net/netfilter/nf_tables_api.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
   4  *
   5  * Development of this code funded by Astaro AG (http://www.astaro.com/)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/list.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/netlink.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/rhashtable.h>
  15 #include <linux/audit.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter/nfnetlink.h>
  18 #include <linux/netfilter/nf_tables.h>
  19 #include <net/netfilter/nf_flow_table.h>
  20 #include <net/netfilter/nf_tables_core.h>
  21 #include <net/netfilter/nf_tables.h>
  22 #include <net/netfilter/nf_tables_offload.h>
  23 #include <net/net_namespace.h>
  24 #include <net/sock.h>
  25
  26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
  27
  28 unsigned int nf_tables_net_id __read_mostly;
  29
  30 static LIST_HEAD(nf_tables_expressions);
  31 static LIST_HEAD(nf_tables_objects);
  32 static LIST_HEAD(nf_tables_flowtables);
  33 static LIST_HEAD(nf_tables_destroy_list);
  34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  35 static u64 table_handle;
  36
  37 enum {
  38         NFT_VALIDATE_SKIP       = 0,
  39         NFT_VALIDATE_NEED,
  40         NFT_VALIDATE_DO,
  41 };
  42
  43 static struct rhltable nft_objname_ht;
  44
  45 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  46 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  47 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  48
  49 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  50 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  51 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  52
  53 static const struct rhashtable_params nft_chain_ht_params = {
  54         .head_offset            = offsetof(struct nft_chain, rhlhead),
  55         .key_offset             = offsetof(struct nft_chain, name),
  56         .hashfn                 = nft_chain_hash,
  57         .obj_hashfn             = nft_chain_hash_obj,
  58         .obj_cmpfn              = nft_chain_hash_cmp,
  59         .automatic_shrinking    = true,
  60 };
  61
  62 static const struct rhashtable_params nft_objname_ht_params = {
  63         .head_offset            = offsetof(struct nft_object, rhlhead),
  64         .key_offset             = offsetof(struct nft_object, key),
  65         .hashfn                 = nft_objname_hash,
  66         .obj_hashfn             = nft_objname_hash_obj,
  67         .obj_cmpfn              = nft_objname_hash_cmp,
  68         .automatic_shrinking    = true,
  69 };
  70
  71 struct nft_audit_data {
  72         struct nft_table *table;
  73         int entries;
  74         int op;
  75         struct list_head list;
  76 };
  77
  78 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  79         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  80         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  81         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  82         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  83         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  84         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  85         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  86         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  87         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  88         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  89         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  90         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  91         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  92         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  93         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  94         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  95         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  96         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  97         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
  98         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
  99         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
 100         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 101         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 102         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 103         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 104 };
 105
 106 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
 107 {
 108         struct nftables_pernet *nft_net = nft_pernet(net);
 109
 110         switch (nft_net->validate_state) {
 111         case NFT_VALIDATE_SKIP:
 112                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 113                 break;
 114         case NFT_VALIDATE_NEED:
 115                 break;
 116         case NFT_VALIDATE_DO:
 117                 if (new_validate_state == NFT_VALIDATE_NEED)
 118                         return;
 119         }
 120
 121         nft_net->validate_state = new_validate_state;
 122 }
 123 static void nf_tables_trans_destroy_work(struct work_struct *w);
 124 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 125
 126 static void nft_ctx_init(struct nft_ctx *ctx,
 127                          struct net *net,
 128                          const struct sk_buff *skb,
 129                          const struct nlmsghdr *nlh,
 130                          u8 family,
 131                          struct nft_table *table,
 132                          struct nft_chain *chain,
 133                          const struct nlattr * const *nla)
 134 {
 135         ctx->net        = net;
 136         ctx->family     = family;
 137         ctx->level      = 0;
 138         ctx->table      = table;
 139         ctx->chain      = chain;
 140         ctx->nla        = nla;
 141         ctx->portid     = NETLINK_CB(skb).portid;
 142         ctx->report     = nlmsg_report(nlh);
 143         ctx->flags      = nlh->nlmsg_flags;
 144         ctx->seq        = nlh->nlmsg_seq;
 145 }
 146
 147 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 148                                              int msg_type, u32 size, gfp_t gfp)
 149 {
 150         struct nft_trans *trans;
 151
 152         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 153         if (trans == NULL)
 154                 return NULL;
 155
 156         trans->msg_type = msg_type;
 157         trans->ctx      = *ctx;
 158
 159         return trans;
 160 }
 161
 162 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 163                                          int msg_type, u32 size)
 164 {
 165         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 166 }
 167
 168 static void nft_trans_destroy(struct nft_trans *trans)
 169 {
 170         list_del(&trans->list);
 171         kfree(trans);
 172 }
 173
 174 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 175 {
 176         struct nftables_pernet *nft_net;
 177         struct net *net = ctx->net;
 178         struct nft_trans *trans;
 179
 180         if (!nft_set_is_anonymous(set))
 181                 return;
 182
 183         nft_net = nft_pernet(net);
 184         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 185                 switch (trans->msg_type) {
 186                 case NFT_MSG_NEWSET:
 187                         if (nft_trans_set(trans) == set)
 188                                 nft_trans_set_bound(trans) = true;
 189                         break;
 190                 case NFT_MSG_NEWSETELEM:
 191                         if (nft_trans_elem_set(trans) == set)
 192                                 nft_trans_elem_set_bound(trans) = true;
 193                         break;
 194                 }
 195         }
 196 }
 197
 198 static int nft_netdev_register_hooks(struct net *net,
 199                                      struct list_head *hook_list)
 200 {
 201         struct nft_hook *hook;
 202         int err, j;
 203
 204         j = 0;
 205         list_for_each_entry(hook, hook_list, list) {
 206                 err = nf_register_net_hook(net, &hook->ops);
 207                 if (err < 0)
 208                         goto err_register;
 209
 210                 j++;
 211         }
 212         return 0;
 213
 214 err_register:
 215         list_for_each_entry(hook, hook_list, list) {
 216                 if (j-- <= 0)
 217                         break;
 218
 219                 nf_unregister_net_hook(net, &hook->ops);
 220         }
 221         return err;
 222 }
 223
 224 static void nft_netdev_unregister_hooks(struct net *net,
 225                                         struct list_head *hook_list,
 226                                         bool release_netdev)
 227 {
 228         struct nft_hook *hook, *next;
 229
 230         list_for_each_entry_safe(hook, next, hook_list, list) {
 231                 nf_unregister_net_hook(net, &hook->ops);
 232                 if (release_netdev) {
 233                         list_del(&hook->list);
 234                         kfree_rcu(hook, rcu);
 235                 }
 236         }
 237 }
 238
 239 static int nf_tables_register_hook(struct net *net,
 240                                    const struct nft_table *table,
 241                                    struct nft_chain *chain)
 242 {
 243         struct nft_base_chain *basechain;
 244         const struct nf_hook_ops *ops;
 245
 246         if (table->flags & NFT_TABLE_F_DORMANT ||
 247             !nft_is_base_chain(chain))
 248                 return 0;
 249
 250         basechain = nft_base_chain(chain);
 251         ops = &basechain->ops;
 252
 253         if (basechain->type->ops_register)
 254                 return basechain->type->ops_register(net, ops);
 255
 256         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 257                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 258
 259         return nf_register_net_hook(net, &basechain->ops);
 260 }
 261
 262 static void __nf_tables_unregister_hook(struct net *net,
 263                                         const struct nft_table *table,
 264                                         struct nft_chain *chain,
 265                                         bool release_netdev)
 266 {
 267         struct nft_base_chain *basechain;
 268         const struct nf_hook_ops *ops;
 269
 270         if (table->flags & NFT_TABLE_F_DORMANT ||
 271             !nft_is_base_chain(chain))
 272                 return;
 273         basechain = nft_base_chain(chain);
 274         ops = &basechain->ops;
 275
 276         if (basechain->type->ops_unregister)
 277                 return basechain->type->ops_unregister(net, ops);
 278
 279         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 280                 nft_netdev_unregister_hooks(net, &basechain->hook_list,
 281                                             release_netdev);
 282         else
 283                 nf_unregister_net_hook(net, &basechain->ops);
 284 }
 285
 286 static void nf_tables_unregister_hook(struct net *net,
 287                                       const struct nft_table *table,
 288                                       struct nft_chain *chain)
 289 {
 290         return __nf_tables_unregister_hook(net, table, chain, false);
 291 }
 292
 293 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 294 {
 295         struct nftables_pernet *nft_net = nft_pernet(net);
 296
 297         list_add_tail(&trans->list, &nft_net->commit_list);
 298 }
 299
 300 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 301 {
 302         struct nft_trans *trans;
 303
 304         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 305         if (trans == NULL)
 306                 return -ENOMEM;
 307
 308         if (msg_type == NFT_MSG_NEWTABLE)
 309                 nft_activate_next(ctx->net, ctx->table);
 310
 311         nft_trans_commit_list_add_tail(ctx->net, trans);
 312         return 0;
 313 }
 314
 315 static int nft_deltable(struct nft_ctx *ctx)
 316 {
 317         int err;
 318
 319         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 320         if (err < 0)
 321                 return err;
 322
 323         nft_deactivate_next(ctx->net, ctx->table);
 324         return err;
 325 }
 326
 327 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 328 {
 329         struct nft_trans *trans;
 330
 331         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 332         if (trans == NULL)
 333                 return ERR_PTR(-ENOMEM);
 334
 335         if (msg_type == NFT_MSG_NEWCHAIN) {
 336                 nft_activate_next(ctx->net, ctx->chain);
 337
 338                 if (ctx->nla[NFTA_CHAIN_ID]) {
 339                         nft_trans_chain_id(trans) =
 340                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 341                 }
 342         }
 343
 344         nft_trans_commit_list_add_tail(ctx->net, trans);
 345         return trans;
 346 }
 347
 348 static int nft_delchain(struct nft_ctx *ctx)
 349 {
 350         struct nft_trans *trans;
 351
 352         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 353         if (IS_ERR(trans))
 354                 return PTR_ERR(trans);
 355
 356         ctx->table->use--;
 357         nft_deactivate_next(ctx->net, ctx->chain);
 358
 359         return 0;
 360 }
 361
 362 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
 363                                    struct nft_rule *rule)
 364 {
 365         struct nft_expr *expr;
 366
 367         expr = nft_expr_first(rule);
 368         while (nft_expr_more(rule, expr)) {
 369                 if (expr->ops->activate)
 370                         expr->ops->activate(ctx, expr);
 371
 372                 expr = nft_expr_next(expr);
 373         }
 374 }
 375
 376 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
 377                                      struct nft_rule *rule,
 378                                      enum nft_trans_phase phase)
 379 {
 380         struct nft_expr *expr;
 381
 382         expr = nft_expr_first(rule);
 383         while (nft_expr_more(rule, expr)) {
 384                 if (expr->ops->deactivate)
 385                         expr->ops->deactivate(ctx, expr, phase);
 386
 387                 expr = nft_expr_next(expr);
 388         }
 389 }
 390
 391 static int
 392 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 393 {
 394         /* You cannot delete the same rule twice */
 395         if (nft_is_active_next(ctx->net, rule)) {
 396                 nft_deactivate_next(ctx->net, rule);
 397                 ctx->chain->use--;
 398                 return 0;
 399         }
 400         return -ENOENT;
 401 }
 402
 403 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 404                                             struct nft_rule *rule)
 405 {
 406         struct nft_trans *trans;
 407
 408         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 409         if (trans == NULL)
 410                 return NULL;
 411
 412         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 413                 nft_trans_rule_id(trans) =
 414                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 415         }
 416         nft_trans_rule(trans) = rule;
 417         nft_trans_commit_list_add_tail(ctx->net, trans);
 418
 419         return trans;
 420 }
 421
 422 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 423 {
 424         struct nft_flow_rule *flow;
 425         struct nft_trans *trans;
 426         int err;
 427
 428         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 429         if (trans == NULL)
 430                 return -ENOMEM;
 431
 432         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 433                 flow = nft_flow_rule_create(ctx->net, rule);
 434                 if (IS_ERR(flow)) {
 435                         nft_trans_destroy(trans);
 436                         return PTR_ERR(flow);
 437                 }
 438
 439                 nft_trans_flow_rule(trans) = flow;
 440         }
 441
 442         err = nf_tables_delrule_deactivate(ctx, rule);
 443         if (err < 0) {
 444                 nft_trans_destroy(trans);
 445                 return err;
 446         }
 447         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 448
 449         return 0;
 450 }
 451
 452 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 453 {
 454         struct nft_rule *rule;
 455         int err;
 456
 457         list_for_each_entry(rule, &ctx->chain->rules, list) {
 458                 if (!nft_is_active_next(ctx->net, rule))
 459                         continue;
 460
 461                 err = nft_delrule(ctx, rule);
 462                 if (err < 0)
 463                         return err;
 464         }
 465         return 0;
 466 }
 467
 468 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 469                              struct nft_set *set)
 470 {
 471         struct nft_trans *trans;
 472
 473         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 474         if (trans == NULL)
 475                 return -ENOMEM;
 476
 477         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
 478                 nft_trans_set_id(trans) =
 479                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 480                 nft_activate_next(ctx->net, set);
 481         }
 482         nft_trans_set(trans) = set;
 483         nft_trans_commit_list_add_tail(ctx->net, trans);
 484
 485         return 0;
 486 }
 487
 488 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 489 {
 490         int err;
 491
 492         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 493         if (err < 0)
 494                 return err;
 495
 496         nft_deactivate_next(ctx->net, set);
 497         ctx->table->use--;
 498
 499         return err;
 500 }
 501
 502 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 503                              struct nft_object *obj)
 504 {
 505         struct nft_trans *trans;
 506
 507         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 508         if (trans == NULL)
 509                 return -ENOMEM;
 510
 511         if (msg_type == NFT_MSG_NEWOBJ)
 512                 nft_activate_next(ctx->net, obj);
 513
 514         nft_trans_obj(trans) = obj;
 515         nft_trans_commit_list_add_tail(ctx->net, trans);
 516
 517         return 0;
 518 }
 519
 520 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 521 {
 522         int err;
 523
 524         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 525         if (err < 0)
 526                 return err;
 527
 528         nft_deactivate_next(ctx->net, obj);
 529         ctx->table->use--;
 530
 531         return err;
 532 }
 533
 534 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 535                                    struct nft_flowtable *flowtable)
 536 {
 537         struct nft_trans *trans;
 538
 539         trans = nft_trans_alloc(ctx, msg_type,
 540                                 sizeof(struct nft_trans_flowtable));
 541         if (trans == NULL)
 542                 return -ENOMEM;
 543
 544         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 545                 nft_activate_next(ctx->net, flowtable);
 546
 547         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
 548         nft_trans_flowtable(trans) = flowtable;
 549         nft_trans_commit_list_add_tail(ctx->net, trans);
 550
 551         return 0;
 552 }
 553
 554 static int nft_delflowtable(struct nft_ctx *ctx,
 555                             struct nft_flowtable *flowtable)
 556 {
 557         int err;
 558
 559         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 560         if (err < 0)
 561                 return err;
 562
 563         nft_deactivate_next(ctx->net, flowtable);
 564         ctx->table->use--;
 565
 566         return err;
 567 }
 568
 569 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
 570 {
 571         int i;
 572
 573         for (i = track->regs[dreg].num_reg; i > 0; i--)
 574                 __nft_reg_track_cancel(track, dreg - i);
 575 }
 576
 577 static void __nft_reg_track_update(struct nft_regs_track *track,
 578                                    const struct nft_expr *expr,
 579                                    u8 dreg, u8 num_reg)
 580 {
 581         track->regs[dreg].selector = expr;
 582         track->regs[dreg].bitwise = NULL;
 583         track->regs[dreg].num_reg = num_reg;
 584 }
 585
 586 void nft_reg_track_update(struct nft_regs_track *track,
 587                           const struct nft_expr *expr, u8 dreg, u8 len)
 588 {
 589         unsigned int regcount;
 590         int i;
 591
 592         __nft_reg_track_clobber(track, dreg);
 593
 594         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 595         for (i = 0; i < regcount; i++, dreg++)
 596                 __nft_reg_track_update(track, expr, dreg, i);
 597 }
 598 EXPORT_SYMBOL_GPL(nft_reg_track_update);
 599
 600 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
 601 {
 602         unsigned int regcount;
 603         int i;
 604
 605         __nft_reg_track_clobber(track, dreg);
 606
 607         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 608         for (i = 0; i < regcount; i++, dreg++)
 609                 __nft_reg_track_cancel(track, dreg);
 610 }
 611 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
 612
 613 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
 614 {
 615         track->regs[dreg].selector = NULL;
 616         track->regs[dreg].bitwise = NULL;
 617         track->regs[dreg].num_reg = 0;
 618 }
 619 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
 620
 621 /*
 622  * Tables
 623  */
 624
 625 static struct nft_table *nft_table_lookup(const struct net *net,
 626                                           const struct nlattr *nla,
 627                                           u8 family, u8 genmask, u32 nlpid)
 628 {
 629         struct nftables_pernet *nft_net;
 630         struct nft_table *table;
 631
 632         if (nla == NULL)
 633                 return ERR_PTR(-EINVAL);
 634
 635         nft_net = nft_pernet(net);
 636         list_for_each_entry_rcu(table, &nft_net->tables, list,
 637                                 lockdep_is_held(&nft_net->commit_mutex)) {
 638                 if (!nla_strcmp(nla, table->name) &&
 639                     table->family == family &&
 640                     nft_active_genmask(table, genmask)) {
 641                         if (nft_table_has_owner(table) &&
 642                             nlpid && table->nlpid != nlpid)
 643                                 return ERR_PTR(-EPERM);
 644
 645                         return table;
 646                 }
 647         }
 648
 649         return ERR_PTR(-ENOENT);
 650 }
 651
 652 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 653                                                    const struct nlattr *nla,
 654                                                    u8 genmask, u32 nlpid)
 655 {
 656         struct nftables_pernet *nft_net;
 657         struct nft_table *table;
 658
 659         nft_net = nft_pernet(net);
 660         list_for_each_entry(table, &nft_net->tables, list) {
 661                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 662                     nft_active_genmask(table, genmask)) {
 663                         if (nft_table_has_owner(table) &&
 664                             nlpid && table->nlpid != nlpid)
 665                                 return ERR_PTR(-EPERM);
 666
 667                         return table;
 668                 }
 669         }
 670
 671         return ERR_PTR(-ENOENT);
 672 }
 673
 674 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 675 {
 676         return ++table->hgenerator;
 677 }
 678
 679 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 680
 681 static const struct nft_chain_type *
 682 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 683 {
 684         if (family >= NFPROTO_NUMPROTO ||
 685             type >= NFT_CHAIN_T_MAX)
 686                 return NULL;
 687
 688         return chain_type[family][type];
 689 }
 690
 691 static const struct nft_chain_type *
 692 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 693 {
 694         const struct nft_chain_type *type;
 695         int i;
 696
 697         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 698                 type = __nft_chain_type_get(family, i);
 699                 if (!type)
 700                         continue;
 701                 if (!nla_strcmp(nla, type->name))
 702                         return type;
 703         }
 704         return NULL;
 705 }
 706
 707 struct nft_module_request {
 708         struct list_head        list;
 709         char                    module[MODULE_NAME_LEN];
 710         bool                    done;
 711 };
 712
 713 #ifdef CONFIG_MODULES
 714 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 715                                       ...)
 716 {
 717         char module_name[MODULE_NAME_LEN];
 718         struct nftables_pernet *nft_net;
 719         struct nft_module_request *req;
 720         va_list args;
 721         int ret;
 722
 723         va_start(args, fmt);
 724         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 725         va_end(args);
 726         if (ret >= MODULE_NAME_LEN)
 727                 return 0;
 728
 729         nft_net = nft_pernet(net);
 730         list_for_each_entry(req, &nft_net->module_list, list) {
 731                 if (!strcmp(req->module, module_name)) {
 732                         if (req->done)
 733                                 return 0;
 734
 735                         /* A request to load this module already exists. */
 736                         return -EAGAIN;
 737                 }
 738         }
 739
 740         req = kmalloc(sizeof(*req), GFP_KERNEL);
 741         if (!req)
 742                 return -ENOMEM;
 743
 744         req->done = false;
 745         strlcpy(req->module, module_name, MODULE_NAME_LEN);
 746         list_add_tail(&req->list, &nft_net->module_list);
 747
 748         return -EAGAIN;
 749 }
 750 EXPORT_SYMBOL_GPL(nft_request_module);
 751 #endif
 752
 753 static void lockdep_nfnl_nft_mutex_not_held(void)
 754 {
 755 #ifdef CONFIG_PROVE_LOCKING
 756         if (debug_locks)
 757                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 758 #endif
 759 }
 760
 761 static const struct nft_chain_type *
 762 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 763                             u8 family, bool autoload)
 764 {
 765         const struct nft_chain_type *type;
 766
 767         type = __nf_tables_chain_type_lookup(nla, family);
 768         if (type != NULL)
 769                 return type;
 770
 771         lockdep_nfnl_nft_mutex_not_held();
 772 #ifdef CONFIG_MODULES
 773         if (autoload) {
 774                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 775                                        nla_len(nla),
 776                                        (const char *)nla_data(nla)) == -EAGAIN)
 777                         return ERR_PTR(-EAGAIN);
 778         }
 779 #endif
 780         return ERR_PTR(-ENOENT);
 781 }
 782
 783 static __be16 nft_base_seq(const struct net *net)
 784 {
 785         struct nftables_pernet *nft_net = nft_pernet(net);
 786
 787         return htons(nft_net->base_seq & 0xffff);
 788 }
 789
 790 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 791         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 792                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 793         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 794         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 795         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 796                                     .len = NFT_USERDATA_MAXLEN }
 797 };
 798
 799 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 800                                      u32 portid, u32 seq, int event, u32 flags,
 801                                      int family, const struct nft_table *table)
 802 {
 803         struct nlmsghdr *nlh;
 804
 805         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 806         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 807                            NFNETLINK_V0, nft_base_seq(net));
 808         if (!nlh)
 809                 goto nla_put_failure;
 810
 811         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 812             nla_put_be32(skb, NFTA_TABLE_FLAGS,
 813                          htonl(table->flags & NFT_TABLE_F_MASK)) ||
 814             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 815             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 816                          NFTA_TABLE_PAD))
 817                 goto nla_put_failure;
 818         if (nft_table_has_owner(table) &&
 819             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 820                 goto nla_put_failure;
 821
 822         if (table->udata) {
 823                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 824                         goto nla_put_failure;
 825         }
 826
 827         nlmsg_end(skb, nlh);
 828         return 0;
 829
 830 nla_put_failure:
 831         nlmsg_trim(skb, nlh);
 832         return -1;
 833 }
 834
 835 struct nftnl_skb_parms {
 836         bool report;
 837 };
 838 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 839
 840 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 841                                struct list_head *notify_list)
 842 {
 843         NFT_CB(skb).report = report;
 844         list_add_tail(&skb->list, notify_list);
 845 }
 846
 847 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 848 {
 849         struct nftables_pernet *nft_net;
 850         struct sk_buff *skb;
 851         u16 flags = 0;
 852         int err;
 853
 854         if (!ctx->report &&
 855             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 856                 return;
 857
 858         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 859         if (skb == NULL)
 860                 goto err;
 861
 862         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
 863                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
 864
 865         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 866                                         event, flags, ctx->family, ctx->table);
 867         if (err < 0) {
 868                 kfree_skb(skb);
 869                 goto err;
 870         }
 871
 872         nft_net = nft_pernet(ctx->net);
 873         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
 874         return;
 875 err:
 876         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 877 }
 878
 879 static int nf_tables_dump_tables(struct sk_buff *skb,
 880                                  struct netlink_callback *cb)
 881 {
 882         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 883         struct nftables_pernet *nft_net;
 884         const struct nft_table *table;
 885         unsigned int idx = 0, s_idx = cb->args[0];
 886         struct net *net = sock_net(skb->sk);
 887         int family = nfmsg->nfgen_family;
 888
 889         rcu_read_lock();
 890         nft_net = nft_pernet(net);
 891         cb->seq = nft_net->base_seq;
 892
 893         list_for_each_entry_rcu(table, &nft_net->tables, list) {
 894                 if (family != NFPROTO_UNSPEC && family != table->family)
 895                         continue;
 896
 897                 if (idx < s_idx)
 898                         goto cont;
 899                 if (idx > s_idx)
 900                         memset(&cb->args[1], 0,
 901                                sizeof(cb->args) - sizeof(cb->args[0]));
 902                 if (!nft_is_active(net, table))
 903                         continue;
 904                 if (nf_tables_fill_table_info(skb, net,
 905                                               NETLINK_CB(cb->skb).portid,
 906                                               cb->nlh->nlmsg_seq,
 907                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 908                                               table->family, table) < 0)
 909                         goto done;
 910
 911                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 912 cont:
 913                 idx++;
 914         }
 915 done:
 916         rcu_read_unlock();
 917         cb->args[0] = idx;
 918         return skb->len;
 919 }
 920
 921 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 922                                       const struct nlmsghdr *nlh,
 923                                       struct netlink_dump_control *c)
 924 {
 925         int err;
 926
 927         if (!try_module_get(THIS_MODULE))
 928                 return -EINVAL;
 929
 930         rcu_read_unlock();
 931         err = netlink_dump_start(nlsk, skb, nlh, c);
 932         rcu_read_lock();
 933         module_put(THIS_MODULE);
 934
 935         return err;
 936 }
 937
 938 /* called with rcu_read_lock held */
 939 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
 940                               const struct nlattr * const nla[])
 941 {
 942         struct netlink_ext_ack *extack = info->extack;
 943         u8 genmask = nft_genmask_cur(info->net);
 944         u8 family = info->nfmsg->nfgen_family;
 945         const struct nft_table *table;
 946         struct net *net = info->net;
 947         struct sk_buff *skb2;
 948         int err;
 949
 950         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
 951                 struct netlink_dump_control c = {
 952                         .dump = nf_tables_dump_tables,
 953                         .module = THIS_MODULE,
 954                 };
 955
 956                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
 957         }
 958
 959         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
 960         if (IS_ERR(table)) {
 961                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 962                 return PTR_ERR(table);
 963         }
 964
 965         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 966         if (!skb2)
 967                 return -ENOMEM;
 968
 969         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 970                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
 971                                         0, family, table);
 972         if (err < 0)
 973                 goto err_fill_table_info;
 974
 975         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 976
 977 err_fill_table_info:
 978         kfree_skb(skb2);
 979         return err;
 980 }
 981
 982 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
 983 {
 984         struct nft_chain *chain;
 985         u32 i = 0;
 986
 987         list_for_each_entry(chain, &table->chains, list) {
 988                 if (!nft_is_active_next(net, chain))
 989                         continue;
 990                 if (!nft_is_base_chain(chain))
 991                         continue;
 992
 993                 if (cnt && i++ == cnt)
 994                         break;
 995
 996                 nf_tables_unregister_hook(net, table, chain);
 997         }
 998 }
 999
1000 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1001 {
1002         struct nft_chain *chain;
1003         int err, i = 0;
1004
1005         list_for_each_entry(chain, &table->chains, list) {
1006                 if (!nft_is_active_next(net, chain))
1007                         continue;
1008                 if (!nft_is_base_chain(chain))
1009                         continue;
1010
1011                 err = nf_tables_register_hook(net, table, chain);
1012                 if (err < 0)
1013                         goto err_register_hooks;
1014
1015                 i++;
1016         }
1017         return 0;
1018
1019 err_register_hooks:
1020         if (i)
1021                 nft_table_disable(net, table, i);
1022         return err;
1023 }
1024
1025 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1026 {
1027         table->flags &= ~NFT_TABLE_F_DORMANT;
1028         nft_table_disable(net, table, 0);
1029         table->flags |= NFT_TABLE_F_DORMANT;
1030 }
1031
1032 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
1033 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
1034 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
1035 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
1036                                          __NFT_TABLE_F_WAS_AWAKEN)
1037
1038 static int nf_tables_updtable(struct nft_ctx *ctx)
1039 {
1040         struct nft_trans *trans;
1041         u32 flags;
1042         int ret;
1043
1044         if (!ctx->nla[NFTA_TABLE_FLAGS])
1045                 return 0;
1046
1047         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1048         if (flags & ~NFT_TABLE_F_MASK)
1049                 return -EOPNOTSUPP;
1050
1051         if (flags == ctx->table->flags)
1052                 return 0;
1053
1054         if ((nft_table_has_owner(ctx->table) &&
1055              !(flags & NFT_TABLE_F_OWNER)) ||
1056             (!nft_table_has_owner(ctx->table) &&
1057              flags & NFT_TABLE_F_OWNER))
1058                 return -EOPNOTSUPP;
1059
1060         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1061                                 sizeof(struct nft_trans_table));
1062         if (trans == NULL)
1063                 return -ENOMEM;
1064
1065         if ((flags & NFT_TABLE_F_DORMANT) &&
1066             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1067                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1068                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1069                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1070         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1071                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1072                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1073                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1074                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1075                         if (ret < 0)
1076                                 goto err_register_hooks;
1077
1078                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1079                 }
1080         }
1081
1082         nft_trans_table_update(trans) = true;
1083         nft_trans_commit_list_add_tail(ctx->net, trans);
1084
1085         return 0;
1086
1087 err_register_hooks:
1088         nft_trans_destroy(trans);
1089         return ret;
1090 }
1091
1092 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1093 {
1094         const char *name = data;
1095
1096         return jhash(name, strlen(name), seed);
1097 }
1098
1099 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1100 {
1101         const struct nft_chain *chain = data;
1102
1103         return nft_chain_hash(chain->name, 0, seed);
1104 }
1105
1106 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1107                               const void *ptr)
1108 {
1109         const struct nft_chain *chain = ptr;
1110         const char *name = arg->key;
1111
1112         return strcmp(chain->name, name);
1113 }
1114
1115 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1116 {
1117         const struct nft_object_hash_key *k = data;
1118
1119         seed ^= hash_ptr(k->table, 32);
1120
1121         return jhash(k->name, strlen(k->name), seed);
1122 }
1123
1124 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1125 {
1126         const struct nft_object *obj = data;
1127
1128         return nft_objname_hash(&obj->key, 0, seed);
1129 }
1130
1131 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1132                                 const void *ptr)
1133 {
1134         const struct nft_object_hash_key *k = arg->key;
1135         const struct nft_object *obj = ptr;
1136
1137         if (obj->key.table != k->table)
1138                 return -1;
1139
1140         return strcmp(obj->key.name, k->name);
1141 }
1142
1143 static bool nft_supported_family(u8 family)
1144 {
1145         return false
1146 #ifdef CONFIG_NF_TABLES_INET
1147                 || family == NFPROTO_INET
1148 #endif
1149 #ifdef CONFIG_NF_TABLES_IPV4
1150                 || family == NFPROTO_IPV4
1151 #endif
1152 #ifdef CONFIG_NF_TABLES_ARP
1153                 || family == NFPROTO_ARP
1154 #endif
1155 #ifdef CONFIG_NF_TABLES_NETDEV
1156                 || family == NFPROTO_NETDEV
1157 #endif
1158 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1159                 || family == NFPROTO_BRIDGE
1160 #endif
1161 #ifdef CONFIG_NF_TABLES_IPV6
1162                 || family == NFPROTO_IPV6
1163 #endif
1164                 ;
1165 }
1166
1167 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1168                               const struct nlattr * const nla[])
1169 {
1170         struct nftables_pernet *nft_net = nft_pernet(info->net);
1171         struct netlink_ext_ack *extack = info->extack;
1172         u8 genmask = nft_genmask_next(info->net);
1173         u8 family = info->nfmsg->nfgen_family;
1174         struct net *net = info->net;
1175         const struct nlattr *attr;
1176         struct nft_table *table;
1177         struct nft_ctx ctx;
1178         u32 flags = 0;
1179         int err;
1180
1181         if (!nft_supported_family(family))
1182                 return -EOPNOTSUPP;
1183
1184         lockdep_assert_held(&nft_net->commit_mutex);
1185         attr = nla[NFTA_TABLE_NAME];
1186         table = nft_table_lookup(net, attr, family, genmask,
1187                                  NETLINK_CB(skb).portid);
1188         if (IS_ERR(table)) {
1189                 if (PTR_ERR(table) != -ENOENT)
1190                         return PTR_ERR(table);
1191         } else {
1192                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1193                         NL_SET_BAD_ATTR(extack, attr);
1194                         return -EEXIST;
1195                 }
1196                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1197                         return -EOPNOTSUPP;
1198
1199                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1200
1201                 return nf_tables_updtable(&ctx);
1202         }
1203
1204         if (nla[NFTA_TABLE_FLAGS]) {
1205                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1206                 if (flags & ~NFT_TABLE_F_MASK)
1207                         return -EOPNOTSUPP;
1208         }
1209
1210         err = -ENOMEM;
1211         table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1212         if (table == NULL)
1213                 goto err_kzalloc;
1214
1215         table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1216         if (table->name == NULL)
1217                 goto err_strdup;
1218
1219         if (nla[NFTA_TABLE_USERDATA]) {
1220                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1221                 if (table->udata == NULL)
1222                         goto err_table_udata;
1223
1224                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1225         }
1226
1227         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1228         if (err)
1229                 goto err_chain_ht;
1230
1231         INIT_LIST_HEAD(&table->chains);
1232         INIT_LIST_HEAD(&table->sets);
1233         INIT_LIST_HEAD(&table->objects);
1234         INIT_LIST_HEAD(&table->flowtables);
1235         table->family = family;
1236         table->flags = flags;
1237         table->handle = ++table_handle;
1238         if (table->flags & NFT_TABLE_F_OWNER)
1239                 table->nlpid = NETLINK_CB(skb).portid;
1240
1241         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1242         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1243         if (err < 0)
1244                 goto err_trans;
1245
1246         list_add_tail_rcu(&table->list, &nft_net->tables);
1247         return 0;
1248 err_trans:
1249         rhltable_destroy(&table->chains_ht);
1250 err_chain_ht:
1251         kfree(table->udata);
1252 err_table_udata:
1253         kfree(table->name);
1254 err_strdup:
1255         kfree(table);
1256 err_kzalloc:
1257         return err;
1258 }
1259
1260 static int nft_flush_table(struct nft_ctx *ctx)
1261 {
1262         struct nft_flowtable *flowtable, *nft;
1263         struct nft_chain *chain, *nc;
1264         struct nft_object *obj, *ne;
1265         struct nft_set *set, *ns;
1266         int err;
1267
1268         list_for_each_entry(chain, &ctx->table->chains, list) {
1269                 if (!nft_is_active_next(ctx->net, chain))
1270                         continue;
1271
1272                 if (nft_chain_is_bound(chain))
1273                         continue;
1274
1275                 ctx->chain = chain;
1276
1277                 err = nft_delrule_by_chain(ctx);
1278                 if (err < 0)
1279                         goto out;
1280         }
1281
1282         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1283                 if (!nft_is_active_next(ctx->net, set))
1284                         continue;
1285
1286                 if (nft_set_is_anonymous(set) &&
1287                     !list_empty(&set->bindings))
1288                         continue;
1289
1290                 err = nft_delset(ctx, set);
1291                 if (err < 0)
1292                         goto out;
1293         }
1294
1295         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1296                 if (!nft_is_active_next(ctx->net, flowtable))
1297                         continue;
1298
1299                 err = nft_delflowtable(ctx, flowtable);
1300                 if (err < 0)
1301                         goto out;
1302         }
1303
1304         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1305                 if (!nft_is_active_next(ctx->net, obj))
1306                         continue;
1307
1308                 err = nft_delobj(ctx, obj);
1309                 if (err < 0)
1310                         goto out;
1311         }
1312
1313         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1314                 if (!nft_is_active_next(ctx->net, chain))
1315                         continue;
1316
1317                 if (nft_chain_is_bound(chain))
1318                         continue;
1319
1320                 ctx->chain = chain;
1321
1322                 err = nft_delchain(ctx);
1323                 if (err < 0)
1324                         goto out;
1325         }
1326
1327         err = nft_deltable(ctx);
1328 out:
1329         return err;
1330 }
1331
1332 static int nft_flush(struct nft_ctx *ctx, int family)
1333 {
1334         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1335         const struct nlattr * const *nla = ctx->nla;
1336         struct nft_table *table, *nt;
1337         int err = 0;
1338
1339         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1340                 if (family != AF_UNSPEC && table->family != family)
1341                         continue;
1342
1343                 ctx->family = table->family;
1344
1345                 if (!nft_is_active_next(ctx->net, table))
1346                         continue;
1347
1348                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1349                         continue;
1350
1351                 if (nla[NFTA_TABLE_NAME] &&
1352                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1353                         continue;
1354
1355                 ctx->table = table;
1356
1357                 err = nft_flush_table(ctx);
1358                 if (err < 0)
1359                         goto out;
1360         }
1361 out:
1362         return err;
1363 }
1364
1365 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1366                               const struct nlattr * const nla[])
1367 {
1368         struct netlink_ext_ack *extack = info->extack;
1369         u8 genmask = nft_genmask_next(info->net);
1370         u8 family = info->nfmsg->nfgen_family;
1371         struct net *net = info->net;
1372         const struct nlattr *attr;
1373         struct nft_table *table;
1374         struct nft_ctx ctx;
1375
1376         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1377         if (family == AF_UNSPEC ||
1378             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1379                 return nft_flush(&ctx, family);
1380
1381         if (nla[NFTA_TABLE_HANDLE]) {
1382                 attr = nla[NFTA_TABLE_HANDLE];
1383                 table = nft_table_lookup_byhandle(net, attr, genmask,
1384                                                   NETLINK_CB(skb).portid);
1385         } else {
1386                 attr = nla[NFTA_TABLE_NAME];
1387                 table = nft_table_lookup(net, attr, family, genmask,
1388                                          NETLINK_CB(skb).portid);
1389         }
1390
1391         if (IS_ERR(table)) {
1392                 NL_SET_BAD_ATTR(extack, attr);
1393                 return PTR_ERR(table);
1394         }
1395
1396         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1397             table->use > 0)
1398                 return -EBUSY;
1399
1400         ctx.family = family;
1401         ctx.table = table;
1402
1403         return nft_flush_table(&ctx);
1404 }
1405
1406 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1407 {
1408         if (WARN_ON(ctx->table->use > 0))
1409                 return;
1410
1411         rhltable_destroy(&ctx->table->chains_ht);
1412         kfree(ctx->table->name);
1413         kfree(ctx->table->udata);
1414         kfree(ctx->table);
1415 }
1416
1417 void nft_register_chain_type(const struct nft_chain_type *ctype)
1418 {
1419         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1420         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1421                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1422                 return;
1423         }
1424         chain_type[ctype->family][ctype->type] = ctype;
1425         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1426 }
1427 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1428
1429 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1430 {
1431         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1432         chain_type[ctype->family][ctype->type] = NULL;
1433         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1434 }
1435 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1436
1437 /*
1438  * Chains
1439  */
1440
1441 static struct nft_chain *
1442 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1443 {
1444         struct nft_chain *chain;
1445
1446         list_for_each_entry(chain, &table->chains, list) {
1447                 if (chain->handle == handle &&
1448                     nft_active_genmask(chain, genmask))
1449                         return chain;
1450         }
1451
1452         return ERR_PTR(-ENOENT);
1453 }
1454
1455 static bool lockdep_commit_lock_is_held(const struct net *net)
1456 {
1457 #ifdef CONFIG_PROVE_LOCKING
1458         struct nftables_pernet *nft_net = nft_pernet(net);
1459
1460         return lockdep_is_held(&nft_net->commit_mutex);
1461 #else
1462         return true;
1463 #endif
1464 }
1465
1466 static struct nft_chain *nft_chain_lookup(struct net *net,
1467                                           struct nft_table *table,
1468                                           const struct nlattr *nla, u8 genmask)
1469 {
1470         char search[NFT_CHAIN_MAXNAMELEN + 1];
1471         struct rhlist_head *tmp, *list;
1472         struct nft_chain *chain;
1473
1474         if (nla == NULL)
1475                 return ERR_PTR(-EINVAL);
1476
1477         nla_strscpy(search, nla, sizeof(search));
1478
1479         WARN_ON(!rcu_read_lock_held() &&
1480                 !lockdep_commit_lock_is_held(net));
1481
1482         chain = ERR_PTR(-ENOENT);
1483         rcu_read_lock();
1484         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1485         if (!list)
1486                 goto out_unlock;
1487
1488         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1489                 if (nft_active_genmask(chain, genmask))
1490                         goto out_unlock;
1491         }
1492         chain = ERR_PTR(-ENOENT);
1493 out_unlock:
1494         rcu_read_unlock();
1495         return chain;
1496 }
1497
1498 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1499         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1500                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1501         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1502         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1503                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1504         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1505         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1506         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1507                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1508         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1509         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1510         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1511         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1512                                     .len = NFT_USERDATA_MAXLEN },
1513 };
1514
1515 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1516         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1517         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1518         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1519                                     .len = IFNAMSIZ - 1 },
1520 };
1521
1522 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1523 {
1524         struct nft_stats *cpu_stats, total;
1525         struct nlattr *nest;
1526         unsigned int seq;
1527         u64 pkts, bytes;
1528         int cpu;
1529
1530         if (!stats)
1531                 return 0;
1532
1533         memset(&total, 0, sizeof(total));
1534         for_each_possible_cpu(cpu) {
1535                 cpu_stats = per_cpu_ptr(stats, cpu);
1536                 do {
1537                         seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1538                         pkts = cpu_stats->pkts;
1539                         bytes = cpu_stats->bytes;
1540                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1541                 total.pkts += pkts;
1542                 total.bytes += bytes;
1543         }
1544         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1545         if (nest == NULL)
1546                 goto nla_put_failure;
1547
1548         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1549                          NFTA_COUNTER_PAD) ||
1550             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1551                          NFTA_COUNTER_PAD))
1552                 goto nla_put_failure;
1553
1554         nla_nest_end(skb, nest);
1555         return 0;
1556
1557 nla_put_failure:
1558         return -ENOSPC;
1559 }
1560
1561 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1562                                    const struct nft_base_chain *basechain)
1563 {
1564         const struct nf_hook_ops *ops = &basechain->ops;
1565         struct nft_hook *hook, *first = NULL;
1566         struct nlattr *nest, *nest_devs;
1567         int n = 0;
1568
1569         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1570         if (nest == NULL)
1571                 goto nla_put_failure;
1572         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1573                 goto nla_put_failure;
1574         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1575                 goto nla_put_failure;
1576
1577         if (nft_base_chain_netdev(family, ops->hooknum)) {
1578                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1579                 list_for_each_entry(hook, &basechain->hook_list, list) {
1580                         if (!first)
1581                                 first = hook;
1582
1583                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1584                                            hook->ops.dev->name))
1585                                 goto nla_put_failure;
1586                         n++;
1587                 }
1588                 nla_nest_end(skb, nest_devs);
1589
1590                 if (n == 1 &&
1591                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1592                         goto nla_put_failure;
1593         }
1594         nla_nest_end(skb, nest);
1595
1596         return 0;
1597 nla_put_failure:
1598         return -1;
1599 }
1600
1601 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1602                                      u32 portid, u32 seq, int event, u32 flags,
1603                                      int family, const struct nft_table *table,
1604                                      const struct nft_chain *chain)
1605 {
1606         struct nlmsghdr *nlh;
1607
1608         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1609         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1610                            NFNETLINK_V0, nft_base_seq(net));
1611         if (!nlh)
1612                 goto nla_put_failure;
1613
1614         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1615                 goto nla_put_failure;
1616         if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1617                          NFTA_CHAIN_PAD))
1618                 goto nla_put_failure;
1619         if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1620                 goto nla_put_failure;
1621
1622         if (nft_is_base_chain(chain)) {
1623                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1624                 struct nft_stats __percpu *stats;
1625
1626                 if (nft_dump_basechain_hook(skb, family, basechain))
1627                         goto nla_put_failure;
1628
1629                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1630                                  htonl(basechain->policy)))
1631                         goto nla_put_failure;
1632
1633                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1634                         goto nla_put_failure;
1635
1636                 stats = rcu_dereference_check(basechain->stats,
1637                                               lockdep_commit_lock_is_held(net));
1638                 if (nft_dump_stats(skb, stats))
1639                         goto nla_put_failure;
1640         }
1641
1642         if (chain->flags &&
1643             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1644                 goto nla_put_failure;
1645
1646         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1647                 goto nla_put_failure;
1648
1649         if (chain->udata &&
1650             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1651                 goto nla_put_failure;
1652
1653         nlmsg_end(skb, nlh);
1654         return 0;
1655
1656 nla_put_failure:
1657         nlmsg_trim(skb, nlh);
1658         return -1;
1659 }
1660
1661 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1662 {
1663         struct nftables_pernet *nft_net;
1664         struct sk_buff *skb;
1665         u16 flags = 0;
1666         int err;
1667
1668         if (!ctx->report &&
1669             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1670                 return;
1671
1672         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1673         if (skb == NULL)
1674                 goto err;
1675
1676         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1677                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1678
1679         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1680                                         event, flags, ctx->family, ctx->table,
1681                                         ctx->chain);
1682         if (err < 0) {
1683                 kfree_skb(skb);
1684                 goto err;
1685         }
1686
1687         nft_net = nft_pernet(ctx->net);
1688         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1689         return;
1690 err:
1691         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1692 }
1693
1694 static int nf_tables_dump_chains(struct sk_buff *skb,
1695                                  struct netlink_callback *cb)
1696 {
1697         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1698         unsigned int idx = 0, s_idx = cb->args[0];
1699         struct net *net = sock_net(skb->sk);
1700         int family = nfmsg->nfgen_family;
1701         struct nftables_pernet *nft_net;
1702         const struct nft_table *table;
1703         const struct nft_chain *chain;
1704
1705         rcu_read_lock();
1706         nft_net = nft_pernet(net);
1707         cb->seq = nft_net->base_seq;
1708
1709         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1710                 if (family != NFPROTO_UNSPEC && family != table->family)
1711                         continue;
1712
1713                 list_for_each_entry_rcu(chain, &table->chains, list) {
1714                         if (idx < s_idx)
1715                                 goto cont;
1716                         if (idx > s_idx)
1717                                 memset(&cb->args[1], 0,
1718                                        sizeof(cb->args) - sizeof(cb->args[0]));
1719                         if (!nft_is_active(net, chain))
1720                                 continue;
1721                         if (nf_tables_fill_chain_info(skb, net,
1722                                                       NETLINK_CB(cb->skb).portid,
1723                                                       cb->nlh->nlmsg_seq,
1724                                                       NFT_MSG_NEWCHAIN,
1725                                                       NLM_F_MULTI,
1726                                                       table->family, table,
1727                                                       chain) < 0)
1728                                 goto done;
1729
1730                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1731 cont:
1732                         idx++;
1733                 }
1734         }
1735 done:
1736         rcu_read_unlock();
1737         cb->args[0] = idx;
1738         return skb->len;
1739 }
1740
1741 /* called with rcu_read_lock held */
1742 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1743                               const struct nlattr * const nla[])
1744 {
1745         struct netlink_ext_ack *extack = info->extack;
1746         u8 genmask = nft_genmask_cur(info->net);
1747         u8 family = info->nfmsg->nfgen_family;
1748         const struct nft_chain *chain;
1749         struct net *net = info->net;
1750         struct nft_table *table;
1751         struct sk_buff *skb2;
1752         int err;
1753
1754         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1755                 struct netlink_dump_control c = {
1756                         .dump = nf_tables_dump_chains,
1757                         .module = THIS_MODULE,
1758                 };
1759
1760                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1761         }
1762
1763         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1764         if (IS_ERR(table)) {
1765                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1766                 return PTR_ERR(table);
1767         }
1768
1769         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1770         if (IS_ERR(chain)) {
1771                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1772                 return PTR_ERR(chain);
1773         }
1774
1775         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1776         if (!skb2)
1777                 return -ENOMEM;
1778
1779         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1780                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1781                                         0, family, table, chain);
1782         if (err < 0)
1783                 goto err_fill_chain_info;
1784
1785         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1786
1787 err_fill_chain_info:
1788         kfree_skb(skb2);
1789         return err;
1790 }
1791
1792 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1793         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1794         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1795 };
1796
1797 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1798 {
1799         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1800         struct nft_stats __percpu *newstats;
1801         struct nft_stats *stats;
1802         int err;
1803
1804         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1805                                           nft_counter_policy, NULL);
1806         if (err < 0)
1807                 return ERR_PTR(err);
1808
1809         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1810                 return ERR_PTR(-EINVAL);
1811
1812         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1813         if (newstats == NULL)
1814                 return ERR_PTR(-ENOMEM);
1815
1816         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1817          * are not exposed to userspace.
1818          */
1819         preempt_disable();
1820         stats = this_cpu_ptr(newstats);
1821         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1822         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1823         preempt_enable();
1824
1825         return newstats;
1826 }
1827
1828 static void nft_chain_stats_replace(struct nft_trans *trans)
1829 {
1830         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1831
1832         if (!nft_trans_chain_stats(trans))
1833                 return;
1834
1835         nft_trans_chain_stats(trans) =
1836                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1837                                     lockdep_commit_lock_is_held(trans->ctx.net));
1838
1839         if (!nft_trans_chain_stats(trans))
1840                 static_branch_inc(&nft_counters_enabled);
1841 }
1842
1843 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1844 {
1845         struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
1846         struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
1847
1848         if (g0 != g1)
1849                 kvfree(g1);
1850         kvfree(g0);
1851
1852         /* should be NULL either via abort or via successful commit */
1853         WARN_ON_ONCE(chain->blob_next);
1854         kvfree(chain->blob_next);
1855 }
1856
1857 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1858 {
1859         struct nft_chain *chain = ctx->chain;
1860         struct nft_hook *hook, *next;
1861
1862         if (WARN_ON(chain->use > 0))
1863                 return;
1864
1865         /* no concurrent access possible anymore */
1866         nf_tables_chain_free_chain_rules(chain);
1867
1868         if (nft_is_base_chain(chain)) {
1869                 struct nft_base_chain *basechain = nft_base_chain(chain);
1870
1871                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1872                         list_for_each_entry_safe(hook, next,
1873                                                  &basechain->hook_list, list) {
1874                                 list_del_rcu(&hook->list);
1875                                 kfree_rcu(hook, rcu);
1876                         }
1877                 }
1878                 module_put(basechain->type->owner);
1879                 if (rcu_access_pointer(basechain->stats)) {
1880                         static_branch_dec(&nft_counters_enabled);
1881                         free_percpu(rcu_dereference_raw(basechain->stats));
1882                 }
1883                 kfree(chain->name);
1884                 kfree(chain->udata);
1885                 kfree(basechain);
1886         } else {
1887                 kfree(chain->name);
1888                 kfree(chain->udata);
1889                 kfree(chain);
1890         }
1891 }
1892
1893 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1894                                               const struct nlattr *attr)
1895 {
1896         struct net_device *dev;
1897         char ifname[IFNAMSIZ];
1898         struct nft_hook *hook;
1899         int err;
1900
1901         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
1902         if (!hook) {
1903                 err = -ENOMEM;
1904                 goto err_hook_alloc;
1905         }
1906
1907         nla_strscpy(ifname, attr, IFNAMSIZ);
1908         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1909          * indirectly serializing all the other holders of the commit_mutex with
1910          * the rtnl_mutex.
1911          */
1912         dev = __dev_get_by_name(net, ifname);
1913         if (!dev) {
1914                 err = -ENOENT;
1915                 goto err_hook_dev;
1916         }
1917         hook->ops.dev = dev;
1918
1919         return hook;
1920
1921 err_hook_dev:
1922         kfree(hook);
1923 err_hook_alloc:
1924         return ERR_PTR(err);
1925 }
1926
1927 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1928                                            const struct nft_hook *this)
1929 {
1930         struct nft_hook *hook;
1931
1932         list_for_each_entry(hook, hook_list, list) {
1933                 if (this->ops.dev == hook->ops.dev)
1934                         return hook;
1935         }
1936
1937         return NULL;
1938 }
1939
1940 static int nf_tables_parse_netdev_hooks(struct net *net,
1941                                         const struct nlattr *attr,
1942                                         struct list_head *hook_list)
1943 {
1944         struct nft_hook *hook, *next;
1945         const struct nlattr *tmp;
1946         int rem, n = 0, err;
1947
1948         nla_for_each_nested(tmp, attr, rem) {
1949                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1950                         err = -EINVAL;
1951                         goto err_hook;
1952                 }
1953
1954                 hook = nft_netdev_hook_alloc(net, tmp);
1955                 if (IS_ERR(hook)) {
1956                         err = PTR_ERR(hook);
1957                         goto err_hook;
1958                 }
1959                 if (nft_hook_list_find(hook_list, hook)) {
1960                         kfree(hook);
1961                         err = -EEXIST;
1962                         goto err_hook;
1963                 }
1964                 list_add_tail(&hook->list, hook_list);
1965                 n++;
1966
1967                 if (n == NFT_NETDEVICE_MAX) {
1968                         err = -EFBIG;
1969                         goto err_hook;
1970                 }
1971         }
1972
1973         return 0;
1974
1975 err_hook:
1976         list_for_each_entry_safe(hook, next, hook_list, list) {
1977                 list_del(&hook->list);
1978                 kfree(hook);
1979         }
1980         return err;
1981 }
1982
1983 struct nft_chain_hook {
1984         u32                             num;
1985         s32                             priority;
1986         const struct nft_chain_type     *type;
1987         struct list_head                list;
1988 };
1989
1990 static int nft_chain_parse_netdev(struct net *net,
1991                                   struct nlattr *tb[],
1992                                   struct list_head *hook_list)
1993 {
1994         struct nft_hook *hook;
1995         int err;
1996
1997         if (tb[NFTA_HOOK_DEV]) {
1998                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1999                 if (IS_ERR(hook))
2000                         return PTR_ERR(hook);
2001
2002                 list_add_tail(&hook->list, hook_list);
2003         } else if (tb[NFTA_HOOK_DEVS]) {
2004                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2005                                                    hook_list);
2006                 if (err < 0)
2007                         return err;
2008
2009                 if (list_empty(hook_list))
2010                         return -EINVAL;
2011         } else {
2012                 return -EINVAL;
2013         }
2014
2015         return 0;
2016 }
2017
2018 static int nft_chain_parse_hook(struct net *net,
2019                                 const struct nlattr * const nla[],
2020                                 struct nft_chain_hook *hook, u8 family,
2021                                 struct netlink_ext_ack *extack, bool autoload)
2022 {
2023         struct nftables_pernet *nft_net = nft_pernet(net);
2024         struct nlattr *ha[NFTA_HOOK_MAX + 1];
2025         const struct nft_chain_type *type;
2026         int err;
2027
2028         lockdep_assert_held(&nft_net->commit_mutex);
2029         lockdep_nfnl_nft_mutex_not_held();
2030
2031         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2032                                           nla[NFTA_CHAIN_HOOK],
2033                                           nft_hook_policy, NULL);
2034         if (err < 0)
2035                 return err;
2036
2037         if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
2038             ha[NFTA_HOOK_PRIORITY] == NULL)
2039                 return -EINVAL;
2040
2041         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2042         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2043
2044         type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2045         if (!type)
2046                 return -EOPNOTSUPP;
2047
2048         if (nla[NFTA_CHAIN_TYPE]) {
2049                 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2050                                                    family, autoload);
2051                 if (IS_ERR(type)) {
2052                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2053                         return PTR_ERR(type);
2054                 }
2055         }
2056         if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2057                 return -EOPNOTSUPP;
2058
2059         if (type->type == NFT_CHAIN_T_NAT &&
2060             hook->priority <= NF_IP_PRI_CONNTRACK)
2061                 return -EOPNOTSUPP;
2062
2063         if (!try_module_get(type->owner)) {
2064                 if (nla[NFTA_CHAIN_TYPE])
2065                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2066                 return -ENOENT;
2067         }
2068
2069         hook->type = type;
2070
2071         INIT_LIST_HEAD(&hook->list);
2072         if (nft_base_chain_netdev(family, hook->num)) {
2073                 err = nft_chain_parse_netdev(net, ha, &hook->list);
2074                 if (err < 0) {
2075                         module_put(type->owner);
2076                         return err;
2077                 }
2078         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2079                 module_put(type->owner);
2080                 return -EOPNOTSUPP;
2081         }
2082
2083         return 0;
2084 }
2085
2086 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2087 {
2088         struct nft_hook *h, *next;
2089
2090         list_for_each_entry_safe(h, next, &hook->list, list) {
2091                 list_del(&h->list);
2092                 kfree(h);
2093         }
2094         module_put(hook->type->owner);
2095 }
2096
2097 struct nft_rules_old {
2098         struct rcu_head h;
2099         struct nft_rule_blob *blob;
2100 };
2101
2102 static void nft_last_rule(struct nft_rule_blob *blob, const void *ptr)
2103 {
2104         struct nft_rule_dp *prule;
2105
2106         prule = (struct nft_rule_dp *)ptr;
2107         prule->is_last = 1;
2108         /* blob size does not include the trailer rule */
2109 }
2110
2111 static struct nft_rule_blob *nf_tables_chain_alloc_rules(unsigned int size)
2112 {
2113         struct nft_rule_blob *blob;
2114
2115         /* size must include room for the last rule */
2116         if (size < offsetof(struct nft_rule_dp, data))
2117                 return NULL;
2118
2119         size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rules_old);
2120         if (size > INT_MAX)
2121                 return NULL;
2122
2123         blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2124         if (!blob)
2125                 return NULL;
2126
2127         blob->size = 0;
2128         nft_last_rule(blob, blob->data);
2129
2130         return blob;
2131 }
2132
2133 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2134                                     const struct nft_chain_hook *hook,
2135                                     struct nft_chain *chain)
2136 {
2137         ops->pf                 = family;
2138         ops->hooknum            = hook->num;
2139         ops->priority           = hook->priority;
2140         ops->priv               = chain;
2141         ops->hook               = hook->type->hooks[ops->hooknum];
2142         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2143 }
2144
2145 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2146                               struct nft_chain_hook *hook, u32 flags)
2147 {
2148         struct nft_chain *chain;
2149         struct nft_hook *h;
2150
2151         basechain->type = hook->type;
2152         INIT_LIST_HEAD(&basechain->hook_list);
2153         chain = &basechain->chain;
2154
2155         if (nft_base_chain_netdev(family, hook->num)) {
2156                 list_splice_init(&hook->list, &basechain->hook_list);
2157                 list_for_each_entry(h, &basechain->hook_list, list)
2158                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2159
2160                 basechain->ops.hooknum  = hook->num;
2161                 basechain->ops.priority = hook->priority;
2162         } else {
2163                 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2164         }
2165
2166         chain->flags |= NFT_CHAIN_BASE | flags;
2167         basechain->policy = NF_ACCEPT;
2168         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2169             !nft_chain_offload_support(basechain))
2170                 return -EOPNOTSUPP;
2171
2172         flow_block_init(&basechain->flow_block);
2173
2174         return 0;
2175 }
2176
2177 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2178 {
2179         int err;
2180
2181         err = rhltable_insert_key(&table->chains_ht, chain->name,
2182                                   &chain->rhlhead, nft_chain_ht_params);
2183         if (err)
2184                 return err;
2185
2186         list_add_tail_rcu(&chain->list, &table->chains);
2187
2188         return 0;
2189 }
2190
2191 static u64 chain_id;
2192
2193 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2194                               u8 policy, u32 flags,
2195                               struct netlink_ext_ack *extack)
2196 {
2197         const struct nlattr * const *nla = ctx->nla;
2198         struct nft_table *table = ctx->table;
2199         struct nft_base_chain *basechain;
2200         struct nft_stats __percpu *stats;
2201         struct net *net = ctx->net;
2202         char name[NFT_NAME_MAXLEN];
2203         struct nft_rule_blob *blob;
2204         struct nft_trans *trans;
2205         struct nft_chain *chain;
2206         unsigned int data_size;
2207         int err;
2208
2209         if (table->use == UINT_MAX)
2210                 return -EOVERFLOW;
2211
2212         if (nla[NFTA_CHAIN_HOOK]) {
2213                 struct nft_chain_hook hook;
2214
2215                 if (flags & NFT_CHAIN_BINDING)
2216                         return -EOPNOTSUPP;
2217
2218                 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2219                                            true);
2220                 if (err < 0)
2221                         return err;
2222
2223                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2224                 if (basechain == NULL) {
2225                         nft_chain_release_hook(&hook);
2226                         return -ENOMEM;
2227                 }
2228                 chain = &basechain->chain;
2229
2230                 if (nla[NFTA_CHAIN_COUNTERS]) {
2231                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2232                         if (IS_ERR(stats)) {
2233                                 nft_chain_release_hook(&hook);
2234                                 kfree(basechain);
2235                                 return PTR_ERR(stats);
2236                         }
2237                         rcu_assign_pointer(basechain->stats, stats);
2238                         static_branch_inc(&nft_counters_enabled);
2239                 }
2240
2241                 err = nft_basechain_init(basechain, family, &hook, flags);
2242                 if (err < 0) {
2243                         nft_chain_release_hook(&hook);
2244                         kfree(basechain);
2245                         return err;
2246                 }
2247         } else {
2248                 if (flags & NFT_CHAIN_BASE)
2249                         return -EINVAL;
2250                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2251                         return -EOPNOTSUPP;
2252
2253                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2254                 if (chain == NULL)
2255                         return -ENOMEM;
2256
2257                 chain->flags = flags;
2258         }
2259         ctx->chain = chain;
2260
2261         INIT_LIST_HEAD(&chain->rules);
2262         chain->handle = nf_tables_alloc_handle(table);
2263         chain->table = table;
2264
2265         if (nla[NFTA_CHAIN_NAME]) {
2266                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2267         } else {
2268                 if (!(flags & NFT_CHAIN_BINDING)) {
2269                         err = -EINVAL;
2270                         goto err_destroy_chain;
2271                 }
2272
2273                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2274                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2275         }
2276
2277         if (!chain->name) {
2278                 err = -ENOMEM;
2279                 goto err_destroy_chain;
2280         }
2281
2282         if (nla[NFTA_CHAIN_USERDATA]) {
2283                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2284                 if (chain->udata == NULL) {
2285                         err = -ENOMEM;
2286                         goto err_destroy_chain;
2287                 }
2288                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2289         }
2290
2291         data_size = offsetof(struct nft_rule_dp, data); /* last rule */
2292         blob = nf_tables_chain_alloc_rules(data_size);
2293         if (!blob) {
2294                 err = -ENOMEM;
2295                 goto err_destroy_chain;
2296         }
2297
2298         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2299         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2300
2301         err = nf_tables_register_hook(net, table, chain);
2302         if (err < 0)
2303                 goto err_destroy_chain;
2304
2305         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2306         if (IS_ERR(trans)) {
2307                 err = PTR_ERR(trans);
2308                 goto err_unregister_hook;
2309         }
2310
2311         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2312         if (nft_is_base_chain(chain))
2313                 nft_trans_chain_policy(trans) = policy;
2314
2315         err = nft_chain_add(table, chain);
2316         if (err < 0) {
2317                 nft_trans_destroy(trans);
2318                 goto err_unregister_hook;
2319         }
2320
2321         table->use++;
2322
2323         return 0;
2324 err_unregister_hook:
2325         nf_tables_unregister_hook(net, table, chain);
2326 err_destroy_chain:
2327         nf_tables_chain_destroy(ctx);
2328
2329         return err;
2330 }
2331
2332 static bool nft_hook_list_equal(struct list_head *hook_list1,
2333                                 struct list_head *hook_list2)
2334 {
2335         struct nft_hook *hook;
2336         int n = 0, m = 0;
2337
2338         n = 0;
2339         list_for_each_entry(hook, hook_list2, list) {
2340                 if (!nft_hook_list_find(hook_list1, hook))
2341                         return false;
2342
2343                 n++;
2344         }
2345         list_for_each_entry(hook, hook_list1, list)
2346                 m++;
2347
2348         return n == m;
2349 }
2350
2351 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2352                               u32 flags, const struct nlattr *attr,
2353                               struct netlink_ext_ack *extack)
2354 {
2355         const struct nlattr * const *nla = ctx->nla;
2356         struct nft_table *table = ctx->table;
2357         struct nft_chain *chain = ctx->chain;
2358         struct nft_base_chain *basechain;
2359         struct nft_stats *stats = NULL;
2360         struct nft_chain_hook hook;
2361         struct nf_hook_ops *ops;
2362         struct nft_trans *trans;
2363         int err;
2364
2365         if (chain->flags ^ flags)
2366                 return -EOPNOTSUPP;
2367
2368         if (nla[NFTA_CHAIN_HOOK]) {
2369                 if (!nft_is_base_chain(chain)) {
2370                         NL_SET_BAD_ATTR(extack, attr);
2371                         return -EEXIST;
2372                 }
2373                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2374                                            extack, false);
2375                 if (err < 0)
2376                         return err;
2377
2378                 basechain = nft_base_chain(chain);
2379                 if (basechain->type != hook.type) {
2380                         nft_chain_release_hook(&hook);
2381                         NL_SET_BAD_ATTR(extack, attr);
2382                         return -EEXIST;
2383                 }
2384
2385                 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2386                         if (!nft_hook_list_equal(&basechain->hook_list,
2387                                                  &hook.list)) {
2388                                 nft_chain_release_hook(&hook);
2389                                 NL_SET_BAD_ATTR(extack, attr);
2390                                 return -EEXIST;
2391                         }
2392                 } else {
2393                         ops = &basechain->ops;
2394                         if (ops->hooknum != hook.num ||
2395                             ops->priority != hook.priority) {
2396                                 nft_chain_release_hook(&hook);
2397                                 NL_SET_BAD_ATTR(extack, attr);
2398                                 return -EEXIST;
2399                         }
2400                 }
2401                 nft_chain_release_hook(&hook);
2402         }
2403
2404         if (nla[NFTA_CHAIN_HANDLE] &&
2405             nla[NFTA_CHAIN_NAME]) {
2406                 struct nft_chain *chain2;
2407
2408                 chain2 = nft_chain_lookup(ctx->net, table,
2409                                           nla[NFTA_CHAIN_NAME], genmask);
2410                 if (!IS_ERR(chain2)) {
2411                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2412                         return -EEXIST;
2413                 }
2414         }
2415
2416         if (nla[NFTA_CHAIN_COUNTERS]) {
2417                 if (!nft_is_base_chain(chain))
2418                         return -EOPNOTSUPP;
2419
2420                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2421                 if (IS_ERR(stats))
2422                         return PTR_ERR(stats);
2423         }
2424
2425         err = -ENOMEM;
2426         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2427                                 sizeof(struct nft_trans_chain));
2428         if (trans == NULL)
2429                 goto err;
2430
2431         nft_trans_chain_stats(trans) = stats;
2432         nft_trans_chain_update(trans) = true;
2433
2434         if (nla[NFTA_CHAIN_POLICY])
2435                 nft_trans_chain_policy(trans) = policy;
2436         else
2437                 nft_trans_chain_policy(trans) = -1;
2438
2439         if (nla[NFTA_CHAIN_HANDLE] &&
2440             nla[NFTA_CHAIN_NAME]) {
2441                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2442                 struct nft_trans *tmp;
2443                 char *name;
2444
2445                 err = -ENOMEM;
2446                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2447                 if (!name)
2448                         goto err;
2449
2450                 err = -EEXIST;
2451                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2452                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2453                             tmp->ctx.table == table &&
2454                             nft_trans_chain_update(tmp) &&
2455                             nft_trans_chain_name(tmp) &&
2456                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2457                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2458                                 kfree(name);
2459                                 goto err;
2460                         }
2461                 }
2462
2463                 nft_trans_chain_name(trans) = name;
2464         }
2465         nft_trans_commit_list_add_tail(ctx->net, trans);
2466
2467         return 0;
2468 err:
2469         free_percpu(stats);
2470         kfree(trans);
2471         return err;
2472 }
2473
2474 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2475                                                const struct nlattr *nla)
2476 {
2477         struct nftables_pernet *nft_net = nft_pernet(net);
2478         u32 id = ntohl(nla_get_be32(nla));
2479         struct nft_trans *trans;
2480
2481         list_for_each_entry(trans, &nft_net->commit_list, list) {
2482                 struct nft_chain *chain = trans->ctx.chain;
2483
2484                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2485                     id == nft_trans_chain_id(trans))
2486                         return chain;
2487         }
2488         return ERR_PTR(-ENOENT);
2489 }
2490
2491 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2492                               const struct nlattr * const nla[])
2493 {
2494         struct nftables_pernet *nft_net = nft_pernet(info->net);
2495         struct netlink_ext_ack *extack = info->extack;
2496         u8 genmask = nft_genmask_next(info->net);
2497         u8 family = info->nfmsg->nfgen_family;
2498         struct nft_chain *chain = NULL;
2499         struct net *net = info->net;
2500         const struct nlattr *attr;
2501         struct nft_table *table;
2502         u8 policy = NF_ACCEPT;
2503         struct nft_ctx ctx;
2504         u64 handle = 0;
2505         u32 flags = 0;
2506
2507         lockdep_assert_held(&nft_net->commit_mutex);
2508
2509         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2510                                  NETLINK_CB(skb).portid);
2511         if (IS_ERR(table)) {
2512                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2513                 return PTR_ERR(table);
2514         }
2515
2516         chain = NULL;
2517         attr = nla[NFTA_CHAIN_NAME];
2518
2519         if (nla[NFTA_CHAIN_HANDLE]) {
2520                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2521                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2522                 if (IS_ERR(chain)) {
2523                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2524                         return PTR_ERR(chain);
2525                 }
2526                 attr = nla[NFTA_CHAIN_HANDLE];
2527         } else if (nla[NFTA_CHAIN_NAME]) {
2528                 chain = nft_chain_lookup(net, table, attr, genmask);
2529                 if (IS_ERR(chain)) {
2530                         if (PTR_ERR(chain) != -ENOENT) {
2531                                 NL_SET_BAD_ATTR(extack, attr);
2532                                 return PTR_ERR(chain);
2533                         }
2534                         chain = NULL;
2535                 }
2536         } else if (!nla[NFTA_CHAIN_ID]) {
2537                 return -EINVAL;
2538         }
2539
2540         if (nla[NFTA_CHAIN_POLICY]) {
2541                 if (chain != NULL &&
2542                     !nft_is_base_chain(chain)) {
2543                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2544                         return -EOPNOTSUPP;
2545                 }
2546
2547                 if (chain == NULL &&
2548                     nla[NFTA_CHAIN_HOOK] == NULL) {
2549                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2550                         return -EOPNOTSUPP;
2551                 }
2552
2553                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2554                 switch (policy) {
2555                 case NF_DROP:
2556                 case NF_ACCEPT:
2557                         break;
2558                 default:
2559                         return -EINVAL;
2560                 }
2561         }
2562
2563         if (nla[NFTA_CHAIN_FLAGS])
2564                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2565         else if (chain)
2566                 flags = chain->flags;
2567
2568         if (flags & ~NFT_CHAIN_FLAGS)
2569                 return -EOPNOTSUPP;
2570
2571         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2572
2573         if (chain != NULL) {
2574                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2575                         NL_SET_BAD_ATTR(extack, attr);
2576                         return -EEXIST;
2577                 }
2578                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2579                         return -EOPNOTSUPP;
2580
2581                 flags |= chain->flags & NFT_CHAIN_BASE;
2582                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2583                                           extack);
2584         }
2585
2586         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2587 }
2588
2589 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2590                               const struct nlattr * const nla[])
2591 {
2592         struct netlink_ext_ack *extack = info->extack;
2593         u8 genmask = nft_genmask_next(info->net);
2594         u8 family = info->nfmsg->nfgen_family;
2595         struct net *net = info->net;
2596         const struct nlattr *attr;
2597         struct nft_table *table;
2598         struct nft_chain *chain;
2599         struct nft_rule *rule;
2600         struct nft_ctx ctx;
2601         u64 handle;
2602         u32 use;
2603         int err;
2604
2605         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2606                                  NETLINK_CB(skb).portid);
2607         if (IS_ERR(table)) {
2608                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2609                 return PTR_ERR(table);
2610         }
2611
2612         if (nla[NFTA_CHAIN_HANDLE]) {
2613                 attr = nla[NFTA_CHAIN_HANDLE];
2614                 handle = be64_to_cpu(nla_get_be64(attr));
2615                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2616         } else {
2617                 attr = nla[NFTA_CHAIN_NAME];
2618                 chain = nft_chain_lookup(net, table, attr, genmask);
2619         }
2620         if (IS_ERR(chain)) {
2621                 NL_SET_BAD_ATTR(extack, attr);
2622                 return PTR_ERR(chain);
2623         }
2624
2625         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2626             chain->use > 0)
2627                 return -EBUSY;
2628
2629         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2630
2631         use = chain->use;
2632         list_for_each_entry(rule, &chain->rules, list) {
2633                 if (!nft_is_active_next(net, rule))
2634                         continue;
2635                 use--;
2636
2637                 err = nft_delrule(&ctx, rule);
2638                 if (err < 0)
2639                         return err;
2640         }
2641
2642         /* There are rules and elements that are still holding references to us,
2643          * we cannot do a recursive removal in this case.
2644          */
2645         if (use > 0) {
2646                 NL_SET_BAD_ATTR(extack, attr);
2647                 return -EBUSY;
2648         }
2649
2650         return nft_delchain(&ctx);
2651 }
2652
2653 /*
2654  * Expressions
2655  */
2656
2657 /**
2658  *      nft_register_expr - register nf_tables expr type
2659  *      @type: expr type
2660  *
2661  *      Registers the expr type for use with nf_tables. Returns zero on
2662  *      success or a negative errno code otherwise.
2663  */
2664 int nft_register_expr(struct nft_expr_type *type)
2665 {
2666         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2667         if (type->family == NFPROTO_UNSPEC)
2668                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2669         else
2670                 list_add_rcu(&type->list, &nf_tables_expressions);
2671         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2672         return 0;
2673 }
2674 EXPORT_SYMBOL_GPL(nft_register_expr);
2675
2676 /**
2677  *      nft_unregister_expr - unregister nf_tables expr type
2678  *      @type: expr type
2679  *
2680  *      Unregisters the expr typefor use with nf_tables.
2681  */
2682 void nft_unregister_expr(struct nft_expr_type *type)
2683 {
2684         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2685         list_del_rcu(&type->list);
2686         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2687 }
2688 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2689
2690 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2691                                                        struct nlattr *nla)
2692 {
2693         const struct nft_expr_type *type, *candidate = NULL;
2694
2695         list_for_each_entry(type, &nf_tables_expressions, list) {
2696                 if (!nla_strcmp(nla, type->name)) {
2697                         if (!type->family && !candidate)
2698                                 candidate = type;
2699                         else if (type->family == family)
2700                                 candidate = type;
2701                 }
2702         }
2703         return candidate;
2704 }
2705
2706 #ifdef CONFIG_MODULES
2707 static int nft_expr_type_request_module(struct net *net, u8 family,
2708                                         struct nlattr *nla)
2709 {
2710         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2711                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2712                 return -EAGAIN;
2713
2714         return 0;
2715 }
2716 #endif
2717
2718 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2719                                                      u8 family,
2720                                                      struct nlattr *nla)
2721 {
2722         const struct nft_expr_type *type;
2723
2724         if (nla == NULL)
2725                 return ERR_PTR(-EINVAL);
2726
2727         type = __nft_expr_type_get(family, nla);
2728         if (type != NULL && try_module_get(type->owner))
2729                 return type;
2730
2731         lockdep_nfnl_nft_mutex_not_held();
2732 #ifdef CONFIG_MODULES
2733         if (type == NULL) {
2734                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2735                         return ERR_PTR(-EAGAIN);
2736
2737                 if (nft_request_module(net, "nft-expr-%.*s",
2738                                        nla_len(nla),
2739                                        (char *)nla_data(nla)) == -EAGAIN)
2740                         return ERR_PTR(-EAGAIN);
2741         }
2742 #endif
2743         return ERR_PTR(-ENOENT);
2744 }
2745
2746 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2747         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2748                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2749         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2750 };
2751
2752 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2753                                     const struct nft_expr *expr)
2754 {
2755         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2756                 goto nla_put_failure;
2757
2758         if (expr->ops->dump) {
2759                 struct nlattr *data = nla_nest_start_noflag(skb,
2760                                                             NFTA_EXPR_DATA);
2761                 if (data == NULL)
2762                         goto nla_put_failure;
2763                 if (expr->ops->dump(skb, expr) < 0)
2764                         goto nla_put_failure;
2765                 nla_nest_end(skb, data);
2766         }
2767
2768         return skb->len;
2769
2770 nla_put_failure:
2771         return -1;
2772 };
2773
2774 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2775                   const struct nft_expr *expr)
2776 {
2777         struct nlattr *nest;
2778
2779         nest = nla_nest_start_noflag(skb, attr);
2780         if (!nest)
2781                 goto nla_put_failure;
2782         if (nf_tables_fill_expr_info(skb, expr) < 0)
2783                 goto nla_put_failure;
2784         nla_nest_end(skb, nest);
2785         return 0;
2786
2787 nla_put_failure:
2788         return -1;
2789 }
2790
2791 struct nft_expr_info {
2792         const struct nft_expr_ops       *ops;
2793         const struct nlattr             *attr;
2794         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2795 };
2796
2797 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2798                                 const struct nlattr *nla,
2799                                 struct nft_expr_info *info)
2800 {
2801         const struct nft_expr_type *type;
2802         const struct nft_expr_ops *ops;
2803         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2804         int err;
2805
2806         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2807                                           nft_expr_policy, NULL);
2808         if (err < 0)
2809                 return err;
2810
2811         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2812         if (IS_ERR(type))
2813                 return PTR_ERR(type);
2814
2815         if (tb[NFTA_EXPR_DATA]) {
2816                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2817                                                   tb[NFTA_EXPR_DATA],
2818                                                   type->policy, NULL);
2819                 if (err < 0)
2820                         goto err1;
2821         } else
2822                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2823
2824         if (type->select_ops != NULL) {
2825                 ops = type->select_ops(ctx,
2826                                        (const struct nlattr * const *)info->tb);
2827                 if (IS_ERR(ops)) {
2828                         err = PTR_ERR(ops);
2829 #ifdef CONFIG_MODULES
2830                         if (err == -EAGAIN)
2831                                 if (nft_expr_type_request_module(ctx->net,
2832                                                                  ctx->family,
2833                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2834                                         err = -ENOENT;
2835 #endif
2836                         goto err1;
2837                 }
2838         } else
2839                 ops = type->ops;
2840
2841         info->attr = nla;
2842         info->ops = ops;
2843
2844         return 0;
2845
2846 err1:
2847         module_put(type->owner);
2848         return err;
2849 }
2850
2851 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2852                              const struct nft_expr_info *expr_info,
2853                              struct nft_expr *expr)
2854 {
2855         const struct nft_expr_ops *ops = expr_info->ops;
2856         int err;
2857
2858         expr->ops = ops;
2859         if (ops->init) {
2860                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2861                 if (err < 0)
2862                         goto err1;
2863         }
2864
2865         return 0;
2866 err1:
2867         expr->ops = NULL;
2868         return err;
2869 }
2870
2871 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2872                                    struct nft_expr *expr)
2873 {
2874         const struct nft_expr_type *type = expr->ops->type;
2875
2876         if (expr->ops->destroy)
2877                 expr->ops->destroy(ctx, expr);
2878         module_put(type->owner);
2879 }
2880
2881 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2882                                       const struct nlattr *nla)
2883 {
2884         struct nft_expr_info expr_info;
2885         struct nft_expr *expr;
2886         struct module *owner;
2887         int err;
2888
2889         err = nf_tables_expr_parse(ctx, nla, &expr_info);
2890         if (err < 0)
2891                 goto err_expr_parse;
2892
2893         err = -EOPNOTSUPP;
2894         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
2895                 goto err_expr_stateful;
2896
2897         err = -ENOMEM;
2898         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
2899         if (expr == NULL)
2900                 goto err_expr_stateful;
2901
2902         err = nf_tables_newexpr(ctx, &expr_info, expr);
2903         if (err < 0)
2904                 goto err_expr_new;
2905
2906         return expr;
2907 err_expr_new:
2908         kfree(expr);
2909 err_expr_stateful:
2910         owner = expr_info.ops->type->owner;
2911         if (expr_info.ops->type->release_ops)
2912                 expr_info.ops->type->release_ops(expr_info.ops);
2913
2914         module_put(owner);
2915 err_expr_parse:
2916         return ERR_PTR(err);
2917 }
2918
2919 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2920 {
2921         int err;
2922
2923         if (src->ops->clone) {
2924                 dst->ops = src->ops;
2925                 err = src->ops->clone(dst, src);
2926                 if (err < 0)
2927                         return err;
2928         } else {
2929                 memcpy(dst, src, src->ops->size);
2930         }
2931
2932         __module_get(src->ops->type->owner);
2933
2934         return 0;
2935 }
2936
2937 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2938 {
2939         nf_tables_expr_destroy(ctx, expr);
2940         kfree(expr);
2941 }
2942
2943 /*
2944  * Rules
2945  */
2946
2947 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2948                                           u64 handle)
2949 {
2950         struct nft_rule *rule;
2951
2952         // FIXME: this sucks
2953         list_for_each_entry_rcu(rule, &chain->rules, list) {
2954                 if (handle == rule->handle)
2955                         return rule;
2956         }
2957
2958         return ERR_PTR(-ENOENT);
2959 }
2960
2961 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2962                                         const struct nlattr *nla)
2963 {
2964         if (nla == NULL)
2965                 return ERR_PTR(-EINVAL);
2966
2967         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2968 }
2969
2970 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2971         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
2972                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
2973         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
2974                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
2975         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
2976         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2977         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
2978         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
2979         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
2980                                     .len = NFT_USERDATA_MAXLEN },
2981         [NFTA_RULE_ID]          = { .type = NLA_U32 },
2982         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2983         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
2984 };
2985
2986 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2987                                     u32 portid, u32 seq, int event,
2988                                     u32 flags, int family,
2989                                     const struct nft_table *table,
2990                                     const struct nft_chain *chain,
2991                                     const struct nft_rule *rule, u64 handle)
2992 {
2993         struct nlmsghdr *nlh;
2994         const struct nft_expr *expr, *next;
2995         struct nlattr *list;
2996         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2997
2998         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
2999                            nft_base_seq(net));
3000         if (!nlh)
3001                 goto nla_put_failure;
3002
3003         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3004                 goto nla_put_failure;
3005         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3006                 goto nla_put_failure;
3007         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3008                          NFTA_RULE_PAD))
3009                 goto nla_put_failure;
3010
3011         if (event != NFT_MSG_DELRULE && handle) {
3012                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3013                                  NFTA_RULE_PAD))
3014                         goto nla_put_failure;
3015         }
3016
3017         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3018                 nft_flow_rule_stats(chain, rule);
3019
3020         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3021         if (list == NULL)
3022                 goto nla_put_failure;
3023         nft_rule_for_each_expr(expr, next, rule) {
3024                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
3025                         goto nla_put_failure;
3026         }
3027         nla_nest_end(skb, list);
3028
3029         if (rule->udata) {
3030                 struct nft_userdata *udata = nft_userdata(rule);
3031                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3032                             udata->data) < 0)
3033                         goto nla_put_failure;
3034         }
3035
3036         nlmsg_end(skb, nlh);
3037         return 0;
3038
3039 nla_put_failure:
3040         nlmsg_trim(skb, nlh);
3041         return -1;
3042 }
3043
3044 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3045                                   const struct nft_rule *rule, int event)
3046 {
3047         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3048         const struct nft_rule *prule;
3049         struct sk_buff *skb;
3050         u64 handle = 0;
3051         u16 flags = 0;
3052         int err;
3053
3054         if (!ctx->report &&
3055             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3056                 return;
3057
3058         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3059         if (skb == NULL)
3060                 goto err;
3061
3062         if (event == NFT_MSG_NEWRULE &&
3063             !list_is_first(&rule->list, &ctx->chain->rules) &&
3064             !list_is_last(&rule->list, &ctx->chain->rules)) {
3065                 prule = list_prev_entry(rule, list);
3066                 handle = prule->handle;
3067         }
3068         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3069                 flags |= NLM_F_APPEND;
3070         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3071                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3072
3073         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3074                                        event, flags, ctx->family, ctx->table,
3075                                        ctx->chain, rule, handle);
3076         if (err < 0) {
3077                 kfree_skb(skb);
3078                 goto err;
3079         }
3080
3081         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3082         return;
3083 err:
3084         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3085 }
3086
3087 struct nft_rule_dump_ctx {
3088         char *table;
3089         char *chain;
3090 };
3091
3092 static int __nf_tables_dump_rules(struct sk_buff *skb,
3093                                   unsigned int *idx,
3094                                   struct netlink_callback *cb,
3095                                   const struct nft_table *table,
3096                                   const struct nft_chain *chain)
3097 {
3098         struct net *net = sock_net(skb->sk);
3099         const struct nft_rule *rule, *prule;
3100         unsigned int s_idx = cb->args[0];
3101         u64 handle;
3102
3103         prule = NULL;
3104         list_for_each_entry_rcu(rule, &chain->rules, list) {
3105                 if (!nft_is_active(net, rule))
3106                         goto cont_skip;
3107                 if (*idx < s_idx)
3108                         goto cont;
3109                 if (*idx > s_idx) {
3110                         memset(&cb->args[1], 0,
3111                                         sizeof(cb->args) - sizeof(cb->args[0]));
3112                 }
3113                 if (prule)
3114                         handle = prule->handle;
3115                 else
3116                         handle = 0;
3117
3118                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3119                                         cb->nlh->nlmsg_seq,
3120                                         NFT_MSG_NEWRULE,
3121                                         NLM_F_MULTI | NLM_F_APPEND,
3122                                         table->family,
3123                                         table, chain, rule, handle) < 0)
3124                         return 1;
3125
3126                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3127 cont:
3128                 prule = rule;
3129 cont_skip:
3130                 (*idx)++;
3131         }
3132         return 0;
3133 }
3134
3135 static int nf_tables_dump_rules(struct sk_buff *skb,
3136                                 struct netlink_callback *cb)
3137 {
3138         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3139         const struct nft_rule_dump_ctx *ctx = cb->data;
3140         struct nft_table *table;
3141         const struct nft_chain *chain;
3142         unsigned int idx = 0;
3143         struct net *net = sock_net(skb->sk);
3144         int family = nfmsg->nfgen_family;
3145         struct nftables_pernet *nft_net;
3146
3147         rcu_read_lock();
3148         nft_net = nft_pernet(net);
3149         cb->seq = nft_net->base_seq;
3150
3151         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3152                 if (family != NFPROTO_UNSPEC && family != table->family)
3153                         continue;
3154
3155                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3156                         continue;
3157
3158                 if (ctx && ctx->table && ctx->chain) {
3159                         struct rhlist_head *list, *tmp;
3160
3161                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3162                                                nft_chain_ht_params);
3163                         if (!list)
3164                                 goto done;
3165
3166                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3167                                 if (!nft_is_active(net, chain))
3168                                         continue;
3169                                 __nf_tables_dump_rules(skb, &idx,
3170                                                        cb, table, chain);
3171                                 break;
3172                         }
3173                         goto done;
3174                 }
3175
3176                 list_for_each_entry_rcu(chain, &table->chains, list) {
3177                         if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
3178                                 goto done;
3179                 }
3180
3181                 if (ctx && ctx->table)
3182                         break;
3183         }
3184 done:
3185         rcu_read_unlock();
3186
3187         cb->args[0] = idx;
3188         return skb->len;
3189 }
3190
3191 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3192 {
3193         const struct nlattr * const *nla = cb->data;
3194         struct nft_rule_dump_ctx *ctx = NULL;
3195
3196         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3197                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3198                 if (!ctx)
3199                         return -ENOMEM;
3200
3201                 if (nla[NFTA_RULE_TABLE]) {
3202                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3203                                                         GFP_ATOMIC);
3204                         if (!ctx->table) {
3205                                 kfree(ctx);
3206                                 return -ENOMEM;
3207                         }
3208                 }
3209                 if (nla[NFTA_RULE_CHAIN]) {
3210                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3211                                                 GFP_ATOMIC);
3212                         if (!ctx->chain) {
3213                                 kfree(ctx->table);
3214                                 kfree(ctx);
3215                                 return -ENOMEM;
3216                         }
3217                 }
3218         }
3219
3220         cb->data = ctx;
3221         return 0;
3222 }
3223
3224 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3225 {
3226         struct nft_rule_dump_ctx *ctx = cb->data;
3227
3228         if (ctx) {
3229                 kfree(ctx->table);
3230                 kfree(ctx->chain);
3231                 kfree(ctx);
3232         }
3233         return 0;
3234 }
3235
3236 /* called with rcu_read_lock held */
3237 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3238                              const struct nlattr * const nla[])
3239 {
3240         struct netlink_ext_ack *extack = info->extack;
3241         u8 genmask = nft_genmask_cur(info->net);
3242         u8 family = info->nfmsg->nfgen_family;
3243         const struct nft_chain *chain;
3244         const struct nft_rule *rule;
3245         struct net *net = info->net;
3246         struct nft_table *table;
3247         struct sk_buff *skb2;
3248         int err;
3249
3250         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3251                 struct netlink_dump_control c = {
3252                         .start= nf_tables_dump_rules_start,
3253                         .dump = nf_tables_dump_rules,
3254                         .done = nf_tables_dump_rules_done,
3255                         .module = THIS_MODULE,
3256                         .data = (void *)nla,
3257                 };
3258
3259                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3260         }
3261
3262         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3263         if (IS_ERR(table)) {
3264                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3265                 return PTR_ERR(table);
3266         }
3267
3268         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3269         if (IS_ERR(chain)) {
3270                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3271                 return PTR_ERR(chain);
3272         }
3273
3274         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3275         if (IS_ERR(rule)) {
3276                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3277                 return PTR_ERR(rule);
3278         }
3279
3280         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3281         if (!skb2)
3282                 return -ENOMEM;
3283
3284         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3285                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3286                                        family, table, chain, rule, 0);
3287         if (err < 0)
3288                 goto err_fill_rule_info;
3289
3290         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3291
3292 err_fill_rule_info:
3293         kfree_skb(skb2);
3294         return err;
3295 }
3296
3297 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3298                                    struct nft_rule *rule)
3299 {
3300         struct nft_expr *expr, *next;
3301
3302         /*
3303          * Careful: some expressions might not be initialized in case this
3304          * is called on error from nf_tables_newrule().
3305          */
3306         expr = nft_expr_first(rule);
3307         while (nft_expr_more(rule, expr)) {
3308                 next = nft_expr_next(expr);
3309                 nf_tables_expr_destroy(ctx, expr);
3310                 expr = next;
3311         }
3312         kfree(rule);
3313 }
3314
3315 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3316 {
3317         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3318         nf_tables_rule_destroy(ctx, rule);
3319 }
3320
3321 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3322 {
3323         struct nft_expr *expr, *last;
3324         const struct nft_data *data;
3325         struct nft_rule *rule;
3326         int err;
3327
3328         if (ctx->level == NFT_JUMP_STACK_SIZE)
3329                 return -EMLINK;
3330
3331         list_for_each_entry(rule, &chain->rules, list) {
3332                 if (!nft_is_active_next(ctx->net, rule))
3333                         continue;
3334
3335                 nft_rule_for_each_expr(expr, last, rule) {
3336                         if (!expr->ops->validate)
3337                                 continue;
3338
3339                         err = expr->ops->validate(ctx, expr, &data);
3340                         if (err < 0)
3341                                 return err;
3342                 }
3343         }
3344
3345         return 0;
3346 }
3347 EXPORT_SYMBOL_GPL(nft_chain_validate);
3348
3349 static int nft_table_validate(struct net *net, const struct nft_table *table)
3350 {
3351         struct nft_chain *chain;
3352         struct nft_ctx ctx = {
3353                 .net    = net,
3354                 .family = table->family,
3355         };
3356         int err;
3357
3358         list_for_each_entry(chain, &table->chains, list) {
3359                 if (!nft_is_base_chain(chain))
3360                         continue;
3361
3362                 ctx.chain = chain;
3363                 err = nft_chain_validate(&ctx, chain);
3364                 if (err < 0)
3365                         return err;
3366         }
3367
3368         return 0;
3369 }
3370
3371 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3372                                              const struct nlattr *nla);
3373
3374 #define NFT_RULE_MAXEXPRS       128
3375
3376 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3377                              const struct nlattr * const nla[])
3378 {
3379         struct nftables_pernet *nft_net = nft_pernet(info->net);
3380         struct netlink_ext_ack *extack = info->extack;
3381         unsigned int size, i, n, ulen = 0, usize = 0;
3382         u8 genmask = nft_genmask_next(info->net);
3383         struct nft_rule *rule, *old_rule = NULL;
3384         struct nft_expr_info *expr_info = NULL;
3385         u8 family = info->nfmsg->nfgen_family;
3386         struct nft_flow_rule *flow = NULL;
3387         struct net *net = info->net;
3388         struct nft_userdata *udata;
3389         struct nft_table *table;
3390         struct nft_chain *chain;
3391         struct nft_trans *trans;
3392         u64 handle, pos_handle;
3393         struct nft_expr *expr;
3394         struct nft_ctx ctx;
3395         struct nlattr *tmp;
3396         int err, rem;
3397
3398         lockdep_assert_held(&nft_net->commit_mutex);
3399
3400         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3401                                  NETLINK_CB(skb).portid);
3402         if (IS_ERR(table)) {
3403                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3404                 return PTR_ERR(table);
3405         }
3406
3407         if (nla[NFTA_RULE_CHAIN]) {
3408                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3409                                          genmask);
3410                 if (IS_ERR(chain)) {
3411                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3412                         return PTR_ERR(chain);
3413                 }
3414                 if (nft_chain_is_bound(chain))
3415                         return -EOPNOTSUPP;
3416
3417         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3418                 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3419                 if (IS_ERR(chain)) {
3420                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3421                         return PTR_ERR(chain);
3422                 }
3423         } else {
3424                 return -EINVAL;
3425         }
3426
3427         if (nla[NFTA_RULE_HANDLE]) {
3428                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3429                 rule = __nft_rule_lookup(chain, handle);
3430                 if (IS_ERR(rule)) {
3431                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3432                         return PTR_ERR(rule);
3433                 }
3434
3435                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3436                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3437                         return -EEXIST;
3438                 }
3439                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3440                         old_rule = rule;
3441                 else
3442                         return -EOPNOTSUPP;
3443         } else {
3444                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3445                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3446                         return -EINVAL;
3447                 handle = nf_tables_alloc_handle(table);
3448
3449                 if (chain->use == UINT_MAX)
3450                         return -EOVERFLOW;
3451
3452                 if (nla[NFTA_RULE_POSITION]) {
3453                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3454                         old_rule = __nft_rule_lookup(chain, pos_handle);
3455                         if (IS_ERR(old_rule)) {
3456                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3457                                 return PTR_ERR(old_rule);
3458                         }
3459                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3460                         old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3461                         if (IS_ERR(old_rule)) {
3462                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3463                                 return PTR_ERR(old_rule);
3464                         }
3465                 }
3466         }
3467
3468         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3469
3470         n = 0;
3471         size = 0;
3472         if (nla[NFTA_RULE_EXPRESSIONS]) {
3473                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3474                                            sizeof(struct nft_expr_info),
3475                                            GFP_KERNEL);
3476                 if (!expr_info)
3477                         return -ENOMEM;
3478
3479                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3480                         err = -EINVAL;
3481                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3482                                 goto err_release_expr;
3483                         if (n == NFT_RULE_MAXEXPRS)
3484                                 goto err_release_expr;
3485                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3486                         if (err < 0) {
3487                                 NL_SET_BAD_ATTR(extack, tmp);
3488                                 goto err_release_expr;
3489                         }
3490                         size += expr_info[n].ops->size;
3491                         n++;
3492                 }
3493         }
3494         /* Check for overflow of dlen field */
3495         err = -EFBIG;
3496         if (size >= 1 << 12)
3497                 goto err_release_expr;
3498
3499         if (nla[NFTA_RULE_USERDATA]) {
3500                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3501                 if (ulen > 0)
3502                         usize = sizeof(struct nft_userdata) + ulen;
3503         }
3504
3505         err = -ENOMEM;
3506         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3507         if (rule == NULL)
3508                 goto err_release_expr;
3509
3510         nft_activate_next(net, rule);
3511
3512         rule->handle = handle;
3513         rule->dlen   = size;
3514         rule->udata  = ulen ? 1 : 0;
3515
3516         if (ulen) {
3517                 udata = nft_userdata(rule);
3518                 udata->len = ulen - 1;
3519                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3520         }
3521
3522         expr = nft_expr_first(rule);
3523         for (i = 0; i < n; i++) {
3524                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3525                 if (err < 0) {
3526                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3527                         goto err_release_rule;
3528                 }
3529
3530                 if (expr_info[i].ops->validate)
3531                         nft_validate_state_update(net, NFT_VALIDATE_NEED);
3532
3533                 expr_info[i].ops = NULL;
3534                 expr = nft_expr_next(expr);
3535         }
3536
3537         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3538                 flow = nft_flow_rule_create(net, rule);
3539                 if (IS_ERR(flow)) {
3540                         err = PTR_ERR(flow);
3541                         goto err_release_rule;
3542                 }
3543         }
3544
3545         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3546                 err = nft_delrule(&ctx, old_rule);
3547                 if (err < 0)
3548                         goto err_destroy_flow_rule;
3549
3550                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3551                 if (trans == NULL) {
3552                         err = -ENOMEM;
3553                         goto err_destroy_flow_rule;
3554                 }
3555                 list_add_tail_rcu(&rule->list, &old_rule->list);
3556         } else {
3557                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3558                 if (!trans) {
3559                         err = -ENOMEM;
3560                         goto err_destroy_flow_rule;
3561                 }
3562
3563                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3564                         if (old_rule)
3565                                 list_add_rcu(&rule->list, &old_rule->list);
3566                         else
3567                                 list_add_tail_rcu(&rule->list, &chain->rules);
3568                  } else {
3569                         if (old_rule)
3570                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3571                         else
3572                                 list_add_rcu(&rule->list, &chain->rules);
3573                 }
3574         }
3575         kvfree(expr_info);
3576         chain->use++;
3577
3578         if (flow)
3579                 nft_trans_flow_rule(trans) = flow;
3580
3581         if (nft_net->validate_state == NFT_VALIDATE_DO)
3582                 return nft_table_validate(net, table);
3583
3584         return 0;
3585
3586 err_destroy_flow_rule:
3587         if (flow)
3588                 nft_flow_rule_destroy(flow);
3589 err_release_rule:
3590         nf_tables_rule_release(&ctx, rule);
3591 err_release_expr:
3592         for (i = 0; i < n; i++) {
3593                 if (expr_info[i].ops) {
3594                         module_put(expr_info[i].ops->type->owner);
3595                         if (expr_info[i].ops->type->release_ops)
3596                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3597                 }
3598         }
3599         kvfree(expr_info);
3600
3601         return err;
3602 }
3603
3604 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3605                                              const struct nlattr *nla)
3606 {
3607         struct nftables_pernet *nft_net = nft_pernet(net);
3608         u32 id = ntohl(nla_get_be32(nla));
3609         struct nft_trans *trans;
3610
3611         list_for_each_entry(trans, &nft_net->commit_list, list) {
3612                 struct nft_rule *rule = nft_trans_rule(trans);
3613
3614                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3615                     id == nft_trans_rule_id(trans))
3616                         return rule;
3617         }
3618         return ERR_PTR(-ENOENT);
3619 }
3620
3621 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3622                              const struct nlattr * const nla[])
3623 {
3624         struct netlink_ext_ack *extack = info->extack;
3625         u8 genmask = nft_genmask_next(info->net);
3626         u8 family = info->nfmsg->nfgen_family;
3627         struct nft_chain *chain = NULL;
3628         struct net *net = info->net;
3629         struct nft_table *table;
3630         struct nft_rule *rule;
3631         struct nft_ctx ctx;
3632         int err = 0;
3633
3634         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3635                                  NETLINK_CB(skb).portid);
3636         if (IS_ERR(table)) {
3637                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3638                 return PTR_ERR(table);
3639         }
3640
3641         if (nla[NFTA_RULE_CHAIN]) {
3642                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3643                                          genmask);
3644                 if (IS_ERR(chain)) {
3645                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3646                         return PTR_ERR(chain);
3647                 }
3648                 if (nft_chain_is_bound(chain))
3649                         return -EOPNOTSUPP;
3650         }
3651
3652         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3653
3654         if (chain) {
3655                 if (nla[NFTA_RULE_HANDLE]) {
3656                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3657                         if (IS_ERR(rule)) {
3658                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3659                                 return PTR_ERR(rule);
3660                         }
3661
3662                         err = nft_delrule(&ctx, rule);
3663                 } else if (nla[NFTA_RULE_ID]) {
3664                         rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3665                         if (IS_ERR(rule)) {
3666                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3667                                 return PTR_ERR(rule);
3668                         }
3669
3670                         err = nft_delrule(&ctx, rule);
3671                 } else {
3672                         err = nft_delrule_by_chain(&ctx);
3673                 }
3674         } else {
3675                 list_for_each_entry(chain, &table->chains, list) {
3676                         if (!nft_is_active_next(net, chain))
3677                                 continue;
3678
3679                         ctx.chain = chain;
3680                         err = nft_delrule_by_chain(&ctx);
3681                         if (err < 0)
3682                                 break;
3683                 }
3684         }
3685
3686         return err;
3687 }
3688
3689 /*
3690  * Sets
3691  */
3692 static const struct nft_set_type *nft_set_types[] = {
3693         &nft_set_hash_fast_type,
3694         &nft_set_hash_type,
3695         &nft_set_rhash_type,
3696         &nft_set_bitmap_type,
3697         &nft_set_rbtree_type,
3698 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3699         &nft_set_pipapo_avx2_type,
3700 #endif
3701         &nft_set_pipapo_type,
3702 };
3703
3704 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3705                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3706                                  NFT_SET_EVAL)
3707
3708 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3709 {
3710         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3711 }
3712
3713 /*
3714  * Select a set implementation based on the data characteristics and the
3715  * given policy. The total memory use might not be known if no size is
3716  * given, in that case the amount of memory per element is used.
3717  */
3718 static const struct nft_set_ops *
3719 nft_select_set_ops(const struct nft_ctx *ctx,
3720                    const struct nlattr * const nla[],
3721                    const struct nft_set_desc *desc,
3722                    enum nft_set_policies policy)
3723 {
3724         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3725         const struct nft_set_ops *ops, *bops;
3726         struct nft_set_estimate est, best;
3727         const struct nft_set_type *type;
3728         u32 flags = 0;
3729         int i;
3730
3731         lockdep_assert_held(&nft_net->commit_mutex);
3732         lockdep_nfnl_nft_mutex_not_held();
3733
3734         if (nla[NFTA_SET_FLAGS] != NULL)
3735                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3736
3737         bops        = NULL;
3738         best.size   = ~0;
3739         best.lookup = ~0;
3740         best.space  = ~0;
3741
3742         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3743                 type = nft_set_types[i];
3744                 ops = &type->ops;
3745
3746                 if (!nft_set_ops_candidate(type, flags))
3747                         continue;
3748                 if (!ops->estimate(desc, flags, &est))
3749                         continue;
3750
3751                 switch (policy) {
3752                 case NFT_SET_POL_PERFORMANCE:
3753                         if (est.lookup < best.lookup)
3754                                 break;
3755                         if (est.lookup == best.lookup &&
3756                             est.space < best.space)
3757                                 break;
3758                         continue;
3759                 case NFT_SET_POL_MEMORY:
3760                         if (!desc->size) {
3761                                 if (est.space < best.space)
3762                                         break;
3763                                 if (est.space == best.space &&
3764                                     est.lookup < best.lookup)
3765                                         break;
3766                         } else if (est.size < best.size || !bops) {
3767                                 break;
3768                         }
3769                         continue;
3770                 default:
3771                         break;
3772                 }
3773
3774                 bops = ops;
3775                 best = est;
3776         }
3777
3778         if (bops != NULL)
3779                 return bops;
3780
3781         return ERR_PTR(-EOPNOTSUPP);
3782 }
3783
3784 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3785         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3786                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3787         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3788                                             .len = NFT_SET_MAXNAMELEN - 1 },
3789         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3790         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3791         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3792         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3793         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3794         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3795         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3796         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3797         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3798         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3799         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3800                                             .len  = NFT_USERDATA_MAXLEN },
3801         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3802         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3803         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3804         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
3805 };
3806
3807 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3808         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3809         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3810 };
3811
3812 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3813                                       const struct nlattr *nla, u8 genmask)
3814 {
3815         struct nft_set *set;
3816
3817         if (nla == NULL)
3818                 return ERR_PTR(-EINVAL);
3819
3820         list_for_each_entry_rcu(set, &table->sets, list) {
3821                 if (!nla_strcmp(nla, set->name) &&
3822                     nft_active_genmask(set, genmask))
3823                         return set;
3824         }
3825         return ERR_PTR(-ENOENT);
3826 }
3827
3828 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3829                                                const struct nlattr *nla,
3830                                                u8 genmask)
3831 {
3832         struct nft_set *set;
3833
3834         list_for_each_entry(set, &table->sets, list) {
3835                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3836                     nft_active_genmask(set, genmask))
3837                         return set;
3838         }
3839         return ERR_PTR(-ENOENT);
3840 }
3841
3842 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3843                                            const struct nlattr *nla, u8 genmask)
3844 {
3845         struct nftables_pernet *nft_net = nft_pernet(net);
3846         u32 id = ntohl(nla_get_be32(nla));
3847         struct nft_trans *trans;
3848
3849         list_for_each_entry(trans, &nft_net->commit_list, list) {
3850                 if (trans->msg_type == NFT_MSG_NEWSET) {
3851                         struct nft_set *set = nft_trans_set(trans);
3852
3853                         if (id == nft_trans_set_id(trans) &&
3854                             nft_active_genmask(set, genmask))
3855                                 return set;
3856                 }
3857         }
3858         return ERR_PTR(-ENOENT);
3859 }
3860
3861 struct nft_set *nft_set_lookup_global(const struct net *net,
3862                                       const struct nft_table *table,
3863                                       const struct nlattr *nla_set_name,
3864                                       const struct nlattr *nla_set_id,
3865                                       u8 genmask)
3866 {
3867         struct nft_set *set;
3868
3869         set = nft_set_lookup(table, nla_set_name, genmask);
3870         if (IS_ERR(set)) {
3871                 if (!nla_set_id)
3872                         return set;
3873
3874                 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3875         }
3876         return set;
3877 }
3878 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3879
3880 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3881                                     const char *name)
3882 {
3883         const struct nft_set *i;
3884         const char *p;
3885         unsigned long *inuse;
3886         unsigned int n = 0, min = 0;
3887
3888         p = strchr(name, '%');
3889         if (p != NULL) {
3890                 if (p[1] != 'd' || strchr(p + 2, '%'))
3891                         return -EINVAL;
3892
3893                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3894                 if (inuse == NULL)
3895                         return -ENOMEM;
3896 cont:
3897                 list_for_each_entry(i, &ctx->table->sets, list) {
3898                         int tmp;
3899
3900                         if (!nft_is_active_next(ctx->net, set))
3901                                 continue;
3902                         if (!sscanf(i->name, name, &tmp))
3903                                 continue;
3904                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3905                                 continue;
3906
3907                         set_bit(tmp - min, inuse);
3908                 }
3909
3910                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3911                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3912                         min += BITS_PER_BYTE * PAGE_SIZE;
3913                         memset(inuse, 0, PAGE_SIZE);
3914                         goto cont;
3915                 }
3916                 free_page((unsigned long)inuse);
3917         }
3918
3919         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
3920         if (!set->name)
3921                 return -ENOMEM;
3922
3923         list_for_each_entry(i, &ctx->table->sets, list) {
3924                 if (!nft_is_active_next(ctx->net, i))
3925                         continue;
3926                 if (!strcmp(set->name, i->name)) {
3927                         kfree(set->name);
3928                         set->name = NULL;
3929                         return -ENFILE;
3930                 }
3931         }
3932         return 0;
3933 }
3934
3935 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3936 {
3937         u64 ms = be64_to_cpu(nla_get_be64(nla));
3938         u64 max = (u64)(~((u64)0));
3939
3940         max = div_u64(max, NSEC_PER_MSEC);
3941         if (ms >= max)
3942                 return -ERANGE;
3943
3944         ms *= NSEC_PER_MSEC;
3945         *result = nsecs_to_jiffies64(ms);
3946         return 0;
3947 }
3948
3949 __be64 nf_jiffies64_to_msecs(u64 input)
3950 {
3951         return cpu_to_be64(jiffies64_to_msecs(input));
3952 }
3953
3954 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3955                                      const struct nft_set *set)
3956 {
3957         struct nlattr *concat, *field;
3958         int i;
3959
3960         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3961         if (!concat)
3962                 return -ENOMEM;
3963
3964         for (i = 0; i < set->field_count; i++) {
3965                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3966                 if (!field)
3967                         return -ENOMEM;
3968
3969                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3970                                  htonl(set->field_len[i])))
3971                         return -ENOMEM;
3972
3973                 nla_nest_end(skb, field);
3974         }
3975
3976         nla_nest_end(skb, concat);
3977
3978         return 0;
3979 }
3980
3981 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3982                               const struct nft_set *set, u16 event, u16 flags)
3983 {
3984         struct nlmsghdr *nlh;
3985         u32 portid = ctx->portid;
3986         struct nlattr *nest;
3987         u32 seq = ctx->seq;
3988         int i;
3989
3990         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3991         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
3992                            NFNETLINK_V0, nft_base_seq(ctx->net));
3993         if (!nlh)
3994                 goto nla_put_failure;
3995
3996         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3997                 goto nla_put_failure;
3998         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3999                 goto nla_put_failure;
4000         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4001                          NFTA_SET_PAD))
4002                 goto nla_put_failure;
4003         if (set->flags != 0)
4004                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4005                         goto nla_put_failure;
4006
4007         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4008                 goto nla_put_failure;
4009         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4010                 goto nla_put_failure;
4011         if (set->flags & NFT_SET_MAP) {
4012                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4013                         goto nla_put_failure;
4014                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4015                         goto nla_put_failure;
4016         }
4017         if (set->flags & NFT_SET_OBJECT &&
4018             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4019                 goto nla_put_failure;
4020
4021         if (set->timeout &&
4022             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4023                          nf_jiffies64_to_msecs(set->timeout),
4024                          NFTA_SET_PAD))
4025                 goto nla_put_failure;
4026         if (set->gc_int &&
4027             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
4028                 goto nla_put_failure;
4029
4030         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4031                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4032                         goto nla_put_failure;
4033         }
4034
4035         if (set->udata &&
4036             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4037                 goto nla_put_failure;
4038
4039         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4040         if (!nest)
4041                 goto nla_put_failure;
4042         if (set->size &&
4043             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4044                 goto nla_put_failure;
4045
4046         if (set->field_count > 1 &&
4047             nf_tables_fill_set_concat(skb, set))
4048                 goto nla_put_failure;
4049
4050         nla_nest_end(skb, nest);
4051
4052         if (set->num_exprs == 1) {
4053                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4054                 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
4055                         goto nla_put_failure;
4056
4057                 nla_nest_end(skb, nest);
4058         } else if (set->num_exprs > 1) {
4059                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4060                 if (nest == NULL)
4061                         goto nla_put_failure;
4062
4063                 for (i = 0; i < set->num_exprs; i++) {
4064                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4065                                           set->exprs[i]) < 0)
4066                                 goto nla_put_failure;
4067                 }
4068                 nla_nest_end(skb, nest);
4069         }
4070
4071         nlmsg_end(skb, nlh);
4072         return 0;
4073
4074 nla_put_failure:
4075         nlmsg_trim(skb, nlh);
4076         return -1;
4077 }
4078
4079 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4080                                  const struct nft_set *set, int event,
4081                                  gfp_t gfp_flags)
4082 {
4083         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4084         u32 portid = ctx->portid;
4085         struct sk_buff *skb;
4086         u16 flags = 0;
4087         int err;
4088
4089         if (!ctx->report &&
4090             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4091                 return;
4092
4093         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4094         if (skb == NULL)
4095                 goto err;
4096
4097         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4098                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4099
4100         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4101         if (err < 0) {
4102                 kfree_skb(skb);
4103                 goto err;
4104         }
4105
4106         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4107         return;
4108 err:
4109         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4110 }
4111
4112 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4113 {
4114         const struct nft_set *set;
4115         unsigned int idx, s_idx = cb->args[0];
4116         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4117         struct net *net = sock_net(skb->sk);
4118         struct nft_ctx *ctx = cb->data, ctx_set;
4119         struct nftables_pernet *nft_net;
4120
4121         if (cb->args[1])
4122                 return skb->len;
4123
4124         rcu_read_lock();
4125         nft_net = nft_pernet(net);
4126         cb->seq = nft_net->base_seq;
4127
4128         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4129                 if (ctx->family != NFPROTO_UNSPEC &&
4130                     ctx->family != table->family)
4131                         continue;
4132
4133                 if (ctx->table && ctx->table != table)
4134                         continue;
4135
4136                 if (cur_table) {
4137                         if (cur_table != table)
4138                                 continue;
4139
4140                         cur_table = NULL;
4141                 }
4142                 idx = 0;
4143                 list_for_each_entry_rcu(set, &table->sets, list) {
4144                         if (idx < s_idx)
4145                                 goto cont;
4146                         if (!nft_is_active(net, set))
4147                                 goto cont;
4148
4149                         ctx_set = *ctx;
4150                         ctx_set.table = table;
4151                         ctx_set.family = table->family;
4152
4153                         if (nf_tables_fill_set(skb, &ctx_set, set,
4154                                                NFT_MSG_NEWSET,
4155                                                NLM_F_MULTI) < 0) {
4156                                 cb->args[0] = idx;
4157                                 cb->args[2] = (unsigned long) table;
4158                                 goto done;
4159                         }
4160                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4161 cont:
4162                         idx++;
4163                 }
4164                 if (s_idx)
4165                         s_idx = 0;
4166         }
4167         cb->args[1] = 1;
4168 done:
4169         rcu_read_unlock();
4170         return skb->len;
4171 }
4172
4173 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4174 {
4175         struct nft_ctx *ctx_dump = NULL;
4176
4177         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4178         if (ctx_dump == NULL)
4179                 return -ENOMEM;
4180
4181         cb->data = ctx_dump;
4182         return 0;
4183 }
4184
4185 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4186 {
4187         kfree(cb->data);
4188         return 0;
4189 }
4190
4191 /* called with rcu_read_lock held */
4192 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4193                             const struct nlattr * const nla[])
4194 {
4195         struct netlink_ext_ack *extack = info->extack;
4196         u8 genmask = nft_genmask_cur(info->net);
4197         u8 family = info->nfmsg->nfgen_family;
4198         struct nft_table *table = NULL;
4199         struct net *net = info->net;
4200         const struct nft_set *set;
4201         struct sk_buff *skb2;
4202         struct nft_ctx ctx;
4203         int err;
4204
4205         if (nla[NFTA_SET_TABLE]) {
4206                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4207                                          genmask, 0);
4208                 if (IS_ERR(table)) {
4209                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4210                         return PTR_ERR(table);
4211                 }
4212         }
4213
4214         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4215
4216         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4217                 struct netlink_dump_control c = {
4218                         .start = nf_tables_dump_sets_start,
4219                         .dump = nf_tables_dump_sets,
4220                         .done = nf_tables_dump_sets_done,
4221                         .data = &ctx,
4222                         .module = THIS_MODULE,
4223                 };
4224
4225                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4226         }
4227
4228         /* Only accept unspec with dump */
4229         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4230                 return -EAFNOSUPPORT;
4231         if (!nla[NFTA_SET_TABLE])
4232                 return -EINVAL;
4233
4234         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4235         if (IS_ERR(set))
4236                 return PTR_ERR(set);
4237
4238         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4239         if (skb2 == NULL)
4240                 return -ENOMEM;
4241
4242         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4243         if (err < 0)
4244                 goto err_fill_set_info;
4245
4246         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4247
4248 err_fill_set_info:
4249         kfree_skb(skb2);
4250         return err;
4251 }
4252
4253 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4254         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4255 };
4256
4257 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4258                                      struct nft_set_desc *desc)
4259 {
4260         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4261         u32 len;
4262         int err;
4263
4264         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4265                 return -E2BIG;
4266
4267         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4268                                           nft_concat_policy, NULL);
4269         if (err < 0)
4270                 return err;
4271
4272         if (!tb[NFTA_SET_FIELD_LEN])
4273                 return -EINVAL;
4274
4275         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4276         if (!len || len > U8_MAX)
4277                 return -EINVAL;
4278
4279         desc->field_len[desc->field_count++] = len;
4280
4281         return 0;
4282 }
4283
4284 static int nft_set_desc_concat(struct nft_set_desc *desc,
4285                                const struct nlattr *nla)
4286 {
4287         struct nlattr *attr;
4288         u32 num_regs = 0;
4289         int rem, err, i;
4290
4291         nla_for_each_nested(attr, nla, rem) {
4292                 if (nla_type(attr) != NFTA_LIST_ELEM)
4293                         return -EINVAL;
4294
4295                 err = nft_set_desc_concat_parse(attr, desc);
4296                 if (err < 0)
4297                         return err;
4298         }
4299
4300         for (i = 0; i < desc->field_count; i++)
4301                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4302
4303         if (num_regs > NFT_REG32_COUNT)
4304                 return -E2BIG;
4305
4306         return 0;
4307 }
4308
4309 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4310                                     const struct nlattr *nla)
4311 {
4312         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4313         int err;
4314
4315         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4316                                           nft_set_desc_policy, NULL);
4317         if (err < 0)
4318                 return err;
4319
4320         if (da[NFTA_SET_DESC_SIZE] != NULL)
4321                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4322         if (da[NFTA_SET_DESC_CONCAT])
4323                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4324
4325         return err;
4326 }
4327
4328 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4329                             const struct nlattr * const nla[])
4330 {
4331         u32 ktype, dtype, flags, policy, gc_int, objtype;
4332         struct netlink_ext_ack *extack = info->extack;
4333         u8 genmask = nft_genmask_next(info->net);
4334         u8 family = info->nfmsg->nfgen_family;
4335         const struct nft_set_ops *ops;
4336         struct nft_expr *expr = NULL;
4337         struct net *net = info->net;
4338         struct nft_set_desc desc;
4339         struct nft_table *table;
4340         unsigned char *udata;
4341         struct nft_set *set;
4342         struct nft_ctx ctx;
4343         size_t alloc_size;
4344         u64 timeout;
4345         char *name;
4346         int err, i;
4347         u16 udlen;
4348         u64 size;
4349
4350         if (nla[NFTA_SET_TABLE] == NULL ||
4351             nla[NFTA_SET_NAME] == NULL ||
4352             nla[NFTA_SET_KEY_LEN] == NULL ||
4353             nla[NFTA_SET_ID] == NULL)
4354                 return -EINVAL;
4355
4356         memset(&desc, 0, sizeof(desc));
4357
4358         ktype = NFT_DATA_VALUE;
4359         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4360                 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4361                 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4362                         return -EINVAL;
4363         }
4364
4365         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4366         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4367                 return -EINVAL;
4368
4369         flags = 0;
4370         if (nla[NFTA_SET_FLAGS] != NULL) {
4371                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4372                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4373                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4374                               NFT_SET_MAP | NFT_SET_EVAL |
4375                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4376                         return -EOPNOTSUPP;
4377                 /* Only one of these operations is supported */
4378                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4379                              (NFT_SET_MAP | NFT_SET_OBJECT))
4380                         return -EOPNOTSUPP;
4381                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4382                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4383                         return -EOPNOTSUPP;
4384         }
4385
4386         dtype = 0;
4387         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4388                 if (!(flags & NFT_SET_MAP))
4389                         return -EINVAL;
4390
4391                 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4392                 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4393                     dtype != NFT_DATA_VERDICT)
4394                         return -EINVAL;
4395
4396                 if (dtype != NFT_DATA_VERDICT) {
4397                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4398                                 return -EINVAL;
4399                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4400                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4401                                 return -EINVAL;
4402                 } else
4403                         desc.dlen = sizeof(struct nft_verdict);
4404         } else if (flags & NFT_SET_MAP)
4405                 return -EINVAL;
4406
4407         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4408                 if (!(flags & NFT_SET_OBJECT))
4409                         return -EINVAL;
4410
4411                 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4412                 if (objtype == NFT_OBJECT_UNSPEC ||
4413                     objtype > NFT_OBJECT_MAX)
4414                         return -EOPNOTSUPP;
4415         } else if (flags & NFT_SET_OBJECT)
4416                 return -EINVAL;
4417         else
4418                 objtype = NFT_OBJECT_UNSPEC;
4419
4420         timeout = 0;
4421         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4422                 if (!(flags & NFT_SET_TIMEOUT))
4423                         return -EINVAL;
4424
4425                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4426                 if (err)
4427                         return err;
4428         }
4429         gc_int = 0;
4430         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4431                 if (!(flags & NFT_SET_TIMEOUT))
4432                         return -EINVAL;
4433                 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4434         }
4435
4436         policy = NFT_SET_POL_PERFORMANCE;
4437         if (nla[NFTA_SET_POLICY] != NULL)
4438                 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4439
4440         if (nla[NFTA_SET_DESC] != NULL) {
4441                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4442                 if (err < 0)
4443                         return err;
4444         }
4445
4446         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4447                 desc.expr = true;
4448
4449         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4450                                  NETLINK_CB(skb).portid);
4451         if (IS_ERR(table)) {
4452                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4453                 return PTR_ERR(table);
4454         }
4455
4456         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4457
4458         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4459         if (IS_ERR(set)) {
4460                 if (PTR_ERR(set) != -ENOENT) {
4461                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4462                         return PTR_ERR(set);
4463                 }
4464         } else {
4465                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4466                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4467                         return -EEXIST;
4468                 }
4469                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4470                         return -EOPNOTSUPP;
4471
4472                 return 0;
4473         }
4474
4475         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4476                 return -ENOENT;
4477
4478         ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4479         if (IS_ERR(ops))
4480                 return PTR_ERR(ops);
4481
4482         udlen = 0;
4483         if (nla[NFTA_SET_USERDATA])
4484                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4485
4486         size = 0;
4487         if (ops->privsize != NULL)
4488                 size = ops->privsize(nla, &desc);
4489         alloc_size = sizeof(*set) + size + udlen;
4490         if (alloc_size < size || alloc_size > INT_MAX)
4491                 return -ENOMEM;
4492         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
4493         if (!set)
4494                 return -ENOMEM;
4495
4496         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
4497         if (!name) {
4498                 err = -ENOMEM;
4499                 goto err_set_name;
4500         }
4501
4502         err = nf_tables_set_alloc_name(&ctx, set, name);
4503         kfree(name);
4504         if (err < 0)
4505                 goto err_set_name;
4506
4507         udata = NULL;
4508         if (udlen) {
4509                 udata = set->data + size;
4510                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4511         }
4512
4513         INIT_LIST_HEAD(&set->bindings);
4514         INIT_LIST_HEAD(&set->catchall_list);
4515         set->table = table;
4516         write_pnet(&set->net, net);
4517         set->ops = ops;
4518         set->ktype = ktype;
4519         set->klen = desc.klen;
4520         set->dtype = dtype;
4521         set->objtype = objtype;
4522         set->dlen = desc.dlen;
4523         set->flags = flags;
4524         set->size = desc.size;
4525         set->policy = policy;
4526         set->udlen = udlen;
4527         set->udata = udata;
4528         set->timeout = timeout;
4529         set->gc_int = gc_int;
4530
4531         set->field_count = desc.field_count;
4532         for (i = 0; i < desc.field_count; i++)
4533                 set->field_len[i] = desc.field_len[i];
4534
4535         err = ops->init(set, &desc, nla);
4536         if (err < 0)
4537                 goto err_set_init;
4538
4539         if (nla[NFTA_SET_EXPR]) {
4540                 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4541                 if (IS_ERR(expr)) {
4542                         err = PTR_ERR(expr);
4543                         goto err_set_expr_alloc;
4544                 }
4545                 set->exprs[0] = expr;
4546                 set->num_exprs++;
4547         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4548                 struct nft_expr *expr;
4549                 struct nlattr *tmp;
4550                 int left;
4551
4552                 if (!(flags & NFT_SET_EXPR)) {
4553                         err = -EINVAL;
4554                         goto err_set_expr_alloc;
4555                 }
4556                 i = 0;
4557                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4558                         if (i == NFT_SET_EXPR_MAX) {
4559                                 err = -E2BIG;
4560                                 goto err_set_expr_alloc;
4561                         }
4562                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4563                                 err = -EINVAL;
4564                                 goto err_set_expr_alloc;
4565                         }
4566                         expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
4567                         if (IS_ERR(expr)) {
4568                                 err = PTR_ERR(expr);
4569                                 goto err_set_expr_alloc;
4570                         }
4571                         set->exprs[i++] = expr;
4572                         set->num_exprs++;
4573                 }
4574         }
4575
4576         set->handle = nf_tables_alloc_handle(table);
4577
4578         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4579         if (err < 0)
4580                 goto err_set_expr_alloc;
4581
4582         list_add_tail_rcu(&set->list, &table->sets);
4583         table->use++;
4584         return 0;
4585
4586 err_set_expr_alloc:
4587         for (i = 0; i < set->num_exprs; i++)
4588                 nft_expr_destroy(&ctx, set->exprs[i]);
4589
4590         ops->destroy(set);
4591 err_set_init:
4592         kfree(set->name);
4593 err_set_name:
4594         kvfree(set);
4595         return err;
4596 }
4597
4598 struct nft_set_elem_catchall {
4599         struct list_head        list;
4600         struct rcu_head         rcu;
4601         void                    *elem;
4602 };
4603
4604 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4605                                      struct nft_set *set)
4606 {
4607         struct nft_set_elem_catchall *next, *catchall;
4608
4609         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4610                 list_del_rcu(&catchall->list);
4611                 nft_set_elem_destroy(set, catchall->elem, true);
4612                 kfree_rcu(catchall, rcu);
4613         }
4614 }
4615
4616 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4617 {
4618         int i;
4619
4620         if (WARN_ON(set->use > 0))
4621                 return;
4622
4623         for (i = 0; i < set->num_exprs; i++)
4624                 nft_expr_destroy(ctx, set->exprs[i]);
4625
4626         set->ops->destroy(set);
4627         nft_set_catchall_destroy(ctx, set);
4628         kfree(set->name);
4629         kvfree(set);
4630 }
4631
4632 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4633                             const struct nlattr * const nla[])
4634 {
4635         struct netlink_ext_ack *extack = info->extack;
4636         u8 genmask = nft_genmask_next(info->net);
4637         u8 family = info->nfmsg->nfgen_family;
4638         struct net *net = info->net;
4639         const struct nlattr *attr;
4640         struct nft_table *table;
4641         struct nft_set *set;
4642         struct nft_ctx ctx;
4643
4644         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4645                 return -EAFNOSUPPORT;
4646
4647         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4648                                  genmask, NETLINK_CB(skb).portid);
4649         if (IS_ERR(table)) {
4650                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4651                 return PTR_ERR(table);
4652         }
4653
4654         if (nla[NFTA_SET_HANDLE]) {
4655                 attr = nla[NFTA_SET_HANDLE];
4656                 set = nft_set_lookup_byhandle(table, attr, genmask);
4657         } else {
4658                 attr = nla[NFTA_SET_NAME];
4659                 set = nft_set_lookup(table, attr, genmask);
4660         }
4661
4662         if (IS_ERR(set)) {
4663                 NL_SET_BAD_ATTR(extack, attr);
4664                 return PTR_ERR(set);
4665         }
4666         if (set->use ||
4667             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4668              atomic_read(&set->nelems) > 0)) {
4669                 NL_SET_BAD_ATTR(extack, attr);
4670                 return -EBUSY;
4671         }
4672
4673         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4674
4675         return nft_delset(&ctx, set);
4676 }
4677
4678 static int nft_validate_register_store(const struct nft_ctx *ctx,
4679                                        enum nft_registers reg,
4680                                        const struct nft_data *data,
4681                                        enum nft_data_types type,
4682                                        unsigned int len);
4683
4684 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4685                                      struct nft_set *set,
4686                                      struct nft_set_elem *elem)
4687 {
4688         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4689         enum nft_registers dreg;
4690
4691         dreg = nft_type_to_reg(set->dtype);
4692         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4693                                            set->dtype == NFT_DATA_VERDICT ?
4694                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4695                                            set->dlen);
4696 }
4697
4698 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4699                                         struct nft_set *set,
4700                                         const struct nft_set_iter *iter,
4701                                         struct nft_set_elem *elem)
4702 {
4703         return nft_setelem_data_validate(ctx, set, elem);
4704 }
4705
4706 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4707                                        struct nft_set *set)
4708 {
4709         u8 genmask = nft_genmask_next(ctx->net);
4710         struct nft_set_elem_catchall *catchall;
4711         struct nft_set_elem elem;
4712         struct nft_set_ext *ext;
4713         int ret = 0;
4714
4715         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4716                 ext = nft_set_elem_ext(set, catchall->elem);
4717                 if (!nft_set_elem_active(ext, genmask))
4718                         continue;
4719
4720                 elem.priv = catchall->elem;
4721                 ret = nft_setelem_data_validate(ctx, set, &elem);
4722                 if (ret < 0)
4723                         break;
4724         }
4725
4726         return ret;
4727 }
4728
4729 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4730                        struct nft_set_binding *binding)
4731 {
4732         struct nft_set_binding *i;
4733         struct nft_set_iter iter;
4734
4735         if (set->use == UINT_MAX)
4736                 return -EOVERFLOW;
4737
4738         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4739                 return -EBUSY;
4740
4741         if (binding->flags & NFT_SET_MAP) {
4742                 /* If the set is already bound to the same chain all
4743                  * jumps are already validated for that chain.
4744                  */
4745                 list_for_each_entry(i, &set->bindings, list) {
4746                         if (i->flags & NFT_SET_MAP &&
4747                             i->chain == binding->chain)
4748                                 goto bind;
4749                 }
4750
4751                 iter.genmask    = nft_genmask_next(ctx->net);
4752                 iter.skip       = 0;
4753                 iter.count      = 0;
4754                 iter.err        = 0;
4755                 iter.fn         = nf_tables_bind_check_setelem;
4756
4757                 set->ops->walk(ctx, set, &iter);
4758                 if (!iter.err)
4759                         iter.err = nft_set_catchall_bind_check(ctx, set);
4760
4761                 if (iter.err < 0)
4762                         return iter.err;
4763         }
4764 bind:
4765         binding->chain = ctx->chain;
4766         list_add_tail_rcu(&binding->list, &set->bindings);
4767         nft_set_trans_bind(ctx, set);
4768         set->use++;
4769
4770         return 0;
4771 }
4772 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4773
4774 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4775                                  struct nft_set_binding *binding, bool event)
4776 {
4777         list_del_rcu(&binding->list);
4778
4779         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4780                 list_del_rcu(&set->list);
4781                 if (event)
4782                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4783                                              GFP_KERNEL);
4784         }
4785 }
4786
4787 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4788                               struct nft_set_binding *binding,
4789                               enum nft_trans_phase phase)
4790 {
4791         switch (phase) {
4792         case NFT_TRANS_PREPARE:
4793                 set->use--;
4794                 return;
4795         case NFT_TRANS_ABORT:
4796         case NFT_TRANS_RELEASE:
4797                 set->use--;
4798                 fallthrough;
4799         default:
4800                 nf_tables_unbind_set(ctx, set, binding,
4801                                      phase == NFT_TRANS_COMMIT);
4802         }
4803 }
4804 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4805
4806 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4807 {
4808         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4809                 nft_set_destroy(ctx, set);
4810 }
4811 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4812
4813 const struct nft_set_ext_type nft_set_ext_types[] = {
4814         [NFT_SET_EXT_KEY]               = {
4815                 .align  = __alignof__(u32),
4816         },
4817         [NFT_SET_EXT_DATA]              = {
4818                 .align  = __alignof__(u32),
4819         },
4820         [NFT_SET_EXT_EXPRESSIONS]       = {
4821                 .align  = __alignof__(struct nft_set_elem_expr),
4822         },
4823         [NFT_SET_EXT_OBJREF]            = {
4824                 .len    = sizeof(struct nft_object *),
4825                 .align  = __alignof__(struct nft_object *),
4826         },
4827         [NFT_SET_EXT_FLAGS]             = {
4828                 .len    = sizeof(u8),
4829                 .align  = __alignof__(u8),
4830         },
4831         [NFT_SET_EXT_TIMEOUT]           = {
4832                 .len    = sizeof(u64),
4833                 .align  = __alignof__(u64),
4834         },
4835         [NFT_SET_EXT_EXPIRATION]        = {
4836                 .len    = sizeof(u64),
4837                 .align  = __alignof__(u64),
4838         },
4839         [NFT_SET_EXT_USERDATA]          = {
4840                 .len    = sizeof(struct nft_userdata),
4841                 .align  = __alignof__(struct nft_userdata),
4842         },
4843         [NFT_SET_EXT_KEY_END]           = {
4844                 .align  = __alignof__(u32),
4845         },
4846 };
4847
4848 /*
4849  * Set elements
4850  */
4851
4852 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4853         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
4854         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
4855         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
4856         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
4857         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
4858         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
4859                                             .len = NFT_USERDATA_MAXLEN },
4860         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
4861         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
4862                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
4863         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
4864         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
4865 };
4866
4867 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4868         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
4869                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4870         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
4871                                             .len = NFT_SET_MAXNAMELEN - 1 },
4872         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
4873         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
4874 };
4875
4876 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4877                                   const struct nft_set *set,
4878                                   const struct nft_set_ext *ext)
4879 {
4880         struct nft_set_elem_expr *elem_expr;
4881         u32 size, num_exprs = 0;
4882         struct nft_expr *expr;
4883         struct nlattr *nest;
4884
4885         elem_expr = nft_set_ext_expr(ext);
4886         nft_setelem_expr_foreach(expr, elem_expr, size)
4887                 num_exprs++;
4888
4889         if (num_exprs == 1) {
4890                 expr = nft_setelem_expr_at(elem_expr, 0);
4891                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4892                         return -1;
4893
4894                 return 0;
4895         } else if (num_exprs > 1) {
4896                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4897                 if (nest == NULL)
4898                         goto nla_put_failure;
4899
4900                 nft_setelem_expr_foreach(expr, elem_expr, size) {
4901                         expr = nft_setelem_expr_at(elem_expr, size);
4902                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4903                                 goto nla_put_failure;
4904                 }
4905                 nla_nest_end(skb, nest);
4906         }
4907         return 0;
4908
4909 nla_put_failure:
4910         return -1;
4911 }
4912
4913 static int nf_tables_fill_setelem(struct sk_buff *skb,
4914                                   const struct nft_set *set,
4915                                   const struct nft_set_elem *elem)
4916 {
4917         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4918         unsigned char *b = skb_tail_pointer(skb);
4919         struct nlattr *nest;
4920
4921         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4922         if (nest == NULL)
4923                 goto nla_put_failure;
4924
4925         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
4926             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4927                           NFT_DATA_VALUE, set->klen) < 0)
4928                 goto nla_put_failure;
4929
4930         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4931             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4932                           NFT_DATA_VALUE, set->klen) < 0)
4933                 goto nla_put_failure;
4934
4935         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4936             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4937                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4938                           set->dlen) < 0)
4939                 goto nla_put_failure;
4940
4941         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4942             nft_set_elem_expr_dump(skb, set, ext))
4943                 goto nla_put_failure;
4944
4945         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4946             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4947                            (*nft_set_ext_obj(ext))->key.name) < 0)
4948                 goto nla_put_failure;
4949
4950         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4951             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4952                          htonl(*nft_set_ext_flags(ext))))
4953                 goto nla_put_failure;
4954
4955         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4956             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4957                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4958                          NFTA_SET_ELEM_PAD))
4959                 goto nla_put_failure;
4960
4961         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4962                 u64 expires, now = get_jiffies_64();
4963
4964                 expires = *nft_set_ext_expiration(ext);
4965                 if (time_before64(now, expires))
4966                         expires -= now;
4967                 else
4968                         expires = 0;
4969
4970                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4971                                  nf_jiffies64_to_msecs(expires),
4972                                  NFTA_SET_ELEM_PAD))
4973                         goto nla_put_failure;
4974         }
4975
4976         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4977                 struct nft_userdata *udata;
4978
4979                 udata = nft_set_ext_userdata(ext);
4980                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4981                             udata->len + 1, udata->data))
4982                         goto nla_put_failure;
4983         }
4984
4985         nla_nest_end(skb, nest);
4986         return 0;
4987
4988 nla_put_failure:
4989         nlmsg_trim(skb, b);
4990         return -EMSGSIZE;
4991 }
4992
4993 struct nft_set_dump_args {
4994         const struct netlink_callback   *cb;
4995         struct nft_set_iter             iter;
4996         struct sk_buff                  *skb;
4997 };
4998
4999 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5000                                   struct nft_set *set,
5001                                   const struct nft_set_iter *iter,
5002                                   struct nft_set_elem *elem)
5003 {
5004         struct nft_set_dump_args *args;
5005
5006         args = container_of(iter, struct nft_set_dump_args, iter);
5007         return nf_tables_fill_setelem(args->skb, set, elem);
5008 }
5009
5010 struct nft_set_dump_ctx {
5011         const struct nft_set    *set;
5012         struct nft_ctx          ctx;
5013 };
5014
5015 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5016                                  const struct nft_set *set)
5017 {
5018         struct nft_set_elem_catchall *catchall;
5019         u8 genmask = nft_genmask_cur(net);
5020         struct nft_set_elem elem;
5021         struct nft_set_ext *ext;
5022         int ret = 0;
5023
5024         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5025                 ext = nft_set_elem_ext(set, catchall->elem);
5026                 if (!nft_set_elem_active(ext, genmask) ||
5027                     nft_set_elem_expired(ext))
5028                         continue;
5029
5030                 elem.priv = catchall->elem;
5031                 ret = nf_tables_fill_setelem(skb, set, &elem);
5032                 break;
5033         }
5034
5035         return ret;
5036 }
5037
5038 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5039 {
5040         struct nft_set_dump_ctx *dump_ctx = cb->data;
5041         struct net *net = sock_net(skb->sk);
5042         struct nftables_pernet *nft_net;
5043         struct nft_table *table;
5044         struct nft_set *set;
5045         struct nft_set_dump_args args;
5046         bool set_found = false;
5047         struct nlmsghdr *nlh;
5048         struct nlattr *nest;
5049         u32 portid, seq;
5050         int event;
5051
5052         rcu_read_lock();
5053         nft_net = nft_pernet(net);
5054         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5055                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5056                     dump_ctx->ctx.family != table->family)
5057                         continue;
5058
5059                 if (table != dump_ctx->ctx.table)
5060                         continue;
5061
5062                 list_for_each_entry_rcu(set, &table->sets, list) {
5063                         if (set == dump_ctx->set) {
5064                                 set_found = true;
5065                                 break;
5066                         }
5067                 }
5068                 break;
5069         }
5070
5071         if (!set_found) {
5072                 rcu_read_unlock();
5073                 return -ENOENT;
5074         }
5075
5076         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5077         portid = NETLINK_CB(cb->skb).portid;
5078         seq    = cb->nlh->nlmsg_seq;
5079
5080         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5081                            table->family, NFNETLINK_V0, nft_base_seq(net));
5082         if (!nlh)
5083                 goto nla_put_failure;
5084
5085         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5086                 goto nla_put_failure;
5087         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5088                 goto nla_put_failure;
5089
5090         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5091         if (nest == NULL)
5092                 goto nla_put_failure;
5093
5094         args.cb                 = cb;
5095         args.skb                = skb;
5096         args.iter.genmask       = nft_genmask_cur(net);
5097         args.iter.skip          = cb->args[0];
5098         args.iter.count         = 0;
5099         args.iter.err           = 0;
5100         args.iter.fn            = nf_tables_dump_setelem;
5101         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5102
5103         if (!args.iter.err && args.iter.count == cb->args[0])
5104                 args.iter.err = nft_set_catchall_dump(net, skb, set);
5105         rcu_read_unlock();
5106
5107         nla_nest_end(skb, nest);
5108         nlmsg_end(skb, nlh);
5109
5110         if (args.iter.err && args.iter.err != -EMSGSIZE)
5111                 return args.iter.err;
5112         if (args.iter.count == cb->args[0])
5113                 return 0;
5114
5115         cb->args[0] = args.iter.count;
5116         return skb->len;
5117
5118 nla_put_failure:
5119         rcu_read_unlock();
5120         return -ENOSPC;
5121 }
5122
5123 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5124 {
5125         struct nft_set_dump_ctx *dump_ctx = cb->data;
5126
5127         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5128
5129         return cb->data ? 0 : -ENOMEM;
5130 }
5131
5132 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5133 {
5134         kfree(cb->data);
5135         return 0;
5136 }
5137
5138 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5139                                        const struct nft_ctx *ctx, u32 seq,
5140                                        u32 portid, int event, u16 flags,
5141                                        const struct nft_set *set,
5142                                        const struct nft_set_elem *elem)
5143 {
5144         struct nlmsghdr *nlh;
5145         struct nlattr *nest;
5146         int err;
5147
5148         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5149         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5150                            NFNETLINK_V0, nft_base_seq(ctx->net));
5151         if (!nlh)
5152                 goto nla_put_failure;
5153
5154         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5155                 goto nla_put_failure;
5156         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5157                 goto nla_put_failure;
5158
5159         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5160         if (nest == NULL)
5161                 goto nla_put_failure;
5162
5163         err = nf_tables_fill_setelem(skb, set, elem);
5164         if (err < 0)
5165                 goto nla_put_failure;
5166
5167         nla_nest_end(skb, nest);
5168
5169         nlmsg_end(skb, nlh);
5170         return 0;
5171
5172 nla_put_failure:
5173         nlmsg_trim(skb, nlh);
5174         return -1;
5175 }
5176
5177 static int nft_setelem_parse_flags(const struct nft_set *set,
5178                                    const struct nlattr *attr, u32 *flags)
5179 {
5180         if (attr == NULL)
5181                 return 0;
5182
5183         *flags = ntohl(nla_get_be32(attr));
5184         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5185                 return -EOPNOTSUPP;
5186         if (!(set->flags & NFT_SET_INTERVAL) &&
5187             *flags & NFT_SET_ELEM_INTERVAL_END)
5188                 return -EINVAL;
5189
5190         return 0;
5191 }
5192
5193 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5194                                  struct nft_data *key, struct nlattr *attr)
5195 {
5196         struct nft_data_desc desc;
5197         int err;
5198
5199         err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
5200         if (err < 0)
5201                 return err;
5202
5203         if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
5204                 nft_data_release(key, desc.type);
5205                 return -EINVAL;
5206         }
5207
5208         return 0;
5209 }
5210
5211 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5212                                   struct nft_data_desc *desc,
5213                                   struct nft_data *data,
5214                                   struct nlattr *attr)
5215 {
5216         u32 dtype;
5217         int err;
5218
5219         err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
5220         if (err < 0)
5221                 return err;
5222
5223         if (set->dtype == NFT_DATA_VERDICT)
5224                 dtype = NFT_DATA_VERDICT;
5225         else
5226                 dtype = NFT_DATA_VALUE;
5227
5228         if (dtype != desc->type ||
5229             set->dlen != desc->len) {
5230                 nft_data_release(data, desc->type);
5231                 return -EINVAL;
5232         }
5233
5234         return 0;
5235 }
5236
5237 static void *nft_setelem_catchall_get(const struct net *net,
5238                                       const struct nft_set *set)
5239 {
5240         struct nft_set_elem_catchall *catchall;
5241         u8 genmask = nft_genmask_cur(net);
5242         struct nft_set_ext *ext;
5243         void *priv = NULL;
5244
5245         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5246                 ext = nft_set_elem_ext(set, catchall->elem);
5247                 if (!nft_set_elem_active(ext, genmask) ||
5248                     nft_set_elem_expired(ext))
5249                         continue;
5250
5251                 priv = catchall->elem;
5252                 break;
5253         }
5254
5255         return priv;
5256 }
5257
5258 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5259                            struct nft_set_elem *elem, u32 flags)
5260 {
5261         void *priv;
5262
5263         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5264                 priv = set->ops->get(ctx->net, set, elem, flags);
5265                 if (IS_ERR(priv))
5266                         return PTR_ERR(priv);
5267         } else {
5268                 priv = nft_setelem_catchall_get(ctx->net, set);
5269                 if (!priv)
5270                         return -ENOENT;
5271         }
5272         elem->priv = priv;
5273
5274         return 0;
5275 }
5276
5277 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5278                             const struct nlattr *attr)
5279 {
5280         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5281         struct nft_set_elem elem;
5282         struct sk_buff *skb;
5283         uint32_t flags = 0;
5284         int err;
5285
5286         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5287                                           nft_set_elem_policy, NULL);
5288         if (err < 0)
5289                 return err;
5290
5291         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5292         if (err < 0)
5293                 return err;
5294
5295         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5296                 return -EINVAL;
5297
5298         if (nla[NFTA_SET_ELEM_KEY]) {
5299                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5300                                             nla[NFTA_SET_ELEM_KEY]);
5301                 if (err < 0)
5302                         return err;
5303         }
5304
5305         if (nla[NFTA_SET_ELEM_KEY_END]) {
5306                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5307                                             nla[NFTA_SET_ELEM_KEY_END]);
5308                 if (err < 0)
5309                         return err;
5310         }
5311
5312         err = nft_setelem_get(ctx, set, &elem, flags);
5313         if (err < 0)
5314                 return err;
5315
5316         err = -ENOMEM;
5317         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5318         if (skb == NULL)
5319                 return err;
5320
5321         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5322                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
5323         if (err < 0)
5324                 goto err_fill_setelem;
5325
5326         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5327
5328 err_fill_setelem:
5329         kfree_skb(skb);
5330         return err;
5331 }
5332
5333 /* called with rcu_read_lock held */
5334 static int nf_tables_getsetelem(struct sk_buff *skb,
5335                                 const struct nfnl_info *info,
5336                                 const struct nlattr * const nla[])
5337 {
5338         struct netlink_ext_ack *extack = info->extack;
5339         u8 genmask = nft_genmask_cur(info->net);
5340         u8 family = info->nfmsg->nfgen_family;
5341         struct net *net = info->net;
5342         struct nft_table *table;
5343         struct nft_set *set;
5344         struct nlattr *attr;
5345         struct nft_ctx ctx;
5346         int rem, err = 0;
5347
5348         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5349                                  genmask, NETLINK_CB(skb).portid);
5350         if (IS_ERR(table)) {
5351                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5352                 return PTR_ERR(table);
5353         }
5354
5355         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5356         if (IS_ERR(set))
5357                 return PTR_ERR(set);
5358
5359         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5360
5361         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5362                 struct netlink_dump_control c = {
5363                         .start = nf_tables_dump_set_start,
5364                         .dump = nf_tables_dump_set,
5365                         .done = nf_tables_dump_set_done,
5366                         .module = THIS_MODULE,
5367                 };
5368                 struct nft_set_dump_ctx dump_ctx = {
5369                         .set = set,
5370                         .ctx = ctx,
5371                 };
5372
5373                 c.data = &dump_ctx;
5374                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5375         }
5376
5377         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5378                 return -EINVAL;
5379
5380         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5381                 err = nft_get_set_elem(&ctx, set, attr);
5382                 if (err < 0) {
5383                         NL_SET_BAD_ATTR(extack, attr);
5384                         break;
5385                 }
5386         }
5387
5388         return err;
5389 }
5390
5391 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5392                                      const struct nft_set *set,
5393                                      const struct nft_set_elem *elem,
5394                                      int event)
5395 {
5396         struct nftables_pernet *nft_net;
5397         struct net *net = ctx->net;
5398         u32 portid = ctx->portid;
5399         struct sk_buff *skb;
5400         u16 flags = 0;
5401         int err;
5402
5403         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5404                 return;
5405
5406         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5407         if (skb == NULL)
5408                 goto err;
5409
5410         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5411                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5412
5413         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5414                                           set, elem);
5415         if (err < 0) {
5416                 kfree_skb(skb);
5417                 goto err;
5418         }
5419
5420         nft_net = nft_pernet(net);
5421         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5422         return;
5423 err:
5424         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5425 }
5426
5427 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5428                                               int msg_type,
5429                                               struct nft_set *set)
5430 {
5431         struct nft_trans *trans;
5432
5433         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5434         if (trans == NULL)
5435                 return NULL;
5436
5437         nft_trans_elem_set(trans) = set;
5438         return trans;
5439 }
5440
5441 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5442                                          const struct nft_set *set,
5443                                          const struct nlattr *attr)
5444 {
5445         struct nft_expr *expr;
5446         int err;
5447
5448         expr = nft_expr_init(ctx, attr);
5449         if (IS_ERR(expr))
5450                 return expr;
5451
5452         err = -EOPNOTSUPP;
5453         if (expr->ops->type->flags & NFT_EXPR_GC) {
5454                 if (set->flags & NFT_SET_TIMEOUT)
5455                         goto err_set_elem_expr;
5456                 if (!set->ops->gc_init)
5457                         goto err_set_elem_expr;
5458                 set->ops->gc_init(set);
5459         }
5460
5461         return expr;
5462
5463 err_set_elem_expr:
5464         nft_expr_destroy(ctx, expr);
5465         return ERR_PTR(err);
5466 }
5467
5468 void *nft_set_elem_init(const struct nft_set *set,
5469                         const struct nft_set_ext_tmpl *tmpl,
5470                         const u32 *key, const u32 *key_end,
5471                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5472 {
5473         struct nft_set_ext *ext;
5474         void *elem;
5475
5476         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5477         if (elem == NULL)
5478                 return NULL;
5479
5480         ext = nft_set_elem_ext(set, elem);
5481         nft_set_ext_init(ext, tmpl);
5482
5483         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY))
5484                 memcpy(nft_set_ext_key(ext), key, set->klen);
5485         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5486                 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5487         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5488                 memcpy(nft_set_ext_data(ext), data, set->dlen);
5489         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5490                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5491                 if (expiration == 0)
5492                         *nft_set_ext_expiration(ext) += timeout;
5493         }
5494         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5495                 *nft_set_ext_timeout(ext) = timeout;
5496
5497         return elem;
5498 }
5499
5500 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5501                                         struct nft_expr *expr)
5502 {
5503         if (expr->ops->destroy_clone) {
5504                 expr->ops->destroy_clone(ctx, expr);
5505                 module_put(expr->ops->type->owner);
5506         } else {
5507                 nf_tables_expr_destroy(ctx, expr);
5508         }
5509 }
5510
5511 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5512                                       struct nft_set_elem_expr *elem_expr)
5513 {
5514         struct nft_expr *expr;
5515         u32 size;
5516
5517         nft_setelem_expr_foreach(expr, elem_expr, size)
5518                 __nft_set_elem_expr_destroy(ctx, expr);
5519 }
5520
5521 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5522                           bool destroy_expr)
5523 {
5524         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5525         struct nft_ctx ctx = {
5526                 .net    = read_pnet(&set->net),
5527                 .family = set->table->family,
5528         };
5529
5530         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5531         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5532                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5533         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5534                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5535
5536         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5537                 (*nft_set_ext_obj(ext))->use--;
5538         kfree(elem);
5539 }
5540 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5541
5542 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5543  * with the refcounting from the preparation phase.
5544  */
5545 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5546                                        const struct nft_set *set, void *elem)
5547 {
5548         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5549
5550         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5551                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5552
5553         kfree(elem);
5554 }
5555
5556 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5557                             struct nft_expr *expr_array[])
5558 {
5559         struct nft_expr *expr;
5560         int err, i, k;
5561
5562         for (i = 0; i < set->num_exprs; i++) {
5563                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
5564                 if (!expr)
5565                         goto err_expr;
5566
5567                 err = nft_expr_clone(expr, set->exprs[i]);
5568                 if (err < 0) {
5569                         nft_expr_destroy(ctx, expr);
5570                         goto err_expr;
5571                 }
5572                 expr_array[i] = expr;
5573         }
5574
5575         return 0;
5576
5577 err_expr:
5578         for (k = i - 1; k >= 0; k--)
5579                 nft_expr_destroy(ctx, expr_array[k]);
5580
5581         return -ENOMEM;
5582 }
5583
5584 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5585                                    const struct nft_set_ext *ext,
5586                                    struct nft_expr *expr_array[],
5587                                    u32 num_exprs)
5588 {
5589         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5590         struct nft_expr *expr;
5591         int i, err;
5592
5593         for (i = 0; i < num_exprs; i++) {
5594                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5595                 err = nft_expr_clone(expr, expr_array[i]);
5596                 if (err < 0)
5597                         goto err_elem_expr_setup;
5598
5599                 elem_expr->size += expr_array[i]->ops->size;
5600                 nft_expr_destroy(ctx, expr_array[i]);
5601                 expr_array[i] = NULL;
5602         }
5603
5604         return 0;
5605
5606 err_elem_expr_setup:
5607         for (; i < num_exprs; i++) {
5608                 nft_expr_destroy(ctx, expr_array[i]);
5609                 expr_array[i] = NULL;
5610         }
5611
5612         return -ENOMEM;
5613 }
5614
5615 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5616                                             const struct nft_set *set)
5617 {
5618         struct nft_set_elem_catchall *catchall;
5619         u8 genmask = nft_genmask_cur(net);
5620         struct nft_set_ext *ext;
5621
5622         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5623                 ext = nft_set_elem_ext(set, catchall->elem);
5624                 if (nft_set_elem_active(ext, genmask) &&
5625                     !nft_set_elem_expired(ext))
5626                         return ext;
5627         }
5628
5629         return NULL;
5630 }
5631 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5632
5633 void *nft_set_catchall_gc(const struct nft_set *set)
5634 {
5635         struct nft_set_elem_catchall *catchall, *next;
5636         struct nft_set_ext *ext;
5637         void *elem = NULL;
5638
5639         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5640                 ext = nft_set_elem_ext(set, catchall->elem);
5641
5642                 if (!nft_set_elem_expired(ext) ||
5643                     nft_set_elem_mark_busy(ext))
5644                         continue;
5645
5646                 elem = catchall->elem;
5647                 list_del_rcu(&catchall->list);
5648                 kfree_rcu(catchall, rcu);
5649                 break;
5650         }
5651
5652         return elem;
5653 }
5654 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5655
5656 static int nft_setelem_catchall_insert(const struct net *net,
5657                                        struct nft_set *set,
5658                                        const struct nft_set_elem *elem,
5659                                        struct nft_set_ext **pext)
5660 {
5661         struct nft_set_elem_catchall *catchall;
5662         u8 genmask = nft_genmask_next(net);
5663         struct nft_set_ext *ext;
5664
5665         list_for_each_entry(catchall, &set->catchall_list, list) {
5666                 ext = nft_set_elem_ext(set, catchall->elem);
5667                 if (nft_set_elem_active(ext, genmask)) {
5668                         *pext = ext;
5669                         return -EEXIST;
5670                 }
5671         }
5672
5673         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5674         if (!catchall)
5675                 return -ENOMEM;
5676
5677         catchall->elem = elem->priv;
5678         list_add_tail_rcu(&catchall->list, &set->catchall_list);
5679
5680         return 0;
5681 }
5682
5683 static int nft_setelem_insert(const struct net *net,
5684                               struct nft_set *set,
5685                               const struct nft_set_elem *elem,
5686                               struct nft_set_ext **ext, unsigned int flags)
5687 {
5688         int ret;
5689
5690         if (flags & NFT_SET_ELEM_CATCHALL)
5691                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5692         else
5693                 ret = set->ops->insert(net, set, elem, ext);
5694
5695         return ret;
5696 }
5697
5698 static bool nft_setelem_is_catchall(const struct nft_set *set,
5699                                     const struct nft_set_elem *elem)
5700 {
5701         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5702
5703         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5704             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5705                 return true;
5706
5707         return false;
5708 }
5709
5710 static void nft_setelem_activate(struct net *net, struct nft_set *set,
5711                                  struct nft_set_elem *elem)
5712 {
5713         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5714
5715         if (nft_setelem_is_catchall(set, elem)) {
5716                 nft_set_elem_change_active(net, set, ext);
5717                 nft_set_elem_clear_busy(ext);
5718         } else {
5719                 set->ops->activate(net, set, elem);
5720         }
5721 }
5722
5723 static int nft_setelem_catchall_deactivate(const struct net *net,
5724                                            struct nft_set *set,
5725                                            struct nft_set_elem *elem)
5726 {
5727         struct nft_set_elem_catchall *catchall;
5728         struct nft_set_ext *ext;
5729
5730         list_for_each_entry(catchall, &set->catchall_list, list) {
5731                 ext = nft_set_elem_ext(set, catchall->elem);
5732                 if (!nft_is_active(net, ext) ||
5733                     nft_set_elem_mark_busy(ext))
5734                         continue;
5735
5736                 kfree(elem->priv);
5737                 elem->priv = catchall->elem;
5738                 nft_set_elem_change_active(net, set, ext);
5739                 return 0;
5740         }
5741
5742         return -ENOENT;
5743 }
5744
5745 static int __nft_setelem_deactivate(const struct net *net,
5746                                     struct nft_set *set,
5747                                     struct nft_set_elem *elem)
5748 {
5749         void *priv;
5750
5751         priv = set->ops->deactivate(net, set, elem);
5752         if (!priv)
5753                 return -ENOENT;
5754
5755         kfree(elem->priv);
5756         elem->priv = priv;
5757         set->ndeact++;
5758
5759         return 0;
5760 }
5761
5762 static int nft_setelem_deactivate(const struct net *net,
5763                                   struct nft_set *set,
5764                                   struct nft_set_elem *elem, u32 flags)
5765 {
5766         int ret;
5767
5768         if (flags & NFT_SET_ELEM_CATCHALL)
5769                 ret = nft_setelem_catchall_deactivate(net, set, elem);
5770         else
5771                 ret = __nft_setelem_deactivate(net, set, elem);
5772
5773         return ret;
5774 }
5775
5776 static void nft_setelem_catchall_remove(const struct net *net,
5777                                         const struct nft_set *set,
5778                                         const struct nft_set_elem *elem)
5779 {
5780         struct nft_set_elem_catchall *catchall, *next;
5781
5782         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5783                 if (catchall->elem == elem->priv) {
5784                         list_del_rcu(&catchall->list);
5785                         kfree_rcu(catchall, rcu);
5786                         break;
5787                 }
5788         }
5789 }
5790
5791 static void nft_setelem_remove(const struct net *net,
5792                                const struct nft_set *set,
5793                                const struct nft_set_elem *elem)
5794 {
5795         if (nft_setelem_is_catchall(set, elem))
5796                 nft_setelem_catchall_remove(net, set, elem);
5797         else
5798                 set->ops->remove(net, set, elem);
5799 }
5800
5801 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5802                             const struct nlattr *attr, u32 nlmsg_flags)
5803 {
5804         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5805         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5806         u8 genmask = nft_genmask_next(ctx->net);
5807         u32 flags = 0, size = 0, num_exprs = 0;
5808         struct nft_set_ext_tmpl tmpl;
5809         struct nft_set_ext *ext, *ext2;
5810         struct nft_set_elem elem;
5811         struct nft_set_binding *binding;
5812         struct nft_object *obj = NULL;
5813         struct nft_userdata *udata;
5814         struct nft_data_desc desc;
5815         enum nft_registers dreg;
5816         struct nft_trans *trans;
5817         u64 timeout;
5818         u64 expiration;
5819         int err, i;
5820         u8 ulen;
5821
5822         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5823                                           nft_set_elem_policy, NULL);
5824         if (err < 0)
5825                 return err;
5826
5827         nft_set_ext_prepare(&tmpl);
5828
5829         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5830         if (err < 0)
5831                 return err;
5832
5833         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5834                 return -EINVAL;
5835
5836         if (flags != 0) {
5837                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5838                 if (err < 0)
5839                         return err;
5840         }
5841
5842         if (set->flags & NFT_SET_MAP) {
5843                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5844                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5845                         return -EINVAL;
5846         } else {
5847                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5848                         return -EINVAL;
5849         }
5850
5851         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5852              (nla[NFTA_SET_ELEM_DATA] ||
5853               nla[NFTA_SET_ELEM_OBJREF] ||
5854               nla[NFTA_SET_ELEM_TIMEOUT] ||
5855               nla[NFTA_SET_ELEM_EXPIRATION] ||
5856               nla[NFTA_SET_ELEM_USERDATA] ||
5857               nla[NFTA_SET_ELEM_EXPR] ||
5858               nla[NFTA_SET_ELEM_EXPRESSIONS]))
5859                 return -EINVAL;
5860
5861         timeout = 0;
5862         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5863                 if (!(set->flags & NFT_SET_TIMEOUT))
5864                         return -EINVAL;
5865                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5866                                             &timeout);
5867                 if (err)
5868                         return err;
5869         } else if (set->flags & NFT_SET_TIMEOUT) {
5870                 timeout = set->timeout;
5871         }
5872
5873         expiration = 0;
5874         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5875                 if (!(set->flags & NFT_SET_TIMEOUT))
5876                         return -EINVAL;
5877                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5878                                             &expiration);
5879                 if (err)
5880                         return err;
5881         }
5882
5883         if (nla[NFTA_SET_ELEM_EXPR]) {
5884                 struct nft_expr *expr;
5885
5886                 if (set->num_exprs && set->num_exprs != 1)
5887                         return -EOPNOTSUPP;
5888
5889                 expr = nft_set_elem_expr_alloc(ctx, set,
5890                                                nla[NFTA_SET_ELEM_EXPR]);
5891                 if (IS_ERR(expr))
5892                         return PTR_ERR(expr);
5893
5894                 expr_array[0] = expr;
5895                 num_exprs = 1;
5896
5897                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
5898                         err = -EOPNOTSUPP;
5899                         goto err_set_elem_expr;
5900                 }
5901         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5902                 struct nft_expr *expr;
5903                 struct nlattr *tmp;
5904                 int left;
5905
5906                 i = 0;
5907                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
5908                         if (i == NFT_SET_EXPR_MAX ||
5909                             (set->num_exprs && set->num_exprs == i)) {
5910                                 err = -E2BIG;
5911                                 goto err_set_elem_expr;
5912                         }
5913                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
5914                                 err = -EINVAL;
5915                                 goto err_set_elem_expr;
5916                         }
5917                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5918                         if (IS_ERR(expr)) {
5919                                 err = PTR_ERR(expr);
5920                                 goto err_set_elem_expr;
5921                         }
5922                         expr_array[i] = expr;
5923                         num_exprs++;
5924
5925                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
5926                                 err = -EOPNOTSUPP;
5927                                 goto err_set_elem_expr;
5928                         }
5929                         i++;
5930                 }
5931                 if (set->num_exprs && set->num_exprs != i) {
5932                         err = -EOPNOTSUPP;
5933                         goto err_set_elem_expr;
5934                 }
5935         } else if (set->num_exprs > 0) {
5936                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5937                 if (err < 0)
5938                         goto err_set_elem_expr_clone;
5939
5940                 num_exprs = set->num_exprs;
5941         }
5942
5943         if (nla[NFTA_SET_ELEM_KEY]) {
5944                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5945                                             nla[NFTA_SET_ELEM_KEY]);
5946                 if (err < 0)
5947                         goto err_set_elem_expr;
5948
5949                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5950                 if (err < 0)
5951                         goto err_parse_key;
5952         }
5953
5954         if (nla[NFTA_SET_ELEM_KEY_END]) {
5955                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5956                                             nla[NFTA_SET_ELEM_KEY_END]);
5957                 if (err < 0)
5958                         goto err_parse_key;
5959
5960                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5961                 if (err < 0)
5962                         goto err_parse_key_end;
5963         }
5964
5965         if (timeout > 0) {
5966                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5967                 if (err < 0)
5968                         goto err_parse_key_end;
5969
5970                 if (timeout != set->timeout) {
5971                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5972                         if (err < 0)
5973                                 goto err_parse_key_end;
5974                 }
5975         }
5976
5977         if (num_exprs) {
5978                 for (i = 0; i < num_exprs; i++)
5979                         size += expr_array[i]->ops->size;
5980
5981                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
5982                                              sizeof(struct nft_set_elem_expr) + size);
5983                 if (err < 0)
5984                         goto err_parse_key_end;
5985         }
5986
5987         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5988                 if (!(set->flags & NFT_SET_OBJECT)) {
5989                         err = -EINVAL;
5990                         goto err_parse_key_end;
5991                 }
5992                 obj = nft_obj_lookup(ctx->net, ctx->table,
5993                                      nla[NFTA_SET_ELEM_OBJREF],
5994                                      set->objtype, genmask);
5995                 if (IS_ERR(obj)) {
5996                         err = PTR_ERR(obj);
5997                         goto err_parse_key_end;
5998                 }
5999                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6000                 if (err < 0)
6001                         goto err_parse_key_end;
6002         }
6003
6004         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6005                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6006                                              nla[NFTA_SET_ELEM_DATA]);
6007                 if (err < 0)
6008                         goto err_parse_key_end;
6009
6010                 dreg = nft_type_to_reg(set->dtype);
6011                 list_for_each_entry(binding, &set->bindings, list) {
6012                         struct nft_ctx bind_ctx = {
6013                                 .net    = ctx->net,
6014                                 .family = ctx->family,
6015                                 .table  = ctx->table,
6016                                 .chain  = (struct nft_chain *)binding->chain,
6017                         };
6018
6019                         if (!(binding->flags & NFT_SET_MAP))
6020                                 continue;
6021
6022                         err = nft_validate_register_store(&bind_ctx, dreg,
6023                                                           &elem.data.val,
6024                                                           desc.type, desc.len);
6025                         if (err < 0)
6026                                 goto err_parse_data;
6027
6028                         if (desc.type == NFT_DATA_VERDICT &&
6029                             (elem.data.val.verdict.code == NFT_GOTO ||
6030                              elem.data.val.verdict.code == NFT_JUMP))
6031                                 nft_validate_state_update(ctx->net,
6032                                                           NFT_VALIDATE_NEED);
6033                 }
6034
6035                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6036                 if (err < 0)
6037                         goto err_parse_data;
6038         }
6039
6040         /* The full maximum length of userdata can exceed the maximum
6041          * offset value (U8_MAX) for following extensions, therefor it
6042          * must be the last extension added.
6043          */
6044         ulen = 0;
6045         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6046                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6047                 if (ulen > 0) {
6048                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6049                                                      ulen);
6050                         if (err < 0)
6051                                 goto err_parse_data;
6052                 }
6053         }
6054
6055         err = -ENOMEM;
6056         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6057                                       elem.key_end.val.data, elem.data.val.data,
6058                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6059         if (elem.priv == NULL)
6060                 goto err_parse_data;
6061
6062         ext = nft_set_elem_ext(set, elem.priv);
6063         if (flags)
6064                 *nft_set_ext_flags(ext) = flags;
6065         if (ulen > 0) {
6066                 udata = nft_set_ext_userdata(ext);
6067                 udata->len = ulen - 1;
6068                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6069         }
6070         if (obj) {
6071                 *nft_set_ext_obj(ext) = obj;
6072                 obj->use++;
6073         }
6074         err = nft_set_elem_expr_setup(ctx, ext, expr_array, num_exprs);
6075         if (err < 0)
6076                 goto err_elem_expr;
6077
6078         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6079         if (trans == NULL) {
6080                 err = -ENOMEM;
6081                 goto err_elem_expr;
6082         }
6083
6084         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6085
6086         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6087         if (err) {
6088                 if (err == -EEXIST) {
6089                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6090                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6091                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6092                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6093                                 goto err_element_clash;
6094                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6095                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6096                              memcmp(nft_set_ext_data(ext),
6097                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6098                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6099                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6100                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6101                                 goto err_element_clash;
6102                         else if (!(nlmsg_flags & NLM_F_EXCL))
6103                                 err = 0;
6104                 } else if (err == -ENOTEMPTY) {
6105                         /* ENOTEMPTY reports overlapping between this element
6106                          * and an existing one.
6107                          */
6108                         err = -EEXIST;
6109                 }
6110                 goto err_element_clash;
6111         }
6112
6113         if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6114             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6115                 err = -ENFILE;
6116                 goto err_set_full;
6117         }
6118
6119         nft_trans_elem(trans) = elem;
6120         nft_trans_commit_list_add_tail(ctx->net, trans);
6121         return 0;
6122
6123 err_set_full:
6124         nft_setelem_remove(ctx->net, set, &elem);
6125 err_element_clash:
6126         kfree(trans);
6127 err_elem_expr:
6128         if (obj)
6129                 obj->use--;
6130
6131         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6132 err_parse_data:
6133         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6134                 nft_data_release(&elem.data.val, desc.type);
6135 err_parse_key_end:
6136         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6137 err_parse_key:
6138         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6139 err_set_elem_expr:
6140         for (i = 0; i < num_exprs && expr_array[i]; i++)
6141                 nft_expr_destroy(ctx, expr_array[i]);
6142 err_set_elem_expr_clone:
6143         return err;
6144 }
6145
6146 static int nf_tables_newsetelem(struct sk_buff *skb,
6147                                 const struct nfnl_info *info,
6148                                 const struct nlattr * const nla[])
6149 {
6150         struct nftables_pernet *nft_net = nft_pernet(info->net);
6151         struct netlink_ext_ack *extack = info->extack;
6152         u8 genmask = nft_genmask_next(info->net);
6153         u8 family = info->nfmsg->nfgen_family;
6154         struct net *net = info->net;
6155         const struct nlattr *attr;
6156         struct nft_table *table;
6157         struct nft_set *set;
6158         struct nft_ctx ctx;
6159         int rem, err;
6160
6161         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6162                 return -EINVAL;
6163
6164         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6165                                  genmask, NETLINK_CB(skb).portid);
6166         if (IS_ERR(table)) {
6167                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6168                 return PTR_ERR(table);
6169         }
6170
6171         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6172                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6173         if (IS_ERR(set))
6174                 return PTR_ERR(set);
6175
6176         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6177                 return -EBUSY;
6178
6179         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6180
6181         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6182                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6183                 if (err < 0) {
6184                         NL_SET_BAD_ATTR(extack, attr);
6185                         return err;
6186                 }
6187         }
6188
6189         if (nft_net->validate_state == NFT_VALIDATE_DO)
6190                 return nft_table_validate(net, table);
6191
6192         return 0;
6193 }
6194
6195 /**
6196  *      nft_data_hold - hold a nft_data item
6197  *
6198  *      @data: struct nft_data to release
6199  *      @type: type of data
6200  *
6201  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6202  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6203  *      NFT_GOTO verdicts. This function must be called on active data objects
6204  *      from the second phase of the commit protocol.
6205  */
6206 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6207 {
6208         struct nft_chain *chain;
6209         struct nft_rule *rule;
6210
6211         if (type == NFT_DATA_VERDICT) {
6212                 switch (data->verdict.code) {
6213                 case NFT_JUMP:
6214                 case NFT_GOTO:
6215                         chain = data->verdict.chain;
6216                         chain->use++;
6217
6218                         if (!nft_chain_is_bound(chain))
6219                                 break;
6220
6221                         chain->table->use++;
6222                         list_for_each_entry(rule, &chain->rules, list)
6223                                 chain->use++;
6224
6225                         nft_chain_add(chain->table, chain);
6226                         break;
6227                 }
6228         }
6229 }
6230
6231 static void nft_setelem_data_activate(const struct net *net,
6232                                       const struct nft_set *set,
6233                                       struct nft_set_elem *elem)
6234 {
6235         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6236
6237         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6238                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6239         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6240                 (*nft_set_ext_obj(ext))->use++;
6241 }
6242
6243 static void nft_setelem_data_deactivate(const struct net *net,
6244                                         const struct nft_set *set,
6245                                         struct nft_set_elem *elem)
6246 {
6247         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6248
6249         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6250                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6251         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6252                 (*nft_set_ext_obj(ext))->use--;
6253 }
6254
6255 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6256                            const struct nlattr *attr)
6257 {
6258         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6259         struct nft_set_ext_tmpl tmpl;
6260         struct nft_set_elem elem;
6261         struct nft_set_ext *ext;
6262         struct nft_trans *trans;
6263         u32 flags = 0;
6264         int err;
6265
6266         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6267                                           nft_set_elem_policy, NULL);
6268         if (err < 0)
6269                 return err;
6270
6271         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6272         if (err < 0)
6273                 return err;
6274
6275         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6276                 return -EINVAL;
6277
6278         nft_set_ext_prepare(&tmpl);
6279
6280         if (flags != 0) {
6281                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6282                 if (err < 0)
6283                         return err;
6284         }
6285
6286         if (nla[NFTA_SET_ELEM_KEY]) {
6287                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6288                                             nla[NFTA_SET_ELEM_KEY]);
6289                 if (err < 0)
6290                         return err;
6291
6292                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6293                 if (err < 0)
6294                         goto fail_elem;
6295         }
6296
6297         if (nla[NFTA_SET_ELEM_KEY_END]) {
6298                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6299                                             nla[NFTA_SET_ELEM_KEY_END]);
6300                 if (err < 0)
6301                         goto fail_elem;
6302
6303                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6304                 if (err < 0)
6305                         goto fail_elem_key_end;
6306         }
6307
6308         err = -ENOMEM;
6309         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6310                                       elem.key_end.val.data, NULL, 0, 0,
6311                                       GFP_KERNEL_ACCOUNT);
6312         if (elem.priv == NULL)
6313                 goto fail_elem_key_end;
6314
6315         ext = nft_set_elem_ext(set, elem.priv);
6316         if (flags)
6317                 *nft_set_ext_flags(ext) = flags;
6318
6319         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6320         if (trans == NULL)
6321                 goto fail_trans;
6322
6323         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6324         if (err < 0)
6325                 goto fail_ops;
6326
6327         nft_setelem_data_deactivate(ctx->net, set, &elem);
6328
6329         nft_trans_elem(trans) = elem;
6330         nft_trans_commit_list_add_tail(ctx->net, trans);
6331         return 0;
6332
6333 fail_ops:
6334         kfree(trans);
6335 fail_trans:
6336         kfree(elem.priv);
6337 fail_elem_key_end:
6338         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6339 fail_elem:
6340         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6341         return err;
6342 }
6343
6344 static int nft_setelem_flush(const struct nft_ctx *ctx,
6345                              struct nft_set *set,
6346                              const struct nft_set_iter *iter,
6347                              struct nft_set_elem *elem)
6348 {
6349         struct nft_trans *trans;
6350         int err;
6351
6352         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6353                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
6354         if (!trans)
6355                 return -ENOMEM;
6356
6357         if (!set->ops->flush(ctx->net, set, elem->priv)) {
6358                 err = -ENOENT;
6359                 goto err1;
6360         }
6361         set->ndeact++;
6362
6363         nft_setelem_data_deactivate(ctx->net, set, elem);
6364         nft_trans_elem_set(trans) = set;
6365         nft_trans_elem(trans) = *elem;
6366         nft_trans_commit_list_add_tail(ctx->net, trans);
6367
6368         return 0;
6369 err1:
6370         kfree(trans);
6371         return err;
6372 }
6373
6374 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6375                                     struct nft_set *set,
6376                                     struct nft_set_elem *elem)
6377 {
6378         struct nft_trans *trans;
6379
6380         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6381                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
6382         if (!trans)
6383                 return -ENOMEM;
6384
6385         nft_setelem_data_deactivate(ctx->net, set, elem);
6386         nft_trans_elem_set(trans) = set;
6387         nft_trans_elem(trans) = *elem;
6388         nft_trans_commit_list_add_tail(ctx->net, trans);
6389
6390         return 0;
6391 }
6392
6393 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6394                                   struct nft_set *set)
6395 {
6396         u8 genmask = nft_genmask_next(ctx->net);
6397         struct nft_set_elem_catchall *catchall;
6398         struct nft_set_elem elem;
6399         struct nft_set_ext *ext;
6400         int ret = 0;
6401
6402         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6403                 ext = nft_set_elem_ext(set, catchall->elem);
6404                 if (!nft_set_elem_active(ext, genmask) ||
6405                     nft_set_elem_mark_busy(ext))
6406                         continue;
6407
6408                 elem.priv = catchall->elem;
6409                 ret = __nft_set_catchall_flush(ctx, set, &elem);
6410                 if (ret < 0)
6411                         break;
6412         }
6413
6414         return ret;
6415 }
6416
6417 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6418 {
6419         struct nft_set_iter iter = {
6420                 .genmask        = genmask,
6421                 .fn             = nft_setelem_flush,
6422         };
6423
6424         set->ops->walk(ctx, set, &iter);
6425         if (!iter.err)
6426                 iter.err = nft_set_catchall_flush(ctx, set);
6427
6428         return iter.err;
6429 }
6430
6431 static int nf_tables_delsetelem(struct sk_buff *skb,
6432                                 const struct nfnl_info *info,
6433                                 const struct nlattr * const nla[])
6434 {
6435         struct netlink_ext_ack *extack = info->extack;
6436         u8 genmask = nft_genmask_next(info->net);
6437         u8 family = info->nfmsg->nfgen_family;
6438         struct net *net = info->net;
6439         const struct nlattr *attr;
6440         struct nft_table *table;
6441         struct nft_set *set;
6442         struct nft_ctx ctx;
6443         int rem, err = 0;
6444
6445         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6446                                  genmask, NETLINK_CB(skb).portid);
6447         if (IS_ERR(table)) {
6448                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6449                 return PTR_ERR(table);
6450         }
6451
6452         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6453         if (IS_ERR(set))
6454                 return PTR_ERR(set);
6455         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6456                 return -EBUSY;
6457
6458         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6459
6460         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6461                 return nft_set_flush(&ctx, set, genmask);
6462
6463         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6464                 err = nft_del_setelem(&ctx, set, attr);
6465                 if (err < 0) {
6466                         NL_SET_BAD_ATTR(extack, attr);
6467                         break;
6468                 }
6469         }
6470         return err;
6471 }
6472
6473 void nft_set_gc_batch_release(struct rcu_head *rcu)
6474 {
6475         struct nft_set_gc_batch *gcb;
6476         unsigned int i;
6477
6478         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6479         for (i = 0; i < gcb->head.cnt; i++)
6480                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6481         kfree(gcb);
6482 }
6483
6484 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6485                                                 gfp_t gfp)
6486 {
6487         struct nft_set_gc_batch *gcb;
6488
6489         gcb = kzalloc(sizeof(*gcb), gfp);
6490         if (gcb == NULL)
6491                 return gcb;
6492         gcb->head.set = set;
6493         return gcb;
6494 }
6495
6496 /*
6497  * Stateful objects
6498  */
6499
6500 /**
6501  *      nft_register_obj- register nf_tables stateful object type
6502  *      @obj_type: object type
6503  *
6504  *      Registers the object type for use with nf_tables. Returns zero on
6505  *      success or a negative errno code otherwise.
6506  */
6507 int nft_register_obj(struct nft_object_type *obj_type)
6508 {
6509         if (obj_type->type == NFT_OBJECT_UNSPEC)
6510                 return -EINVAL;
6511
6512         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6513         list_add_rcu(&obj_type->list, &nf_tables_objects);
6514         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6515         return 0;
6516 }
6517 EXPORT_SYMBOL_GPL(nft_register_obj);
6518
6519 /**
6520  *      nft_unregister_obj - unregister nf_tables object type
6521  *      @obj_type: object type
6522  *
6523  *      Unregisters the object type for use with nf_tables.
6524  */
6525 void nft_unregister_obj(struct nft_object_type *obj_type)
6526 {
6527         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6528         list_del_rcu(&obj_type->list);
6529         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6530 }
6531 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6532
6533 struct nft_object *nft_obj_lookup(const struct net *net,
6534                                   const struct nft_table *table,
6535                                   const struct nlattr *nla, u32 objtype,
6536                                   u8 genmask)
6537 {
6538         struct nft_object_hash_key k = { .table = table };
6539         char search[NFT_OBJ_MAXNAMELEN];
6540         struct rhlist_head *tmp, *list;
6541         struct nft_object *obj;
6542
6543         nla_strscpy(search, nla, sizeof(search));
6544         k.name = search;
6545
6546         WARN_ON_ONCE(!rcu_read_lock_held() &&
6547                      !lockdep_commit_lock_is_held(net));
6548
6549         rcu_read_lock();
6550         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6551         if (!list)
6552                 goto out;
6553
6554         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6555                 if (objtype == obj->ops->type->type &&
6556                     nft_active_genmask(obj, genmask)) {
6557                         rcu_read_unlock();
6558                         return obj;
6559                 }
6560         }
6561 out:
6562         rcu_read_unlock();
6563         return ERR_PTR(-ENOENT);
6564 }
6565 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6566
6567 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6568                                                   const struct nlattr *nla,
6569                                                   u32 objtype, u8 genmask)
6570 {
6571         struct nft_object *obj;
6572
6573         list_for_each_entry(obj, &table->objects, list) {
6574                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6575                     objtype == obj->ops->type->type &&
6576                     nft_active_genmask(obj, genmask))
6577                         return obj;
6578         }
6579         return ERR_PTR(-ENOENT);
6580 }
6581
6582 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6583         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
6584                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
6585         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
6586                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
6587         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
6588         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
6589         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
6590         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
6591                                     .len = NFT_USERDATA_MAXLEN },
6592 };
6593
6594 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6595                                        const struct nft_object_type *type,
6596                                        const struct nlattr *attr)
6597 {
6598         struct nlattr **tb;
6599         const struct nft_object_ops *ops;
6600         struct nft_object *obj;
6601         int err = -ENOMEM;
6602
6603         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6604         if (!tb)
6605                 goto err1;
6606
6607         if (attr) {
6608                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6609                                                   type->policy, NULL);
6610                 if (err < 0)
6611                         goto err2;
6612         } else {
6613                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6614         }
6615
6616         if (type->select_ops) {
6617                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6618                 if (IS_ERR(ops)) {
6619                         err = PTR_ERR(ops);
6620                         goto err2;
6621                 }
6622         } else {
6623                 ops = type->ops;
6624         }
6625
6626         err = -ENOMEM;
6627         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
6628         if (!obj)
6629                 goto err2;
6630
6631         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6632         if (err < 0)
6633                 goto err3;
6634
6635         obj->ops = ops;
6636
6637         kfree(tb);
6638         return obj;
6639 err3:
6640         kfree(obj);
6641 err2:
6642         kfree(tb);
6643 err1:
6644         return ERR_PTR(err);
6645 }
6646
6647 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6648                            struct nft_object *obj, bool reset)
6649 {
6650         struct nlattr *nest;
6651
6652         nest = nla_nest_start_noflag(skb, attr);
6653         if (!nest)
6654                 goto nla_put_failure;
6655         if (obj->ops->dump(skb, obj, reset) < 0)
6656                 goto nla_put_failure;
6657         nla_nest_end(skb, nest);
6658         return 0;
6659
6660 nla_put_failure:
6661         return -1;
6662 }
6663
6664 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6665 {
6666         const struct nft_object_type *type;
6667
6668         list_for_each_entry(type, &nf_tables_objects, list) {
6669                 if (objtype == type->type)
6670                         return type;
6671         }
6672         return NULL;
6673 }
6674
6675 static const struct nft_object_type *
6676 nft_obj_type_get(struct net *net, u32 objtype)
6677 {
6678         const struct nft_object_type *type;
6679
6680         type = __nft_obj_type_get(objtype);
6681         if (type != NULL && try_module_get(type->owner))
6682                 return type;
6683
6684         lockdep_nfnl_nft_mutex_not_held();
6685 #ifdef CONFIG_MODULES
6686         if (type == NULL) {
6687                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6688                         return ERR_PTR(-EAGAIN);
6689         }
6690 #endif
6691         return ERR_PTR(-ENOENT);
6692 }
6693
6694 static int nf_tables_updobj(const struct nft_ctx *ctx,
6695                             const struct nft_object_type *type,
6696                             const struct nlattr *attr,
6697                             struct nft_object *obj)
6698 {
6699         struct nft_object *newobj;
6700         struct nft_trans *trans;
6701         int err = -ENOMEM;
6702
6703         if (!try_module_get(type->owner))
6704                 return -ENOENT;
6705
6706         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6707                                 sizeof(struct nft_trans_obj));
6708         if (!trans)
6709                 goto err_trans;
6710
6711         newobj = nft_obj_init(ctx, type, attr);
6712         if (IS_ERR(newobj)) {
6713                 err = PTR_ERR(newobj);
6714                 goto err_free_trans;
6715         }
6716
6717         nft_trans_obj(trans) = obj;
6718         nft_trans_obj_update(trans) = true;
6719         nft_trans_obj_newobj(trans) = newobj;
6720         nft_trans_commit_list_add_tail(ctx->net, trans);
6721
6722         return 0;
6723
6724 err_free_trans:
6725         kfree(trans);
6726 err_trans:
6727         module_put(type->owner);
6728         return err;
6729 }
6730
6731 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
6732                             const struct nlattr * const nla[])
6733 {
6734         struct netlink_ext_ack *extack = info->extack;
6735         u8 genmask = nft_genmask_next(info->net);
6736         u8 family = info->nfmsg->nfgen_family;
6737         const struct nft_object_type *type;
6738         struct net *net = info->net;
6739         struct nft_table *table;
6740         struct nft_object *obj;
6741         struct nft_ctx ctx;
6742         u32 objtype;
6743         int err;
6744
6745         if (!nla[NFTA_OBJ_TYPE] ||
6746             !nla[NFTA_OBJ_NAME] ||
6747             !nla[NFTA_OBJ_DATA])
6748                 return -EINVAL;
6749
6750         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6751                                  NETLINK_CB(skb).portid);
6752         if (IS_ERR(table)) {
6753                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6754                 return PTR_ERR(table);
6755         }
6756
6757         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6758         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6759         if (IS_ERR(obj)) {
6760                 err = PTR_ERR(obj);
6761                 if (err != -ENOENT) {
6762                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6763                         return err;
6764                 }
6765         } else {
6766                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
6767                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6768                         return -EEXIST;
6769                 }
6770                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
6771                         return -EOPNOTSUPP;
6772
6773                 type = __nft_obj_type_get(objtype);
6774                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6775
6776                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6777         }
6778
6779         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6780
6781         type = nft_obj_type_get(net, objtype);
6782         if (IS_ERR(type))
6783                 return PTR_ERR(type);
6784
6785         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6786         if (IS_ERR(obj)) {
6787                 err = PTR_ERR(obj);
6788                 goto err_init;
6789         }
6790         obj->key.table = table;
6791         obj->handle = nf_tables_alloc_handle(table);
6792
6793         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
6794         if (!obj->key.name) {
6795                 err = -ENOMEM;
6796                 goto err_strdup;
6797         }
6798
6799         if (nla[NFTA_OBJ_USERDATA]) {
6800                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6801                 if (obj->udata == NULL)
6802                         goto err_userdata;
6803
6804                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6805         }
6806
6807         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6808         if (err < 0)
6809                 goto err_trans;
6810
6811         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6812                               nft_objname_ht_params);
6813         if (err < 0)
6814                 goto err_obj_ht;
6815
6816         list_add_tail_rcu(&obj->list, &table->objects);
6817         table->use++;
6818         return 0;
6819 err_obj_ht:
6820         /* queued in transaction log */
6821         INIT_LIST_HEAD(&obj->list);
6822         return err;
6823 err_trans:
6824         kfree(obj->udata);
6825 err_userdata:
6826         kfree(obj->key.name);
6827 err_strdup:
6828         if (obj->ops->destroy)
6829                 obj->ops->destroy(&ctx, obj);
6830         kfree(obj);
6831 err_init:
6832         module_put(type->owner);
6833         return err;
6834 }
6835
6836 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6837                                    u32 portid, u32 seq, int event, u32 flags,
6838                                    int family, const struct nft_table *table,
6839                                    struct nft_object *obj, bool reset)
6840 {
6841         struct nlmsghdr *nlh;
6842
6843         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6844         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
6845                            NFNETLINK_V0, nft_base_seq(net));
6846         if (!nlh)
6847                 goto nla_put_failure;
6848
6849         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6850             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6851             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6852             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6853             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6854             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6855                          NFTA_OBJ_PAD))
6856                 goto nla_put_failure;
6857
6858         if (obj->udata &&
6859             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6860                 goto nla_put_failure;
6861
6862         nlmsg_end(skb, nlh);
6863         return 0;
6864
6865 nla_put_failure:
6866         nlmsg_trim(skb, nlh);
6867         return -1;
6868 }
6869
6870 struct nft_obj_filter {
6871         char            *table;
6872         u32             type;
6873 };
6874
6875 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6876 {
6877         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6878         const struct nft_table *table;
6879         unsigned int idx = 0, s_idx = cb->args[0];
6880         struct nft_obj_filter *filter = cb->data;
6881         struct net *net = sock_net(skb->sk);
6882         int family = nfmsg->nfgen_family;
6883         struct nftables_pernet *nft_net;
6884         struct nft_object *obj;
6885         bool reset = false;
6886
6887         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6888                 reset = true;
6889
6890         rcu_read_lock();
6891         nft_net = nft_pernet(net);
6892         cb->seq = nft_net->base_seq;
6893
6894         list_for_each_entry_rcu(table, &nft_net->tables, list) {
6895                 if (family != NFPROTO_UNSPEC && family != table->family)
6896                         continue;
6897
6898                 list_for_each_entry_rcu(obj, &table->objects, list) {
6899                         if (!nft_is_active(net, obj))
6900                                 goto cont;
6901                         if (idx < s_idx)
6902                                 goto cont;
6903                         if (idx > s_idx)
6904                                 memset(&cb->args[1], 0,
6905                                        sizeof(cb->args) - sizeof(cb->args[0]));
6906                         if (filter && filter->table &&
6907                             strcmp(filter->table, table->name))
6908                                 goto cont;
6909                         if (filter &&
6910                             filter->type != NFT_OBJECT_UNSPEC &&
6911                             obj->ops->type->type != filter->type)
6912                                 goto cont;
6913                         if (reset) {
6914                                 char *buf = kasprintf(GFP_ATOMIC,
6915                                                       "%s:%u",
6916                                                       table->name,
6917                                                       nft_net->base_seq);
6918
6919                                 audit_log_nfcfg(buf,
6920                                                 family,
6921                                                 obj->handle,
6922                                                 AUDIT_NFT_OP_OBJ_RESET,
6923                                                 GFP_ATOMIC);
6924                                 kfree(buf);
6925                         }
6926
6927                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6928                                                     cb->nlh->nlmsg_seq,
6929                                                     NFT_MSG_NEWOBJ,
6930                                                     NLM_F_MULTI | NLM_F_APPEND,
6931                                                     table->family, table,
6932                                                     obj, reset) < 0)
6933                                 goto done;
6934
6935                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6936 cont:
6937                         idx++;
6938                 }
6939         }
6940 done:
6941         rcu_read_unlock();
6942
6943         cb->args[0] = idx;
6944         return skb->len;
6945 }
6946
6947 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6948 {
6949         const struct nlattr * const *nla = cb->data;
6950         struct nft_obj_filter *filter = NULL;
6951
6952         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6953                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6954                 if (!filter)
6955                         return -ENOMEM;
6956
6957                 if (nla[NFTA_OBJ_TABLE]) {
6958                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6959                         if (!filter->table) {
6960                                 kfree(filter);
6961                                 return -ENOMEM;
6962                         }
6963                 }
6964
6965                 if (nla[NFTA_OBJ_TYPE])
6966                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6967         }
6968
6969         cb->data = filter;
6970         return 0;
6971 }
6972
6973 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6974 {
6975         struct nft_obj_filter *filter = cb->data;
6976
6977         if (filter) {
6978                 kfree(filter->table);
6979                 kfree(filter);
6980         }
6981
6982         return 0;
6983 }
6984
6985 /* called with rcu_read_lock held */
6986 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
6987                             const struct nlattr * const nla[])
6988 {
6989         struct netlink_ext_ack *extack = info->extack;
6990         u8 genmask = nft_genmask_cur(info->net);
6991         u8 family = info->nfmsg->nfgen_family;
6992         const struct nft_table *table;
6993         struct net *net = info->net;
6994         struct nft_object *obj;
6995         struct sk_buff *skb2;
6996         bool reset = false;
6997         u32 objtype;
6998         int err;
6999
7000         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7001                 struct netlink_dump_control c = {
7002                         .start = nf_tables_dump_obj_start,
7003                         .dump = nf_tables_dump_obj,
7004                         .done = nf_tables_dump_obj_done,
7005                         .module = THIS_MODULE,
7006                         .data = (void *)nla,
7007                 };
7008
7009                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7010         }
7011
7012         if (!nla[NFTA_OBJ_NAME] ||
7013             !nla[NFTA_OBJ_TYPE])
7014                 return -EINVAL;
7015
7016         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7017         if (IS_ERR(table)) {
7018                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7019                 return PTR_ERR(table);
7020         }
7021
7022         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7023         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7024         if (IS_ERR(obj)) {
7025                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7026                 return PTR_ERR(obj);
7027         }
7028
7029         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7030         if (!skb2)
7031                 return -ENOMEM;
7032
7033         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7034                 reset = true;
7035
7036         if (reset) {
7037                 const struct nftables_pernet *nft_net;
7038                 char *buf;
7039
7040                 nft_net = nft_pernet(net);
7041                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7042
7043                 audit_log_nfcfg(buf,
7044                                 family,
7045                                 obj->handle,
7046                                 AUDIT_NFT_OP_OBJ_RESET,
7047                                 GFP_ATOMIC);
7048                 kfree(buf);
7049         }
7050
7051         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7052                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7053                                       family, table, obj, reset);
7054         if (err < 0)
7055                 goto err_fill_obj_info;
7056
7057         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7058
7059 err_fill_obj_info:
7060         kfree_skb(skb2);
7061         return err;
7062 }
7063
7064 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7065 {
7066         if (obj->ops->destroy)
7067                 obj->ops->destroy(ctx, obj);
7068
7069         module_put(obj->ops->type->owner);
7070         kfree(obj->key.name);
7071         kfree(obj->udata);
7072         kfree(obj);
7073 }
7074
7075 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7076                             const struct nlattr * const nla[])
7077 {
7078         struct netlink_ext_ack *extack = info->extack;
7079         u8 genmask = nft_genmask_next(info->net);
7080         u8 family = info->nfmsg->nfgen_family;
7081         struct net *net = info->net;
7082         const struct nlattr *attr;
7083         struct nft_table *table;
7084         struct nft_object *obj;
7085         struct nft_ctx ctx;
7086         u32 objtype;
7087
7088         if (!nla[NFTA_OBJ_TYPE] ||
7089             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7090                 return -EINVAL;
7091
7092         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7093                                  NETLINK_CB(skb).portid);
7094         if (IS_ERR(table)) {
7095                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7096                 return PTR_ERR(table);
7097         }
7098
7099         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7100         if (nla[NFTA_OBJ_HANDLE]) {
7101                 attr = nla[NFTA_OBJ_HANDLE];
7102                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7103         } else {
7104                 attr = nla[NFTA_OBJ_NAME];
7105                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7106         }
7107
7108         if (IS_ERR(obj)) {
7109                 NL_SET_BAD_ATTR(extack, attr);
7110                 return PTR_ERR(obj);
7111         }
7112         if (obj->use > 0) {
7113                 NL_SET_BAD_ATTR(extack, attr);
7114                 return -EBUSY;
7115         }
7116
7117         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7118
7119         return nft_delobj(&ctx, obj);
7120 }
7121
7122 void nft_obj_notify(struct net *net, const struct nft_table *table,
7123                     struct nft_object *obj, u32 portid, u32 seq, int event,
7124                     u16 flags, int family, int report, gfp_t gfp)
7125 {
7126         struct nftables_pernet *nft_net = nft_pernet(net);
7127         struct sk_buff *skb;
7128         int err;
7129         char *buf = kasprintf(gfp, "%s:%u",
7130                               table->name, nft_net->base_seq);
7131
7132         audit_log_nfcfg(buf,
7133                         family,
7134                         obj->handle,
7135                         event == NFT_MSG_NEWOBJ ?
7136                                  AUDIT_NFT_OP_OBJ_REGISTER :
7137                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7138                         gfp);
7139         kfree(buf);
7140
7141         if (!report &&
7142             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7143                 return;
7144
7145         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7146         if (skb == NULL)
7147                 goto err;
7148
7149         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7150                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7151                                       family, table, obj, false);
7152         if (err < 0) {
7153                 kfree_skb(skb);
7154                 goto err;
7155         }
7156
7157         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7158         return;
7159 err:
7160         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7161 }
7162 EXPORT_SYMBOL_GPL(nft_obj_notify);
7163
7164 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7165                                  struct nft_object *obj, int event)
7166 {
7167         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7168                        ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7169 }
7170
7171 /*
7172  * Flow tables
7173  */
7174 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7175 {
7176         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7177         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7178         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7179 }
7180 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7181
7182 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7183 {
7184         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7185         list_del_rcu(&type->list);
7186         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7187 }
7188 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7189
7190 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7191         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7192                                             .len = NFT_NAME_MAXLEN - 1 },
7193         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7194                                             .len = NFT_NAME_MAXLEN - 1 },
7195         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7196         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7197         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7198 };
7199
7200 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7201                                            const struct nlattr *nla, u8 genmask)
7202 {
7203         struct nft_flowtable *flowtable;
7204
7205         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7206                 if (!nla_strcmp(nla, flowtable->name) &&
7207                     nft_active_genmask(flowtable, genmask))
7208                         return flowtable;
7209         }
7210         return ERR_PTR(-ENOENT);
7211 }
7212 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7213
7214 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7215                                     struct nft_flowtable *flowtable,
7216                                     enum nft_trans_phase phase)
7217 {
7218         switch (phase) {
7219         case NFT_TRANS_PREPARE:
7220         case NFT_TRANS_ABORT:
7221         case NFT_TRANS_RELEASE:
7222                 flowtable->use--;
7223                 fallthrough;
7224         default:
7225                 return;
7226         }
7227 }
7228 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7229
7230 static struct nft_flowtable *
7231 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7232                               const struct nlattr *nla, u8 genmask)
7233 {
7234        struct nft_flowtable *flowtable;
7235
7236        list_for_each_entry(flowtable, &table->flowtables, list) {
7237                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7238                    nft_active_genmask(flowtable, genmask))
7239                        return flowtable;
7240        }
7241        return ERR_PTR(-ENOENT);
7242 }
7243
7244 struct nft_flowtable_hook {
7245         u32                     num;
7246         int                     priority;
7247         struct list_head        list;
7248 };
7249
7250 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7251         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
7252         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
7253         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
7254 };
7255
7256 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7257                                     const struct nlattr *attr,
7258                                     struct nft_flowtable_hook *flowtable_hook,
7259                                     struct nft_flowtable *flowtable, bool add)
7260 {
7261         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7262         struct nft_hook *hook;
7263         int hooknum, priority;
7264         int err;
7265
7266         INIT_LIST_HEAD(&flowtable_hook->list);
7267
7268         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7269                                           nft_flowtable_hook_policy, NULL);
7270         if (err < 0)
7271                 return err;
7272
7273         if (add) {
7274                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7275                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7276                         return -EINVAL;
7277
7278                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7279                 if (hooknum != NF_NETDEV_INGRESS)
7280                         return -EOPNOTSUPP;
7281
7282                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7283
7284                 flowtable_hook->priority        = priority;
7285                 flowtable_hook->num             = hooknum;
7286         } else {
7287                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7288                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7289                         if (hooknum != flowtable->hooknum)
7290                                 return -EOPNOTSUPP;
7291                 }
7292
7293                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7294                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7295                         if (priority != flowtable->data.priority)
7296                                 return -EOPNOTSUPP;
7297                 }
7298
7299                 flowtable_hook->priority        = flowtable->data.priority;
7300                 flowtable_hook->num             = flowtable->hooknum;
7301         }
7302
7303         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7304                 err = nf_tables_parse_netdev_hooks(ctx->net,
7305                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
7306                                                    &flowtable_hook->list);
7307                 if (err < 0)
7308                         return err;
7309         }
7310
7311         list_for_each_entry(hook, &flowtable_hook->list, list) {
7312                 hook->ops.pf            = NFPROTO_NETDEV;
7313                 hook->ops.hooknum       = flowtable_hook->num;
7314                 hook->ops.priority      = flowtable_hook->priority;
7315                 hook->ops.priv          = &flowtable->data;
7316                 hook->ops.hook          = flowtable->data.type->hook;
7317         }
7318
7319         return err;
7320 }
7321
7322 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7323 {
7324         const struct nf_flowtable_type *type;
7325
7326         list_for_each_entry(type, &nf_tables_flowtables, list) {
7327                 if (family == type->family)
7328                         return type;
7329         }
7330         return NULL;
7331 }
7332
7333 static const struct nf_flowtable_type *
7334 nft_flowtable_type_get(struct net *net, u8 family)
7335 {
7336         const struct nf_flowtable_type *type;
7337
7338         type = __nft_flowtable_type_get(family);
7339         if (type != NULL && try_module_get(type->owner))
7340                 return type;
7341
7342         lockdep_nfnl_nft_mutex_not_held();
7343 #ifdef CONFIG_MODULES
7344         if (type == NULL) {
7345                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7346                         return ERR_PTR(-EAGAIN);
7347         }
7348 #endif
7349         return ERR_PTR(-ENOENT);
7350 }
7351
7352 /* Only called from error and netdev event paths. */
7353 static void nft_unregister_flowtable_hook(struct net *net,
7354                                           struct nft_flowtable *flowtable,
7355                                           struct nft_hook *hook)
7356 {
7357         nf_unregister_net_hook(net, &hook->ops);
7358         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7359                                     FLOW_BLOCK_UNBIND);
7360 }
7361
7362 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7363                                                  struct list_head *hook_list,
7364                                                  bool release_netdev)
7365 {
7366         struct nft_hook *hook, *next;
7367
7368         list_for_each_entry_safe(hook, next, hook_list, list) {
7369                 nf_unregister_net_hook(net, &hook->ops);
7370                 if (release_netdev) {
7371                         list_del(&hook->list);
7372                         kfree_rcu(hook, rcu);
7373                 }
7374         }
7375 }
7376
7377 static void nft_unregister_flowtable_net_hooks(struct net *net,
7378                                                struct list_head *hook_list)
7379 {
7380         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7381 }
7382
7383 static int nft_register_flowtable_net_hooks(struct net *net,
7384                                             struct nft_table *table,
7385                                             struct list_head *hook_list,
7386                                             struct nft_flowtable *flowtable)
7387 {
7388         struct nft_hook *hook, *hook2, *next;
7389         struct nft_flowtable *ft;
7390         int err, i = 0;
7391
7392         list_for_each_entry(hook, hook_list, list) {
7393                 list_for_each_entry(ft, &table->flowtables, list) {
7394                         if (!nft_is_active_next(net, ft))
7395                                 continue;
7396
7397                         list_for_each_entry(hook2, &ft->hook_list, list) {
7398                                 if (hook->ops.dev == hook2->ops.dev &&
7399                                     hook->ops.pf == hook2->ops.pf) {
7400                                         err = -EEXIST;
7401                                         goto err_unregister_net_hooks;
7402                                 }
7403                         }
7404                 }
7405
7406                 err = flowtable->data.type->setup(&flowtable->data,
7407                                                   hook->ops.dev,
7408                                                   FLOW_BLOCK_BIND);
7409                 if (err < 0)
7410                         goto err_unregister_net_hooks;
7411
7412                 err = nf_register_net_hook(net, &hook->ops);
7413                 if (err < 0) {
7414                         flowtable->data.type->setup(&flowtable->data,
7415                                                     hook->ops.dev,
7416                                                     FLOW_BLOCK_UNBIND);
7417                         goto err_unregister_net_hooks;
7418                 }
7419
7420                 i++;
7421         }
7422
7423         return 0;
7424
7425 err_unregister_net_hooks:
7426         list_for_each_entry_safe(hook, next, hook_list, list) {
7427                 if (i-- <= 0)
7428                         break;
7429
7430                 nft_unregister_flowtable_hook(net, flowtable, hook);
7431                 list_del_rcu(&hook->list);
7432                 kfree_rcu(hook, rcu);
7433         }
7434
7435         return err;
7436 }
7437
7438 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7439 {
7440         struct nft_hook *hook, *next;
7441
7442         list_for_each_entry_safe(hook, next, hook_list, list) {
7443                 list_del_rcu(&hook->list);
7444                 kfree_rcu(hook, rcu);
7445         }
7446 }
7447
7448 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7449                                 struct nft_flowtable *flowtable)
7450 {
7451         const struct nlattr * const *nla = ctx->nla;
7452         struct nft_flowtable_hook flowtable_hook;
7453         struct nft_hook *hook, *next;
7454         struct nft_trans *trans;
7455         bool unregister = false;
7456         u32 flags;
7457         int err;
7458
7459         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7460                                        &flowtable_hook, flowtable, false);
7461         if (err < 0)
7462                 return err;
7463
7464         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7465                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7466                         list_del(&hook->list);
7467                         kfree(hook);
7468                 }
7469         }
7470
7471         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7472                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7473                 if (flags & ~NFT_FLOWTABLE_MASK) {
7474                         err = -EOPNOTSUPP;
7475                         goto err_flowtable_update_hook;
7476                 }
7477                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7478                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7479                         err = -EOPNOTSUPP;
7480                         goto err_flowtable_update_hook;
7481                 }
7482         } else {
7483                 flags = flowtable->data.flags;
7484         }
7485
7486         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7487                                                &flowtable_hook.list, flowtable);
7488         if (err < 0)
7489                 goto err_flowtable_update_hook;
7490
7491         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7492                                 sizeof(struct nft_trans_flowtable));
7493         if (!trans) {
7494                 unregister = true;
7495                 err = -ENOMEM;
7496                 goto err_flowtable_update_hook;
7497         }
7498
7499         nft_trans_flowtable_flags(trans) = flags;
7500         nft_trans_flowtable(trans) = flowtable;
7501         nft_trans_flowtable_update(trans) = true;
7502         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7503         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7504
7505         nft_trans_commit_list_add_tail(ctx->net, trans);
7506
7507         return 0;
7508
7509 err_flowtable_update_hook:
7510         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7511                 if (unregister)
7512                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7513                 list_del_rcu(&hook->list);
7514                 kfree_rcu(hook, rcu);
7515         }
7516
7517         return err;
7518
7519 }
7520
7521 static int nf_tables_newflowtable(struct sk_buff *skb,
7522                                   const struct nfnl_info *info,
7523                                   const struct nlattr * const nla[])
7524 {
7525         struct netlink_ext_ack *extack = info->extack;
7526         struct nft_flowtable_hook flowtable_hook;
7527         u8 genmask = nft_genmask_next(info->net);
7528         u8 family = info->nfmsg->nfgen_family;
7529         const struct nf_flowtable_type *type;
7530         struct nft_flowtable *flowtable;
7531         struct nft_hook *hook, *next;
7532         struct net *net = info->net;
7533         struct nft_table *table;
7534         struct nft_ctx ctx;
7535         int err;
7536
7537         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7538             !nla[NFTA_FLOWTABLE_NAME] ||
7539             !nla[NFTA_FLOWTABLE_HOOK])
7540                 return -EINVAL;
7541
7542         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7543                                  genmask, NETLINK_CB(skb).portid);
7544         if (IS_ERR(table)) {
7545                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7546                 return PTR_ERR(table);
7547         }
7548
7549         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7550                                          genmask);
7551         if (IS_ERR(flowtable)) {
7552                 err = PTR_ERR(flowtable);
7553                 if (err != -ENOENT) {
7554                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7555                         return err;
7556                 }
7557         } else {
7558                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7559                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7560                         return -EEXIST;
7561                 }
7562
7563                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7564
7565                 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7566         }
7567
7568         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7569
7570         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
7571         if (!flowtable)
7572                 return -ENOMEM;
7573
7574         flowtable->table = table;
7575         flowtable->handle = nf_tables_alloc_handle(table);
7576         INIT_LIST_HEAD(&flowtable->hook_list);
7577
7578         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
7579         if (!flowtable->name) {
7580                 err = -ENOMEM;
7581                 goto err1;
7582         }
7583
7584         type = nft_flowtable_type_get(net, family);
7585         if (IS_ERR(type)) {
7586                 err = PTR_ERR(type);
7587                 goto err2;
7588         }
7589
7590         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7591                 flowtable->data.flags =
7592                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7593                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7594                         err = -EOPNOTSUPP;
7595                         goto err3;
7596                 }
7597         }
7598
7599         write_pnet(&flowtable->data.net, net);
7600         flowtable->data.type = type;
7601         err = type->init(&flowtable->data);
7602         if (err < 0)
7603                 goto err3;
7604
7605         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7606                                        &flowtable_hook, flowtable, true);
7607         if (err < 0)
7608                 goto err4;
7609
7610         list_splice(&flowtable_hook.list, &flowtable->hook_list);
7611         flowtable->data.priority = flowtable_hook.priority;
7612         flowtable->hooknum = flowtable_hook.num;
7613
7614         err = nft_register_flowtable_net_hooks(ctx.net, table,
7615                                                &flowtable->hook_list,
7616                                                flowtable);
7617         if (err < 0) {
7618                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7619                 goto err4;
7620         }
7621
7622         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7623         if (err < 0)
7624                 goto err5;
7625
7626         list_add_tail_rcu(&flowtable->list, &table->flowtables);
7627         table->use++;
7628
7629         return 0;
7630 err5:
7631         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7632                 nft_unregister_flowtable_hook(net, flowtable, hook);
7633                 list_del_rcu(&hook->list);
7634                 kfree_rcu(hook, rcu);
7635         }
7636 err4:
7637         flowtable->data.type->free(&flowtable->data);
7638 err3:
7639         module_put(type->owner);
7640 err2:
7641         kfree(flowtable->name);
7642 err1:
7643         kfree(flowtable);
7644         return err;
7645 }
7646
7647 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7648 {
7649         struct nft_hook *this, *next;
7650
7651         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7652                 list_del(&this->list);
7653                 kfree(this);
7654         }
7655 }
7656
7657 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7658                                  struct nft_flowtable *flowtable)
7659 {
7660         const struct nlattr * const *nla = ctx->nla;
7661         struct nft_flowtable_hook flowtable_hook;
7662         LIST_HEAD(flowtable_del_list);
7663         struct nft_hook *this, *hook;
7664         struct nft_trans *trans;
7665         int err;
7666
7667         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7668                                        &flowtable_hook, flowtable, false);
7669         if (err < 0)
7670                 return err;
7671
7672         list_for_each_entry(this, &flowtable_hook.list, list) {
7673                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7674                 if (!hook) {
7675                         err = -ENOENT;
7676                         goto err_flowtable_del_hook;
7677                 }
7678                 list_move(&hook->list, &flowtable_del_list);
7679         }
7680
7681         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7682                                 sizeof(struct nft_trans_flowtable));
7683         if (!trans) {
7684                 err = -ENOMEM;
7685                 goto err_flowtable_del_hook;
7686         }
7687
7688         nft_trans_flowtable(trans) = flowtable;
7689         nft_trans_flowtable_update(trans) = true;
7690         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7691         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
7692         nft_flowtable_hook_release(&flowtable_hook);
7693
7694         nft_trans_commit_list_add_tail(ctx->net, trans);
7695
7696         return 0;
7697
7698 err_flowtable_del_hook:
7699         list_splice(&flowtable_del_list, &flowtable->hook_list);
7700         nft_flowtable_hook_release(&flowtable_hook);
7701
7702         return err;
7703 }
7704
7705 static int nf_tables_delflowtable(struct sk_buff *skb,
7706                                   const struct nfnl_info *info,
7707                                   const struct nlattr * const nla[])
7708 {
7709         struct netlink_ext_ack *extack = info->extack;
7710         u8 genmask = nft_genmask_next(info->net);
7711         u8 family = info->nfmsg->nfgen_family;
7712         struct nft_flowtable *flowtable;
7713         struct net *net = info->net;
7714         const struct nlattr *attr;
7715         struct nft_table *table;
7716         struct nft_ctx ctx;
7717
7718         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7719             (!nla[NFTA_FLOWTABLE_NAME] &&
7720              !nla[NFTA_FLOWTABLE_HANDLE]))
7721                 return -EINVAL;
7722
7723         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7724                                  genmask, NETLINK_CB(skb).portid);
7725         if (IS_ERR(table)) {
7726                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7727                 return PTR_ERR(table);
7728         }
7729
7730         if (nla[NFTA_FLOWTABLE_HANDLE]) {
7731                 attr = nla[NFTA_FLOWTABLE_HANDLE];
7732                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7733         } else {
7734                 attr = nla[NFTA_FLOWTABLE_NAME];
7735                 flowtable = nft_flowtable_lookup(table, attr, genmask);
7736         }
7737
7738         if (IS_ERR(flowtable)) {
7739                 NL_SET_BAD_ATTR(extack, attr);
7740                 return PTR_ERR(flowtable);
7741         }
7742
7743         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7744
7745         if (nla[NFTA_FLOWTABLE_HOOK])
7746                 return nft_delflowtable_hook(&ctx, flowtable);
7747
7748         if (flowtable->use > 0) {
7749                 NL_SET_BAD_ATTR(extack, attr);
7750                 return -EBUSY;
7751         }
7752
7753         return nft_delflowtable(&ctx, flowtable);
7754 }
7755
7756 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7757                                          u32 portid, u32 seq, int event,
7758                                          u32 flags, int family,
7759                                          struct nft_flowtable *flowtable,
7760                                          struct list_head *hook_list)
7761 {
7762         struct nlattr *nest, *nest_devs;
7763         struct nft_hook *hook;
7764         struct nlmsghdr *nlh;
7765
7766         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7767         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7768                            NFNETLINK_V0, nft_base_seq(net));
7769         if (!nlh)
7770                 goto nla_put_failure;
7771
7772         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7773             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7774             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7775             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7776                          NFTA_FLOWTABLE_PAD) ||
7777             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7778                 goto nla_put_failure;
7779
7780         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7781         if (!nest)
7782                 goto nla_put_failure;
7783         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7784             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7785                 goto nla_put_failure;
7786
7787         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7788         if (!nest_devs)
7789                 goto nla_put_failure;
7790
7791         list_for_each_entry_rcu(hook, hook_list, list) {
7792                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7793                         goto nla_put_failure;
7794         }
7795         nla_nest_end(skb, nest_devs);
7796         nla_nest_end(skb, nest);
7797
7798         nlmsg_end(skb, nlh);
7799         return 0;
7800
7801 nla_put_failure:
7802         nlmsg_trim(skb, nlh);
7803         return -1;
7804 }
7805
7806 struct nft_flowtable_filter {
7807         char            *table;
7808 };
7809
7810 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7811                                     struct netlink_callback *cb)
7812 {
7813         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7814         struct nft_flowtable_filter *filter = cb->data;
7815         unsigned int idx = 0, s_idx = cb->args[0];
7816         struct net *net = sock_net(skb->sk);
7817         int family = nfmsg->nfgen_family;
7818         struct nft_flowtable *flowtable;
7819         struct nftables_pernet *nft_net;
7820         const struct nft_table *table;
7821
7822         rcu_read_lock();
7823         nft_net = nft_pernet(net);
7824         cb->seq = nft_net->base_seq;
7825
7826         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7827                 if (family != NFPROTO_UNSPEC && family != table->family)
7828                         continue;
7829
7830                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7831                         if (!nft_is_active(net, flowtable))
7832                                 goto cont;
7833                         if (idx < s_idx)
7834                                 goto cont;
7835                         if (idx > s_idx)
7836                                 memset(&cb->args[1], 0,
7837                                        sizeof(cb->args) - sizeof(cb->args[0]));
7838                         if (filter && filter->table &&
7839                             strcmp(filter->table, table->name))
7840                                 goto cont;
7841
7842                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7843                                                           cb->nlh->nlmsg_seq,
7844                                                           NFT_MSG_NEWFLOWTABLE,
7845                                                           NLM_F_MULTI | NLM_F_APPEND,
7846                                                           table->family,
7847                                                           flowtable,
7848                                                           &flowtable->hook_list) < 0)
7849                                 goto done;
7850
7851                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7852 cont:
7853                         idx++;
7854                 }
7855         }
7856 done:
7857         rcu_read_unlock();
7858
7859         cb->args[0] = idx;
7860         return skb->len;
7861 }
7862
7863 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7864 {
7865         const struct nlattr * const *nla = cb->data;
7866         struct nft_flowtable_filter *filter = NULL;
7867
7868         if (nla[NFTA_FLOWTABLE_TABLE]) {
7869                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7870                 if (!filter)
7871                         return -ENOMEM;
7872
7873                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7874                                            GFP_ATOMIC);
7875                 if (!filter->table) {
7876                         kfree(filter);
7877                         return -ENOMEM;
7878                 }
7879         }
7880
7881         cb->data = filter;
7882         return 0;
7883 }
7884
7885 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7886 {
7887         struct nft_flowtable_filter *filter = cb->data;
7888
7889         if (!filter)
7890                 return 0;
7891
7892         kfree(filter->table);
7893         kfree(filter);
7894
7895         return 0;
7896 }
7897
7898 /* called with rcu_read_lock held */
7899 static int nf_tables_getflowtable(struct sk_buff *skb,
7900                                   const struct nfnl_info *info,
7901                                   const struct nlattr * const nla[])
7902 {
7903         u8 genmask = nft_genmask_cur(info->net);
7904         u8 family = info->nfmsg->nfgen_family;
7905         struct nft_flowtable *flowtable;
7906         const struct nft_table *table;
7907         struct net *net = info->net;
7908         struct sk_buff *skb2;
7909         int err;
7910
7911         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7912                 struct netlink_dump_control c = {
7913                         .start = nf_tables_dump_flowtable_start,
7914                         .dump = nf_tables_dump_flowtable,
7915                         .done = nf_tables_dump_flowtable_done,
7916                         .module = THIS_MODULE,
7917                         .data = (void *)nla,
7918                 };
7919
7920                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7921         }
7922
7923         if (!nla[NFTA_FLOWTABLE_NAME])
7924                 return -EINVAL;
7925
7926         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7927                                  genmask, 0);
7928         if (IS_ERR(table))
7929                 return PTR_ERR(table);
7930
7931         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7932                                          genmask);
7933         if (IS_ERR(flowtable))
7934                 return PTR_ERR(flowtable);
7935
7936         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7937         if (!skb2)
7938                 return -ENOMEM;
7939
7940         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7941                                             info->nlh->nlmsg_seq,
7942                                             NFT_MSG_NEWFLOWTABLE, 0, family,
7943                                             flowtable, &flowtable->hook_list);
7944         if (err < 0)
7945                 goto err_fill_flowtable_info;
7946
7947         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7948
7949 err_fill_flowtable_info:
7950         kfree_skb(skb2);
7951         return err;
7952 }
7953
7954 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7955                                        struct nft_flowtable *flowtable,
7956                                        struct list_head *hook_list,
7957                                        int event)
7958 {
7959         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
7960         struct sk_buff *skb;
7961         u16 flags = 0;
7962         int err;
7963
7964         if (!ctx->report &&
7965             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7966                 return;
7967
7968         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7969         if (skb == NULL)
7970                 goto err;
7971
7972         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
7973                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
7974
7975         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7976                                             ctx->seq, event, flags,
7977                                             ctx->family, flowtable, hook_list);
7978         if (err < 0) {
7979                 kfree_skb(skb);
7980                 goto err;
7981         }
7982
7983         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
7984         return;
7985 err:
7986         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7987 }
7988
7989 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7990 {
7991         struct nft_hook *hook, *next;
7992
7993         flowtable->data.type->free(&flowtable->data);
7994         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7995                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7996                                             FLOW_BLOCK_UNBIND);
7997                 list_del_rcu(&hook->list);
7998                 kfree(hook);
7999         }
8000         kfree(flowtable->name);
8001         module_put(flowtable->data.type->owner);
8002         kfree(flowtable);
8003 }
8004
8005 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8006                                    u32 portid, u32 seq)
8007 {
8008         struct nftables_pernet *nft_net = nft_pernet(net);
8009         struct nlmsghdr *nlh;
8010         char buf[TASK_COMM_LEN];
8011         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8012
8013         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8014                            NFNETLINK_V0, nft_base_seq(net));
8015         if (!nlh)
8016                 goto nla_put_failure;
8017
8018         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8019             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8020             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8021                 goto nla_put_failure;
8022
8023         nlmsg_end(skb, nlh);
8024         return 0;
8025
8026 nla_put_failure:
8027         nlmsg_trim(skb, nlh);
8028         return -EMSGSIZE;
8029 }
8030
8031 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8032                                 struct nft_flowtable *flowtable)
8033 {
8034         struct nft_hook *hook;
8035
8036         list_for_each_entry(hook, &flowtable->hook_list, list) {
8037                 if (hook->ops.dev != dev)
8038                         continue;
8039
8040                 /* flow_offload_netdev_event() cleans up entries for us. */
8041                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8042                 list_del_rcu(&hook->list);
8043                 kfree_rcu(hook, rcu);
8044                 break;
8045         }
8046 }
8047
8048 static int nf_tables_flowtable_event(struct notifier_block *this,
8049                                      unsigned long event, void *ptr)
8050 {
8051         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8052         struct nft_flowtable *flowtable;
8053         struct nftables_pernet *nft_net;
8054         struct nft_table *table;
8055         struct net *net;
8056
8057         if (event != NETDEV_UNREGISTER)
8058                 return 0;
8059
8060         net = dev_net(dev);
8061         nft_net = nft_pernet(net);
8062         mutex_lock(&nft_net->commit_mutex);
8063         list_for_each_entry(table, &nft_net->tables, list) {
8064                 list_for_each_entry(flowtable, &table->flowtables, list) {
8065                         nft_flowtable_event(event, dev, flowtable);
8066                 }
8067         }
8068         mutex_unlock(&nft_net->commit_mutex);
8069
8070         return NOTIFY_DONE;
8071 }
8072
8073 static struct notifier_block nf_tables_flowtable_notifier = {
8074         .notifier_call  = nf_tables_flowtable_event,
8075 };
8076
8077 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8078                                  int event)
8079 {
8080         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8081         struct sk_buff *skb2;
8082         int err;
8083
8084         if (!nlmsg_report(nlh) &&
8085             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8086                 return;
8087
8088         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8089         if (skb2 == NULL)
8090                 goto err;
8091
8092         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8093                                       nlh->nlmsg_seq);
8094         if (err < 0) {
8095                 kfree_skb(skb2);
8096                 goto err;
8097         }
8098
8099         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8100                        nlmsg_report(nlh), GFP_KERNEL);
8101         return;
8102 err:
8103         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8104                           -ENOBUFS);
8105 }
8106
8107 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8108                             const struct nlattr * const nla[])
8109 {
8110         struct sk_buff *skb2;
8111         int err;
8112
8113         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8114         if (skb2 == NULL)
8115                 return -ENOMEM;
8116
8117         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8118                                       info->nlh->nlmsg_seq);
8119         if (err < 0)
8120                 goto err_fill_gen_info;
8121
8122         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8123
8124 err_fill_gen_info:
8125         kfree_skb(skb2);
8126         return err;
8127 }
8128
8129 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8130         [NFT_MSG_NEWTABLE] = {
8131                 .call           = nf_tables_newtable,
8132                 .type           = NFNL_CB_BATCH,
8133                 .attr_count     = NFTA_TABLE_MAX,
8134                 .policy         = nft_table_policy,
8135         },
8136         [NFT_MSG_GETTABLE] = {
8137                 .call           = nf_tables_gettable,
8138                 .type           = NFNL_CB_RCU,
8139                 .attr_count     = NFTA_TABLE_MAX,
8140                 .policy         = nft_table_policy,
8141         },
8142         [NFT_MSG_DELTABLE] = {
8143                 .call           = nf_tables_deltable,
8144                 .type           = NFNL_CB_BATCH,
8145                 .attr_count     = NFTA_TABLE_MAX,
8146                 .policy         = nft_table_policy,
8147         },
8148         [NFT_MSG_NEWCHAIN] = {
8149                 .call           = nf_tables_newchain,
8150                 .type           = NFNL_CB_BATCH,
8151                 .attr_count     = NFTA_CHAIN_MAX,
8152                 .policy         = nft_chain_policy,
8153         },
8154         [NFT_MSG_GETCHAIN] = {
8155                 .call           = nf_tables_getchain,
8156                 .type           = NFNL_CB_RCU,
8157                 .attr_count     = NFTA_CHAIN_MAX,
8158                 .policy         = nft_chain_policy,
8159         },
8160         [NFT_MSG_DELCHAIN] = {
8161                 .call           = nf_tables_delchain,
8162                 .type           = NFNL_CB_BATCH,
8163                 .attr_count     = NFTA_CHAIN_MAX,
8164                 .policy         = nft_chain_policy,
8165         },
8166         [NFT_MSG_NEWRULE] = {
8167                 .call           = nf_tables_newrule,
8168                 .type           = NFNL_CB_BATCH,
8169                 .attr_count     = NFTA_RULE_MAX,
8170                 .policy         = nft_rule_policy,
8171         },
8172         [NFT_MSG_GETRULE] = {
8173                 .call           = nf_tables_getrule,
8174                 .type           = NFNL_CB_RCU,
8175                 .attr_count     = NFTA_RULE_MAX,
8176                 .policy         = nft_rule_policy,
8177         },
8178         [NFT_MSG_DELRULE] = {
8179                 .call           = nf_tables_delrule,
8180                 .type           = NFNL_CB_BATCH,
8181                 .attr_count     = NFTA_RULE_MAX,
8182                 .policy         = nft_rule_policy,
8183         },
8184         [NFT_MSG_NEWSET] = {
8185                 .call           = nf_tables_newset,
8186                 .type           = NFNL_CB_BATCH,
8187                 .attr_count     = NFTA_SET_MAX,
8188                 .policy         = nft_set_policy,
8189         },
8190         [NFT_MSG_GETSET] = {
8191                 .call           = nf_tables_getset,
8192                 .type           = NFNL_CB_RCU,
8193                 .attr_count     = NFTA_SET_MAX,
8194                 .policy         = nft_set_policy,
8195         },
8196         [NFT_MSG_DELSET] = {
8197                 .call           = nf_tables_delset,
8198                 .type           = NFNL_CB_BATCH,
8199                 .attr_count     = NFTA_SET_MAX,
8200                 .policy         = nft_set_policy,
8201         },
8202         [NFT_MSG_NEWSETELEM] = {
8203                 .call           = nf_tables_newsetelem,
8204                 .type           = NFNL_CB_BATCH,
8205                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8206                 .policy         = nft_set_elem_list_policy,
8207         },
8208         [NFT_MSG_GETSETELEM] = {
8209                 .call           = nf_tables_getsetelem,
8210                 .type           = NFNL_CB_RCU,
8211                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8212                 .policy         = nft_set_elem_list_policy,
8213         },
8214         [NFT_MSG_DELSETELEM] = {
8215                 .call           = nf_tables_delsetelem,
8216                 .type           = NFNL_CB_BATCH,
8217                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8218                 .policy         = nft_set_elem_list_policy,
8219         },
8220         [NFT_MSG_GETGEN] = {
8221                 .call           = nf_tables_getgen,
8222                 .type           = NFNL_CB_RCU,
8223         },
8224         [NFT_MSG_NEWOBJ] = {
8225                 .call           = nf_tables_newobj,
8226                 .type           = NFNL_CB_BATCH,
8227                 .attr_count     = NFTA_OBJ_MAX,
8228                 .policy         = nft_obj_policy,
8229         },
8230         [NFT_MSG_GETOBJ] = {
8231                 .call           = nf_tables_getobj,
8232                 .type           = NFNL_CB_RCU,
8233                 .attr_count     = NFTA_OBJ_MAX,
8234                 .policy         = nft_obj_policy,
8235         },
8236         [NFT_MSG_DELOBJ] = {
8237                 .call           = nf_tables_delobj,
8238                 .type           = NFNL_CB_BATCH,
8239                 .attr_count     = NFTA_OBJ_MAX,
8240                 .policy         = nft_obj_policy,
8241         },
8242         [NFT_MSG_GETOBJ_RESET] = {
8243                 .call           = nf_tables_getobj,
8244                 .type           = NFNL_CB_RCU,
8245                 .attr_count     = NFTA_OBJ_MAX,
8246                 .policy         = nft_obj_policy,
8247         },
8248         [NFT_MSG_NEWFLOWTABLE] = {
8249                 .call           = nf_tables_newflowtable,
8250                 .type           = NFNL_CB_BATCH,
8251                 .attr_count     = NFTA_FLOWTABLE_MAX,
8252                 .policy         = nft_flowtable_policy,
8253         },
8254         [NFT_MSG_GETFLOWTABLE] = {
8255                 .call           = nf_tables_getflowtable,
8256                 .type           = NFNL_CB_RCU,
8257                 .attr_count     = NFTA_FLOWTABLE_MAX,
8258                 .policy         = nft_flowtable_policy,
8259         },
8260         [NFT_MSG_DELFLOWTABLE] = {
8261                 .call           = nf_tables_delflowtable,
8262                 .type           = NFNL_CB_BATCH,
8263                 .attr_count     = NFTA_FLOWTABLE_MAX,
8264                 .policy         = nft_flowtable_policy,
8265         },
8266 };
8267
8268 static int nf_tables_validate(struct net *net)
8269 {
8270         struct nftables_pernet *nft_net = nft_pernet(net);
8271         struct nft_table *table;
8272
8273         switch (nft_net->validate_state) {
8274         case NFT_VALIDATE_SKIP:
8275                 break;
8276         case NFT_VALIDATE_NEED:
8277                 nft_validate_state_update(net, NFT_VALIDATE_DO);
8278                 fallthrough;
8279         case NFT_VALIDATE_DO:
8280                 list_for_each_entry(table, &nft_net->tables, list) {
8281                         if (nft_table_validate(net, table) < 0)
8282                                 return -EAGAIN;
8283                 }
8284                 break;
8285         }
8286
8287         return 0;
8288 }
8289
8290 /* a drop policy has to be deferred until all rules have been activated,
8291  * otherwise a large ruleset that contains a drop-policy base chain will
8292  * cause all packets to get dropped until the full transaction has been
8293  * processed.
8294  *
8295  * We defer the drop policy until the transaction has been finalized.
8296  */
8297 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8298 {
8299         struct nft_base_chain *basechain;
8300
8301         if (nft_trans_chain_policy(trans) != NF_DROP)
8302                 return;
8303
8304         if (!nft_is_base_chain(trans->ctx.chain))
8305                 return;
8306
8307         basechain = nft_base_chain(trans->ctx.chain);
8308         basechain->policy = NF_DROP;
8309 }
8310
8311 static void nft_chain_commit_update(struct nft_trans *trans)
8312 {
8313         struct nft_base_chain *basechain;
8314
8315         if (nft_trans_chain_name(trans)) {
8316                 rhltable_remove(&trans->ctx.table->chains_ht,
8317                                 &trans->ctx.chain->rhlhead,
8318                                 nft_chain_ht_params);
8319                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8320                 rhltable_insert_key(&trans->ctx.table->chains_ht,
8321                                     trans->ctx.chain->name,
8322                                     &trans->ctx.chain->rhlhead,
8323                                     nft_chain_ht_params);
8324         }
8325
8326         if (!nft_is_base_chain(trans->ctx.chain))
8327                 return;
8328
8329         nft_chain_stats_replace(trans);
8330
8331         basechain = nft_base_chain(trans->ctx.chain);
8332
8333         switch (nft_trans_chain_policy(trans)) {
8334         case NF_DROP:
8335         case NF_ACCEPT:
8336                 basechain->policy = nft_trans_chain_policy(trans);
8337                 break;
8338         }
8339 }
8340
8341 static void nft_obj_commit_update(struct nft_trans *trans)
8342 {
8343         struct nft_object *newobj;
8344         struct nft_object *obj;
8345
8346         obj = nft_trans_obj(trans);
8347         newobj = nft_trans_obj_newobj(trans);
8348
8349         if (obj->ops->update)
8350                 obj->ops->update(obj, newobj);
8351
8352         nft_obj_destroy(&trans->ctx, newobj);
8353 }
8354
8355 static void nft_commit_release(struct nft_trans *trans)
8356 {
8357         switch (trans->msg_type) {
8358         case NFT_MSG_DELTABLE:
8359                 nf_tables_table_destroy(&trans->ctx);
8360                 break;
8361         case NFT_MSG_NEWCHAIN:
8362                 free_percpu(nft_trans_chain_stats(trans));
8363                 kfree(nft_trans_chain_name(trans));
8364                 break;
8365         case NFT_MSG_DELCHAIN:
8366                 nf_tables_chain_destroy(&trans->ctx);
8367                 break;
8368         case NFT_MSG_DELRULE:
8369                 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8370                         nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8371
8372                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8373                 break;
8374         case NFT_MSG_DELSET:
8375                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8376                 break;
8377         case NFT_MSG_DELSETELEM:
8378                 nf_tables_set_elem_destroy(&trans->ctx,
8379                                            nft_trans_elem_set(trans),
8380                                            nft_trans_elem(trans).priv);
8381                 break;
8382         case NFT_MSG_DELOBJ:
8383                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8384                 break;
8385         case NFT_MSG_DELFLOWTABLE:
8386                 if (nft_trans_flowtable_update(trans))
8387                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8388                 else
8389                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8390                 break;
8391         }
8392
8393         if (trans->put_net)
8394                 put_net(trans->ctx.net);
8395
8396         kfree(trans);
8397 }
8398
8399 static void nf_tables_trans_destroy_work(struct work_struct *w)
8400 {
8401         struct nft_trans *trans, *next;
8402         LIST_HEAD(head);
8403
8404         spin_lock(&nf_tables_destroy_list_lock);
8405         list_splice_init(&nf_tables_destroy_list, &head);
8406         spin_unlock(&nf_tables_destroy_list_lock);
8407
8408         if (list_empty(&head))
8409                 return;
8410
8411         synchronize_rcu();
8412
8413         list_for_each_entry_safe(trans, next, &head, list) {
8414                 list_del(&trans->list);
8415                 nft_commit_release(trans);
8416         }
8417 }
8418
8419 void nf_tables_trans_destroy_flush_work(void)
8420 {
8421         flush_work(&trans_destroy_work);
8422 }
8423 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8424
8425 static bool nft_expr_reduce(struct nft_regs_track *track,
8426                             const struct nft_expr *expr)
8427 {
8428         return false;
8429 }
8430
8431 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8432 {
8433         const struct nft_expr *expr, *last;
8434         struct nft_regs_track track = {};
8435         unsigned int size, data_size;
8436         void *data, *data_boundary;
8437         struct nft_rule_dp *prule;
8438         struct nft_rule *rule;
8439
8440         /* already handled or inactive chain? */
8441         if (chain->blob_next || !nft_is_active_next(net, chain))
8442                 return 0;
8443
8444         data_size = 0;
8445         list_for_each_entry(rule, &chain->rules, list) {
8446                 if (nft_is_active_next(net, rule)) {
8447                         data_size += sizeof(*prule) + rule->dlen;
8448                         if (data_size > INT_MAX)
8449                                 return -ENOMEM;
8450                 }
8451         }
8452         data_size += offsetof(struct nft_rule_dp, data);        /* last rule */
8453
8454         chain->blob_next = nf_tables_chain_alloc_rules(data_size);
8455         if (!chain->blob_next)
8456                 return -ENOMEM;
8457
8458         data = (void *)chain->blob_next->data;
8459         data_boundary = data + data_size;
8460         size = 0;
8461
8462         list_for_each_entry(rule, &chain->rules, list) {
8463                 if (!nft_is_active_next(net, rule))
8464                         continue;
8465
8466                 prule = (struct nft_rule_dp *)data;
8467                 data += offsetof(struct nft_rule_dp, data);
8468                 if (WARN_ON_ONCE(data > data_boundary))
8469                         return -ENOMEM;
8470
8471                 size = 0;
8472                 track.last = nft_expr_last(rule);
8473                 nft_rule_for_each_expr(expr, last, rule) {
8474                         track.cur = expr;
8475
8476                         if (nft_expr_reduce(&track, expr)) {
8477                                 expr = track.cur;
8478                                 continue;
8479                         }
8480
8481                         if (WARN_ON_ONCE(data + expr->ops->size > data_boundary))
8482                                 return -ENOMEM;
8483
8484                         memcpy(data + size, expr, expr->ops->size);
8485                         size += expr->ops->size;
8486                 }
8487                 if (WARN_ON_ONCE(size >= 1 << 12))
8488                         return -ENOMEM;
8489
8490                 prule->handle = rule->handle;
8491                 prule->dlen = size;
8492                 prule->is_last = 0;
8493
8494                 data += size;
8495                 size = 0;
8496                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
8497         }
8498
8499         prule = (struct nft_rule_dp *)data;
8500         data += offsetof(struct nft_rule_dp, data);
8501         if (WARN_ON_ONCE(data > data_boundary))
8502                 return -ENOMEM;
8503
8504         nft_last_rule(chain->blob_next, prule);
8505
8506         return 0;
8507 }
8508
8509 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8510 {
8511         struct nftables_pernet *nft_net = nft_pernet(net);
8512         struct nft_trans *trans, *next;
8513
8514         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8515                 struct nft_chain *chain = trans->ctx.chain;
8516
8517                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8518                     trans->msg_type == NFT_MSG_DELRULE) {
8519                         kvfree(chain->blob_next);
8520                         chain->blob_next = NULL;
8521                 }
8522         }
8523 }
8524
8525 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8526 {
8527         struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8528
8529         kvfree(o->blob);
8530 }
8531
8532 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
8533 {
8534         struct nft_rules_old *old;
8535
8536         /* rcu_head is after end marker */
8537         old = (void *)blob + sizeof(*blob) + blob->size;
8538         old->blob = blob;
8539
8540         call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8541 }
8542
8543 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8544 {
8545         struct nft_rule_blob *g0, *g1;
8546         bool next_genbit;
8547
8548         next_genbit = nft_gencursor_next(net);
8549
8550         g0 = rcu_dereference_protected(chain->blob_gen_0,
8551                                        lockdep_commit_lock_is_held(net));
8552         g1 = rcu_dereference_protected(chain->blob_gen_1,
8553                                        lockdep_commit_lock_is_held(net));
8554
8555         /* No changes to this chain? */
8556         if (chain->blob_next == NULL) {
8557                 /* chain had no change in last or next generation */
8558                 if (g0 == g1)
8559                         return;
8560                 /*
8561                  * chain had no change in this generation; make sure next
8562                  * one uses same rules as current generation.
8563                  */
8564                 if (next_genbit) {
8565                         rcu_assign_pointer(chain->blob_gen_1, g0);
8566                         nf_tables_commit_chain_free_rules_old(g1);
8567                 } else {
8568                         rcu_assign_pointer(chain->blob_gen_0, g1);
8569                         nf_tables_commit_chain_free_rules_old(g0);
8570                 }
8571
8572                 return;
8573         }
8574
8575         if (next_genbit)
8576                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
8577         else
8578                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
8579
8580         chain->blob_next = NULL;
8581
8582         if (g0 == g1)
8583                 return;
8584
8585         if (next_genbit)
8586                 nf_tables_commit_chain_free_rules_old(g1);
8587         else
8588                 nf_tables_commit_chain_free_rules_old(g0);
8589 }
8590
8591 static void nft_obj_del(struct nft_object *obj)
8592 {
8593         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8594         list_del_rcu(&obj->list);
8595 }
8596
8597 void nft_chain_del(struct nft_chain *chain)
8598 {
8599         struct nft_table *table = chain->table;
8600
8601         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8602                                      nft_chain_ht_params));
8603         list_del_rcu(&chain->list);
8604 }
8605
8606 static void nf_tables_module_autoload_cleanup(struct net *net)
8607 {
8608         struct nftables_pernet *nft_net = nft_pernet(net);
8609         struct nft_module_request *req, *next;
8610
8611         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8612         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8613                 WARN_ON_ONCE(!req->done);
8614                 list_del(&req->list);
8615                 kfree(req);
8616         }
8617 }
8618
8619 static void nf_tables_commit_release(struct net *net)
8620 {
8621         struct nftables_pernet *nft_net = nft_pernet(net);
8622         struct nft_trans *trans;
8623
8624         /* all side effects have to be made visible.
8625          * For example, if a chain named 'foo' has been deleted, a
8626          * new transaction must not find it anymore.
8627          *
8628          * Memory reclaim happens asynchronously from work queue
8629          * to prevent expensive synchronize_rcu() in commit phase.
8630          */
8631         if (list_empty(&nft_net->commit_list)) {
8632                 nf_tables_module_autoload_cleanup(net);
8633                 mutex_unlock(&nft_net->commit_mutex);
8634                 return;
8635         }
8636
8637         trans = list_last_entry(&nft_net->commit_list,
8638                                 struct nft_trans, list);
8639         get_net(trans->ctx.net);
8640         WARN_ON_ONCE(trans->put_net);
8641
8642         trans->put_net = true;
8643         spin_lock(&nf_tables_destroy_list_lock);
8644         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
8645         spin_unlock(&nf_tables_destroy_list_lock);
8646
8647         nf_tables_module_autoload_cleanup(net);
8648         schedule_work(&trans_destroy_work);
8649
8650         mutex_unlock(&nft_net->commit_mutex);
8651 }
8652
8653 static void nft_commit_notify(struct net *net, u32 portid)
8654 {
8655         struct nftables_pernet *nft_net = nft_pernet(net);
8656         struct sk_buff *batch_skb = NULL, *nskb, *skb;
8657         unsigned char *data;
8658         int len;
8659
8660         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
8661                 if (!batch_skb) {
8662 new_batch:
8663                         batch_skb = skb;
8664                         len = NLMSG_GOODSIZE - skb->len;
8665                         list_del(&skb->list);
8666                         continue;
8667                 }
8668                 len -= skb->len;
8669                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8670                         data = skb_put(batch_skb, skb->len);
8671                         memcpy(data, skb->data, skb->len);
8672                         list_del(&skb->list);
8673                         kfree_skb(skb);
8674                         continue;
8675                 }
8676                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8677                                NFT_CB(batch_skb).report, GFP_KERNEL);
8678                 goto new_batch;
8679         }
8680
8681         if (batch_skb) {
8682                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8683                                NFT_CB(batch_skb).report, GFP_KERNEL);
8684         }
8685
8686         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
8687 }
8688
8689 static int nf_tables_commit_audit_alloc(struct list_head *adl,
8690                                         struct nft_table *table)
8691 {
8692         struct nft_audit_data *adp;
8693
8694         list_for_each_entry(adp, adl, list) {
8695                 if (adp->table == table)
8696                         return 0;
8697         }
8698         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
8699         if (!adp)
8700                 return -ENOMEM;
8701         adp->table = table;
8702         list_add(&adp->list, adl);
8703         return 0;
8704 }
8705
8706 static void nf_tables_commit_audit_free(struct list_head *adl)
8707 {
8708         struct nft_audit_data *adp, *adn;
8709
8710         list_for_each_entry_safe(adp, adn, adl, list) {
8711                 list_del(&adp->list);
8712                 kfree(adp);
8713         }
8714 }
8715
8716 static void nf_tables_commit_audit_collect(struct list_head *adl,
8717                                            struct nft_table *table, u32 op)
8718 {
8719         struct nft_audit_data *adp;
8720
8721         list_for_each_entry(adp, adl, list) {
8722                 if (adp->table == table)
8723                         goto found;
8724         }
8725         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
8726         return;
8727 found:
8728         adp->entries++;
8729         if (!adp->op || adp->op > op)
8730                 adp->op = op;
8731 }
8732
8733 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
8734
8735 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
8736 {
8737         struct nft_audit_data *adp, *adn;
8738         char aubuf[AUNFTABLENAMELEN];
8739
8740         list_for_each_entry_safe(adp, adn, adl, list) {
8741                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
8742                          generation);
8743                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
8744                                 nft2audit_op[adp->op], GFP_KERNEL);
8745                 list_del(&adp->list);
8746                 kfree(adp);
8747         }
8748 }
8749
8750 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8751 {
8752         struct nftables_pernet *nft_net = nft_pernet(net);
8753         struct nft_trans *trans, *next;
8754         struct nft_trans_elem *te;
8755         struct nft_chain *chain;
8756         struct nft_table *table;
8757         LIST_HEAD(adl);
8758         int err;
8759
8760         if (list_empty(&nft_net->commit_list)) {
8761                 mutex_unlock(&nft_net->commit_mutex);
8762                 return 0;
8763         }
8764
8765         /* 0. Validate ruleset, otherwise roll back for error reporting. */
8766         if (nf_tables_validate(net) < 0)
8767                 return -EAGAIN;
8768
8769         err = nft_flow_rule_offload_commit(net);
8770         if (err < 0)
8771                 return err;
8772
8773         /* 1.  Allocate space for next generation rules_gen_X[] */
8774         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8775                 int ret;
8776
8777                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
8778                 if (ret) {
8779                         nf_tables_commit_chain_prepare_cancel(net);
8780                         nf_tables_commit_audit_free(&adl);
8781                         return ret;
8782                 }
8783                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8784                     trans->msg_type == NFT_MSG_DELRULE) {
8785                         chain = trans->ctx.chain;
8786
8787                         ret = nf_tables_commit_chain_prepare(net, chain);
8788                         if (ret < 0) {
8789                                 nf_tables_commit_chain_prepare_cancel(net);
8790                                 nf_tables_commit_audit_free(&adl);
8791                                 return ret;
8792                         }
8793                 }
8794         }
8795
8796         /* step 2.  Make rules_gen_X visible to packet path */
8797         list_for_each_entry(table, &nft_net->tables, list) {
8798                 list_for_each_entry(chain, &table->chains, list)
8799                         nf_tables_commit_chain(net, chain);
8800         }
8801
8802         /*
8803          * Bump generation counter, invalidate any dump in progress.
8804          * Cannot fail after this point.
8805          */
8806         while (++nft_net->base_seq == 0)
8807                 ;
8808
8809         /* step 3. Start new generation, rules_gen_X now in use. */
8810         net->nft.gencursor = nft_gencursor_next(net);
8811
8812         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8813                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
8814                                                trans->msg_type);
8815                 switch (trans->msg_type) {
8816                 case NFT_MSG_NEWTABLE:
8817                         if (nft_trans_table_update(trans)) {
8818                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8819                                         nft_trans_destroy(trans);
8820                                         break;
8821                                 }
8822                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
8823                                         nf_tables_table_disable(net, trans->ctx.table);
8824
8825                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8826                         } else {
8827                                 nft_clear(net, trans->ctx.table);
8828                         }
8829                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8830                         nft_trans_destroy(trans);
8831                         break;
8832                 case NFT_MSG_DELTABLE:
8833                         list_del_rcu(&trans->ctx.table->list);
8834                         nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8835                         break;
8836                 case NFT_MSG_NEWCHAIN:
8837                         if (nft_trans_chain_update(trans)) {
8838                                 nft_chain_commit_update(trans);
8839                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8840                                 /* trans destroyed after rcu grace period */
8841                         } else {
8842                                 nft_chain_commit_drop_policy(trans);
8843                                 nft_clear(net, trans->ctx.chain);
8844                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8845                                 nft_trans_destroy(trans);
8846                         }
8847                         break;
8848                 case NFT_MSG_DELCHAIN:
8849                         nft_chain_del(trans->ctx.chain);
8850                         nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8851                         nf_tables_unregister_hook(trans->ctx.net,
8852                                                   trans->ctx.table,
8853                                                   trans->ctx.chain);
8854                         break;
8855                 case NFT_MSG_NEWRULE:
8856                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8857                         nf_tables_rule_notify(&trans->ctx,
8858                                               nft_trans_rule(trans),
8859                                               NFT_MSG_NEWRULE);
8860                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8861                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8862
8863                         nft_trans_destroy(trans);
8864                         break;
8865                 case NFT_MSG_DELRULE:
8866                         list_del_rcu(&nft_trans_rule(trans)->list);
8867                         nf_tables_rule_notify(&trans->ctx,
8868                                               nft_trans_rule(trans),
8869                                               NFT_MSG_DELRULE);
8870                         nft_rule_expr_deactivate(&trans->ctx,
8871                                                  nft_trans_rule(trans),
8872                                                  NFT_TRANS_COMMIT);
8873                         break;
8874                 case NFT_MSG_NEWSET:
8875                         nft_clear(net, nft_trans_set(trans));
8876                         /* This avoids hitting -EBUSY when deleting the table
8877                          * from the transaction.
8878                          */
8879                         if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8880                             !list_empty(&nft_trans_set(trans)->bindings))
8881                                 trans->ctx.table->use--;
8882
8883                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8884                                              NFT_MSG_NEWSET, GFP_KERNEL);
8885                         nft_trans_destroy(trans);
8886                         break;
8887                 case NFT_MSG_DELSET:
8888                         list_del_rcu(&nft_trans_set(trans)->list);
8889                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8890                                              NFT_MSG_DELSET, GFP_KERNEL);
8891                         break;
8892                 case NFT_MSG_NEWSETELEM:
8893                         te = (struct nft_trans_elem *)trans->data;
8894
8895                         nft_setelem_activate(net, te->set, &te->elem);
8896                         nf_tables_setelem_notify(&trans->ctx, te->set,
8897                                                  &te->elem,
8898                                                  NFT_MSG_NEWSETELEM);
8899                         nft_trans_destroy(trans);
8900                         break;
8901                 case NFT_MSG_DELSETELEM:
8902                         te = (struct nft_trans_elem *)trans->data;
8903
8904                         nf_tables_setelem_notify(&trans->ctx, te->set,
8905                                                  &te->elem,
8906                                                  NFT_MSG_DELSETELEM);
8907                         nft_setelem_remove(net, te->set, &te->elem);
8908                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
8909                                 atomic_dec(&te->set->nelems);
8910                                 te->set->ndeact--;
8911                         }
8912                         break;
8913                 case NFT_MSG_NEWOBJ:
8914                         if (nft_trans_obj_update(trans)) {
8915                                 nft_obj_commit_update(trans);
8916                                 nf_tables_obj_notify(&trans->ctx,
8917                                                      nft_trans_obj(trans),
8918                                                      NFT_MSG_NEWOBJ);
8919                         } else {
8920                                 nft_clear(net, nft_trans_obj(trans));
8921                                 nf_tables_obj_notify(&trans->ctx,
8922                                                      nft_trans_obj(trans),
8923                                                      NFT_MSG_NEWOBJ);
8924                                 nft_trans_destroy(trans);
8925                         }
8926                         break;
8927                 case NFT_MSG_DELOBJ:
8928                         nft_obj_del(nft_trans_obj(trans));
8929                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8930                                              NFT_MSG_DELOBJ);
8931                         break;
8932                 case NFT_MSG_NEWFLOWTABLE:
8933                         if (nft_trans_flowtable_update(trans)) {
8934                                 nft_trans_flowtable(trans)->data.flags =
8935                                         nft_trans_flowtable_flags(trans);
8936                                 nf_tables_flowtable_notify(&trans->ctx,
8937                                                            nft_trans_flowtable(trans),
8938                                                            &nft_trans_flowtable_hooks(trans),
8939                                                            NFT_MSG_NEWFLOWTABLE);
8940                                 list_splice(&nft_trans_flowtable_hooks(trans),
8941                                             &nft_trans_flowtable(trans)->hook_list);
8942                         } else {
8943                                 nft_clear(net, nft_trans_flowtable(trans));
8944                                 nf_tables_flowtable_notify(&trans->ctx,
8945                                                            nft_trans_flowtable(trans),
8946                                                            &nft_trans_flowtable(trans)->hook_list,
8947                                                            NFT_MSG_NEWFLOWTABLE);
8948                         }
8949                         nft_trans_destroy(trans);
8950                         break;
8951                 case NFT_MSG_DELFLOWTABLE:
8952                         if (nft_trans_flowtable_update(trans)) {
8953                                 nf_tables_flowtable_notify(&trans->ctx,
8954                                                            nft_trans_flowtable(trans),
8955                                                            &nft_trans_flowtable_hooks(trans),
8956                                                            NFT_MSG_DELFLOWTABLE);
8957                                 nft_unregister_flowtable_net_hooks(net,
8958                                                                    &nft_trans_flowtable_hooks(trans));
8959                         } else {
8960                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8961                                 nf_tables_flowtable_notify(&trans->ctx,
8962                                                            nft_trans_flowtable(trans),
8963                                                            &nft_trans_flowtable(trans)->hook_list,
8964                                                            NFT_MSG_DELFLOWTABLE);
8965                                 nft_unregister_flowtable_net_hooks(net,
8966                                                 &nft_trans_flowtable(trans)->hook_list);
8967                         }
8968                         break;
8969                 }
8970         }
8971
8972         nft_commit_notify(net, NETLINK_CB(skb).portid);
8973         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8974         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
8975         nf_tables_commit_release(net);
8976
8977         return 0;
8978 }
8979
8980 static void nf_tables_module_autoload(struct net *net)
8981 {
8982         struct nftables_pernet *nft_net = nft_pernet(net);
8983         struct nft_module_request *req, *next;
8984         LIST_HEAD(module_list);
8985
8986         list_splice_init(&nft_net->module_list, &module_list);
8987         mutex_unlock(&nft_net->commit_mutex);
8988         list_for_each_entry_safe(req, next, &module_list, list) {
8989                 request_module("%s", req->module);
8990                 req->done = true;
8991         }
8992         mutex_lock(&nft_net->commit_mutex);
8993         list_splice(&module_list, &nft_net->module_list);
8994 }
8995
8996 static void nf_tables_abort_release(struct nft_trans *trans)
8997 {
8998         switch (trans->msg_type) {
8999         case NFT_MSG_NEWTABLE:
9000                 nf_tables_table_destroy(&trans->ctx);
9001                 break;
9002         case NFT_MSG_NEWCHAIN:
9003                 nf_tables_chain_destroy(&trans->ctx);
9004                 break;
9005         case NFT_MSG_NEWRULE:
9006                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9007                 break;
9008         case NFT_MSG_NEWSET:
9009                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9010                 break;
9011         case NFT_MSG_NEWSETELEM:
9012                 nft_set_elem_destroy(nft_trans_elem_set(trans),
9013                                      nft_trans_elem(trans).priv, true);
9014                 break;
9015         case NFT_MSG_NEWOBJ:
9016                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9017                 break;
9018         case NFT_MSG_NEWFLOWTABLE:
9019                 if (nft_trans_flowtable_update(trans))
9020                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9021                 else
9022                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9023                 break;
9024         }
9025         kfree(trans);
9026 }
9027
9028 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9029 {
9030         struct nftables_pernet *nft_net = nft_pernet(net);
9031         struct nft_trans *trans, *next;
9032         struct nft_trans_elem *te;
9033
9034         if (action == NFNL_ABORT_VALIDATE &&
9035             nf_tables_validate(net) < 0)
9036                 return -EAGAIN;
9037
9038         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9039                                          list) {
9040                 switch (trans->msg_type) {
9041                 case NFT_MSG_NEWTABLE:
9042                         if (nft_trans_table_update(trans)) {
9043                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9044                                         nft_trans_destroy(trans);
9045                                         break;
9046                                 }
9047                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9048                                         nf_tables_table_disable(net, trans->ctx.table);
9049                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9050                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9051                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9052                                 }
9053                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9054                                 nft_trans_destroy(trans);
9055                         } else {
9056                                 list_del_rcu(&trans->ctx.table->list);
9057                         }
9058                         break;
9059                 case NFT_MSG_DELTABLE:
9060                         nft_clear(trans->ctx.net, trans->ctx.table);
9061                         nft_trans_destroy(trans);
9062                         break;
9063                 case NFT_MSG_NEWCHAIN:
9064                         if (nft_trans_chain_update(trans)) {
9065                                 free_percpu(nft_trans_chain_stats(trans));
9066                                 kfree(nft_trans_chain_name(trans));
9067                                 nft_trans_destroy(trans);
9068                         } else {
9069                                 if (nft_chain_is_bound(trans->ctx.chain)) {
9070                                         nft_trans_destroy(trans);
9071                                         break;
9072                                 }
9073                                 trans->ctx.table->use--;
9074                                 nft_chain_del(trans->ctx.chain);
9075                                 nf_tables_unregister_hook(trans->ctx.net,
9076                                                           trans->ctx.table,
9077                                                           trans->ctx.chain);
9078                         }
9079                         break;
9080                 case NFT_MSG_DELCHAIN:
9081                         trans->ctx.table->use++;
9082                         nft_clear(trans->ctx.net, trans->ctx.chain);
9083                         nft_trans_destroy(trans);
9084                         break;
9085                 case NFT_MSG_NEWRULE:
9086                         trans->ctx.chain->use--;
9087                         list_del_rcu(&nft_trans_rule(trans)->list);
9088                         nft_rule_expr_deactivate(&trans->ctx,
9089                                                  nft_trans_rule(trans),
9090                                                  NFT_TRANS_ABORT);
9091                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9092                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9093                         break;
9094                 case NFT_MSG_DELRULE:
9095                         trans->ctx.chain->use++;
9096                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9097                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9098                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9099                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9100
9101                         nft_trans_destroy(trans);
9102                         break;
9103                 case NFT_MSG_NEWSET:
9104                         trans->ctx.table->use--;
9105                         if (nft_trans_set_bound(trans)) {
9106                                 nft_trans_destroy(trans);
9107                                 break;
9108                         }
9109                         list_del_rcu(&nft_trans_set(trans)->list);
9110                         break;
9111                 case NFT_MSG_DELSET:
9112                         trans->ctx.table->use++;
9113                         nft_clear(trans->ctx.net, nft_trans_set(trans));
9114                         nft_trans_destroy(trans);
9115                         break;
9116                 case NFT_MSG_NEWSETELEM:
9117                         if (nft_trans_elem_set_bound(trans)) {
9118                                 nft_trans_destroy(trans);
9119                                 break;
9120                         }
9121                         te = (struct nft_trans_elem *)trans->data;
9122                         nft_setelem_remove(net, te->set, &te->elem);
9123                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9124                                 atomic_dec(&te->set->nelems);
9125                         break;
9126                 case NFT_MSG_DELSETELEM:
9127                         te = (struct nft_trans_elem *)trans->data;
9128
9129                         nft_setelem_data_activate(net, te->set, &te->elem);
9130                         nft_setelem_activate(net, te->set, &te->elem);
9131                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9132                                 te->set->ndeact--;
9133
9134                         nft_trans_destroy(trans);
9135                         break;
9136                 case NFT_MSG_NEWOBJ:
9137                         if (nft_trans_obj_update(trans)) {
9138                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9139                                 nft_trans_destroy(trans);
9140                         } else {
9141                                 trans->ctx.table->use--;
9142                                 nft_obj_del(nft_trans_obj(trans));
9143                         }
9144                         break;
9145                 case NFT_MSG_DELOBJ:
9146                         trans->ctx.table->use++;
9147                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
9148                         nft_trans_destroy(trans);
9149                         break;
9150                 case NFT_MSG_NEWFLOWTABLE:
9151                         if (nft_trans_flowtable_update(trans)) {
9152                                 nft_unregister_flowtable_net_hooks(net,
9153                                                 &nft_trans_flowtable_hooks(trans));
9154                         } else {
9155                                 trans->ctx.table->use--;
9156                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9157                                 nft_unregister_flowtable_net_hooks(net,
9158                                                 &nft_trans_flowtable(trans)->hook_list);
9159                         }
9160                         break;
9161                 case NFT_MSG_DELFLOWTABLE:
9162                         if (nft_trans_flowtable_update(trans)) {
9163                                 list_splice(&nft_trans_flowtable_hooks(trans),
9164                                             &nft_trans_flowtable(trans)->hook_list);
9165                         } else {
9166                                 trans->ctx.table->use++;
9167                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9168                         }
9169                         nft_trans_destroy(trans);
9170                         break;
9171                 }
9172         }
9173
9174         synchronize_rcu();
9175
9176         list_for_each_entry_safe_reverse(trans, next,
9177                                          &nft_net->commit_list, list) {
9178                 list_del(&trans->list);
9179                 nf_tables_abort_release(trans);
9180         }
9181
9182         if (action == NFNL_ABORT_AUTOLOAD)
9183                 nf_tables_module_autoload(net);
9184         else
9185                 nf_tables_module_autoload_cleanup(net);
9186
9187         return 0;
9188 }
9189
9190 static void nf_tables_cleanup(struct net *net)
9191 {
9192         nft_validate_state_update(net, NFT_VALIDATE_SKIP);
9193 }
9194
9195 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9196                            enum nfnl_abort_action action)
9197 {
9198         struct nftables_pernet *nft_net = nft_pernet(net);
9199         int ret = __nf_tables_abort(net, action);
9200
9201         mutex_unlock(&nft_net->commit_mutex);
9202
9203         return ret;
9204 }
9205
9206 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9207 {
9208         struct nftables_pernet *nft_net = nft_pernet(net);
9209         bool genid_ok;
9210
9211         mutex_lock(&nft_net->commit_mutex);
9212
9213         genid_ok = genid == 0 || nft_net->base_seq == genid;
9214         if (!genid_ok)
9215                 mutex_unlock(&nft_net->commit_mutex);
9216
9217         /* else, commit mutex has to be released by commit or abort function */
9218         return genid_ok;
9219 }
9220
9221 static const struct nfnetlink_subsystem nf_tables_subsys = {
9222         .name           = "nf_tables",
9223         .subsys_id      = NFNL_SUBSYS_NFTABLES,
9224         .cb_count       = NFT_MSG_MAX,
9225         .cb             = nf_tables_cb,
9226         .commit         = nf_tables_commit,
9227         .abort          = nf_tables_abort,
9228         .cleanup        = nf_tables_cleanup,
9229         .valid_genid    = nf_tables_valid_genid,
9230         .owner          = THIS_MODULE,
9231 };
9232
9233 int nft_chain_validate_dependency(const struct nft_chain *chain,
9234                                   enum nft_chain_types type)
9235 {
9236         const struct nft_base_chain *basechain;
9237
9238         if (nft_is_base_chain(chain)) {
9239                 basechain = nft_base_chain(chain);
9240                 if (basechain->type->type != type)
9241                         return -EOPNOTSUPP;
9242         }
9243         return 0;
9244 }
9245 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9246
9247 int nft_chain_validate_hooks(const struct nft_chain *chain,
9248                              unsigned int hook_flags)
9249 {
9250         struct nft_base_chain *basechain;
9251
9252         if (nft_is_base_chain(chain)) {
9253                 basechain = nft_base_chain(chain);
9254
9255                 if ((1 << basechain->ops.hooknum) & hook_flags)
9256                         return 0;
9257
9258                 return -EOPNOTSUPP;
9259         }
9260
9261         return 0;
9262 }
9263 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9264
9265 /*
9266  * Loop detection - walk through the ruleset beginning at the destination chain
9267  * of a new jump until either the source chain is reached (loop) or all
9268  * reachable chains have been traversed.
9269  *
9270  * The loop check is performed whenever a new jump verdict is added to an
9271  * expression or verdict map or a verdict map is bound to a new chain.
9272  */
9273
9274 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9275                                  const struct nft_chain *chain);
9276
9277 static int nft_check_loops(const struct nft_ctx *ctx,
9278                            const struct nft_set_ext *ext)
9279 {
9280         const struct nft_data *data;
9281         int ret;
9282
9283         data = nft_set_ext_data(ext);
9284         switch (data->verdict.code) {
9285         case NFT_JUMP:
9286         case NFT_GOTO:
9287                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9288                 break;
9289         default:
9290                 ret = 0;
9291                 break;
9292         }
9293
9294         return ret;
9295 }
9296
9297 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9298                                         struct nft_set *set,
9299                                         const struct nft_set_iter *iter,
9300                                         struct nft_set_elem *elem)
9301 {
9302         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9303
9304         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9305             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9306                 return 0;
9307
9308         return nft_check_loops(ctx, ext);
9309 }
9310
9311 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9312                                   struct nft_set *set)
9313 {
9314         u8 genmask = nft_genmask_next(ctx->net);
9315         struct nft_set_elem_catchall *catchall;
9316         struct nft_set_ext *ext;
9317         int ret = 0;
9318
9319         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9320                 ext = nft_set_elem_ext(set, catchall->elem);
9321                 if (!nft_set_elem_active(ext, genmask))
9322                         continue;
9323
9324                 ret = nft_check_loops(ctx, ext);
9325                 if (ret < 0)
9326                         return ret;
9327         }
9328
9329         return ret;
9330 }
9331
9332 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9333                                  const struct nft_chain *chain)
9334 {
9335         const struct nft_rule *rule;
9336         const struct nft_expr *expr, *last;
9337         struct nft_set *set;
9338         struct nft_set_binding *binding;
9339         struct nft_set_iter iter;
9340
9341         if (ctx->chain == chain)
9342                 return -ELOOP;
9343
9344         list_for_each_entry(rule, &chain->rules, list) {
9345                 nft_rule_for_each_expr(expr, last, rule) {
9346                         struct nft_immediate_expr *priv;
9347                         const struct nft_data *data;
9348                         int err;
9349
9350                         if (strcmp(expr->ops->type->name, "immediate"))
9351                                 continue;
9352
9353                         priv = nft_expr_priv(expr);
9354                         if (priv->dreg != NFT_REG_VERDICT)
9355                                 continue;
9356
9357                         data = &priv->data;
9358                         switch (data->verdict.code) {
9359                         case NFT_JUMP:
9360                         case NFT_GOTO:
9361                                 err = nf_tables_check_loops(ctx,
9362                                                         data->verdict.chain);
9363                                 if (err < 0)
9364                                         return err;
9365                                 break;
9366                         default:
9367                                 break;
9368                         }
9369                 }
9370         }
9371
9372         list_for_each_entry(set, &ctx->table->sets, list) {
9373                 if (!nft_is_active_next(ctx->net, set))
9374                         continue;
9375                 if (!(set->flags & NFT_SET_MAP) ||
9376                     set->dtype != NFT_DATA_VERDICT)
9377                         continue;
9378
9379                 list_for_each_entry(binding, &set->bindings, list) {
9380                         if (!(binding->flags & NFT_SET_MAP) ||
9381                             binding->chain != chain)
9382                                 continue;
9383
9384                         iter.genmask    = nft_genmask_next(ctx->net);
9385                         iter.skip       = 0;
9386                         iter.count      = 0;
9387                         iter.err        = 0;
9388                         iter.fn         = nf_tables_loop_check_setelem;
9389
9390                         set->ops->walk(ctx, set, &iter);
9391                         if (!iter.err)
9392                                 iter.err = nft_set_catchall_loops(ctx, set);
9393
9394                         if (iter.err < 0)
9395                                 return iter.err;
9396                 }
9397         }
9398
9399         return 0;
9400 }
9401
9402 /**
9403  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
9404  *
9405  *      @attr: netlink attribute to fetch value from
9406  *      @max: maximum value to be stored in dest
9407  *      @dest: pointer to the variable
9408  *
9409  *      Parse, check and store a given u32 netlink attribute into variable.
9410  *      This function returns -ERANGE if the value goes over maximum value.
9411  *      Otherwise a 0 is returned and the attribute value is stored in the
9412  *      destination variable.
9413  */
9414 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9415 {
9416         u32 val;
9417
9418         val = ntohl(nla_get_be32(attr));
9419         if (val > max)
9420                 return -ERANGE;
9421
9422         *dest = val;
9423         return 0;
9424 }
9425 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9426
9427 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
9428 {
9429         unsigned int reg;
9430
9431         reg = ntohl(nla_get_be32(attr));
9432         switch (reg) {
9433         case NFT_REG_VERDICT...NFT_REG_4:
9434                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9435                 break;
9436         case NFT_REG32_00...NFT_REG32_15:
9437                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9438                 break;
9439         default:
9440                 return -ERANGE;
9441         }
9442
9443         return 0;
9444 }
9445
9446 /**
9447  *      nft_dump_register - dump a register value to a netlink attribute
9448  *
9449  *      @skb: socket buffer
9450  *      @attr: attribute number
9451  *      @reg: register number
9452  *
9453  *      Construct a netlink attribute containing the register number. For
9454  *      compatibility reasons, register numbers being a multiple of 4 are
9455  *      translated to the corresponding 128 bit register numbers.
9456  */
9457 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9458 {
9459         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9460                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9461         else
9462                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9463
9464         return nla_put_be32(skb, attr, htonl(reg));
9465 }
9466 EXPORT_SYMBOL_GPL(nft_dump_register);
9467
9468 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9469 {
9470         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9471                 return -EINVAL;
9472         if (len == 0)
9473                 return -EINVAL;
9474         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9475                 return -ERANGE;
9476
9477         return 0;
9478 }
9479
9480 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9481 {
9482         u32 reg;
9483         int err;
9484
9485         err = nft_parse_register(attr, &reg);
9486         if (err < 0)
9487                 return err;
9488
9489         err = nft_validate_register_load(reg, len);
9490         if (err < 0)
9491                 return err;
9492
9493         *sreg = reg;
9494         return 0;
9495 }
9496 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9497
9498 static int nft_validate_register_store(const struct nft_ctx *ctx,
9499                                        enum nft_registers reg,
9500                                        const struct nft_data *data,
9501                                        enum nft_data_types type,
9502                                        unsigned int len)
9503 {
9504         int err;
9505
9506         switch (reg) {
9507         case NFT_REG_VERDICT:
9508                 if (type != NFT_DATA_VERDICT)
9509                         return -EINVAL;
9510
9511                 if (data != NULL &&
9512                     (data->verdict.code == NFT_GOTO ||
9513                      data->verdict.code == NFT_JUMP)) {
9514                         err = nf_tables_check_loops(ctx, data->verdict.chain);
9515                         if (err < 0)
9516                                 return err;
9517                 }
9518
9519                 return 0;
9520         default:
9521                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9522                         return -EINVAL;
9523                 if (len == 0)
9524                         return -EINVAL;
9525                 if (reg * NFT_REG32_SIZE + len >
9526                     sizeof_field(struct nft_regs, data))
9527                         return -ERANGE;
9528
9529                 if (data != NULL && type != NFT_DATA_VALUE)
9530                         return -EINVAL;
9531                 return 0;
9532         }
9533 }
9534
9535 int nft_parse_register_store(const struct nft_ctx *ctx,
9536                              const struct nlattr *attr, u8 *dreg,
9537                              const struct nft_data *data,
9538                              enum nft_data_types type, unsigned int len)
9539 {
9540         int err;
9541         u32 reg;
9542
9543         err = nft_parse_register(attr, &reg);
9544         if (err < 0)
9545                 return err;
9546
9547         err = nft_validate_register_store(ctx, reg, data, type, len);
9548         if (err < 0)
9549                 return err;
9550
9551         *dreg = reg;
9552         return 0;
9553 }
9554 EXPORT_SYMBOL_GPL(nft_parse_register_store);
9555
9556 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9557         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
9558         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
9559                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
9560         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9561 };
9562
9563 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9564                             struct nft_data_desc *desc, const struct nlattr *nla)
9565 {
9566         u8 genmask = nft_genmask_next(ctx->net);
9567         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9568         struct nft_chain *chain;
9569         int err;
9570
9571         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9572                                           nft_verdict_policy, NULL);
9573         if (err < 0)
9574                 return err;
9575
9576         if (!tb[NFTA_VERDICT_CODE])
9577                 return -EINVAL;
9578         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9579
9580         switch (data->verdict.code) {
9581         default:
9582                 switch (data->verdict.code & NF_VERDICT_MASK) {
9583                 case NF_ACCEPT:
9584                 case NF_DROP:
9585                 case NF_QUEUE:
9586                         break;
9587                 default:
9588                         return -EINVAL;
9589                 }
9590                 fallthrough;
9591         case NFT_CONTINUE:
9592         case NFT_BREAK:
9593         case NFT_RETURN:
9594                 break;
9595         case NFT_JUMP:
9596         case NFT_GOTO:
9597                 if (tb[NFTA_VERDICT_CHAIN]) {
9598                         chain = nft_chain_lookup(ctx->net, ctx->table,
9599                                                  tb[NFTA_VERDICT_CHAIN],
9600                                                  genmask);
9601                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9602                         chain = nft_chain_lookup_byid(ctx->net,
9603                                                       tb[NFTA_VERDICT_CHAIN_ID]);
9604                         if (IS_ERR(chain))
9605                                 return PTR_ERR(chain);
9606                 } else {
9607                         return -EINVAL;
9608                 }
9609
9610                 if (IS_ERR(chain))
9611                         return PTR_ERR(chain);
9612                 if (nft_is_base_chain(chain))
9613                         return -EOPNOTSUPP;
9614
9615                 chain->use++;
9616                 data->verdict.chain = chain;
9617                 break;
9618         }
9619
9620         desc->len = sizeof(data->verdict);
9621         desc->type = NFT_DATA_VERDICT;
9622         return 0;
9623 }
9624
9625 static void nft_verdict_uninit(const struct nft_data *data)
9626 {
9627         struct nft_chain *chain;
9628         struct nft_rule *rule;
9629
9630         switch (data->verdict.code) {
9631         case NFT_JUMP:
9632         case NFT_GOTO:
9633                 chain = data->verdict.chain;
9634                 chain->use--;
9635
9636                 if (!nft_chain_is_bound(chain))
9637                         break;
9638
9639                 chain->table->use--;
9640                 list_for_each_entry(rule, &chain->rules, list)
9641                         chain->use--;
9642
9643                 nft_chain_del(chain);
9644                 break;
9645         }
9646 }
9647
9648 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
9649 {
9650         struct nlattr *nest;
9651
9652         nest = nla_nest_start_noflag(skb, type);
9653         if (!nest)
9654                 goto nla_put_failure;
9655
9656         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
9657                 goto nla_put_failure;
9658
9659         switch (v->code) {
9660         case NFT_JUMP:
9661         case NFT_GOTO:
9662                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
9663                                    v->chain->name))
9664                         goto nla_put_failure;
9665         }
9666         nla_nest_end(skb, nest);
9667         return 0;
9668
9669 nla_put_failure:
9670         return -1;
9671 }
9672
9673 static int nft_value_init(const struct nft_ctx *ctx,
9674                           struct nft_data *data, unsigned int size,
9675                           struct nft_data_desc *desc, const struct nlattr *nla)
9676 {
9677         unsigned int len;
9678
9679         len = nla_len(nla);
9680         if (len == 0)
9681                 return -EINVAL;
9682         if (len > size)
9683                 return -EOVERFLOW;
9684
9685         nla_memcpy(data->data, nla, len);
9686         desc->type = NFT_DATA_VALUE;
9687         desc->len  = len;
9688         return 0;
9689 }
9690
9691 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
9692                           unsigned int len)
9693 {
9694         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
9695 }
9696
9697 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
9698         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
9699         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
9700 };
9701
9702 /**
9703  *      nft_data_init - parse nf_tables data netlink attributes
9704  *
9705  *      @ctx: context of the expression using the data
9706  *      @data: destination struct nft_data
9707  *      @size: maximum data length
9708  *      @desc: data description
9709  *      @nla: netlink attribute containing data
9710  *
9711  *      Parse the netlink data attributes and initialize a struct nft_data.
9712  *      The type and length of data are returned in the data description.
9713  *
9714  *      The caller can indicate that it only wants to accept data of type
9715  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
9716  */
9717 int nft_data_init(const struct nft_ctx *ctx,
9718                   struct nft_data *data, unsigned int size,
9719                   struct nft_data_desc *desc, const struct nlattr *nla)
9720 {
9721         struct nlattr *tb[NFTA_DATA_MAX + 1];
9722         int err;
9723
9724         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
9725                                           nft_data_policy, NULL);
9726         if (err < 0)
9727                 return err;
9728
9729         if (tb[NFTA_DATA_VALUE])
9730                 return nft_value_init(ctx, data, size, desc,
9731                                       tb[NFTA_DATA_VALUE]);
9732         if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
9733                 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
9734         return -EINVAL;
9735 }
9736 EXPORT_SYMBOL_GPL(nft_data_init);
9737
9738 /**
9739  *      nft_data_release - release a nft_data item
9740  *
9741  *      @data: struct nft_data to release
9742  *      @type: type of data
9743  *
9744  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
9745  *      all others need to be released by calling this function.
9746  */
9747 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
9748 {
9749         if (type < NFT_DATA_VERDICT)
9750                 return;
9751         switch (type) {
9752         case NFT_DATA_VERDICT:
9753                 return nft_verdict_uninit(data);
9754         default:
9755                 WARN_ON(1);
9756         }
9757 }
9758 EXPORT_SYMBOL_GPL(nft_data_release);
9759
9760 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9761                   enum nft_data_types type, unsigned int len)
9762 {
9763         struct nlattr *nest;
9764         int err;
9765
9766         nest = nla_nest_start_noflag(skb, attr);
9767         if (nest == NULL)
9768                 return -1;
9769
9770         switch (type) {
9771         case NFT_DATA_VALUE:
9772                 err = nft_value_dump(skb, data, len);
9773                 break;
9774         case NFT_DATA_VERDICT:
9775                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
9776                 break;
9777         default:
9778                 err = -EINVAL;
9779                 WARN_ON(1);
9780         }
9781
9782         nla_nest_end(skb, nest);
9783         return err;
9784 }
9785 EXPORT_SYMBOL_GPL(nft_data_dump);
9786
9787 int __nft_release_basechain(struct nft_ctx *ctx)
9788 {
9789         struct nft_rule *rule, *nr;
9790
9791         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9792                 return 0;
9793
9794         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
9795         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9796                 list_del(&rule->list);
9797                 ctx->chain->use--;
9798                 nf_tables_rule_release(ctx, rule);
9799         }
9800         nft_chain_del(ctx->chain);
9801         ctx->table->use--;
9802         nf_tables_chain_destroy(ctx);
9803
9804         return 0;
9805 }
9806 EXPORT_SYMBOL_GPL(__nft_release_basechain);
9807
9808 static void __nft_release_hook(struct net *net, struct nft_table *table)
9809 {
9810         struct nft_flowtable *flowtable;
9811         struct nft_chain *chain;
9812
9813         list_for_each_entry(chain, &table->chains, list)
9814                 __nf_tables_unregister_hook(net, table, chain, true);
9815         list_for_each_entry(flowtable, &table->flowtables, list)
9816                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
9817                                                      true);
9818 }
9819
9820 static void __nft_release_hooks(struct net *net)
9821 {
9822         struct nftables_pernet *nft_net = nft_pernet(net);
9823         struct nft_table *table;
9824
9825         list_for_each_entry(table, &nft_net->tables, list) {
9826                 if (nft_table_has_owner(table))
9827                         continue;
9828
9829                 __nft_release_hook(net, table);
9830         }
9831 }
9832
9833 static void __nft_release_table(struct net *net, struct nft_table *table)
9834 {
9835         struct nft_flowtable *flowtable, *nf;
9836         struct nft_chain *chain, *nc;
9837         struct nft_object *obj, *ne;
9838         struct nft_rule *rule, *nr;
9839         struct nft_set *set, *ns;
9840         struct nft_ctx ctx = {
9841                 .net    = net,
9842                 .family = NFPROTO_NETDEV,
9843         };
9844
9845         ctx.family = table->family;
9846         ctx.table = table;
9847         list_for_each_entry(chain, &table->chains, list) {
9848                 ctx.chain = chain;
9849                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
9850                         list_del(&rule->list);
9851                         chain->use--;
9852                         nf_tables_rule_release(&ctx, rule);
9853                 }
9854         }
9855         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
9856                 list_del(&flowtable->list);
9857                 table->use--;
9858                 nf_tables_flowtable_destroy(flowtable);
9859         }
9860         list_for_each_entry_safe(set, ns, &table->sets, list) {
9861                 list_del(&set->list);
9862                 table->use--;
9863                 nft_set_destroy(&ctx, set);
9864         }
9865         list_for_each_entry_safe(obj, ne, &table->objects, list) {
9866                 nft_obj_del(obj);
9867                 table->use--;
9868                 nft_obj_destroy(&ctx, obj);
9869         }
9870         list_for_each_entry_safe(chain, nc, &table->chains, list) {
9871                 ctx.chain = chain;
9872                 nft_chain_del(chain);
9873                 table->use--;
9874                 nf_tables_chain_destroy(&ctx);
9875         }
9876         nf_tables_table_destroy(&ctx);
9877 }
9878
9879 static void __nft_release_tables(struct net *net)
9880 {
9881         struct nftables_pernet *nft_net = nft_pernet(net);
9882         struct nft_table *table, *nt;
9883
9884         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
9885                 if (nft_table_has_owner(table))
9886                         continue;
9887
9888                 list_del(&table->list);
9889
9890                 __nft_release_table(net, table);
9891         }
9892 }
9893
9894 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
9895                             void *ptr)
9896 {
9897         struct nft_table *table, *to_delete[8];
9898         struct nftables_pernet *nft_net;
9899         struct netlink_notify *n = ptr;
9900         struct net *net = n->net;
9901         unsigned int deleted;
9902         bool restart = false;
9903
9904         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
9905                 return NOTIFY_DONE;
9906
9907         nft_net = nft_pernet(net);
9908         deleted = 0;
9909         mutex_lock(&nft_net->commit_mutex);
9910 again:
9911         list_for_each_entry(table, &nft_net->tables, list) {
9912                 if (nft_table_has_owner(table) &&
9913                     n->portid == table->nlpid) {
9914                         __nft_release_hook(net, table);
9915                         list_del_rcu(&table->list);
9916                         to_delete[deleted++] = table;
9917                         if (deleted >= ARRAY_SIZE(to_delete))
9918                                 break;
9919                 }
9920         }
9921         if (deleted) {
9922                 restart = deleted >= ARRAY_SIZE(to_delete);
9923                 synchronize_rcu();
9924                 while (deleted)
9925                         __nft_release_table(net, to_delete[--deleted]);
9926
9927                 if (restart)
9928                         goto again;
9929         }
9930         mutex_unlock(&nft_net->commit_mutex);
9931
9932         return NOTIFY_DONE;
9933 }
9934
9935 static struct notifier_block nft_nl_notifier = {
9936         .notifier_call  = nft_rcv_nl_event,
9937 };
9938
9939 static int __net_init nf_tables_init_net(struct net *net)
9940 {
9941         struct nftables_pernet *nft_net = nft_pernet(net);
9942
9943         INIT_LIST_HEAD(&nft_net->tables);
9944         INIT_LIST_HEAD(&nft_net->commit_list);
9945         INIT_LIST_HEAD(&nft_net->module_list);
9946         INIT_LIST_HEAD(&nft_net->notify_list);
9947         mutex_init(&nft_net->commit_mutex);
9948         nft_net->base_seq = 1;
9949         nft_net->validate_state = NFT_VALIDATE_SKIP;
9950
9951         return 0;
9952 }
9953
9954 static void __net_exit nf_tables_pre_exit_net(struct net *net)
9955 {
9956         struct nftables_pernet *nft_net = nft_pernet(net);
9957
9958         mutex_lock(&nft_net->commit_mutex);
9959         __nft_release_hooks(net);
9960         mutex_unlock(&nft_net->commit_mutex);
9961 }
9962
9963 static void __net_exit nf_tables_exit_net(struct net *net)
9964 {
9965         struct nftables_pernet *nft_net = nft_pernet(net);
9966
9967         mutex_lock(&nft_net->commit_mutex);
9968         if (!list_empty(&nft_net->commit_list))
9969                 __nf_tables_abort(net, NFNL_ABORT_NONE);
9970         __nft_release_tables(net);
9971         mutex_unlock(&nft_net->commit_mutex);
9972         WARN_ON_ONCE(!list_empty(&nft_net->tables));
9973         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
9974         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9975 }
9976
9977 static struct pernet_operations nf_tables_net_ops = {
9978         .init           = nf_tables_init_net,
9979         .pre_exit       = nf_tables_pre_exit_net,
9980         .exit           = nf_tables_exit_net,
9981         .id             = &nf_tables_net_id,
9982         .size           = sizeof(struct nftables_pernet),
9983 };
9984
9985 static int __init nf_tables_module_init(void)
9986 {
9987         int err;
9988
9989         err = register_pernet_subsys(&nf_tables_net_ops);
9990         if (err < 0)
9991                 return err;
9992
9993         err = nft_chain_filter_init();
9994         if (err < 0)
9995                 goto err_chain_filter;
9996
9997         err = nf_tables_core_module_init();
9998         if (err < 0)
9999                 goto err_core_module;
10000
10001         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10002         if (err < 0)
10003                 goto err_netdev_notifier;
10004
10005         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10006         if (err < 0)
10007                 goto err_rht_objname;
10008
10009         err = nft_offload_init();
10010         if (err < 0)
10011                 goto err_offload;
10012
10013         err = netlink_register_notifier(&nft_nl_notifier);
10014         if (err < 0)
10015                 goto err_netlink_notifier;
10016
10017         /* must be last */
10018         err = nfnetlink_subsys_register(&nf_tables_subsys);
10019         if (err < 0)
10020                 goto err_nfnl_subsys;
10021
10022         nft_chain_route_init();
10023
10024         return err;
10025
10026 err_nfnl_subsys:
10027         netlink_unregister_notifier(&nft_nl_notifier);
10028 err_netlink_notifier:
10029         nft_offload_exit();
10030 err_offload:
10031         rhltable_destroy(&nft_objname_ht);
10032 err_rht_objname:
10033         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10034 err_netdev_notifier:
10035         nf_tables_core_module_exit();
10036 err_core_module:
10037         nft_chain_filter_fini();
10038 err_chain_filter:
10039         unregister_pernet_subsys(&nf_tables_net_ops);
10040         return err;
10041 }
10042
10043 static void __exit nf_tables_module_exit(void)
10044 {
10045         nfnetlink_subsys_unregister(&nf_tables_subsys);
10046         netlink_unregister_notifier(&nft_nl_notifier);
10047         nft_offload_exit();
10048         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10049         nft_chain_filter_fini();
10050         nft_chain_route_fini();
10051         unregister_pernet_subsys(&nf_tables_net_ops);
10052         cancel_work_sync(&trans_destroy_work);
10053         rcu_barrier();
10054         rhltable_destroy(&nft_objname_ht);
10055         nf_tables_core_module_exit();
10056 }
10057
10058 module_init(nf_tables_module_init);
10059 module_exit(nf_tables_module_exit);
10060
10061 MODULE_LICENSE("GPL");
10062 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10063 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);