
4739
4740 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4741                               const struct nlattr * const *nla,
4742                               struct nft_expr **exprs, int *num_exprs,
4743                               u32 flags)
4744 {
4745         struct nft_expr *expr;
4746         int err, i;
4747
4748         if (nla[NFTA_SET_EXPR]) {
4749                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4750                 if (IS_ERR(expr)) {
4751                         err = PTR_ERR(expr);
4752                         goto err_set_expr_alloc;
4753                 }
4754                 exprs[0] = expr;
4755                 (*num_exprs)++;
4756         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4757                 struct nlattr *tmp;
4758                 int left;
4759
4760                 if (!(flags & NFT_SET_EXPR)) {
4761                         err = -EINVAL;
4762                         goto err_set_expr_alloc;
4763                 }
4764                 i = 0;
4765                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4766                         if (i == NFT_SET_EXPR_MAX) {
4767                                 err = -E2BIG;
4768                                 goto err_set_expr_alloc;
4769                         }
4770                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4771                                 err = -EINVAL;
4772                                 goto err_set_expr_alloc;
4773                         }
4774                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4775                         if (IS_ERR(expr)) {
4776                                 err = PTR_ERR(expr);
4777                                 goto err_set_expr_alloc;
4778                         }
4779                         exprs[i++] = expr;
4780                         (*num_exprs)++;
4781                 }
4782         }
4783
4784         return 0;
4785
4786 err_set_expr_alloc:
4787         for (i = 0; i < *num_exprs; i++)
4788                 nft_expr_destroy(ctx, exprs[i]);
4789
4790         return err;
4791 }
4792
4793 static bool nft_set_is_same(const struct nft_set *set,
4794                             const struct nft_set_desc *desc,
4795                             struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4796 {
4797         int i;
4798
4799         if (set->ktype != desc->ktype ||
4800             set->dtype != desc->dtype ||
4801             set->flags != flags ||
4802             set->klen != desc->klen ||
4803             set->dlen != desc->dlen ||
4804             set->field_count != desc->field_count ||
4805             set->num_exprs != num_exprs)
4806                 return false;
4807
4808         for (i = 0; i < desc->field_count; i++) {
4809                 if (set->field_len[i] != desc->field_len[i])
4810                         return false;
4811         }
4812
4813         for (i = 0; i < num_exprs; i++) {
4814                 if (set->exprs[i]->ops != exprs[i]->ops)
4815                         return false;
4816         }
4817
4818         return true;
4819 }
4820
4821 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4822                             const struct nlattr * const nla[])
4823 {
4824         struct netlink_ext_ack *extack = info->extack;
4825         u8 genmask = nft_genmask_next(info->net);
4826         u8 family = info->nfmsg->nfgen_family;
4827         const struct nft_set_ops *ops;
4828         struct net *net = info->net;
4829         struct nft_set_desc desc;
4830         struct nft_table *table;
4831         unsigned char *udata;
4832         struct nft_set *set;
4833         struct nft_ctx ctx;
4834         size_t alloc_size;
4835         int num_exprs = 0;
4836         char *name;
4837         int err, i;
4838         u16 udlen;
4839         u32 flags;
4840         u64 size;
4841
4842         if (nla[NFTA_SET_TABLE] == NULL ||
4843             nla[NFTA_SET_NAME] == NULL ||
4844             nla[NFTA_SET_KEY_LEN] == NULL ||
4845             nla[NFTA_SET_ID] == NULL)
4846                 return -EINVAL;
4847
4848         memset(&desc, 0, sizeof(desc));
4849
4850         desc.ktype = NFT_DATA_VALUE;
4851         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4852                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4853                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4854                         return -EINVAL;
4855         }
4856
4857         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4858         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4859                 return -EINVAL;
4860
4861         flags = 0;
4862         if (nla[NFTA_SET_FLAGS] != NULL) {
4863                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4864                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4865                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4866                               NFT_SET_MAP | NFT_SET_EVAL |
4867                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4868                         return -EOPNOTSUPP;
4869                 /* Only one of these operations is supported */
4870                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4871                              (NFT_SET_MAP | NFT_SET_OBJECT))
4872                         return -EOPNOTSUPP;
4873                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4874                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4875                         return -EOPNOTSUPP;
4876         }
4877
4878         desc.dtype = 0;
4879         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4880                 if (!(flags & NFT_SET_MAP))
4881                         return -EINVAL;
4882
4883                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4884                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4885                     desc.dtype != NFT_DATA_VERDICT)
4886                         return -EINVAL;
4887
4888                 if (desc.dtype != NFT_DATA_VERDICT) {
4889                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4890                                 return -EINVAL;
4891                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4892                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4893                                 return -EINVAL;
4894                 } else
4895                         desc.dlen = sizeof(struct nft_verdict);
4896         } else if (flags & NFT_SET_MAP)
4897                 return -EINVAL;
4898
4899         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4900                 if (!(flags & NFT_SET_OBJECT))
4901                         return -EINVAL;
4902
4903                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4904                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4905                     desc.objtype > NFT_OBJECT_MAX)
4906                         return -EOPNOTSUPP;
4907         } else if (flags & NFT_SET_OBJECT)
4908                 return -EINVAL;
4909         else
4910                 desc.objtype = NFT_OBJECT_UNSPEC;
4911
4912         desc.timeout = 0;
4913         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4914                 if (!(flags & NFT_SET_TIMEOUT))
4915                         return -EINVAL;
4916
4917                 if (flags & NFT_SET_ANONYMOUS)
4918                         return -EOPNOTSUPP;
4919
4920                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4921                 if (err)
4922                         return err;
4923         }
4924         desc.gc_int = 0;
4925         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4926                 if (!(flags & NFT_SET_TIMEOUT))
4927                         return -EINVAL;
4928
4929                 if (flags & NFT_SET_ANONYMOUS)
4930                         return -EOPNOTSUPP;
4931
4932                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4933         }
4934
4935         desc.policy = NFT_SET_POL_PERFORMANCE;
4936         if (nla[NFTA_SET_POLICY] != NULL)
4937                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4938
4939         if (nla[NFTA_SET_DESC] != NULL) {
4940                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4941                 if (err < 0)
4942                         return err;
4943
4944                 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4945                         return -EINVAL;
4946         } else if (flags & NFT_SET_CONCAT) {
4947                 return -EINVAL;
4948         }
4949
4950         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4951                 desc.expr = true;
4952
4953         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4954                                  NETLINK_CB(skb).portid);
4955         if (IS_ERR(table)) {
4956                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4957                 return PTR_ERR(table);
4958         }
4959
4960         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4961
4962         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4963         if (IS_ERR(set)) {
4964                 if (PTR_ERR(set) != -ENOENT) {
4965                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4966                         return PTR_ERR(set);
4967                 }
4968         } else {
4969                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
4970
4971                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4972                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4973                         return -EEXIST;
4974                 }
4975                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4976                         return -EOPNOTSUPP;
4977
4978                 if (nft_set_is_anonymous(set))
4979                         return -EOPNOTSUPP;
4980
4981                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
4982                 if (err < 0)
4983                         return err;
4984
4985                 err = 0;
4986                 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
4987                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4988                         err = -EEXIST;
4989                 }
4990
4991                 for (i = 0; i < num_exprs; i++)
4992                         nft_expr_destroy(&ctx, exprs[i]);
4993
4994                 if (err < 0)
4995                         return err;
4996
4997                 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
4998         }
4999
5000         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5001                 return -ENOENT;
5002
5003         ops = nft_select_set_ops(&ctx, nla, &desc);
5004         if (IS_ERR(ops))
5005                 return PTR_ERR(ops);
5006
5007         udlen = 0;
5008         if (nla[NFTA_SET_USERDATA])
5009                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5010
5011         size = 0;
5012         if (ops->privsize != NULL)
5013                 size = ops->privsize(nla, &desc);
5014         alloc_size = sizeof(*set) + size + udlen;
5015         if (alloc_size < size || alloc_size > INT_MAX)
5016                 return -ENOMEM;
5017         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5018         if (!set)
5019                 return -ENOMEM;
5020
5021         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5022         if (!name) {
5023                 err = -ENOMEM;
5024                 goto err_set_name;
5025         }
5026
5027         err = nf_tables_set_alloc_name(&ctx, set, name);
5028         kfree(name);
5029         if (err < 0)
5030                 goto err_set_name;
5031
5032         udata = NULL;
5033         if (udlen) {
5034                 udata = set->data + size;
5035                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5036         }
5037
5038         INIT_LIST_HEAD(&set->bindings);
5039         INIT_LIST_HEAD(&set->catchall_list);
5040         set->table = table;
5041         write_pnet(&set->net, net);
5042         set->ops = ops;
5043         set->ktype = desc.ktype;
5044         set->klen = desc.klen;
5045         set->dtype = desc.dtype;
5046         set->objtype = desc.objtype;
5047         set->dlen = desc.dlen;
5048         set->flags = flags;
5049         set->size = desc.size;
5050         set->policy = desc.policy;
5051         set->udlen = udlen;
5052         set->udata = udata;
5053         set->timeout = desc.timeout;
5054         set->gc_int = desc.gc_int;
5055
5056         set->field_count = desc.field_count;
5057         for (i = 0; i < desc.field_count; i++)
5058                 set->field_len[i] = desc.field_len[i];
5059
5060         err = ops->init(set, &desc, nla);
5061         if (err < 0)
5062                 goto err_set_init;
5063
5064         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5065         if (err < 0)
5066                 goto err_set_destroy;
5067
5068         set->num_exprs = num_exprs;
5069         set->handle = nf_tables_alloc_handle(table);
5070         INIT_LIST_HEAD(&set->pending_update);
5071
5072         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5073         if (err < 0)
5074                 goto err_set_expr_alloc;
5075
5076         list_add_tail_rcu(&set->list, &table->sets);
5077         table->use++;
5078         return 0;
5079
5080 err_set_expr_alloc:
5081         for (i = 0; i < set->num_exprs; i++)
5082                 nft_expr_destroy(&ctx, set->exprs[i]);
5083 err_set_destroy:
5084         ops->destroy(&ctx, set);
5085 err_set_init:
5086         kfree(set->name);
5087 err_set_name:
5088         kvfree(set);
5089         return err;
5090 }
5091
5092 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5093                                      struct nft_set *set)
5094 {
5095         struct nft_set_elem_catchall *next, *catchall;
5096
5097         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5098                 list_del_rcu(&catchall->list);
5099                 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5100                 kfree_rcu(catchall, rcu);
5101         }
5102 }
5103
5104 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5105 {
5106         int i;
5107
5108         if (WARN_ON(set->use > 0))
5109                 return;
5110
5111         for (i = 0; i < set->num_exprs; i++)
5112                 nft_expr_destroy(ctx, set->exprs[i]);
5113
5114         set->ops->destroy(ctx, set);
5115         nft_set_catchall_destroy(ctx, set);
5116         kfree(set->name);
5117         kvfree(set);
5118 }
5119
5120 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5121                             const struct nlattr * const nla[])
5122 {
5123         struct netlink_ext_ack *extack = info->extack;
5124         u8 genmask = nft_genmask_next(info->net);
5125         u8 family = info->nfmsg->nfgen_family;
5126         struct net *net = info->net;
5127         const struct nlattr *attr;
5128         struct nft_table *table;
5129         struct nft_set *set;
5130         struct nft_ctx ctx;
5131
5132         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5133                 return -EAFNOSUPPORT;
5134
5135         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5136                                  genmask, NETLINK_CB(skb).portid);
5137         if (IS_ERR(table)) {
5138                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5139                 return PTR_ERR(table);
5140         }
5141
5142         if (nla[NFTA_SET_HANDLE]) {
5143                 attr = nla[NFTA_SET_HANDLE];
5144                 set = nft_set_lookup_byhandle(table, attr, genmask);
5145         } else {
5146                 attr = nla[NFTA_SET_NAME];
5147                 set = nft_set_lookup(table, attr, genmask);
5148         }
5149
5150         if (IS_ERR(set)) {
5151                 if (PTR_ERR(set) == -ENOENT &&
5152                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5153                         return 0;
5154
5155                 NL_SET_BAD_ATTR(extack, attr);
5156                 return PTR_ERR(set);
5157         }
5158         if (set->use ||
5159             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5160              atomic_read(&set->nelems) > 0)) {
5161                 NL_SET_BAD_ATTR(extack, attr);
5162                 return -EBUSY;
5163         }
5164
5165         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5166
5167         return nft_delset(&ctx, set);
5168 }
5169
5170 static int nft_validate_register_store(const struct nft_ctx *ctx,
5171                                        enum nft_registers reg,
5172                                        const struct nft_data *data,
5173                                        enum nft_data_types type,
5174                                        unsigned int len);
5175
5176 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5177                                      struct nft_set *set,
5178                                      struct nft_set_elem *elem)
5179 {
5180         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5181         enum nft_registers dreg;
5182
5183         dreg = nft_type_to_reg(set->dtype);
5184         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5185                                            set->dtype == NFT_DATA_VERDICT ?
5186                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
5187                                            set->dlen);
5188 }
5189
5190 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5191                                         struct nft_set *set,
5192                                         const struct nft_set_iter *iter,
5193                                         struct nft_set_elem *elem)
5194 {
5195         return nft_setelem_data_validate(ctx, set, elem);
5196 }
5197
5198 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5199                                        struct nft_set *set)
5200 {
5201         u8 genmask = nft_genmask_next(ctx->net);
5202         struct nft_set_elem_catchall *catchall;
5203         struct nft_set_elem elem;
5204         struct nft_set_ext *ext;
5205         int ret = 0;
5206
5207         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5208                 ext = nft_set_elem_ext(set, catchall->elem);
5209                 if (!nft_set_elem_active(ext, genmask))
5210                         continue;
5211
5212                 elem.priv = catchall->elem;
5213                 ret = nft_setelem_data_validate(ctx, set, &elem);
5214                 if (ret < 0)
5215                         break;
5216         }
5217
5218         return ret;
5219 }
5220
5221 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5222                        struct nft_set_binding *binding)
5223 {
5224         struct nft_set_binding *i;
5225         struct nft_set_iter iter;
5226
5227         if (set->use == UINT_MAX)
5228                 return -EOVERFLOW;
5229
5230         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5231                 return -EBUSY;
5232
5233         if (binding->flags & NFT_SET_MAP) {
5234                 /* If the set is already bound to the same chain all
5235                  * jumps are already validated for that chain.
5236                  */
5237                 list_for_each_entry(i, &set->bindings, list) {
5238                         if (i->flags & NFT_SET_MAP &&
5239                             i->chain == binding->chain)
5240                                 goto bind;
5241                 }
5242
5243                 iter.genmask    = nft_genmask_next(ctx->net);
5244                 iter.skip       = 0;
5245                 iter.count      = 0;
5246                 iter.err        = 0;
5247                 iter.fn         = nf_tables_bind_check_setelem;
5248
5249                 set->ops->walk(ctx, set, &iter);
5250                 if (!iter.err)
5251                         iter.err = nft_set_catchall_bind_check(ctx, set);
5252
5253                 if (iter.err < 0)
5254                         return iter.err;
5255         }
5256 bind:
5257         binding->chain = ctx->chain;
5258         list_add_tail_rcu(&binding->list, &set->bindings);
5259         nft_set_trans_bind(ctx, set);
5260         set->use++;
5261
5262         return 0;
5263 }
5264 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5265
5266 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5267                                  struct nft_set_binding *binding, bool event)
5268 {
5269         list_del_rcu(&binding->list);
5270
5271         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5272                 list_del_rcu(&set->list);
5273                 if (event)
5274                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5275                                              GFP_KERNEL);
5276         }
5277 }
5278
5279 static void nft_setelem_data_activate(const struct net *net,
5280                                       const struct nft_set *set,
5281                                       struct nft_set_elem *elem);
5282
5283 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5284                                 struct nft_set *set,
5285                                 const struct nft_set_iter *iter,
5286                                 struct nft_set_elem *elem)
5287 {
5288         nft_setelem_data_activate(ctx->net, set, elem);
5289
5290         return 0;
5291 }
5292
5293 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5294                                       struct nft_set *set)
5295 {
5296         u8 genmask = nft_genmask_next(ctx->net);
5297         struct nft_set_elem_catchall *catchall;
5298         struct nft_set_elem elem;
5299         struct nft_set_ext *ext;
5300
5301         list_for_each_entry(catchall, &set->catchall_list, list) {
5302                 ext = nft_set_elem_ext(set, catchall->elem);
5303                 if (!nft_set_elem_active(ext, genmask))
5304                         continue;
5305
5306                 elem.priv = catchall->elem;
5307                 nft_setelem_data_activate(ctx->net, set, &elem);
5308                 break;
5309         }
5310 }
5311
5312 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5313 {
5314         struct nft_set_iter iter = {
5315                 .genmask        = nft_genmask_next(ctx->net),
5316                 .fn             = nft_mapelem_activate,
5317         };
5318
5319         set->ops->walk(ctx, set, &iter);
5320         WARN_ON_ONCE(iter.err);
5321
5322         nft_map_catchall_activate(ctx, set);
5323 }
5324
5325 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5326 {
5327         if (nft_set_is_anonymous(set)) {
5328                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5329                         nft_map_activate(ctx, set);
5330
5331                 nft_clear(ctx->net, set);
5332         }
5333
5334         set->use++;
5335 }
5336 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5337
5338 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5339                               struct nft_set_binding *binding,
5340                               enum nft_trans_phase phase)
5341 {
5342         switch (phase) {
5343         case NFT_TRANS_PREPARE_ERROR:
5344                 nft_set_trans_unbind(ctx, set);
5345                 if (nft_set_is_anonymous(set))
5346                         nft_deactivate_next(ctx->net, set);
5347                 else
5348                         list_del_rcu(&binding->list);
5349
5350                 set->use--;
5351                 break;
5352         case NFT_TRANS_PREPARE:
5353                 if (nft_set_is_anonymous(set)) {
5354                         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5355                                 nft_map_deactivate(ctx, set);
5356
5357                         nft_deactivate_next(ctx->net, set);
5358                 }
5359                 set->use--;
5360                 return;
5361         case NFT_TRANS_ABORT:
5362         case NFT_TRANS_RELEASE:
5363                 if (nft_set_is_anonymous(set) &&
5364                     set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5365                         nft_map_deactivate(ctx, set);
5366
5367                 set->use--;
5368                 fallthrough;
5369         default:
5370                 nf_tables_unbind_set(ctx, set, binding,
5371                                      phase == NFT_TRANS_COMMIT);
5372         }
5373 }
5374 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5375
5376 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5377 {
5378         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5379                 nft_set_destroy(ctx, set);
5380 }
5381 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5382
5383 const struct nft_set_ext_type nft_set_ext_types[] = {
5384         [NFT_SET_EXT_KEY]               = {
5385                 .align  = __alignof__(u32),
5386         },
5387         [NFT_SET_EXT_DATA]              = {
5388                 .align  = __alignof__(u32),
5389         },
5390         [NFT_SET_EXT_EXPRESSIONS]       = {
5391                 .align  = __alignof__(struct nft_set_elem_expr),
5392         },
5393         [NFT_SET_EXT_OBJREF]            = {
5394                 .len    = sizeof(struct nft_object *),
5395                 .align  = __alignof__(struct nft_object *),
5396         },
5397         [NFT_SET_EXT_FLAGS]             = {
5398                 .len    = sizeof(u8),
5399                 .align  = __alignof__(u8),
5400         },
5401         [NFT_SET_EXT_TIMEOUT]           = {
5402                 .len    = sizeof(u64),
5403                 .align  = __alignof__(u64),
5404         },
5405         [NFT_SET_EXT_EXPIRATION]        = {
5406                 .len    = sizeof(u64),
5407                 .align  = __alignof__(u64),
5408         },
5409         [NFT_SET_EXT_USERDATA]          = {
5410                 .len    = sizeof(struct nft_userdata),
5411                 .align  = __alignof__(struct nft_userdata),
5412         },
5413         [NFT_SET_EXT_KEY_END]           = {
5414                 .align  = __alignof__(u32),
5415         },
5416 };
5417
5418 /*
5419  * Set elements
5420  */
5421
5422 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5423         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
5424         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
5425         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
5426         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
5427         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
5428         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
5429                                             .len = NFT_USERDATA_MAXLEN },
5430         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
5431         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
5432                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
5433         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
5434         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
5435 };
5436
5437 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5438         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
5439                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
5440         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
5441                                             .len = NFT_SET_MAXNAMELEN - 1 },
5442         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
5443         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
5444 };
5445
5446 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5447                                   const struct nft_set *set,
5448                                   const struct nft_set_ext *ext,
5449                                   bool reset)
5450 {
5451         struct nft_set_elem_expr *elem_expr;
5452         u32 size, num_exprs = 0;
5453         struct nft_expr *expr;
5454         struct nlattr *nest;
5455
5456         elem_expr = nft_set_ext_expr(ext);
5457         nft_setelem_expr_foreach(expr, elem_expr, size)
5458                 num_exprs++;
5459
5460         if (num_exprs == 1) {
5461                 expr = nft_setelem_expr_at(elem_expr, 0);
5462                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5463                         return -1;
5464
5465                 return 0;
5466         } else if (num_exprs > 1) {
5467                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5468                 if (nest == NULL)
5469                         goto nla_put_failure;
5470
5471                 nft_setelem_expr_foreach(expr, elem_expr, size) {
5472                         expr = nft_setelem_expr_at(elem_expr, size);
5473                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5474                                 goto nla_put_failure;
5475                 }
5476                 nla_nest_end(skb, nest);
5477         }
5478         return 0;
5479
5480 nla_put_failure:
5481         return -1;
5482 }
5483
5484 static int nf_tables_fill_setelem(struct sk_buff *skb,
5485                                   const struct nft_set *set,
5486                                   const struct nft_set_elem *elem,
5487                                   bool reset)
5488 {
5489         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5490         unsigned char *b = skb_tail_pointer(skb);
5491         struct nlattr *nest;
5492         u64 timeout = 0;
5493
5494         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5495         if (nest == NULL)
5496                 goto nla_put_failure;
5497
5498         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5499             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5500                           NFT_DATA_VALUE, set->klen) < 0)
5501                 goto nla_put_failure;
5502
5503         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5504             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5505                           NFT_DATA_VALUE, set->klen) < 0)
5506                 goto nla_put_failure;
5507
5508         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5509             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5510                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5511                           set->dlen) < 0)
5512                 goto nla_put_failure;
5513
5514         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5515             nft_set_elem_expr_dump(skb, set, ext, reset))
5516                 goto nla_put_failure;
5517
5518         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5519             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5520                            (*nft_set_ext_obj(ext))->key.name) < 0)
5521                 goto nla_put_failure;
5522
5523         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5524             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5525                          htonl(*nft_set_ext_flags(ext))))
5526                 goto nla_put_failure;
5527
5528         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) {
5529                 timeout = *nft_set_ext_timeout(ext);
5530                 if (nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5531                                  nf_jiffies64_to_msecs(timeout),
5532                                  NFTA_SET_ELEM_PAD))
5533                         goto nla_put_failure;
5534         } else if (set->flags & NFT_SET_TIMEOUT) {
5535                 timeout = READ_ONCE(set->timeout);
5536         }
5537
5538         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5539                 u64 expires, now = get_jiffies_64();
5540
5541                 expires = *nft_set_ext_expiration(ext);
5542                 if (time_before64(now, expires))
5543                         expires -= now;
5544                 else
5545                         expires = 0;
5546
5547                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5548                                  nf_jiffies64_to_msecs(expires),
5549                                  NFTA_SET_ELEM_PAD))
5550                         goto nla_put_failure;
5551
5552                 if (reset)
5553                         *nft_set_ext_expiration(ext) = now + timeout;
5554         }
5555
5556         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5557                 struct nft_userdata *udata;
5558
5559                 udata = nft_set_ext_userdata(ext);
5560                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5561                             udata->len + 1, udata->data))
5562                         goto nla_put_failure;
5563         }
5564
5565         nla_nest_end(skb, nest);
5566         return 0;
5567
5568 nla_put_failure:
5569         nlmsg_trim(skb, b);
5570         return -EMSGSIZE;
5571 }
5572
5573 struct nft_set_dump_args {
5574         const struct netlink_callback   *cb;
5575         struct nft_set_iter             iter;
5576         struct sk_buff                  *skb;
5577         bool                            reset;
5578 };
5579
5580 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5581                                   struct nft_set *set,
5582                                   const struct nft_set_iter *iter,
5583                                   struct nft_set_elem *elem)
5584 {
5585         struct nft_set_dump_args *args;
5586
5587         args = container_of(iter, struct nft_set_dump_args, iter);
5588         return nf_tables_fill_setelem(args->skb, set, elem, args->reset);
5589 }
5590
5591 struct nft_set_dump_ctx {
5592         const struct nft_set    *set;
5593         struct nft_ctx          ctx;
5594 };
5595
5596 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5597                                  const struct nft_set *set, bool reset)
5598 {
5599         struct nft_set_elem_catchall *catchall;
5600         u8 genmask = nft_genmask_cur(net);
5601         struct nft_set_elem elem;
5602         struct nft_set_ext *ext;
5603         int ret = 0;
5604
5605         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5606                 ext = nft_set_elem_ext(set, catchall->elem);
5607                 if (!nft_set_elem_active(ext, genmask) ||
5608                     nft_set_elem_expired(ext))
5609                         continue;
5610
5611                 elem.priv = catchall->elem;
5612                 ret = nf_tables_fill_setelem(skb, set, &elem, reset);
5613                 break;
5614         }
5615
5616         return ret;
5617 }
5618
5619 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5620 {
5621         struct nft_set_dump_ctx *dump_ctx = cb->data;
5622         struct net *net = sock_net(skb->sk);
5623         struct nftables_pernet *nft_net;
5624         struct nft_table *table;
5625         struct nft_set *set;
5626         struct nft_set_dump_args args;
5627         bool set_found = false;
5628         struct nlmsghdr *nlh;
5629         struct nlattr *nest;
5630         bool reset = false;
5631         u32 portid, seq;
5632         int event;
5633
5634         rcu_read_lock();
5635         nft_net = nft_pernet(net);
5636         cb->seq = READ_ONCE(nft_net->base_seq);
5637
5638         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5639                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5640                     dump_ctx->ctx.family != table->family)
5641                         continue;
5642
5643                 if (table != dump_ctx->ctx.table)
5644                         continue;
5645
5646                 list_for_each_entry_rcu(set, &table->sets, list) {
5647                         if (set == dump_ctx->set) {
5648                                 set_found = true;
5649                                 break;
5650                         }
5651                 }
5652                 break;
5653         }
5654
5655         if (!set_found) {
5656                 rcu_read_unlock();
5657                 return -ENOENT;
5658         }
5659
5660         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5661         portid = NETLINK_CB(cb->skb).portid;
5662         seq    = cb->nlh->nlmsg_seq;
5663
5664         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5665                            table->family, NFNETLINK_V0, nft_base_seq(net));
5666         if (!nlh)
5667                 goto nla_put_failure;
5668
5669         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5670                 goto nla_put_failure;
5671         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5672                 goto nla_put_failure;
5673
5674         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5675         if (nest == NULL)
5676                 goto nla_put_failure;
5677
5678         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5679                 reset = true;
5680
5681         args.cb                 = cb;
5682         args.skb                = skb;
5683         args.reset              = reset;
5684         args.iter.genmask       = nft_genmask_cur(net);
5685         args.iter.skip          = cb->args[0];
5686         args.iter.count         = 0;
5687         args.iter.err           = 0;
5688         args.iter.fn            = nf_tables_dump_setelem;
5689         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5690
5691         if (!args.iter.err && args.iter.count == cb->args[0])
5692                 args.iter.err = nft_set_catchall_dump(net, skb, set, reset);
5693         rcu_read_unlock();
5694
5695         nla_nest_end(skb, nest);
5696         nlmsg_end(skb, nlh);
5697
5698         if (args.iter.err && args.iter.err != -EMSGSIZE)
5699                 return args.iter.err;
5700         if (args.iter.count == cb->args[0])
5701                 return 0;
5702
5703         cb->args[0] = args.iter.count;
5704         return skb->len;
5705
5706 nla_put_failure:
5707         rcu_read_unlock();
5708         return -ENOSPC;
5709 }
5710
5711 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5712 {
5713         struct nft_set_dump_ctx *dump_ctx = cb->data;
5714
5715         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5716
5717         return cb->data ? 0 : -ENOMEM;
5718 }
5719
5720 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5721 {
5722         kfree(cb->data);
5723         return 0;
5724 }
5725
5726 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5727                                        const struct nft_ctx *ctx, u32 seq,
5728                                        u32 portid, int event, u16 flags,
5729                                        const struct nft_set *set,
5730                                        const struct nft_set_elem *elem,
5731                                        bool reset)
5732 {
5733         struct nlmsghdr *nlh;
5734         struct nlattr *nest;
5735         int err;
5736
5737         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5738         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5739                            NFNETLINK_V0, nft_base_seq(ctx->net));
5740         if (!nlh)
5741                 goto nla_put_failure;
5742
5743         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5744                 goto nla_put_failure;
5745         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5746                 goto nla_put_failure;
5747
5748         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5749         if (nest == NULL)
5750                 goto nla_put_failure;
5751
5752         err = nf_tables_fill_setelem(skb, set, elem, reset);
5753         if (err < 0)
5754                 goto nla_put_failure;
5755
5756         nla_nest_end(skb, nest);
5757
5758         nlmsg_end(skb, nlh);
5759         return 0;
5760
5761 nla_put_failure:
5762         nlmsg_trim(skb, nlh);
5763         return -1;
5764 }
5765
5766 static int nft_setelem_parse_flags(const struct nft_set *set,
5767                                    const struct nlattr *attr, u32 *flags)
5768 {
5769         if (attr == NULL)
5770                 return 0;
5771
5772         *flags = ntohl(nla_get_be32(attr));
5773         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5774                 return -EOPNOTSUPP;
5775         if (!(set->flags & NFT_SET_INTERVAL) &&
5776             *flags & NFT_SET_ELEM_INTERVAL_END)
5777                 return -EINVAL;
5778         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5779             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5780                 return -EINVAL;
5781
5782         return 0;
5783 }
5784
5785 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5786                                  struct nft_data *key, struct nlattr *attr)
5787 {
5788         struct nft_data_desc desc = {
5789                 .type   = NFT_DATA_VALUE,
5790                 .size   = NFT_DATA_VALUE_MAXLEN,
5791                 .len    = set->klen,
5792         };
5793
5794         return nft_data_init(ctx, key, &desc, attr);
5795 }
5796
5797 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5798                                   struct nft_data_desc *desc,
5799                                   struct nft_data *data,
5800                                   struct nlattr *attr)
5801 {
5802         u32 dtype;
5803
5804         if (set->dtype == NFT_DATA_VERDICT)
5805                 dtype = NFT_DATA_VERDICT;
5806         else
5807                 dtype = NFT_DATA_VALUE;
5808
5809         desc->type = dtype;
5810         desc->size = NFT_DATA_VALUE_MAXLEN;
5811         desc->len = set->dlen;
5812         desc->flags = NFT_DATA_DESC_SETELEM;
5813
5814         return nft_data_init(ctx, data, desc, attr);
5815 }
5816
5817 static void *nft_setelem_catchall_get(const struct net *net,
5818                                       const struct nft_set *set)
5819 {
5820         struct nft_set_elem_catchall *catchall;
5821         u8 genmask = nft_genmask_cur(net);
5822         struct nft_set_ext *ext;
5823         void *priv = NULL;
5824
5825         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5826                 ext = nft_set_elem_ext(set, catchall->elem);
5827                 if (!nft_set_elem_active(ext, genmask) ||
5828                     nft_set_elem_expired(ext))
5829                         continue;
5830
5831                 priv = catchall->elem;
5832                 break;
5833         }
5834
5835         return priv;
5836 }
5837
5838 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5839                            struct nft_set_elem *elem, u32 flags)
5840 {
5841         void *priv;
5842
5843         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5844                 priv = set->ops->get(ctx->net, set, elem, flags);
5845                 if (IS_ERR(priv))
5846                         return PTR_ERR(priv);
5847         } else {
5848                 priv = nft_setelem_catchall_get(ctx->net, set);
5849                 if (!priv)
5850                         return -ENOENT;
5851         }
5852         elem->priv = priv;
5853
5854         return 0;
5855 }
5856
5857 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5858                             const struct nlattr *attr, bool reset)
5859 {
5860         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5861         struct nft_set_elem elem;
5862         struct sk_buff *skb;
5863         uint32_t flags = 0;
5864         int err;
5865
5866         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5867                                           nft_set_elem_policy, NULL);
5868         if (err < 0)
5869                 return err;
5870
5871         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5872         if (err < 0)
5873                 return err;
5874
5875         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5876                 return -EINVAL;
5877
5878         if (nla[NFTA_SET_ELEM_KEY]) {
5879                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5880                                             nla[NFTA_SET_ELEM_KEY]);
5881                 if (err < 0)
5882                         return err;
5883         }
5884
5885         if (nla[NFTA_SET_ELEM_KEY_END]) {
5886                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5887                                             nla[NFTA_SET_ELEM_KEY_END]);
5888                 if (err < 0)
5889                         return err;
5890         }
5891
5892         err = nft_setelem_get(ctx, set, &elem, flags);
5893         if (err < 0)
5894                 return err;
5895
5896         err = -ENOMEM;
5897         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5898         if (skb == NULL)
5899                 return err;
5900
5901         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5902                                           NFT_MSG_NEWSETELEM, 0, set, &elem,
5903                                           reset);
5904         if (err < 0)
5905                 goto err_fill_setelem;
5906
5907         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5908
5909 err_fill_setelem:
5910         kfree_skb(skb);
5911         return err;
5912 }
5913
5914 /* called with rcu_read_lock held */
5915 static int nf_tables_getsetelem(struct sk_buff *skb,
5916                                 const struct nfnl_info *info,
5917                                 const struct nlattr * const nla[])
5918 {
5919         struct netlink_ext_ack *extack = info->extack;
5920         u8 genmask = nft_genmask_cur(info->net);
5921         u8 family = info->nfmsg->nfgen_family;
5922         struct net *net = info->net;
5923         struct nft_table *table;
5924         struct nft_set *set;
5925         struct nlattr *attr;
5926         struct nft_ctx ctx;
5927         bool reset = false;
5928         int rem, err = 0;
5929
5930         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5931                                  genmask, 0);
5932         if (IS_ERR(table)) {
5933                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5934                 return PTR_ERR(table);
5935         }
5936
5937         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5938         if (IS_ERR(set))
5939                 return PTR_ERR(set);
5940
5941         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5942
5943         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5944                 struct netlink_dump_control c = {
5945                         .start = nf_tables_dump_set_start,
5946                         .dump = nf_tables_dump_set,
5947                         .done = nf_tables_dump_set_done,
5948                         .module = THIS_MODULE,
5949                 };
5950                 struct nft_set_dump_ctx dump_ctx = {
5951                         .set = set,
5952                         .ctx = ctx,
5953                 };
5954
5955                 c.data = &dump_ctx;
5956                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5957         }
5958
5959         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5960                 return -EINVAL;
5961
5962         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5963                 reset = true;
5964
5965         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5966                 err = nft_get_set_elem(&ctx, set, attr, reset);
5967                 if (err < 0) {
5968                         NL_SET_BAD_ATTR(extack, attr);
5969                         break;
5970                 }
5971         }
5972
5973         return err;
5974 }
5975
5976 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5977                                      const struct nft_set *set,
5978                                      const struct nft_set_elem *elem,
5979                                      int event)
5980 {
5981         struct nftables_pernet *nft_net;
5982         struct net *net = ctx->net;
5983         u32 portid = ctx->portid;
5984         struct sk_buff *skb;
5985         u16 flags = 0;
5986         int err;
5987
5988         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5989                 return;
5990
5991         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5992         if (skb == NULL)
5993                 goto err;
5994
5995         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5996                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5997
5998         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5999                                           set, elem, false);
6000         if (err < 0) {
6001                 kfree_skb(skb);
6002                 goto err;
6003         }
6004
6005         nft_net = nft_pernet(net);
6006         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6007         return;
6008 err:
6009         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6010 }
6011
6012 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6013                                               int msg_type,
6014                                               struct nft_set *set)
6015 {
6016         struct nft_trans *trans;
6017
6018         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6019         if (trans == NULL)
6020                 return NULL;
6021
6022         nft_trans_elem_set(trans) = set;
6023         return trans;
6024 }
6025
6026 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6027                                          const struct nft_set *set,
6028                                          const struct nlattr *attr)
6029 {
6030         struct nft_expr *expr;
6031         int err;
6032
6033         expr = nft_expr_init(ctx, attr);
6034         if (IS_ERR(expr))
6035                 return expr;
6036
6037         err = -EOPNOTSUPP;
6038         if (expr->ops->type->flags & NFT_EXPR_GC) {
6039                 if (set->flags & NFT_SET_TIMEOUT)
6040                         goto err_set_elem_expr;
6041                 if (!set->ops->gc_init)
6042                         goto err_set_elem_expr;
6043                 set->ops->gc_init(set);
6044         }
6045
6046         return expr;
6047
6048 err_set_elem_expr:
6049         nft_expr_destroy(ctx, expr);
6050         return ERR_PTR(err);
6051 }
6052
6053 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6054 {
6055         len += nft_set_ext_types[id].len;
6056         if (len > tmpl->ext_len[id] ||
6057             len > U8_MAX)
6058                 return -1;
6059
6060         return 0;
6061 }
6062
6063 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6064                               void *to, const void *from, u32 len)
6065 {
6066         if (nft_set_ext_check(tmpl, id, len) < 0)
6067                 return -1;
6068
6069         memcpy(to, from, len);
6070
6071         return 0;
6072 }
6073
6074 void *nft_set_elem_init(const struct nft_set *set,
6075                         const struct nft_set_ext_tmpl *tmpl,
6076                         const u32 *key, const u32 *key_end,
6077                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
6078 {
6079         struct nft_set_ext *ext;
6080         void *elem;
6081
6082         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6083         if (elem == NULL)
6084                 return ERR_PTR(-ENOMEM);
6085
6086         ext = nft_set_elem_ext(set, elem);
6087         nft_set_ext_init(ext, tmpl);
6088
6089         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6090             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6091                                nft_set_ext_key(ext), key, set->klen) < 0)
6092                 goto err_ext_check;
6093
6094         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6095             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6096                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6097                 goto err_ext_check;
6098
6099         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6100             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6101                                nft_set_ext_data(ext), data, set->dlen) < 0)
6102                 goto err_ext_check;
6103
6104         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6105                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6106                 if (expiration == 0)
6107                         *nft_set_ext_expiration(ext) += timeout;
6108         }
6109         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6110                 *nft_set_ext_timeout(ext) = timeout;
6111
6112         return elem;
6113
6114 err_ext_check:
6115         kfree(elem);
6116
6117         return ERR_PTR(-EINVAL);
6118 }
6119
6120 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6121                                         struct nft_expr *expr)
6122 {
6123         if (expr->ops->destroy_clone) {
6124                 expr->ops->destroy_clone(ctx, expr);
6125                 module_put(expr->ops->type->owner);
6126         } else {
6127                 nf_tables_expr_destroy(ctx, expr);
6128         }
6129 }
6130
6131 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6132                                       struct nft_set_elem_expr *elem_expr)
6133 {
6134         struct nft_expr *expr;
6135         u32 size;
6136
6137         nft_setelem_expr_foreach(expr, elem_expr, size)
6138                 __nft_set_elem_expr_destroy(ctx, expr);
6139 }
6140
6141 /* Drop references and destroy. Called from gc, dynset and abort path. */
6142 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
6143                           bool destroy_expr)
6144 {
6145         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6146         struct nft_ctx ctx = {
6147                 .net    = read_pnet(&set->net),
6148                 .family = set->table->family,
6149         };
6150
6151         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6152         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6153                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6154         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6155                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6156
6157         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6158                 (*nft_set_ext_obj(ext))->use--;
6159         kfree(elem);
6160 }
6161 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6162
6163 /* Destroy element. References have been already dropped in the preparation
6164  * path via nft_setelem_data_deactivate().
6165  */
6166 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6167                                 const struct nft_set *set, void *elem)
6168 {
6169         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6170
6171         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6172                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6173
6174         kfree(elem);
6175 }
6176
6177 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6178                             struct nft_expr *expr_array[])
6179 {
6180         struct nft_expr *expr;
6181         int err, i, k;
6182
6183         for (i = 0; i < set->num_exprs; i++) {
6184                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6185                 if (!expr)
6186                         goto err_expr;
6187
6188                 err = nft_expr_clone(expr, set->exprs[i]);
6189                 if (err < 0) {
6190                         kfree(expr);
6191                         goto err_expr;
6192                 }
6193                 expr_array[i] = expr;
6194         }
6195
6196         return 0;
6197
6198 err_expr:
6199         for (k = i - 1; k >= 0; k--)
6200                 nft_expr_destroy(ctx, expr_array[k]);
6201
6202         return -ENOMEM;
6203 }
6204
6205 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6206                                    const struct nft_set_ext_tmpl *tmpl,
6207                                    const struct nft_set_ext *ext,
6208                                    struct nft_expr *expr_array[],
6209                                    u32 num_exprs)
6210 {
6211         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6212         u32 len = sizeof(struct nft_set_elem_expr);
6213         struct nft_expr *expr;
6214         int i, err;
6215
6216         if (num_exprs == 0)
6217                 return 0;
6218
6219         for (i = 0; i < num_exprs; i++)
6220                 len += expr_array[i]->ops->size;
6221
6222         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6223                 return -EINVAL;
6224
6225         for (i = 0; i < num_exprs; i++) {
6226                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6227                 err = nft_expr_clone(expr, expr_array[i]);
6228                 if (err < 0)
6229                         goto err_elem_expr_setup;
6230
6231                 elem_expr->size += expr_array[i]->ops->size;
6232                 nft_expr_destroy(ctx, expr_array[i]);
6233                 expr_array[i] = NULL;
6234         }
6235
6236         return 0;
6237
6238 err_elem_expr_setup:
6239         for (; i < num_exprs; i++) {
6240                 nft_expr_destroy(ctx, expr_array[i]);
6241                 expr_array[i] = NULL;
6242         }
6243
6244         return -ENOMEM;
6245 }
6246
6247 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6248                                             const struct nft_set *set)
6249 {
6250         struct nft_set_elem_catchall *catchall;
6251         u8 genmask = nft_genmask_cur(net);
6252         struct nft_set_ext *ext;
6253
6254         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6255                 ext = nft_set_elem_ext(set, catchall->elem);
6256                 if (nft_set_elem_active(ext, genmask) &&
6257                     !nft_set_elem_expired(ext))
6258                         return ext;
6259         }
6260
6261         return NULL;
6262 }
6263 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6264
6265 void *nft_set_catchall_gc(const struct nft_set *set)
6266 {
6267         struct nft_set_elem_catchall *catchall, *next;
6268         struct nft_set_ext *ext;
6269         void *elem = NULL;
6270
6271         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6272                 ext = nft_set_elem_ext(set, catchall->elem);
6273
6274                 if (!nft_set_elem_expired(ext) ||
6275                     nft_set_elem_mark_busy(ext))
6276                         continue;
6277
6278                 elem = catchall->elem;
6279                 list_del_rcu(&catchall->list);
6280                 kfree_rcu(catchall, rcu);
6281                 break;
6282         }
6283
6284         return elem;
6285 }
6286 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
6287
6288 static int nft_setelem_catchall_insert(const struct net *net,
6289                                        struct nft_set *set,
6290                                        const struct nft_set_elem *elem,
6291                                        struct nft_set_ext **pext)
6292 {
6293         struct nft_set_elem_catchall *catchall;
6294         u8 genmask = nft_genmask_next(net);
6295         struct nft_set_ext *ext;
6296
6297         list_for_each_entry(catchall, &set->catchall_list, list) {
6298                 ext = nft_set_elem_ext(set, catchall->elem);
6299                 if (nft_set_elem_active(ext, genmask)) {
6300                         *pext = ext;
6301                         return -EEXIST;
6302                 }
6303         }
6304
6305         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6306         if (!catchall)
6307                 return -ENOMEM;
6308
6309         catchall->elem = elem->priv;
6310         list_add_tail_rcu(&catchall->list, &set->catchall_list);
6311
6312         return 0;
6313 }
6314
6315 static int nft_setelem_insert(const struct net *net,
6316                               struct nft_set *set,
6317                               const struct nft_set_elem *elem,
6318                               struct nft_set_ext **ext, unsigned int flags)
6319 {
6320         int ret;
6321
6322         if (flags & NFT_SET_ELEM_CATCHALL)
6323                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6324         else
6325                 ret = set->ops->insert(net, set, elem, ext);
6326
6327         return ret;
6328 }
6329
6330 static bool nft_setelem_is_catchall(const struct nft_set *set,
6331                                     const struct nft_set_elem *elem)
6332 {
6333         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6334
6335         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6336             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6337                 return true;
6338
6339         return false;
6340 }
6341
6342 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6343                                  struct nft_set_elem *elem)
6344 {
6345         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6346
6347         if (nft_setelem_is_catchall(set, elem)) {
6348                 nft_set_elem_change_active(net, set, ext);
6349                 nft_set_elem_clear_busy(ext);
6350         } else {
6351                 set->ops->activate(net, set, elem);
6352         }
6353 }
6354
6355 static int nft_setelem_catchall_deactivate(const struct net *net,
6356                                            struct nft_set *set,
6357                                            struct nft_set_elem *elem)
6358 {
6359         struct nft_set_elem_catchall *catchall;
6360         struct nft_set_ext *ext;
6361
6362         list_for_each_entry(catchall, &set->catchall_list, list) {
6363                 ext = nft_set_elem_ext(set, catchall->elem);
6364                 if (!nft_is_active(net, ext) ||
6365                     nft_set_elem_mark_busy(ext))
6366                         continue;
6367
6368                 kfree(elem->priv);
6369                 elem->priv = catchall->elem;
6370                 nft_set_elem_change_active(net, set, ext);
6371                 return 0;
6372         }
6373
6374         return -ENOENT;
6375 }
6376
6377 static int __nft_setelem_deactivate(const struct net *net,
6378                                     struct nft_set *set,
6379                                     struct nft_set_elem *elem)
6380 {
6381         void *priv;
6382
6383         priv = set->ops->deactivate(net, set, elem);
6384         if (!priv)
6385                 return -ENOENT;
6386
6387         kfree(elem->priv);
6388         elem->priv = priv;
6389         set->ndeact++;
6390
6391         return 0;
6392 }
6393
6394 static int nft_setelem_deactivate(const struct net *net,
6395                                   struct nft_set *set,
6396                                   struct nft_set_elem *elem, u32 flags)
6397 {
6398         int ret;
6399
6400         if (flags & NFT_SET_ELEM_CATCHALL)
6401                 ret = nft_setelem_catchall_deactivate(net, set, elem);
6402         else
6403                 ret = __nft_setelem_deactivate(net, set, elem);
6404
6405         return ret;
6406 }
6407
6408 static void nft_setelem_catchall_remove(const struct net *net,
6409                                         const struct nft_set *set,
6410                                         const struct nft_set_elem *elem)
6411 {
6412         struct nft_set_elem_catchall *catchall, *next;
6413
6414         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6415                 if (catchall->elem == elem->priv) {
6416                         list_del_rcu(&catchall->list);
6417                         kfree_rcu(catchall, rcu);
6418                         break;
6419                 }
6420         }
6421 }
6422
6423 static void nft_setelem_remove(const struct net *net,
6424                                const struct nft_set *set,
6425                                const struct nft_set_elem *elem)
6426 {
6427         if (nft_setelem_is_catchall(set, elem))
6428                 nft_setelem_catchall_remove(net, set, elem);
6429         else
6430                 set->ops->remove(net, set, elem);
6431 }
6432
6433 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6434                                       struct nlattr **nla, u32 flags)
6435 {
6436         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6437                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6438                 if (flags & NFT_SET_ELEM_INTERVAL_END)
6439                         return false;
6440
6441                 if (nla[NFTA_SET_ELEM_KEY_END] &&
6442                     flags & NFT_SET_ELEM_CATCHALL)
6443                         return false;
6444         } else {
6445                 if (nla[NFTA_SET_ELEM_KEY_END])
6446                         return false;
6447         }
6448
6449         return true;
6450 }
6451
6452 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6453                             const struct nlattr *attr, u32 nlmsg_flags)
6454 {
6455         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6456         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6457         u8 genmask = nft_genmask_next(ctx->net);
6458         u32 flags = 0, size = 0, num_exprs = 0;
6459         struct nft_set_ext_tmpl tmpl;
6460         struct nft_set_ext *ext, *ext2;
6461         struct nft_set_elem elem;
6462         struct nft_set_binding *binding;
6463         struct nft_object *obj = NULL;
6464         struct nft_userdata *udata;
6465         struct nft_data_desc desc;
6466         enum nft_registers dreg;
6467         struct nft_trans *trans;
6468         u64 timeout;
6469         u64 expiration;
6470         int err, i;
6471         u8 ulen;
6472
6473         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6474                                           nft_set_elem_policy, NULL);
6475         if (err < 0)
6476                 return err;
6477
6478         nft_set_ext_prepare(&tmpl);
6479
6480         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6481         if (err < 0)
6482                 return err;
6483
6484         if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6485             (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6486                 return -EINVAL;
6487
6488         if (flags != 0) {
6489                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6490                 if (err < 0)
6491                         return err;
6492         }
6493
6494         if (set->flags & NFT_SET_MAP) {
6495                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6496                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6497                         return -EINVAL;
6498         } else {
6499                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6500                         return -EINVAL;
6501         }
6502
6503         if (set->flags & NFT_SET_OBJECT) {
6504                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6505                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6506                         return -EINVAL;
6507         } else {
6508                 if (nla[NFTA_SET_ELEM_OBJREF])
6509                         return -EINVAL;
6510         }
6511
6512         if (!nft_setelem_valid_key_end(set, nla, flags))
6513                 return -EINVAL;
6514
6515         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6516              (nla[NFTA_SET_ELEM_DATA] ||
6517               nla[NFTA_SET_ELEM_OBJREF] ||
6518               nla[NFTA_SET_ELEM_TIMEOUT] ||
6519               nla[NFTA_SET_ELEM_EXPIRATION] ||
6520               nla[NFTA_SET_ELEM_USERDATA] ||
6521               nla[NFTA_SET_ELEM_EXPR] ||
6522               nla[NFTA_SET_ELEM_KEY_END] ||
6523               nla[NFTA_SET_ELEM_EXPRESSIONS]))
6524                 return -EINVAL;
6525
6526         timeout = 0;
6527         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6528                 if (!(set->flags & NFT_SET_TIMEOUT))
6529                         return -EINVAL;
6530                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6531                                             &timeout);
6532                 if (err)
6533                         return err;
6534         } else if (set->flags & NFT_SET_TIMEOUT &&
6535                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6536                 timeout = READ_ONCE(set->timeout);
6537         }
6538
6539         expiration = 0;
6540         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6541                 if (!(set->flags & NFT_SET_TIMEOUT))
6542                         return -EINVAL;
6543                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6544                                             &expiration);
6545                 if (err)
6546                         return err;
6547         }
6548
6549         if (nla[NFTA_SET_ELEM_EXPR]) {
6550                 struct nft_expr *expr;
6551
6552                 if (set->num_exprs && set->num_exprs != 1)
6553                         return -EOPNOTSUPP;
6554
6555                 expr = nft_set_elem_expr_alloc(ctx, set,
6556                                                nla[NFTA_SET_ELEM_EXPR]);
6557                 if (IS_ERR(expr))
6558                         return PTR_ERR(expr);
6559
6560                 expr_array[0] = expr;
6561                 num_exprs = 1;
6562
6563                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6564                         err = -EOPNOTSUPP;
6565                         goto err_set_elem_expr;
6566                 }
6567         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6568                 struct nft_expr *expr;
6569                 struct nlattr *tmp;
6570                 int left;
6571
6572                 i = 0;
6573                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6574                         if (i == NFT_SET_EXPR_MAX ||
6575                             (set->num_exprs && set->num_exprs == i)) {
6576                                 err = -E2BIG;
6577                                 goto err_set_elem_expr;
6578                         }
6579                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6580                                 err = -EINVAL;
6581                                 goto err_set_elem_expr;
6582                         }
6583                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6584                         if (IS_ERR(expr)) {
6585                                 err = PTR_ERR(expr);
6586                                 goto err_set_elem_expr;
6587                         }
6588                         expr_array[i] = expr;
6589                         num_exprs++;
6590
6591                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6592                                 err = -EOPNOTSUPP;
6593                                 goto err_set_elem_expr;
6594                         }
6595                         i++;
6596                 }
6597                 if (set->num_exprs && set->num_exprs != i) {
6598                         err = -EOPNOTSUPP;
6599                         goto err_set_elem_expr;
6600                 }
6601         } else if (set->num_exprs > 0 &&
6602                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6603                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6604                 if (err < 0)
6605                         goto err_set_elem_expr_clone;
6606
6607                 num_exprs = set->num_exprs;
6608         }
6609
6610         if (nla[NFTA_SET_ELEM_KEY]) {
6611                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6612                                             nla[NFTA_SET_ELEM_KEY]);
6613                 if (err < 0)
6614                         goto err_set_elem_expr;
6615
6616                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6617                 if (err < 0)
6618                         goto err_parse_key;
6619         }
6620
6621         if (nla[NFTA_SET_ELEM_KEY_END]) {
6622                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6623                                             nla[NFTA_SET_ELEM_KEY_END]);
6624                 if (err < 0)
6625                         goto err_parse_key;
6626
6627                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6628                 if (err < 0)
6629                         goto err_parse_key_end;
6630         }
6631
6632         if (timeout > 0) {
6633                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6634                 if (err < 0)
6635                         goto err_parse_key_end;
6636
6637                 if (timeout != READ_ONCE(set->timeout)) {
6638                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6639                         if (err < 0)
6640                                 goto err_parse_key_end;
6641                 }
6642         }
6643
6644         if (num_exprs) {
6645                 for (i = 0; i < num_exprs; i++)
6646                         size += expr_array[i]->ops->size;
6647
6648                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6649                                              sizeof(struct nft_set_elem_expr) + size);
6650                 if (err < 0)
6651                         goto err_parse_key_end;
6652         }
6653
6654         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6655                 obj = nft_obj_lookup(ctx->net, ctx->table,
6656                                      nla[NFTA_SET_ELEM_OBJREF],
6657                                      set->objtype, genmask);
6658                 if (IS_ERR(obj)) {
6659                         err = PTR_ERR(obj);
6660                         goto err_parse_key_end;
6661                 }
6662                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6663                 if (err < 0)
6664                         goto err_parse_key_end;
6665         }
6666
6667         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6668                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6669                                              nla[NFTA_SET_ELEM_DATA]);
6670                 if (err < 0)
6671                         goto err_parse_key_end;
6672
6673                 dreg = nft_type_to_reg(set->dtype);
6674                 list_for_each_entry(binding, &set->bindings, list) {
6675                         struct nft_ctx bind_ctx = {
6676                                 .net    = ctx->net,
6677                                 .family = ctx->family,
6678                                 .table  = ctx->table,
6679                                 .chain  = (struct nft_chain *)binding->chain,
6680                         };
6681
6682                         if (!(binding->flags & NFT_SET_MAP))
6683                                 continue;
6684
6685                         err = nft_validate_register_store(&bind_ctx, dreg,
6686                                                           &elem.data.val,
6687                                                           desc.type, desc.len);
6688                         if (err < 0)
6689                                 goto err_parse_data;
6690
6691                         if (desc.type == NFT_DATA_VERDICT &&
6692                             (elem.data.val.verdict.code == NFT_GOTO ||
6693                              elem.data.val.verdict.code == NFT_JUMP))
6694                                 nft_validate_state_update(ctx->table,
6695                                                           NFT_VALIDATE_NEED);
6696                 }
6697
6698                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6699                 if (err < 0)
6700                         goto err_parse_data;
6701         }
6702
6703         /* The full maximum length of userdata can exceed the maximum
6704          * offset value (U8_MAX) for following extensions, therefor it
6705          * must be the last extension added.
6706          */
6707         ulen = 0;
6708         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6709                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6710                 if (ulen > 0) {
6711                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6712                                                      ulen);
6713                         if (err < 0)
6714                                 goto err_parse_data;
6715                 }
6716         }
6717
6718         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6719                                       elem.key_end.val.data, elem.data.val.data,
6720                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6721         if (IS_ERR(elem.priv)) {
6722                 err = PTR_ERR(elem.priv);
6723                 goto err_parse_data;
6724         }
6725
6726         ext = nft_set_elem_ext(set, elem.priv);
6727         if (flags)
6728                 *nft_set_ext_flags(ext) = flags;
6729
6730         if (obj) {
6731                 *nft_set_ext_obj(ext) = obj;
6732                 obj->use++;
6733         }
6734         if (ulen > 0) {
6735                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6736                         err = -EINVAL;
6737                         goto err_elem_free;
6738                 }
6739                 udata = nft_set_ext_userdata(ext);
6740                 udata->len = ulen - 1;
6741                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6742         }
6743         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6744         if (err < 0)
6745                 goto err_elem_free;
6746
6747         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6748         if (trans == NULL) {
6749                 err = -ENOMEM;
6750                 goto err_elem_free;
6751         }
6752
6753         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6754
6755         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6756         if (err) {
6757                 if (err == -EEXIST) {
6758                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6759                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6760                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6761                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6762                                 goto err_element_clash;
6763                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6764                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6765                              memcmp(nft_set_ext_data(ext),
6766                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6767                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6768                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6769                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6770                                 goto err_element_clash;
6771                         else if (!(nlmsg_flags & NLM_F_EXCL))
6772                                 err = 0;
6773                 } else if (err == -ENOTEMPTY) {
6774                         /* ENOTEMPTY reports overlapping between this element
6775                          * and an existing one.
6776                          */
6777                         err = -EEXIST;
6778                 }
6779                 goto err_element_clash;
6780         }
6781
6782         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6783                 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
6784
6785                 if (!atomic_add_unless(&set->nelems, 1, max)) {
6786                         err = -ENFILE;
6787                         goto err_set_full;
6788                 }
6789         }
6790
6791         nft_trans_elem(trans) = elem;
6792         nft_trans_commit_list_add_tail(ctx->net, trans);
6793         return 0;
6794
6795 err_set_full:
6796         nft_setelem_remove(ctx->net, set, &elem);
6797 err_element_clash:
6798         kfree(trans);
6799 err_elem_free:
6800         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6801         if (obj)
6802                 obj->use--;
6803 err_parse_data:
6804         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6805                 nft_data_release(&elem.data.val, desc.type);
6806 err_parse_key_end:
6807         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6808 err_parse_key:
6809         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6810 err_set_elem_expr:
6811         for (i = 0; i < num_exprs && expr_array[i]; i++)
6812                 nft_expr_destroy(ctx, expr_array[i]);
6813 err_set_elem_expr_clone:
6814         return err;
6815 }
6816
6817 static int nf_tables_newsetelem(struct sk_buff *skb,
6818                                 const struct nfnl_info *info,
6819                                 const struct nlattr * const nla[])
6820 {
6821         struct netlink_ext_ack *extack = info->extack;
6822         u8 genmask = nft_genmask_next(info->net);
6823         u8 family = info->nfmsg->nfgen_family;
6824         struct net *net = info->net;
6825         const struct nlattr *attr;
6826         struct nft_table *table;
6827         struct nft_set *set;
6828         struct nft_ctx ctx;
6829         int rem, err;
6830
6831         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6832                 return -EINVAL;
6833
6834         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6835                                  genmask, NETLINK_CB(skb).portid);
6836         if (IS_ERR(table)) {
6837                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6838                 return PTR_ERR(table);
6839         }
6840
6841         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6842                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6843         if (IS_ERR(set))
6844                 return PTR_ERR(set);
6845
6846         if (!list_empty(&set->bindings) &&
6847             (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
6848                 return -EBUSY;
6849
6850         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6851
6852         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6853                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6854                 if (err < 0) {
6855                         NL_SET_BAD_ATTR(extack, attr);
6856                         return err;
6857                 }
6858         }
6859
6860         if (table->validate_state == NFT_VALIDATE_DO)
6861                 return nft_table_validate(net, table);
6862
6863         return 0;
6864 }
6865
6866 /**
6867  *      nft_data_hold - hold a nft_data item
6868  *
6869  *      @data: struct nft_data to release
6870  *      @type: type of data
6871  *
6872  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6873  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6874  *      NFT_GOTO verdicts. This function must be called on active data objects
6875  *      from the second phase of the commit protocol.
6876  */
6877 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6878 {
6879         struct nft_chain *chain;
6880
6881         if (type == NFT_DATA_VERDICT) {
6882                 switch (data->verdict.code) {
6883                 case NFT_JUMP:
6884                 case NFT_GOTO:
6885                         chain = data->verdict.chain;
6886                         chain->use++;
6887                         break;
6888                 }
6889         }
6890 }
6891
6892 static void nft_setelem_data_activate(const struct net *net,
6893                                       const struct nft_set *set,
6894                                       struct nft_set_elem *elem)
6895 {
6896         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6897
6898         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6899                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6900         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6901                 (*nft_set_ext_obj(ext))->use++;
6902 }
6903
6904 static void nft_setelem_data_deactivate(const struct net *net,
6905                                         const struct nft_set *set,
6906                                         struct nft_set_elem *elem)
6907 {
6908         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6909
6910         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6911                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6912         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6913                 (*nft_set_ext_obj(ext))->use--;
6914 }
6915
6916 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6917                            const struct nlattr *attr)
6918 {
6919         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6920         struct nft_set_ext_tmpl tmpl;
6921         struct nft_set_elem elem;
6922         struct nft_set_ext *ext;
6923         struct nft_trans *trans;
6924         u32 flags = 0;
6925         int err;
6926
6927         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6928                                           nft_set_elem_policy, NULL);
6929         if (err < 0)
6930                 return err;
6931
6932         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6933         if (err < 0)
6934                 return err;
6935
6936         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6937                 return -EINVAL;
6938
6939         if (!nft_setelem_valid_key_end(set, nla, flags))
6940                 return -EINVAL;
6941
6942         nft_set_ext_prepare(&tmpl);
6943
6944         if (flags != 0) {
6945                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6946                 if (err < 0)
6947                         return err;
6948         }
6949
6950         if (nla[NFTA_SET_ELEM_KEY]) {
6951                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6952                                             nla[NFTA_SET_ELEM_KEY]);
6953                 if (err < 0)
6954                         return err;
6955
6956                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6957                 if (err < 0)
6958                         goto fail_elem;
6959         }
6960
6961         if (nla[NFTA_SET_ELEM_KEY_END]) {
6962                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6963                                             nla[NFTA_SET_ELEM_KEY_END]);
6964                 if (err < 0)
6965                         goto fail_elem;
6966
6967                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6968                 if (err < 0)
6969                         goto fail_elem_key_end;
6970         }
6971
6972         err = -ENOMEM;
6973         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6974                                       elem.key_end.val.data, NULL, 0, 0,
6975                                       GFP_KERNEL_ACCOUNT);
6976         if (IS_ERR(elem.priv)) {
6977                 err = PTR_ERR(elem.priv);
6978                 goto fail_elem_key_end;
6979         }
6980
6981         ext = nft_set_elem_ext(set, elem.priv);
6982         if (flags)
6983                 *nft_set_ext_flags(ext) = flags;
6984
6985         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6986         if (trans == NULL)
6987                 goto fail_trans;
6988
6989         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6990         if (err < 0)
6991                 goto fail_ops;
6992
6993         nft_setelem_data_deactivate(ctx->net, set, &elem);
6994
6995         nft_trans_elem(trans) = elem;
6996         nft_trans_commit_list_add_tail(ctx->net, trans);
6997         return 0;
6998
6999 fail_ops:
7000         kfree(trans);
7001 fail_trans:
7002         kfree(elem.priv);
7003 fail_elem_key_end:
7004         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7005 fail_elem:
7006         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7007         return err;
7008 }
7009
7010 static int nft_setelem_flush(const struct nft_ctx *ctx,
7011                              struct nft_set *set,
7012                              const struct nft_set_iter *iter,
7013                              struct nft_set_elem *elem)
7014 {
7015         struct nft_trans *trans;
7016         int err;
7017
7018         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7019                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
7020         if (!trans)
7021                 return -ENOMEM;
7022
7023         if (!set->ops->flush(ctx->net, set, elem->priv)) {
7024                 err = -ENOENT;
7025                 goto err1;
7026         }
7027         set->ndeact++;
7028
7029         nft_setelem_data_deactivate(ctx->net, set, elem);
7030         nft_trans_elem_set(trans) = set;
7031         nft_trans_elem(trans) = *elem;
7032         nft_trans_commit_list_add_tail(ctx->net, trans);
7033
7034         return 0;
7035 err1:
7036         kfree(trans);
7037         return err;
7038 }
7039
7040 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7041                                     struct nft_set *set,
7042                                     struct nft_set_elem *elem)
7043 {
7044         struct nft_trans *trans;
7045
7046         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7047                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
7048         if (!trans)
7049                 return -ENOMEM;
7050
7051         nft_setelem_data_deactivate(ctx->net, set, elem);
7052         nft_trans_elem_set(trans) = set;
7053         nft_trans_elem(trans) = *elem;
7054         nft_trans_commit_list_add_tail(ctx->net, trans);
7055
7056         return 0;
7057 }
7058
7059 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7060                                   struct nft_set *set)
7061 {
7062         u8 genmask = nft_genmask_next(ctx->net);
7063         struct nft_set_elem_catchall *catchall;
7064         struct nft_set_elem elem;
7065         struct nft_set_ext *ext;
7066         int ret = 0;
7067
7068         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7069                 ext = nft_set_elem_ext(set, catchall->elem);
7070                 if (!nft_set_elem_active(ext, genmask) ||
7071                     nft_set_elem_mark_busy(ext))
7072                         continue;
7073
7074                 elem.priv = catchall->elem;
7075                 ret = __nft_set_catchall_flush(ctx, set, &elem);
7076                 if (ret < 0)
7077                         break;
7078         }
7079
7080         return ret;
7081 }
7082
7083 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7084 {
7085         struct nft_set_iter iter = {
7086                 .genmask        = genmask,
7087                 .fn             = nft_setelem_flush,
7088         };
7089
7090         set->ops->walk(ctx, set, &iter);
7091         if (!iter.err)
7092                 iter.err = nft_set_catchall_flush(ctx, set);
7093
7094         return iter.err;
7095 }
7096
7097 static int nf_tables_delsetelem(struct sk_buff *skb,
7098                                 const struct nfnl_info *info,
7099                                 const struct nlattr * const nla[])
7100 {
7101         struct netlink_ext_ack *extack = info->extack;
7102         u8 genmask = nft_genmask_next(info->net);
7103         u8 family = info->nfmsg->nfgen_family;
7104         struct net *net = info->net;
7105         const struct nlattr *attr;
7106         struct nft_table *table;
7107         struct nft_set *set;
7108         struct nft_ctx ctx;
7109         int rem, err = 0;
7110
7111         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7112                                  genmask, NETLINK_CB(skb).portid);
7113         if (IS_ERR(table)) {
7114                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7115                 return PTR_ERR(table);
7116         }
7117
7118         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7119         if (IS_ERR(set))
7120                 return PTR_ERR(set);
7121
7122         if (!list_empty(&set->bindings) &&
7123             (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
7124                 return -EBUSY;
7125
7126         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7127
7128         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7129                 return nft_set_flush(&ctx, set, genmask);
7130
7131         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7132                 err = nft_del_setelem(&ctx, set, attr);
7133                 if (err == -ENOENT &&
7134                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7135                         continue;
7136
7137                 if (err < 0) {
7138                         NL_SET_BAD_ATTR(extack, attr);
7139                         break;
7140                 }
7141         }
7142         return err;
7143 }
7144
7145 void nft_set_gc_batch_release(struct rcu_head *rcu)
7146 {
7147         struct nft_set_gc_batch *gcb;
7148         unsigned int i;
7149
7150         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
7151         for (i = 0; i < gcb->head.cnt; i++)
7152                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
7153         kfree(gcb);
7154 }
7155
7156 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
7157                                                 gfp_t gfp)
7158 {
7159         struct nft_set_gc_batch *gcb;
7160
7161         gcb = kzalloc(sizeof(*gcb), gfp);
7162         if (gcb == NULL)
7163                 return gcb;
7164         gcb->head.set = set;
7165         return gcb;
7166 }
7167
7168 /*
7169  * Stateful objects
7170  */
7171
7172 /**
7173  *      nft_register_obj- register nf_tables stateful object type
7174  *      @obj_type: object type
7175  *
7176  *      Registers the object type for use with nf_tables. Returns zero on
7177  *      success or a negative errno code otherwise.
7178  */
7179 int nft_register_obj(struct nft_object_type *obj_type)
7180 {
7181         if (obj_type->type == NFT_OBJECT_UNSPEC)
7182                 return -EINVAL;
7183
7184         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7185         list_add_rcu(&obj_type->list, &nf_tables_objects);
7186         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7187         return 0;
7188 }
7189 EXPORT_SYMBOL_GPL(nft_register_obj);
7190
7191 /**
7192  *      nft_unregister_obj - unregister nf_tables object type
7193  *      @obj_type: object type
7194  *
7195  *      Unregisters the object type for use with nf_tables.
7196  */
7197 void nft_unregister_obj(struct nft_object_type *obj_type)
7198 {
7199         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7200         list_del_rcu(&obj_type->list);
7201         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7202 }
7203 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7204
7205 struct nft_object *nft_obj_lookup(const struct net *net,
7206                                   const struct nft_table *table,
7207                                   const struct nlattr *nla, u32 objtype,
7208                                   u8 genmask)
7209 {
7210         struct nft_object_hash_key k = { .table = table };
7211         char search[NFT_OBJ_MAXNAMELEN];
7212         struct rhlist_head *tmp, *list;
7213         struct nft_object *obj;
7214
7215         nla_strscpy(search, nla, sizeof(search));
7216         k.name = search;
7217
7218         WARN_ON_ONCE(!rcu_read_lock_held() &&
7219                      !lockdep_commit_lock_is_held(net));
7220
7221         rcu_read_lock();
7222         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7223         if (!list)
7224                 goto out;
7225
7226         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7227                 if (objtype == obj->ops->type->type &&
7228                     nft_active_genmask(obj, genmask)) {
7229                         rcu_read_unlock();
7230                         return obj;
7231                 }
7232         }
7233 out:
7234         rcu_read_unlock();
7235         return ERR_PTR(-ENOENT);
7236 }
7237 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7238
7239 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7240                                                   const struct nlattr *nla,
7241                                                   u32 objtype, u8 genmask)
7242 {
7243         struct nft_object *obj;
7244
7245         list_for_each_entry(obj, &table->objects, list) {
7246                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7247                     objtype == obj->ops->type->type &&
7248                     nft_active_genmask(obj, genmask))
7249                         return obj;
7250         }
7251         return ERR_PTR(-ENOENT);
7252 }
7253
7254 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7255         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
7256                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
7257         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
7258                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
7259         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
7260         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
7261         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
7262         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
7263                                     .len = NFT_USERDATA_MAXLEN },
7264 };
7265
7266 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7267                                        const struct nft_object_type *type,
7268                                        const struct nlattr *attr)
7269 {
7270         struct nlattr **tb;
7271         const struct nft_object_ops *ops;
7272         struct nft_object *obj;
7273         int err = -ENOMEM;
7274
7275         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7276         if (!tb)
7277                 goto err1;
7278
7279         if (attr) {
7280                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7281                                                   type->policy, NULL);
7282                 if (err < 0)
7283                         goto err2;
7284         } else {
7285                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7286         }
7287
7288         if (type->select_ops) {
7289                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7290                 if (IS_ERR(ops)) {
7291                         err = PTR_ERR(ops);
7292                         goto err2;
7293                 }
7294         } else {
7295                 ops = type->ops;
7296         }
7297
7298         err = -ENOMEM;
7299         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7300         if (!obj)
7301                 goto err2;
7302
7303         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7304         if (err < 0)
7305                 goto err3;
7306
7307         obj->ops = ops;
7308
7309         kfree(tb);
7310         return obj;
7311 err3:
7312         kfree(obj);
7313 err2:
7314         kfree(tb);
7315 err1:
7316         return ERR_PTR(err);
7317 }
7318
7319 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7320                            struct nft_object *obj, bool reset)
7321 {
7322         struct nlattr *nest;
7323
7324         nest = nla_nest_start_noflag(skb, attr);
7325         if (!nest)
7326                 goto nla_put_failure;
7327         if (obj->ops->dump(skb, obj, reset) < 0)
7328                 goto nla_put_failure;
7329         nla_nest_end(skb, nest);
7330         return 0;
7331
7332 nla_put_failure:
7333         return -1;
7334 }
7335
7336 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
7337 {
7338         const struct nft_object_type *type;
7339
7340         list_for_each_entry(type, &nf_tables_objects, list) {
7341                 if (objtype == type->type)
7342                         return type;
7343         }
7344         return NULL;
7345 }
7346
7347 static const struct nft_object_type *
7348 nft_obj_type_get(struct net *net, u32 objtype)
7349 {
7350         const struct nft_object_type *type;
7351
7352         type = __nft_obj_type_get(objtype);
7353         if (type != NULL && try_module_get(type->owner))
7354                 return type;
7355
7356         lockdep_nfnl_nft_mutex_not_held();
7357 #ifdef CONFIG_MODULES
7358         if (type == NULL) {
7359                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7360                         return ERR_PTR(-EAGAIN);
7361         }
7362 #endif
7363         return ERR_PTR(-ENOENT);
7364 }
7365
7366 static int nf_tables_updobj(const struct nft_ctx *ctx,
7367                             const struct nft_object_type *type,
7368                             const struct nlattr *attr,
7369                             struct nft_object *obj)
7370 {
7371         struct nft_object *newobj;
7372         struct nft_trans *trans;
7373         int err = -ENOMEM;
7374
7375         if (!try_module_get(type->owner))
7376                 return -ENOENT;
7377
7378         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7379                                 sizeof(struct nft_trans_obj));
7380         if (!trans)
7381                 goto err_trans;
7382
7383         newobj = nft_obj_init(ctx, type, attr);
7384         if (IS_ERR(newobj)) {
7385                 err = PTR_ERR(newobj);
7386                 goto err_free_trans;
7387         }
7388
7389         nft_trans_obj(trans) = obj;
7390         nft_trans_obj_update(trans) = true;
7391         nft_trans_obj_newobj(trans) = newobj;
7392         nft_trans_commit_list_add_tail(ctx->net, trans);
7393
7394         return 0;
7395
7396 err_free_trans:
7397         kfree(trans);
7398 err_trans:
7399         module_put(type->owner);
7400         return err;
7401 }
7402
7403 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7404                             const struct nlattr * const nla[])
7405 {
7406         struct netlink_ext_ack *extack = info->extack;
7407         u8 genmask = nft_genmask_next(info->net);
7408         u8 family = info->nfmsg->nfgen_family;
7409         const struct nft_object_type *type;
7410         struct net *net = info->net;
7411         struct nft_table *table;
7412         struct nft_object *obj;
7413         struct nft_ctx ctx;
7414         u32 objtype;
7415         int err;
7416
7417         if (!nla[NFTA_OBJ_TYPE] ||
7418             !nla[NFTA_OBJ_NAME] ||
7419             !nla[NFTA_OBJ_DATA])
7420                 return -EINVAL;
7421
7422         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7423                                  NETLINK_CB(skb).portid);
7424         if (IS_ERR(table)) {
7425                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7426                 return PTR_ERR(table);
7427         }
7428
7429         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7430         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7431         if (IS_ERR(obj)) {
7432                 err = PTR_ERR(obj);
7433                 if (err != -ENOENT) {
7434                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7435                         return err;
7436                 }
7437         } else {
7438                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7439                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7440                         return -EEXIST;
7441                 }
7442                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7443                         return -EOPNOTSUPP;
7444
7445                 type = __nft_obj_type_get(objtype);
7446                 if (WARN_ON_ONCE(!type))
7447                         return -ENOENT;
7448
7449                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7450
7451                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7452         }
7453
7454         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7455
7456         type = nft_obj_type_get(net, objtype);
7457         if (IS_ERR(type))
7458                 return PTR_ERR(type);
7459
7460         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7461         if (IS_ERR(obj)) {
7462                 err = PTR_ERR(obj);
7463                 goto err_init;
7464         }
7465         obj->key.table = table;
7466         obj->handle = nf_tables_alloc_handle(table);
7467
7468         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7469         if (!obj->key.name) {
7470                 err = -ENOMEM;
7471                 goto err_strdup;
7472         }
7473
7474         if (nla[NFTA_OBJ_USERDATA]) {
7475                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7476                 if (obj->udata == NULL)
7477                         goto err_userdata;
7478
7479                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7480         }
7481
7482         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7483         if (err < 0)
7484                 goto err_trans;
7485
7486         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7487                               nft_objname_ht_params);
7488         if (err < 0)
7489                 goto err_obj_ht;
7490
7491         list_add_tail_rcu(&obj->list, &table->objects);
7492         table->use++;
7493         return 0;
7494 err_obj_ht:
7495         /* queued in transaction log */
7496         INIT_LIST_HEAD(&obj->list);
7497         return err;
7498 err_trans:
7499         kfree(obj->udata);
7500 err_userdata:
7501         kfree(obj->key.name);
7502 err_strdup:
7503         if (obj->ops->destroy)
7504                 obj->ops->destroy(&ctx, obj);
7505         kfree(obj);
7506 err_init:
7507         module_put(type->owner);
7508         return err;
7509 }
7510
7511 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7512                                    u32 portid, u32 seq, int event, u32 flags,
7513                                    int family, const struct nft_table *table,
7514                                    struct nft_object *obj, bool reset)
7515 {
7516         struct nlmsghdr *nlh;
7517
7518         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7519         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7520                            NFNETLINK_V0, nft_base_seq(net));
7521         if (!nlh)
7522                 goto nla_put_failure;
7523
7524         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7525             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7526             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7527                          NFTA_OBJ_PAD))
7528                 goto nla_put_failure;
7529
7530         if (event == NFT_MSG_DELOBJ) {
7531                 nlmsg_end(skb, nlh);
7532                 return 0;
7533         }
7534
7535         if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7536             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7537             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7538                 goto nla_put_failure;
7539
7540         if (obj->udata &&
7541             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7542                 goto nla_put_failure;
7543
7544         nlmsg_end(skb, nlh);
7545         return 0;
7546
7547 nla_put_failure:
7548         nlmsg_trim(skb, nlh);
7549         return -1;
7550 }
7551
7552 struct nft_obj_filter {
7553         char            *table;
7554         u32             type;
7555 };
7556
7557 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7558 {
7559         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7560         const struct nft_table *table;
7561         unsigned int idx = 0, s_idx = cb->args[0];
7562         struct nft_obj_filter *filter = cb->data;
7563         struct net *net = sock_net(skb->sk);
7564         int family = nfmsg->nfgen_family;
7565         struct nftables_pernet *nft_net;
7566         struct nft_object *obj;
7567         bool reset = false;
7568
7569         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7570                 reset = true;
7571
7572         rcu_read_lock();
7573         nft_net = nft_pernet(net);
7574         cb->seq = READ_ONCE(nft_net->base_seq);
7575
7576         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7577                 if (family != NFPROTO_UNSPEC && family != table->family)
7578                         continue;
7579
7580                 list_for_each_entry_rcu(obj, &table->objects, list) {
7581                         if (!nft_is_active(net, obj))
7582                                 goto cont;
7583                         if (idx < s_idx)
7584                                 goto cont;
7585                         if (idx > s_idx)
7586                                 memset(&cb->args[1], 0,
7587                                        sizeof(cb->args) - sizeof(cb->args[0]));
7588                         if (filter && filter->table &&
7589                             strcmp(filter->table, table->name))
7590                                 goto cont;
7591                         if (filter &&
7592                             filter->type != NFT_OBJECT_UNSPEC &&
7593                             obj->ops->type->type != filter->type)
7594                                 goto cont;
7595                         if (reset) {
7596                                 char *buf = kasprintf(GFP_ATOMIC,
7597                                                       "%s:%u",
7598                                                       table->name,
7599                                                       nft_net->base_seq);
7600
7601                                 audit_log_nfcfg(buf,
7602                                                 family,
7603                                                 obj->handle,
7604                                                 AUDIT_NFT_OP_OBJ_RESET,
7605                                                 GFP_ATOMIC);
7606                                 kfree(buf);
7607                         }
7608
7609                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7610                                                     cb->nlh->nlmsg_seq,
7611                                                     NFT_MSG_NEWOBJ,
7612                                                     NLM_F_MULTI | NLM_F_APPEND,
7613                                                     table->family, table,
7614                                                     obj, reset) < 0)
7615                                 goto done;
7616
7617                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7618 cont:
7619                         idx++;
7620                 }
7621         }
7622 done:
7623         rcu_read_unlock();
7624
7625         cb->args[0] = idx;
7626         return skb->len;
7627 }
7628
7629 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7630 {
7631         const struct nlattr * const *nla = cb->data;
7632         struct nft_obj_filter *filter = NULL;
7633
7634         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7635                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7636                 if (!filter)
7637                         return -ENOMEM;
7638
7639                 if (nla[NFTA_OBJ_TABLE]) {
7640                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7641                         if (!filter->table) {
7642                                 kfree(filter);
7643                                 return -ENOMEM;
7644                         }
7645                 }
7646
7647                 if (nla[NFTA_OBJ_TYPE])
7648                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7649         }
7650
7651         cb->data = filter;
7652         return 0;
7653 }
7654
7655 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7656 {
7657         struct nft_obj_filter *filter = cb->data;
7658
7659         if (filter) {
7660                 kfree(filter->table);
7661                 kfree(filter);
7662         }
7663
7664         return 0;
7665 }
7666
7667 /* called with rcu_read_lock held */
7668 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7669                             const struct nlattr * const nla[])
7670 {
7671         struct netlink_ext_ack *extack = info->extack;
7672         u8 genmask = nft_genmask_cur(info->net);
7673         u8 family = info->nfmsg->nfgen_family;
7674         const struct nft_table *table;
7675         struct net *net = info->net;
7676         struct nft_object *obj;
7677         struct sk_buff *skb2;
7678         bool reset = false;
7679         u32 objtype;
7680         int err;
7681
7682         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7683                 struct netlink_dump_control c = {
7684                         .start = nf_tables_dump_obj_start,
7685                         .dump = nf_tables_dump_obj,
7686                         .done = nf_tables_dump_obj_done,
7687                         .module = THIS_MODULE,
7688                         .data = (void *)nla,
7689                 };
7690
7691                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7692         }
7693
7694         if (!nla[NFTA_OBJ_NAME] ||
7695             !nla[NFTA_OBJ_TYPE])
7696                 return -EINVAL;
7697
7698         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7699         if (IS_ERR(table)) {
7700                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7701                 return PTR_ERR(table);
7702         }
7703
7704         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7705         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7706         if (IS_ERR(obj)) {
7707                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7708                 return PTR_ERR(obj);
7709         }
7710
7711         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7712         if (!skb2)
7713                 return -ENOMEM;
7714
7715         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7716                 reset = true;
7717
7718         if (reset) {
7719                 const struct nftables_pernet *nft_net;
7720                 char *buf;
7721
7722                 nft_net = nft_pernet(net);
7723                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7724
7725                 audit_log_nfcfg(buf,
7726                                 family,
7727                                 obj->handle,
7728                                 AUDIT_NFT_OP_OBJ_RESET,
7729                                 GFP_ATOMIC);
7730                 kfree(buf);
7731         }
7732
7733         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7734                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7735                                       family, table, obj, reset);
7736         if (err < 0)
7737                 goto err_fill_obj_info;
7738
7739         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7740
7741 err_fill_obj_info:
7742         kfree_skb(skb2);
7743         return err;
7744 }
7745
7746 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7747 {
7748         if (obj->ops->destroy)
7749                 obj->ops->destroy(ctx, obj);
7750
7751         module_put(obj->ops->type->owner);
7752         kfree(obj->key.name);
7753         kfree(obj->udata);
7754         kfree(obj);
7755 }
7756
7757 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7758                             const struct nlattr * const nla[])
7759 {
7760         struct netlink_ext_ack *extack = info->extack;
7761         u8 genmask = nft_genmask_next(info->net);
7762         u8 family = info->nfmsg->nfgen_family;
7763         struct net *net = info->net;
7764         const struct nlattr *attr;
7765         struct nft_table *table;
7766         struct nft_object *obj;
7767         struct nft_ctx ctx;
7768         u32 objtype;
7769
7770         if (!nla[NFTA_OBJ_TYPE] ||
7771             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7772                 return -EINVAL;
7773
7774         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7775                                  NETLINK_CB(skb).portid);
7776         if (IS_ERR(table)) {
7777                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7778                 return PTR_ERR(table);
7779         }
7780
7781         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7782         if (nla[NFTA_OBJ_HANDLE]) {
7783                 attr = nla[NFTA_OBJ_HANDLE];
7784                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7785         } else {
7786                 attr = nla[NFTA_OBJ_NAME];
7787                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7788         }
7789
7790         if (IS_ERR(obj)) {
7791                 if (PTR_ERR(obj) == -ENOENT &&
7792                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7793                         return 0;
7794
7795                 NL_SET_BAD_ATTR(extack, attr);
7796                 return PTR_ERR(obj);
7797         }
7798         if (obj->use > 0) {
7799                 NL_SET_BAD_ATTR(extack, attr);
7800                 return -EBUSY;
7801         }
7802
7803         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7804
7805         return nft_delobj(&ctx, obj);
7806 }
7807
7808 void nft_obj_notify(struct net *net, const struct nft_table *table,
7809                     struct nft_object *obj, u32 portid, u32 seq, int event,
7810                     u16 flags, int family, int report, gfp_t gfp)
7811 {
7812         struct nftables_pernet *nft_net = nft_pernet(net);
7813         struct sk_buff *skb;
7814         int err;
7815         char *buf = kasprintf(gfp, "%s:%u",
7816                               table->name, nft_net->base_seq);
7817
7818         audit_log_nfcfg(buf,
7819                         family,
7820                         obj->handle,
7821                         event == NFT_MSG_NEWOBJ ?
7822                                  AUDIT_NFT_OP_OBJ_REGISTER :
7823                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7824                         gfp);
7825         kfree(buf);
7826
7827         if (!report &&
7828             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7829                 return;
7830
7831         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7832         if (skb == NULL)
7833                 goto err;
7834
7835         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7836                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7837                                       family, table, obj, false);
7838         if (err < 0) {
7839                 kfree_skb(skb);
7840                 goto err;
7841         }
7842
7843         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7844         return;
7845 err:
7846         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7847 }
7848 EXPORT_SYMBOL_GPL(nft_obj_notify);
7849
7850 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7851                                  struct nft_object *obj, int event)
7852 {
7853         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7854                        ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7855 }
7856
7857 /*
7858  * Flow tables
7859  */
7860 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7861 {
7862         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7863         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7864         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7865 }
7866 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7867
7868 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7869 {
7870         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7871         list_del_rcu(&type->list);
7872         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7873 }
7874 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7875
7876 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7877         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7878                                             .len = NFT_NAME_MAXLEN - 1 },
7879         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7880                                             .len = NFT_NAME_MAXLEN - 1 },
7881         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7882         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7883         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7884 };
7885
7886 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7887                                            const struct nlattr *nla, u8 genmask)
7888 {
7889         struct nft_flowtable *flowtable;
7890
7891         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7892                 if (!nla_strcmp(nla, flowtable->name) &&
7893                     nft_active_genmask(flowtable, genmask))
7894                         return flowtable;
7895         }
7896         return ERR_PTR(-ENOENT);
7897 }
7898 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7899
7900 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7901                                     struct nft_flowtable *flowtable,
7902                                     enum nft_trans_phase phase)
7903 {
7904         switch (phase) {
7905         case NFT_TRANS_PREPARE_ERROR:
7906         case NFT_TRANS_PREPARE:
7907         case NFT_TRANS_ABORT:
7908         case NFT_TRANS_RELEASE:
7909                 flowtable->use--;
7910                 fallthrough;
7911         default:
7912                 return;
7913         }
7914 }
7915 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7916
7917 static struct nft_flowtable *
7918 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7919                               const struct nlattr *nla, u8 genmask)
7920 {
7921        struct nft_flowtable *flowtable;
7922
7923        list_for_each_entry(flowtable, &table->flowtables, list) {
7924                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7925                    nft_active_genmask(flowtable, genmask))
7926                        return flowtable;
7927        }
7928        return ERR_PTR(-ENOENT);
7929 }
7930
7931 struct nft_flowtable_hook {
7932         u32                     num;
7933         int                     priority;
7934         struct list_head        list;
7935 };
7936
7937 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7938         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
7939         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
7940         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
7941 };
7942
7943 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7944                                     const struct nlattr * const nla[],
7945                                     struct nft_flowtable_hook *flowtable_hook,
7946                                     struct nft_flowtable *flowtable,
7947                                     struct netlink_ext_ack *extack, bool add)
7948 {
7949         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7950         struct nft_hook *hook;
7951         int hooknum, priority;
7952         int err;
7953
7954         INIT_LIST_HEAD(&flowtable_hook->list);
7955
7956         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
7957                                           nla[NFTA_FLOWTABLE_HOOK],
7958                                           nft_flowtable_hook_policy, NULL);
7959         if (err < 0)
7960                 return err;
7961
7962         if (add) {
7963                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7964                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7965                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7966                         return -ENOENT;
7967                 }
7968
7969                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7970                 if (hooknum != NF_NETDEV_INGRESS)
7971                         return -EOPNOTSUPP;
7972
7973                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7974
7975                 flowtable_hook->priority        = priority;
7976                 flowtable_hook->num             = hooknum;
7977         } else {
7978                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7979                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7980                         if (hooknum != flowtable->hooknum)
7981                                 return -EOPNOTSUPP;
7982                 }
7983
7984                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7985                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7986                         if (priority != flowtable->data.priority)
7987                                 return -EOPNOTSUPP;
7988                 }
7989
7990                 flowtable_hook->priority        = flowtable->data.priority;
7991                 flowtable_hook->num             = flowtable->hooknum;
7992         }
7993
7994         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7995                 err = nf_tables_parse_netdev_hooks(ctx->net,
7996                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
7997                                                    &flowtable_hook->list,
7998                                                    extack);
7999                 if (err < 0)
8000                         return err;
8001         }
8002
8003         list_for_each_entry(hook, &flowtable_hook->list, list) {
8004                 hook->ops.pf            = NFPROTO_NETDEV;
8005                 hook->ops.hooknum       = flowtable_hook->num;
8006                 hook->ops.priority      = flowtable_hook->priority;
8007                 hook->ops.priv          = &flowtable->data;
8008                 hook->ops.hook          = flowtable->data.type->hook;
8009         }
8010
8011         return err;
8012 }
8013
8014 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8015 {
8016         const struct nf_flowtable_type *type;
8017
8018         list_for_each_entry(type, &nf_tables_flowtables, list) {
8019                 if (family == type->family)
8020                         return type;
8021         }
8022         return NULL;
8023 }
8024
8025 static const struct nf_flowtable_type *
8026 nft_flowtable_type_get(struct net *net, u8 family)
8027 {
8028         const struct nf_flowtable_type *type;
8029
8030         type = __nft_flowtable_type_get(family);
8031         if (type != NULL && try_module_get(type->owner))
8032                 return type;
8033
8034         lockdep_nfnl_nft_mutex_not_held();
8035 #ifdef CONFIG_MODULES
8036         if (type == NULL) {
8037                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8038                         return ERR_PTR(-EAGAIN);
8039         }
8040 #endif
8041         return ERR_PTR(-ENOENT);
8042 }
8043
8044 /* Only called from error and netdev event paths. */
8045 static void nft_unregister_flowtable_hook(struct net *net,
8046                                           struct nft_flowtable *flowtable,
8047                                           struct nft_hook *hook)
8048 {
8049         nf_unregister_net_hook(net, &hook->ops);
8050         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8051                                     FLOW_BLOCK_UNBIND);
8052 }
8053
8054 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8055                                                  struct list_head *hook_list,
8056                                                  bool release_netdev)
8057 {
8058         struct nft_hook *hook, *next;
8059
8060         list_for_each_entry_safe(hook, next, hook_list, list) {
8061                 nf_unregister_net_hook(net, &hook->ops);
8062                 if (release_netdev) {
8063                         list_del(&hook->list);
8064                         kfree_rcu(hook, rcu);
8065                 }
8066         }
8067 }
8068
8069 static void nft_unregister_flowtable_net_hooks(struct net *net,
8070                                                struct list_head *hook_list)
8071 {
8072         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8073 }
8074
8075 static int nft_register_flowtable_net_hooks(struct net *net,
8076                                             struct nft_table *table,
8077                                             struct list_head *hook_list,
8078                                             struct nft_flowtable *flowtable)
8079 {
8080         struct nft_hook *hook, *hook2, *next;
8081         struct nft_flowtable *ft;
8082         int err, i = 0;
8083
8084         list_for_each_entry(hook, hook_list, list) {
8085                 list_for_each_entry(ft, &table->flowtables, list) {
8086                         if (!nft_is_active_next(net, ft))
8087                                 continue;
8088
8089                         list_for_each_entry(hook2, &ft->hook_list, list) {
8090                                 if (hook->ops.dev == hook2->ops.dev &&
8091                                     hook->ops.pf == hook2->ops.pf) {
8092                                         err = -EEXIST;
8093                                         goto err_unregister_net_hooks;
8094                                 }
8095                         }
8096                 }
8097
8098                 err = flowtable->data.type->setup(&flowtable->data,
8099                                                   hook->ops.dev,
8100                                                   FLOW_BLOCK_BIND);
8101                 if (err < 0)
8102                         goto err_unregister_net_hooks;
8103
8104                 err = nf_register_net_hook(net, &hook->ops);
8105                 if (err < 0) {
8106                         flowtable->data.type->setup(&flowtable->data,
8107                                                     hook->ops.dev,
8108                                                     FLOW_BLOCK_UNBIND);
8109                         goto err_unregister_net_hooks;
8110                 }
8111
8112                 i++;
8113         }
8114
8115         return 0;
8116
8117 err_unregister_net_hooks:
8118         list_for_each_entry_safe(hook, next, hook_list, list) {
8119                 if (i-- <= 0)
8120                         break;
8121
8122                 nft_unregister_flowtable_hook(net, flowtable, hook);
8123                 list_del_rcu(&hook->list);
8124                 kfree_rcu(hook, rcu);
8125         }
8126
8127         return err;
8128 }
8129
8130 static void nft_hooks_destroy(struct list_head *hook_list)
8131 {
8132         struct nft_hook *hook, *next;
8133
8134         list_for_each_entry_safe(hook, next, hook_list, list) {
8135                 list_del_rcu(&hook->list);
8136                 kfree_rcu(hook, rcu);
8137         }
8138 }
8139
8140 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8141                                 struct nft_flowtable *flowtable,
8142                                 struct netlink_ext_ack *extack)
8143 {
8144         const struct nlattr * const *nla = ctx->nla;
8145         struct nft_flowtable_hook flowtable_hook;
8146         struct nft_hook *hook, *next;
8147         struct nft_trans *trans;
8148         bool unregister = false;
8149         u32 flags;
8150         int err;
8151
8152         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8153                                        extack, false);
8154         if (err < 0)
8155                 return err;
8156
8157         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8158                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8159                         list_del(&hook->list);
8160                         kfree(hook);
8161                 }
8162         }
8163
8164         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8165                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8166                 if (flags & ~NFT_FLOWTABLE_MASK) {
8167                         err = -EOPNOTSUPP;
8168                         goto err_flowtable_update_hook;
8169                 }
8170                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8171                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8172                         err = -EOPNOTSUPP;
8173                         goto err_flowtable_update_hook;
8174                 }
8175         } else {
8176                 flags = flowtable->data.flags;
8177         }
8178
8179         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8180                                                &flowtable_hook.list, flowtable);
8181         if (err < 0)
8182                 goto err_flowtable_update_hook;
8183
8184         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8185                                 sizeof(struct nft_trans_flowtable));
8186         if (!trans) {
8187                 unregister = true;
8188                 err = -ENOMEM;
8189                 goto err_flowtable_update_hook;
8190         }
8191
8192         nft_trans_flowtable_flags(trans) = flags;
8193         nft_trans_flowtable(trans) = flowtable;
8194         nft_trans_flowtable_update(trans) = true;
8195         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8196         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8197
8198         nft_trans_commit_list_add_tail(ctx->net, trans);
8199
8200         return 0;
8201
8202 err_flowtable_update_hook:
8203         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8204                 if (unregister)
8205                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8206                 list_del_rcu(&hook->list);
8207                 kfree_rcu(hook, rcu);
8208         }
8209
8210         return err;
8211
8212 }
8213
8214 static int nf_tables_newflowtable(struct sk_buff *skb,
8215                                   const struct nfnl_info *info,
8216                                   const struct nlattr * const nla[])
8217 {
8218         struct netlink_ext_ack *extack = info->extack;
8219         struct nft_flowtable_hook flowtable_hook;
8220         u8 genmask = nft_genmask_next(info->net);
8221         u8 family = info->nfmsg->nfgen_family;
8222         const struct nf_flowtable_type *type;
8223         struct nft_flowtable *flowtable;
8224         struct nft_hook *hook, *next;
8225         struct net *net = info->net;
8226         struct nft_table *table;
8227         struct nft_ctx ctx;
8228         int err;
8229
8230         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8231             !nla[NFTA_FLOWTABLE_NAME] ||
8232             !nla[NFTA_FLOWTABLE_HOOK])
8233                 return -EINVAL;
8234
8235         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8236                                  genmask, NETLINK_CB(skb).portid);
8237         if (IS_ERR(table)) {
8238                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8239                 return PTR_ERR(table);
8240         }
8241
8242         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8243                                          genmask);
8244         if (IS_ERR(flowtable)) {
8245                 err = PTR_ERR(flowtable);
8246                 if (err != -ENOENT) {
8247                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8248                         return err;
8249                 }
8250         } else {
8251                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8252                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8253                         return -EEXIST;
8254                 }
8255
8256                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8257
8258                 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8259         }
8260
8261         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8262
8263         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8264         if (!flowtable)
8265                 return -ENOMEM;
8266
8267         flowtable->table = table;
8268         flowtable->handle = nf_tables_alloc_handle(table);
8269         INIT_LIST_HEAD(&flowtable->hook_list);
8270
8271         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8272         if (!flowtable->name) {
8273                 err = -ENOMEM;
8274                 goto err1;
8275         }
8276
8277         type = nft_flowtable_type_get(net, family);
8278         if (IS_ERR(type)) {
8279                 err = PTR_ERR(type);
8280                 goto err2;
8281         }
8282
8283         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8284                 flowtable->data.flags =
8285                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8286                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8287                         err = -EOPNOTSUPP;
8288                         goto err3;
8289                 }
8290         }
8291
8292         write_pnet(&flowtable->data.net, net);
8293         flowtable->data.type = type;
8294         err = type->init(&flowtable->data);
8295         if (err < 0)
8296                 goto err3;
8297
8298         err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8299                                        extack, true);
8300         if (err < 0)
8301                 goto err4;
8302
8303         list_splice(&flowtable_hook.list, &flowtable->hook_list);
8304         flowtable->data.priority = flowtable_hook.priority;
8305         flowtable->hooknum = flowtable_hook.num;
8306
8307         err = nft_register_flowtable_net_hooks(ctx.net, table,
8308                                                &flowtable->hook_list,
8309                                                flowtable);
8310         if (err < 0) {
8311                 nft_hooks_destroy(&flowtable->hook_list);
8312                 goto err4;
8313         }
8314
8315         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8316         if (err < 0)
8317                 goto err5;
8318
8319         list_add_tail_rcu(&flowtable->list, &table->flowtables);
8320         table->use++;
8321
8322         return 0;
8323 err5:
8324         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8325                 nft_unregister_flowtable_hook(net, flowtable, hook);
8326                 list_del_rcu(&hook->list);
8327                 kfree_rcu(hook, rcu);
8328         }
8329 err4:
8330         flowtable->data.type->free(&flowtable->data);
8331 err3:
8332         module_put(type->owner);
8333 err2:
8334         kfree(flowtable->name);
8335 err1:
8336         kfree(flowtable);
8337         return err;
8338 }
8339
8340 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8341 {
8342         struct nft_hook *this, *next;
8343
8344         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8345                 list_del(&this->list);
8346                 kfree(this);
8347         }
8348 }
8349
8350 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8351                                  struct nft_flowtable *flowtable,
8352                                  struct netlink_ext_ack *extack)
8353 {
8354         const struct nlattr * const *nla = ctx->nla;
8355         struct nft_flowtable_hook flowtable_hook;
8356         LIST_HEAD(flowtable_del_list);
8357         struct nft_hook *this, *hook;
8358         struct nft_trans *trans;
8359         int err;
8360
8361         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8362                                        extack, false);
8363         if (err < 0)
8364                 return err;
8365
8366         list_for_each_entry(this, &flowtable_hook.list, list) {
8367                 hook = nft_hook_list_find(&flowtable->hook_list, this);
8368                 if (!hook) {
8369                         err = -ENOENT;
8370                         goto err_flowtable_del_hook;
8371                 }
8372                 list_move(&hook->list, &flowtable_del_list);
8373         }
8374
8375         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8376                                 sizeof(struct nft_trans_flowtable));
8377         if (!trans) {
8378                 err = -ENOMEM;
8379                 goto err_flowtable_del_hook;
8380         }
8381
8382         nft_trans_flowtable(trans) = flowtable;
8383         nft_trans_flowtable_update(trans) = true;
8384         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8385         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8386         nft_flowtable_hook_release(&flowtable_hook);
8387
8388         nft_trans_commit_list_add_tail(ctx->net, trans);
8389
8390         return 0;
8391
8392 err_flowtable_del_hook:
8393         list_splice(&flowtable_del_list, &flowtable->hook_list);
8394         nft_flowtable_hook_release(&flowtable_hook);
8395
8396         return err;
8397 }
8398
8399 static int nf_tables_delflowtable(struct sk_buff *skb,
8400                                   const struct nfnl_info *info,
8401                                   const struct nlattr * const nla[])
8402 {
8403         struct netlink_ext_ack *extack = info->extack;
8404         u8 genmask = nft_genmask_next(info->net);
8405         u8 family = info->nfmsg->nfgen_family;
8406         struct nft_flowtable *flowtable;
8407         struct net *net = info->net;
8408         const struct nlattr *attr;
8409         struct nft_table *table;
8410         struct nft_ctx ctx;
8411
8412         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8413             (!nla[NFTA_FLOWTABLE_NAME] &&
8414              !nla[NFTA_FLOWTABLE_HANDLE]))
8415                 return -EINVAL;
8416
8417         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8418                                  genmask, NETLINK_CB(skb).portid);
8419         if (IS_ERR(table)) {
8420                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8421                 return PTR_ERR(table);
8422         }
8423
8424         if (nla[NFTA_FLOWTABLE_HANDLE]) {
8425                 attr = nla[NFTA_FLOWTABLE_HANDLE];
8426                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8427         } else {
8428                 attr = nla[NFTA_FLOWTABLE_NAME];
8429                 flowtable = nft_flowtable_lookup(table, attr, genmask);
8430         }
8431
8432         if (IS_ERR(flowtable)) {
8433                 if (PTR_ERR(flowtable) == -ENOENT &&
8434                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8435                         return 0;
8436
8437                 NL_SET_BAD_ATTR(extack, attr);
8438                 return PTR_ERR(flowtable);
8439         }
8440
8441         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8442
8443         if (nla[NFTA_FLOWTABLE_HOOK])
8444                 return nft_delflowtable_hook(&ctx, flowtable, extack);
8445
8446         if (flowtable->use > 0) {
8447                 NL_SET_BAD_ATTR(extack, attr);
8448                 return -EBUSY;
8449         }
8450
8451         return nft_delflowtable(&ctx, flowtable);
8452 }
8453
8454 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8455                                          u32 portid, u32 seq, int event,
8456                                          u32 flags, int family,
8457                                          struct nft_flowtable *flowtable,
8458                                          struct list_head *hook_list)
8459 {
8460         struct nlattr *nest, *nest_devs;
8461         struct nft_hook *hook;
8462         struct nlmsghdr *nlh;
8463
8464         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8465         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8466                            NFNETLINK_V0, nft_base_seq(net));
8467         if (!nlh)
8468                 goto nla_put_failure;
8469
8470         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8471             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8472             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8473                          NFTA_FLOWTABLE_PAD))
8474                 goto nla_put_failure;
8475
8476         if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8477                 nlmsg_end(skb, nlh);
8478                 return 0;
8479         }
8480
8481         if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8482             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8483                 goto nla_put_failure;
8484
8485         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8486         if (!nest)
8487                 goto nla_put_failure;
8488         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8489             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8490                 goto nla_put_failure;
8491
8492         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8493         if (!nest_devs)
8494                 goto nla_put_failure;
8495
8496         if (!hook_list)
8497                 hook_list = &flowtable->hook_list;
8498
8499         list_for_each_entry_rcu(hook, hook_list, list) {
8500                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8501                         goto nla_put_failure;
8502         }
8503         nla_nest_end(skb, nest_devs);
8504         nla_nest_end(skb, nest);
8505
8506         nlmsg_end(skb, nlh);
8507         return 0;
8508
8509 nla_put_failure:
8510         nlmsg_trim(skb, nlh);
8511         return -1;
8512 }
8513
8514 struct nft_flowtable_filter {
8515         char            *table;
8516 };
8517
8518 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8519                                     struct netlink_callback *cb)
8520 {
8521         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8522         struct nft_flowtable_filter *filter = cb->data;
8523         unsigned int idx = 0, s_idx = cb->args[0];
8524         struct net *net = sock_net(skb->sk);
8525         int family = nfmsg->nfgen_family;
8526         struct nft_flowtable *flowtable;
8527         struct nftables_pernet *nft_net;
8528         const struct nft_table *table;
8529
8530         rcu_read_lock();
8531         nft_net = nft_pernet(net);
8532         cb->seq = READ_ONCE(nft_net->base_seq);
8533
8534         list_for_each_entry_rcu(table, &nft_net->tables, list) {
8535                 if (family != NFPROTO_UNSPEC && family != table->family)
8536                         continue;
8537
8538                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8539                         if (!nft_is_active(net, flowtable))
8540                                 goto cont;
8541                         if (idx < s_idx)
8542                                 goto cont;
8543                         if (idx > s_idx)
8544                                 memset(&cb->args[1], 0,
8545                                        sizeof(cb->args) - sizeof(cb->args[0]));
8546                         if (filter && filter->table &&
8547                             strcmp(filter->table, table->name))
8548                                 goto cont;
8549
8550                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8551                                                           cb->nlh->nlmsg_seq,
8552                                                           NFT_MSG_NEWFLOWTABLE,
8553                                                           NLM_F_MULTI | NLM_F_APPEND,
8554                                                           table->family,
8555                                                           flowtable, NULL) < 0)
8556                                 goto done;
8557
8558                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8559 cont:
8560                         idx++;
8561                 }
8562         }
8563 done:
8564         rcu_read_unlock();
8565
8566         cb->args[0] = idx;
8567         return skb->len;
8568 }
8569
8570 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8571 {
8572         const struct nlattr * const *nla = cb->data;
8573         struct nft_flowtable_filter *filter = NULL;
8574
8575         if (nla[NFTA_FLOWTABLE_TABLE]) {
8576                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8577                 if (!filter)
8578                         return -ENOMEM;
8579
8580                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8581                                            GFP_ATOMIC);
8582                 if (!filter->table) {
8583                         kfree(filter);
8584                         return -ENOMEM;
8585                 }
8586         }
8587
8588         cb->data = filter;
8589         return 0;
8590 }
8591
8592 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8593 {
8594         struct nft_flowtable_filter *filter = cb->data;
8595
8596         if (!filter)
8597                 return 0;
8598
8599         kfree(filter->table);
8600         kfree(filter);
8601
8602         return 0;
8603 }
8604
8605 /* called with rcu_read_lock held */
8606 static int nf_tables_getflowtable(struct sk_buff *skb,
8607                                   const struct nfnl_info *info,
8608                                   const struct nlattr * const nla[])
8609 {
8610         u8 genmask = nft_genmask_cur(info->net);
8611         u8 family = info->nfmsg->nfgen_family;
8612         struct nft_flowtable *flowtable;
8613         const struct nft_table *table;
8614         struct net *net = info->net;
8615         struct sk_buff *skb2;
8616         int err;
8617
8618         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8619                 struct netlink_dump_control c = {
8620                         .start = nf_tables_dump_flowtable_start,
8621                         .dump = nf_tables_dump_flowtable,
8622                         .done = nf_tables_dump_flowtable_done,
8623                         .module = THIS_MODULE,
8624                         .data = (void *)nla,
8625                 };
8626
8627                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8628         }
8629
8630         if (!nla[NFTA_FLOWTABLE_NAME])
8631                 return -EINVAL;
8632
8633         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8634                                  genmask, 0);
8635         if (IS_ERR(table))
8636                 return PTR_ERR(table);
8637
8638         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8639                                          genmask);
8640         if (IS_ERR(flowtable))
8641                 return PTR_ERR(flowtable);
8642
8643         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8644         if (!skb2)
8645                 return -ENOMEM;
8646
8647         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8648                                             info->nlh->nlmsg_seq,
8649                                             NFT_MSG_NEWFLOWTABLE, 0, family,
8650                                             flowtable, NULL);
8651         if (err < 0)
8652                 goto err_fill_flowtable_info;
8653
8654         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8655
8656 err_fill_flowtable_info:
8657         kfree_skb(skb2);
8658         return err;
8659 }
8660
8661 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8662                                        struct nft_flowtable *flowtable,
8663                                        struct list_head *hook_list, int event)
8664 {
8665         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8666         struct sk_buff *skb;
8667         u16 flags = 0;
8668         int err;
8669
8670         if (!ctx->report &&
8671             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8672                 return;
8673
8674         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8675         if (skb == NULL)
8676                 goto err;
8677
8678         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8679                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8680
8681         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8682                                             ctx->seq, event, flags,
8683                                             ctx->family, flowtable, hook_list);
8684         if (err < 0) {
8685                 kfree_skb(skb);
8686                 goto err;
8687         }
8688
8689         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8690         return;
8691 err:
8692         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8693 }
8694
8695 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8696 {
8697         struct nft_hook *hook, *next;
8698
8699         flowtable->data.type->free(&flowtable->data);
8700         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8701                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8702                                             FLOW_BLOCK_UNBIND);
8703                 list_del_rcu(&hook->list);
8704                 kfree(hook);
8705         }
8706         kfree(flowtable->name);
8707         module_put(flowtable->data.type->owner);
8708         kfree(flowtable);
8709 }
8710
8711 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8712                                    u32 portid, u32 seq)
8713 {
8714         struct nftables_pernet *nft_net = nft_pernet(net);
8715         struct nlmsghdr *nlh;
8716         char buf[TASK_COMM_LEN];
8717         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8718
8719         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8720                            NFNETLINK_V0, nft_base_seq(net));
8721         if (!nlh)
8722                 goto nla_put_failure;
8723
8724         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8725             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8726             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8727                 goto nla_put_failure;
8728
8729         nlmsg_end(skb, nlh);
8730         return 0;
8731
8732 nla_put_failure:
8733         nlmsg_trim(skb, nlh);
8734         return -EMSGSIZE;
8735 }
8736
8737 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8738                                 struct nft_flowtable *flowtable)
8739 {
8740         struct nft_hook *hook;
8741
8742         list_for_each_entry(hook, &flowtable->hook_list, list) {
8743                 if (hook->ops.dev != dev)
8744                         continue;
8745
8746                 /* flow_offload_netdev_event() cleans up entries for us. */
8747                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8748                 list_del_rcu(&hook->list);
8749                 kfree_rcu(hook, rcu);
8750                 break;
8751         }
8752 }
8753
8754 static int nf_tables_flowtable_event(struct notifier_block *this,
8755                                      unsigned long event, void *ptr)
8756 {
8757         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8758         struct nft_flowtable *flowtable;
8759         struct nftables_pernet *nft_net;
8760         struct nft_table *table;
8761         struct net *net;
8762
8763         if (event != NETDEV_UNREGISTER)
8764                 return 0;
8765
8766         net = dev_net(dev);
8767         nft_net = nft_pernet(net);
8768         mutex_lock(&nft_net->commit_mutex);
8769         list_for_each_entry(table, &nft_net->tables, list) {
8770                 list_for_each_entry(flowtable, &table->flowtables, list) {
8771                         nft_flowtable_event(event, dev, flowtable);
8772                 }
8773         }
8774         mutex_unlock(&nft_net->commit_mutex);
8775
8776         return NOTIFY_DONE;
8777 }
8778
8779 static struct notifier_block nf_tables_flowtable_notifier = {
8780         .notifier_call  = nf_tables_flowtable_event,
8781 };
8782
8783 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8784                                  int event)
8785 {
8786         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8787         struct sk_buff *skb2;
8788         int err;
8789
8790         if (!nlmsg_report(nlh) &&
8791             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8792                 return;
8793
8794         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8795         if (skb2 == NULL)
8796                 goto err;
8797
8798         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8799                                       nlh->nlmsg_seq);
8800         if (err < 0) {
8801                 kfree_skb(skb2);
8802                 goto err;
8803         }
8804
8805         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8806                        nlmsg_report(nlh), GFP_KERNEL);
8807         return;
8808 err:
8809         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8810                           -ENOBUFS);
8811 }
8812
8813 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8814                             const struct nlattr * const nla[])
8815 {
8816         struct sk_buff *skb2;
8817         int err;
8818
8819         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8820         if (skb2 == NULL)
8821                 return -ENOMEM;
8822
8823         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8824                                       info->nlh->nlmsg_seq);
8825         if (err < 0)
8826                 goto err_fill_gen_info;
8827
8828         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8829
8830 err_fill_gen_info:
8831         kfree_skb(skb2);
8832         return err;
8833 }
8834
8835 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8836         [NFT_MSG_NEWTABLE] = {
8837                 .call           = nf_tables_newtable,
8838                 .type           = NFNL_CB_BATCH,
8839                 .attr_count     = NFTA_TABLE_MAX,
8840                 .policy         = nft_table_policy,
8841         },
8842         [NFT_MSG_GETTABLE] = {
8843                 .call           = nf_tables_gettable,
8844                 .type           = NFNL_CB_RCU,
8845                 .attr_count     = NFTA_TABLE_MAX,
8846                 .policy         = nft_table_policy,
8847         },
8848         [NFT_MSG_DELTABLE] = {
8849                 .call           = nf_tables_deltable,
8850                 .type           = NFNL_CB_BATCH,
8851                 .attr_count     = NFTA_TABLE_MAX,
8852                 .policy         = nft_table_policy,
8853         },
8854         [NFT_MSG_DESTROYTABLE] = {
8855                 .call           = nf_tables_deltable,
8856                 .type           = NFNL_CB_BATCH,
8857                 .attr_count     = NFTA_TABLE_MAX,
8858                 .policy         = nft_table_policy,
8859         },
8860         [NFT_MSG_NEWCHAIN] = {
8861                 .call           = nf_tables_newchain,
8862                 .type           = NFNL_CB_BATCH,
8863                 .attr_count     = NFTA_CHAIN_MAX,
8864                 .policy         = nft_chain_policy,
8865         },
8866         [NFT_MSG_GETCHAIN] = {
8867                 .call           = nf_tables_getchain,
8868                 .type           = NFNL_CB_RCU,
8869                 .attr_count     = NFTA_CHAIN_MAX,
8870                 .policy         = nft_chain_policy,
8871         },
8872         [NFT_MSG_DELCHAIN] = {
8873                 .call           = nf_tables_delchain,
8874                 .type           = NFNL_CB_BATCH,
8875                 .attr_count     = NFTA_CHAIN_MAX,
8876                 .policy         = nft_chain_policy,
8877         },
8878         [NFT_MSG_DESTROYCHAIN] = {
8879                 .call           = nf_tables_delchain,
8880                 .type           = NFNL_CB_BATCH,
8881                 .attr_count     = NFTA_CHAIN_MAX,
8882                 .policy         = nft_chain_policy,
8883         },
8884         [NFT_MSG_NEWRULE] = {
8885                 .call           = nf_tables_newrule,
8886                 .type           = NFNL_CB_BATCH,
8887                 .attr_count     = NFTA_RULE_MAX,
8888                 .policy         = nft_rule_policy,
8889         },
8890         [NFT_MSG_GETRULE] = {
8891                 .call           = nf_tables_getrule,
8892                 .type           = NFNL_CB_RCU,
8893                 .attr_count     = NFTA_RULE_MAX,
8894                 .policy         = nft_rule_policy,
8895         },
8896         [NFT_MSG_GETRULE_RESET] = {
8897                 .call           = nf_tables_getrule,
8898                 .type           = NFNL_CB_RCU,
8899                 .attr_count     = NFTA_RULE_MAX,
8900                 .policy         = nft_rule_policy,
8901         },
8902         [NFT_MSG_DELRULE] = {
8903                 .call           = nf_tables_delrule,
8904                 .type           = NFNL_CB_BATCH,
8905                 .attr_count     = NFTA_RULE_MAX,
8906                 .policy         = nft_rule_policy,
8907         },
8908         [NFT_MSG_DESTROYRULE] = {
8909                 .call           = nf_tables_delrule,
8910                 .type           = NFNL_CB_BATCH,
8911                 .attr_count     = NFTA_RULE_MAX,
8912                 .policy         = nft_rule_policy,
8913         },
8914         [NFT_MSG_NEWSET] = {
8915                 .call           = nf_tables_newset,
8916                 .type           = NFNL_CB_BATCH,
8917                 .attr_count     = NFTA_SET_MAX,
8918                 .policy         = nft_set_policy,
8919         },
8920         [NFT_MSG_GETSET] = {
8921                 .call           = nf_tables_getset,
8922                 .type           = NFNL_CB_RCU,
8923                 .attr_count     = NFTA_SET_MAX,
8924                 .policy         = nft_set_policy,
8925         },
8926         [NFT_MSG_DELSET] = {
8927                 .call           = nf_tables_delset,
8928                 .type           = NFNL_CB_BATCH,
8929                 .attr_count     = NFTA_SET_MAX,
8930                 .policy         = nft_set_policy,
8931         },
8932         [NFT_MSG_DESTROYSET] = {
8933                 .call           = nf_tables_delset,
8934                 .type           = NFNL_CB_BATCH,
8935                 .attr_count     = NFTA_SET_MAX,
8936                 .policy         = nft_set_policy,
8937         },
8938         [NFT_MSG_NEWSETELEM] = {
8939                 .call           = nf_tables_newsetelem,
8940                 .type           = NFNL_CB_BATCH,
8941                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8942                 .policy         = nft_set_elem_list_policy,
8943         },
8944         [NFT_MSG_GETSETELEM] = {
8945                 .call           = nf_tables_getsetelem,
8946                 .type           = NFNL_CB_RCU,
8947                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8948                 .policy         = nft_set_elem_list_policy,
8949         },
8950         [NFT_MSG_GETSETELEM_RESET] = {
8951                 .call           = nf_tables_getsetelem,
8952                 .type           = NFNL_CB_RCU,
8953                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8954                 .policy         = nft_set_elem_list_policy,
8955         },
8956         [NFT_MSG_DELSETELEM] = {
8957                 .call           = nf_tables_delsetelem,
8958                 .type           = NFNL_CB_BATCH,
8959                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8960                 .policy         = nft_set_elem_list_policy,
8961         },
8962         [NFT_MSG_DESTROYSETELEM] = {
8963                 .call           = nf_tables_delsetelem,
8964                 .type           = NFNL_CB_BATCH,
8965                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8966                 .policy         = nft_set_elem_list_policy,
8967         },
8968         [NFT_MSG_GETGEN] = {
8969                 .call           = nf_tables_getgen,
8970                 .type           = NFNL_CB_RCU,
8971         },
8972         [NFT_MSG_NEWOBJ] = {
8973                 .call           = nf_tables_newobj,
8974                 .type           = NFNL_CB_BATCH,
8975                 .attr_count     = NFTA_OBJ_MAX,
8976                 .policy         = nft_obj_policy,
8977         },
8978         [NFT_MSG_GETOBJ] = {
8979                 .call           = nf_tables_getobj,
8980                 .type           = NFNL_CB_RCU,
8981                 .attr_count     = NFTA_OBJ_MAX,
8982                 .policy         = nft_obj_policy,
8983         },
8984         [NFT_MSG_DELOBJ] = {
8985                 .call           = nf_tables_delobj,
8986                 .type           = NFNL_CB_BATCH,
8987                 .attr_count     = NFTA_OBJ_MAX,
8988                 .policy         = nft_obj_policy,
8989         },
8990         [NFT_MSG_DESTROYOBJ] = {
8991                 .call           = nf_tables_delobj,
8992                 .type           = NFNL_CB_BATCH,
8993                 .attr_count     = NFTA_OBJ_MAX,
8994                 .policy         = nft_obj_policy,
8995         },
8996         [NFT_MSG_GETOBJ_RESET] = {
8997                 .call           = nf_tables_getobj,
8998                 .type           = NFNL_CB_RCU,
8999                 .attr_count     = NFTA_OBJ_MAX,
9000                 .policy         = nft_obj_policy,
9001         },
9002         [NFT_MSG_NEWFLOWTABLE] = {
9003                 .call           = nf_tables_newflowtable,
9004                 .type           = NFNL_CB_BATCH,
9005                 .attr_count     = NFTA_FLOWTABLE_MAX,
9006                 .policy         = nft_flowtable_policy,
9007         },
9008         [NFT_MSG_GETFLOWTABLE] = {
9009                 .call           = nf_tables_getflowtable,
9010                 .type           = NFNL_CB_RCU,
9011                 .attr_count     = NFTA_FLOWTABLE_MAX,
9012                 .policy         = nft_flowtable_policy,
9013         },
9014         [NFT_MSG_DELFLOWTABLE] = {
9015                 .call           = nf_tables_delflowtable,
9016                 .type           = NFNL_CB_BATCH,
9017                 .attr_count     = NFTA_FLOWTABLE_MAX,
9018                 .policy         = nft_flowtable_policy,
9019         },
9020         [NFT_MSG_DESTROYFLOWTABLE] = {
9021                 .call           = nf_tables_delflowtable,
9022                 .type           = NFNL_CB_BATCH,
9023                 .attr_count     = NFTA_FLOWTABLE_MAX,
9024                 .policy         = nft_flowtable_policy,
9025         },
9026 };
9027
9028 static int nf_tables_validate(struct net *net)
9029 {
9030         struct nftables_pernet *nft_net = nft_pernet(net);
9031         struct nft_table *table;
9032
9033         list_for_each_entry(table, &nft_net->tables, list) {
9034                 switch (table->validate_state) {
9035                 case NFT_VALIDATE_SKIP:
9036                         continue;
9037                 case NFT_VALIDATE_NEED:
9038                         nft_validate_state_update(table, NFT_VALIDATE_DO);
9039                         fallthrough;
9040                 case NFT_VALIDATE_DO:
9041                         if (nft_table_validate(net, table) < 0)
9042                                 return -EAGAIN;
9043
9044                         nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9045                 }
9046
9047                 break;
9048         }
9049
9050         return 0;
9051 }
9052
9053 /* a drop policy has to be deferred until all rules have been activated,
9054  * otherwise a large ruleset that contains a drop-policy base chain will
9055  * cause all packets to get dropped until the full transaction has been
9056  * processed.
9057  *
9058  * We defer the drop policy until the transaction has been finalized.
9059  */
9060 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9061 {
9062         struct nft_base_chain *basechain;
9063
9064         if (nft_trans_chain_policy(trans) != NF_DROP)
9065                 return;
9066
9067         if (!nft_is_base_chain(trans->ctx.chain))
9068                 return;
9069
9070         basechain = nft_base_chain(trans->ctx.chain);
9071         basechain->policy = NF_DROP;
9072 }
9073
9074 static void nft_chain_commit_update(struct nft_trans *trans)
9075 {
9076         struct nft_base_chain *basechain;
9077
9078         if (nft_trans_chain_name(trans)) {
9079                 rhltable_remove(&trans->ctx.table->chains_ht,
9080                                 &trans->ctx.chain->rhlhead,
9081                                 nft_chain_ht_params);
9082                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9083                 rhltable_insert_key(&trans->ctx.table->chains_ht,
9084                                     trans->ctx.chain->name,
9085                                     &trans->ctx.chain->rhlhead,
9086                                     nft_chain_ht_params);
9087         }
9088
9089         if (!nft_is_base_chain(trans->ctx.chain))
9090                 return;
9091
9092         nft_chain_stats_replace(trans);
9093
9094         basechain = nft_base_chain(trans->ctx.chain);
9095
9096         switch (nft_trans_chain_policy(trans)) {
9097         case NF_DROP:
9098         case NF_ACCEPT:
9099                 basechain->policy = nft_trans_chain_policy(trans);
9100                 break;
9101         }
9102 }
9103
9104 static void nft_obj_commit_update(struct nft_trans *trans)
9105 {
9106         struct nft_object *newobj;
9107         struct nft_object *obj;
9108
9109         obj = nft_trans_obj(trans);
9110         newobj = nft_trans_obj_newobj(trans);
9111
9112         if (obj->ops->update)
9113                 obj->ops->update(obj, newobj);
9114
9115         nft_obj_destroy(&trans->ctx, newobj);
9116 }
9117
9118 static void nft_commit_release(struct nft_trans *trans)
9119 {
9120         switch (trans->msg_type) {
9121         case NFT_MSG_DELTABLE:
9122         case NFT_MSG_DESTROYTABLE:
9123                 nf_tables_table_destroy(&trans->ctx);
9124                 break;
9125         case NFT_MSG_NEWCHAIN:
9126                 free_percpu(nft_trans_chain_stats(trans));
9127                 kfree(nft_trans_chain_name(trans));
9128                 break;
9129         case NFT_MSG_DELCHAIN:
9130         case NFT_MSG_DESTROYCHAIN:
9131                 if (nft_trans_chain_update(trans))
9132                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9133                 else
9134                         nf_tables_chain_destroy(&trans->ctx);
9135                 break;
9136         case NFT_MSG_DELRULE:
9137         case NFT_MSG_DESTROYRULE:
9138                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9139                 break;
9140         case NFT_MSG_DELSET:
9141         case NFT_MSG_DESTROYSET:
9142                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9143                 break;
9144         case NFT_MSG_DELSETELEM:
9145         case NFT_MSG_DESTROYSETELEM:
9146                 nf_tables_set_elem_destroy(&trans->ctx,
9147                                            nft_trans_elem_set(trans),
9148                                            nft_trans_elem(trans).priv);
9149                 break;
9150         case NFT_MSG_DELOBJ:
9151         case NFT_MSG_DESTROYOBJ:
9152                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9153                 break;
9154         case NFT_MSG_DELFLOWTABLE:
9155         case NFT_MSG_DESTROYFLOWTABLE:
9156                 if (nft_trans_flowtable_update(trans))
9157                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9158                 else
9159                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9160                 break;
9161         }
9162
9163         if (trans->put_net)
9164                 put_net(trans->ctx.net);
9165
9166         kfree(trans);
9167 }
9168
9169 static void nf_tables_trans_destroy_work(struct work_struct *w)
9170 {
9171         struct nft_trans *trans, *next;
9172         LIST_HEAD(head);
9173
9174         spin_lock(&nf_tables_destroy_list_lock);
9175         list_splice_init(&nf_tables_destroy_list, &head);
9176         spin_unlock(&nf_tables_destroy_list_lock);
9177
9178         if (list_empty(&head))
9179                 return;
9180
9181         synchronize_rcu();
9182
9183         list_for_each_entry_safe(trans, next, &head, list) {
9184                 nft_trans_list_del(trans);
9185                 nft_commit_release(trans);
9186         }
9187 }
9188
9189 void nf_tables_trans_destroy_flush_work(void)
9190 {
9191         flush_work(&trans_destroy_work);
9192 }
9193 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9194
9195 static bool nft_expr_reduce(struct nft_regs_track *track,
9196                             const struct nft_expr *expr)
9197 {
9198         return false;
9199 }
9200
9201 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9202 {
9203         const struct nft_expr *expr, *last;
9204         struct nft_regs_track track = {};
9205         unsigned int size, data_size;
9206         void *data, *data_boundary;
9207         struct nft_rule_dp *prule;
9208         struct nft_rule *rule;
9209
9210         /* already handled or inactive chain? */
9211         if (chain->blob_next || !nft_is_active_next(net, chain))
9212                 return 0;
9213
9214         data_size = 0;
9215         list_for_each_entry(rule, &chain->rules, list) {
9216                 if (nft_is_active_next(net, rule)) {
9217                         data_size += sizeof(*prule) + rule->dlen;
9218                         if (data_size > INT_MAX)
9219                                 return -ENOMEM;
9220                 }
9221         }
9222
9223         chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9224         if (!chain->blob_next)
9225                 return -ENOMEM;
9226
9227         data = (void *)chain->blob_next->data;
9228         data_boundary = data + data_size;
9229         size = 0;
9230
9231         list_for_each_entry(rule, &chain->rules, list) {
9232                 if (!nft_is_active_next(net, rule))
9233                         continue;
9234
9235                 prule = (struct nft_rule_dp *)data;
9236                 data += offsetof(struct nft_rule_dp, data);
9237                 if (WARN_ON_ONCE(data > data_boundary))
9238                         return -ENOMEM;
9239
9240                 size = 0;
9241                 track.last = nft_expr_last(rule);
9242                 nft_rule_for_each_expr(expr, last, rule) {
9243                         track.cur = expr;
9244
9245                         if (nft_expr_reduce(&track, expr)) {
9246                                 expr = track.cur;
9247                                 continue;
9248                         }
9249
9250                         if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9251                                 return -ENOMEM;
9252
9253                         memcpy(data + size, expr, expr->ops->size);
9254                         size += expr->ops->size;
9255                 }
9256                 if (WARN_ON_ONCE(size >= 1 << 12))
9257                         return -ENOMEM;
9258
9259                 prule->handle = rule->handle;
9260                 prule->dlen = size;
9261                 prule->is_last = 0;
9262
9263                 data += size;
9264                 size = 0;
9265                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9266         }
9267
9268         if (WARN_ON_ONCE(data > data_boundary))
9269                 return -ENOMEM;
9270
9271         prule = (struct nft_rule_dp *)data;
9272         nft_last_rule(chain, prule);
9273
9274         return 0;
9275 }
9276
9277 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9278 {
9279         struct nftables_pernet *nft_net = nft_pernet(net);
9280         struct nft_trans *trans, *next;
9281
9282         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9283                 struct nft_chain *chain = trans->ctx.chain;
9284
9285                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9286                     trans->msg_type == NFT_MSG_DELRULE) {
9287                         kvfree(chain->blob_next);
9288                         chain->blob_next = NULL;
9289                 }
9290         }
9291 }
9292
9293 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9294 {
9295         struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9296
9297         kvfree(l->blob);
9298 }
9299
9300 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9301 {
9302         struct nft_rule_dp_last *last;
9303
9304         /* last rule trailer is after end marker */
9305         last = (void *)blob + sizeof(*blob) + blob->size;
9306         last->blob = blob;
9307
9308         call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9309 }
9310
9311 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9312 {
9313         struct nft_rule_blob *g0, *g1;
9314         bool next_genbit;
9315
9316         next_genbit = nft_gencursor_next(net);
9317
9318         g0 = rcu_dereference_protected(chain->blob_gen_0,
9319                                        lockdep_commit_lock_is_held(net));
9320         g1 = rcu_dereference_protected(chain->blob_gen_1,
9321                                        lockdep_commit_lock_is_held(net));
9322
9323         /* No changes to this chain? */
9324         if (chain->blob_next == NULL) {
9325                 /* chain had no change in last or next generation */
9326                 if (g0 == g1)
9327                         return;
9328                 /*
9329                  * chain had no change in this generation; make sure next
9330                  * one uses same rules as current generation.
9331                  */
9332                 if (next_genbit) {
9333                         rcu_assign_pointer(chain->blob_gen_1, g0);
9334                         nf_tables_commit_chain_free_rules_old(g1);
9335                 } else {
9336                         rcu_assign_pointer(chain->blob_gen_0, g1);
9337                         nf_tables_commit_chain_free_rules_old(g0);
9338                 }
9339
9340                 return;
9341         }
9342
9343         if (next_genbit)
9344                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9345         else
9346                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9347
9348         chain->blob_next = NULL;
9349
9350         if (g0 == g1)
9351                 return;
9352
9353         if (next_genbit)
9354                 nf_tables_commit_chain_free_rules_old(g1);
9355         else
9356                 nf_tables_commit_chain_free_rules_old(g0);
9357 }
9358
9359 static void nft_obj_del(struct nft_object *obj)
9360 {
9361         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9362         list_del_rcu(&obj->list);
9363 }
9364
9365 void nft_chain_del(struct nft_chain *chain)
9366 {
9367         struct nft_table *table = chain->table;
9368
9369         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9370                                      nft_chain_ht_params));
9371         list_del_rcu(&chain->list);
9372 }
9373
9374 static void nf_tables_module_autoload_cleanup(struct net *net)
9375 {
9376         struct nftables_pernet *nft_net = nft_pernet(net);
9377         struct nft_module_request *req, *next;
9378
9379         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9380         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9381                 WARN_ON_ONCE(!req->done);
9382                 list_del(&req->list);
9383                 kfree(req);
9384         }
9385 }
9386
9387 static void nf_tables_commit_release(struct net *net)
9388 {
9389         struct nftables_pernet *nft_net = nft_pernet(net);
9390         struct nft_trans *trans;
9391
9392         /* all side effects have to be made visible.
9393          * For example, if a chain named 'foo' has been deleted, a
9394          * new transaction must not find it anymore.
9395          *
9396          * Memory reclaim happens asynchronously from work queue
9397          * to prevent expensive synchronize_rcu() in commit phase.
9398          */
9399         if (list_empty(&nft_net->commit_list)) {
9400                 nf_tables_module_autoload_cleanup(net);
9401                 mutex_unlock(&nft_net->commit_mutex);
9402                 return;
9403         }
9404
9405         trans = list_last_entry(&nft_net->commit_list,
9406                                 struct nft_trans, list);
9407         get_net(trans->ctx.net);
9408         WARN_ON_ONCE(trans->put_net);
9409
9410         trans->put_net = true;
9411         spin_lock(&nf_tables_destroy_list_lock);
9412         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9413         spin_unlock(&nf_tables_destroy_list_lock);
9414
9415         nf_tables_module_autoload_cleanup(net);
9416         schedule_work(&trans_destroy_work);
9417
9418         mutex_unlock(&nft_net->commit_mutex);
9419 }
9420
9421 static void nft_commit_notify(struct net *net, u32 portid)
9422 {
9423         struct nftables_pernet *nft_net = nft_pernet(net);
9424         struct sk_buff *batch_skb = NULL, *nskb, *skb;
9425         unsigned char *data;
9426         int len;
9427
9428         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9429                 if (!batch_skb) {
9430 new_batch:
9431                         batch_skb = skb;
9432                         len = NLMSG_GOODSIZE - skb->len;
9433                         list_del(&skb->list);
9434                         continue;
9435                 }
9436                 len -= skb->len;
9437                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9438                         data = skb_put(batch_skb, skb->len);
9439                         memcpy(data, skb->data, skb->len);
9440                         list_del(&skb->list);
9441                         kfree_skb(skb);
9442                         continue;
9443                 }
9444                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9445                                NFT_CB(batch_skb).report, GFP_KERNEL);
9446                 goto new_batch;
9447         }
9448
9449         if (batch_skb) {
9450                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9451                                NFT_CB(batch_skb).report, GFP_KERNEL);
9452         }
9453
9454         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9455 }
9456
9457 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9458                                         struct nft_table *table)
9459 {
9460         struct nft_audit_data *adp;
9461
9462         list_for_each_entry(adp, adl, list) {
9463                 if (adp->table == table)
9464                         return 0;
9465         }
9466         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9467         if (!adp)
9468                 return -ENOMEM;
9469         adp->table = table;
9470         list_add(&adp->list, adl);
9471         return 0;
9472 }
9473
9474 static void nf_tables_commit_audit_free(struct list_head *adl)
9475 {
9476         struct nft_audit_data *adp, *adn;
9477
9478         list_for_each_entry_safe(adp, adn, adl, list) {
9479                 list_del(&adp->list);
9480                 kfree(adp);
9481         }
9482 }
9483
9484 static void nf_tables_commit_audit_collect(struct list_head *adl,
9485                                            struct nft_table *table, u32 op)
9486 {
9487         struct nft_audit_data *adp;
9488
9489         list_for_each_entry(adp, adl, list) {
9490                 if (adp->table == table)
9491                         goto found;
9492         }
9493         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9494         return;
9495 found:
9496         adp->entries++;
9497         if (!adp->op || adp->op > op)
9498                 adp->op = op;
9499 }
9500
9501 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9502
9503 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9504 {
9505         struct nft_audit_data *adp, *adn;
9506         char aubuf[AUNFTABLENAMELEN];
9507
9508         list_for_each_entry_safe(adp, adn, adl, list) {
9509                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9510                          generation);
9511                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9512                                 nft2audit_op[adp->op], GFP_KERNEL);
9513                 list_del(&adp->list);
9514                 kfree(adp);
9515         }
9516 }
9517
9518 static void nft_set_commit_update(struct list_head *set_update_list)
9519 {
9520         struct nft_set *set, *next;
9521
9522         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9523                 list_del_init(&set->pending_update);
9524
9525                 if (!set->ops->commit)
9526                         continue;
9527
9528                 set->ops->commit(set);
9529         }
9530 }
9531
9532 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9533 {
9534         struct nftables_pernet *nft_net = nft_pernet(net);
9535         struct nft_trans *trans, *next;
9536         LIST_HEAD(set_update_list);
9537         struct nft_trans_elem *te;
9538         struct nft_chain *chain;
9539         struct nft_table *table;
9540         unsigned int base_seq;
9541         LIST_HEAD(adl);
9542         int err;
9543
9544         if (list_empty(&nft_net->commit_list)) {
9545                 mutex_unlock(&nft_net->commit_mutex);
9546                 return 0;
9547         }
9548
9549         list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
9550                 switch (trans->msg_type) {
9551                 case NFT_MSG_NEWSET:
9552                         if (!nft_trans_set_update(trans) &&
9553                             nft_set_is_anonymous(nft_trans_set(trans)) &&
9554                             !nft_trans_set_bound(trans)) {
9555                                 pr_warn_once("nftables ruleset with unbound set\n");
9556                                 return -EINVAL;
9557                         }
9558                         break;
9559                 case NFT_MSG_NEWCHAIN:
9560                         if (!nft_trans_chain_update(trans) &&
9561                             nft_chain_binding(nft_trans_chain(trans)) &&
9562                             !nft_trans_chain_bound(trans)) {
9563                                 pr_warn_once("nftables ruleset with unbound chain\n");
9564                                 return -EINVAL;
9565                         }
9566                         break;
9567                 }
9568         }
9569
9570         /* 0. Validate ruleset, otherwise roll back for error reporting. */
9571         if (nf_tables_validate(net) < 0)
9572                 return -EAGAIN;
9573
9574         err = nft_flow_rule_offload_commit(net);
9575         if (err < 0)
9576                 return err;
9577
9578         /* 1.  Allocate space for next generation rules_gen_X[] */
9579         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9580                 int ret;
9581
9582                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9583                 if (ret) {
9584                         nf_tables_commit_chain_prepare_cancel(net);
9585                         nf_tables_commit_audit_free(&adl);
9586                         return ret;
9587                 }
9588                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9589                     trans->msg_type == NFT_MSG_DELRULE) {
9590                         chain = trans->ctx.chain;
9591
9592                         ret = nf_tables_commit_chain_prepare(net, chain);
9593                         if (ret < 0) {
9594                                 nf_tables_commit_chain_prepare_cancel(net);
9595                                 nf_tables_commit_audit_free(&adl);
9596                                 return ret;
9597                         }
9598                 }
9599         }
9600
9601         /* step 2.  Make rules_gen_X visible to packet path */
9602         list_for_each_entry(table, &nft_net->tables, list) {
9603                 list_for_each_entry(chain, &table->chains, list)
9604                         nf_tables_commit_chain(net, chain);
9605         }
9606
9607         /*
9608          * Bump generation counter, invalidate any dump in progress.
9609          * Cannot fail after this point.
9610          */
9611         base_seq = READ_ONCE(nft_net->base_seq);
9612         while (++base_seq == 0)
9613                 ;
9614
9615         WRITE_ONCE(nft_net->base_seq, base_seq);
9616
9617         /* step 3. Start new generation, rules_gen_X now in use. */
9618         net->nft.gencursor = nft_gencursor_next(net);
9619
9620         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9621                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9622                                                trans->msg_type);
9623                 switch (trans->msg_type) {
9624                 case NFT_MSG_NEWTABLE:
9625                         if (nft_trans_table_update(trans)) {
9626                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9627                                         nft_trans_destroy(trans);
9628                                         break;
9629                                 }
9630                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9631                                         nf_tables_table_disable(net, trans->ctx.table);
9632
9633                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9634                         } else {
9635                                 nft_clear(net, trans->ctx.table);
9636                         }
9637                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
9638                         nft_trans_destroy(trans);
9639                         break;
9640                 case NFT_MSG_DELTABLE:
9641                 case NFT_MSG_DESTROYTABLE:
9642                         list_del_rcu(&trans->ctx.table->list);
9643                         nf_tables_table_notify(&trans->ctx, trans->msg_type);
9644                         break;
9645                 case NFT_MSG_NEWCHAIN:
9646                         if (nft_trans_chain_update(trans)) {
9647                                 nft_chain_commit_update(trans);
9648                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
9649                                                        &nft_trans_chain_hooks(trans));
9650                                 list_splice(&nft_trans_chain_hooks(trans),
9651                                             &nft_trans_basechain(trans)->hook_list);
9652                                 /* trans destroyed after rcu grace period */
9653                         } else {
9654                                 nft_chain_commit_drop_policy(trans);
9655                                 nft_clear(net, trans->ctx.chain);
9656                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
9657                                 nft_trans_destroy(trans);
9658                         }
9659                         break;
9660                 case NFT_MSG_DELCHAIN:
9661                 case NFT_MSG_DESTROYCHAIN:
9662                         if (nft_trans_chain_update(trans)) {
9663                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9664                                                        &nft_trans_chain_hooks(trans));
9665                                 nft_netdev_unregister_hooks(net,
9666                                                             &nft_trans_chain_hooks(trans),
9667                                                             true);
9668                         } else {
9669                                 nft_chain_del(trans->ctx.chain);
9670                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9671                                                        NULL);
9672                                 nf_tables_unregister_hook(trans->ctx.net,
9673                                                           trans->ctx.table,
9674                                                           trans->ctx.chain);
9675                         }
9676                         break;
9677                 case NFT_MSG_NEWRULE:
9678                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9679                         nf_tables_rule_notify(&trans->ctx,
9680                                               nft_trans_rule(trans),
9681                                               NFT_MSG_NEWRULE);
9682                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9683                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9684
9685                         nft_trans_destroy(trans);
9686                         break;
9687                 case NFT_MSG_DELRULE:
9688                 case NFT_MSG_DESTROYRULE:
9689                         list_del_rcu(&nft_trans_rule(trans)->list);
9690                         nf_tables_rule_notify(&trans->ctx,
9691                                               nft_trans_rule(trans),
9692                                               trans->msg_type);
9693                         nft_rule_expr_deactivate(&trans->ctx,
9694                                                  nft_trans_rule(trans),
9695                                                  NFT_TRANS_COMMIT);
9696
9697                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9698                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9699                         break;
9700                 case NFT_MSG_NEWSET:
9701                         if (nft_trans_set_update(trans)) {
9702                                 struct nft_set *set = nft_trans_set(trans);
9703
9704                                 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
9705                                 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
9706
9707                                 if (nft_trans_set_size(trans))
9708                                         WRITE_ONCE(set->size, nft_trans_set_size(trans));
9709                         } else {
9710                                 nft_clear(net, nft_trans_set(trans));
9711                                 /* This avoids hitting -EBUSY when deleting the table
9712                                  * from the transaction.
9713                                  */
9714                                 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
9715                                     !list_empty(&nft_trans_set(trans)->bindings))
9716                                         trans->ctx.table->use--;
9717                         }
9718                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9719                                              NFT_MSG_NEWSET, GFP_KERNEL);
9720                         nft_trans_destroy(trans);
9721                         break;
9722                 case NFT_MSG_DELSET:
9723                 case NFT_MSG_DESTROYSET:
9724                         list_del_rcu(&nft_trans_set(trans)->list);
9725                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9726                                              trans->msg_type, GFP_KERNEL);
9727                         break;
9728                 case NFT_MSG_NEWSETELEM:
9729                         te = (struct nft_trans_elem *)trans->data;
9730
9731                         nft_setelem_activate(net, te->set, &te->elem);
9732                         nf_tables_setelem_notify(&trans->ctx, te->set,
9733                                                  &te->elem,
9734                                                  NFT_MSG_NEWSETELEM);
9735                         if (te->set->ops->commit &&
9736                             list_empty(&te->set->pending_update)) {
9737                                 list_add_tail(&te->set->pending_update,
9738                                               &set_update_list);
9739                         }
9740                         nft_trans_destroy(trans);
9741                         break;
9742                 case NFT_MSG_DELSETELEM:
9743                 case NFT_MSG_DESTROYSETELEM:
9744                         te = (struct nft_trans_elem *)trans->data;
9745
9746                         nf_tables_setelem_notify(&trans->ctx, te->set,
9747                                                  &te->elem,
9748                                                  trans->msg_type);
9749                         nft_setelem_remove(net, te->set, &te->elem);
9750                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
9751                                 atomic_dec(&te->set->nelems);
9752                                 te->set->ndeact--;
9753                         }
9754                         if (te->set->ops->commit &&
9755                             list_empty(&te->set->pending_update)) {
9756                                 list_add_tail(&te->set->pending_update,
9757                                               &set_update_list);
9758                         }
9759                         break;
9760                 case NFT_MSG_NEWOBJ:
9761                         if (nft_trans_obj_update(trans)) {
9762                                 nft_obj_commit_update(trans);
9763                                 nf_tables_obj_notify(&trans->ctx,
9764                                                      nft_trans_obj(trans),
9765                                                      NFT_MSG_NEWOBJ);
9766                         } else {
9767                                 nft_clear(net, nft_trans_obj(trans));
9768                                 nf_tables_obj_notify(&trans->ctx,
9769                                                      nft_trans_obj(trans),
9770                                                      NFT_MSG_NEWOBJ);
9771                                 nft_trans_destroy(trans);
9772                         }
9773                         break;
9774                 case NFT_MSG_DELOBJ:
9775                 case NFT_MSG_DESTROYOBJ:
9776                         nft_obj_del(nft_trans_obj(trans));
9777                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
9778                                              trans->msg_type);
9779                         break;
9780                 case NFT_MSG_NEWFLOWTABLE:
9781                         if (nft_trans_flowtable_update(trans)) {
9782                                 nft_trans_flowtable(trans)->data.flags =
9783                                         nft_trans_flowtable_flags(trans);
9784                                 nf_tables_flowtable_notify(&trans->ctx,
9785                                                            nft_trans_flowtable(trans),
9786                                                            &nft_trans_flowtable_hooks(trans),
9787                                                            NFT_MSG_NEWFLOWTABLE);
9788                                 list_splice(&nft_trans_flowtable_hooks(trans),
9789                                             &nft_trans_flowtable(trans)->hook_list);
9790                         } else {
9791                                 nft_clear(net, nft_trans_flowtable(trans));
9792                                 nf_tables_flowtable_notify(&trans->ctx,
9793                                                            nft_trans_flowtable(trans),
9794                                                            NULL,
9795                                                            NFT_MSG_NEWFLOWTABLE);
9796                         }
9797                         nft_trans_destroy(trans);
9798                         break;
9799                 case NFT_MSG_DELFLOWTABLE:
9800                 case NFT_MSG_DESTROYFLOWTABLE:
9801                         if (nft_trans_flowtable_update(trans)) {
9802                                 nf_tables_flowtable_notify(&trans->ctx,
9803                                                            nft_trans_flowtable(trans),
9804                                                            &nft_trans_flowtable_hooks(trans),
9805                                                            trans->msg_type);
9806                                 nft_unregister_flowtable_net_hooks(net,
9807                                                                    &nft_trans_flowtable_hooks(trans));
9808                         } else {
9809                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9810                                 nf_tables_flowtable_notify(&trans->ctx,
9811                                                            nft_trans_flowtable(trans),
9812                                                            NULL,
9813                                                            trans->msg_type);
9814                                 nft_unregister_flowtable_net_hooks(net,
9815                                                 &nft_trans_flowtable(trans)->hook_list);
9816                         }
9817                         break;
9818                 }
9819         }
9820
9821         nft_set_commit_update(&set_update_list);
9822
9823         nft_commit_notify(net, NETLINK_CB(skb).portid);
9824         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
9825         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
9826         nf_tables_commit_release(net);
9827
9828         return 0;
9829 }
9830
9831 static void nf_tables_module_autoload(struct net *net)
9832 {
9833         struct nftables_pernet *nft_net = nft_pernet(net);
9834         struct nft_module_request *req, *next;
9835         LIST_HEAD(module_list);
9836
9837         list_splice_init(&nft_net->module_list, &module_list);
9838         mutex_unlock(&nft_net->commit_mutex);
9839         list_for_each_entry_safe(req, next, &module_list, list) {
9840                 request_module("%s", req->module);
9841                 req->done = true;
9842         }
9843         mutex_lock(&nft_net->commit_mutex);
9844         list_splice(&module_list, &nft_net->module_list);
9845 }
9846
9847 static void nf_tables_abort_release(struct nft_trans *trans)
9848 {
9849         switch (trans->msg_type) {
9850         case NFT_MSG_NEWTABLE:
9851                 nf_tables_table_destroy(&trans->ctx);
9852                 break;
9853         case NFT_MSG_NEWCHAIN:
9854                 if (nft_trans_chain_update(trans))
9855                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9856                 else
9857                         nf_tables_chain_destroy(&trans->ctx);
9858                 break;
9859         case NFT_MSG_NEWRULE:
9860                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9861                 break;
9862         case NFT_MSG_NEWSET:
9863                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9864                 break;
9865         case NFT_MSG_NEWSETELEM:
9866                 nft_set_elem_destroy(nft_trans_elem_set(trans),
9867                                      nft_trans_elem(trans).priv, true);
9868                 break;
9869         case NFT_MSG_NEWOBJ:
9870                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9871                 break;
9872         case NFT_MSG_NEWFLOWTABLE:
9873                 if (nft_trans_flowtable_update(trans))
9874                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9875                 else
9876                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9877                 break;
9878         }
9879         kfree(trans);
9880 }
9881
9882 static void nft_set_abort_update(struct list_head *set_update_list)
9883 {
9884         struct nft_set *set, *next;
9885
9886         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9887                 list_del_init(&set->pending_update);
9888
9889                 if (!set->ops->abort)
9890                         continue;
9891
9892                 set->ops->abort(set);
9893         }
9894 }
9895
9896 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9897 {
9898         struct nftables_pernet *nft_net = nft_pernet(net);
9899         struct nft_trans *trans, *next;
9900         LIST_HEAD(set_update_list);
9901         struct nft_trans_elem *te;
9902
9903         if (action == NFNL_ABORT_VALIDATE &&
9904             nf_tables_validate(net) < 0)
9905                 return -EAGAIN;
9906
9907         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9908                                          list) {
9909                 switch (trans->msg_type) {
9910                 case NFT_MSG_NEWTABLE:
9911                         if (nft_trans_table_update(trans)) {
9912                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9913                                         nft_trans_destroy(trans);
9914                                         break;
9915                                 }
9916                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9917                                         nf_tables_table_disable(net, trans->ctx.table);
9918                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9919                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9920                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9921                                 }
9922                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9923                                 nft_trans_destroy(trans);
9924                         } else {
9925                                 list_del_rcu(&trans->ctx.table->list);
9926                         }
9927                         break;
9928                 case NFT_MSG_DELTABLE:
9929                 case NFT_MSG_DESTROYTABLE:
9930                         nft_clear(trans->ctx.net, trans->ctx.table);
9931                         nft_trans_destroy(trans);
9932                         break;
9933                 case NFT_MSG_NEWCHAIN:
9934                         if (nft_trans_chain_update(trans)) {
9935                                 nft_netdev_unregister_hooks(net,
9936                                                             &nft_trans_chain_hooks(trans),
9937                                                             true);
9938                                 free_percpu(nft_trans_chain_stats(trans));
9939                                 kfree(nft_trans_chain_name(trans));
9940                                 nft_trans_destroy(trans);
9941                         } else {
9942                                 if (nft_trans_chain_bound(trans)) {
9943                                         nft_trans_destroy(trans);
9944                                         break;
9945                                 }
9946                                 trans->ctx.table->use--;
9947                                 nft_chain_del(trans->ctx.chain);
9948                                 nf_tables_unregister_hook(trans->ctx.net,
9949                                                           trans->ctx.table,
9950                                                           trans->ctx.chain);
9951                         }
9952                         break;
9953                 case NFT_MSG_DELCHAIN:
9954                 case NFT_MSG_DESTROYCHAIN:
9955                         if (nft_trans_chain_update(trans)) {
9956                                 list_splice(&nft_trans_chain_hooks(trans),
9957                                             &nft_trans_basechain(trans)->hook_list);
9958                         } else {
9959                                 trans->ctx.table->use++;
9960                                 nft_clear(trans->ctx.net, trans->ctx.chain);
9961                         }
9962                         nft_trans_destroy(trans);
9963                         break;
9964                 case NFT_MSG_NEWRULE:
9965                         if (nft_trans_rule_bound(trans)) {
9966                                 nft_trans_destroy(trans);
9967                                 break;
9968                         }
9969                         trans->ctx.chain->use--;
9970                         list_del_rcu(&nft_trans_rule(trans)->list);
9971                         nft_rule_expr_deactivate(&trans->ctx,
9972                                                  nft_trans_rule(trans),
9973                                                  NFT_TRANS_ABORT);
9974                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9975                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9976                         break;
9977                 case NFT_MSG_DELRULE:
9978                 case NFT_MSG_DESTROYRULE:
9979                         trans->ctx.chain->use++;
9980                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9981                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9982                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9983                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9984
9985                         nft_trans_destroy(trans);
9986                         break;
9987                 case NFT_MSG_NEWSET:
9988                         if (nft_trans_set_update(trans)) {
9989                                 nft_trans_destroy(trans);
9990                                 break;
9991                         }
9992                         trans->ctx.table->use--;
9993                         if (nft_trans_set_bound(trans)) {
9994                                 nft_trans_destroy(trans);
9995                                 break;
9996                         }
9997                         list_del_rcu(&nft_trans_set(trans)->list);
9998                         break;
9999                 case NFT_MSG_DELSET:
10000                 case NFT_MSG_DESTROYSET:
10001                         trans->ctx.table->use++;
10002                         nft_clear(trans->ctx.net, nft_trans_set(trans));
10003                         if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10004                                 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10005
10006                         nft_trans_destroy(trans);
10007                         break;
10008                 case NFT_MSG_NEWSETELEM:
10009                         if (nft_trans_elem_set_bound(trans)) {
10010                                 nft_trans_destroy(trans);
10011                                 break;
10012                         }
10013                         te = (struct nft_trans_elem *)trans->data;
10014                         nft_setelem_remove(net, te->set, &te->elem);
10015                         if (!nft_setelem_is_catchall(te->set, &te->elem))
10016                                 atomic_dec(&te->set->nelems);
10017
10018                         if (te->set->ops->abort &&
10019                             list_empty(&te->set->pending_update)) {
10020                                 list_add_tail(&te->set->pending_update,
10021                                               &set_update_list);
10022                         }
10023                         break;
10024                 case NFT_MSG_DELSETELEM:
10025                 case NFT_MSG_DESTROYSETELEM:
10026                         te = (struct nft_trans_elem *)trans->data;
10027
10028                         nft_setelem_data_activate(net, te->set, &te->elem);
10029                         nft_setelem_activate(net, te->set, &te->elem);
10030                         if (!nft_setelem_is_catchall(te->set, &te->elem))
10031                                 te->set->ndeact--;
10032
10033                         if (te->set->ops->abort &&
10034                             list_empty(&te->set->pending_update)) {
10035                                 list_add_tail(&te->set->pending_update,
10036                                               &set_update_list);
10037                         }
10038                         nft_trans_destroy(trans);
10039                         break;
10040                 case NFT_MSG_NEWOBJ:
10041                         if (nft_trans_obj_update(trans)) {
10042                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10043                                 nft_trans_destroy(trans);
10044                         } else {
10045                                 trans->ctx.table->use--;
10046                                 nft_obj_del(nft_trans_obj(trans));
10047                         }
10048                         break;
10049                 case NFT_MSG_DELOBJ:
10050                 case NFT_MSG_DESTROYOBJ:
10051                         trans->ctx.table->use++;
10052                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
10053                         nft_trans_destroy(trans);
10054                         break;
10055                 case NFT_MSG_NEWFLOWTABLE:
10056                         if (nft_trans_flowtable_update(trans)) {
10057                                 nft_unregister_flowtable_net_hooks(net,
10058                                                 &nft_trans_flowtable_hooks(trans));
10059                         } else {
10060                                 trans->ctx.table->use--;
10061                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10062                                 nft_unregister_flowtable_net_hooks(net,
10063                                                 &nft_trans_flowtable(trans)->hook_list);
10064                         }
10065                         break;
10066                 case NFT_MSG_DELFLOWTABLE:
10067                 case NFT_MSG_DESTROYFLOWTABLE:
10068                         if (nft_trans_flowtable_update(trans)) {
10069                                 list_splice(&nft_trans_flowtable_hooks(trans),
10070                                             &nft_trans_flowtable(trans)->hook_list);
10071                         } else {
10072                                 trans->ctx.table->use++;
10073                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10074                         }
10075                         nft_trans_destroy(trans);
10076                         break;
10077                 }
10078         }
10079
10080         nft_set_abort_update(&set_update_list);
10081
10082         synchronize_rcu();
10083
10084         list_for_each_entry_safe_reverse(trans, next,
10085                                          &nft_net->commit_list, list) {
10086                 nft_trans_list_del(trans);
10087                 nf_tables_abort_release(trans);
10088         }
10089
10090         if (action == NFNL_ABORT_AUTOLOAD)
10091                 nf_tables_module_autoload(net);
10092         else
10093                 nf_tables_module_autoload_cleanup(net);
10094
10095         return 0;
10096 }
10097
10098 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10099                            enum nfnl_abort_action action)
10100 {
10101         struct nftables_pernet *nft_net = nft_pernet(net);
10102         int ret = __nf_tables_abort(net, action);
10103
10104         mutex_unlock(&nft_net->commit_mutex);
10105
10106         return ret;
10107 }
10108
10109 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10110 {
10111         struct nftables_pernet *nft_net = nft_pernet(net);
10112         bool genid_ok;
10113
10114         mutex_lock(&nft_net->commit_mutex);
10115
10116         genid_ok = genid == 0 || nft_net->base_seq == genid;
10117         if (!genid_ok)
10118                 mutex_unlock(&nft_net->commit_mutex);
10119
10120         /* else, commit mutex has to be released by commit or abort function */
10121         return genid_ok;
10122 }
10123
10124 static const struct nfnetlink_subsystem nf_tables_subsys = {
10125         .name           = "nf_tables",
10126         .subsys_id      = NFNL_SUBSYS_NFTABLES,
10127         .cb_count       = NFT_MSG_MAX,
10128         .cb             = nf_tables_cb,
10129         .commit         = nf_tables_commit,
10130         .abort          = nf_tables_abort,
10131         .valid_genid    = nf_tables_valid_genid,
10132         .owner          = THIS_MODULE,
10133 };
10134
10135 int nft_chain_validate_dependency(const struct nft_chain *chain,
10136                                   enum nft_chain_types type)
10137 {
10138         const struct nft_base_chain *basechain;
10139
10140         if (nft_is_base_chain(chain)) {
10141                 basechain = nft_base_chain(chain);
10142                 if (basechain->type->type != type)
10143                         return -EOPNOTSUPP;
10144         }
10145         return 0;
10146 }
10147 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10148
10149 int nft_chain_validate_hooks(const struct nft_chain *chain,
10150                              unsigned int hook_flags)
10151 {
10152         struct nft_base_chain *basechain;
10153
10154         if (nft_is_base_chain(chain)) {
10155                 basechain = nft_base_chain(chain);
10156
10157                 if ((1 << basechain->ops.hooknum) & hook_flags)
10158                         return 0;
10159
10160                 return -EOPNOTSUPP;
10161         }
10162
10163         return 0;
10164 }
10165 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10166
10167 /*
10168  * Loop detection - walk through the ruleset beginning at the destination chain
10169  * of a new jump until either the source chain is reached (loop) or all
10170  * reachable chains have been traversed.
10171  *
10172  * The loop check is performed whenever a new jump verdict is added to an
10173  * expression or verdict map or a verdict map is bound to a new chain.
10174  */
10175
10176 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10177                                  const struct nft_chain *chain);
10178
10179 static int nft_check_loops(const struct nft_ctx *ctx,
10180                            const struct nft_set_ext *ext)
10181 {
10182         const struct nft_data *data;
10183         int ret;
10184
10185         data = nft_set_ext_data(ext);
10186         switch (data->verdict.code) {
10187         case NFT_JUMP:
10188         case NFT_GOTO:
10189                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10190                 break;
10191         default:
10192                 ret = 0;
10193                 break;
10194         }
10195
10196         return ret;
10197 }
10198
10199 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10200                                         struct nft_set *set,
10201                                         const struct nft_set_iter *iter,
10202                                         struct nft_set_elem *elem)
10203 {
10204         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
10205
10206         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10207             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10208                 return 0;
10209
10210         return nft_check_loops(ctx, ext);
10211 }
10212
10213 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10214                                   struct nft_set *set)
10215 {
10216         u8 genmask = nft_genmask_next(ctx->net);
10217         struct nft_set_elem_catchall *catchall;
10218         struct nft_set_ext *ext;
10219         int ret = 0;
10220
10221         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10222                 ext = nft_set_elem_ext(set, catchall->elem);
10223                 if (!nft_set_elem_active(ext, genmask))
10224                         continue;
10225
10226                 ret = nft_check_loops(ctx, ext);
10227                 if (ret < 0)
10228                         return ret;
10229         }
10230
10231         return ret;
10232 }
10233
10234 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10235                                  const struct nft_chain *chain)
10236 {
10237         const struct nft_rule *rule;
10238         const struct nft_expr *expr, *last;
10239         struct nft_set *set;
10240         struct nft_set_binding *binding;
10241         struct nft_set_iter iter;
10242
10243         if (ctx->chain == chain)
10244                 return -ELOOP;
10245
10246         list_for_each_entry(rule, &chain->rules, list) {
10247                 nft_rule_for_each_expr(expr, last, rule) {
10248                         struct nft_immediate_expr *priv;
10249                         const struct nft_data *data;
10250                         int err;
10251
10252                         if (strcmp(expr->ops->type->name, "immediate"))
10253                                 continue;
10254
10255                         priv = nft_expr_priv(expr);
10256                         if (priv->dreg != NFT_REG_VERDICT)
10257                                 continue;
10258
10259                         data = &priv->data;
10260                         switch (data->verdict.code) {
10261                         case NFT_JUMP:
10262                         case NFT_GOTO:
10263                                 err = nf_tables_check_loops(ctx,
10264                                                         data->verdict.chain);
10265                                 if (err < 0)
10266                                         return err;
10267                                 break;
10268                         default:
10269                                 break;
10270                         }
10271                 }
10272         }
10273
10274         list_for_each_entry(set, &ctx->table->sets, list) {
10275                 if (!nft_is_active_next(ctx->net, set))
10276                         continue;
10277                 if (!(set->flags & NFT_SET_MAP) ||
10278                     set->dtype != NFT_DATA_VERDICT)
10279                         continue;
10280
10281                 list_for_each_entry(binding, &set->bindings, list) {
10282                         if (!(binding->flags & NFT_SET_MAP) ||
10283                             binding->chain != chain)
10284                                 continue;
10285
10286                         iter.genmask    = nft_genmask_next(ctx->net);
10287                         iter.skip       = 0;
10288                         iter.count      = 0;
10289                         iter.err        = 0;
10290                         iter.fn         = nf_tables_loop_check_setelem;
10291
10292                         set->ops->walk(ctx, set, &iter);
10293                         if (!iter.err)
10294                                 iter.err = nft_set_catchall_loops(ctx, set);
10295
10296                         if (iter.err < 0)
10297                                 return iter.err;
10298                 }
10299         }
10300
10301         return 0;
10302 }
10303
10304 /**
10305  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
10306  *
10307  *      @attr: netlink attribute to fetch value from
10308  *      @max: maximum value to be stored in dest
10309  *      @dest: pointer to the variable
10310  *
10311  *      Parse, check and store a given u32 netlink attribute into variable.
10312  *      This function returns -ERANGE if the value goes over maximum value.
10313  *      Otherwise a 0 is returned and the attribute value is stored in the
10314  *      destination variable.
10315  */
10316 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10317 {
10318         u32 val;
10319
10320         val = ntohl(nla_get_be32(attr));
10321         if (val > max)
10322                 return -ERANGE;
10323
10324         *dest = val;
10325         return 0;
10326 }
10327 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10328
10329 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10330 {
10331         unsigned int reg;
10332
10333         reg = ntohl(nla_get_be32(attr));
10334         switch (reg) {
10335         case NFT_REG_VERDICT...NFT_REG_4:
10336                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10337                 break;
10338         case NFT_REG32_00...NFT_REG32_15:
10339                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10340                 break;
10341         default:
10342                 return -ERANGE;
10343         }
10344
10345         return 0;
10346 }
10347
10348 /**
10349  *      nft_dump_register - dump a register value to a netlink attribute
10350  *
10351  *      @skb: socket buffer
10352  *      @attr: attribute number
10353  *      @reg: register number
10354  *
10355  *      Construct a netlink attribute containing the register number. For
10356  *      compatibility reasons, register numbers being a multiple of 4 are
10357  *      translated to the corresponding 128 bit register numbers.
10358  */
10359 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10360 {
10361         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10362                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10363         else
10364                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10365
10366         return nla_put_be32(skb, attr, htonl(reg));
10367 }
10368 EXPORT_SYMBOL_GPL(nft_dump_register);
10369
10370 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10371 {
10372         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10373                 return -EINVAL;
10374         if (len == 0)
10375                 return -EINVAL;
10376         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10377                 return -ERANGE;
10378
10379         return 0;
10380 }
10381
10382 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10383 {
10384         u32 reg;
10385         int err;
10386
10387         err = nft_parse_register(attr, &reg);
10388         if (err < 0)
10389                 return err;
10390
10391         err = nft_validate_register_load(reg, len);
10392         if (err < 0)
10393                 return err;
10394
10395         *sreg = reg;
10396         return 0;
10397 }
10398 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10399
10400 static int nft_validate_register_store(const struct nft_ctx *ctx,
10401                                        enum nft_registers reg,
10402                                        const struct nft_data *data,
10403                                        enum nft_data_types type,
10404                                        unsigned int len)
10405 {
10406         int err;
10407
10408         switch (reg) {
10409         case NFT_REG_VERDICT:
10410                 if (type != NFT_DATA_VERDICT)
10411                         return -EINVAL;
10412
10413                 if (data != NULL &&
10414                     (data->verdict.code == NFT_GOTO ||
10415                      data->verdict.code == NFT_JUMP)) {
10416                         err = nf_tables_check_loops(ctx, data->verdict.chain);
10417                         if (err < 0)
10418                                 return err;
10419                 }
10420
10421                 return 0;
10422         default:
10423                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10424                         return -EINVAL;
10425                 if (len == 0)
10426                         return -EINVAL;
10427                 if (reg * NFT_REG32_SIZE + len >
10428                     sizeof_field(struct nft_regs, data))
10429                         return -ERANGE;
10430
10431                 if (data != NULL && type != NFT_DATA_VALUE)
10432                         return -EINVAL;
10433                 return 0;
10434         }
10435 }
10436
10437 int nft_parse_register_store(const struct nft_ctx *ctx,
10438                              const struct nlattr *attr, u8 *dreg,
10439                              const struct nft_data *data,
10440                              enum nft_data_types type, unsigned int len)
10441 {
10442         int err;
10443         u32 reg;
10444
10445         err = nft_parse_register(attr, &reg);
10446         if (err < 0)
10447                 return err;
10448
10449         err = nft_validate_register_store(ctx, reg, data, type, len);
10450         if (err < 0)
10451                 return err;
10452
10453         *dreg = reg;
10454         return 0;
10455 }
10456 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10457
10458 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10459         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
10460         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
10461                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
10462         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10463 };
10464
10465 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10466                             struct nft_data_desc *desc, const struct nlattr *nla)
10467 {
10468         u8 genmask = nft_genmask_next(ctx->net);
10469         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10470         struct nft_chain *chain;
10471         int err;
10472
10473         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10474                                           nft_verdict_policy, NULL);
10475         if (err < 0)
10476                 return err;
10477
10478         if (!tb[NFTA_VERDICT_CODE])
10479                 return -EINVAL;
10480         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10481
10482         switch (data->verdict.code) {
10483         default:
10484                 switch (data->verdict.code & NF_VERDICT_MASK) {
10485                 case NF_ACCEPT:
10486                 case NF_DROP:
10487                 case NF_QUEUE:
10488                         break;
10489                 default:
10490                         return -EINVAL;
10491                 }
10492                 fallthrough;
10493         case NFT_CONTINUE:
10494         case NFT_BREAK:
10495         case NFT_RETURN:
10496                 break;
10497         case NFT_JUMP:
10498         case NFT_GOTO:
10499                 if (tb[NFTA_VERDICT_CHAIN]) {
10500                         chain = nft_chain_lookup(ctx->net, ctx->table,
10501                                                  tb[NFTA_VERDICT_CHAIN],
10502                                                  genmask);
10503                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10504                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10505                                                       tb[NFTA_VERDICT_CHAIN_ID]);
10506                         if (IS_ERR(chain))
10507                                 return PTR_ERR(chain);
10508                 } else {
10509                         return -EINVAL;
10510                 }
10511
10512                 if (IS_ERR(chain))
10513                         return PTR_ERR(chain);
10514                 if (nft_is_base_chain(chain))
10515                         return -EOPNOTSUPP;
10516                 if (nft_chain_is_bound(chain))
10517                         return -EINVAL;
10518                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10519                     chain->flags & NFT_CHAIN_BINDING)
10520                         return -EINVAL;
10521
10522                 chain->use++;
10523                 data->verdict.chain = chain;
10524                 break;
10525         }
10526
10527         desc->len = sizeof(data->verdict);
10528
10529         return 0;
10530 }
10531
10532 static void nft_verdict_uninit(const struct nft_data *data)
10533 {
10534         struct nft_chain *chain;
10535
10536         switch (data->verdict.code) {
10537         case NFT_JUMP:
10538         case NFT_GOTO:
10539                 chain = data->verdict.chain;
10540                 chain->use--;
10541                 break;
10542         }
10543 }
10544
10545 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10546 {
10547         struct nlattr *nest;
10548
10549         nest = nla_nest_start_noflag(skb, type);
10550         if (!nest)
10551                 goto nla_put_failure;
10552
10553         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10554                 goto nla_put_failure;
10555
10556         switch (v->code) {
10557         case NFT_JUMP:
10558         case NFT_GOTO:
10559                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10560                                    v->chain->name))
10561                         goto nla_put_failure;
10562         }
10563         nla_nest_end(skb, nest);
10564         return 0;
10565
10566 nla_put_failure:
10567         return -1;
10568 }
10569
10570 static int nft_value_init(const struct nft_ctx *ctx,
10571                           struct nft_data *data, struct nft_data_desc *desc,
10572                           const struct nlattr *nla)
10573 {
10574         unsigned int len;
10575
10576         len = nla_len(nla);
10577         if (len == 0)
10578                 return -EINVAL;
10579         if (len > desc->size)
10580                 return -EOVERFLOW;
10581         if (desc->len) {
10582                 if (len != desc->len)
10583                         return -EINVAL;
10584         } else {
10585                 desc->len = len;
10586         }
10587
10588         nla_memcpy(data->data, nla, len);
10589
10590         return 0;
10591 }
10592
10593 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10594                           unsigned int len)
10595 {
10596         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10597 }
10598
10599 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10600         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
10601         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
10602 };
10603
10604 /**
10605  *      nft_data_init - parse nf_tables data netlink attributes
10606  *
10607  *      @ctx: context of the expression using the data
10608  *      @data: destination struct nft_data
10609  *      @desc: data description
10610  *      @nla: netlink attribute containing data
10611  *
10612  *      Parse the netlink data attributes and initialize a struct nft_data.
10613  *      The type and length of data are returned in the data description.
10614  *
10615  *      The caller can indicate that it only wants to accept data of type
10616  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
10617  */
10618 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
10619                   struct nft_data_desc *desc, const struct nlattr *nla)
10620 {
10621         struct nlattr *tb[NFTA_DATA_MAX + 1];
10622         int err;
10623
10624         if (WARN_ON_ONCE(!desc->size))
10625                 return -EINVAL;
10626
10627         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
10628                                           nft_data_policy, NULL);
10629         if (err < 0)
10630                 return err;
10631
10632         if (tb[NFTA_DATA_VALUE]) {
10633                 if (desc->type != NFT_DATA_VALUE)
10634                         return -EINVAL;
10635
10636                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
10637         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
10638                 if (desc->type != NFT_DATA_VERDICT)
10639                         return -EINVAL;
10640
10641                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
10642         } else {
10643                 err = -EINVAL;
10644         }
10645
10646         return err;
10647 }
10648 EXPORT_SYMBOL_GPL(nft_data_init);
10649
10650 /**
10651  *      nft_data_release - release a nft_data item
10652  *
10653  *      @data: struct nft_data to release
10654  *      @type: type of data
10655  *
10656  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
10657  *      all others need to be released by calling this function.
10658  */
10659 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
10660 {
10661         if (type < NFT_DATA_VERDICT)
10662                 return;
10663         switch (type) {
10664         case NFT_DATA_VERDICT:
10665                 return nft_verdict_uninit(data);
10666         default:
10667                 WARN_ON(1);
10668         }
10669 }
10670 EXPORT_SYMBOL_GPL(nft_data_release);
10671
10672 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
10673                   enum nft_data_types type, unsigned int len)
10674 {
10675         struct nlattr *nest;
10676         int err;
10677
10678         nest = nla_nest_start_noflag(skb, attr);
10679         if (nest == NULL)
10680                 return -1;
10681
10682         switch (type) {
10683         case NFT_DATA_VALUE:
10684                 err = nft_value_dump(skb, data, len);
10685                 break;
10686         case NFT_DATA_VERDICT:
10687                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
10688                 break;
10689         default:
10690                 err = -EINVAL;
10691                 WARN_ON(1);
10692         }
10693
10694         nla_nest_end(skb, nest);
10695         return err;
10696 }
10697 EXPORT_SYMBOL_GPL(nft_data_dump);
10698
10699 int __nft_release_basechain(struct nft_ctx *ctx)
10700 {
10701         struct nft_rule *rule, *nr;
10702
10703         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
10704                 return 0;
10705
10706         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
10707         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
10708                 list_del(&rule->list);
10709                 ctx->chain->use--;
10710                 nf_tables_rule_release(ctx, rule);
10711         }
10712         nft_chain_del(ctx->chain);
10713         ctx->table->use--;
10714         nf_tables_chain_destroy(ctx);
10715
10716         return 0;
10717 }
10718 EXPORT_SYMBOL_GPL(__nft_release_basechain);
10719
10720 static void __nft_release_hook(struct net *net, struct nft_table *table)
10721 {
10722         struct nft_flowtable *flowtable;
10723         struct nft_chain *chain;
10724
10725         list_for_each_entry(chain, &table->chains, list)
10726                 __nf_tables_unregister_hook(net, table, chain, true);
10727         list_for_each_entry(flowtable, &table->flowtables, list)
10728                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
10729                                                      true);
10730 }
10731
10732 static void __nft_release_hooks(struct net *net)
10733 {
10734         struct nftables_pernet *nft_net = nft_pernet(net);
10735         struct nft_table *table;
10736
10737         list_for_each_entry(table, &nft_net->tables, list) {
10738                 if (nft_table_has_owner(table))
10739                         continue;
10740
10741                 __nft_release_hook(net, table);
10742         }
10743 }
10744
10745 static void __nft_release_table(struct net *net, struct nft_table *table)
10746 {
10747         struct nft_flowtable *flowtable, *nf;
10748         struct nft_chain *chain, *nc;
10749         struct nft_object *obj, *ne;
10750         struct nft_rule *rule, *nr;
10751         struct nft_set *set, *ns;
10752         struct nft_ctx ctx = {
10753                 .net    = net,
10754                 .family = NFPROTO_NETDEV,
10755         };
10756
10757         ctx.family = table->family;
10758         ctx.table = table;
10759         list_for_each_entry(chain, &table->chains, list) {
10760                 ctx.chain = chain;
10761                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
10762                         list_del(&rule->list);
10763                         chain->use--;
10764                         nf_tables_rule_release(&ctx, rule);
10765                 }
10766         }
10767         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
10768                 list_del(&flowtable->list);
10769                 table->use--;
10770                 nf_tables_flowtable_destroy(flowtable);
10771         }
10772         list_for_each_entry_safe(set, ns, &table->sets, list) {
10773                 list_del(&set->list);
10774                 table->use--;
10775                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10776                         nft_map_deactivate(&ctx, set);
10777
10778                 nft_set_destroy(&ctx, set);
10779         }
10780         list_for_each_entry_safe(obj, ne, &table->objects, list) {
10781                 nft_obj_del(obj);
10782                 table->use--;
10783                 nft_obj_destroy(&ctx, obj);
10784         }
10785         list_for_each_entry_safe(chain, nc, &table->chains, list) {
10786                 ctx.chain = chain;
10787                 nft_chain_del(chain);
10788                 table->use--;
10789                 nf_tables_chain_destroy(&ctx);
10790         }
10791         nf_tables_table_destroy(&ctx);
10792 }
10793
10794 static void __nft_release_tables(struct net *net)
10795 {
10796         struct nftables_pernet *nft_net = nft_pernet(net);
10797         struct nft_table *table, *nt;
10798
10799         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
10800                 if (nft_table_has_owner(table))
10801                         continue;
10802
10803                 list_del(&table->list);
10804
10805                 __nft_release_table(net, table);
10806         }
10807 }
10808
10809 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
10810                             void *ptr)
10811 {
10812         struct nft_table *table, *to_delete[8];
10813         struct nftables_pernet *nft_net;
10814         struct netlink_notify *n = ptr;
10815         struct net *net = n->net;
10816         unsigned int deleted;
10817         bool restart = false;
10818
10819         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
10820                 return NOTIFY_DONE;
10821
10822         nft_net = nft_pernet(net);
10823         deleted = 0;
10824         mutex_lock(&nft_net->commit_mutex);
10825         if (!list_empty(&nf_tables_destroy_list))
10826                 rcu_barrier();
10827 again:
10828         list_for_each_entry(table, &nft_net->tables, list) {
10829                 if (nft_table_has_owner(table) &&
10830                     n->portid == table->nlpid) {
10831                         __nft_release_hook(net, table);
10832                         list_del_rcu(&table->list);
10833                         to_delete[deleted++] = table;
10834                         if (deleted >= ARRAY_SIZE(to_delete))
10835                                 break;
10836                 }
10837         }
10838         if (deleted) {
10839                 restart = deleted >= ARRAY_SIZE(to_delete);
10840                 synchronize_rcu();
10841                 while (deleted)
10842                         __nft_release_table(net, to_delete[--deleted]);
10843
10844                 if (restart)
10845                         goto again;
10846         }
10847         mutex_unlock(&nft_net->commit_mutex);
10848
10849         return NOTIFY_DONE;
10850 }
10851
10852 static struct notifier_block nft_nl_notifier = {
10853         .notifier_call  = nft_rcv_nl_event,
10854 };
10855
10856 static int __net_init nf_tables_init_net(struct net *net)
10857 {
10858         struct nftables_pernet *nft_net = nft_pernet(net);
10859
10860         INIT_LIST_HEAD(&nft_net->tables);
10861         INIT_LIST_HEAD(&nft_net->commit_list);
10862         INIT_LIST_HEAD(&nft_net->binding_list);
10863         INIT_LIST_HEAD(&nft_net->module_list);
10864         INIT_LIST_HEAD(&nft_net->notify_list);
10865         mutex_init(&nft_net->commit_mutex);
10866         nft_net->base_seq = 1;
10867
10868         return 0;
10869 }
10870
10871 static void __net_exit nf_tables_pre_exit_net(struct net *net)
10872 {
10873         struct nftables_pernet *nft_net = nft_pernet(net);
10874
10875         mutex_lock(&nft_net->commit_mutex);
10876         __nft_release_hooks(net);
10877         mutex_unlock(&nft_net->commit_mutex);
10878 }
10879
10880 static void __net_exit nf_tables_exit_net(struct net *net)
10881 {
10882         struct nftables_pernet *nft_net = nft_pernet(net);
10883
10884         mutex_lock(&nft_net->commit_mutex);
10885         if (!list_empty(&nft_net->commit_list) ||
10886             !list_empty(&nft_net->module_list))
10887                 __nf_tables_abort(net, NFNL_ABORT_NONE);
10888         __nft_release_tables(net);
10889         mutex_unlock(&nft_net->commit_mutex);
10890         WARN_ON_ONCE(!list_empty(&nft_net->tables));
10891         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
10892         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10893 }
10894
10895 static struct pernet_operations nf_tables_net_ops = {
10896         .init           = nf_tables_init_net,
10897         .pre_exit       = nf_tables_pre_exit_net,
10898         .exit           = nf_tables_exit_net,
10899         .id             = &nf_tables_net_id,
10900         .size           = sizeof(struct nftables_pernet),
10901 };
10902
10903 static int __init nf_tables_module_init(void)
10904 {
10905         int err;
10906
10907         err = register_pernet_subsys(&nf_tables_net_ops);
10908         if (err < 0)
10909                 return err;
10910
10911         err = nft_chain_filter_init();
10912         if (err < 0)
10913                 goto err_chain_filter;
10914
10915         err = nf_tables_core_module_init();
10916         if (err < 0)
10917                 goto err_core_module;
10918
10919         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10920         if (err < 0)
10921                 goto err_netdev_notifier;
10922
10923         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10924         if (err < 0)
10925                 goto err_rht_objname;
10926
10927         err = nft_offload_init();
10928         if (err < 0)
10929                 goto err_offload;
10930
10931         err = netlink_register_notifier(&nft_nl_notifier);
10932         if (err < 0)
10933                 goto err_netlink_notifier;
10934
10935         /* must be last */
10936         err = nfnetlink_subsys_register(&nf_tables_subsys);
10937         if (err < 0)
10938                 goto err_nfnl_subsys;
10939
10940         nft_chain_route_init();
10941
10942         return err;
10943
10944 err_nfnl_subsys:
10945         netlink_unregister_notifier(&nft_nl_notifier);
10946 err_netlink_notifier:
10947         nft_offload_exit();
10948 err_offload:
10949         rhltable_destroy(&nft_objname_ht);
10950 err_rht_objname:
10951         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10952 err_netdev_notifier:
10953         nf_tables_core_module_exit();
10954 err_core_module:
10955         nft_chain_filter_fini();
10956 err_chain_filter:
10957         unregister_pernet_subsys(&nf_tables_net_ops);
10958         return err;
10959 }
10960
10961 static void __exit nf_tables_module_exit(void)
10962 {
10963         nfnetlink_subsys_unregister(&nf_tables_subsys);
10964         netlink_unregister_notifier(&nft_nl_notifier);
10965         nft_offload_exit();
10966         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10967         nft_chain_filter_fini();
10968         nft_chain_route_fini();
10969         unregister_pernet_subsys(&nf_tables_net_ops);
10970         cancel_work_sync(&trans_destroy_work);
10971         rcu_barrier();
10972         rhltable_destroy(&nft_objname_ht);
10973         nf_tables_core_module_exit();
10974 }
10975
10976 module_init(nf_tables_module_init);
10977 module_exit(nf_tables_module_exit);
10978
10979 MODULE_LICENSE("GPL");
10980 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10981 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);