net/netfilter/nf_tables_api.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
   4  *
   5  * Development of this code funded by Astaro AG (http://www.astaro.com/)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/list.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/netlink.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/rhashtable.h>
  15 #include <linux/audit.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter/nfnetlink.h>
  18 #include <linux/netfilter/nf_tables.h>
  19 #include <net/netfilter/nf_flow_table.h>
  20 #include <net/netfilter/nf_tables_core.h>
  21 #include <net/netfilter/nf_tables.h>
  22 #include <net/netfilter/nf_tables_offload.h>
  23 #include <net/net_namespace.h>
  24 #include <net/sock.h>
  25
  26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
  27
  28 unsigned int nf_tables_net_id __read_mostly;
  29
  30 static LIST_HEAD(nf_tables_expressions);
  31 static LIST_HEAD(nf_tables_objects);
  32 static LIST_HEAD(nf_tables_flowtables);
  33 static LIST_HEAD(nf_tables_destroy_list);
  34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  35
  36 enum {
  37         NFT_VALIDATE_SKIP       = 0,
  38         NFT_VALIDATE_NEED,
  39         NFT_VALIDATE_DO,
  40 };
  41
  42 static struct rhltable nft_objname_ht;
  43
  44 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  45 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  46 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  47
  48 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  49 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  50 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  51
  52 static const struct rhashtable_params nft_chain_ht_params = {
  53         .head_offset            = offsetof(struct nft_chain, rhlhead),
  54         .key_offset             = offsetof(struct nft_chain, name),
  55         .hashfn                 = nft_chain_hash,
  56         .obj_hashfn             = nft_chain_hash_obj,
  57         .obj_cmpfn              = nft_chain_hash_cmp,
  58         .automatic_shrinking    = true,
  59 };
  60
  61 static const struct rhashtable_params nft_objname_ht_params = {
  62         .head_offset            = offsetof(struct nft_object, rhlhead),
  63         .key_offset             = offsetof(struct nft_object, key),
  64         .hashfn                 = nft_objname_hash,
  65         .obj_hashfn             = nft_objname_hash_obj,
  66         .obj_cmpfn              = nft_objname_hash_cmp,
  67         .automatic_shrinking    = true,
  68 };
  69
  70 struct nft_audit_data {
  71         struct nft_table *table;
  72         int entries;
  73         int op;
  74         struct list_head list;
  75 };
  76
  77 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  78         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  79         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  80         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  81         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  82         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  83         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  84         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  85         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  86         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  87         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  88         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  89         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  90         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  91         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  92         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  93         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  94         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  95         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  96         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
  97         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
  98         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
  99         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 100         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 101         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 102         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 103 };
 104
 105 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
 106 {
 107         struct nftables_pernet *nft_net = nft_pernet(net);
 108
 109         switch (nft_net->validate_state) {
 110         case NFT_VALIDATE_SKIP:
 111                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 112                 break;
 113         case NFT_VALIDATE_NEED:
 114                 break;
 115         case NFT_VALIDATE_DO:
 116                 if (new_validate_state == NFT_VALIDATE_NEED)
 117                         return;
 118         }
 119
 120         nft_net->validate_state = new_validate_state;
 121 }
 122 static void nf_tables_trans_destroy_work(struct work_struct *w);
 123 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 124
 125 static void nft_ctx_init(struct nft_ctx *ctx,
 126                          struct net *net,
 127                          const struct sk_buff *skb,
 128                          const struct nlmsghdr *nlh,
 129                          u8 family,
 130                          struct nft_table *table,
 131                          struct nft_chain *chain,
 132                          const struct nlattr * const *nla)
 133 {
 134         ctx->net        = net;
 135         ctx->family     = family;
 136         ctx->level      = 0;
 137         ctx->table      = table;
 138         ctx->chain      = chain;
 139         ctx->nla        = nla;
 140         ctx->portid     = NETLINK_CB(skb).portid;
 141         ctx->report     = nlmsg_report(nlh);
 142         ctx->flags      = nlh->nlmsg_flags;
 143         ctx->seq        = nlh->nlmsg_seq;
 144 }
 145
 146 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 147                                              int msg_type, u32 size, gfp_t gfp)
 148 {
 149         struct nft_trans *trans;
 150
 151         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 152         if (trans == NULL)
 153                 return NULL;
 154
 155         INIT_LIST_HEAD(&trans->list);
 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         strscpy(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 = READ_ONCE(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 = ++nft_net->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(&cpu_stats->syncp);
1538                         pkts = cpu_stats->pkts;
1539                         bytes = cpu_stats->bytes;
1540                 } while (u64_stats_fetch_retry(&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 = READ_ONCE(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                 list_splice_init(&basechain->hook_list, &hook->list);
2171                 return -EOPNOTSUPP;
2172         }
2173
2174         flow_block_init(&basechain->flow_block);
2175
2176         return 0;
2177 }
2178
2179 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2180 {
2181         int err;
2182
2183         err = rhltable_insert_key(&table->chains_ht, chain->name,
2184                                   &chain->rhlhead, nft_chain_ht_params);
2185         if (err)
2186                 return err;
2187
2188         list_add_tail_rcu(&chain->list, &table->chains);
2189
2190         return 0;
2191 }
2192
2193 static u64 chain_id;
2194
2195 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2196                               u8 policy, u32 flags,
2197                               struct netlink_ext_ack *extack)
2198 {
2199         const struct nlattr * const *nla = ctx->nla;
2200         struct nft_table *table = ctx->table;
2201         struct nft_base_chain *basechain;
2202         struct net *net = ctx->net;
2203         char name[NFT_NAME_MAXLEN];
2204         struct nft_rule_blob *blob;
2205         struct nft_trans *trans;
2206         struct nft_chain *chain;
2207         unsigned int data_size;
2208         int err;
2209
2210         if (table->use == UINT_MAX)
2211                 return -EOVERFLOW;
2212
2213         if (nla[NFTA_CHAIN_HOOK]) {
2214                 struct nft_stats __percpu *stats = NULL;
2215                 struct nft_chain_hook hook;
2216
2217                 if (flags & NFT_CHAIN_BINDING)
2218                         return -EOPNOTSUPP;
2219
2220                 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2221                                            true);
2222                 if (err < 0)
2223                         return err;
2224
2225                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2226                 if (basechain == NULL) {
2227                         nft_chain_release_hook(&hook);
2228                         return -ENOMEM;
2229                 }
2230                 chain = &basechain->chain;
2231
2232                 if (nla[NFTA_CHAIN_COUNTERS]) {
2233                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2234                         if (IS_ERR(stats)) {
2235                                 nft_chain_release_hook(&hook);
2236                                 kfree(basechain);
2237                                 return PTR_ERR(stats);
2238                         }
2239                         rcu_assign_pointer(basechain->stats, stats);
2240                 }
2241
2242                 err = nft_basechain_init(basechain, family, &hook, flags);
2243                 if (err < 0) {
2244                         nft_chain_release_hook(&hook);
2245                         kfree(basechain);
2246                         free_percpu(stats);
2247                         return err;
2248                 }
2249                 if (stats)
2250                         static_branch_inc(&nft_counters_enabled);
2251         } else {
2252                 if (flags & NFT_CHAIN_BASE)
2253                         return -EINVAL;
2254                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2255                         return -EOPNOTSUPP;
2256
2257                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2258                 if (chain == NULL)
2259                         return -ENOMEM;
2260
2261                 chain->flags = flags;
2262         }
2263         ctx->chain = chain;
2264
2265         INIT_LIST_HEAD(&chain->rules);
2266         chain->handle = nf_tables_alloc_handle(table);
2267         chain->table = table;
2268
2269         if (nla[NFTA_CHAIN_NAME]) {
2270                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2271         } else {
2272                 if (!(flags & NFT_CHAIN_BINDING)) {
2273                         err = -EINVAL;
2274                         goto err_destroy_chain;
2275                 }
2276
2277                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2278                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2279         }
2280
2281         if (!chain->name) {
2282                 err = -ENOMEM;
2283                 goto err_destroy_chain;
2284         }
2285
2286         if (nla[NFTA_CHAIN_USERDATA]) {
2287                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2288                 if (chain->udata == NULL) {
2289                         err = -ENOMEM;
2290                         goto err_destroy_chain;
2291                 }
2292                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2293         }
2294
2295         data_size = offsetof(struct nft_rule_dp, data); /* last rule */
2296         blob = nf_tables_chain_alloc_rules(data_size);
2297         if (!blob) {
2298                 err = -ENOMEM;
2299                 goto err_destroy_chain;
2300         }
2301
2302         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2303         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2304
2305         err = nf_tables_register_hook(net, table, chain);
2306         if (err < 0)
2307                 goto err_destroy_chain;
2308
2309         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2310         if (IS_ERR(trans)) {
2311                 err = PTR_ERR(trans);
2312                 goto err_unregister_hook;
2313         }
2314
2315         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2316         if (nft_is_base_chain(chain))
2317                 nft_trans_chain_policy(trans) = policy;
2318
2319         err = nft_chain_add(table, chain);
2320         if (err < 0) {
2321                 nft_trans_destroy(trans);
2322                 goto err_unregister_hook;
2323         }
2324
2325         table->use++;
2326
2327         return 0;
2328 err_unregister_hook:
2329         nf_tables_unregister_hook(net, table, chain);
2330 err_destroy_chain:
2331         nf_tables_chain_destroy(ctx);
2332
2333         return err;
2334 }
2335
2336 static bool nft_hook_list_equal(struct list_head *hook_list1,
2337                                 struct list_head *hook_list2)
2338 {
2339         struct nft_hook *hook;
2340         int n = 0, m = 0;
2341
2342         n = 0;
2343         list_for_each_entry(hook, hook_list2, list) {
2344                 if (!nft_hook_list_find(hook_list1, hook))
2345                         return false;
2346
2347                 n++;
2348         }
2349         list_for_each_entry(hook, hook_list1, list)
2350                 m++;
2351
2352         return n == m;
2353 }
2354
2355 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2356                               u32 flags, const struct nlattr *attr,
2357                               struct netlink_ext_ack *extack)
2358 {
2359         const struct nlattr * const *nla = ctx->nla;
2360         struct nft_table *table = ctx->table;
2361         struct nft_chain *chain = ctx->chain;
2362         struct nft_base_chain *basechain;
2363         struct nft_stats *stats = NULL;
2364         struct nft_chain_hook hook;
2365         struct nf_hook_ops *ops;
2366         struct nft_trans *trans;
2367         int err;
2368
2369         if (chain->flags ^ flags)
2370                 return -EOPNOTSUPP;
2371
2372         if (nla[NFTA_CHAIN_HOOK]) {
2373                 if (!nft_is_base_chain(chain)) {
2374                         NL_SET_BAD_ATTR(extack, attr);
2375                         return -EEXIST;
2376                 }
2377                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2378                                            extack, false);
2379                 if (err < 0)
2380                         return err;
2381
2382                 basechain = nft_base_chain(chain);
2383                 if (basechain->type != hook.type) {
2384                         nft_chain_release_hook(&hook);
2385                         NL_SET_BAD_ATTR(extack, attr);
2386                         return -EEXIST;
2387                 }
2388
2389                 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2390                         if (!nft_hook_list_equal(&basechain->hook_list,
2391                                                  &hook.list)) {
2392                                 nft_chain_release_hook(&hook);
2393                                 NL_SET_BAD_ATTR(extack, attr);
2394                                 return -EEXIST;
2395                         }
2396                 } else {
2397                         ops = &basechain->ops;
2398                         if (ops->hooknum != hook.num ||
2399                             ops->priority != hook.priority) {
2400                                 nft_chain_release_hook(&hook);
2401                                 NL_SET_BAD_ATTR(extack, attr);
2402                                 return -EEXIST;
2403                         }
2404                 }
2405                 nft_chain_release_hook(&hook);
2406         }
2407
2408         if (nla[NFTA_CHAIN_HANDLE] &&
2409             nla[NFTA_CHAIN_NAME]) {
2410                 struct nft_chain *chain2;
2411
2412                 chain2 = nft_chain_lookup(ctx->net, table,
2413                                           nla[NFTA_CHAIN_NAME], genmask);
2414                 if (!IS_ERR(chain2)) {
2415                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2416                         return -EEXIST;
2417                 }
2418         }
2419
2420         if (nla[NFTA_CHAIN_COUNTERS]) {
2421                 if (!nft_is_base_chain(chain))
2422                         return -EOPNOTSUPP;
2423
2424                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2425                 if (IS_ERR(stats))
2426                         return PTR_ERR(stats);
2427         }
2428
2429         err = -ENOMEM;
2430         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2431                                 sizeof(struct nft_trans_chain));
2432         if (trans == NULL)
2433                 goto err;
2434
2435         nft_trans_chain_stats(trans) = stats;
2436         nft_trans_chain_update(trans) = true;
2437
2438         if (nla[NFTA_CHAIN_POLICY])
2439                 nft_trans_chain_policy(trans) = policy;
2440         else
2441                 nft_trans_chain_policy(trans) = -1;
2442
2443         if (nla[NFTA_CHAIN_HANDLE] &&
2444             nla[NFTA_CHAIN_NAME]) {
2445                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2446                 struct nft_trans *tmp;
2447                 char *name;
2448
2449                 err = -ENOMEM;
2450                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2451                 if (!name)
2452                         goto err;
2453
2454                 err = -EEXIST;
2455                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2456                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2457                             tmp->ctx.table == table &&
2458                             nft_trans_chain_update(tmp) &&
2459                             nft_trans_chain_name(tmp) &&
2460                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2461                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2462                                 kfree(name);
2463                                 goto err;
2464                         }
2465                 }
2466
2467                 nft_trans_chain_name(trans) = name;
2468         }
2469         nft_trans_commit_list_add_tail(ctx->net, trans);
2470
2471         return 0;
2472 err:
2473         free_percpu(stats);
2474         kfree(trans);
2475         return err;
2476 }
2477
2478 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2479                                                const struct nft_table *table,
2480                                                const struct nlattr *nla)
2481 {
2482         struct nftables_pernet *nft_net = nft_pernet(net);
2483         u32 id = ntohl(nla_get_be32(nla));
2484         struct nft_trans *trans;
2485
2486         list_for_each_entry(trans, &nft_net->commit_list, list) {
2487                 struct nft_chain *chain = trans->ctx.chain;
2488
2489                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2490                     chain->table == table &&
2491                     id == nft_trans_chain_id(trans))
2492                         return chain;
2493         }
2494         return ERR_PTR(-ENOENT);
2495 }
2496
2497 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2498                               const struct nlattr * const nla[])
2499 {
2500         struct nftables_pernet *nft_net = nft_pernet(info->net);
2501         struct netlink_ext_ack *extack = info->extack;
2502         u8 genmask = nft_genmask_next(info->net);
2503         u8 family = info->nfmsg->nfgen_family;
2504         struct nft_chain *chain = NULL;
2505         struct net *net = info->net;
2506         const struct nlattr *attr;
2507         struct nft_table *table;
2508         u8 policy = NF_ACCEPT;
2509         struct nft_ctx ctx;
2510         u64 handle = 0;
2511         u32 flags = 0;
2512
2513         lockdep_assert_held(&nft_net->commit_mutex);
2514
2515         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2516                                  NETLINK_CB(skb).portid);
2517         if (IS_ERR(table)) {
2518                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2519                 return PTR_ERR(table);
2520         }
2521
2522         chain = NULL;
2523         attr = nla[NFTA_CHAIN_NAME];
2524
2525         if (nla[NFTA_CHAIN_HANDLE]) {
2526                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2527                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2528                 if (IS_ERR(chain)) {
2529                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2530                         return PTR_ERR(chain);
2531                 }
2532                 attr = nla[NFTA_CHAIN_HANDLE];
2533         } else if (nla[NFTA_CHAIN_NAME]) {
2534                 chain = nft_chain_lookup(net, table, attr, genmask);
2535                 if (IS_ERR(chain)) {
2536                         if (PTR_ERR(chain) != -ENOENT) {
2537                                 NL_SET_BAD_ATTR(extack, attr);
2538                                 return PTR_ERR(chain);
2539                         }
2540                         chain = NULL;
2541                 }
2542         } else if (!nla[NFTA_CHAIN_ID]) {
2543                 return -EINVAL;
2544         }
2545
2546         if (nla[NFTA_CHAIN_POLICY]) {
2547                 if (chain != NULL &&
2548                     !nft_is_base_chain(chain)) {
2549                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2550                         return -EOPNOTSUPP;
2551                 }
2552
2553                 if (chain == NULL &&
2554                     nla[NFTA_CHAIN_HOOK] == NULL) {
2555                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2556                         return -EOPNOTSUPP;
2557                 }
2558
2559                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2560                 switch (policy) {
2561                 case NF_DROP:
2562                 case NF_ACCEPT:
2563                         break;
2564                 default:
2565                         return -EINVAL;
2566                 }
2567         }
2568
2569         if (nla[NFTA_CHAIN_FLAGS])
2570                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2571         else if (chain)
2572                 flags = chain->flags;
2573
2574         if (flags & ~NFT_CHAIN_FLAGS)
2575                 return -EOPNOTSUPP;
2576
2577         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2578
2579         if (chain != NULL) {
2580                 if (chain->flags & NFT_CHAIN_BINDING)
2581                         return -EINVAL;
2582
2583                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2584                         NL_SET_BAD_ATTR(extack, attr);
2585                         return -EEXIST;
2586                 }
2587                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2588                         return -EOPNOTSUPP;
2589
2590                 flags |= chain->flags & NFT_CHAIN_BASE;
2591                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2592                                           extack);
2593         }
2594
2595         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2596 }
2597
2598 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2599                               const struct nlattr * const nla[])
2600 {
2601         struct netlink_ext_ack *extack = info->extack;
2602         u8 genmask = nft_genmask_next(info->net);
2603         u8 family = info->nfmsg->nfgen_family;
2604         struct net *net = info->net;
2605         const struct nlattr *attr;
2606         struct nft_table *table;
2607         struct nft_chain *chain;
2608         struct nft_rule *rule;
2609         struct nft_ctx ctx;
2610         u64 handle;
2611         u32 use;
2612         int err;
2613
2614         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2615                                  NETLINK_CB(skb).portid);
2616         if (IS_ERR(table)) {
2617                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2618                 return PTR_ERR(table);
2619         }
2620
2621         if (nla[NFTA_CHAIN_HANDLE]) {
2622                 attr = nla[NFTA_CHAIN_HANDLE];
2623                 handle = be64_to_cpu(nla_get_be64(attr));
2624                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2625         } else {
2626                 attr = nla[NFTA_CHAIN_NAME];
2627                 chain = nft_chain_lookup(net, table, attr, genmask);
2628         }
2629         if (IS_ERR(chain)) {
2630                 NL_SET_BAD_ATTR(extack, attr);
2631                 return PTR_ERR(chain);
2632         }
2633
2634         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2635             chain->use > 0)
2636                 return -EBUSY;
2637
2638         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2639
2640         use = chain->use;
2641         list_for_each_entry(rule, &chain->rules, list) {
2642                 if (!nft_is_active_next(net, rule))
2643                         continue;
2644                 use--;
2645
2646                 err = nft_delrule(&ctx, rule);
2647                 if (err < 0)
2648                         return err;
2649         }
2650
2651         /* There are rules and elements that are still holding references to us,
2652          * we cannot do a recursive removal in this case.
2653          */
2654         if (use > 0) {
2655                 NL_SET_BAD_ATTR(extack, attr);
2656                 return -EBUSY;
2657         }
2658
2659         return nft_delchain(&ctx);
2660 }
2661
2662 /*
2663  * Expressions
2664  */
2665
2666 /**
2667  *      nft_register_expr - register nf_tables expr type
2668  *      @type: expr type
2669  *
2670  *      Registers the expr type for use with nf_tables. Returns zero on
2671  *      success or a negative errno code otherwise.
2672  */
2673 int nft_register_expr(struct nft_expr_type *type)
2674 {
2675         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2676         if (type->family == NFPROTO_UNSPEC)
2677                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2678         else
2679                 list_add_rcu(&type->list, &nf_tables_expressions);
2680         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2681         return 0;
2682 }
2683 EXPORT_SYMBOL_GPL(nft_register_expr);
2684
2685 /**
2686  *      nft_unregister_expr - unregister nf_tables expr type
2687  *      @type: expr type
2688  *
2689  *      Unregisters the expr typefor use with nf_tables.
2690  */
2691 void nft_unregister_expr(struct nft_expr_type *type)
2692 {
2693         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2694         list_del_rcu(&type->list);
2695         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2696 }
2697 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2698
2699 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2700                                                        struct nlattr *nla)
2701 {
2702         const struct nft_expr_type *type, *candidate = NULL;
2703
2704         list_for_each_entry(type, &nf_tables_expressions, list) {
2705                 if (!nla_strcmp(nla, type->name)) {
2706                         if (!type->family && !candidate)
2707                                 candidate = type;
2708                         else if (type->family == family)
2709                                 candidate = type;
2710                 }
2711         }
2712         return candidate;
2713 }
2714
2715 #ifdef CONFIG_MODULES
2716 static int nft_expr_type_request_module(struct net *net, u8 family,
2717                                         struct nlattr *nla)
2718 {
2719         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2720                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2721                 return -EAGAIN;
2722
2723         return 0;
2724 }
2725 #endif
2726
2727 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2728                                                      u8 family,
2729                                                      struct nlattr *nla)
2730 {
2731         const struct nft_expr_type *type;
2732
2733         if (nla == NULL)
2734                 return ERR_PTR(-EINVAL);
2735
2736         type = __nft_expr_type_get(family, nla);
2737         if (type != NULL && try_module_get(type->owner))
2738                 return type;
2739
2740         lockdep_nfnl_nft_mutex_not_held();
2741 #ifdef CONFIG_MODULES
2742         if (type == NULL) {
2743                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2744                         return ERR_PTR(-EAGAIN);
2745
2746                 if (nft_request_module(net, "nft-expr-%.*s",
2747                                        nla_len(nla),
2748                                        (char *)nla_data(nla)) == -EAGAIN)
2749                         return ERR_PTR(-EAGAIN);
2750         }
2751 #endif
2752         return ERR_PTR(-ENOENT);
2753 }
2754
2755 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2756         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2757                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2758         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2759 };
2760
2761 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2762                                     const struct nft_expr *expr, bool reset)
2763 {
2764         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2765                 goto nla_put_failure;
2766
2767         if (expr->ops->dump) {
2768                 struct nlattr *data = nla_nest_start_noflag(skb,
2769                                                             NFTA_EXPR_DATA);
2770                 if (data == NULL)
2771                         goto nla_put_failure;
2772                 if (expr->ops->dump(skb, expr, reset) < 0)
2773                         goto nla_put_failure;
2774                 nla_nest_end(skb, data);
2775         }
2776
2777         return skb->len;
2778
2779 nla_put_failure:
2780         return -1;
2781 };
2782
2783 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2784                   const struct nft_expr *expr, bool reset)
2785 {
2786         struct nlattr *nest;
2787
2788         nest = nla_nest_start_noflag(skb, attr);
2789         if (!nest)
2790                 goto nla_put_failure;
2791         if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
2792                 goto nla_put_failure;
2793         nla_nest_end(skb, nest);
2794         return 0;
2795
2796 nla_put_failure:
2797         return -1;
2798 }
2799
2800 struct nft_expr_info {
2801         const struct nft_expr_ops       *ops;
2802         const struct nlattr             *attr;
2803         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2804 };
2805
2806 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2807                                 const struct nlattr *nla,
2808                                 struct nft_expr_info *info)
2809 {
2810         const struct nft_expr_type *type;
2811         const struct nft_expr_ops *ops;
2812         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2813         int err;
2814
2815         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2816                                           nft_expr_policy, NULL);
2817         if (err < 0)
2818                 return err;
2819
2820         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2821         if (IS_ERR(type))
2822                 return PTR_ERR(type);
2823
2824         if (tb[NFTA_EXPR_DATA]) {
2825                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2826                                                   tb[NFTA_EXPR_DATA],
2827                                                   type->policy, NULL);
2828                 if (err < 0)
2829                         goto err1;
2830         } else
2831                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2832
2833         if (type->select_ops != NULL) {
2834                 ops = type->select_ops(ctx,
2835                                        (const struct nlattr * const *)info->tb);
2836                 if (IS_ERR(ops)) {
2837                         err = PTR_ERR(ops);
2838 #ifdef CONFIG_MODULES
2839                         if (err == -EAGAIN)
2840                                 if (nft_expr_type_request_module(ctx->net,
2841                                                                  ctx->family,
2842                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2843                                         err = -ENOENT;
2844 #endif
2845                         goto err1;
2846                 }
2847         } else
2848                 ops = type->ops;
2849
2850         info->attr = nla;
2851         info->ops = ops;
2852
2853         return 0;
2854
2855 err1:
2856         module_put(type->owner);
2857         return err;
2858 }
2859
2860 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
2861                          struct nft_expr_info *info)
2862 {
2863         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2864         const struct nft_expr_type *type;
2865         int err;
2866
2867         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2868                                           nft_expr_policy, NULL);
2869         if (err < 0)
2870                 return err;
2871
2872         if (!tb[NFTA_EXPR_DATA])
2873                 return -EINVAL;
2874
2875         type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
2876         if (!type)
2877                 return -ENOENT;
2878
2879         if (!type->inner_ops)
2880                 return -EOPNOTSUPP;
2881
2882         err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2883                                           tb[NFTA_EXPR_DATA],
2884                                           type->policy, NULL);
2885         if (err < 0)
2886                 goto err_nla_parse;
2887
2888         info->attr = nla;
2889         info->ops = type->inner_ops;
2890
2891         return 0;
2892
2893 err_nla_parse:
2894         return err;
2895 }
2896
2897 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2898                              const struct nft_expr_info *expr_info,
2899                              struct nft_expr *expr)
2900 {
2901         const struct nft_expr_ops *ops = expr_info->ops;
2902         int err;
2903
2904         expr->ops = ops;
2905         if (ops->init) {
2906                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2907                 if (err < 0)
2908                         goto err1;
2909         }
2910
2911         return 0;
2912 err1:
2913         expr->ops = NULL;
2914         return err;
2915 }
2916
2917 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2918                                    struct nft_expr *expr)
2919 {
2920         const struct nft_expr_type *type = expr->ops->type;
2921
2922         if (expr->ops->destroy)
2923                 expr->ops->destroy(ctx, expr);
2924         module_put(type->owner);
2925 }
2926
2927 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2928                                       const struct nlattr *nla)
2929 {
2930         struct nft_expr_info expr_info;
2931         struct nft_expr *expr;
2932         struct module *owner;
2933         int err;
2934
2935         err = nf_tables_expr_parse(ctx, nla, &expr_info);
2936         if (err < 0)
2937                 goto err_expr_parse;
2938
2939         err = -EOPNOTSUPP;
2940         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
2941                 goto err_expr_stateful;
2942
2943         err = -ENOMEM;
2944         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
2945         if (expr == NULL)
2946                 goto err_expr_stateful;
2947
2948         err = nf_tables_newexpr(ctx, &expr_info, expr);
2949         if (err < 0)
2950                 goto err_expr_new;
2951
2952         return expr;
2953 err_expr_new:
2954         kfree(expr);
2955 err_expr_stateful:
2956         owner = expr_info.ops->type->owner;
2957         if (expr_info.ops->type->release_ops)
2958                 expr_info.ops->type->release_ops(expr_info.ops);
2959
2960         module_put(owner);
2961 err_expr_parse:
2962         return ERR_PTR(err);
2963 }
2964
2965 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2966 {
2967         int err;
2968
2969         if (src->ops->clone) {
2970                 dst->ops = src->ops;
2971                 err = src->ops->clone(dst, src);
2972                 if (err < 0)
2973                         return err;
2974         } else {
2975                 memcpy(dst, src, src->ops->size);
2976         }
2977
2978         __module_get(src->ops->type->owner);
2979
2980         return 0;
2981 }
2982
2983 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2984 {
2985         nf_tables_expr_destroy(ctx, expr);
2986         kfree(expr);
2987 }
2988
2989 /*
2990  * Rules
2991  */
2992
2993 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2994                                           u64 handle)
2995 {
2996         struct nft_rule *rule;
2997
2998         // FIXME: this sucks
2999         list_for_each_entry_rcu(rule, &chain->rules, list) {
3000                 if (handle == rule->handle)
3001                         return rule;
3002         }
3003
3004         return ERR_PTR(-ENOENT);
3005 }
3006
3007 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3008                                         const struct nlattr *nla)
3009 {
3010         if (nla == NULL)
3011                 return ERR_PTR(-EINVAL);
3012
3013         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3014 }
3015
3016 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3017         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
3018                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
3019         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
3020                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
3021         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
3022         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3023         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
3024         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
3025         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
3026                                     .len = NFT_USERDATA_MAXLEN },
3027         [NFTA_RULE_ID]          = { .type = NLA_U32 },
3028         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3029         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
3030 };
3031
3032 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3033                                     u32 portid, u32 seq, int event,
3034                                     u32 flags, int family,
3035                                     const struct nft_table *table,
3036                                     const struct nft_chain *chain,
3037                                     const struct nft_rule *rule, u64 handle,
3038                                     bool reset)
3039 {
3040         struct nlmsghdr *nlh;
3041         const struct nft_expr *expr, *next;
3042         struct nlattr *list;
3043         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3044
3045         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3046                            nft_base_seq(net));
3047         if (!nlh)
3048                 goto nla_put_failure;
3049
3050         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3051                 goto nla_put_failure;
3052         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3053                 goto nla_put_failure;
3054         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3055                          NFTA_RULE_PAD))
3056                 goto nla_put_failure;
3057
3058         if (event != NFT_MSG_DELRULE && handle) {
3059                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3060                                  NFTA_RULE_PAD))
3061                         goto nla_put_failure;
3062         }
3063
3064         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3065                 nft_flow_rule_stats(chain, rule);
3066
3067         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3068         if (list == NULL)
3069                 goto nla_put_failure;
3070         nft_rule_for_each_expr(expr, next, rule) {
3071                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3072                         goto nla_put_failure;
3073         }
3074         nla_nest_end(skb, list);
3075
3076         if (rule->udata) {
3077                 struct nft_userdata *udata = nft_userdata(rule);
3078                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3079                             udata->data) < 0)
3080                         goto nla_put_failure;
3081         }
3082
3083         nlmsg_end(skb, nlh);
3084         return 0;
3085
3086 nla_put_failure:
3087         nlmsg_trim(skb, nlh);
3088         return -1;
3089 }
3090
3091 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3092                                   const struct nft_rule *rule, int event)
3093 {
3094         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3095         const struct nft_rule *prule;
3096         struct sk_buff *skb;
3097         u64 handle = 0;
3098         u16 flags = 0;
3099         int err;
3100
3101         if (!ctx->report &&
3102             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3103                 return;
3104
3105         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3106         if (skb == NULL)
3107                 goto err;
3108
3109         if (event == NFT_MSG_NEWRULE &&
3110             !list_is_first(&rule->list, &ctx->chain->rules) &&
3111             !list_is_last(&rule->list, &ctx->chain->rules)) {
3112                 prule = list_prev_entry(rule, list);
3113                 handle = prule->handle;
3114         }
3115         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3116                 flags |= NLM_F_APPEND;
3117         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3118                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3119
3120         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3121                                        event, flags, ctx->family, ctx->table,
3122                                        ctx->chain, rule, handle, false);
3123         if (err < 0) {
3124                 kfree_skb(skb);
3125                 goto err;
3126         }
3127
3128         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3129         return;
3130 err:
3131         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3132 }
3133
3134 struct nft_rule_dump_ctx {
3135         char *table;
3136         char *chain;
3137 };
3138
3139 static int __nf_tables_dump_rules(struct sk_buff *skb,
3140                                   unsigned int *idx,
3141                                   struct netlink_callback *cb,
3142                                   const struct nft_table *table,
3143                                   const struct nft_chain *chain,
3144                                   bool reset)
3145 {
3146         struct net *net = sock_net(skb->sk);
3147         const struct nft_rule *rule, *prule;
3148         unsigned int s_idx = cb->args[0];
3149         u64 handle;
3150
3151         prule = NULL;
3152         list_for_each_entry_rcu(rule, &chain->rules, list) {
3153                 if (!nft_is_active(net, rule))
3154                         goto cont_skip;
3155                 if (*idx < s_idx)
3156                         goto cont;
3157                 if (*idx > s_idx) {
3158                         memset(&cb->args[1], 0,
3159                                         sizeof(cb->args) - sizeof(cb->args[0]));
3160                 }
3161                 if (prule)
3162                         handle = prule->handle;
3163                 else
3164                         handle = 0;
3165
3166                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3167                                         cb->nlh->nlmsg_seq,
3168                                         NFT_MSG_NEWRULE,
3169                                         NLM_F_MULTI | NLM_F_APPEND,
3170                                         table->family,
3171                                         table, chain, rule, handle, reset) < 0)
3172                         return 1;
3173
3174                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3175 cont:
3176                 prule = rule;
3177 cont_skip:
3178                 (*idx)++;
3179         }
3180         return 0;
3181 }
3182
3183 static int nf_tables_dump_rules(struct sk_buff *skb,
3184                                 struct netlink_callback *cb)
3185 {
3186         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3187         const struct nft_rule_dump_ctx *ctx = cb->data;
3188         struct nft_table *table;
3189         const struct nft_chain *chain;
3190         unsigned int idx = 0;
3191         struct net *net = sock_net(skb->sk);
3192         int family = nfmsg->nfgen_family;
3193         struct nftables_pernet *nft_net;
3194         bool reset = false;
3195
3196         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3197                 reset = true;
3198
3199         rcu_read_lock();
3200         nft_net = nft_pernet(net);
3201         cb->seq = READ_ONCE(nft_net->base_seq);
3202
3203         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3204                 if (family != NFPROTO_UNSPEC && family != table->family)
3205                         continue;
3206
3207                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3208                         continue;
3209
3210                 if (ctx && ctx->table && ctx->chain) {
3211                         struct rhlist_head *list, *tmp;
3212
3213                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3214                                                nft_chain_ht_params);
3215                         if (!list)
3216                                 goto done;
3217
3218                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3219                                 if (!nft_is_active(net, chain))
3220                                         continue;
3221                                 __nf_tables_dump_rules(skb, &idx,
3222                                                        cb, table, chain, reset);
3223                                 break;
3224                         }
3225                         goto done;
3226                 }
3227
3228                 list_for_each_entry_rcu(chain, &table->chains, list) {
3229                         if (__nf_tables_dump_rules(skb, &idx,
3230                                                    cb, table, chain, reset))
3231                                 goto done;
3232                 }
3233
3234                 if (ctx && ctx->table)
3235                         break;
3236         }
3237 done:
3238         rcu_read_unlock();
3239
3240         cb->args[0] = idx;
3241         return skb->len;
3242 }
3243
3244 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3245 {
3246         const struct nlattr * const *nla = cb->data;
3247         struct nft_rule_dump_ctx *ctx = NULL;
3248
3249         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3250                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3251                 if (!ctx)
3252                         return -ENOMEM;
3253
3254                 if (nla[NFTA_RULE_TABLE]) {
3255                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3256                                                         GFP_ATOMIC);
3257                         if (!ctx->table) {
3258                                 kfree(ctx);
3259                                 return -ENOMEM;
3260                         }
3261                 }
3262                 if (nla[NFTA_RULE_CHAIN]) {
3263                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3264                                                 GFP_ATOMIC);
3265                         if (!ctx->chain) {
3266                                 kfree(ctx->table);
3267                                 kfree(ctx);
3268                                 return -ENOMEM;
3269                         }
3270                 }
3271         }
3272
3273         cb->data = ctx;
3274         return 0;
3275 }
3276
3277 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3278 {
3279         struct nft_rule_dump_ctx *ctx = cb->data;
3280
3281         if (ctx) {
3282                 kfree(ctx->table);
3283                 kfree(ctx->chain);
3284                 kfree(ctx);
3285         }
3286         return 0;
3287 }
3288
3289 /* called with rcu_read_lock held */
3290 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3291                              const struct nlattr * const nla[])
3292 {
3293         struct netlink_ext_ack *extack = info->extack;
3294         u8 genmask = nft_genmask_cur(info->net);
3295         u8 family = info->nfmsg->nfgen_family;
3296         const struct nft_chain *chain;
3297         const struct nft_rule *rule;
3298         struct net *net = info->net;
3299         struct nft_table *table;
3300         struct sk_buff *skb2;
3301         bool reset = false;
3302         int err;
3303
3304         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3305                 struct netlink_dump_control c = {
3306                         .start= nf_tables_dump_rules_start,
3307                         .dump = nf_tables_dump_rules,
3308                         .done = nf_tables_dump_rules_done,
3309                         .module = THIS_MODULE,
3310                         .data = (void *)nla,
3311                 };
3312
3313                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3314         }
3315
3316         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3317         if (IS_ERR(table)) {
3318                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3319                 return PTR_ERR(table);
3320         }
3321
3322         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3323         if (IS_ERR(chain)) {
3324                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3325                 return PTR_ERR(chain);
3326         }
3327
3328         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3329         if (IS_ERR(rule)) {
3330                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3331                 return PTR_ERR(rule);
3332         }
3333
3334         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3335         if (!skb2)
3336                 return -ENOMEM;
3337
3338         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3339                 reset = true;
3340
3341         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3342                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3343                                        family, table, chain, rule, 0, reset);
3344         if (err < 0)
3345                 goto err_fill_rule_info;
3346
3347         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3348
3349 err_fill_rule_info:
3350         kfree_skb(skb2);
3351         return err;
3352 }
3353
3354 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3355                                    struct nft_rule *rule)
3356 {
3357         struct nft_expr *expr, *next;
3358
3359         /*
3360          * Careful: some expressions might not be initialized in case this
3361          * is called on error from nf_tables_newrule().
3362          */
3363         expr = nft_expr_first(rule);
3364         while (nft_expr_more(rule, expr)) {
3365                 next = nft_expr_next(expr);
3366                 nf_tables_expr_destroy(ctx, expr);
3367                 expr = next;
3368         }
3369         kfree(rule);
3370 }
3371
3372 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3373 {
3374         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3375         nf_tables_rule_destroy(ctx, rule);
3376 }
3377
3378 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3379 {
3380         struct nft_expr *expr, *last;
3381         const struct nft_data *data;
3382         struct nft_rule *rule;
3383         int err;
3384
3385         if (ctx->level == NFT_JUMP_STACK_SIZE)
3386                 return -EMLINK;
3387
3388         list_for_each_entry(rule, &chain->rules, list) {
3389                 if (!nft_is_active_next(ctx->net, rule))
3390                         continue;
3391
3392                 nft_rule_for_each_expr(expr, last, rule) {
3393                         if (!expr->ops->validate)
3394                                 continue;
3395
3396                         err = expr->ops->validate(ctx, expr, &data);
3397                         if (err < 0)
3398                                 return err;
3399                 }
3400
3401                 cond_resched();
3402         }
3403
3404         return 0;
3405 }
3406 EXPORT_SYMBOL_GPL(nft_chain_validate);
3407
3408 static int nft_table_validate(struct net *net, const struct nft_table *table)
3409 {
3410         struct nft_chain *chain;
3411         struct nft_ctx ctx = {
3412                 .net    = net,
3413                 .family = table->family,
3414         };
3415         int err;
3416
3417         list_for_each_entry(chain, &table->chains, list) {
3418                 if (!nft_is_base_chain(chain))
3419                         continue;
3420
3421                 ctx.chain = chain;
3422                 err = nft_chain_validate(&ctx, chain);
3423                 if (err < 0)
3424                         return err;
3425         }
3426
3427         return 0;
3428 }
3429
3430 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3431                                              const struct nft_chain *chain,
3432                                              const struct nlattr *nla);
3433
3434 #define NFT_RULE_MAXEXPRS       128
3435
3436 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3437                              const struct nlattr * const nla[])
3438 {
3439         struct nftables_pernet *nft_net = nft_pernet(info->net);
3440         struct netlink_ext_ack *extack = info->extack;
3441         unsigned int size, i, n, ulen = 0, usize = 0;
3442         u8 genmask = nft_genmask_next(info->net);
3443         struct nft_rule *rule, *old_rule = NULL;
3444         struct nft_expr_info *expr_info = NULL;
3445         u8 family = info->nfmsg->nfgen_family;
3446         struct nft_flow_rule *flow = NULL;
3447         struct net *net = info->net;
3448         struct nft_userdata *udata;
3449         struct nft_table *table;
3450         struct nft_chain *chain;
3451         struct nft_trans *trans;
3452         u64 handle, pos_handle;
3453         struct nft_expr *expr;
3454         struct nft_ctx ctx;
3455         struct nlattr *tmp;
3456         int err, rem;
3457
3458         lockdep_assert_held(&nft_net->commit_mutex);
3459
3460         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3461                                  NETLINK_CB(skb).portid);
3462         if (IS_ERR(table)) {
3463                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3464                 return PTR_ERR(table);
3465         }
3466
3467         if (nla[NFTA_RULE_CHAIN]) {
3468                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3469                                          genmask);
3470                 if (IS_ERR(chain)) {
3471                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3472                         return PTR_ERR(chain);
3473                 }
3474                 if (nft_chain_is_bound(chain))
3475                         return -EOPNOTSUPP;
3476
3477         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3478                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
3479                 if (IS_ERR(chain)) {
3480                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3481                         return PTR_ERR(chain);
3482                 }
3483         } else {
3484                 return -EINVAL;
3485         }
3486
3487         if (nla[NFTA_RULE_HANDLE]) {
3488                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3489                 rule = __nft_rule_lookup(chain, handle);
3490                 if (IS_ERR(rule)) {
3491                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3492                         return PTR_ERR(rule);
3493                 }
3494
3495                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3496                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3497                         return -EEXIST;
3498                 }
3499                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3500                         old_rule = rule;
3501                 else
3502                         return -EOPNOTSUPP;
3503         } else {
3504                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3505                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3506                         return -EINVAL;
3507                 handle = nf_tables_alloc_handle(table);
3508
3509                 if (chain->use == UINT_MAX)
3510                         return -EOVERFLOW;
3511
3512                 if (nla[NFTA_RULE_POSITION]) {
3513                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3514                         old_rule = __nft_rule_lookup(chain, pos_handle);
3515                         if (IS_ERR(old_rule)) {
3516                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3517                                 return PTR_ERR(old_rule);
3518                         }
3519                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3520                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3521                         if (IS_ERR(old_rule)) {
3522                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3523                                 return PTR_ERR(old_rule);
3524                         }
3525                 }
3526         }
3527
3528         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3529
3530         n = 0;
3531         size = 0;
3532         if (nla[NFTA_RULE_EXPRESSIONS]) {
3533                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3534                                            sizeof(struct nft_expr_info),
3535                                            GFP_KERNEL);
3536                 if (!expr_info)
3537                         return -ENOMEM;
3538
3539                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3540                         err = -EINVAL;
3541                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3542                                 goto err_release_expr;
3543                         if (n == NFT_RULE_MAXEXPRS)
3544                                 goto err_release_expr;
3545                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3546                         if (err < 0) {
3547                                 NL_SET_BAD_ATTR(extack, tmp);
3548                                 goto err_release_expr;
3549                         }
3550                         size += expr_info[n].ops->size;
3551                         n++;
3552                 }
3553         }
3554         /* Check for overflow of dlen field */
3555         err = -EFBIG;
3556         if (size >= 1 << 12)
3557                 goto err_release_expr;
3558
3559         if (nla[NFTA_RULE_USERDATA]) {
3560                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3561                 if (ulen > 0)
3562                         usize = sizeof(struct nft_userdata) + ulen;
3563         }
3564
3565         err = -ENOMEM;
3566         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3567         if (rule == NULL)
3568                 goto err_release_expr;
3569
3570         nft_activate_next(net, rule);
3571
3572         rule->handle = handle;
3573         rule->dlen   = size;
3574         rule->udata  = ulen ? 1 : 0;
3575
3576         if (ulen) {
3577                 udata = nft_userdata(rule);
3578                 udata->len = ulen - 1;
3579                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3580         }
3581
3582         expr = nft_expr_first(rule);
3583         for (i = 0; i < n; i++) {
3584                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3585                 if (err < 0) {
3586                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3587                         goto err_release_rule;
3588                 }
3589
3590                 if (expr_info[i].ops->validate)
3591                         nft_validate_state_update(net, NFT_VALIDATE_NEED);
3592
3593                 expr_info[i].ops = NULL;
3594                 expr = nft_expr_next(expr);
3595         }
3596
3597         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3598                 flow = nft_flow_rule_create(net, rule);
3599                 if (IS_ERR(flow)) {
3600                         err = PTR_ERR(flow);
3601                         goto err_release_rule;
3602                 }
3603         }
3604
3605         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3606                 err = nft_delrule(&ctx, old_rule);
3607                 if (err < 0)
3608                         goto err_destroy_flow_rule;
3609
3610                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3611                 if (trans == NULL) {
3612                         err = -ENOMEM;
3613                         goto err_destroy_flow_rule;
3614                 }
3615                 list_add_tail_rcu(&rule->list, &old_rule->list);
3616         } else {
3617                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3618                 if (!trans) {
3619                         err = -ENOMEM;
3620                         goto err_destroy_flow_rule;
3621                 }
3622
3623                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3624                         if (old_rule)
3625                                 list_add_rcu(&rule->list, &old_rule->list);
3626                         else
3627                                 list_add_tail_rcu(&rule->list, &chain->rules);
3628                  } else {
3629                         if (old_rule)
3630                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3631                         else
3632                                 list_add_rcu(&rule->list, &chain->rules);
3633                 }
3634         }
3635         kvfree(expr_info);
3636         chain->use++;
3637
3638         if (flow)
3639                 nft_trans_flow_rule(trans) = flow;
3640
3641         if (nft_net->validate_state == NFT_VALIDATE_DO)
3642                 return nft_table_validate(net, table);
3643
3644         return 0;
3645
3646 err_destroy_flow_rule:
3647         if (flow)
3648                 nft_flow_rule_destroy(flow);
3649 err_release_rule:
3650         nf_tables_rule_release(&ctx, rule);
3651 err_release_expr:
3652         for (i = 0; i < n; i++) {
3653                 if (expr_info[i].ops) {
3654                         module_put(expr_info[i].ops->type->owner);
3655                         if (expr_info[i].ops->type->release_ops)
3656                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3657                 }
3658         }
3659         kvfree(expr_info);
3660
3661         return err;
3662 }
3663
3664 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3665                                              const struct nft_chain *chain,
3666                                              const struct nlattr *nla)
3667 {
3668         struct nftables_pernet *nft_net = nft_pernet(net);
3669         u32 id = ntohl(nla_get_be32(nla));
3670         struct nft_trans *trans;
3671
3672         list_for_each_entry(trans, &nft_net->commit_list, list) {
3673                 struct nft_rule *rule = nft_trans_rule(trans);
3674
3675                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3676                     trans->ctx.chain == chain &&
3677                     id == nft_trans_rule_id(trans))
3678                         return rule;
3679         }
3680         return ERR_PTR(-ENOENT);
3681 }
3682
3683 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3684                              const struct nlattr * const nla[])
3685 {
3686         struct netlink_ext_ack *extack = info->extack;
3687         u8 genmask = nft_genmask_next(info->net);
3688         u8 family = info->nfmsg->nfgen_family;
3689         struct nft_chain *chain = NULL;
3690         struct net *net = info->net;
3691         struct nft_table *table;
3692         struct nft_rule *rule;
3693         struct nft_ctx ctx;
3694         int err = 0;
3695
3696         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3697                                  NETLINK_CB(skb).portid);
3698         if (IS_ERR(table)) {
3699                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3700                 return PTR_ERR(table);
3701         }
3702
3703         if (nla[NFTA_RULE_CHAIN]) {
3704                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3705                                          genmask);
3706                 if (IS_ERR(chain)) {
3707                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3708                         return PTR_ERR(chain);
3709                 }
3710                 if (nft_chain_is_bound(chain))
3711                         return -EOPNOTSUPP;
3712         }
3713
3714         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3715
3716         if (chain) {
3717                 if (nla[NFTA_RULE_HANDLE]) {
3718                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3719                         if (IS_ERR(rule)) {
3720                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3721                                 return PTR_ERR(rule);
3722                         }
3723
3724                         err = nft_delrule(&ctx, rule);
3725                 } else if (nla[NFTA_RULE_ID]) {
3726                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
3727                         if (IS_ERR(rule)) {
3728                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3729                                 return PTR_ERR(rule);
3730                         }
3731
3732                         err = nft_delrule(&ctx, rule);
3733                 } else {
3734                         err = nft_delrule_by_chain(&ctx);
3735                 }
3736         } else {
3737                 list_for_each_entry(chain, &table->chains, list) {
3738                         if (!nft_is_active_next(net, chain))
3739                                 continue;
3740
3741                         ctx.chain = chain;
3742                         err = nft_delrule_by_chain(&ctx);
3743                         if (err < 0)
3744                                 break;
3745                 }
3746         }
3747
3748         return err;
3749 }
3750
3751 /*
3752  * Sets
3753  */
3754 static const struct nft_set_type *nft_set_types[] = {
3755         &nft_set_hash_fast_type,
3756         &nft_set_hash_type,
3757         &nft_set_rhash_type,
3758         &nft_set_bitmap_type,
3759         &nft_set_rbtree_type,
3760 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3761         &nft_set_pipapo_avx2_type,
3762 #endif
3763         &nft_set_pipapo_type,
3764 };
3765
3766 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3767                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3768                                  NFT_SET_EVAL)
3769
3770 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3771 {
3772         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3773 }
3774
3775 /*
3776  * Select a set implementation based on the data characteristics and the
3777  * given policy. The total memory use might not be known if no size is
3778  * given, in that case the amount of memory per element is used.
3779  */
3780 static const struct nft_set_ops *
3781 nft_select_set_ops(const struct nft_ctx *ctx,
3782                    const struct nlattr * const nla[],
3783                    const struct nft_set_desc *desc)
3784 {
3785         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3786         const struct nft_set_ops *ops, *bops;
3787         struct nft_set_estimate est, best;
3788         const struct nft_set_type *type;
3789         u32 flags = 0;
3790         int i;
3791
3792         lockdep_assert_held(&nft_net->commit_mutex);
3793         lockdep_nfnl_nft_mutex_not_held();
3794
3795         if (nla[NFTA_SET_FLAGS] != NULL)
3796                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3797
3798         bops        = NULL;
3799         best.size   = ~0;
3800         best.lookup = ~0;
3801         best.space  = ~0;
3802
3803         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3804                 type = nft_set_types[i];
3805                 ops = &type->ops;
3806
3807                 if (!nft_set_ops_candidate(type, flags))
3808                         continue;
3809                 if (!ops->estimate(desc, flags, &est))
3810                         continue;
3811
3812                 switch (desc->policy) {
3813                 case NFT_SET_POL_PERFORMANCE:
3814                         if (est.lookup < best.lookup)
3815                                 break;
3816                         if (est.lookup == best.lookup &&
3817                             est.space < best.space)
3818                                 break;
3819                         continue;
3820                 case NFT_SET_POL_MEMORY:
3821                         if (!desc->size) {
3822                                 if (est.space < best.space)
3823                                         break;
3824                                 if (est.space == best.space &&
3825                                     est.lookup < best.lookup)
3826                                         break;
3827                         } else if (est.size < best.size || !bops) {
3828                                 break;
3829                         }
3830                         continue;
3831                 default:
3832                         break;
3833                 }
3834
3835                 bops = ops;
3836                 best = est;
3837         }
3838
3839         if (bops != NULL)
3840                 return bops;
3841
3842         return ERR_PTR(-EOPNOTSUPP);
3843 }
3844
3845 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3846         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3847                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3848         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3849                                             .len = NFT_SET_MAXNAMELEN - 1 },
3850         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3851         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3852         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3853         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3854         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3855         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3856         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3857         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3858         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3859         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3860         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3861                                             .len  = NFT_USERDATA_MAXLEN },
3862         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3863         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3864         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3865         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
3866 };
3867
3868 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3869         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3870         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3871 };
3872
3873 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3874                                       const struct nlattr *nla, u8 genmask)
3875 {
3876         struct nft_set *set;
3877
3878         if (nla == NULL)
3879                 return ERR_PTR(-EINVAL);
3880
3881         list_for_each_entry_rcu(set, &table->sets, list) {
3882                 if (!nla_strcmp(nla, set->name) &&
3883                     nft_active_genmask(set, genmask))
3884                         return set;
3885         }
3886         return ERR_PTR(-ENOENT);
3887 }
3888
3889 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3890                                                const struct nlattr *nla,
3891                                                u8 genmask)
3892 {
3893         struct nft_set *set;
3894
3895         list_for_each_entry(set, &table->sets, list) {
3896                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3897                     nft_active_genmask(set, genmask))
3898                         return set;
3899         }
3900         return ERR_PTR(-ENOENT);
3901 }
3902
3903 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3904                                            const struct nft_table *table,
3905                                            const struct nlattr *nla, u8 genmask)
3906 {
3907         struct nftables_pernet *nft_net = nft_pernet(net);
3908         u32 id = ntohl(nla_get_be32(nla));
3909         struct nft_trans *trans;
3910
3911         list_for_each_entry(trans, &nft_net->commit_list, list) {
3912                 if (trans->msg_type == NFT_MSG_NEWSET) {
3913                         struct nft_set *set = nft_trans_set(trans);
3914
3915                         if (id == nft_trans_set_id(trans) &&
3916                             set->table == table &&
3917                             nft_active_genmask(set, genmask))
3918                                 return set;
3919                 }
3920         }
3921         return ERR_PTR(-ENOENT);
3922 }
3923
3924 struct nft_set *nft_set_lookup_global(const struct net *net,
3925                                       const struct nft_table *table,
3926                                       const struct nlattr *nla_set_name,
3927                                       const struct nlattr *nla_set_id,
3928                                       u8 genmask)
3929 {
3930         struct nft_set *set;
3931
3932         set = nft_set_lookup(table, nla_set_name, genmask);
3933         if (IS_ERR(set)) {
3934                 if (!nla_set_id)
3935                         return set;
3936
3937                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
3938         }
3939         return set;
3940 }
3941 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3942
3943 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3944                                     const char *name)
3945 {
3946         const struct nft_set *i;
3947         const char *p;
3948         unsigned long *inuse;
3949         unsigned int n = 0, min = 0;
3950
3951         p = strchr(name, '%');
3952         if (p != NULL) {
3953                 if (p[1] != 'd' || strchr(p + 2, '%'))
3954                         return -EINVAL;
3955
3956                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3957                 if (inuse == NULL)
3958                         return -ENOMEM;
3959 cont:
3960                 list_for_each_entry(i, &ctx->table->sets, list) {
3961                         int tmp;
3962
3963                         if (!nft_is_active_next(ctx->net, i))
3964                                 continue;
3965                         if (!sscanf(i->name, name, &tmp))
3966                                 continue;
3967                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3968                                 continue;
3969
3970                         set_bit(tmp - min, inuse);
3971                 }
3972
3973                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3974                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3975                         min += BITS_PER_BYTE * PAGE_SIZE;
3976                         memset(inuse, 0, PAGE_SIZE);
3977                         goto cont;
3978                 }
3979                 free_page((unsigned long)inuse);
3980         }
3981
3982         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
3983         if (!set->name)
3984                 return -ENOMEM;
3985
3986         list_for_each_entry(i, &ctx->table->sets, list) {
3987                 if (!nft_is_active_next(ctx->net, i))
3988                         continue;
3989                 if (!strcmp(set->name, i->name)) {
3990                         kfree(set->name);
3991                         set->name = NULL;
3992                         return -ENFILE;
3993                 }
3994         }
3995         return 0;
3996 }
3997
3998 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3999 {
4000         u64 ms = be64_to_cpu(nla_get_be64(nla));
4001         u64 max = (u64)(~((u64)0));
4002
4003         max = div_u64(max, NSEC_PER_MSEC);
4004         if (ms >= max)
4005                 return -ERANGE;
4006
4007         ms *= NSEC_PER_MSEC;
4008         *result = nsecs_to_jiffies64(ms);
4009         return 0;
4010 }
4011
4012 __be64 nf_jiffies64_to_msecs(u64 input)
4013 {
4014         return cpu_to_be64(jiffies64_to_msecs(input));
4015 }
4016
4017 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4018                                      const struct nft_set *set)
4019 {
4020         struct nlattr *concat, *field;
4021         int i;
4022
4023         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4024         if (!concat)
4025                 return -ENOMEM;
4026
4027         for (i = 0; i < set->field_count; i++) {
4028                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4029                 if (!field)
4030                         return -ENOMEM;
4031
4032                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4033                                  htonl(set->field_len[i])))
4034                         return -ENOMEM;
4035
4036                 nla_nest_end(skb, field);
4037         }
4038
4039         nla_nest_end(skb, concat);
4040
4041         return 0;
4042 }
4043
4044 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4045                               const struct nft_set *set, u16 event, u16 flags)
4046 {
4047         struct nlmsghdr *nlh;
4048         u32 portid = ctx->portid;
4049         struct nlattr *nest;
4050         u32 seq = ctx->seq;
4051         int i;
4052
4053         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4054         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4055                            NFNETLINK_V0, nft_base_seq(ctx->net));
4056         if (!nlh)
4057                 goto nla_put_failure;
4058
4059         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4060                 goto nla_put_failure;
4061         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4062                 goto nla_put_failure;
4063         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4064                          NFTA_SET_PAD))
4065                 goto nla_put_failure;
4066         if (set->flags != 0)
4067                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4068                         goto nla_put_failure;
4069
4070         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4071                 goto nla_put_failure;
4072         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4073                 goto nla_put_failure;
4074         if (set->flags & NFT_SET_MAP) {
4075                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4076                         goto nla_put_failure;
4077                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4078                         goto nla_put_failure;
4079         }
4080         if (set->flags & NFT_SET_OBJECT &&
4081             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4082                 goto nla_put_failure;
4083
4084         if (set->timeout &&
4085             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4086                          nf_jiffies64_to_msecs(set->timeout),
4087                          NFTA_SET_PAD))
4088                 goto nla_put_failure;
4089         if (set->gc_int &&
4090             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
4091                 goto nla_put_failure;
4092
4093         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4094                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4095                         goto nla_put_failure;
4096         }
4097
4098         if (set->udata &&
4099             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4100                 goto nla_put_failure;
4101
4102         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4103         if (!nest)
4104                 goto nla_put_failure;
4105         if (set->size &&
4106             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4107                 goto nla_put_failure;
4108
4109         if (set->field_count > 1 &&
4110             nf_tables_fill_set_concat(skb, set))
4111                 goto nla_put_failure;
4112
4113         nla_nest_end(skb, nest);
4114
4115         if (set->num_exprs == 1) {
4116                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4117                 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4118                         goto nla_put_failure;
4119
4120                 nla_nest_end(skb, nest);
4121         } else if (set->num_exprs > 1) {
4122                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4123                 if (nest == NULL)
4124                         goto nla_put_failure;
4125
4126                 for (i = 0; i < set->num_exprs; i++) {
4127                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4128                                           set->exprs[i], false) < 0)
4129                                 goto nla_put_failure;
4130                 }
4131                 nla_nest_end(skb, nest);
4132         }
4133
4134         nlmsg_end(skb, nlh);
4135         return 0;
4136
4137 nla_put_failure:
4138         nlmsg_trim(skb, nlh);
4139         return -1;
4140 }
4141
4142 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4143                                  const struct nft_set *set, int event,
4144                                  gfp_t gfp_flags)
4145 {
4146         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4147         u32 portid = ctx->portid;
4148         struct sk_buff *skb;
4149         u16 flags = 0;
4150         int err;
4151
4152         if (!ctx->report &&
4153             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4154                 return;
4155
4156         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4157         if (skb == NULL)
4158                 goto err;
4159
4160         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4161                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4162
4163         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4164         if (err < 0) {
4165                 kfree_skb(skb);
4166                 goto err;
4167         }
4168
4169         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4170         return;
4171 err:
4172         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4173 }
4174
4175 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4176 {
4177         const struct nft_set *set;
4178         unsigned int idx, s_idx = cb->args[0];
4179         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4180         struct net *net = sock_net(skb->sk);
4181         struct nft_ctx *ctx = cb->data, ctx_set;
4182         struct nftables_pernet *nft_net;
4183
4184         if (cb->args[1])
4185                 return skb->len;
4186
4187         rcu_read_lock();
4188         nft_net = nft_pernet(net);
4189         cb->seq = READ_ONCE(nft_net->base_seq);
4190
4191         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4192                 if (ctx->family != NFPROTO_UNSPEC &&
4193                     ctx->family != table->family)
4194                         continue;
4195
4196                 if (ctx->table && ctx->table != table)
4197                         continue;
4198
4199                 if (cur_table) {
4200                         if (cur_table != table)
4201                                 continue;
4202
4203                         cur_table = NULL;
4204                 }
4205                 idx = 0;
4206                 list_for_each_entry_rcu(set, &table->sets, list) {
4207                         if (idx < s_idx)
4208                                 goto cont;
4209                         if (!nft_is_active(net, set))
4210                                 goto cont;
4211
4212                         ctx_set = *ctx;
4213                         ctx_set.table = table;
4214                         ctx_set.family = table->family;
4215
4216                         if (nf_tables_fill_set(skb, &ctx_set, set,
4217                                                NFT_MSG_NEWSET,
4218                                                NLM_F_MULTI) < 0) {
4219                                 cb->args[0] = idx;
4220                                 cb->args[2] = (unsigned long) table;
4221                                 goto done;
4222                         }
4223                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4224 cont:
4225                         idx++;
4226                 }
4227                 if (s_idx)
4228                         s_idx = 0;
4229         }
4230         cb->args[1] = 1;
4231 done:
4232         rcu_read_unlock();
4233         return skb->len;
4234 }
4235
4236 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4237 {
4238         struct nft_ctx *ctx_dump = NULL;
4239
4240         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4241         if (ctx_dump == NULL)
4242                 return -ENOMEM;
4243
4244         cb->data = ctx_dump;
4245         return 0;
4246 }
4247
4248 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4249 {
4250         kfree(cb->data);
4251         return 0;
4252 }
4253
4254 /* called with rcu_read_lock held */
4255 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4256                             const struct nlattr * const nla[])
4257 {
4258         struct netlink_ext_ack *extack = info->extack;
4259         u8 genmask = nft_genmask_cur(info->net);
4260         u8 family = info->nfmsg->nfgen_family;
4261         struct nft_table *table = NULL;
4262         struct net *net = info->net;
4263         const struct nft_set *set;
4264         struct sk_buff *skb2;
4265         struct nft_ctx ctx;
4266         int err;
4267
4268         if (nla[NFTA_SET_TABLE]) {
4269                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4270                                          genmask, 0);
4271                 if (IS_ERR(table)) {
4272                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4273                         return PTR_ERR(table);
4274                 }
4275         }
4276
4277         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4278
4279         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4280                 struct netlink_dump_control c = {
4281                         .start = nf_tables_dump_sets_start,
4282                         .dump = nf_tables_dump_sets,
4283                         .done = nf_tables_dump_sets_done,
4284                         .data = &ctx,
4285                         .module = THIS_MODULE,
4286                 };
4287
4288                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4289         }
4290
4291         /* Only accept unspec with dump */
4292         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4293                 return -EAFNOSUPPORT;
4294         if (!nla[NFTA_SET_TABLE])
4295                 return -EINVAL;
4296
4297         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4298         if (IS_ERR(set))
4299                 return PTR_ERR(set);
4300
4301         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4302         if (skb2 == NULL)
4303                 return -ENOMEM;
4304
4305         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4306         if (err < 0)
4307                 goto err_fill_set_info;
4308
4309         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4310
4311 err_fill_set_info:
4312         kfree_skb(skb2);
4313         return err;
4314 }
4315
4316 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4317         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4318 };
4319
4320 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4321                                      struct nft_set_desc *desc)
4322 {
4323         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4324         u32 len;
4325         int err;
4326
4327         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4328                 return -E2BIG;
4329
4330         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4331                                           nft_concat_policy, NULL);
4332         if (err < 0)
4333                 return err;
4334
4335         if (!tb[NFTA_SET_FIELD_LEN])
4336                 return -EINVAL;
4337
4338         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4339         if (!len || len > U8_MAX)
4340                 return -EINVAL;
4341
4342         desc->field_len[desc->field_count++] = len;
4343
4344         return 0;
4345 }
4346
4347 static int nft_set_desc_concat(struct nft_set_desc *desc,
4348                                const struct nlattr *nla)
4349 {
4350         struct nlattr *attr;
4351         u32 num_regs = 0;
4352         int rem, err, i;
4353
4354         nla_for_each_nested(attr, nla, rem) {
4355                 if (nla_type(attr) != NFTA_LIST_ELEM)
4356                         return -EINVAL;
4357
4358                 err = nft_set_desc_concat_parse(attr, desc);
4359                 if (err < 0)
4360                         return err;
4361         }
4362
4363         for (i = 0; i < desc->field_count; i++)
4364                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4365
4366         if (num_regs > NFT_REG32_COUNT)
4367                 return -E2BIG;
4368
4369         return 0;
4370 }
4371
4372 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4373                                     const struct nlattr *nla)
4374 {
4375         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4376         int err;
4377
4378         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4379                                           nft_set_desc_policy, NULL);
4380         if (err < 0)
4381                 return err;
4382
4383         if (da[NFTA_SET_DESC_SIZE] != NULL)
4384                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4385         if (da[NFTA_SET_DESC_CONCAT])
4386                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4387
4388         return err;
4389 }
4390
4391 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4392                               const struct nlattr * const *nla,
4393                               struct nft_expr **exprs, int *num_exprs,
4394                               u32 flags)
4395 {
4396         struct nft_expr *expr;
4397         int err, i;
4398
4399         if (nla[NFTA_SET_EXPR]) {
4400                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4401                 if (IS_ERR(expr)) {
4402                         err = PTR_ERR(expr);
4403                         goto err_set_expr_alloc;
4404                 }
4405                 exprs[0] = expr;
4406                 (*num_exprs)++;
4407         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4408                 struct nlattr *tmp;
4409                 int left;
4410
4411                 if (!(flags & NFT_SET_EXPR)) {
4412                         err = -EINVAL;
4413                         goto err_set_expr_alloc;
4414                 }
4415                 i = 0;
4416                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4417                         if (i == NFT_SET_EXPR_MAX) {
4418                                 err = -E2BIG;
4419                                 goto err_set_expr_alloc;
4420                         }
4421                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4422                                 err = -EINVAL;
4423                                 goto err_set_expr_alloc;
4424                         }
4425                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4426                         if (IS_ERR(expr)) {
4427                                 err = PTR_ERR(expr);
4428                                 goto err_set_expr_alloc;
4429                         }
4430                         exprs[i++] = expr;
4431                         (*num_exprs)++;
4432                 }
4433         }
4434
4435         return 0;
4436
4437 err_set_expr_alloc:
4438         for (i = 0; i < *num_exprs; i++)
4439                 nft_expr_destroy(ctx, exprs[i]);
4440
4441         return err;
4442 }
4443
4444 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4445                             const struct nlattr * const nla[])
4446 {
4447         struct netlink_ext_ack *extack = info->extack;
4448         u8 genmask = nft_genmask_next(info->net);
4449         u8 family = info->nfmsg->nfgen_family;
4450         const struct nft_set_ops *ops;
4451         struct net *net = info->net;
4452         struct nft_set_desc desc;
4453         struct nft_table *table;
4454         unsigned char *udata;
4455         struct nft_set *set;
4456         struct nft_ctx ctx;
4457         size_t alloc_size;
4458         int num_exprs = 0;
4459         char *name;
4460         int err, i;
4461         u16 udlen;
4462         u32 flags;
4463         u64 size;
4464
4465         if (nla[NFTA_SET_TABLE] == NULL ||
4466             nla[NFTA_SET_NAME] == NULL ||
4467             nla[NFTA_SET_KEY_LEN] == NULL ||
4468             nla[NFTA_SET_ID] == NULL)
4469                 return -EINVAL;
4470
4471         memset(&desc, 0, sizeof(desc));
4472
4473         desc.ktype = NFT_DATA_VALUE;
4474         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4475                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4476                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4477                         return -EINVAL;
4478         }
4479
4480         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4481         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4482                 return -EINVAL;
4483
4484         flags = 0;
4485         if (nla[NFTA_SET_FLAGS] != NULL) {
4486                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4487                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4488                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4489                               NFT_SET_MAP | NFT_SET_EVAL |
4490                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4491                         return -EOPNOTSUPP;
4492                 /* Only one of these operations is supported */
4493                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4494                              (NFT_SET_MAP | NFT_SET_OBJECT))
4495                         return -EOPNOTSUPP;
4496                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4497                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4498                         return -EOPNOTSUPP;
4499         }
4500
4501         desc.dtype = 0;
4502         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4503                 if (!(flags & NFT_SET_MAP))
4504                         return -EINVAL;
4505
4506                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4507                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4508                     desc.dtype != NFT_DATA_VERDICT)
4509                         return -EINVAL;
4510
4511                 if (desc.dtype != NFT_DATA_VERDICT) {
4512                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4513                                 return -EINVAL;
4514                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4515                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4516                                 return -EINVAL;
4517                 } else
4518                         desc.dlen = sizeof(struct nft_verdict);
4519         } else if (flags & NFT_SET_MAP)
4520                 return -EINVAL;
4521
4522         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4523                 if (!(flags & NFT_SET_OBJECT))
4524                         return -EINVAL;
4525
4526                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4527                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4528                     desc.objtype > NFT_OBJECT_MAX)
4529                         return -EOPNOTSUPP;
4530         } else if (flags & NFT_SET_OBJECT)
4531                 return -EINVAL;
4532         else
4533                 desc.objtype = NFT_OBJECT_UNSPEC;
4534
4535         desc.timeout = 0;
4536         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4537                 if (!(flags & NFT_SET_TIMEOUT))
4538                         return -EINVAL;
4539
4540                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4541                 if (err)
4542                         return err;
4543         }
4544         desc.gc_int = 0;
4545         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4546                 if (!(flags & NFT_SET_TIMEOUT))
4547                         return -EINVAL;
4548                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4549         }
4550
4551         desc.policy = NFT_SET_POL_PERFORMANCE;
4552         if (nla[NFTA_SET_POLICY] != NULL)
4553                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4554
4555         if (nla[NFTA_SET_DESC] != NULL) {
4556                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4557                 if (err < 0)
4558                         return err;
4559
4560                 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4561                         return -EINVAL;
4562         } else if (flags & NFT_SET_CONCAT) {
4563                 return -EINVAL;
4564         }
4565
4566         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4567                 desc.expr = true;
4568
4569         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4570                                  NETLINK_CB(skb).portid);
4571         if (IS_ERR(table)) {
4572                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4573                 return PTR_ERR(table);
4574         }
4575
4576         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4577
4578         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4579         if (IS_ERR(set)) {
4580                 if (PTR_ERR(set) != -ENOENT) {
4581                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4582                         return PTR_ERR(set);
4583                 }
4584         } else {
4585                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
4586
4587                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4588                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4589                         return -EEXIST;
4590                 }
4591                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4592                         return -EOPNOTSUPP;
4593
4594                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
4595                 if (err < 0)
4596                         return err;
4597
4598                 for (i = 0; i < num_exprs; i++)
4599                         nft_expr_destroy(&ctx, exprs[i]);
4600
4601                 return 0;
4602         }
4603
4604         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4605                 return -ENOENT;
4606
4607         ops = nft_select_set_ops(&ctx, nla, &desc);
4608         if (IS_ERR(ops))
4609                 return PTR_ERR(ops);
4610
4611         udlen = 0;
4612         if (nla[NFTA_SET_USERDATA])
4613                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4614
4615         size = 0;
4616         if (ops->privsize != NULL)
4617                 size = ops->privsize(nla, &desc);
4618         alloc_size = sizeof(*set) + size + udlen;
4619         if (alloc_size < size || alloc_size > INT_MAX)
4620                 return -ENOMEM;
4621         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
4622         if (!set)
4623                 return -ENOMEM;
4624
4625         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
4626         if (!name) {
4627                 err = -ENOMEM;
4628                 goto err_set_name;
4629         }
4630
4631         err = nf_tables_set_alloc_name(&ctx, set, name);
4632         kfree(name);
4633         if (err < 0)
4634                 goto err_set_name;
4635
4636         udata = NULL;
4637         if (udlen) {
4638                 udata = set->data + size;
4639                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4640         }
4641
4642         INIT_LIST_HEAD(&set->bindings);
4643         INIT_LIST_HEAD(&set->catchall_list);
4644         set->table = table;
4645         write_pnet(&set->net, net);
4646         set->ops = ops;
4647         set->ktype = desc.ktype;
4648         set->klen = desc.klen;
4649         set->dtype = desc.dtype;
4650         set->objtype = desc.objtype;
4651         set->dlen = desc.dlen;
4652         set->flags = flags;
4653         set->size = desc.size;
4654         set->policy = desc.policy;
4655         set->udlen = udlen;
4656         set->udata = udata;
4657         set->timeout = desc.timeout;
4658         set->gc_int = desc.gc_int;
4659
4660         set->field_count = desc.field_count;
4661         for (i = 0; i < desc.field_count; i++)
4662                 set->field_len[i] = desc.field_len[i];
4663
4664         err = ops->init(set, &desc, nla);
4665         if (err < 0)
4666                 goto err_set_init;
4667
4668         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
4669         if (err < 0)
4670                 goto err_set_destroy;
4671
4672         set->num_exprs = num_exprs;
4673         set->handle = nf_tables_alloc_handle(table);
4674
4675         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4676         if (err < 0)
4677                 goto err_set_expr_alloc;
4678
4679         list_add_tail_rcu(&set->list, &table->sets);
4680         table->use++;
4681         return 0;
4682
4683 err_set_expr_alloc:
4684         for (i = 0; i < set->num_exprs; i++)
4685                 nft_expr_destroy(&ctx, set->exprs[i]);
4686 err_set_destroy:
4687         ops->destroy(set);
4688 err_set_init:
4689         kfree(set->name);
4690 err_set_name:
4691         kvfree(set);
4692         return err;
4693 }
4694
4695 struct nft_set_elem_catchall {
4696         struct list_head        list;
4697         struct rcu_head         rcu;
4698         void                    *elem;
4699 };
4700
4701 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4702                                      struct nft_set *set)
4703 {
4704         struct nft_set_elem_catchall *next, *catchall;
4705
4706         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4707                 list_del_rcu(&catchall->list);
4708                 nft_set_elem_destroy(set, catchall->elem, true);
4709                 kfree_rcu(catchall, rcu);
4710         }
4711 }
4712
4713 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4714 {
4715         int i;
4716
4717         if (WARN_ON(set->use > 0))
4718                 return;
4719
4720         for (i = 0; i < set->num_exprs; i++)
4721                 nft_expr_destroy(ctx, set->exprs[i]);
4722
4723         set->ops->destroy(set);
4724         nft_set_catchall_destroy(ctx, set);
4725         kfree(set->name);
4726         kvfree(set);
4727 }
4728
4729 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4730                             const struct nlattr * const nla[])
4731 {
4732         struct netlink_ext_ack *extack = info->extack;
4733         u8 genmask = nft_genmask_next(info->net);
4734         u8 family = info->nfmsg->nfgen_family;
4735         struct net *net = info->net;
4736         const struct nlattr *attr;
4737         struct nft_table *table;
4738         struct nft_set *set;
4739         struct nft_ctx ctx;
4740
4741         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4742                 return -EAFNOSUPPORT;
4743
4744         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4745                                  genmask, NETLINK_CB(skb).portid);
4746         if (IS_ERR(table)) {
4747                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4748                 return PTR_ERR(table);
4749         }
4750
4751         if (nla[NFTA_SET_HANDLE]) {
4752                 attr = nla[NFTA_SET_HANDLE];
4753                 set = nft_set_lookup_byhandle(table, attr, genmask);
4754         } else {
4755                 attr = nla[NFTA_SET_NAME];
4756                 set = nft_set_lookup(table, attr, genmask);
4757         }
4758
4759         if (IS_ERR(set)) {
4760                 NL_SET_BAD_ATTR(extack, attr);
4761                 return PTR_ERR(set);
4762         }
4763         if (set->use ||
4764             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4765              atomic_read(&set->nelems) > 0)) {
4766                 NL_SET_BAD_ATTR(extack, attr);
4767                 return -EBUSY;
4768         }
4769
4770         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4771
4772         return nft_delset(&ctx, set);
4773 }
4774
4775 static int nft_validate_register_store(const struct nft_ctx *ctx,
4776                                        enum nft_registers reg,
4777                                        const struct nft_data *data,
4778                                        enum nft_data_types type,
4779                                        unsigned int len);
4780
4781 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4782                                      struct nft_set *set,
4783                                      struct nft_set_elem *elem)
4784 {
4785         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4786         enum nft_registers dreg;
4787
4788         dreg = nft_type_to_reg(set->dtype);
4789         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4790                                            set->dtype == NFT_DATA_VERDICT ?
4791                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4792                                            set->dlen);
4793 }
4794
4795 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4796                                         struct nft_set *set,
4797                                         const struct nft_set_iter *iter,
4798                                         struct nft_set_elem *elem)
4799 {
4800         return nft_setelem_data_validate(ctx, set, elem);
4801 }
4802
4803 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4804                                        struct nft_set *set)
4805 {
4806         u8 genmask = nft_genmask_next(ctx->net);
4807         struct nft_set_elem_catchall *catchall;
4808         struct nft_set_elem elem;
4809         struct nft_set_ext *ext;
4810         int ret = 0;
4811
4812         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4813                 ext = nft_set_elem_ext(set, catchall->elem);
4814                 if (!nft_set_elem_active(ext, genmask))
4815                         continue;
4816
4817                 elem.priv = catchall->elem;
4818                 ret = nft_setelem_data_validate(ctx, set, &elem);
4819                 if (ret < 0)
4820                         break;
4821         }
4822
4823         return ret;
4824 }
4825
4826 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4827                        struct nft_set_binding *binding)
4828 {
4829         struct nft_set_binding *i;
4830         struct nft_set_iter iter;
4831
4832         if (set->use == UINT_MAX)
4833                 return -EOVERFLOW;
4834
4835         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4836                 return -EBUSY;
4837
4838         if (binding->flags & NFT_SET_MAP) {
4839                 /* If the set is already bound to the same chain all
4840                  * jumps are already validated for that chain.
4841                  */
4842                 list_for_each_entry(i, &set->bindings, list) {
4843                         if (i->flags & NFT_SET_MAP &&
4844                             i->chain == binding->chain)
4845                                 goto bind;
4846                 }
4847
4848                 iter.genmask    = nft_genmask_next(ctx->net);
4849                 iter.skip       = 0;
4850                 iter.count      = 0;
4851                 iter.err        = 0;
4852                 iter.fn         = nf_tables_bind_check_setelem;
4853
4854                 set->ops->walk(ctx, set, &iter);
4855                 if (!iter.err)
4856                         iter.err = nft_set_catchall_bind_check(ctx, set);
4857
4858                 if (iter.err < 0)
4859                         return iter.err;
4860         }
4861 bind:
4862         binding->chain = ctx->chain;
4863         list_add_tail_rcu(&binding->list, &set->bindings);
4864         nft_set_trans_bind(ctx, set);
4865         set->use++;
4866
4867         return 0;
4868 }
4869 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4870
4871 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4872                                  struct nft_set_binding *binding, bool event)
4873 {
4874         list_del_rcu(&binding->list);
4875
4876         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4877                 list_del_rcu(&set->list);
4878                 if (event)
4879                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4880                                              GFP_KERNEL);
4881         }
4882 }
4883
4884 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4885                               struct nft_set_binding *binding,
4886                               enum nft_trans_phase phase)
4887 {
4888         switch (phase) {
4889         case NFT_TRANS_PREPARE:
4890                 set->use--;
4891                 return;
4892         case NFT_TRANS_ABORT:
4893         case NFT_TRANS_RELEASE:
4894                 set->use--;
4895                 fallthrough;
4896         default:
4897                 nf_tables_unbind_set(ctx, set, binding,
4898                                      phase == NFT_TRANS_COMMIT);
4899         }
4900 }
4901 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4902
4903 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4904 {
4905         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4906                 nft_set_destroy(ctx, set);
4907 }
4908 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4909
4910 const struct nft_set_ext_type nft_set_ext_types[] = {
4911         [NFT_SET_EXT_KEY]               = {
4912                 .align  = __alignof__(u32),
4913         },
4914         [NFT_SET_EXT_DATA]              = {
4915                 .align  = __alignof__(u32),
4916         },
4917         [NFT_SET_EXT_EXPRESSIONS]       = {
4918                 .align  = __alignof__(struct nft_set_elem_expr),
4919         },
4920         [NFT_SET_EXT_OBJREF]            = {
4921                 .len    = sizeof(struct nft_object *),
4922                 .align  = __alignof__(struct nft_object *),
4923         },
4924         [NFT_SET_EXT_FLAGS]             = {
4925                 .len    = sizeof(u8),
4926                 .align  = __alignof__(u8),
4927         },
4928         [NFT_SET_EXT_TIMEOUT]           = {
4929                 .len    = sizeof(u64),
4930                 .align  = __alignof__(u64),
4931         },
4932         [NFT_SET_EXT_EXPIRATION]        = {
4933                 .len    = sizeof(u64),
4934                 .align  = __alignof__(u64),
4935         },
4936         [NFT_SET_EXT_USERDATA]          = {
4937                 .len    = sizeof(struct nft_userdata),
4938                 .align  = __alignof__(struct nft_userdata),
4939         },
4940         [NFT_SET_EXT_KEY_END]           = {
4941                 .align  = __alignof__(u32),
4942         },
4943 };
4944
4945 /*
4946  * Set elements
4947  */
4948
4949 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4950         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
4951         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
4952         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
4953         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
4954         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
4955         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
4956                                             .len = NFT_USERDATA_MAXLEN },
4957         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
4958         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
4959                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
4960         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
4961         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
4962 };
4963
4964 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4965         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
4966                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4967         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
4968                                             .len = NFT_SET_MAXNAMELEN - 1 },
4969         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
4970         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
4971 };
4972
4973 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4974                                   const struct nft_set *set,
4975                                   const struct nft_set_ext *ext)
4976 {
4977         struct nft_set_elem_expr *elem_expr;
4978         u32 size, num_exprs = 0;
4979         struct nft_expr *expr;
4980         struct nlattr *nest;
4981
4982         elem_expr = nft_set_ext_expr(ext);
4983         nft_setelem_expr_foreach(expr, elem_expr, size)
4984                 num_exprs++;
4985
4986         if (num_exprs == 1) {
4987                 expr = nft_setelem_expr_at(elem_expr, 0);
4988                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, false) < 0)
4989                         return -1;
4990
4991                 return 0;
4992         } else if (num_exprs > 1) {
4993                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4994                 if (nest == NULL)
4995                         goto nla_put_failure;
4996
4997                 nft_setelem_expr_foreach(expr, elem_expr, size) {
4998                         expr = nft_setelem_expr_at(elem_expr, size);
4999                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, false) < 0)
5000                                 goto nla_put_failure;
5001                 }
5002                 nla_nest_end(skb, nest);
5003         }
5004         return 0;
5005
5006 nla_put_failure:
5007         return -1;
5008 }
5009
5010 static int nf_tables_fill_setelem(struct sk_buff *skb,
5011                                   const struct nft_set *set,
5012                                   const struct nft_set_elem *elem)
5013 {
5014         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5015         unsigned char *b = skb_tail_pointer(skb);
5016         struct nlattr *nest;
5017
5018         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5019         if (nest == NULL)
5020                 goto nla_put_failure;
5021
5022         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5023             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5024                           NFT_DATA_VALUE, set->klen) < 0)
5025                 goto nla_put_failure;
5026
5027         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5028             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5029                           NFT_DATA_VALUE, set->klen) < 0)
5030                 goto nla_put_failure;
5031
5032         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5033             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5034                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5035                           set->dlen) < 0)
5036                 goto nla_put_failure;
5037
5038         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5039             nft_set_elem_expr_dump(skb, set, ext))
5040                 goto nla_put_failure;
5041
5042         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5043             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5044                            (*nft_set_ext_obj(ext))->key.name) < 0)
5045                 goto nla_put_failure;
5046
5047         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5048             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5049                          htonl(*nft_set_ext_flags(ext))))
5050                 goto nla_put_failure;
5051
5052         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5053             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5054                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5055                          NFTA_SET_ELEM_PAD))
5056                 goto nla_put_failure;
5057
5058         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5059                 u64 expires, now = get_jiffies_64();
5060
5061                 expires = *nft_set_ext_expiration(ext);
5062                 if (time_before64(now, expires))
5063                         expires -= now;
5064                 else
5065                         expires = 0;
5066
5067                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5068                                  nf_jiffies64_to_msecs(expires),
5069                                  NFTA_SET_ELEM_PAD))
5070                         goto nla_put_failure;
5071         }
5072
5073         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5074                 struct nft_userdata *udata;
5075
5076                 udata = nft_set_ext_userdata(ext);
5077                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5078                             udata->len + 1, udata->data))
5079                         goto nla_put_failure;
5080         }
5081
5082         nla_nest_end(skb, nest);
5083         return 0;
5084
5085 nla_put_failure:
5086         nlmsg_trim(skb, b);
5087         return -EMSGSIZE;
5088 }
5089
5090 struct nft_set_dump_args {
5091         const struct netlink_callback   *cb;
5092         struct nft_set_iter             iter;
5093         struct sk_buff                  *skb;
5094 };
5095
5096 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5097                                   struct nft_set *set,
5098                                   const struct nft_set_iter *iter,
5099                                   struct nft_set_elem *elem)
5100 {
5101         struct nft_set_dump_args *args;
5102
5103         args = container_of(iter, struct nft_set_dump_args, iter);
5104         return nf_tables_fill_setelem(args->skb, set, elem);
5105 }
5106
5107 struct nft_set_dump_ctx {
5108         const struct nft_set    *set;
5109         struct nft_ctx          ctx;
5110 };
5111
5112 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5113                                  const struct nft_set *set)
5114 {
5115         struct nft_set_elem_catchall *catchall;
5116         u8 genmask = nft_genmask_cur(net);
5117         struct nft_set_elem elem;
5118         struct nft_set_ext *ext;
5119         int ret = 0;
5120
5121         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5122                 ext = nft_set_elem_ext(set, catchall->elem);
5123                 if (!nft_set_elem_active(ext, genmask) ||
5124                     nft_set_elem_expired(ext))
5125                         continue;
5126
5127                 elem.priv = catchall->elem;
5128                 ret = nf_tables_fill_setelem(skb, set, &elem);
5129                 break;
5130         }
5131
5132         return ret;
5133 }
5134
5135 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5136 {
5137         struct nft_set_dump_ctx *dump_ctx = cb->data;
5138         struct net *net = sock_net(skb->sk);
5139         struct nftables_pernet *nft_net;
5140         struct nft_table *table;
5141         struct nft_set *set;
5142         struct nft_set_dump_args args;
5143         bool set_found = false;
5144         struct nlmsghdr *nlh;
5145         struct nlattr *nest;
5146         u32 portid, seq;
5147         int event;
5148
5149         rcu_read_lock();
5150         nft_net = nft_pernet(net);
5151         cb->seq = READ_ONCE(nft_net->base_seq);
5152
5153         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5154                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5155                     dump_ctx->ctx.family != table->family)
5156                         continue;
5157
5158                 if (table != dump_ctx->ctx.table)
5159                         continue;
5160
5161                 list_for_each_entry_rcu(set, &table->sets, list) {
5162                         if (set == dump_ctx->set) {
5163                                 set_found = true;
5164                                 break;
5165                         }
5166                 }
5167                 break;
5168         }
5169
5170         if (!set_found) {
5171                 rcu_read_unlock();
5172                 return -ENOENT;
5173         }
5174
5175         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5176         portid = NETLINK_CB(cb->skb).portid;
5177         seq    = cb->nlh->nlmsg_seq;
5178
5179         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5180                            table->family, NFNETLINK_V0, nft_base_seq(net));
5181         if (!nlh)
5182                 goto nla_put_failure;
5183
5184         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5185                 goto nla_put_failure;
5186         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5187                 goto nla_put_failure;
5188
5189         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5190         if (nest == NULL)
5191                 goto nla_put_failure;
5192
5193         args.cb                 = cb;
5194         args.skb                = skb;
5195         args.iter.genmask       = nft_genmask_cur(net);
5196         args.iter.skip          = cb->args[0];
5197         args.iter.count         = 0;
5198         args.iter.err           = 0;
5199         args.iter.fn            = nf_tables_dump_setelem;
5200         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5201
5202         if (!args.iter.err && args.iter.count == cb->args[0])
5203                 args.iter.err = nft_set_catchall_dump(net, skb, set);
5204         rcu_read_unlock();
5205
5206         nla_nest_end(skb, nest);
5207         nlmsg_end(skb, nlh);
5208
5209         if (args.iter.err && args.iter.err != -EMSGSIZE)
5210                 return args.iter.err;
5211         if (args.iter.count == cb->args[0])
5212                 return 0;
5213
5214         cb->args[0] = args.iter.count;
5215         return skb->len;
5216
5217 nla_put_failure:
5218         rcu_read_unlock();
5219         return -ENOSPC;
5220 }
5221
5222 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5223 {
5224         struct nft_set_dump_ctx *dump_ctx = cb->data;
5225
5226         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5227
5228         return cb->data ? 0 : -ENOMEM;
5229 }
5230
5231 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5232 {
5233         kfree(cb->data);
5234         return 0;
5235 }
5236
5237 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5238                                        const struct nft_ctx *ctx, u32 seq,
5239                                        u32 portid, int event, u16 flags,
5240                                        const struct nft_set *set,
5241                                        const struct nft_set_elem *elem)
5242 {
5243         struct nlmsghdr *nlh;
5244         struct nlattr *nest;
5245         int err;
5246
5247         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5248         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5249                            NFNETLINK_V0, nft_base_seq(ctx->net));
5250         if (!nlh)
5251                 goto nla_put_failure;
5252
5253         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5254                 goto nla_put_failure;
5255         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5256                 goto nla_put_failure;
5257
5258         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5259         if (nest == NULL)
5260                 goto nla_put_failure;
5261
5262         err = nf_tables_fill_setelem(skb, set, elem);
5263         if (err < 0)
5264                 goto nla_put_failure;
5265
5266         nla_nest_end(skb, nest);
5267
5268         nlmsg_end(skb, nlh);
5269         return 0;
5270
5271 nla_put_failure:
5272         nlmsg_trim(skb, nlh);
5273         return -1;
5274 }
5275
5276 static int nft_setelem_parse_flags(const struct nft_set *set,
5277                                    const struct nlattr *attr, u32 *flags)
5278 {
5279         if (attr == NULL)
5280                 return 0;
5281
5282         *flags = ntohl(nla_get_be32(attr));
5283         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5284                 return -EOPNOTSUPP;
5285         if (!(set->flags & NFT_SET_INTERVAL) &&
5286             *flags & NFT_SET_ELEM_INTERVAL_END)
5287                 return -EINVAL;
5288         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5289             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5290                 return -EINVAL;
5291
5292         return 0;
5293 }
5294
5295 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5296                                  struct nft_data *key, struct nlattr *attr)
5297 {
5298         struct nft_data_desc desc = {
5299                 .type   = NFT_DATA_VALUE,
5300                 .size   = NFT_DATA_VALUE_MAXLEN,
5301                 .len    = set->klen,
5302         };
5303
5304         return nft_data_init(ctx, key, &desc, attr);
5305 }
5306
5307 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5308                                   struct nft_data_desc *desc,
5309                                   struct nft_data *data,
5310                                   struct nlattr *attr)
5311 {
5312         u32 dtype;
5313
5314         if (set->dtype == NFT_DATA_VERDICT)
5315                 dtype = NFT_DATA_VERDICT;
5316         else
5317                 dtype = NFT_DATA_VALUE;
5318
5319         desc->type = dtype;
5320         desc->size = NFT_DATA_VALUE_MAXLEN;
5321         desc->len = set->dlen;
5322         desc->flags = NFT_DATA_DESC_SETELEM;
5323
5324         return nft_data_init(ctx, data, desc, attr);
5325 }
5326
5327 static void *nft_setelem_catchall_get(const struct net *net,
5328                                       const struct nft_set *set)
5329 {
5330         struct nft_set_elem_catchall *catchall;
5331         u8 genmask = nft_genmask_cur(net);
5332         struct nft_set_ext *ext;
5333         void *priv = NULL;
5334
5335         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5336                 ext = nft_set_elem_ext(set, catchall->elem);
5337                 if (!nft_set_elem_active(ext, genmask) ||
5338                     nft_set_elem_expired(ext))
5339                         continue;
5340
5341                 priv = catchall->elem;
5342                 break;
5343         }
5344
5345         return priv;
5346 }
5347
5348 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5349                            struct nft_set_elem *elem, u32 flags)
5350 {
5351         void *priv;
5352
5353         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5354                 priv = set->ops->get(ctx->net, set, elem, flags);
5355                 if (IS_ERR(priv))
5356                         return PTR_ERR(priv);
5357         } else {
5358                 priv = nft_setelem_catchall_get(ctx->net, set);
5359                 if (!priv)
5360                         return -ENOENT;
5361         }
5362         elem->priv = priv;
5363
5364         return 0;
5365 }
5366
5367 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5368                             const struct nlattr *attr)
5369 {
5370         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5371         struct nft_set_elem elem;
5372         struct sk_buff *skb;
5373         uint32_t flags = 0;
5374         int err;
5375
5376         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5377                                           nft_set_elem_policy, NULL);
5378         if (err < 0)
5379                 return err;
5380
5381         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5382         if (err < 0)
5383                 return err;
5384
5385         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5386                 return -EINVAL;
5387
5388         if (nla[NFTA_SET_ELEM_KEY]) {
5389                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5390                                             nla[NFTA_SET_ELEM_KEY]);
5391                 if (err < 0)
5392                         return err;
5393         }
5394
5395         if (nla[NFTA_SET_ELEM_KEY_END]) {
5396                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5397                                             nla[NFTA_SET_ELEM_KEY_END]);
5398                 if (err < 0)
5399                         return err;
5400         }
5401
5402         err = nft_setelem_get(ctx, set, &elem, flags);
5403         if (err < 0)
5404                 return err;
5405
5406         err = -ENOMEM;
5407         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5408         if (skb == NULL)
5409                 return err;
5410
5411         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5412                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
5413         if (err < 0)
5414                 goto err_fill_setelem;
5415
5416         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5417
5418 err_fill_setelem:
5419         kfree_skb(skb);
5420         return err;
5421 }
5422
5423 /* called with rcu_read_lock held */
5424 static int nf_tables_getsetelem(struct sk_buff *skb,
5425                                 const struct nfnl_info *info,
5426                                 const struct nlattr * const nla[])
5427 {
5428         struct netlink_ext_ack *extack = info->extack;
5429         u8 genmask = nft_genmask_cur(info->net);
5430         u8 family = info->nfmsg->nfgen_family;
5431         struct net *net = info->net;
5432         struct nft_table *table;
5433         struct nft_set *set;
5434         struct nlattr *attr;
5435         struct nft_ctx ctx;
5436         int rem, err = 0;
5437
5438         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5439                                  genmask, NETLINK_CB(skb).portid);
5440         if (IS_ERR(table)) {
5441                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5442                 return PTR_ERR(table);
5443         }
5444
5445         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5446         if (IS_ERR(set))
5447                 return PTR_ERR(set);
5448
5449         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5450
5451         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5452                 struct netlink_dump_control c = {
5453                         .start = nf_tables_dump_set_start,
5454                         .dump = nf_tables_dump_set,
5455                         .done = nf_tables_dump_set_done,
5456                         .module = THIS_MODULE,
5457                 };
5458                 struct nft_set_dump_ctx dump_ctx = {
5459                         .set = set,
5460                         .ctx = ctx,
5461                 };
5462
5463                 c.data = &dump_ctx;
5464                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5465         }
5466
5467         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5468                 return -EINVAL;
5469
5470         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5471                 err = nft_get_set_elem(&ctx, set, attr);
5472                 if (err < 0) {
5473                         NL_SET_BAD_ATTR(extack, attr);
5474                         break;
5475                 }
5476         }
5477
5478         return err;
5479 }
5480
5481 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5482                                      const struct nft_set *set,
5483                                      const struct nft_set_elem *elem,
5484                                      int event)
5485 {
5486         struct nftables_pernet *nft_net;
5487         struct net *net = ctx->net;
5488         u32 portid = ctx->portid;
5489         struct sk_buff *skb;
5490         u16 flags = 0;
5491         int err;
5492
5493         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5494                 return;
5495
5496         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5497         if (skb == NULL)
5498                 goto err;
5499
5500         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5501                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5502
5503         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5504                                           set, elem);
5505         if (err < 0) {
5506                 kfree_skb(skb);
5507                 goto err;
5508         }
5509
5510         nft_net = nft_pernet(net);
5511         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5512         return;
5513 err:
5514         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5515 }
5516
5517 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5518                                               int msg_type,
5519                                               struct nft_set *set)
5520 {
5521         struct nft_trans *trans;
5522
5523         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5524         if (trans == NULL)
5525                 return NULL;
5526
5527         nft_trans_elem_set(trans) = set;
5528         return trans;
5529 }
5530
5531 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5532                                          const struct nft_set *set,
5533                                          const struct nlattr *attr)
5534 {
5535         struct nft_expr *expr;
5536         int err;
5537
5538         expr = nft_expr_init(ctx, attr);
5539         if (IS_ERR(expr))
5540                 return expr;
5541
5542         err = -EOPNOTSUPP;
5543         if (expr->ops->type->flags & NFT_EXPR_GC) {
5544                 if (set->flags & NFT_SET_TIMEOUT)
5545                         goto err_set_elem_expr;
5546                 if (!set->ops->gc_init)
5547                         goto err_set_elem_expr;
5548                 set->ops->gc_init(set);
5549         }
5550
5551         return expr;
5552
5553 err_set_elem_expr:
5554         nft_expr_destroy(ctx, expr);
5555         return ERR_PTR(err);
5556 }
5557
5558 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
5559 {
5560         len += nft_set_ext_types[id].len;
5561         if (len > tmpl->ext_len[id] ||
5562             len > U8_MAX)
5563                 return -1;
5564
5565         return 0;
5566 }
5567
5568 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
5569                               void *to, const void *from, u32 len)
5570 {
5571         if (nft_set_ext_check(tmpl, id, len) < 0)
5572                 return -1;
5573
5574         memcpy(to, from, len);
5575
5576         return 0;
5577 }
5578
5579 void *nft_set_elem_init(const struct nft_set *set,
5580                         const struct nft_set_ext_tmpl *tmpl,
5581                         const u32 *key, const u32 *key_end,
5582                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5583 {
5584         struct nft_set_ext *ext;
5585         void *elem;
5586
5587         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5588         if (elem == NULL)
5589                 return ERR_PTR(-ENOMEM);
5590
5591         ext = nft_set_elem_ext(set, elem);
5592         nft_set_ext_init(ext, tmpl);
5593
5594         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5595             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
5596                                nft_set_ext_key(ext), key, set->klen) < 0)
5597                 goto err_ext_check;
5598
5599         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5600             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
5601                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
5602                 goto err_ext_check;
5603
5604         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5605             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
5606                                nft_set_ext_data(ext), data, set->dlen) < 0)
5607                 goto err_ext_check;
5608
5609         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5610                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5611                 if (expiration == 0)
5612                         *nft_set_ext_expiration(ext) += timeout;
5613         }
5614         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5615                 *nft_set_ext_timeout(ext) = timeout;
5616
5617         return elem;
5618
5619 err_ext_check:
5620         kfree(elem);
5621
5622         return ERR_PTR(-EINVAL);
5623 }
5624
5625 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5626                                         struct nft_expr *expr)
5627 {
5628         if (expr->ops->destroy_clone) {
5629                 expr->ops->destroy_clone(ctx, expr);
5630                 module_put(expr->ops->type->owner);
5631         } else {
5632                 nf_tables_expr_destroy(ctx, expr);
5633         }
5634 }
5635
5636 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5637                                       struct nft_set_elem_expr *elem_expr)
5638 {
5639         struct nft_expr *expr;
5640         u32 size;
5641
5642         nft_setelem_expr_foreach(expr, elem_expr, size)
5643                 __nft_set_elem_expr_destroy(ctx, expr);
5644 }
5645
5646 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5647                           bool destroy_expr)
5648 {
5649         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5650         struct nft_ctx ctx = {
5651                 .net    = read_pnet(&set->net),
5652                 .family = set->table->family,
5653         };
5654
5655         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5656         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5657                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5658         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5659                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5660
5661         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5662                 (*nft_set_ext_obj(ext))->use--;
5663         kfree(elem);
5664 }
5665 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5666
5667 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5668  * with the refcounting from the preparation phase.
5669  */
5670 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5671                                        const struct nft_set *set, void *elem)
5672 {
5673         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5674
5675         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5676                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5677
5678         kfree(elem);
5679 }
5680
5681 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5682                             struct nft_expr *expr_array[])
5683 {
5684         struct nft_expr *expr;
5685         int err, i, k;
5686
5687         for (i = 0; i < set->num_exprs; i++) {
5688                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
5689                 if (!expr)
5690                         goto err_expr;
5691
5692                 err = nft_expr_clone(expr, set->exprs[i]);
5693                 if (err < 0) {
5694                         kfree(expr);
5695                         goto err_expr;
5696                 }
5697                 expr_array[i] = expr;
5698         }
5699
5700         return 0;
5701
5702 err_expr:
5703         for (k = i - 1; k >= 0; k--)
5704                 nft_expr_destroy(ctx, expr_array[k]);
5705
5706         return -ENOMEM;
5707 }
5708
5709 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5710                                    const struct nft_set_ext_tmpl *tmpl,
5711                                    const struct nft_set_ext *ext,
5712                                    struct nft_expr *expr_array[],
5713                                    u32 num_exprs)
5714 {
5715         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5716         u32 len = sizeof(struct nft_set_elem_expr);
5717         struct nft_expr *expr;
5718         int i, err;
5719
5720         if (num_exprs == 0)
5721                 return 0;
5722
5723         for (i = 0; i < num_exprs; i++)
5724                 len += expr_array[i]->ops->size;
5725
5726         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
5727                 return -EINVAL;
5728
5729         for (i = 0; i < num_exprs; i++) {
5730                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5731                 err = nft_expr_clone(expr, expr_array[i]);
5732                 if (err < 0)
5733                         goto err_elem_expr_setup;
5734
5735                 elem_expr->size += expr_array[i]->ops->size;
5736                 nft_expr_destroy(ctx, expr_array[i]);
5737                 expr_array[i] = NULL;
5738         }
5739
5740         return 0;
5741
5742 err_elem_expr_setup:
5743         for (; i < num_exprs; i++) {
5744                 nft_expr_destroy(ctx, expr_array[i]);
5745                 expr_array[i] = NULL;
5746         }
5747
5748         return -ENOMEM;
5749 }
5750
5751 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5752                                             const struct nft_set *set)
5753 {
5754         struct nft_set_elem_catchall *catchall;
5755         u8 genmask = nft_genmask_cur(net);
5756         struct nft_set_ext *ext;
5757
5758         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5759                 ext = nft_set_elem_ext(set, catchall->elem);
5760                 if (nft_set_elem_active(ext, genmask) &&
5761                     !nft_set_elem_expired(ext))
5762                         return ext;
5763         }
5764
5765         return NULL;
5766 }
5767 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5768
5769 void *nft_set_catchall_gc(const struct nft_set *set)
5770 {
5771         struct nft_set_elem_catchall *catchall, *next;
5772         struct nft_set_ext *ext;
5773         void *elem = NULL;
5774
5775         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5776                 ext = nft_set_elem_ext(set, catchall->elem);
5777
5778                 if (!nft_set_elem_expired(ext) ||
5779                     nft_set_elem_mark_busy(ext))
5780                         continue;
5781
5782                 elem = catchall->elem;
5783                 list_del_rcu(&catchall->list);
5784                 kfree_rcu(catchall, rcu);
5785                 break;
5786         }
5787
5788         return elem;
5789 }
5790 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5791
5792 static int nft_setelem_catchall_insert(const struct net *net,
5793                                        struct nft_set *set,
5794                                        const struct nft_set_elem *elem,
5795                                        struct nft_set_ext **pext)
5796 {
5797         struct nft_set_elem_catchall *catchall;
5798         u8 genmask = nft_genmask_next(net);
5799         struct nft_set_ext *ext;
5800
5801         list_for_each_entry(catchall, &set->catchall_list, list) {
5802                 ext = nft_set_elem_ext(set, catchall->elem);
5803                 if (nft_set_elem_active(ext, genmask)) {
5804                         *pext = ext;
5805                         return -EEXIST;
5806                 }
5807         }
5808
5809         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5810         if (!catchall)
5811                 return -ENOMEM;
5812
5813         catchall->elem = elem->priv;
5814         list_add_tail_rcu(&catchall->list, &set->catchall_list);
5815
5816         return 0;
5817 }
5818
5819 static int nft_setelem_insert(const struct net *net,
5820                               struct nft_set *set,
5821                               const struct nft_set_elem *elem,
5822                               struct nft_set_ext **ext, unsigned int flags)
5823 {
5824         int ret;
5825
5826         if (flags & NFT_SET_ELEM_CATCHALL)
5827                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5828         else
5829                 ret = set->ops->insert(net, set, elem, ext);
5830
5831         return ret;
5832 }
5833
5834 static bool nft_setelem_is_catchall(const struct nft_set *set,
5835                                     const struct nft_set_elem *elem)
5836 {
5837         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5838
5839         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5840             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5841                 return true;
5842
5843         return false;
5844 }
5845
5846 static void nft_setelem_activate(struct net *net, struct nft_set *set,
5847                                  struct nft_set_elem *elem)
5848 {
5849         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5850
5851         if (nft_setelem_is_catchall(set, elem)) {
5852                 nft_set_elem_change_active(net, set, ext);
5853                 nft_set_elem_clear_busy(ext);
5854         } else {
5855                 set->ops->activate(net, set, elem);
5856         }
5857 }
5858
5859 static int nft_setelem_catchall_deactivate(const struct net *net,
5860                                            struct nft_set *set,
5861                                            struct nft_set_elem *elem)
5862 {
5863         struct nft_set_elem_catchall *catchall;
5864         struct nft_set_ext *ext;
5865
5866         list_for_each_entry(catchall, &set->catchall_list, list) {
5867                 ext = nft_set_elem_ext(set, catchall->elem);
5868                 if (!nft_is_active(net, ext) ||
5869                     nft_set_elem_mark_busy(ext))
5870                         continue;
5871
5872                 kfree(elem->priv);
5873                 elem->priv = catchall->elem;
5874                 nft_set_elem_change_active(net, set, ext);
5875                 return 0;
5876         }
5877
5878         return -ENOENT;
5879 }
5880
5881 static int __nft_setelem_deactivate(const struct net *net,
5882                                     struct nft_set *set,
5883                                     struct nft_set_elem *elem)
5884 {
5885         void *priv;
5886
5887         priv = set->ops->deactivate(net, set, elem);
5888         if (!priv)
5889                 return -ENOENT;
5890
5891         kfree(elem->priv);
5892         elem->priv = priv;
5893         set->ndeact++;
5894
5895         return 0;
5896 }
5897
5898 static int nft_setelem_deactivate(const struct net *net,
5899                                   struct nft_set *set,
5900                                   struct nft_set_elem *elem, u32 flags)
5901 {
5902         int ret;
5903
5904         if (flags & NFT_SET_ELEM_CATCHALL)
5905                 ret = nft_setelem_catchall_deactivate(net, set, elem);
5906         else
5907                 ret = __nft_setelem_deactivate(net, set, elem);
5908
5909         return ret;
5910 }
5911
5912 static void nft_setelem_catchall_remove(const struct net *net,
5913                                         const struct nft_set *set,
5914                                         const struct nft_set_elem *elem)
5915 {
5916         struct nft_set_elem_catchall *catchall, *next;
5917
5918         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5919                 if (catchall->elem == elem->priv) {
5920                         list_del_rcu(&catchall->list);
5921                         kfree_rcu(catchall, rcu);
5922                         break;
5923                 }
5924         }
5925 }
5926
5927 static void nft_setelem_remove(const struct net *net,
5928                                const struct nft_set *set,
5929                                const struct nft_set_elem *elem)
5930 {
5931         if (nft_setelem_is_catchall(set, elem))
5932                 nft_setelem_catchall_remove(net, set, elem);
5933         else
5934                 set->ops->remove(net, set, elem);
5935 }
5936
5937 static bool nft_setelem_valid_key_end(const struct nft_set *set,
5938                                       struct nlattr **nla, u32 flags)
5939 {
5940         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
5941                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
5942                 if (flags & NFT_SET_ELEM_INTERVAL_END)
5943                         return false;
5944
5945                 if (nla[NFTA_SET_ELEM_KEY_END] &&
5946                     flags & NFT_SET_ELEM_CATCHALL)
5947                         return false;
5948         } else {
5949                 if (nla[NFTA_SET_ELEM_KEY_END])
5950                         return false;
5951         }
5952
5953         return true;
5954 }
5955
5956 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5957                             const struct nlattr *attr, u32 nlmsg_flags)
5958 {
5959         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5960         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5961         u8 genmask = nft_genmask_next(ctx->net);
5962         u32 flags = 0, size = 0, num_exprs = 0;
5963         struct nft_set_ext_tmpl tmpl;
5964         struct nft_set_ext *ext, *ext2;
5965         struct nft_set_elem elem;
5966         struct nft_set_binding *binding;
5967         struct nft_object *obj = NULL;
5968         struct nft_userdata *udata;
5969         struct nft_data_desc desc;
5970         enum nft_registers dreg;
5971         struct nft_trans *trans;
5972         u64 timeout;
5973         u64 expiration;
5974         int err, i;
5975         u8 ulen;
5976
5977         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5978                                           nft_set_elem_policy, NULL);
5979         if (err < 0)
5980                 return err;
5981
5982         nft_set_ext_prepare(&tmpl);
5983
5984         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5985         if (err < 0)
5986                 return err;
5987
5988         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5989                 return -EINVAL;
5990
5991         if (flags != 0) {
5992                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5993                 if (err < 0)
5994                         return err;
5995         }
5996
5997         if (set->flags & NFT_SET_MAP) {
5998                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5999                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6000                         return -EINVAL;
6001         } else {
6002                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6003                         return -EINVAL;
6004         }
6005
6006         if (set->flags & NFT_SET_OBJECT) {
6007                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6008                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6009                         return -EINVAL;
6010         } else {
6011                 if (nla[NFTA_SET_ELEM_OBJREF])
6012                         return -EINVAL;
6013         }
6014
6015         if (!nft_setelem_valid_key_end(set, nla, flags))
6016                 return -EINVAL;
6017
6018         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6019              (nla[NFTA_SET_ELEM_DATA] ||
6020               nla[NFTA_SET_ELEM_OBJREF] ||
6021               nla[NFTA_SET_ELEM_TIMEOUT] ||
6022               nla[NFTA_SET_ELEM_EXPIRATION] ||
6023               nla[NFTA_SET_ELEM_USERDATA] ||
6024               nla[NFTA_SET_ELEM_EXPR] ||
6025               nla[NFTA_SET_ELEM_KEY_END] ||
6026               nla[NFTA_SET_ELEM_EXPRESSIONS]))
6027                 return -EINVAL;
6028
6029         timeout = 0;
6030         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6031                 if (!(set->flags & NFT_SET_TIMEOUT))
6032                         return -EINVAL;
6033                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6034                                             &timeout);
6035                 if (err)
6036                         return err;
6037         } else if (set->flags & NFT_SET_TIMEOUT &&
6038                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6039                 timeout = set->timeout;
6040         }
6041
6042         expiration = 0;
6043         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6044                 if (!(set->flags & NFT_SET_TIMEOUT))
6045                         return -EINVAL;
6046                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6047                                             &expiration);
6048                 if (err)
6049                         return err;
6050         }
6051
6052         if (nla[NFTA_SET_ELEM_EXPR]) {
6053                 struct nft_expr *expr;
6054
6055                 if (set->num_exprs && set->num_exprs != 1)
6056                         return -EOPNOTSUPP;
6057
6058                 expr = nft_set_elem_expr_alloc(ctx, set,
6059                                                nla[NFTA_SET_ELEM_EXPR]);
6060                 if (IS_ERR(expr))
6061                         return PTR_ERR(expr);
6062
6063                 expr_array[0] = expr;
6064                 num_exprs = 1;
6065
6066                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6067                         err = -EOPNOTSUPP;
6068                         goto err_set_elem_expr;
6069                 }
6070         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6071                 struct nft_expr *expr;
6072                 struct nlattr *tmp;
6073                 int left;
6074
6075                 i = 0;
6076                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6077                         if (i == NFT_SET_EXPR_MAX ||
6078                             (set->num_exprs && set->num_exprs == i)) {
6079                                 err = -E2BIG;
6080                                 goto err_set_elem_expr;
6081                         }
6082                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6083                                 err = -EINVAL;
6084                                 goto err_set_elem_expr;
6085                         }
6086                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6087                         if (IS_ERR(expr)) {
6088                                 err = PTR_ERR(expr);
6089                                 goto err_set_elem_expr;
6090                         }
6091                         expr_array[i] = expr;
6092                         num_exprs++;
6093
6094                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6095                                 err = -EOPNOTSUPP;
6096                                 goto err_set_elem_expr;
6097                         }
6098                         i++;
6099                 }
6100                 if (set->num_exprs && set->num_exprs != i) {
6101                         err = -EOPNOTSUPP;
6102                         goto err_set_elem_expr;
6103                 }
6104         } else if (set->num_exprs > 0 &&
6105                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6106                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6107                 if (err < 0)
6108                         goto err_set_elem_expr_clone;
6109
6110                 num_exprs = set->num_exprs;
6111         }
6112
6113         if (nla[NFTA_SET_ELEM_KEY]) {
6114                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6115                                             nla[NFTA_SET_ELEM_KEY]);
6116                 if (err < 0)
6117                         goto err_set_elem_expr;
6118
6119                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6120                 if (err < 0)
6121                         goto err_parse_key;
6122         }
6123
6124         if (nla[NFTA_SET_ELEM_KEY_END]) {
6125                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6126                                             nla[NFTA_SET_ELEM_KEY_END]);
6127                 if (err < 0)
6128                         goto err_parse_key;
6129
6130                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6131                 if (err < 0)
6132                         goto err_parse_key_end;
6133         }
6134
6135         if (timeout > 0) {
6136                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6137                 if (err < 0)
6138                         goto err_parse_key_end;
6139
6140                 if (timeout != set->timeout) {
6141                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6142                         if (err < 0)
6143                                 goto err_parse_key_end;
6144                 }
6145         }
6146
6147         if (num_exprs) {
6148                 for (i = 0; i < num_exprs; i++)
6149                         size += expr_array[i]->ops->size;
6150
6151                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6152                                              sizeof(struct nft_set_elem_expr) + size);
6153                 if (err < 0)
6154                         goto err_parse_key_end;
6155         }
6156
6157         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6158                 obj = nft_obj_lookup(ctx->net, ctx->table,
6159                                      nla[NFTA_SET_ELEM_OBJREF],
6160                                      set->objtype, genmask);
6161                 if (IS_ERR(obj)) {
6162                         err = PTR_ERR(obj);
6163                         goto err_parse_key_end;
6164                 }
6165                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6166                 if (err < 0)
6167                         goto err_parse_key_end;
6168         }
6169
6170         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6171                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6172                                              nla[NFTA_SET_ELEM_DATA]);
6173                 if (err < 0)
6174                         goto err_parse_key_end;
6175
6176                 dreg = nft_type_to_reg(set->dtype);
6177                 list_for_each_entry(binding, &set->bindings, list) {
6178                         struct nft_ctx bind_ctx = {
6179                                 .net    = ctx->net,
6180                                 .family = ctx->family,
6181                                 .table  = ctx->table,
6182                                 .chain  = (struct nft_chain *)binding->chain,
6183                         };
6184
6185                         if (!(binding->flags & NFT_SET_MAP))
6186                                 continue;
6187
6188                         err = nft_validate_register_store(&bind_ctx, dreg,
6189                                                           &elem.data.val,
6190                                                           desc.type, desc.len);
6191                         if (err < 0)
6192                                 goto err_parse_data;
6193
6194                         if (desc.type == NFT_DATA_VERDICT &&
6195                             (elem.data.val.verdict.code == NFT_GOTO ||
6196                              elem.data.val.verdict.code == NFT_JUMP))
6197                                 nft_validate_state_update(ctx->net,
6198                                                           NFT_VALIDATE_NEED);
6199                 }
6200
6201                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6202                 if (err < 0)
6203                         goto err_parse_data;
6204         }
6205
6206         /* The full maximum length of userdata can exceed the maximum
6207          * offset value (U8_MAX) for following extensions, therefor it
6208          * must be the last extension added.
6209          */
6210         ulen = 0;
6211         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6212                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6213                 if (ulen > 0) {
6214                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6215                                                      ulen);
6216                         if (err < 0)
6217                                 goto err_parse_data;
6218                 }
6219         }
6220
6221         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6222                                       elem.key_end.val.data, elem.data.val.data,
6223                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6224         if (IS_ERR(elem.priv)) {
6225                 err = PTR_ERR(elem.priv);
6226                 goto err_parse_data;
6227         }
6228
6229         ext = nft_set_elem_ext(set, elem.priv);
6230         if (flags)
6231                 *nft_set_ext_flags(ext) = flags;
6232
6233         if (ulen > 0) {
6234                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6235                         err = -EINVAL;
6236                         goto err_elem_userdata;
6237                 }
6238                 udata = nft_set_ext_userdata(ext);
6239                 udata->len = ulen - 1;
6240                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6241         }
6242         if (obj) {
6243                 *nft_set_ext_obj(ext) = obj;
6244                 obj->use++;
6245         }
6246         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6247         if (err < 0)
6248                 goto err_elem_free;
6249
6250         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6251         if (trans == NULL) {
6252                 err = -ENOMEM;
6253                 goto err_elem_free;
6254         }
6255
6256         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6257
6258         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6259         if (err) {
6260                 if (err == -EEXIST) {
6261                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6262                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6263                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6264                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6265                                 goto err_element_clash;
6266                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6267                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6268                              memcmp(nft_set_ext_data(ext),
6269                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6270                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6271                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6272                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6273                                 goto err_element_clash;
6274                         else if (!(nlmsg_flags & NLM_F_EXCL))
6275                                 err = 0;
6276                 } else if (err == -ENOTEMPTY) {
6277                         /* ENOTEMPTY reports overlapping between this element
6278                          * and an existing one.
6279                          */
6280                         err = -EEXIST;
6281                 }
6282                 goto err_element_clash;
6283         }
6284
6285         if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6286             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6287                 err = -ENFILE;
6288                 goto err_set_full;
6289         }
6290
6291         nft_trans_elem(trans) = elem;
6292         nft_trans_commit_list_add_tail(ctx->net, trans);
6293         return 0;
6294
6295 err_set_full:
6296         nft_setelem_remove(ctx->net, set, &elem);
6297 err_element_clash:
6298         kfree(trans);
6299 err_elem_free:
6300         if (obj)
6301                 obj->use--;
6302 err_elem_userdata:
6303         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6304 err_parse_data:
6305         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6306                 nft_data_release(&elem.data.val, desc.type);
6307 err_parse_key_end:
6308         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6309 err_parse_key:
6310         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6311 err_set_elem_expr:
6312         for (i = 0; i < num_exprs && expr_array[i]; i++)
6313                 nft_expr_destroy(ctx, expr_array[i]);
6314 err_set_elem_expr_clone:
6315         return err;
6316 }
6317
6318 static int nf_tables_newsetelem(struct sk_buff *skb,
6319                                 const struct nfnl_info *info,
6320                                 const struct nlattr * const nla[])
6321 {
6322         struct nftables_pernet *nft_net = nft_pernet(info->net);
6323         struct netlink_ext_ack *extack = info->extack;
6324         u8 genmask = nft_genmask_next(info->net);
6325         u8 family = info->nfmsg->nfgen_family;
6326         struct net *net = info->net;
6327         const struct nlattr *attr;
6328         struct nft_table *table;
6329         struct nft_set *set;
6330         struct nft_ctx ctx;
6331         int rem, err;
6332
6333         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6334                 return -EINVAL;
6335
6336         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6337                                  genmask, NETLINK_CB(skb).portid);
6338         if (IS_ERR(table)) {
6339                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6340                 return PTR_ERR(table);
6341         }
6342
6343         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6344                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6345         if (IS_ERR(set))
6346                 return PTR_ERR(set);
6347
6348         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6349                 return -EBUSY;
6350
6351         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6352
6353         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6354                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6355                 if (err < 0) {
6356                         NL_SET_BAD_ATTR(extack, attr);
6357                         return err;
6358                 }
6359         }
6360
6361         if (nft_net->validate_state == NFT_VALIDATE_DO)
6362                 return nft_table_validate(net, table);
6363
6364         return 0;
6365 }
6366
6367 /**
6368  *      nft_data_hold - hold a nft_data item
6369  *
6370  *      @data: struct nft_data to release
6371  *      @type: type of data
6372  *
6373  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6374  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6375  *      NFT_GOTO verdicts. This function must be called on active data objects
6376  *      from the second phase of the commit protocol.
6377  */
6378 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6379 {
6380         struct nft_chain *chain;
6381         struct nft_rule *rule;
6382
6383         if (type == NFT_DATA_VERDICT) {
6384                 switch (data->verdict.code) {
6385                 case NFT_JUMP:
6386                 case NFT_GOTO:
6387                         chain = data->verdict.chain;
6388                         chain->use++;
6389
6390                         if (!nft_chain_is_bound(chain))
6391                                 break;
6392
6393                         chain->table->use++;
6394                         list_for_each_entry(rule, &chain->rules, list)
6395                                 chain->use++;
6396
6397                         nft_chain_add(chain->table, chain);
6398                         break;
6399                 }
6400         }
6401 }
6402
6403 static void nft_setelem_data_activate(const struct net *net,
6404                                       const struct nft_set *set,
6405                                       struct nft_set_elem *elem)
6406 {
6407         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6408
6409         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6410                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6411         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6412                 (*nft_set_ext_obj(ext))->use++;
6413 }
6414
6415 static void nft_setelem_data_deactivate(const struct net *net,
6416                                         const struct nft_set *set,
6417                                         struct nft_set_elem *elem)
6418 {
6419         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6420
6421         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6422                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6423         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6424                 (*nft_set_ext_obj(ext))->use--;
6425 }
6426
6427 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6428                            const struct nlattr *attr)
6429 {
6430         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6431         struct nft_set_ext_tmpl tmpl;
6432         struct nft_set_elem elem;
6433         struct nft_set_ext *ext;
6434         struct nft_trans *trans;
6435         u32 flags = 0;
6436         int err;
6437
6438         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6439                                           nft_set_elem_policy, NULL);
6440         if (err < 0)
6441                 return err;
6442
6443         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6444         if (err < 0)
6445                 return err;
6446
6447         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6448                 return -EINVAL;
6449
6450         if (!nft_setelem_valid_key_end(set, nla, flags))
6451                 return -EINVAL;
6452
6453         nft_set_ext_prepare(&tmpl);
6454
6455         if (flags != 0) {
6456                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6457                 if (err < 0)
6458                         return err;
6459         }
6460
6461         if (nla[NFTA_SET_ELEM_KEY]) {
6462                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6463                                             nla[NFTA_SET_ELEM_KEY]);
6464                 if (err < 0)
6465                         return err;
6466
6467                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6468                 if (err < 0)
6469                         goto fail_elem;
6470         }
6471
6472         if (nla[NFTA_SET_ELEM_KEY_END]) {
6473                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6474                                             nla[NFTA_SET_ELEM_KEY_END]);
6475                 if (err < 0)
6476                         goto fail_elem;
6477
6478                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6479                 if (err < 0)
6480                         goto fail_elem_key_end;
6481         }
6482
6483         err = -ENOMEM;
6484         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6485                                       elem.key_end.val.data, NULL, 0, 0,
6486                                       GFP_KERNEL_ACCOUNT);
6487         if (IS_ERR(elem.priv)) {
6488                 err = PTR_ERR(elem.priv);
6489                 goto fail_elem_key_end;
6490         }
6491
6492         ext = nft_set_elem_ext(set, elem.priv);
6493         if (flags)
6494                 *nft_set_ext_flags(ext) = flags;
6495
6496         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6497         if (trans == NULL)
6498                 goto fail_trans;
6499
6500         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6501         if (err < 0)
6502                 goto fail_ops;
6503
6504         nft_setelem_data_deactivate(ctx->net, set, &elem);
6505
6506         nft_trans_elem(trans) = elem;
6507         nft_trans_commit_list_add_tail(ctx->net, trans);
6508         return 0;
6509
6510 fail_ops:
6511         kfree(trans);
6512 fail_trans:
6513         kfree(elem.priv);
6514 fail_elem_key_end:
6515         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6516 fail_elem:
6517         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6518         return err;
6519 }
6520
6521 static int nft_setelem_flush(const struct nft_ctx *ctx,
6522                              struct nft_set *set,
6523                              const struct nft_set_iter *iter,
6524                              struct nft_set_elem *elem)
6525 {
6526         struct nft_trans *trans;
6527         int err;
6528
6529         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6530                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
6531         if (!trans)
6532                 return -ENOMEM;
6533
6534         if (!set->ops->flush(ctx->net, set, elem->priv)) {
6535                 err = -ENOENT;
6536                 goto err1;
6537         }
6538         set->ndeact++;
6539
6540         nft_setelem_data_deactivate(ctx->net, set, elem);
6541         nft_trans_elem_set(trans) = set;
6542         nft_trans_elem(trans) = *elem;
6543         nft_trans_commit_list_add_tail(ctx->net, trans);
6544
6545         return 0;
6546 err1:
6547         kfree(trans);
6548         return err;
6549 }
6550
6551 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6552                                     struct nft_set *set,
6553                                     struct nft_set_elem *elem)
6554 {
6555         struct nft_trans *trans;
6556
6557         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6558                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
6559         if (!trans)
6560                 return -ENOMEM;
6561
6562         nft_setelem_data_deactivate(ctx->net, set, elem);
6563         nft_trans_elem_set(trans) = set;
6564         nft_trans_elem(trans) = *elem;
6565         nft_trans_commit_list_add_tail(ctx->net, trans);
6566
6567         return 0;
6568 }
6569
6570 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6571                                   struct nft_set *set)
6572 {
6573         u8 genmask = nft_genmask_next(ctx->net);
6574         struct nft_set_elem_catchall *catchall;
6575         struct nft_set_elem elem;
6576         struct nft_set_ext *ext;
6577         int ret = 0;
6578
6579         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6580                 ext = nft_set_elem_ext(set, catchall->elem);
6581                 if (!nft_set_elem_active(ext, genmask) ||
6582                     nft_set_elem_mark_busy(ext))
6583                         continue;
6584
6585                 elem.priv = catchall->elem;
6586                 ret = __nft_set_catchall_flush(ctx, set, &elem);
6587                 if (ret < 0)
6588                         break;
6589         }
6590
6591         return ret;
6592 }
6593
6594 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6595 {
6596         struct nft_set_iter iter = {
6597                 .genmask        = genmask,
6598                 .fn             = nft_setelem_flush,
6599         };
6600
6601         set->ops->walk(ctx, set, &iter);
6602         if (!iter.err)
6603                 iter.err = nft_set_catchall_flush(ctx, set);
6604
6605         return iter.err;
6606 }
6607
6608 static int nf_tables_delsetelem(struct sk_buff *skb,
6609                                 const struct nfnl_info *info,
6610                                 const struct nlattr * const nla[])
6611 {
6612         struct netlink_ext_ack *extack = info->extack;
6613         u8 genmask = nft_genmask_next(info->net);
6614         u8 family = info->nfmsg->nfgen_family;
6615         struct net *net = info->net;
6616         const struct nlattr *attr;
6617         struct nft_table *table;
6618         struct nft_set *set;
6619         struct nft_ctx ctx;
6620         int rem, err = 0;
6621
6622         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6623                                  genmask, NETLINK_CB(skb).portid);
6624         if (IS_ERR(table)) {
6625                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6626                 return PTR_ERR(table);
6627         }
6628
6629         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6630         if (IS_ERR(set))
6631                 return PTR_ERR(set);
6632         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6633                 return -EBUSY;
6634
6635         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6636
6637         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6638                 return nft_set_flush(&ctx, set, genmask);
6639
6640         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6641                 err = nft_del_setelem(&ctx, set, attr);
6642                 if (err < 0) {
6643                         NL_SET_BAD_ATTR(extack, attr);
6644                         break;
6645                 }
6646         }
6647         return err;
6648 }
6649
6650 void nft_set_gc_batch_release(struct rcu_head *rcu)
6651 {
6652         struct nft_set_gc_batch *gcb;
6653         unsigned int i;
6654
6655         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6656         for (i = 0; i < gcb->head.cnt; i++)
6657                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6658         kfree(gcb);
6659 }
6660
6661 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6662                                                 gfp_t gfp)
6663 {
6664         struct nft_set_gc_batch *gcb;
6665
6666         gcb = kzalloc(sizeof(*gcb), gfp);
6667         if (gcb == NULL)
6668                 return gcb;
6669         gcb->head.set = set;
6670         return gcb;
6671 }
6672
6673 /*
6674  * Stateful objects
6675  */
6676
6677 /**
6678  *      nft_register_obj- register nf_tables stateful object type
6679  *      @obj_type: object type
6680  *
6681  *      Registers the object type for use with nf_tables. Returns zero on
6682  *      success or a negative errno code otherwise.
6683  */
6684 int nft_register_obj(struct nft_object_type *obj_type)
6685 {
6686         if (obj_type->type == NFT_OBJECT_UNSPEC)
6687                 return -EINVAL;
6688
6689         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6690         list_add_rcu(&obj_type->list, &nf_tables_objects);
6691         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6692         return 0;
6693 }
6694 EXPORT_SYMBOL_GPL(nft_register_obj);
6695
6696 /**
6697  *      nft_unregister_obj - unregister nf_tables object type
6698  *      @obj_type: object type
6699  *
6700  *      Unregisters the object type for use with nf_tables.
6701  */
6702 void nft_unregister_obj(struct nft_object_type *obj_type)
6703 {
6704         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6705         list_del_rcu(&obj_type->list);
6706         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6707 }
6708 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6709
6710 struct nft_object *nft_obj_lookup(const struct net *net,
6711                                   const struct nft_table *table,
6712                                   const struct nlattr *nla, u32 objtype,
6713                                   u8 genmask)
6714 {
6715         struct nft_object_hash_key k = { .table = table };
6716         char search[NFT_OBJ_MAXNAMELEN];
6717         struct rhlist_head *tmp, *list;
6718         struct nft_object *obj;
6719
6720         nla_strscpy(search, nla, sizeof(search));
6721         k.name = search;
6722
6723         WARN_ON_ONCE(!rcu_read_lock_held() &&
6724                      !lockdep_commit_lock_is_held(net));
6725
6726         rcu_read_lock();
6727         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6728         if (!list)
6729                 goto out;
6730
6731         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6732                 if (objtype == obj->ops->type->type &&
6733                     nft_active_genmask(obj, genmask)) {
6734                         rcu_read_unlock();
6735                         return obj;
6736                 }
6737         }
6738 out:
6739         rcu_read_unlock();
6740         return ERR_PTR(-ENOENT);
6741 }
6742 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6743
6744 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6745                                                   const struct nlattr *nla,
6746                                                   u32 objtype, u8 genmask)
6747 {
6748         struct nft_object *obj;
6749
6750         list_for_each_entry(obj, &table->objects, list) {
6751                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6752                     objtype == obj->ops->type->type &&
6753                     nft_active_genmask(obj, genmask))
6754                         return obj;
6755         }
6756         return ERR_PTR(-ENOENT);
6757 }
6758
6759 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6760         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
6761                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
6762         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
6763                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
6764         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
6765         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
6766         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
6767         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
6768                                     .len = NFT_USERDATA_MAXLEN },
6769 };
6770
6771 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6772                                        const struct nft_object_type *type,
6773                                        const struct nlattr *attr)
6774 {
6775         struct nlattr **tb;
6776         const struct nft_object_ops *ops;
6777         struct nft_object *obj;
6778         int err = -ENOMEM;
6779
6780         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6781         if (!tb)
6782                 goto err1;
6783
6784         if (attr) {
6785                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6786                                                   type->policy, NULL);
6787                 if (err < 0)
6788                         goto err2;
6789         } else {
6790                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6791         }
6792
6793         if (type->select_ops) {
6794                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6795                 if (IS_ERR(ops)) {
6796                         err = PTR_ERR(ops);
6797                         goto err2;
6798                 }
6799         } else {
6800                 ops = type->ops;
6801         }
6802
6803         err = -ENOMEM;
6804         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
6805         if (!obj)
6806                 goto err2;
6807
6808         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6809         if (err < 0)
6810                 goto err3;
6811
6812         obj->ops = ops;
6813
6814         kfree(tb);
6815         return obj;
6816 err3:
6817         kfree(obj);
6818 err2:
6819         kfree(tb);
6820 err1:
6821         return ERR_PTR(err);
6822 }
6823
6824 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6825                            struct nft_object *obj, bool reset)
6826 {
6827         struct nlattr *nest;
6828
6829         nest = nla_nest_start_noflag(skb, attr);
6830         if (!nest)
6831                 goto nla_put_failure;
6832         if (obj->ops->dump(skb, obj, reset) < 0)
6833                 goto nla_put_failure;
6834         nla_nest_end(skb, nest);
6835         return 0;
6836
6837 nla_put_failure:
6838         return -1;
6839 }
6840
6841 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6842 {
6843         const struct nft_object_type *type;
6844
6845         list_for_each_entry(type, &nf_tables_objects, list) {
6846                 if (objtype == type->type)
6847                         return type;
6848         }
6849         return NULL;
6850 }
6851
6852 static const struct nft_object_type *
6853 nft_obj_type_get(struct net *net, u32 objtype)
6854 {
6855         const struct nft_object_type *type;
6856
6857         type = __nft_obj_type_get(objtype);
6858         if (type != NULL && try_module_get(type->owner))
6859                 return type;
6860
6861         lockdep_nfnl_nft_mutex_not_held();
6862 #ifdef CONFIG_MODULES
6863         if (type == NULL) {
6864                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6865                         return ERR_PTR(-EAGAIN);
6866         }
6867 #endif
6868         return ERR_PTR(-ENOENT);
6869 }
6870
6871 static int nf_tables_updobj(const struct nft_ctx *ctx,
6872                             const struct nft_object_type *type,
6873                             const struct nlattr *attr,
6874                             struct nft_object *obj)
6875 {
6876         struct nft_object *newobj;
6877         struct nft_trans *trans;
6878         int err = -ENOMEM;
6879
6880         if (!try_module_get(type->owner))
6881                 return -ENOENT;
6882
6883         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6884                                 sizeof(struct nft_trans_obj));
6885         if (!trans)
6886                 goto err_trans;
6887
6888         newobj = nft_obj_init(ctx, type, attr);
6889         if (IS_ERR(newobj)) {
6890                 err = PTR_ERR(newobj);
6891                 goto err_free_trans;
6892         }
6893
6894         nft_trans_obj(trans) = obj;
6895         nft_trans_obj_update(trans) = true;
6896         nft_trans_obj_newobj(trans) = newobj;
6897         nft_trans_commit_list_add_tail(ctx->net, trans);
6898
6899         return 0;
6900
6901 err_free_trans:
6902         kfree(trans);
6903 err_trans:
6904         module_put(type->owner);
6905         return err;
6906 }
6907
6908 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
6909                             const struct nlattr * const nla[])
6910 {
6911         struct netlink_ext_ack *extack = info->extack;
6912         u8 genmask = nft_genmask_next(info->net);
6913         u8 family = info->nfmsg->nfgen_family;
6914         const struct nft_object_type *type;
6915         struct net *net = info->net;
6916         struct nft_table *table;
6917         struct nft_object *obj;
6918         struct nft_ctx ctx;
6919         u32 objtype;
6920         int err;
6921
6922         if (!nla[NFTA_OBJ_TYPE] ||
6923             !nla[NFTA_OBJ_NAME] ||
6924             !nla[NFTA_OBJ_DATA])
6925                 return -EINVAL;
6926
6927         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6928                                  NETLINK_CB(skb).portid);
6929         if (IS_ERR(table)) {
6930                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6931                 return PTR_ERR(table);
6932         }
6933
6934         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6935         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6936         if (IS_ERR(obj)) {
6937                 err = PTR_ERR(obj);
6938                 if (err != -ENOENT) {
6939                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6940                         return err;
6941                 }
6942         } else {
6943                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
6944                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6945                         return -EEXIST;
6946                 }
6947                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
6948                         return -EOPNOTSUPP;
6949
6950                 type = __nft_obj_type_get(objtype);
6951                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6952
6953                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6954         }
6955
6956         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6957
6958         type = nft_obj_type_get(net, objtype);
6959         if (IS_ERR(type))
6960                 return PTR_ERR(type);
6961
6962         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6963         if (IS_ERR(obj)) {
6964                 err = PTR_ERR(obj);
6965                 goto err_init;
6966         }
6967         obj->key.table = table;
6968         obj->handle = nf_tables_alloc_handle(table);
6969
6970         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
6971         if (!obj->key.name) {
6972                 err = -ENOMEM;
6973                 goto err_strdup;
6974         }
6975
6976         if (nla[NFTA_OBJ_USERDATA]) {
6977                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6978                 if (obj->udata == NULL)
6979                         goto err_userdata;
6980
6981                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6982         }
6983
6984         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6985         if (err < 0)
6986                 goto err_trans;
6987
6988         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6989                               nft_objname_ht_params);
6990         if (err < 0)
6991                 goto err_obj_ht;
6992
6993         list_add_tail_rcu(&obj->list, &table->objects);
6994         table->use++;
6995         return 0;
6996 err_obj_ht:
6997         /* queued in transaction log */
6998         INIT_LIST_HEAD(&obj->list);
6999         return err;
7000 err_trans:
7001         kfree(obj->udata);
7002 err_userdata:
7003         kfree(obj->key.name);
7004 err_strdup:
7005         if (obj->ops->destroy)
7006                 obj->ops->destroy(&ctx, obj);
7007         kfree(obj);
7008 err_init:
7009         module_put(type->owner);
7010         return err;
7011 }
7012
7013 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7014                                    u32 portid, u32 seq, int event, u32 flags,
7015                                    int family, const struct nft_table *table,
7016                                    struct nft_object *obj, bool reset)
7017 {
7018         struct nlmsghdr *nlh;
7019
7020         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7021         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7022                            NFNETLINK_V0, nft_base_seq(net));
7023         if (!nlh)
7024                 goto nla_put_failure;
7025
7026         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7027             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7028             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7029             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7030             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
7031             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7032                          NFTA_OBJ_PAD))
7033                 goto nla_put_failure;
7034
7035         if (obj->udata &&
7036             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7037                 goto nla_put_failure;
7038
7039         nlmsg_end(skb, nlh);
7040         return 0;
7041
7042 nla_put_failure:
7043         nlmsg_trim(skb, nlh);
7044         return -1;
7045 }
7046
7047 struct nft_obj_filter {
7048         char            *table;
7049         u32             type;
7050 };
7051
7052 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7053 {
7054         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7055         const struct nft_table *table;
7056         unsigned int idx = 0, s_idx = cb->args[0];
7057         struct nft_obj_filter *filter = cb->data;
7058         struct net *net = sock_net(skb->sk);
7059         int family = nfmsg->nfgen_family;
7060         struct nftables_pernet *nft_net;
7061         struct nft_object *obj;
7062         bool reset = false;
7063
7064         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7065                 reset = true;
7066
7067         rcu_read_lock();
7068         nft_net = nft_pernet(net);
7069         cb->seq = READ_ONCE(nft_net->base_seq);
7070
7071         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7072                 if (family != NFPROTO_UNSPEC && family != table->family)
7073                         continue;
7074
7075                 list_for_each_entry_rcu(obj, &table->objects, list) {
7076                         if (!nft_is_active(net, obj))
7077                                 goto cont;
7078                         if (idx < s_idx)
7079                                 goto cont;
7080                         if (idx > s_idx)
7081                                 memset(&cb->args[1], 0,
7082                                        sizeof(cb->args) - sizeof(cb->args[0]));
7083                         if (filter && filter->table &&
7084                             strcmp(filter->table, table->name))
7085                                 goto cont;
7086                         if (filter &&
7087                             filter->type != NFT_OBJECT_UNSPEC &&
7088                             obj->ops->type->type != filter->type)
7089                                 goto cont;
7090                         if (reset) {
7091                                 char *buf = kasprintf(GFP_ATOMIC,
7092                                                       "%s:%u",
7093                                                       table->name,
7094                                                       nft_net->base_seq);
7095
7096                                 audit_log_nfcfg(buf,
7097                                                 family,
7098                                                 obj->handle,
7099                                                 AUDIT_NFT_OP_OBJ_RESET,
7100                                                 GFP_ATOMIC);
7101                                 kfree(buf);
7102                         }
7103
7104                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7105                                                     cb->nlh->nlmsg_seq,
7106                                                     NFT_MSG_NEWOBJ,
7107                                                     NLM_F_MULTI | NLM_F_APPEND,
7108                                                     table->family, table,
7109                                                     obj, reset) < 0)
7110                                 goto done;
7111
7112                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7113 cont:
7114                         idx++;
7115                 }
7116         }
7117 done:
7118         rcu_read_unlock();
7119
7120         cb->args[0] = idx;
7121         return skb->len;
7122 }
7123
7124 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7125 {
7126         const struct nlattr * const *nla = cb->data;
7127         struct nft_obj_filter *filter = NULL;
7128
7129         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7130                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7131                 if (!filter)
7132                         return -ENOMEM;
7133
7134                 if (nla[NFTA_OBJ_TABLE]) {
7135                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7136                         if (!filter->table) {
7137                                 kfree(filter);
7138                                 return -ENOMEM;
7139                         }
7140                 }
7141
7142                 if (nla[NFTA_OBJ_TYPE])
7143                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7144         }
7145
7146         cb->data = filter;
7147         return 0;
7148 }
7149
7150 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7151 {
7152         struct nft_obj_filter *filter = cb->data;
7153
7154         if (filter) {
7155                 kfree(filter->table);
7156                 kfree(filter);
7157         }
7158
7159         return 0;
7160 }
7161
7162 /* called with rcu_read_lock held */
7163 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7164                             const struct nlattr * const nla[])
7165 {
7166         struct netlink_ext_ack *extack = info->extack;
7167         u8 genmask = nft_genmask_cur(info->net);
7168         u8 family = info->nfmsg->nfgen_family;
7169         const struct nft_table *table;
7170         struct net *net = info->net;
7171         struct nft_object *obj;
7172         struct sk_buff *skb2;
7173         bool reset = false;
7174         u32 objtype;
7175         int err;
7176
7177         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7178                 struct netlink_dump_control c = {
7179                         .start = nf_tables_dump_obj_start,
7180                         .dump = nf_tables_dump_obj,
7181                         .done = nf_tables_dump_obj_done,
7182                         .module = THIS_MODULE,
7183                         .data = (void *)nla,
7184                 };
7185
7186                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7187         }
7188
7189         if (!nla[NFTA_OBJ_NAME] ||
7190             !nla[NFTA_OBJ_TYPE])
7191                 return -EINVAL;
7192
7193         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7194         if (IS_ERR(table)) {
7195                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7196                 return PTR_ERR(table);
7197         }
7198
7199         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7200         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7201         if (IS_ERR(obj)) {
7202                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7203                 return PTR_ERR(obj);
7204         }
7205
7206         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7207         if (!skb2)
7208                 return -ENOMEM;
7209
7210         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7211                 reset = true;
7212
7213         if (reset) {
7214                 const struct nftables_pernet *nft_net;
7215                 char *buf;
7216
7217                 nft_net = nft_pernet(net);
7218                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7219
7220                 audit_log_nfcfg(buf,
7221                                 family,
7222                                 obj->handle,
7223                                 AUDIT_NFT_OP_OBJ_RESET,
7224                                 GFP_ATOMIC);
7225                 kfree(buf);
7226         }
7227
7228         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7229                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7230                                       family, table, obj, reset);
7231         if (err < 0)
7232                 goto err_fill_obj_info;
7233
7234         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7235
7236 err_fill_obj_info:
7237         kfree_skb(skb2);
7238         return err;
7239 }
7240
7241 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7242 {
7243         if (obj->ops->destroy)
7244                 obj->ops->destroy(ctx, obj);
7245
7246         module_put(obj->ops->type->owner);
7247         kfree(obj->key.name);
7248         kfree(obj->udata);
7249         kfree(obj);
7250 }
7251
7252 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7253                             const struct nlattr * const nla[])
7254 {
7255         struct netlink_ext_ack *extack = info->extack;
7256         u8 genmask = nft_genmask_next(info->net);
7257         u8 family = info->nfmsg->nfgen_family;
7258         struct net *net = info->net;
7259         const struct nlattr *attr;
7260         struct nft_table *table;
7261         struct nft_object *obj;
7262         struct nft_ctx ctx;
7263         u32 objtype;
7264
7265         if (!nla[NFTA_OBJ_TYPE] ||
7266             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7267                 return -EINVAL;
7268
7269         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7270                                  NETLINK_CB(skb).portid);
7271         if (IS_ERR(table)) {
7272                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7273                 return PTR_ERR(table);
7274         }
7275
7276         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7277         if (nla[NFTA_OBJ_HANDLE]) {
7278                 attr = nla[NFTA_OBJ_HANDLE];
7279                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7280         } else {
7281                 attr = nla[NFTA_OBJ_NAME];
7282                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7283         }
7284
7285         if (IS_ERR(obj)) {
7286                 NL_SET_BAD_ATTR(extack, attr);
7287                 return PTR_ERR(obj);
7288         }
7289         if (obj->use > 0) {
7290                 NL_SET_BAD_ATTR(extack, attr);
7291                 return -EBUSY;
7292         }
7293
7294         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7295
7296         return nft_delobj(&ctx, obj);
7297 }
7298
7299 void nft_obj_notify(struct net *net, const struct nft_table *table,
7300                     struct nft_object *obj, u32 portid, u32 seq, int event,
7301                     u16 flags, int family, int report, gfp_t gfp)
7302 {
7303         struct nftables_pernet *nft_net = nft_pernet(net);
7304         struct sk_buff *skb;
7305         int err;
7306         char *buf = kasprintf(gfp, "%s:%u",
7307                               table->name, nft_net->base_seq);
7308
7309         audit_log_nfcfg(buf,
7310                         family,
7311                         obj->handle,
7312                         event == NFT_MSG_NEWOBJ ?
7313                                  AUDIT_NFT_OP_OBJ_REGISTER :
7314                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7315                         gfp);
7316         kfree(buf);
7317
7318         if (!report &&
7319             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7320                 return;
7321
7322         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7323         if (skb == NULL)
7324                 goto err;
7325
7326         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7327                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7328                                       family, table, obj, false);
7329         if (err < 0) {
7330                 kfree_skb(skb);
7331                 goto err;
7332         }
7333
7334         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7335         return;
7336 err:
7337         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7338 }
7339 EXPORT_SYMBOL_GPL(nft_obj_notify);
7340
7341 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7342                                  struct nft_object *obj, int event)
7343 {
7344         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7345                        ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7346 }
7347
7348 /*
7349  * Flow tables
7350  */
7351 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7352 {
7353         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7354         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7355         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7356 }
7357 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7358
7359 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7360 {
7361         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7362         list_del_rcu(&type->list);
7363         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7364 }
7365 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7366
7367 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7368         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7369                                             .len = NFT_NAME_MAXLEN - 1 },
7370         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7371                                             .len = NFT_NAME_MAXLEN - 1 },
7372         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7373         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7374         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7375 };
7376
7377 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7378                                            const struct nlattr *nla, u8 genmask)
7379 {
7380         struct nft_flowtable *flowtable;
7381
7382         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7383                 if (!nla_strcmp(nla, flowtable->name) &&
7384                     nft_active_genmask(flowtable, genmask))
7385                         return flowtable;
7386         }
7387         return ERR_PTR(-ENOENT);
7388 }
7389 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7390
7391 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7392                                     struct nft_flowtable *flowtable,
7393                                     enum nft_trans_phase phase)
7394 {
7395         switch (phase) {
7396         case NFT_TRANS_PREPARE:
7397         case NFT_TRANS_ABORT:
7398         case NFT_TRANS_RELEASE:
7399                 flowtable->use--;
7400                 fallthrough;
7401         default:
7402                 return;
7403         }
7404 }
7405 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7406
7407 static struct nft_flowtable *
7408 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7409                               const struct nlattr *nla, u8 genmask)
7410 {
7411        struct nft_flowtable *flowtable;
7412
7413        list_for_each_entry(flowtable, &table->flowtables, list) {
7414                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7415                    nft_active_genmask(flowtable, genmask))
7416                        return flowtable;
7417        }
7418        return ERR_PTR(-ENOENT);
7419 }
7420
7421 struct nft_flowtable_hook {
7422         u32                     num;
7423         int                     priority;
7424         struct list_head        list;
7425 };
7426
7427 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7428         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
7429         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
7430         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
7431 };
7432
7433 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7434                                     const struct nlattr *attr,
7435                                     struct nft_flowtable_hook *flowtable_hook,
7436                                     struct nft_flowtable *flowtable, bool add)
7437 {
7438         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7439         struct nft_hook *hook;
7440         int hooknum, priority;
7441         int err;
7442
7443         INIT_LIST_HEAD(&flowtable_hook->list);
7444
7445         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7446                                           nft_flowtable_hook_policy, NULL);
7447         if (err < 0)
7448                 return err;
7449
7450         if (add) {
7451                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7452                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7453                         return -EINVAL;
7454
7455                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7456                 if (hooknum != NF_NETDEV_INGRESS)
7457                         return -EOPNOTSUPP;
7458
7459                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7460
7461                 flowtable_hook->priority        = priority;
7462                 flowtable_hook->num             = hooknum;
7463         } else {
7464                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7465                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7466                         if (hooknum != flowtable->hooknum)
7467                                 return -EOPNOTSUPP;
7468                 }
7469
7470                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7471                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7472                         if (priority != flowtable->data.priority)
7473                                 return -EOPNOTSUPP;
7474                 }
7475
7476                 flowtable_hook->priority        = flowtable->data.priority;
7477                 flowtable_hook->num             = flowtable->hooknum;
7478         }
7479
7480         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7481                 err = nf_tables_parse_netdev_hooks(ctx->net,
7482                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
7483                                                    &flowtable_hook->list);
7484                 if (err < 0)
7485                         return err;
7486         }
7487
7488         list_for_each_entry(hook, &flowtable_hook->list, list) {
7489                 hook->ops.pf            = NFPROTO_NETDEV;
7490                 hook->ops.hooknum       = flowtable_hook->num;
7491                 hook->ops.priority      = flowtable_hook->priority;
7492                 hook->ops.priv          = &flowtable->data;
7493                 hook->ops.hook          = flowtable->data.type->hook;
7494         }
7495
7496         return err;
7497 }
7498
7499 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7500 {
7501         const struct nf_flowtable_type *type;
7502
7503         list_for_each_entry(type, &nf_tables_flowtables, list) {
7504                 if (family == type->family)
7505                         return type;
7506         }
7507         return NULL;
7508 }
7509
7510 static const struct nf_flowtable_type *
7511 nft_flowtable_type_get(struct net *net, u8 family)
7512 {
7513         const struct nf_flowtable_type *type;
7514
7515         type = __nft_flowtable_type_get(family);
7516         if (type != NULL && try_module_get(type->owner))
7517                 return type;
7518
7519         lockdep_nfnl_nft_mutex_not_held();
7520 #ifdef CONFIG_MODULES
7521         if (type == NULL) {
7522                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7523                         return ERR_PTR(-EAGAIN);
7524         }
7525 #endif
7526         return ERR_PTR(-ENOENT);
7527 }
7528
7529 /* Only called from error and netdev event paths. */
7530 static void nft_unregister_flowtable_hook(struct net *net,
7531                                           struct nft_flowtable *flowtable,
7532                                           struct nft_hook *hook)
7533 {
7534         nf_unregister_net_hook(net, &hook->ops);
7535         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7536                                     FLOW_BLOCK_UNBIND);
7537 }
7538
7539 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7540                                                  struct list_head *hook_list,
7541                                                  bool release_netdev)
7542 {
7543         struct nft_hook *hook, *next;
7544
7545         list_for_each_entry_safe(hook, next, hook_list, list) {
7546                 nf_unregister_net_hook(net, &hook->ops);
7547                 if (release_netdev) {
7548                         list_del(&hook->list);
7549                         kfree_rcu(hook, rcu);
7550                 }
7551         }
7552 }
7553
7554 static void nft_unregister_flowtable_net_hooks(struct net *net,
7555                                                struct list_head *hook_list)
7556 {
7557         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7558 }
7559
7560 static int nft_register_flowtable_net_hooks(struct net *net,
7561                                             struct nft_table *table,
7562                                             struct list_head *hook_list,
7563                                             struct nft_flowtable *flowtable)
7564 {
7565         struct nft_hook *hook, *hook2, *next;
7566         struct nft_flowtable *ft;
7567         int err, i = 0;
7568
7569         list_for_each_entry(hook, hook_list, list) {
7570                 list_for_each_entry(ft, &table->flowtables, list) {
7571                         if (!nft_is_active_next(net, ft))
7572                                 continue;
7573
7574                         list_for_each_entry(hook2, &ft->hook_list, list) {
7575                                 if (hook->ops.dev == hook2->ops.dev &&
7576                                     hook->ops.pf == hook2->ops.pf) {
7577                                         err = -EEXIST;
7578                                         goto err_unregister_net_hooks;
7579                                 }
7580                         }
7581                 }
7582
7583                 err = flowtable->data.type->setup(&flowtable->data,
7584                                                   hook->ops.dev,
7585                                                   FLOW_BLOCK_BIND);
7586                 if (err < 0)
7587                         goto err_unregister_net_hooks;
7588
7589                 err = nf_register_net_hook(net, &hook->ops);
7590                 if (err < 0) {
7591                         flowtable->data.type->setup(&flowtable->data,
7592                                                     hook->ops.dev,
7593                                                     FLOW_BLOCK_UNBIND);
7594                         goto err_unregister_net_hooks;
7595                 }
7596
7597                 i++;
7598         }
7599
7600         return 0;
7601
7602 err_unregister_net_hooks:
7603         list_for_each_entry_safe(hook, next, hook_list, list) {
7604                 if (i-- <= 0)
7605                         break;
7606
7607                 nft_unregister_flowtable_hook(net, flowtable, hook);
7608                 list_del_rcu(&hook->list);
7609                 kfree_rcu(hook, rcu);
7610         }
7611
7612         return err;
7613 }
7614
7615 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7616 {
7617         struct nft_hook *hook, *next;
7618
7619         list_for_each_entry_safe(hook, next, hook_list, list) {
7620                 list_del_rcu(&hook->list);
7621                 kfree_rcu(hook, rcu);
7622         }
7623 }
7624
7625 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7626                                 struct nft_flowtable *flowtable)
7627 {
7628         const struct nlattr * const *nla = ctx->nla;
7629         struct nft_flowtable_hook flowtable_hook;
7630         struct nft_hook *hook, *next;
7631         struct nft_trans *trans;
7632         bool unregister = false;
7633         u32 flags;
7634         int err;
7635
7636         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7637                                        &flowtable_hook, flowtable, false);
7638         if (err < 0)
7639                 return err;
7640
7641         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7642                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7643                         list_del(&hook->list);
7644                         kfree(hook);
7645                 }
7646         }
7647
7648         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7649                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7650                 if (flags & ~NFT_FLOWTABLE_MASK) {
7651                         err = -EOPNOTSUPP;
7652                         goto err_flowtable_update_hook;
7653                 }
7654                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7655                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7656                         err = -EOPNOTSUPP;
7657                         goto err_flowtable_update_hook;
7658                 }
7659         } else {
7660                 flags = flowtable->data.flags;
7661         }
7662
7663         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7664                                                &flowtable_hook.list, flowtable);
7665         if (err < 0)
7666                 goto err_flowtable_update_hook;
7667
7668         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7669                                 sizeof(struct nft_trans_flowtable));
7670         if (!trans) {
7671                 unregister = true;
7672                 err = -ENOMEM;
7673                 goto err_flowtable_update_hook;
7674         }
7675
7676         nft_trans_flowtable_flags(trans) = flags;
7677         nft_trans_flowtable(trans) = flowtable;
7678         nft_trans_flowtable_update(trans) = true;
7679         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7680         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7681
7682         nft_trans_commit_list_add_tail(ctx->net, trans);
7683
7684         return 0;
7685
7686 err_flowtable_update_hook:
7687         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7688                 if (unregister)
7689                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7690                 list_del_rcu(&hook->list);
7691                 kfree_rcu(hook, rcu);
7692         }
7693
7694         return err;
7695
7696 }
7697
7698 static int nf_tables_newflowtable(struct sk_buff *skb,
7699                                   const struct nfnl_info *info,
7700                                   const struct nlattr * const nla[])
7701 {
7702         struct netlink_ext_ack *extack = info->extack;
7703         struct nft_flowtable_hook flowtable_hook;
7704         u8 genmask = nft_genmask_next(info->net);
7705         u8 family = info->nfmsg->nfgen_family;
7706         const struct nf_flowtable_type *type;
7707         struct nft_flowtable *flowtable;
7708         struct nft_hook *hook, *next;
7709         struct net *net = info->net;
7710         struct nft_table *table;
7711         struct nft_ctx ctx;
7712         int err;
7713
7714         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7715             !nla[NFTA_FLOWTABLE_NAME] ||
7716             !nla[NFTA_FLOWTABLE_HOOK])
7717                 return -EINVAL;
7718
7719         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7720                                  genmask, NETLINK_CB(skb).portid);
7721         if (IS_ERR(table)) {
7722                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7723                 return PTR_ERR(table);
7724         }
7725
7726         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7727                                          genmask);
7728         if (IS_ERR(flowtable)) {
7729                 err = PTR_ERR(flowtable);
7730                 if (err != -ENOENT) {
7731                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7732                         return err;
7733                 }
7734         } else {
7735                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7736                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7737                         return -EEXIST;
7738                 }
7739
7740                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7741
7742                 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7743         }
7744
7745         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7746
7747         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
7748         if (!flowtable)
7749                 return -ENOMEM;
7750
7751         flowtable->table = table;
7752         flowtable->handle = nf_tables_alloc_handle(table);
7753         INIT_LIST_HEAD(&flowtable->hook_list);
7754
7755         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
7756         if (!flowtable->name) {
7757                 err = -ENOMEM;
7758                 goto err1;
7759         }
7760
7761         type = nft_flowtable_type_get(net, family);
7762         if (IS_ERR(type)) {
7763                 err = PTR_ERR(type);
7764                 goto err2;
7765         }
7766
7767         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7768                 flowtable->data.flags =
7769                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7770                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7771                         err = -EOPNOTSUPP;
7772                         goto err3;
7773                 }
7774         }
7775
7776         write_pnet(&flowtable->data.net, net);
7777         flowtable->data.type = type;
7778         err = type->init(&flowtable->data);
7779         if (err < 0)
7780                 goto err3;
7781
7782         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7783                                        &flowtable_hook, flowtable, true);
7784         if (err < 0)
7785                 goto err4;
7786
7787         list_splice(&flowtable_hook.list, &flowtable->hook_list);
7788         flowtable->data.priority = flowtable_hook.priority;
7789         flowtable->hooknum = flowtable_hook.num;
7790
7791         err = nft_register_flowtable_net_hooks(ctx.net, table,
7792                                                &flowtable->hook_list,
7793                                                flowtable);
7794         if (err < 0) {
7795                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7796                 goto err4;
7797         }
7798
7799         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7800         if (err < 0)
7801                 goto err5;
7802
7803         list_add_tail_rcu(&flowtable->list, &table->flowtables);
7804         table->use++;
7805
7806         return 0;
7807 err5:
7808         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7809                 nft_unregister_flowtable_hook(net, flowtable, hook);
7810                 list_del_rcu(&hook->list);
7811                 kfree_rcu(hook, rcu);
7812         }
7813 err4:
7814         flowtable->data.type->free(&flowtable->data);
7815 err3:
7816         module_put(type->owner);
7817 err2:
7818         kfree(flowtable->name);
7819 err1:
7820         kfree(flowtable);
7821         return err;
7822 }
7823
7824 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7825 {
7826         struct nft_hook *this, *next;
7827
7828         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7829                 list_del(&this->list);
7830                 kfree(this);
7831         }
7832 }
7833
7834 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7835                                  struct nft_flowtable *flowtable)
7836 {
7837         const struct nlattr * const *nla = ctx->nla;
7838         struct nft_flowtable_hook flowtable_hook;
7839         LIST_HEAD(flowtable_del_list);
7840         struct nft_hook *this, *hook;
7841         struct nft_trans *trans;
7842         int err;
7843
7844         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7845                                        &flowtable_hook, flowtable, false);
7846         if (err < 0)
7847                 return err;
7848
7849         list_for_each_entry(this, &flowtable_hook.list, list) {
7850                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7851                 if (!hook) {
7852                         err = -ENOENT;
7853                         goto err_flowtable_del_hook;
7854                 }
7855                 list_move(&hook->list, &flowtable_del_list);
7856         }
7857
7858         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7859                                 sizeof(struct nft_trans_flowtable));
7860         if (!trans) {
7861                 err = -ENOMEM;
7862                 goto err_flowtable_del_hook;
7863         }
7864
7865         nft_trans_flowtable(trans) = flowtable;
7866         nft_trans_flowtable_update(trans) = true;
7867         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7868         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
7869         nft_flowtable_hook_release(&flowtable_hook);
7870
7871         nft_trans_commit_list_add_tail(ctx->net, trans);
7872
7873         return 0;
7874
7875 err_flowtable_del_hook:
7876         list_splice(&flowtable_del_list, &flowtable->hook_list);
7877         nft_flowtable_hook_release(&flowtable_hook);
7878
7879         return err;
7880 }
7881
7882 static int nf_tables_delflowtable(struct sk_buff *skb,
7883                                   const struct nfnl_info *info,
7884                                   const struct nlattr * const nla[])
7885 {
7886         struct netlink_ext_ack *extack = info->extack;
7887         u8 genmask = nft_genmask_next(info->net);
7888         u8 family = info->nfmsg->nfgen_family;
7889         struct nft_flowtable *flowtable;
7890         struct net *net = info->net;
7891         const struct nlattr *attr;
7892         struct nft_table *table;
7893         struct nft_ctx ctx;
7894
7895         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7896             (!nla[NFTA_FLOWTABLE_NAME] &&
7897              !nla[NFTA_FLOWTABLE_HANDLE]))
7898                 return -EINVAL;
7899
7900         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7901                                  genmask, NETLINK_CB(skb).portid);
7902         if (IS_ERR(table)) {
7903                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7904                 return PTR_ERR(table);
7905         }
7906
7907         if (nla[NFTA_FLOWTABLE_HANDLE]) {
7908                 attr = nla[NFTA_FLOWTABLE_HANDLE];
7909                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7910         } else {
7911                 attr = nla[NFTA_FLOWTABLE_NAME];
7912                 flowtable = nft_flowtable_lookup(table, attr, genmask);
7913         }
7914
7915         if (IS_ERR(flowtable)) {
7916                 NL_SET_BAD_ATTR(extack, attr);
7917                 return PTR_ERR(flowtable);
7918         }
7919
7920         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7921
7922         if (nla[NFTA_FLOWTABLE_HOOK])
7923                 return nft_delflowtable_hook(&ctx, flowtable);
7924
7925         if (flowtable->use > 0) {
7926                 NL_SET_BAD_ATTR(extack, attr);
7927                 return -EBUSY;
7928         }
7929
7930         return nft_delflowtable(&ctx, flowtable);
7931 }
7932
7933 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7934                                          u32 portid, u32 seq, int event,
7935                                          u32 flags, int family,
7936                                          struct nft_flowtable *flowtable,
7937                                          struct list_head *hook_list)
7938 {
7939         struct nlattr *nest, *nest_devs;
7940         struct nft_hook *hook;
7941         struct nlmsghdr *nlh;
7942
7943         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7944         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7945                            NFNETLINK_V0, nft_base_seq(net));
7946         if (!nlh)
7947                 goto nla_put_failure;
7948
7949         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7950             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7951             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7952             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7953                          NFTA_FLOWTABLE_PAD) ||
7954             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7955                 goto nla_put_failure;
7956
7957         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7958         if (!nest)
7959                 goto nla_put_failure;
7960         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7961             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7962                 goto nla_put_failure;
7963
7964         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7965         if (!nest_devs)
7966                 goto nla_put_failure;
7967
7968         list_for_each_entry_rcu(hook, hook_list, list) {
7969                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7970                         goto nla_put_failure;
7971         }
7972         nla_nest_end(skb, nest_devs);
7973         nla_nest_end(skb, nest);
7974
7975         nlmsg_end(skb, nlh);
7976         return 0;
7977
7978 nla_put_failure:
7979         nlmsg_trim(skb, nlh);
7980         return -1;
7981 }
7982
7983 struct nft_flowtable_filter {
7984         char            *table;
7985 };
7986
7987 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7988                                     struct netlink_callback *cb)
7989 {
7990         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7991         struct nft_flowtable_filter *filter = cb->data;
7992         unsigned int idx = 0, s_idx = cb->args[0];
7993         struct net *net = sock_net(skb->sk);
7994         int family = nfmsg->nfgen_family;
7995         struct nft_flowtable *flowtable;
7996         struct nftables_pernet *nft_net;
7997         const struct nft_table *table;
7998
7999         rcu_read_lock();
8000         nft_net = nft_pernet(net);
8001         cb->seq = READ_ONCE(nft_net->base_seq);
8002
8003         list_for_each_entry_rcu(table, &nft_net->tables, list) {
8004                 if (family != NFPROTO_UNSPEC && family != table->family)
8005                         continue;
8006
8007                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8008                         if (!nft_is_active(net, flowtable))
8009                                 goto cont;
8010                         if (idx < s_idx)
8011                                 goto cont;
8012                         if (idx > s_idx)
8013                                 memset(&cb->args[1], 0,
8014                                        sizeof(cb->args) - sizeof(cb->args[0]));
8015                         if (filter && filter->table &&
8016                             strcmp(filter->table, table->name))
8017                                 goto cont;
8018
8019                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8020                                                           cb->nlh->nlmsg_seq,
8021                                                           NFT_MSG_NEWFLOWTABLE,
8022                                                           NLM_F_MULTI | NLM_F_APPEND,
8023                                                           table->family,
8024                                                           flowtable,
8025                                                           &flowtable->hook_list) < 0)
8026                                 goto done;
8027
8028                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8029 cont:
8030                         idx++;
8031                 }
8032         }
8033 done:
8034         rcu_read_unlock();
8035
8036         cb->args[0] = idx;
8037         return skb->len;
8038 }
8039
8040 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8041 {
8042         const struct nlattr * const *nla = cb->data;
8043         struct nft_flowtable_filter *filter = NULL;
8044
8045         if (nla[NFTA_FLOWTABLE_TABLE]) {
8046                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8047                 if (!filter)
8048                         return -ENOMEM;
8049
8050                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8051                                            GFP_ATOMIC);
8052                 if (!filter->table) {
8053                         kfree(filter);
8054                         return -ENOMEM;
8055                 }
8056         }
8057
8058         cb->data = filter;
8059         return 0;
8060 }
8061
8062 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8063 {
8064         struct nft_flowtable_filter *filter = cb->data;
8065
8066         if (!filter)
8067                 return 0;
8068
8069         kfree(filter->table);
8070         kfree(filter);
8071
8072         return 0;
8073 }
8074
8075 /* called with rcu_read_lock held */
8076 static int nf_tables_getflowtable(struct sk_buff *skb,
8077                                   const struct nfnl_info *info,
8078                                   const struct nlattr * const nla[])
8079 {
8080         u8 genmask = nft_genmask_cur(info->net);
8081         u8 family = info->nfmsg->nfgen_family;
8082         struct nft_flowtable *flowtable;
8083         const struct nft_table *table;
8084         struct net *net = info->net;
8085         struct sk_buff *skb2;
8086         int err;
8087
8088         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8089                 struct netlink_dump_control c = {
8090                         .start = nf_tables_dump_flowtable_start,
8091                         .dump = nf_tables_dump_flowtable,
8092                         .done = nf_tables_dump_flowtable_done,
8093                         .module = THIS_MODULE,
8094                         .data = (void *)nla,
8095                 };
8096
8097                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8098         }
8099
8100         if (!nla[NFTA_FLOWTABLE_NAME])
8101                 return -EINVAL;
8102
8103         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8104                                  genmask, 0);
8105         if (IS_ERR(table))
8106                 return PTR_ERR(table);
8107
8108         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8109                                          genmask);
8110         if (IS_ERR(flowtable))
8111                 return PTR_ERR(flowtable);
8112
8113         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8114         if (!skb2)
8115                 return -ENOMEM;
8116
8117         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8118                                             info->nlh->nlmsg_seq,
8119                                             NFT_MSG_NEWFLOWTABLE, 0, family,
8120                                             flowtable, &flowtable->hook_list);
8121         if (err < 0)
8122                 goto err_fill_flowtable_info;
8123
8124         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8125
8126 err_fill_flowtable_info:
8127         kfree_skb(skb2);
8128         return err;
8129 }
8130
8131 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8132                                        struct nft_flowtable *flowtable,
8133                                        struct list_head *hook_list,
8134                                        int event)
8135 {
8136         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8137         struct sk_buff *skb;
8138         u16 flags = 0;
8139         int err;
8140
8141         if (!ctx->report &&
8142             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8143                 return;
8144
8145         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8146         if (skb == NULL)
8147                 goto err;
8148
8149         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8150                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8151
8152         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8153                                             ctx->seq, event, flags,
8154                                             ctx->family, flowtable, hook_list);
8155         if (err < 0) {
8156                 kfree_skb(skb);
8157                 goto err;
8158         }
8159
8160         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8161         return;
8162 err:
8163         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8164 }
8165
8166 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8167 {
8168         struct nft_hook *hook, *next;
8169
8170         flowtable->data.type->free(&flowtable->data);
8171         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8172                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8173                                             FLOW_BLOCK_UNBIND);
8174                 list_del_rcu(&hook->list);
8175                 kfree(hook);
8176         }
8177         kfree(flowtable->name);
8178         module_put(flowtable->data.type->owner);
8179         kfree(flowtable);
8180 }
8181
8182 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8183                                    u32 portid, u32 seq)
8184 {
8185         struct nftables_pernet *nft_net = nft_pernet(net);
8186         struct nlmsghdr *nlh;
8187         char buf[TASK_COMM_LEN];
8188         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8189
8190         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8191                            NFNETLINK_V0, nft_base_seq(net));
8192         if (!nlh)
8193                 goto nla_put_failure;
8194
8195         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8196             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8197             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8198                 goto nla_put_failure;
8199
8200         nlmsg_end(skb, nlh);
8201         return 0;
8202
8203 nla_put_failure:
8204         nlmsg_trim(skb, nlh);
8205         return -EMSGSIZE;
8206 }
8207
8208 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8209                                 struct nft_flowtable *flowtable)
8210 {
8211         struct nft_hook *hook;
8212
8213         list_for_each_entry(hook, &flowtable->hook_list, list) {
8214                 if (hook->ops.dev != dev)
8215                         continue;
8216
8217                 /* flow_offload_netdev_event() cleans up entries for us. */
8218                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8219                 list_del_rcu(&hook->list);
8220                 kfree_rcu(hook, rcu);
8221                 break;
8222         }
8223 }
8224
8225 static int nf_tables_flowtable_event(struct notifier_block *this,
8226                                      unsigned long event, void *ptr)
8227 {
8228         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8229         struct nft_flowtable *flowtable;
8230         struct nftables_pernet *nft_net;
8231         struct nft_table *table;
8232         struct net *net;
8233
8234         if (event != NETDEV_UNREGISTER)
8235                 return 0;
8236
8237         net = dev_net(dev);
8238         nft_net = nft_pernet(net);
8239         mutex_lock(&nft_net->commit_mutex);
8240         list_for_each_entry(table, &nft_net->tables, list) {
8241                 list_for_each_entry(flowtable, &table->flowtables, list) {
8242                         nft_flowtable_event(event, dev, flowtable);
8243                 }
8244         }
8245         mutex_unlock(&nft_net->commit_mutex);
8246
8247         return NOTIFY_DONE;
8248 }
8249
8250 static struct notifier_block nf_tables_flowtable_notifier = {
8251         .notifier_call  = nf_tables_flowtable_event,
8252 };
8253
8254 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8255                                  int event)
8256 {
8257         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8258         struct sk_buff *skb2;
8259         int err;
8260
8261         if (!nlmsg_report(nlh) &&
8262             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8263                 return;
8264
8265         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8266         if (skb2 == NULL)
8267                 goto err;
8268
8269         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8270                                       nlh->nlmsg_seq);
8271         if (err < 0) {
8272                 kfree_skb(skb2);
8273                 goto err;
8274         }
8275
8276         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8277                        nlmsg_report(nlh), GFP_KERNEL);
8278         return;
8279 err:
8280         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8281                           -ENOBUFS);
8282 }
8283
8284 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8285                             const struct nlattr * const nla[])
8286 {
8287         struct sk_buff *skb2;
8288         int err;
8289
8290         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8291         if (skb2 == NULL)
8292                 return -ENOMEM;
8293
8294         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8295                                       info->nlh->nlmsg_seq);
8296         if (err < 0)
8297                 goto err_fill_gen_info;
8298
8299         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8300
8301 err_fill_gen_info:
8302         kfree_skb(skb2);
8303         return err;
8304 }
8305
8306 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8307         [NFT_MSG_NEWTABLE] = {
8308                 .call           = nf_tables_newtable,
8309                 .type           = NFNL_CB_BATCH,
8310                 .attr_count     = NFTA_TABLE_MAX,
8311                 .policy         = nft_table_policy,
8312         },
8313         [NFT_MSG_GETTABLE] = {
8314                 .call           = nf_tables_gettable,
8315                 .type           = NFNL_CB_RCU,
8316                 .attr_count     = NFTA_TABLE_MAX,
8317                 .policy         = nft_table_policy,
8318         },
8319         [NFT_MSG_DELTABLE] = {
8320                 .call           = nf_tables_deltable,
8321                 .type           = NFNL_CB_BATCH,
8322                 .attr_count     = NFTA_TABLE_MAX,
8323                 .policy         = nft_table_policy,
8324         },
8325         [NFT_MSG_NEWCHAIN] = {
8326                 .call           = nf_tables_newchain,
8327                 .type           = NFNL_CB_BATCH,
8328                 .attr_count     = NFTA_CHAIN_MAX,
8329                 .policy         = nft_chain_policy,
8330         },
8331         [NFT_MSG_GETCHAIN] = {
8332                 .call           = nf_tables_getchain,
8333                 .type           = NFNL_CB_RCU,
8334                 .attr_count     = NFTA_CHAIN_MAX,
8335                 .policy         = nft_chain_policy,
8336         },
8337         [NFT_MSG_DELCHAIN] = {
8338                 .call           = nf_tables_delchain,
8339                 .type           = NFNL_CB_BATCH,
8340                 .attr_count     = NFTA_CHAIN_MAX,
8341                 .policy         = nft_chain_policy,
8342         },
8343         [NFT_MSG_NEWRULE] = {
8344                 .call           = nf_tables_newrule,
8345                 .type           = NFNL_CB_BATCH,
8346                 .attr_count     = NFTA_RULE_MAX,
8347                 .policy         = nft_rule_policy,
8348         },
8349         [NFT_MSG_GETRULE] = {
8350                 .call           = nf_tables_getrule,
8351                 .type           = NFNL_CB_RCU,
8352                 .attr_count     = NFTA_RULE_MAX,
8353                 .policy         = nft_rule_policy,
8354         },
8355         [NFT_MSG_GETRULE_RESET] = {
8356                 .call           = nf_tables_getrule,
8357                 .type           = NFNL_CB_RCU,
8358                 .attr_count     = NFTA_RULE_MAX,
8359                 .policy         = nft_rule_policy,
8360         },
8361         [NFT_MSG_DELRULE] = {
8362                 .call           = nf_tables_delrule,
8363                 .type           = NFNL_CB_BATCH,
8364                 .attr_count     = NFTA_RULE_MAX,
8365                 .policy         = nft_rule_policy,
8366         },
8367         [NFT_MSG_NEWSET] = {
8368                 .call           = nf_tables_newset,
8369                 .type           = NFNL_CB_BATCH,
8370                 .attr_count     = NFTA_SET_MAX,
8371                 .policy         = nft_set_policy,
8372         },
8373         [NFT_MSG_GETSET] = {
8374                 .call           = nf_tables_getset,
8375                 .type           = NFNL_CB_RCU,
8376                 .attr_count     = NFTA_SET_MAX,
8377                 .policy         = nft_set_policy,
8378         },
8379         [NFT_MSG_DELSET] = {
8380                 .call           = nf_tables_delset,
8381                 .type           = NFNL_CB_BATCH,
8382                 .attr_count     = NFTA_SET_MAX,
8383                 .policy         = nft_set_policy,
8384         },
8385         [NFT_MSG_NEWSETELEM] = {
8386                 .call           = nf_tables_newsetelem,
8387                 .type           = NFNL_CB_BATCH,
8388                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8389                 .policy         = nft_set_elem_list_policy,
8390         },
8391         [NFT_MSG_GETSETELEM] = {
8392                 .call           = nf_tables_getsetelem,
8393                 .type           = NFNL_CB_RCU,
8394                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8395                 .policy         = nft_set_elem_list_policy,
8396         },
8397         [NFT_MSG_DELSETELEM] = {
8398                 .call           = nf_tables_delsetelem,
8399                 .type           = NFNL_CB_BATCH,
8400                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8401                 .policy         = nft_set_elem_list_policy,
8402         },
8403         [NFT_MSG_GETGEN] = {
8404                 .call           = nf_tables_getgen,
8405                 .type           = NFNL_CB_RCU,
8406         },
8407         [NFT_MSG_NEWOBJ] = {
8408                 .call           = nf_tables_newobj,
8409                 .type           = NFNL_CB_BATCH,
8410                 .attr_count     = NFTA_OBJ_MAX,
8411                 .policy         = nft_obj_policy,
8412         },
8413         [NFT_MSG_GETOBJ] = {
8414                 .call           = nf_tables_getobj,
8415                 .type           = NFNL_CB_RCU,
8416                 .attr_count     = NFTA_OBJ_MAX,
8417                 .policy         = nft_obj_policy,
8418         },
8419         [NFT_MSG_DELOBJ] = {
8420                 .call           = nf_tables_delobj,
8421                 .type           = NFNL_CB_BATCH,
8422                 .attr_count     = NFTA_OBJ_MAX,
8423                 .policy         = nft_obj_policy,
8424         },
8425         [NFT_MSG_GETOBJ_RESET] = {
8426                 .call           = nf_tables_getobj,
8427                 .type           = NFNL_CB_RCU,
8428                 .attr_count     = NFTA_OBJ_MAX,
8429                 .policy         = nft_obj_policy,
8430         },
8431         [NFT_MSG_NEWFLOWTABLE] = {
8432                 .call           = nf_tables_newflowtable,
8433                 .type           = NFNL_CB_BATCH,
8434                 .attr_count     = NFTA_FLOWTABLE_MAX,
8435                 .policy         = nft_flowtable_policy,
8436         },
8437         [NFT_MSG_GETFLOWTABLE] = {
8438                 .call           = nf_tables_getflowtable,
8439                 .type           = NFNL_CB_RCU,
8440                 .attr_count     = NFTA_FLOWTABLE_MAX,
8441                 .policy         = nft_flowtable_policy,
8442         },
8443         [NFT_MSG_DELFLOWTABLE] = {
8444                 .call           = nf_tables_delflowtable,
8445                 .type           = NFNL_CB_BATCH,
8446                 .attr_count     = NFTA_FLOWTABLE_MAX,
8447                 .policy         = nft_flowtable_policy,
8448         },
8449 };
8450
8451 static int nf_tables_validate(struct net *net)
8452 {
8453         struct nftables_pernet *nft_net = nft_pernet(net);
8454         struct nft_table *table;
8455
8456         switch (nft_net->validate_state) {
8457         case NFT_VALIDATE_SKIP:
8458                 break;
8459         case NFT_VALIDATE_NEED:
8460                 nft_validate_state_update(net, NFT_VALIDATE_DO);
8461                 fallthrough;
8462         case NFT_VALIDATE_DO:
8463                 list_for_each_entry(table, &nft_net->tables, list) {
8464                         if (nft_table_validate(net, table) < 0)
8465                                 return -EAGAIN;
8466                 }
8467                 break;
8468         }
8469
8470         return 0;
8471 }
8472
8473 /* a drop policy has to be deferred until all rules have been activated,
8474  * otherwise a large ruleset that contains a drop-policy base chain will
8475  * cause all packets to get dropped until the full transaction has been
8476  * processed.
8477  *
8478  * We defer the drop policy until the transaction has been finalized.
8479  */
8480 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8481 {
8482         struct nft_base_chain *basechain;
8483
8484         if (nft_trans_chain_policy(trans) != NF_DROP)
8485                 return;
8486
8487         if (!nft_is_base_chain(trans->ctx.chain))
8488                 return;
8489
8490         basechain = nft_base_chain(trans->ctx.chain);
8491         basechain->policy = NF_DROP;
8492 }
8493
8494 static void nft_chain_commit_update(struct nft_trans *trans)
8495 {
8496         struct nft_base_chain *basechain;
8497
8498         if (nft_trans_chain_name(trans)) {
8499                 rhltable_remove(&trans->ctx.table->chains_ht,
8500                                 &trans->ctx.chain->rhlhead,
8501                                 nft_chain_ht_params);
8502                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8503                 rhltable_insert_key(&trans->ctx.table->chains_ht,
8504                                     trans->ctx.chain->name,
8505                                     &trans->ctx.chain->rhlhead,
8506                                     nft_chain_ht_params);
8507         }
8508
8509         if (!nft_is_base_chain(trans->ctx.chain))
8510                 return;
8511
8512         nft_chain_stats_replace(trans);
8513
8514         basechain = nft_base_chain(trans->ctx.chain);
8515
8516         switch (nft_trans_chain_policy(trans)) {
8517         case NF_DROP:
8518         case NF_ACCEPT:
8519                 basechain->policy = nft_trans_chain_policy(trans);
8520                 break;
8521         }
8522 }
8523
8524 static void nft_obj_commit_update(struct nft_trans *trans)
8525 {
8526         struct nft_object *newobj;
8527         struct nft_object *obj;
8528
8529         obj = nft_trans_obj(trans);
8530         newobj = nft_trans_obj_newobj(trans);
8531
8532         if (obj->ops->update)
8533                 obj->ops->update(obj, newobj);
8534
8535         nft_obj_destroy(&trans->ctx, newobj);
8536 }
8537
8538 static void nft_commit_release(struct nft_trans *trans)
8539 {
8540         switch (trans->msg_type) {
8541         case NFT_MSG_DELTABLE:
8542                 nf_tables_table_destroy(&trans->ctx);
8543                 break;
8544         case NFT_MSG_NEWCHAIN:
8545                 free_percpu(nft_trans_chain_stats(trans));
8546                 kfree(nft_trans_chain_name(trans));
8547                 break;
8548         case NFT_MSG_DELCHAIN:
8549                 nf_tables_chain_destroy(&trans->ctx);
8550                 break;
8551         case NFT_MSG_DELRULE:
8552                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8553                 break;
8554         case NFT_MSG_DELSET:
8555                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8556                 break;
8557         case NFT_MSG_DELSETELEM:
8558                 nf_tables_set_elem_destroy(&trans->ctx,
8559                                            nft_trans_elem_set(trans),
8560                                            nft_trans_elem(trans).priv);
8561                 break;
8562         case NFT_MSG_DELOBJ:
8563                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8564                 break;
8565         case NFT_MSG_DELFLOWTABLE:
8566                 if (nft_trans_flowtable_update(trans))
8567                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8568                 else
8569                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8570                 break;
8571         }
8572
8573         if (trans->put_net)
8574                 put_net(trans->ctx.net);
8575
8576         kfree(trans);
8577 }
8578
8579 static void nf_tables_trans_destroy_work(struct work_struct *w)
8580 {
8581         struct nft_trans *trans, *next;
8582         LIST_HEAD(head);
8583
8584         spin_lock(&nf_tables_destroy_list_lock);
8585         list_splice_init(&nf_tables_destroy_list, &head);
8586         spin_unlock(&nf_tables_destroy_list_lock);
8587
8588         if (list_empty(&head))
8589                 return;
8590
8591         synchronize_rcu();
8592
8593         list_for_each_entry_safe(trans, next, &head, list) {
8594                 list_del(&trans->list);
8595                 nft_commit_release(trans);
8596         }
8597 }
8598
8599 void nf_tables_trans_destroy_flush_work(void)
8600 {
8601         flush_work(&trans_destroy_work);
8602 }
8603 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8604
8605 static bool nft_expr_reduce(struct nft_regs_track *track,
8606                             const struct nft_expr *expr)
8607 {
8608         return false;
8609 }
8610
8611 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8612 {
8613         const struct nft_expr *expr, *last;
8614         struct nft_regs_track track = {};
8615         unsigned int size, data_size;
8616         void *data, *data_boundary;
8617         struct nft_rule_dp *prule;
8618         struct nft_rule *rule;
8619
8620         /* already handled or inactive chain? */
8621         if (chain->blob_next || !nft_is_active_next(net, chain))
8622                 return 0;
8623
8624         data_size = 0;
8625         list_for_each_entry(rule, &chain->rules, list) {
8626                 if (nft_is_active_next(net, rule)) {
8627                         data_size += sizeof(*prule) + rule->dlen;
8628                         if (data_size > INT_MAX)
8629                                 return -ENOMEM;
8630                 }
8631         }
8632         data_size += offsetof(struct nft_rule_dp, data);        /* last rule */
8633
8634         chain->blob_next = nf_tables_chain_alloc_rules(data_size);
8635         if (!chain->blob_next)
8636                 return -ENOMEM;
8637
8638         data = (void *)chain->blob_next->data;
8639         data_boundary = data + data_size;
8640         size = 0;
8641
8642         list_for_each_entry(rule, &chain->rules, list) {
8643                 if (!nft_is_active_next(net, rule))
8644                         continue;
8645
8646                 prule = (struct nft_rule_dp *)data;
8647                 data += offsetof(struct nft_rule_dp, data);
8648                 if (WARN_ON_ONCE(data > data_boundary))
8649                         return -ENOMEM;
8650
8651                 size = 0;
8652                 track.last = nft_expr_last(rule);
8653                 nft_rule_for_each_expr(expr, last, rule) {
8654                         track.cur = expr;
8655
8656                         if (nft_expr_reduce(&track, expr)) {
8657                                 expr = track.cur;
8658                                 continue;
8659                         }
8660
8661                         if (WARN_ON_ONCE(data + expr->ops->size > data_boundary))
8662                                 return -ENOMEM;
8663
8664                         memcpy(data + size, expr, expr->ops->size);
8665                         size += expr->ops->size;
8666                 }
8667                 if (WARN_ON_ONCE(size >= 1 << 12))
8668                         return -ENOMEM;
8669
8670                 prule->handle = rule->handle;
8671                 prule->dlen = size;
8672                 prule->is_last = 0;
8673
8674                 data += size;
8675                 size = 0;
8676                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
8677         }
8678
8679         prule = (struct nft_rule_dp *)data;
8680         data += offsetof(struct nft_rule_dp, data);
8681         if (WARN_ON_ONCE(data > data_boundary))
8682                 return -ENOMEM;
8683
8684         nft_last_rule(chain->blob_next, prule);
8685
8686         return 0;
8687 }
8688
8689 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8690 {
8691         struct nftables_pernet *nft_net = nft_pernet(net);
8692         struct nft_trans *trans, *next;
8693
8694         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8695                 struct nft_chain *chain = trans->ctx.chain;
8696
8697                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8698                     trans->msg_type == NFT_MSG_DELRULE) {
8699                         kvfree(chain->blob_next);
8700                         chain->blob_next = NULL;
8701                 }
8702         }
8703 }
8704
8705 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8706 {
8707         struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8708
8709         kvfree(o->blob);
8710 }
8711
8712 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
8713 {
8714         struct nft_rules_old *old;
8715
8716         /* rcu_head is after end marker */
8717         old = (void *)blob + sizeof(*blob) + blob->size;
8718         old->blob = blob;
8719
8720         call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8721 }
8722
8723 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8724 {
8725         struct nft_rule_blob *g0, *g1;
8726         bool next_genbit;
8727
8728         next_genbit = nft_gencursor_next(net);
8729
8730         g0 = rcu_dereference_protected(chain->blob_gen_0,
8731                                        lockdep_commit_lock_is_held(net));
8732         g1 = rcu_dereference_protected(chain->blob_gen_1,
8733                                        lockdep_commit_lock_is_held(net));
8734
8735         /* No changes to this chain? */
8736         if (chain->blob_next == NULL) {
8737                 /* chain had no change in last or next generation */
8738                 if (g0 == g1)
8739                         return;
8740                 /*
8741                  * chain had no change in this generation; make sure next
8742                  * one uses same rules as current generation.
8743                  */
8744                 if (next_genbit) {
8745                         rcu_assign_pointer(chain->blob_gen_1, g0);
8746                         nf_tables_commit_chain_free_rules_old(g1);
8747                 } else {
8748                         rcu_assign_pointer(chain->blob_gen_0, g1);
8749                         nf_tables_commit_chain_free_rules_old(g0);
8750                 }
8751
8752                 return;
8753         }
8754
8755         if (next_genbit)
8756                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
8757         else
8758                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
8759
8760         chain->blob_next = NULL;
8761
8762         if (g0 == g1)
8763                 return;
8764
8765         if (next_genbit)
8766                 nf_tables_commit_chain_free_rules_old(g1);
8767         else
8768                 nf_tables_commit_chain_free_rules_old(g0);
8769 }
8770
8771 static void nft_obj_del(struct nft_object *obj)
8772 {
8773         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8774         list_del_rcu(&obj->list);
8775 }
8776
8777 void nft_chain_del(struct nft_chain *chain)
8778 {
8779         struct nft_table *table = chain->table;
8780
8781         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8782                                      nft_chain_ht_params));
8783         list_del_rcu(&chain->list);
8784 }
8785
8786 static void nf_tables_module_autoload_cleanup(struct net *net)
8787 {
8788         struct nftables_pernet *nft_net = nft_pernet(net);
8789         struct nft_module_request *req, *next;
8790
8791         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8792         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8793                 WARN_ON_ONCE(!req->done);
8794                 list_del(&req->list);
8795                 kfree(req);
8796         }
8797 }
8798
8799 static void nf_tables_commit_release(struct net *net)
8800 {
8801         struct nftables_pernet *nft_net = nft_pernet(net);
8802         struct nft_trans *trans;
8803
8804         /* all side effects have to be made visible.
8805          * For example, if a chain named 'foo' has been deleted, a
8806          * new transaction must not find it anymore.
8807          *
8808          * Memory reclaim happens asynchronously from work queue
8809          * to prevent expensive synchronize_rcu() in commit phase.
8810          */
8811         if (list_empty(&nft_net->commit_list)) {
8812                 nf_tables_module_autoload_cleanup(net);
8813                 mutex_unlock(&nft_net->commit_mutex);
8814                 return;
8815         }
8816
8817         trans = list_last_entry(&nft_net->commit_list,
8818                                 struct nft_trans, list);
8819         get_net(trans->ctx.net);
8820         WARN_ON_ONCE(trans->put_net);
8821
8822         trans->put_net = true;
8823         spin_lock(&nf_tables_destroy_list_lock);
8824         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
8825         spin_unlock(&nf_tables_destroy_list_lock);
8826
8827         nf_tables_module_autoload_cleanup(net);
8828         schedule_work(&trans_destroy_work);
8829
8830         mutex_unlock(&nft_net->commit_mutex);
8831 }
8832
8833 static void nft_commit_notify(struct net *net, u32 portid)
8834 {
8835         struct nftables_pernet *nft_net = nft_pernet(net);
8836         struct sk_buff *batch_skb = NULL, *nskb, *skb;
8837         unsigned char *data;
8838         int len;
8839
8840         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
8841                 if (!batch_skb) {
8842 new_batch:
8843                         batch_skb = skb;
8844                         len = NLMSG_GOODSIZE - skb->len;
8845                         list_del(&skb->list);
8846                         continue;
8847                 }
8848                 len -= skb->len;
8849                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8850                         data = skb_put(batch_skb, skb->len);
8851                         memcpy(data, skb->data, skb->len);
8852                         list_del(&skb->list);
8853                         kfree_skb(skb);
8854                         continue;
8855                 }
8856                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8857                                NFT_CB(batch_skb).report, GFP_KERNEL);
8858                 goto new_batch;
8859         }
8860
8861         if (batch_skb) {
8862                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8863                                NFT_CB(batch_skb).report, GFP_KERNEL);
8864         }
8865
8866         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
8867 }
8868
8869 static int nf_tables_commit_audit_alloc(struct list_head *adl,
8870                                         struct nft_table *table)
8871 {
8872         struct nft_audit_data *adp;
8873
8874         list_for_each_entry(adp, adl, list) {
8875                 if (adp->table == table)
8876                         return 0;
8877         }
8878         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
8879         if (!adp)
8880                 return -ENOMEM;
8881         adp->table = table;
8882         list_add(&adp->list, adl);
8883         return 0;
8884 }
8885
8886 static void nf_tables_commit_audit_free(struct list_head *adl)
8887 {
8888         struct nft_audit_data *adp, *adn;
8889
8890         list_for_each_entry_safe(adp, adn, adl, list) {
8891                 list_del(&adp->list);
8892                 kfree(adp);
8893         }
8894 }
8895
8896 static void nf_tables_commit_audit_collect(struct list_head *adl,
8897                                            struct nft_table *table, u32 op)
8898 {
8899         struct nft_audit_data *adp;
8900
8901         list_for_each_entry(adp, adl, list) {
8902                 if (adp->table == table)
8903                         goto found;
8904         }
8905         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
8906         return;
8907 found:
8908         adp->entries++;
8909         if (!adp->op || adp->op > op)
8910                 adp->op = op;
8911 }
8912
8913 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
8914
8915 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
8916 {
8917         struct nft_audit_data *adp, *adn;
8918         char aubuf[AUNFTABLENAMELEN];
8919
8920         list_for_each_entry_safe(adp, adn, adl, list) {
8921                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
8922                          generation);
8923                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
8924                                 nft2audit_op[adp->op], GFP_KERNEL);
8925                 list_del(&adp->list);
8926                 kfree(adp);
8927         }
8928 }
8929
8930 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8931 {
8932         struct nftables_pernet *nft_net = nft_pernet(net);
8933         struct nft_trans *trans, *next;
8934         struct nft_trans_elem *te;
8935         struct nft_chain *chain;
8936         struct nft_table *table;
8937         unsigned int base_seq;
8938         LIST_HEAD(adl);
8939         int err;
8940
8941         if (list_empty(&nft_net->commit_list)) {
8942                 mutex_unlock(&nft_net->commit_mutex);
8943                 return 0;
8944         }
8945
8946         /* 0. Validate ruleset, otherwise roll back for error reporting. */
8947         if (nf_tables_validate(net) < 0)
8948                 return -EAGAIN;
8949
8950         err = nft_flow_rule_offload_commit(net);
8951         if (err < 0)
8952                 return err;
8953
8954         /* 1.  Allocate space for next generation rules_gen_X[] */
8955         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8956                 int ret;
8957
8958                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
8959                 if (ret) {
8960                         nf_tables_commit_chain_prepare_cancel(net);
8961                         nf_tables_commit_audit_free(&adl);
8962                         return ret;
8963                 }
8964                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8965                     trans->msg_type == NFT_MSG_DELRULE) {
8966                         chain = trans->ctx.chain;
8967
8968                         ret = nf_tables_commit_chain_prepare(net, chain);
8969                         if (ret < 0) {
8970                                 nf_tables_commit_chain_prepare_cancel(net);
8971                                 nf_tables_commit_audit_free(&adl);
8972                                 return ret;
8973                         }
8974                 }
8975         }
8976
8977         /* step 2.  Make rules_gen_X visible to packet path */
8978         list_for_each_entry(table, &nft_net->tables, list) {
8979                 list_for_each_entry(chain, &table->chains, list)
8980                         nf_tables_commit_chain(net, chain);
8981         }
8982
8983         /*
8984          * Bump generation counter, invalidate any dump in progress.
8985          * Cannot fail after this point.
8986          */
8987         base_seq = READ_ONCE(nft_net->base_seq);
8988         while (++base_seq == 0)
8989                 ;
8990
8991         WRITE_ONCE(nft_net->base_seq, base_seq);
8992
8993         /* step 3. Start new generation, rules_gen_X now in use. */
8994         net->nft.gencursor = nft_gencursor_next(net);
8995
8996         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8997                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
8998                                                trans->msg_type);
8999                 switch (trans->msg_type) {
9000                 case NFT_MSG_NEWTABLE:
9001                         if (nft_trans_table_update(trans)) {
9002                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9003                                         nft_trans_destroy(trans);
9004                                         break;
9005                                 }
9006                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9007                                         nf_tables_table_disable(net, trans->ctx.table);
9008
9009                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9010                         } else {
9011                                 nft_clear(net, trans->ctx.table);
9012                         }
9013                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
9014                         nft_trans_destroy(trans);
9015                         break;
9016                 case NFT_MSG_DELTABLE:
9017                         list_del_rcu(&trans->ctx.table->list);
9018                         nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
9019                         break;
9020                 case NFT_MSG_NEWCHAIN:
9021                         if (nft_trans_chain_update(trans)) {
9022                                 nft_chain_commit_update(trans);
9023                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
9024                                 /* trans destroyed after rcu grace period */
9025                         } else {
9026                                 nft_chain_commit_drop_policy(trans);
9027                                 nft_clear(net, trans->ctx.chain);
9028                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
9029                                 nft_trans_destroy(trans);
9030                         }
9031                         break;
9032                 case NFT_MSG_DELCHAIN:
9033                         nft_chain_del(trans->ctx.chain);
9034                         nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
9035                         nf_tables_unregister_hook(trans->ctx.net,
9036                                                   trans->ctx.table,
9037                                                   trans->ctx.chain);
9038                         break;
9039                 case NFT_MSG_NEWRULE:
9040                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9041                         nf_tables_rule_notify(&trans->ctx,
9042                                               nft_trans_rule(trans),
9043                                               NFT_MSG_NEWRULE);
9044                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9045                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9046
9047                         nft_trans_destroy(trans);
9048                         break;
9049                 case NFT_MSG_DELRULE:
9050                         list_del_rcu(&nft_trans_rule(trans)->list);
9051                         nf_tables_rule_notify(&trans->ctx,
9052                                               nft_trans_rule(trans),
9053                                               NFT_MSG_DELRULE);
9054                         nft_rule_expr_deactivate(&trans->ctx,
9055                                                  nft_trans_rule(trans),
9056                                                  NFT_TRANS_COMMIT);
9057
9058                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9059                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9060                         break;
9061                 case NFT_MSG_NEWSET:
9062                         nft_clear(net, nft_trans_set(trans));
9063                         /* This avoids hitting -EBUSY when deleting the table
9064                          * from the transaction.
9065                          */
9066                         if (nft_set_is_anonymous(nft_trans_set(trans)) &&
9067                             !list_empty(&nft_trans_set(trans)->bindings))
9068                                 trans->ctx.table->use--;
9069
9070                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9071                                              NFT_MSG_NEWSET, GFP_KERNEL);
9072                         nft_trans_destroy(trans);
9073                         break;
9074                 case NFT_MSG_DELSET:
9075                         list_del_rcu(&nft_trans_set(trans)->list);
9076                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9077                                              NFT_MSG_DELSET, GFP_KERNEL);
9078                         break;
9079                 case NFT_MSG_NEWSETELEM:
9080                         te = (struct nft_trans_elem *)trans->data;
9081
9082                         nft_setelem_activate(net, te->set, &te->elem);
9083                         nf_tables_setelem_notify(&trans->ctx, te->set,
9084                                                  &te->elem,
9085                                                  NFT_MSG_NEWSETELEM);
9086                         nft_trans_destroy(trans);
9087                         break;
9088                 case NFT_MSG_DELSETELEM:
9089                         te = (struct nft_trans_elem *)trans->data;
9090
9091                         nf_tables_setelem_notify(&trans->ctx, te->set,
9092                                                  &te->elem,
9093                                                  NFT_MSG_DELSETELEM);
9094                         nft_setelem_remove(net, te->set, &te->elem);
9095                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
9096                                 atomic_dec(&te->set->nelems);
9097                                 te->set->ndeact--;
9098                         }
9099                         break;
9100                 case NFT_MSG_NEWOBJ:
9101                         if (nft_trans_obj_update(trans)) {
9102                                 nft_obj_commit_update(trans);
9103                                 nf_tables_obj_notify(&trans->ctx,
9104                                                      nft_trans_obj(trans),
9105                                                      NFT_MSG_NEWOBJ);
9106                         } else {
9107                                 nft_clear(net, nft_trans_obj(trans));
9108                                 nf_tables_obj_notify(&trans->ctx,
9109                                                      nft_trans_obj(trans),
9110                                                      NFT_MSG_NEWOBJ);
9111                                 nft_trans_destroy(trans);
9112                         }
9113                         break;
9114                 case NFT_MSG_DELOBJ:
9115                         nft_obj_del(nft_trans_obj(trans));
9116                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
9117                                              NFT_MSG_DELOBJ);
9118                         break;
9119                 case NFT_MSG_NEWFLOWTABLE:
9120                         if (nft_trans_flowtable_update(trans)) {
9121                                 nft_trans_flowtable(trans)->data.flags =
9122                                         nft_trans_flowtable_flags(trans);
9123                                 nf_tables_flowtable_notify(&trans->ctx,
9124                                                            nft_trans_flowtable(trans),
9125                                                            &nft_trans_flowtable_hooks(trans),
9126                                                            NFT_MSG_NEWFLOWTABLE);
9127                                 list_splice(&nft_trans_flowtable_hooks(trans),
9128                                             &nft_trans_flowtable(trans)->hook_list);
9129                         } else {
9130                                 nft_clear(net, nft_trans_flowtable(trans));
9131                                 nf_tables_flowtable_notify(&trans->ctx,
9132                                                            nft_trans_flowtable(trans),
9133                                                            &nft_trans_flowtable(trans)->hook_list,
9134                                                            NFT_MSG_NEWFLOWTABLE);
9135                         }
9136                         nft_trans_destroy(trans);
9137                         break;
9138                 case NFT_MSG_DELFLOWTABLE:
9139                         if (nft_trans_flowtable_update(trans)) {
9140                                 nf_tables_flowtable_notify(&trans->ctx,
9141                                                            nft_trans_flowtable(trans),
9142                                                            &nft_trans_flowtable_hooks(trans),
9143                                                            NFT_MSG_DELFLOWTABLE);
9144                                 nft_unregister_flowtable_net_hooks(net,
9145                                                                    &nft_trans_flowtable_hooks(trans));
9146                         } else {
9147                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9148                                 nf_tables_flowtable_notify(&trans->ctx,
9149                                                            nft_trans_flowtable(trans),
9150                                                            &nft_trans_flowtable(trans)->hook_list,
9151                                                            NFT_MSG_DELFLOWTABLE);
9152                                 nft_unregister_flowtable_net_hooks(net,
9153                                                 &nft_trans_flowtable(trans)->hook_list);
9154                         }
9155                         break;
9156                 }
9157         }
9158
9159         nft_commit_notify(net, NETLINK_CB(skb).portid);
9160         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
9161         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
9162         nf_tables_commit_release(net);
9163
9164         return 0;
9165 }
9166
9167 static void nf_tables_module_autoload(struct net *net)
9168 {
9169         struct nftables_pernet *nft_net = nft_pernet(net);
9170         struct nft_module_request *req, *next;
9171         LIST_HEAD(module_list);
9172
9173         list_splice_init(&nft_net->module_list, &module_list);
9174         mutex_unlock(&nft_net->commit_mutex);
9175         list_for_each_entry_safe(req, next, &module_list, list) {
9176                 request_module("%s", req->module);
9177                 req->done = true;
9178         }
9179         mutex_lock(&nft_net->commit_mutex);
9180         list_splice(&module_list, &nft_net->module_list);
9181 }
9182
9183 static void nf_tables_abort_release(struct nft_trans *trans)
9184 {
9185         switch (trans->msg_type) {
9186         case NFT_MSG_NEWTABLE:
9187                 nf_tables_table_destroy(&trans->ctx);
9188                 break;
9189         case NFT_MSG_NEWCHAIN:
9190                 nf_tables_chain_destroy(&trans->ctx);
9191                 break;
9192         case NFT_MSG_NEWRULE:
9193                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9194                 break;
9195         case NFT_MSG_NEWSET:
9196                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9197                 break;
9198         case NFT_MSG_NEWSETELEM:
9199                 nft_set_elem_destroy(nft_trans_elem_set(trans),
9200                                      nft_trans_elem(trans).priv, true);
9201                 break;
9202         case NFT_MSG_NEWOBJ:
9203                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9204                 break;
9205         case NFT_MSG_NEWFLOWTABLE:
9206                 if (nft_trans_flowtable_update(trans))
9207                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9208                 else
9209                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9210                 break;
9211         }
9212         kfree(trans);
9213 }
9214
9215 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9216 {
9217         struct nftables_pernet *nft_net = nft_pernet(net);
9218         struct nft_trans *trans, *next;
9219         struct nft_trans_elem *te;
9220
9221         if (action == NFNL_ABORT_VALIDATE &&
9222             nf_tables_validate(net) < 0)
9223                 return -EAGAIN;
9224
9225         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9226                                          list) {
9227                 switch (trans->msg_type) {
9228                 case NFT_MSG_NEWTABLE:
9229                         if (nft_trans_table_update(trans)) {
9230                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9231                                         nft_trans_destroy(trans);
9232                                         break;
9233                                 }
9234                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9235                                         nf_tables_table_disable(net, trans->ctx.table);
9236                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9237                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9238                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9239                                 }
9240                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9241                                 nft_trans_destroy(trans);
9242                         } else {
9243                                 list_del_rcu(&trans->ctx.table->list);
9244                         }
9245                         break;
9246                 case NFT_MSG_DELTABLE:
9247                         nft_clear(trans->ctx.net, trans->ctx.table);
9248                         nft_trans_destroy(trans);
9249                         break;
9250                 case NFT_MSG_NEWCHAIN:
9251                         if (nft_trans_chain_update(trans)) {
9252                                 free_percpu(nft_trans_chain_stats(trans));
9253                                 kfree(nft_trans_chain_name(trans));
9254                                 nft_trans_destroy(trans);
9255                         } else {
9256                                 if (nft_chain_is_bound(trans->ctx.chain)) {
9257                                         nft_trans_destroy(trans);
9258                                         break;
9259                                 }
9260                                 trans->ctx.table->use--;
9261                                 nft_chain_del(trans->ctx.chain);
9262                                 nf_tables_unregister_hook(trans->ctx.net,
9263                                                           trans->ctx.table,
9264                                                           trans->ctx.chain);
9265                         }
9266                         break;
9267                 case NFT_MSG_DELCHAIN:
9268                         trans->ctx.table->use++;
9269                         nft_clear(trans->ctx.net, trans->ctx.chain);
9270                         nft_trans_destroy(trans);
9271                         break;
9272                 case NFT_MSG_NEWRULE:
9273                         trans->ctx.chain->use--;
9274                         list_del_rcu(&nft_trans_rule(trans)->list);
9275                         nft_rule_expr_deactivate(&trans->ctx,
9276                                                  nft_trans_rule(trans),
9277                                                  NFT_TRANS_ABORT);
9278                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9279                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9280                         break;
9281                 case NFT_MSG_DELRULE:
9282                         trans->ctx.chain->use++;
9283                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9284                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9285                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9286                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9287
9288                         nft_trans_destroy(trans);
9289                         break;
9290                 case NFT_MSG_NEWSET:
9291                         trans->ctx.table->use--;
9292                         if (nft_trans_set_bound(trans)) {
9293                                 nft_trans_destroy(trans);
9294                                 break;
9295                         }
9296                         list_del_rcu(&nft_trans_set(trans)->list);
9297                         break;
9298                 case NFT_MSG_DELSET:
9299                         trans->ctx.table->use++;
9300                         nft_clear(trans->ctx.net, nft_trans_set(trans));
9301                         nft_trans_destroy(trans);
9302                         break;
9303                 case NFT_MSG_NEWSETELEM:
9304                         if (nft_trans_elem_set_bound(trans)) {
9305                                 nft_trans_destroy(trans);
9306                                 break;
9307                         }
9308                         te = (struct nft_trans_elem *)trans->data;
9309                         nft_setelem_remove(net, te->set, &te->elem);
9310                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9311                                 atomic_dec(&te->set->nelems);
9312                         break;
9313                 case NFT_MSG_DELSETELEM:
9314                         te = (struct nft_trans_elem *)trans->data;
9315
9316                         nft_setelem_data_activate(net, te->set, &te->elem);
9317                         nft_setelem_activate(net, te->set, &te->elem);
9318                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9319                                 te->set->ndeact--;
9320
9321                         nft_trans_destroy(trans);
9322                         break;
9323                 case NFT_MSG_NEWOBJ:
9324                         if (nft_trans_obj_update(trans)) {
9325                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9326                                 nft_trans_destroy(trans);
9327                         } else {
9328                                 trans->ctx.table->use--;
9329                                 nft_obj_del(nft_trans_obj(trans));
9330                         }
9331                         break;
9332                 case NFT_MSG_DELOBJ:
9333                         trans->ctx.table->use++;
9334                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
9335                         nft_trans_destroy(trans);
9336                         break;
9337                 case NFT_MSG_NEWFLOWTABLE:
9338                         if (nft_trans_flowtable_update(trans)) {
9339                                 nft_unregister_flowtable_net_hooks(net,
9340                                                 &nft_trans_flowtable_hooks(trans));
9341                         } else {
9342                                 trans->ctx.table->use--;
9343                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9344                                 nft_unregister_flowtable_net_hooks(net,
9345                                                 &nft_trans_flowtable(trans)->hook_list);
9346                         }
9347                         break;
9348                 case NFT_MSG_DELFLOWTABLE:
9349                         if (nft_trans_flowtable_update(trans)) {
9350                                 list_splice(&nft_trans_flowtable_hooks(trans),
9351                                             &nft_trans_flowtable(trans)->hook_list);
9352                         } else {
9353                                 trans->ctx.table->use++;
9354                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9355                         }
9356                         nft_trans_destroy(trans);
9357                         break;
9358                 }
9359         }
9360
9361         synchronize_rcu();
9362
9363         list_for_each_entry_safe_reverse(trans, next,
9364                                          &nft_net->commit_list, list) {
9365                 list_del(&trans->list);
9366                 nf_tables_abort_release(trans);
9367         }
9368
9369         if (action == NFNL_ABORT_AUTOLOAD)
9370                 nf_tables_module_autoload(net);
9371         else
9372                 nf_tables_module_autoload_cleanup(net);
9373
9374         return 0;
9375 }
9376
9377 static void nf_tables_cleanup(struct net *net)
9378 {
9379         nft_validate_state_update(net, NFT_VALIDATE_SKIP);
9380 }
9381
9382 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9383                            enum nfnl_abort_action action)
9384 {
9385         struct nftables_pernet *nft_net = nft_pernet(net);
9386         int ret = __nf_tables_abort(net, action);
9387
9388         mutex_unlock(&nft_net->commit_mutex);
9389
9390         return ret;
9391 }
9392
9393 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9394 {
9395         struct nftables_pernet *nft_net = nft_pernet(net);
9396         bool genid_ok;
9397
9398         mutex_lock(&nft_net->commit_mutex);
9399
9400         genid_ok = genid == 0 || nft_net->base_seq == genid;
9401         if (!genid_ok)
9402                 mutex_unlock(&nft_net->commit_mutex);
9403
9404         /* else, commit mutex has to be released by commit or abort function */
9405         return genid_ok;
9406 }
9407
9408 static const struct nfnetlink_subsystem nf_tables_subsys = {
9409         .name           = "nf_tables",
9410         .subsys_id      = NFNL_SUBSYS_NFTABLES,
9411         .cb_count       = NFT_MSG_MAX,
9412         .cb             = nf_tables_cb,
9413         .commit         = nf_tables_commit,
9414         .abort          = nf_tables_abort,
9415         .cleanup        = nf_tables_cleanup,
9416         .valid_genid    = nf_tables_valid_genid,
9417         .owner          = THIS_MODULE,
9418 };
9419
9420 int nft_chain_validate_dependency(const struct nft_chain *chain,
9421                                   enum nft_chain_types type)
9422 {
9423         const struct nft_base_chain *basechain;
9424
9425         if (nft_is_base_chain(chain)) {
9426                 basechain = nft_base_chain(chain);
9427                 if (basechain->type->type != type)
9428                         return -EOPNOTSUPP;
9429         }
9430         return 0;
9431 }
9432 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9433
9434 int nft_chain_validate_hooks(const struct nft_chain *chain,
9435                              unsigned int hook_flags)
9436 {
9437         struct nft_base_chain *basechain;
9438
9439         if (nft_is_base_chain(chain)) {
9440                 basechain = nft_base_chain(chain);
9441
9442                 if ((1 << basechain->ops.hooknum) & hook_flags)
9443                         return 0;
9444
9445                 return -EOPNOTSUPP;
9446         }
9447
9448         return 0;
9449 }
9450 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9451
9452 /*
9453  * Loop detection - walk through the ruleset beginning at the destination chain
9454  * of a new jump until either the source chain is reached (loop) or all
9455  * reachable chains have been traversed.
9456  *
9457  * The loop check is performed whenever a new jump verdict is added to an
9458  * expression or verdict map or a verdict map is bound to a new chain.
9459  */
9460
9461 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9462                                  const struct nft_chain *chain);
9463
9464 static int nft_check_loops(const struct nft_ctx *ctx,
9465                            const struct nft_set_ext *ext)
9466 {
9467         const struct nft_data *data;
9468         int ret;
9469
9470         data = nft_set_ext_data(ext);
9471         switch (data->verdict.code) {
9472         case NFT_JUMP:
9473         case NFT_GOTO:
9474                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9475                 break;
9476         default:
9477                 ret = 0;
9478                 break;
9479         }
9480
9481         return ret;
9482 }
9483
9484 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9485                                         struct nft_set *set,
9486                                         const struct nft_set_iter *iter,
9487                                         struct nft_set_elem *elem)
9488 {
9489         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9490
9491         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9492             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9493                 return 0;
9494
9495         return nft_check_loops(ctx, ext);
9496 }
9497
9498 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9499                                   struct nft_set *set)
9500 {
9501         u8 genmask = nft_genmask_next(ctx->net);
9502         struct nft_set_elem_catchall *catchall;
9503         struct nft_set_ext *ext;
9504         int ret = 0;
9505
9506         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9507                 ext = nft_set_elem_ext(set, catchall->elem);
9508                 if (!nft_set_elem_active(ext, genmask))
9509                         continue;
9510
9511                 ret = nft_check_loops(ctx, ext);
9512                 if (ret < 0)
9513                         return ret;
9514         }
9515
9516         return ret;
9517 }
9518
9519 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9520                                  const struct nft_chain *chain)
9521 {
9522         const struct nft_rule *rule;
9523         const struct nft_expr *expr, *last;
9524         struct nft_set *set;
9525         struct nft_set_binding *binding;
9526         struct nft_set_iter iter;
9527
9528         if (ctx->chain == chain)
9529                 return -ELOOP;
9530
9531         list_for_each_entry(rule, &chain->rules, list) {
9532                 nft_rule_for_each_expr(expr, last, rule) {
9533                         struct nft_immediate_expr *priv;
9534                         const struct nft_data *data;
9535                         int err;
9536
9537                         if (strcmp(expr->ops->type->name, "immediate"))
9538                                 continue;
9539
9540                         priv = nft_expr_priv(expr);
9541                         if (priv->dreg != NFT_REG_VERDICT)
9542                                 continue;
9543
9544                         data = &priv->data;
9545                         switch (data->verdict.code) {
9546                         case NFT_JUMP:
9547                         case NFT_GOTO:
9548                                 err = nf_tables_check_loops(ctx,
9549                                                         data->verdict.chain);
9550                                 if (err < 0)
9551                                         return err;
9552                                 break;
9553                         default:
9554                                 break;
9555                         }
9556                 }
9557         }
9558
9559         list_for_each_entry(set, &ctx->table->sets, list) {
9560                 if (!nft_is_active_next(ctx->net, set))
9561                         continue;
9562                 if (!(set->flags & NFT_SET_MAP) ||
9563                     set->dtype != NFT_DATA_VERDICT)
9564                         continue;
9565
9566                 list_for_each_entry(binding, &set->bindings, list) {
9567                         if (!(binding->flags & NFT_SET_MAP) ||
9568                             binding->chain != chain)
9569                                 continue;
9570
9571                         iter.genmask    = nft_genmask_next(ctx->net);
9572                         iter.skip       = 0;
9573                         iter.count      = 0;
9574                         iter.err        = 0;
9575                         iter.fn         = nf_tables_loop_check_setelem;
9576
9577                         set->ops->walk(ctx, set, &iter);
9578                         if (!iter.err)
9579                                 iter.err = nft_set_catchall_loops(ctx, set);
9580
9581                         if (iter.err < 0)
9582                                 return iter.err;
9583                 }
9584         }
9585
9586         return 0;
9587 }
9588
9589 /**
9590  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
9591  *
9592  *      @attr: netlink attribute to fetch value from
9593  *      @max: maximum value to be stored in dest
9594  *      @dest: pointer to the variable
9595  *
9596  *      Parse, check and store a given u32 netlink attribute into variable.
9597  *      This function returns -ERANGE if the value goes over maximum value.
9598  *      Otherwise a 0 is returned and the attribute value is stored in the
9599  *      destination variable.
9600  */
9601 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9602 {
9603         u32 val;
9604
9605         val = ntohl(nla_get_be32(attr));
9606         if (val > max)
9607                 return -ERANGE;
9608
9609         *dest = val;
9610         return 0;
9611 }
9612 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9613
9614 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
9615 {
9616         unsigned int reg;
9617
9618         reg = ntohl(nla_get_be32(attr));
9619         switch (reg) {
9620         case NFT_REG_VERDICT...NFT_REG_4:
9621                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9622                 break;
9623         case NFT_REG32_00...NFT_REG32_15:
9624                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9625                 break;
9626         default:
9627                 return -ERANGE;
9628         }
9629
9630         return 0;
9631 }
9632
9633 /**
9634  *      nft_dump_register - dump a register value to a netlink attribute
9635  *
9636  *      @skb: socket buffer
9637  *      @attr: attribute number
9638  *      @reg: register number
9639  *
9640  *      Construct a netlink attribute containing the register number. For
9641  *      compatibility reasons, register numbers being a multiple of 4 are
9642  *      translated to the corresponding 128 bit register numbers.
9643  */
9644 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9645 {
9646         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9647                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9648         else
9649                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9650
9651         return nla_put_be32(skb, attr, htonl(reg));
9652 }
9653 EXPORT_SYMBOL_GPL(nft_dump_register);
9654
9655 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9656 {
9657         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9658                 return -EINVAL;
9659         if (len == 0)
9660                 return -EINVAL;
9661         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9662                 return -ERANGE;
9663
9664         return 0;
9665 }
9666
9667 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9668 {
9669         u32 reg;
9670         int err;
9671
9672         err = nft_parse_register(attr, &reg);
9673         if (err < 0)
9674                 return err;
9675
9676         err = nft_validate_register_load(reg, len);
9677         if (err < 0)
9678                 return err;
9679
9680         *sreg = reg;
9681         return 0;
9682 }
9683 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9684
9685 static int nft_validate_register_store(const struct nft_ctx *ctx,
9686                                        enum nft_registers reg,
9687                                        const struct nft_data *data,
9688                                        enum nft_data_types type,
9689                                        unsigned int len)
9690 {
9691         int err;
9692
9693         switch (reg) {
9694         case NFT_REG_VERDICT:
9695                 if (type != NFT_DATA_VERDICT)
9696                         return -EINVAL;
9697
9698                 if (data != NULL &&
9699                     (data->verdict.code == NFT_GOTO ||
9700                      data->verdict.code == NFT_JUMP)) {
9701                         err = nf_tables_check_loops(ctx, data->verdict.chain);
9702                         if (err < 0)
9703                                 return err;
9704                 }
9705
9706                 return 0;
9707         default:
9708                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9709                         return -EINVAL;
9710                 if (len == 0)
9711                         return -EINVAL;
9712                 if (reg * NFT_REG32_SIZE + len >
9713                     sizeof_field(struct nft_regs, data))
9714                         return -ERANGE;
9715
9716                 if (data != NULL && type != NFT_DATA_VALUE)
9717                         return -EINVAL;
9718                 return 0;
9719         }
9720 }
9721
9722 int nft_parse_register_store(const struct nft_ctx *ctx,
9723                              const struct nlattr *attr, u8 *dreg,
9724                              const struct nft_data *data,
9725                              enum nft_data_types type, unsigned int len)
9726 {
9727         int err;
9728         u32 reg;
9729
9730         err = nft_parse_register(attr, &reg);
9731         if (err < 0)
9732                 return err;
9733
9734         err = nft_validate_register_store(ctx, reg, data, type, len);
9735         if (err < 0)
9736                 return err;
9737
9738         *dreg = reg;
9739         return 0;
9740 }
9741 EXPORT_SYMBOL_GPL(nft_parse_register_store);
9742
9743 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9744         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
9745         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
9746                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
9747         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9748 };
9749
9750 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9751                             struct nft_data_desc *desc, const struct nlattr *nla)
9752 {
9753         u8 genmask = nft_genmask_next(ctx->net);
9754         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9755         struct nft_chain *chain;
9756         int err;
9757
9758         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9759                                           nft_verdict_policy, NULL);
9760         if (err < 0)
9761                 return err;
9762
9763         if (!tb[NFTA_VERDICT_CODE])
9764                 return -EINVAL;
9765         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9766
9767         switch (data->verdict.code) {
9768         default:
9769                 switch (data->verdict.code & NF_VERDICT_MASK) {
9770                 case NF_ACCEPT:
9771                 case NF_DROP:
9772                 case NF_QUEUE:
9773                         break;
9774                 default:
9775                         return -EINVAL;
9776                 }
9777                 fallthrough;
9778         case NFT_CONTINUE:
9779         case NFT_BREAK:
9780         case NFT_RETURN:
9781                 break;
9782         case NFT_JUMP:
9783         case NFT_GOTO:
9784                 if (tb[NFTA_VERDICT_CHAIN]) {
9785                         chain = nft_chain_lookup(ctx->net, ctx->table,
9786                                                  tb[NFTA_VERDICT_CHAIN],
9787                                                  genmask);
9788                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9789                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
9790                                                       tb[NFTA_VERDICT_CHAIN_ID]);
9791                         if (IS_ERR(chain))
9792                                 return PTR_ERR(chain);
9793                 } else {
9794                         return -EINVAL;
9795                 }
9796
9797                 if (IS_ERR(chain))
9798                         return PTR_ERR(chain);
9799                 if (nft_is_base_chain(chain))
9800                         return -EOPNOTSUPP;
9801                 if (nft_chain_is_bound(chain))
9802                         return -EINVAL;
9803                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
9804                     chain->flags & NFT_CHAIN_BINDING)
9805                         return -EINVAL;
9806
9807                 chain->use++;
9808                 data->verdict.chain = chain;
9809                 break;
9810         }
9811
9812         desc->len = sizeof(data->verdict);
9813
9814         return 0;
9815 }
9816
9817 static void nft_verdict_uninit(const struct nft_data *data)
9818 {
9819         struct nft_chain *chain;
9820         struct nft_rule *rule;
9821
9822         switch (data->verdict.code) {
9823         case NFT_JUMP:
9824         case NFT_GOTO:
9825                 chain = data->verdict.chain;
9826                 chain->use--;
9827
9828                 if (!nft_chain_is_bound(chain))
9829                         break;
9830
9831                 chain->table->use--;
9832                 list_for_each_entry(rule, &chain->rules, list)
9833                         chain->use--;
9834
9835                 nft_chain_del(chain);
9836                 break;
9837         }
9838 }
9839
9840 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
9841 {
9842         struct nlattr *nest;
9843
9844         nest = nla_nest_start_noflag(skb, type);
9845         if (!nest)
9846                 goto nla_put_failure;
9847
9848         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
9849                 goto nla_put_failure;
9850
9851         switch (v->code) {
9852         case NFT_JUMP:
9853         case NFT_GOTO:
9854                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
9855                                    v->chain->name))
9856                         goto nla_put_failure;
9857         }
9858         nla_nest_end(skb, nest);
9859         return 0;
9860
9861 nla_put_failure:
9862         return -1;
9863 }
9864
9865 static int nft_value_init(const struct nft_ctx *ctx,
9866                           struct nft_data *data, struct nft_data_desc *desc,
9867                           const struct nlattr *nla)
9868 {
9869         unsigned int len;
9870
9871         len = nla_len(nla);
9872         if (len == 0)
9873                 return -EINVAL;
9874         if (len > desc->size)
9875                 return -EOVERFLOW;
9876         if (desc->len) {
9877                 if (len != desc->len)
9878                         return -EINVAL;
9879         } else {
9880                 desc->len = len;
9881         }
9882
9883         nla_memcpy(data->data, nla, len);
9884
9885         return 0;
9886 }
9887
9888 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
9889                           unsigned int len)
9890 {
9891         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
9892 }
9893
9894 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
9895         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
9896         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
9897 };
9898
9899 /**
9900  *      nft_data_init - parse nf_tables data netlink attributes
9901  *
9902  *      @ctx: context of the expression using the data
9903  *      @data: destination struct nft_data
9904  *      @desc: data description
9905  *      @nla: netlink attribute containing data
9906  *
9907  *      Parse the netlink data attributes and initialize a struct nft_data.
9908  *      The type and length of data are returned in the data description.
9909  *
9910  *      The caller can indicate that it only wants to accept data of type
9911  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
9912  */
9913 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
9914                   struct nft_data_desc *desc, const struct nlattr *nla)
9915 {
9916         struct nlattr *tb[NFTA_DATA_MAX + 1];
9917         int err;
9918
9919         if (WARN_ON_ONCE(!desc->size))
9920                 return -EINVAL;
9921
9922         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
9923                                           nft_data_policy, NULL);
9924         if (err < 0)
9925                 return err;
9926
9927         if (tb[NFTA_DATA_VALUE]) {
9928                 if (desc->type != NFT_DATA_VALUE)
9929                         return -EINVAL;
9930
9931                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
9932         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
9933                 if (desc->type != NFT_DATA_VERDICT)
9934                         return -EINVAL;
9935
9936                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
9937         } else {
9938                 err = -EINVAL;
9939         }
9940
9941         return err;
9942 }
9943 EXPORT_SYMBOL_GPL(nft_data_init);
9944
9945 /**
9946  *      nft_data_release - release a nft_data item
9947  *
9948  *      @data: struct nft_data to release
9949  *      @type: type of data
9950  *
9951  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
9952  *      all others need to be released by calling this function.
9953  */
9954 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
9955 {
9956         if (type < NFT_DATA_VERDICT)
9957                 return;
9958         switch (type) {
9959         case NFT_DATA_VERDICT:
9960                 return nft_verdict_uninit(data);
9961         default:
9962                 WARN_ON(1);
9963         }
9964 }
9965 EXPORT_SYMBOL_GPL(nft_data_release);
9966
9967 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9968                   enum nft_data_types type, unsigned int len)
9969 {
9970         struct nlattr *nest;
9971         int err;
9972
9973         nest = nla_nest_start_noflag(skb, attr);
9974         if (nest == NULL)
9975                 return -1;
9976
9977         switch (type) {
9978         case NFT_DATA_VALUE:
9979                 err = nft_value_dump(skb, data, len);
9980                 break;
9981         case NFT_DATA_VERDICT:
9982                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
9983                 break;
9984         default:
9985                 err = -EINVAL;
9986                 WARN_ON(1);
9987         }
9988
9989         nla_nest_end(skb, nest);
9990         return err;
9991 }
9992 EXPORT_SYMBOL_GPL(nft_data_dump);
9993
9994 int __nft_release_basechain(struct nft_ctx *ctx)
9995 {
9996         struct nft_rule *rule, *nr;
9997
9998         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9999                 return 0;
10000
10001         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
10002         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
10003                 list_del(&rule->list);
10004                 ctx->chain->use--;
10005                 nf_tables_rule_release(ctx, rule);
10006         }
10007         nft_chain_del(ctx->chain);
10008         ctx->table->use--;
10009         nf_tables_chain_destroy(ctx);
10010
10011         return 0;
10012 }
10013 EXPORT_SYMBOL_GPL(__nft_release_basechain);
10014
10015 static void __nft_release_hook(struct net *net, struct nft_table *table)
10016 {
10017         struct nft_flowtable *flowtable;
10018         struct nft_chain *chain;
10019
10020         list_for_each_entry(chain, &table->chains, list)
10021                 __nf_tables_unregister_hook(net, table, chain, true);
10022         list_for_each_entry(flowtable, &table->flowtables, list)
10023                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
10024                                                      true);
10025 }
10026
10027 static void __nft_release_hooks(struct net *net)
10028 {
10029         struct nftables_pernet *nft_net = nft_pernet(net);
10030         struct nft_table *table;
10031
10032         list_for_each_entry(table, &nft_net->tables, list) {
10033                 if (nft_table_has_owner(table))
10034                         continue;
10035
10036                 __nft_release_hook(net, table);
10037         }
10038 }
10039
10040 static void __nft_release_table(struct net *net, struct nft_table *table)
10041 {
10042         struct nft_flowtable *flowtable, *nf;
10043         struct nft_chain *chain, *nc;
10044         struct nft_object *obj, *ne;
10045         struct nft_rule *rule, *nr;
10046         struct nft_set *set, *ns;
10047         struct nft_ctx ctx = {
10048                 .net    = net,
10049                 .family = NFPROTO_NETDEV,
10050         };
10051
10052         ctx.family = table->family;
10053         ctx.table = table;
10054         list_for_each_entry(chain, &table->chains, list) {
10055                 ctx.chain = chain;
10056                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
10057                         list_del(&rule->list);
10058                         chain->use--;
10059                         nf_tables_rule_release(&ctx, rule);
10060                 }
10061         }
10062         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
10063                 list_del(&flowtable->list);
10064                 table->use--;
10065                 nf_tables_flowtable_destroy(flowtable);
10066         }
10067         list_for_each_entry_safe(set, ns, &table->sets, list) {
10068                 list_del(&set->list);
10069                 table->use--;
10070                 nft_set_destroy(&ctx, set);
10071         }
10072         list_for_each_entry_safe(obj, ne, &table->objects, list) {
10073                 nft_obj_del(obj);
10074                 table->use--;
10075                 nft_obj_destroy(&ctx, obj);
10076         }
10077         list_for_each_entry_safe(chain, nc, &table->chains, list) {
10078                 ctx.chain = chain;
10079                 nft_chain_del(chain);
10080                 table->use--;
10081                 nf_tables_chain_destroy(&ctx);
10082         }
10083         nf_tables_table_destroy(&ctx);
10084 }
10085
10086 static void __nft_release_tables(struct net *net)
10087 {
10088         struct nftables_pernet *nft_net = nft_pernet(net);
10089         struct nft_table *table, *nt;
10090
10091         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
10092                 if (nft_table_has_owner(table))
10093                         continue;
10094
10095                 list_del(&table->list);
10096
10097                 __nft_release_table(net, table);
10098         }
10099 }
10100
10101 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
10102                             void *ptr)
10103 {
10104         struct nft_table *table, *to_delete[8];
10105         struct nftables_pernet *nft_net;
10106         struct netlink_notify *n = ptr;
10107         struct net *net = n->net;
10108         unsigned int deleted;
10109         bool restart = false;
10110
10111         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
10112                 return NOTIFY_DONE;
10113
10114         nft_net = nft_pernet(net);
10115         deleted = 0;
10116         mutex_lock(&nft_net->commit_mutex);
10117         if (!list_empty(&nf_tables_destroy_list))
10118                 rcu_barrier();
10119 again:
10120         list_for_each_entry(table, &nft_net->tables, list) {
10121                 if (nft_table_has_owner(table) &&
10122                     n->portid == table->nlpid) {
10123                         __nft_release_hook(net, table);
10124                         list_del_rcu(&table->list);
10125                         to_delete[deleted++] = table;
10126                         if (deleted >= ARRAY_SIZE(to_delete))
10127                                 break;
10128                 }
10129         }
10130         if (deleted) {
10131                 restart = deleted >= ARRAY_SIZE(to_delete);
10132                 synchronize_rcu();
10133                 while (deleted)
10134                         __nft_release_table(net, to_delete[--deleted]);
10135
10136                 if (restart)
10137                         goto again;
10138         }
10139         mutex_unlock(&nft_net->commit_mutex);
10140
10141         return NOTIFY_DONE;
10142 }
10143
10144 static struct notifier_block nft_nl_notifier = {
10145         .notifier_call  = nft_rcv_nl_event,
10146 };
10147
10148 static int __net_init nf_tables_init_net(struct net *net)
10149 {
10150         struct nftables_pernet *nft_net = nft_pernet(net);
10151
10152         INIT_LIST_HEAD(&nft_net->tables);
10153         INIT_LIST_HEAD(&nft_net->commit_list);
10154         INIT_LIST_HEAD(&nft_net->module_list);
10155         INIT_LIST_HEAD(&nft_net->notify_list);
10156         mutex_init(&nft_net->commit_mutex);
10157         nft_net->base_seq = 1;
10158         nft_net->validate_state = NFT_VALIDATE_SKIP;
10159
10160         return 0;
10161 }
10162
10163 static void __net_exit nf_tables_pre_exit_net(struct net *net)
10164 {
10165         struct nftables_pernet *nft_net = nft_pernet(net);
10166
10167         mutex_lock(&nft_net->commit_mutex);
10168         __nft_release_hooks(net);
10169         mutex_unlock(&nft_net->commit_mutex);
10170 }
10171
10172 static void __net_exit nf_tables_exit_net(struct net *net)
10173 {
10174         struct nftables_pernet *nft_net = nft_pernet(net);
10175
10176         mutex_lock(&nft_net->commit_mutex);
10177         if (!list_empty(&nft_net->commit_list) ||
10178             !list_empty(&nft_net->module_list))
10179                 __nf_tables_abort(net, NFNL_ABORT_NONE);
10180         __nft_release_tables(net);
10181         mutex_unlock(&nft_net->commit_mutex);
10182         WARN_ON_ONCE(!list_empty(&nft_net->tables));
10183         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
10184         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10185 }
10186
10187 static struct pernet_operations nf_tables_net_ops = {
10188         .init           = nf_tables_init_net,
10189         .pre_exit       = nf_tables_pre_exit_net,
10190         .exit           = nf_tables_exit_net,
10191         .id             = &nf_tables_net_id,
10192         .size           = sizeof(struct nftables_pernet),
10193 };
10194
10195 static int __init nf_tables_module_init(void)
10196 {
10197         int err;
10198
10199         err = register_pernet_subsys(&nf_tables_net_ops);
10200         if (err < 0)
10201                 return err;
10202
10203         err = nft_chain_filter_init();
10204         if (err < 0)
10205                 goto err_chain_filter;
10206
10207         err = nf_tables_core_module_init();
10208         if (err < 0)
10209                 goto err_core_module;
10210
10211         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10212         if (err < 0)
10213                 goto err_netdev_notifier;
10214
10215         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10216         if (err < 0)
10217                 goto err_rht_objname;
10218
10219         err = nft_offload_init();
10220         if (err < 0)
10221                 goto err_offload;
10222
10223         err = netlink_register_notifier(&nft_nl_notifier);
10224         if (err < 0)
10225                 goto err_netlink_notifier;
10226
10227         /* must be last */
10228         err = nfnetlink_subsys_register(&nf_tables_subsys);
10229         if (err < 0)
10230                 goto err_nfnl_subsys;
10231
10232         nft_chain_route_init();
10233
10234         return err;
10235
10236 err_nfnl_subsys:
10237         netlink_unregister_notifier(&nft_nl_notifier);
10238 err_netlink_notifier:
10239         nft_offload_exit();
10240 err_offload:
10241         rhltable_destroy(&nft_objname_ht);
10242 err_rht_objname:
10243         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10244 err_netdev_notifier:
10245         nf_tables_core_module_exit();
10246 err_core_module:
10247         nft_chain_filter_fini();
10248 err_chain_filter:
10249         unregister_pernet_subsys(&nf_tables_net_ops);
10250         return err;
10251 }
10252
10253 static void __exit nf_tables_module_exit(void)
10254 {
10255         nfnetlink_subsys_unregister(&nf_tables_subsys);
10256         netlink_unregister_notifier(&nft_nl_notifier);
10257         nft_offload_exit();
10258         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10259         nft_chain_filter_fini();
10260         nft_chain_route_fini();
10261         unregister_pernet_subsys(&nf_tables_net_ops);
10262         cancel_work_sync(&trans_destroy_work);
10263         rcu_barrier();
10264         rhltable_destroy(&nft_objname_ht);
10265         nf_tables_core_module_exit();
10266 }
10267
10268 module_init(nf_tables_module_init);
10269 module_exit(nf_tables_module_exit);
10270
10271 MODULE_LICENSE("GPL");
10272 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10273 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);