net/netfilter/nf_tables_api.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
   4  *
   5  * Development of this code funded by Astaro AG (http://www.astaro.com/)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/list.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/netlink.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/rhashtable.h>
  15 #include <linux/audit.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter/nfnetlink.h>
  18 #include <linux/netfilter/nf_tables.h>
  19 #include <net/netfilter/nf_flow_table.h>
  20 #include <net/netfilter/nf_tables_core.h>
  21 #include <net/netfilter/nf_tables.h>
  22 #include <net/netfilter/nf_tables_offload.h>
  23 #include <net/net_namespace.h>
  24 #include <net/sock.h>
  25
  26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
  27
  28 unsigned int nf_tables_net_id __read_mostly;
  29
  30 static LIST_HEAD(nf_tables_expressions);
  31 static LIST_HEAD(nf_tables_objects);
  32 static LIST_HEAD(nf_tables_flowtables);
  33 static LIST_HEAD(nf_tables_destroy_list);
  34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  35 static u64 table_handle;
  36
  37 enum {
  38         NFT_VALIDATE_SKIP       = 0,
  39         NFT_VALIDATE_NEED,
  40         NFT_VALIDATE_DO,
  41 };
  42
  43 static struct rhltable nft_objname_ht;
  44
  45 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  46 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  47 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  48
  49 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  50 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  51 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  52
  53 static const struct rhashtable_params nft_chain_ht_params = {
  54         .head_offset            = offsetof(struct nft_chain, rhlhead),
  55         .key_offset             = offsetof(struct nft_chain, name),
  56         .hashfn                 = nft_chain_hash,
  57         .obj_hashfn             = nft_chain_hash_obj,
  58         .obj_cmpfn              = nft_chain_hash_cmp,
  59         .automatic_shrinking    = true,
  60 };
  61
  62 static const struct rhashtable_params nft_objname_ht_params = {
  63         .head_offset            = offsetof(struct nft_object, rhlhead),
  64         .key_offset             = offsetof(struct nft_object, key),
  65         .hashfn                 = nft_objname_hash,
  66         .obj_hashfn             = nft_objname_hash_obj,
  67         .obj_cmpfn              = nft_objname_hash_cmp,
  68         .automatic_shrinking    = true,
  69 };
  70
  71 struct nft_audit_data {
  72         struct nft_table *table;
  73         int entries;
  74         int op;
  75         struct list_head list;
  76 };
  77
  78 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  79         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  80         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  81         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  82         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  83         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  84         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  85         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  86         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  87         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  88         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  89         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  90         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  91         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  92         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  93         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  94         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  95         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  96         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  97         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
  98         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
  99         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
 100         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 101         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 102         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 103         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 104 };
 105
 106 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
 107 {
 108         struct nftables_pernet *nft_net = nft_pernet(net);
 109
 110         switch (nft_net->validate_state) {
 111         case NFT_VALIDATE_SKIP:
 112                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 113                 break;
 114         case NFT_VALIDATE_NEED:
 115                 break;
 116         case NFT_VALIDATE_DO:
 117                 if (new_validate_state == NFT_VALIDATE_NEED)
 118                         return;
 119         }
 120
 121         nft_net->validate_state = new_validate_state;
 122 }
 123 static void nf_tables_trans_destroy_work(struct work_struct *w);
 124 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 125
 126 static void nft_ctx_init(struct nft_ctx *ctx,
 127                          struct net *net,
 128                          const struct sk_buff *skb,
 129                          const struct nlmsghdr *nlh,
 130                          u8 family,
 131                          struct nft_table *table,
 132                          struct nft_chain *chain,
 133                          const struct nlattr * const *nla)
 134 {
 135         ctx->net        = net;
 136         ctx->family     = family;
 137         ctx->level      = 0;
 138         ctx->table      = table;
 139         ctx->chain      = chain;
 140         ctx->nla        = nla;
 141         ctx->portid     = NETLINK_CB(skb).portid;
 142         ctx->report     = nlmsg_report(nlh);
 143         ctx->flags      = nlh->nlmsg_flags;
 144         ctx->seq        = nlh->nlmsg_seq;
 145 }
 146
 147 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 148                                              int msg_type, u32 size, gfp_t gfp)
 149 {
 150         struct nft_trans *trans;
 151
 152         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 153         if (trans == NULL)
 154                 return NULL;
 155
 156         INIT_LIST_HEAD(&trans->list);
 157         trans->msg_type = msg_type;
 158         trans->ctx      = *ctx;
 159
 160         return trans;
 161 }
 162
 163 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 164                                          int msg_type, u32 size)
 165 {
 166         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 167 }
 168
 169 static void nft_trans_destroy(struct nft_trans *trans)
 170 {
 171         list_del(&trans->list);
 172         kfree(trans);
 173 }
 174
 175 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 176 {
 177         struct nftables_pernet *nft_net;
 178         struct net *net = ctx->net;
 179         struct nft_trans *trans;
 180
 181         if (!nft_set_is_anonymous(set))
 182                 return;
 183
 184         nft_net = nft_pernet(net);
 185         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 186                 switch (trans->msg_type) {
 187                 case NFT_MSG_NEWSET:
 188                         if (nft_trans_set(trans) == set)
 189                                 nft_trans_set_bound(trans) = true;
 190                         break;
 191                 case NFT_MSG_NEWSETELEM:
 192                         if (nft_trans_elem_set(trans) == set)
 193                                 nft_trans_elem_set_bound(trans) = true;
 194                         break;
 195                 }
 196         }
 197 }
 198
 199 static int nft_netdev_register_hooks(struct net *net,
 200                                      struct list_head *hook_list)
 201 {
 202         struct nft_hook *hook;
 203         int err, j;
 204
 205         j = 0;
 206         list_for_each_entry(hook, hook_list, list) {
 207                 err = nf_register_net_hook(net, &hook->ops);
 208                 if (err < 0)
 209                         goto err_register;
 210
 211                 j++;
 212         }
 213         return 0;
 214
 215 err_register:
 216         list_for_each_entry(hook, hook_list, list) {
 217                 if (j-- <= 0)
 218                         break;
 219
 220                 nf_unregister_net_hook(net, &hook->ops);
 221         }
 222         return err;
 223 }
 224
 225 static void nft_netdev_unregister_hooks(struct net *net,
 226                                         struct list_head *hook_list,
 227                                         bool release_netdev)
 228 {
 229         struct nft_hook *hook, *next;
 230
 231         list_for_each_entry_safe(hook, next, hook_list, list) {
 232                 nf_unregister_net_hook(net, &hook->ops);
 233                 if (release_netdev) {
 234                         list_del(&hook->list);
 235                         kfree_rcu(hook, rcu);
 236                 }
 237         }
 238 }
 239
 240 static int nf_tables_register_hook(struct net *net,
 241                                    const struct nft_table *table,
 242                                    struct nft_chain *chain)
 243 {
 244         struct nft_base_chain *basechain;
 245         const struct nf_hook_ops *ops;
 246
 247         if (table->flags & NFT_TABLE_F_DORMANT ||
 248             !nft_is_base_chain(chain))
 249                 return 0;
 250
 251         basechain = nft_base_chain(chain);
 252         ops = &basechain->ops;
 253
 254         if (basechain->type->ops_register)
 255                 return basechain->type->ops_register(net, ops);
 256
 257         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 258                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 259
 260         return nf_register_net_hook(net, &basechain->ops);
 261 }
 262
 263 static void __nf_tables_unregister_hook(struct net *net,
 264                                         const struct nft_table *table,
 265                                         struct nft_chain *chain,
 266                                         bool release_netdev)
 267 {
 268         struct nft_base_chain *basechain;
 269         const struct nf_hook_ops *ops;
 270
 271         if (table->flags & NFT_TABLE_F_DORMANT ||
 272             !nft_is_base_chain(chain))
 273                 return;
 274         basechain = nft_base_chain(chain);
 275         ops = &basechain->ops;
 276
 277         if (basechain->type->ops_unregister)
 278                 return basechain->type->ops_unregister(net, ops);
 279
 280         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 281                 nft_netdev_unregister_hooks(net, &basechain->hook_list,
 282                                             release_netdev);
 283         else
 284                 nf_unregister_net_hook(net, &basechain->ops);
 285 }
 286
 287 static void nf_tables_unregister_hook(struct net *net,
 288                                       const struct nft_table *table,
 289                                       struct nft_chain *chain)
 290 {
 291         return __nf_tables_unregister_hook(net, table, chain, false);
 292 }
 293
 294 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 295 {
 296         struct nftables_pernet *nft_net = nft_pernet(net);
 297
 298         list_add_tail(&trans->list, &nft_net->commit_list);
 299 }
 300
 301 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 302 {
 303         struct nft_trans *trans;
 304
 305         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 306         if (trans == NULL)
 307                 return -ENOMEM;
 308
 309         if (msg_type == NFT_MSG_NEWTABLE)
 310                 nft_activate_next(ctx->net, ctx->table);
 311
 312         nft_trans_commit_list_add_tail(ctx->net, trans);
 313         return 0;
 314 }
 315
 316 static int nft_deltable(struct nft_ctx *ctx)
 317 {
 318         int err;
 319
 320         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 321         if (err < 0)
 322                 return err;
 323
 324         nft_deactivate_next(ctx->net, ctx->table);
 325         return err;
 326 }
 327
 328 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 329 {
 330         struct nft_trans *trans;
 331
 332         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 333         if (trans == NULL)
 334                 return ERR_PTR(-ENOMEM);
 335
 336         if (msg_type == NFT_MSG_NEWCHAIN) {
 337                 nft_activate_next(ctx->net, ctx->chain);
 338
 339                 if (ctx->nla[NFTA_CHAIN_ID]) {
 340                         nft_trans_chain_id(trans) =
 341                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 342                 }
 343         }
 344
 345         nft_trans_commit_list_add_tail(ctx->net, trans);
 346         return trans;
 347 }
 348
 349 static int nft_delchain(struct nft_ctx *ctx)
 350 {
 351         struct nft_trans *trans;
 352
 353         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 354         if (IS_ERR(trans))
 355                 return PTR_ERR(trans);
 356
 357         ctx->table->use--;
 358         nft_deactivate_next(ctx->net, ctx->chain);
 359
 360         return 0;
 361 }
 362
 363 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
 364                                    struct nft_rule *rule)
 365 {
 366         struct nft_expr *expr;
 367
 368         expr = nft_expr_first(rule);
 369         while (nft_expr_more(rule, expr)) {
 370                 if (expr->ops->activate)
 371                         expr->ops->activate(ctx, expr);
 372
 373                 expr = nft_expr_next(expr);
 374         }
 375 }
 376
 377 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
 378                                      struct nft_rule *rule,
 379                                      enum nft_trans_phase phase)
 380 {
 381         struct nft_expr *expr;
 382
 383         expr = nft_expr_first(rule);
 384         while (nft_expr_more(rule, expr)) {
 385                 if (expr->ops->deactivate)
 386                         expr->ops->deactivate(ctx, expr, phase);
 387
 388                 expr = nft_expr_next(expr);
 389         }
 390 }
 391
 392 static int
 393 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 394 {
 395         /* You cannot delete the same rule twice */
 396         if (nft_is_active_next(ctx->net, rule)) {
 397                 nft_deactivate_next(ctx->net, rule);
 398                 ctx->chain->use--;
 399                 return 0;
 400         }
 401         return -ENOENT;
 402 }
 403
 404 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 405                                             struct nft_rule *rule)
 406 {
 407         struct nft_trans *trans;
 408
 409         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 410         if (trans == NULL)
 411                 return NULL;
 412
 413         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 414                 nft_trans_rule_id(trans) =
 415                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 416         }
 417         nft_trans_rule(trans) = rule;
 418         nft_trans_commit_list_add_tail(ctx->net, trans);
 419
 420         return trans;
 421 }
 422
 423 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 424 {
 425         struct nft_flow_rule *flow;
 426         struct nft_trans *trans;
 427         int err;
 428
 429         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 430         if (trans == NULL)
 431                 return -ENOMEM;
 432
 433         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 434                 flow = nft_flow_rule_create(ctx->net, rule);
 435                 if (IS_ERR(flow)) {
 436                         nft_trans_destroy(trans);
 437                         return PTR_ERR(flow);
 438                 }
 439
 440                 nft_trans_flow_rule(trans) = flow;
 441         }
 442
 443         err = nf_tables_delrule_deactivate(ctx, rule);
 444         if (err < 0) {
 445                 nft_trans_destroy(trans);
 446                 return err;
 447         }
 448         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 449
 450         return 0;
 451 }
 452
 453 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 454 {
 455         struct nft_rule *rule;
 456         int err;
 457
 458         list_for_each_entry(rule, &ctx->chain->rules, list) {
 459                 if (!nft_is_active_next(ctx->net, rule))
 460                         continue;
 461
 462                 err = nft_delrule(ctx, rule);
 463                 if (err < 0)
 464                         return err;
 465         }
 466         return 0;
 467 }
 468
 469 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 470                              struct nft_set *set)
 471 {
 472         struct nft_trans *trans;
 473
 474         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 475         if (trans == NULL)
 476                 return -ENOMEM;
 477
 478         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
 479                 nft_trans_set_id(trans) =
 480                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 481                 nft_activate_next(ctx->net, set);
 482         }
 483         nft_trans_set(trans) = set;
 484         nft_trans_commit_list_add_tail(ctx->net, trans);
 485
 486         return 0;
 487 }
 488
 489 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 490 {
 491         int err;
 492
 493         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 494         if (err < 0)
 495                 return err;
 496
 497         nft_deactivate_next(ctx->net, set);
 498         ctx->table->use--;
 499
 500         return err;
 501 }
 502
 503 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 504                              struct nft_object *obj)
 505 {
 506         struct nft_trans *trans;
 507
 508         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 509         if (trans == NULL)
 510                 return -ENOMEM;
 511
 512         if (msg_type == NFT_MSG_NEWOBJ)
 513                 nft_activate_next(ctx->net, obj);
 514
 515         nft_trans_obj(trans) = obj;
 516         nft_trans_commit_list_add_tail(ctx->net, trans);
 517
 518         return 0;
 519 }
 520
 521 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 522 {
 523         int err;
 524
 525         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 526         if (err < 0)
 527                 return err;
 528
 529         nft_deactivate_next(ctx->net, obj);
 530         ctx->table->use--;
 531
 532         return err;
 533 }
 534
 535 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 536                                    struct nft_flowtable *flowtable)
 537 {
 538         struct nft_trans *trans;
 539
 540         trans = nft_trans_alloc(ctx, msg_type,
 541                                 sizeof(struct nft_trans_flowtable));
 542         if (trans == NULL)
 543                 return -ENOMEM;
 544
 545         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 546                 nft_activate_next(ctx->net, flowtable);
 547
 548         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
 549         nft_trans_flowtable(trans) = flowtable;
 550         nft_trans_commit_list_add_tail(ctx->net, trans);
 551
 552         return 0;
 553 }
 554
 555 static int nft_delflowtable(struct nft_ctx *ctx,
 556                             struct nft_flowtable *flowtable)
 557 {
 558         int err;
 559
 560         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 561         if (err < 0)
 562                 return err;
 563
 564         nft_deactivate_next(ctx->net, flowtable);
 565         ctx->table->use--;
 566
 567         return err;
 568 }
 569
 570 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
 571 {
 572         int i;
 573
 574         for (i = track->regs[dreg].num_reg; i > 0; i--)
 575                 __nft_reg_track_cancel(track, dreg - i);
 576 }
 577
 578 static void __nft_reg_track_update(struct nft_regs_track *track,
 579                                    const struct nft_expr *expr,
 580                                    u8 dreg, u8 num_reg)
 581 {
 582         track->regs[dreg].selector = expr;
 583         track->regs[dreg].bitwise = NULL;
 584         track->regs[dreg].num_reg = num_reg;
 585 }
 586
 587 void nft_reg_track_update(struct nft_regs_track *track,
 588                           const struct nft_expr *expr, u8 dreg, u8 len)
 589 {
 590         unsigned int regcount;
 591         int i;
 592
 593         __nft_reg_track_clobber(track, dreg);
 594
 595         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 596         for (i = 0; i < regcount; i++, dreg++)
 597                 __nft_reg_track_update(track, expr, dreg, i);
 598 }
 599 EXPORT_SYMBOL_GPL(nft_reg_track_update);
 600
 601 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
 602 {
 603         unsigned int regcount;
 604         int i;
 605
 606         __nft_reg_track_clobber(track, dreg);
 607
 608         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 609         for (i = 0; i < regcount; i++, dreg++)
 610                 __nft_reg_track_cancel(track, dreg);
 611 }
 612 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
 613
 614 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
 615 {
 616         track->regs[dreg].selector = NULL;
 617         track->regs[dreg].bitwise = NULL;
 618         track->regs[dreg].num_reg = 0;
 619 }
 620 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
 621
 622 /*
 623  * Tables
 624  */
 625
 626 static struct nft_table *nft_table_lookup(const struct net *net,
 627                                           const struct nlattr *nla,
 628                                           u8 family, u8 genmask, u32 nlpid)
 629 {
 630         struct nftables_pernet *nft_net;
 631         struct nft_table *table;
 632
 633         if (nla == NULL)
 634                 return ERR_PTR(-EINVAL);
 635
 636         nft_net = nft_pernet(net);
 637         list_for_each_entry_rcu(table, &nft_net->tables, list,
 638                                 lockdep_is_held(&nft_net->commit_mutex)) {
 639                 if (!nla_strcmp(nla, table->name) &&
 640                     table->family == family &&
 641                     nft_active_genmask(table, genmask)) {
 642                         if (nft_table_has_owner(table) &&
 643                             nlpid && table->nlpid != nlpid)
 644                                 return ERR_PTR(-EPERM);
 645
 646                         return table;
 647                 }
 648         }
 649
 650         return ERR_PTR(-ENOENT);
 651 }
 652
 653 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 654                                                    const struct nlattr *nla,
 655                                                    u8 genmask, u32 nlpid)
 656 {
 657         struct nftables_pernet *nft_net;
 658         struct nft_table *table;
 659
 660         nft_net = nft_pernet(net);
 661         list_for_each_entry(table, &nft_net->tables, list) {
 662                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 663                     nft_active_genmask(table, genmask)) {
 664                         if (nft_table_has_owner(table) &&
 665                             nlpid && table->nlpid != nlpid)
 666                                 return ERR_PTR(-EPERM);
 667
 668                         return table;
 669                 }
 670         }
 671
 672         return ERR_PTR(-ENOENT);
 673 }
 674
 675 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 676 {
 677         return ++table->hgenerator;
 678 }
 679
 680 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 681
 682 static const struct nft_chain_type *
 683 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 684 {
 685         if (family >= NFPROTO_NUMPROTO ||
 686             type >= NFT_CHAIN_T_MAX)
 687                 return NULL;
 688
 689         return chain_type[family][type];
 690 }
 691
 692 static const struct nft_chain_type *
 693 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 694 {
 695         const struct nft_chain_type *type;
 696         int i;
 697
 698         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 699                 type = __nft_chain_type_get(family, i);
 700                 if (!type)
 701                         continue;
 702                 if (!nla_strcmp(nla, type->name))
 703                         return type;
 704         }
 705         return NULL;
 706 }
 707
 708 struct nft_module_request {
 709         struct list_head        list;
 710         char                    module[MODULE_NAME_LEN];
 711         bool                    done;
 712 };
 713
 714 #ifdef CONFIG_MODULES
 715 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 716                                       ...)
 717 {
 718         char module_name[MODULE_NAME_LEN];
 719         struct nftables_pernet *nft_net;
 720         struct nft_module_request *req;
 721         va_list args;
 722         int ret;
 723
 724         va_start(args, fmt);
 725         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 726         va_end(args);
 727         if (ret >= MODULE_NAME_LEN)
 728                 return 0;
 729
 730         nft_net = nft_pernet(net);
 731         list_for_each_entry(req, &nft_net->module_list, list) {
 732                 if (!strcmp(req->module, module_name)) {
 733                         if (req->done)
 734                                 return 0;
 735
 736                         /* A request to load this module already exists. */
 737                         return -EAGAIN;
 738                 }
 739         }
 740
 741         req = kmalloc(sizeof(*req), GFP_KERNEL);
 742         if (!req)
 743                 return -ENOMEM;
 744
 745         req->done = false;
 746         strlcpy(req->module, module_name, MODULE_NAME_LEN);
 747         list_add_tail(&req->list, &nft_net->module_list);
 748
 749         return -EAGAIN;
 750 }
 751 EXPORT_SYMBOL_GPL(nft_request_module);
 752 #endif
 753
 754 static void lockdep_nfnl_nft_mutex_not_held(void)
 755 {
 756 #ifdef CONFIG_PROVE_LOCKING
 757         if (debug_locks)
 758                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 759 #endif
 760 }
 761
 762 static const struct nft_chain_type *
 763 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 764                             u8 family, bool autoload)
 765 {
 766         const struct nft_chain_type *type;
 767
 768         type = __nf_tables_chain_type_lookup(nla, family);
 769         if (type != NULL)
 770                 return type;
 771
 772         lockdep_nfnl_nft_mutex_not_held();
 773 #ifdef CONFIG_MODULES
 774         if (autoload) {
 775                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 776                                        nla_len(nla),
 777                                        (const char *)nla_data(nla)) == -EAGAIN)
 778                         return ERR_PTR(-EAGAIN);
 779         }
 780 #endif
 781         return ERR_PTR(-ENOENT);
 782 }
 783
 784 static __be16 nft_base_seq(const struct net *net)
 785 {
 786         struct nftables_pernet *nft_net = nft_pernet(net);
 787
 788         return htons(nft_net->base_seq & 0xffff);
 789 }
 790
 791 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 792         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 793                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 794         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 795         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 796         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 797                                     .len = NFT_USERDATA_MAXLEN }
 798 };
 799
 800 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 801                                      u32 portid, u32 seq, int event, u32 flags,
 802                                      int family, const struct nft_table *table)
 803 {
 804         struct nlmsghdr *nlh;
 805
 806         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 807         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 808                            NFNETLINK_V0, nft_base_seq(net));
 809         if (!nlh)
 810                 goto nla_put_failure;
 811
 812         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 813             nla_put_be32(skb, NFTA_TABLE_FLAGS,
 814                          htonl(table->flags & NFT_TABLE_F_MASK)) ||
 815             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 816             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 817                          NFTA_TABLE_PAD))
 818                 goto nla_put_failure;
 819         if (nft_table_has_owner(table) &&
 820             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 821                 goto nla_put_failure;
 822
 823         if (table->udata) {
 824                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 825                         goto nla_put_failure;
 826         }
 827
 828         nlmsg_end(skb, nlh);
 829         return 0;
 830
 831 nla_put_failure:
 832         nlmsg_trim(skb, nlh);
 833         return -1;
 834 }
 835
 836 struct nftnl_skb_parms {
 837         bool report;
 838 };
 839 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 840
 841 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 842                                struct list_head *notify_list)
 843 {
 844         NFT_CB(skb).report = report;
 845         list_add_tail(&skb->list, notify_list);
 846 }
 847
 848 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 849 {
 850         struct nftables_pernet *nft_net;
 851         struct sk_buff *skb;
 852         u16 flags = 0;
 853         int err;
 854
 855         if (!ctx->report &&
 856             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 857                 return;
 858
 859         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 860         if (skb == NULL)
 861                 goto err;
 862
 863         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
 864                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
 865
 866         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 867                                         event, flags, ctx->family, ctx->table);
 868         if (err < 0) {
 869                 kfree_skb(skb);
 870                 goto err;
 871         }
 872
 873         nft_net = nft_pernet(ctx->net);
 874         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
 875         return;
 876 err:
 877         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 878 }
 879
 880 static int nf_tables_dump_tables(struct sk_buff *skb,
 881                                  struct netlink_callback *cb)
 882 {
 883         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 884         struct nftables_pernet *nft_net;
 885         const struct nft_table *table;
 886         unsigned int idx = 0, s_idx = cb->args[0];
 887         struct net *net = sock_net(skb->sk);
 888         int family = nfmsg->nfgen_family;
 889
 890         rcu_read_lock();
 891         nft_net = nft_pernet(net);
 892         cb->seq = nft_net->base_seq;
 893
 894         list_for_each_entry_rcu(table, &nft_net->tables, list) {
 895                 if (family != NFPROTO_UNSPEC && family != table->family)
 896                         continue;
 897
 898                 if (idx < s_idx)
 899                         goto cont;
 900                 if (idx > s_idx)
 901                         memset(&cb->args[1], 0,
 902                                sizeof(cb->args) - sizeof(cb->args[0]));
 903                 if (!nft_is_active(net, table))
 904                         continue;
 905                 if (nf_tables_fill_table_info(skb, net,
 906                                               NETLINK_CB(cb->skb).portid,
 907                                               cb->nlh->nlmsg_seq,
 908                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 909                                               table->family, table) < 0)
 910                         goto done;
 911
 912                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 913 cont:
 914                 idx++;
 915         }
 916 done:
 917         rcu_read_unlock();
 918         cb->args[0] = idx;
 919         return skb->len;
 920 }
 921
 922 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 923                                       const struct nlmsghdr *nlh,
 924                                       struct netlink_dump_control *c)
 925 {
 926         int err;
 927
 928         if (!try_module_get(THIS_MODULE))
 929                 return -EINVAL;
 930
 931         rcu_read_unlock();
 932         err = netlink_dump_start(nlsk, skb, nlh, c);
 933         rcu_read_lock();
 934         module_put(THIS_MODULE);
 935
 936         return err;
 937 }
 938
 939 /* called with rcu_read_lock held */
 940 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
 941                               const struct nlattr * const nla[])
 942 {
 943         struct netlink_ext_ack *extack = info->extack;
 944         u8 genmask = nft_genmask_cur(info->net);
 945         u8 family = info->nfmsg->nfgen_family;
 946         const struct nft_table *table;
 947         struct net *net = info->net;
 948         struct sk_buff *skb2;
 949         int err;
 950
 951         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
 952                 struct netlink_dump_control c = {
 953                         .dump = nf_tables_dump_tables,
 954                         .module = THIS_MODULE,
 955                 };
 956
 957                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
 958         }
 959
 960         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
 961         if (IS_ERR(table)) {
 962                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 963                 return PTR_ERR(table);
 964         }
 965
 966         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 967         if (!skb2)
 968                 return -ENOMEM;
 969
 970         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 971                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
 972                                         0, family, table);
 973         if (err < 0)
 974                 goto err_fill_table_info;
 975
 976         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 977
 978 err_fill_table_info:
 979         kfree_skb(skb2);
 980         return err;
 981 }
 982
 983 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
 984 {
 985         struct nft_chain *chain;
 986         u32 i = 0;
 987
 988         list_for_each_entry(chain, &table->chains, list) {
 989                 if (!nft_is_active_next(net, chain))
 990                         continue;
 991                 if (!nft_is_base_chain(chain))
 992                         continue;
 993
 994                 if (cnt && i++ == cnt)
 995                         break;
 996
 997                 nf_tables_unregister_hook(net, table, chain);
 998         }
 999 }
1000
1001 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1002 {
1003         struct nft_chain *chain;
1004         int err, i = 0;
1005
1006         list_for_each_entry(chain, &table->chains, list) {
1007                 if (!nft_is_active_next(net, chain))
1008                         continue;
1009                 if (!nft_is_base_chain(chain))
1010                         continue;
1011
1012                 err = nf_tables_register_hook(net, table, chain);
1013                 if (err < 0)
1014                         goto err_register_hooks;
1015
1016                 i++;
1017         }
1018         return 0;
1019
1020 err_register_hooks:
1021         if (i)
1022                 nft_table_disable(net, table, i);
1023         return err;
1024 }
1025
1026 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1027 {
1028         table->flags &= ~NFT_TABLE_F_DORMANT;
1029         nft_table_disable(net, table, 0);
1030         table->flags |= NFT_TABLE_F_DORMANT;
1031 }
1032
1033 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
1034 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
1035 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
1036 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
1037                                          __NFT_TABLE_F_WAS_AWAKEN)
1038
1039 static int nf_tables_updtable(struct nft_ctx *ctx)
1040 {
1041         struct nft_trans *trans;
1042         u32 flags;
1043         int ret;
1044
1045         if (!ctx->nla[NFTA_TABLE_FLAGS])
1046                 return 0;
1047
1048         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1049         if (flags & ~NFT_TABLE_F_MASK)
1050                 return -EOPNOTSUPP;
1051
1052         if (flags == ctx->table->flags)
1053                 return 0;
1054
1055         if ((nft_table_has_owner(ctx->table) &&
1056              !(flags & NFT_TABLE_F_OWNER)) ||
1057             (!nft_table_has_owner(ctx->table) &&
1058              flags & NFT_TABLE_F_OWNER))
1059                 return -EOPNOTSUPP;
1060
1061         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1062                                 sizeof(struct nft_trans_table));
1063         if (trans == NULL)
1064                 return -ENOMEM;
1065
1066         if ((flags & NFT_TABLE_F_DORMANT) &&
1067             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1068                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1069                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1070                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1071         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1072                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1073                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1074                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1075                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1076                         if (ret < 0)
1077                                 goto err_register_hooks;
1078
1079                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1080                 }
1081         }
1082
1083         nft_trans_table_update(trans) = true;
1084         nft_trans_commit_list_add_tail(ctx->net, trans);
1085
1086         return 0;
1087
1088 err_register_hooks:
1089         nft_trans_destroy(trans);
1090         return ret;
1091 }
1092
1093 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1094 {
1095         const char *name = data;
1096
1097         return jhash(name, strlen(name), seed);
1098 }
1099
1100 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1101 {
1102         const struct nft_chain *chain = data;
1103
1104         return nft_chain_hash(chain->name, 0, seed);
1105 }
1106
1107 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1108                               const void *ptr)
1109 {
1110         const struct nft_chain *chain = ptr;
1111         const char *name = arg->key;
1112
1113         return strcmp(chain->name, name);
1114 }
1115
1116 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1117 {
1118         const struct nft_object_hash_key *k = data;
1119
1120         seed ^= hash_ptr(k->table, 32);
1121
1122         return jhash(k->name, strlen(k->name), seed);
1123 }
1124
1125 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1126 {
1127         const struct nft_object *obj = data;
1128
1129         return nft_objname_hash(&obj->key, 0, seed);
1130 }
1131
1132 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1133                                 const void *ptr)
1134 {
1135         const struct nft_object_hash_key *k = arg->key;
1136         const struct nft_object *obj = ptr;
1137
1138         if (obj->key.table != k->table)
1139                 return -1;
1140
1141         return strcmp(obj->key.name, k->name);
1142 }
1143
1144 static bool nft_supported_family(u8 family)
1145 {
1146         return false
1147 #ifdef CONFIG_NF_TABLES_INET
1148                 || family == NFPROTO_INET
1149 #endif
1150 #ifdef CONFIG_NF_TABLES_IPV4
1151                 || family == NFPROTO_IPV4
1152 #endif
1153 #ifdef CONFIG_NF_TABLES_ARP
1154                 || family == NFPROTO_ARP
1155 #endif
1156 #ifdef CONFIG_NF_TABLES_NETDEV
1157                 || family == NFPROTO_NETDEV
1158 #endif
1159 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1160                 || family == NFPROTO_BRIDGE
1161 #endif
1162 #ifdef CONFIG_NF_TABLES_IPV6
1163                 || family == NFPROTO_IPV6
1164 #endif
1165                 ;
1166 }
1167
1168 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1169                               const struct nlattr * const nla[])
1170 {
1171         struct nftables_pernet *nft_net = nft_pernet(info->net);
1172         struct netlink_ext_ack *extack = info->extack;
1173         u8 genmask = nft_genmask_next(info->net);
1174         u8 family = info->nfmsg->nfgen_family;
1175         struct net *net = info->net;
1176         const struct nlattr *attr;
1177         struct nft_table *table;
1178         struct nft_ctx ctx;
1179         u32 flags = 0;
1180         int err;
1181
1182         if (!nft_supported_family(family))
1183                 return -EOPNOTSUPP;
1184
1185         lockdep_assert_held(&nft_net->commit_mutex);
1186         attr = nla[NFTA_TABLE_NAME];
1187         table = nft_table_lookup(net, attr, family, genmask,
1188                                  NETLINK_CB(skb).portid);
1189         if (IS_ERR(table)) {
1190                 if (PTR_ERR(table) != -ENOENT)
1191                         return PTR_ERR(table);
1192         } else {
1193                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1194                         NL_SET_BAD_ATTR(extack, attr);
1195                         return -EEXIST;
1196                 }
1197                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1198                         return -EOPNOTSUPP;
1199
1200                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1201
1202                 return nf_tables_updtable(&ctx);
1203         }
1204
1205         if (nla[NFTA_TABLE_FLAGS]) {
1206                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1207                 if (flags & ~NFT_TABLE_F_MASK)
1208                         return -EOPNOTSUPP;
1209         }
1210
1211         err = -ENOMEM;
1212         table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1213         if (table == NULL)
1214                 goto err_kzalloc;
1215
1216         table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1217         if (table->name == NULL)
1218                 goto err_strdup;
1219
1220         if (nla[NFTA_TABLE_USERDATA]) {
1221                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1222                 if (table->udata == NULL)
1223                         goto err_table_udata;
1224
1225                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1226         }
1227
1228         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1229         if (err)
1230                 goto err_chain_ht;
1231
1232         INIT_LIST_HEAD(&table->chains);
1233         INIT_LIST_HEAD(&table->sets);
1234         INIT_LIST_HEAD(&table->objects);
1235         INIT_LIST_HEAD(&table->flowtables);
1236         table->family = family;
1237         table->flags = flags;
1238         table->handle = ++table_handle;
1239         if (table->flags & NFT_TABLE_F_OWNER)
1240                 table->nlpid = NETLINK_CB(skb).portid;
1241
1242         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1243         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1244         if (err < 0)
1245                 goto err_trans;
1246
1247         list_add_tail_rcu(&table->list, &nft_net->tables);
1248         return 0;
1249 err_trans:
1250         rhltable_destroy(&table->chains_ht);
1251 err_chain_ht:
1252         kfree(table->udata);
1253 err_table_udata:
1254         kfree(table->name);
1255 err_strdup:
1256         kfree(table);
1257 err_kzalloc:
1258         return err;
1259 }
1260
1261 static int nft_flush_table(struct nft_ctx *ctx)
1262 {
1263         struct nft_flowtable *flowtable, *nft;
1264         struct nft_chain *chain, *nc;
1265         struct nft_object *obj, *ne;
1266         struct nft_set *set, *ns;
1267         int err;
1268
1269         list_for_each_entry(chain, &ctx->table->chains, list) {
1270                 if (!nft_is_active_next(ctx->net, chain))
1271                         continue;
1272
1273                 if (nft_chain_is_bound(chain))
1274                         continue;
1275
1276                 ctx->chain = chain;
1277
1278                 err = nft_delrule_by_chain(ctx);
1279                 if (err < 0)
1280                         goto out;
1281         }
1282
1283         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1284                 if (!nft_is_active_next(ctx->net, set))
1285                         continue;
1286
1287                 if (nft_set_is_anonymous(set) &&
1288                     !list_empty(&set->bindings))
1289                         continue;
1290
1291                 err = nft_delset(ctx, set);
1292                 if (err < 0)
1293                         goto out;
1294         }
1295
1296         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1297                 if (!nft_is_active_next(ctx->net, flowtable))
1298                         continue;
1299
1300                 err = nft_delflowtable(ctx, flowtable);
1301                 if (err < 0)
1302                         goto out;
1303         }
1304
1305         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1306                 if (!nft_is_active_next(ctx->net, obj))
1307                         continue;
1308
1309                 err = nft_delobj(ctx, obj);
1310                 if (err < 0)
1311                         goto out;
1312         }
1313
1314         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1315                 if (!nft_is_active_next(ctx->net, chain))
1316                         continue;
1317
1318                 if (nft_chain_is_bound(chain))
1319                         continue;
1320
1321                 ctx->chain = chain;
1322
1323                 err = nft_delchain(ctx);
1324                 if (err < 0)
1325                         goto out;
1326         }
1327
1328         err = nft_deltable(ctx);
1329 out:
1330         return err;
1331 }
1332
1333 static int nft_flush(struct nft_ctx *ctx, int family)
1334 {
1335         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1336         const struct nlattr * const *nla = ctx->nla;
1337         struct nft_table *table, *nt;
1338         int err = 0;
1339
1340         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1341                 if (family != AF_UNSPEC && table->family != family)
1342                         continue;
1343
1344                 ctx->family = table->family;
1345
1346                 if (!nft_is_active_next(ctx->net, table))
1347                         continue;
1348
1349                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1350                         continue;
1351
1352                 if (nla[NFTA_TABLE_NAME] &&
1353                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1354                         continue;
1355
1356                 ctx->table = table;
1357
1358                 err = nft_flush_table(ctx);
1359                 if (err < 0)
1360                         goto out;
1361         }
1362 out:
1363         return err;
1364 }
1365
1366 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1367                               const struct nlattr * const nla[])
1368 {
1369         struct netlink_ext_ack *extack = info->extack;
1370         u8 genmask = nft_genmask_next(info->net);
1371         u8 family = info->nfmsg->nfgen_family;
1372         struct net *net = info->net;
1373         const struct nlattr *attr;
1374         struct nft_table *table;
1375         struct nft_ctx ctx;
1376
1377         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1378         if (family == AF_UNSPEC ||
1379             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1380                 return nft_flush(&ctx, family);
1381
1382         if (nla[NFTA_TABLE_HANDLE]) {
1383                 attr = nla[NFTA_TABLE_HANDLE];
1384                 table = nft_table_lookup_byhandle(net, attr, genmask,
1385                                                   NETLINK_CB(skb).portid);
1386         } else {
1387                 attr = nla[NFTA_TABLE_NAME];
1388                 table = nft_table_lookup(net, attr, family, genmask,
1389                                          NETLINK_CB(skb).portid);
1390         }
1391
1392         if (IS_ERR(table)) {
1393                 NL_SET_BAD_ATTR(extack, attr);
1394                 return PTR_ERR(table);
1395         }
1396
1397         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1398             table->use > 0)
1399                 return -EBUSY;
1400
1401         ctx.family = family;
1402         ctx.table = table;
1403
1404         return nft_flush_table(&ctx);
1405 }
1406
1407 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1408 {
1409         if (WARN_ON(ctx->table->use > 0))
1410                 return;
1411
1412         rhltable_destroy(&ctx->table->chains_ht);
1413         kfree(ctx->table->name);
1414         kfree(ctx->table->udata);
1415         kfree(ctx->table);
1416 }
1417
1418 void nft_register_chain_type(const struct nft_chain_type *ctype)
1419 {
1420         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1421         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1422                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1423                 return;
1424         }
1425         chain_type[ctype->family][ctype->type] = ctype;
1426         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1427 }
1428 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1429
1430 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1431 {
1432         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1433         chain_type[ctype->family][ctype->type] = NULL;
1434         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1435 }
1436 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1437
1438 /*
1439  * Chains
1440  */
1441
1442 static struct nft_chain *
1443 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1444 {
1445         struct nft_chain *chain;
1446
1447         list_for_each_entry(chain, &table->chains, list) {
1448                 if (chain->handle == handle &&
1449                     nft_active_genmask(chain, genmask))
1450                         return chain;
1451         }
1452
1453         return ERR_PTR(-ENOENT);
1454 }
1455
1456 static bool lockdep_commit_lock_is_held(const struct net *net)
1457 {
1458 #ifdef CONFIG_PROVE_LOCKING
1459         struct nftables_pernet *nft_net = nft_pernet(net);
1460
1461         return lockdep_is_held(&nft_net->commit_mutex);
1462 #else
1463         return true;
1464 #endif
1465 }
1466
1467 static struct nft_chain *nft_chain_lookup(struct net *net,
1468                                           struct nft_table *table,
1469                                           const struct nlattr *nla, u8 genmask)
1470 {
1471         char search[NFT_CHAIN_MAXNAMELEN + 1];
1472         struct rhlist_head *tmp, *list;
1473         struct nft_chain *chain;
1474
1475         if (nla == NULL)
1476                 return ERR_PTR(-EINVAL);
1477
1478         nla_strscpy(search, nla, sizeof(search));
1479
1480         WARN_ON(!rcu_read_lock_held() &&
1481                 !lockdep_commit_lock_is_held(net));
1482
1483         chain = ERR_PTR(-ENOENT);
1484         rcu_read_lock();
1485         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1486         if (!list)
1487                 goto out_unlock;
1488
1489         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1490                 if (nft_active_genmask(chain, genmask))
1491                         goto out_unlock;
1492         }
1493         chain = ERR_PTR(-ENOENT);
1494 out_unlock:
1495         rcu_read_unlock();
1496         return chain;
1497 }
1498
1499 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1500         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1501                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1502         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1503         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1504                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1505         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1506         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1507         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1508                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1509         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1510         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1511         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1512         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1513                                     .len = NFT_USERDATA_MAXLEN },
1514 };
1515
1516 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1517         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1518         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1519         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1520                                     .len = IFNAMSIZ - 1 },
1521 };
1522
1523 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1524 {
1525         struct nft_stats *cpu_stats, total;
1526         struct nlattr *nest;
1527         unsigned int seq;
1528         u64 pkts, bytes;
1529         int cpu;
1530
1531         if (!stats)
1532                 return 0;
1533
1534         memset(&total, 0, sizeof(total));
1535         for_each_possible_cpu(cpu) {
1536                 cpu_stats = per_cpu_ptr(stats, cpu);
1537                 do {
1538                         seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1539                         pkts = cpu_stats->pkts;
1540                         bytes = cpu_stats->bytes;
1541                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1542                 total.pkts += pkts;
1543                 total.bytes += bytes;
1544         }
1545         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1546         if (nest == NULL)
1547                 goto nla_put_failure;
1548
1549         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1550                          NFTA_COUNTER_PAD) ||
1551             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1552                          NFTA_COUNTER_PAD))
1553                 goto nla_put_failure;
1554
1555         nla_nest_end(skb, nest);
1556         return 0;
1557
1558 nla_put_failure:
1559         return -ENOSPC;
1560 }
1561
1562 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1563                                    const struct nft_base_chain *basechain)
1564 {
1565         const struct nf_hook_ops *ops = &basechain->ops;
1566         struct nft_hook *hook, *first = NULL;
1567         struct nlattr *nest, *nest_devs;
1568         int n = 0;
1569
1570         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1571         if (nest == NULL)
1572                 goto nla_put_failure;
1573         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1574                 goto nla_put_failure;
1575         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1576                 goto nla_put_failure;
1577
1578         if (nft_base_chain_netdev(family, ops->hooknum)) {
1579                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1580                 list_for_each_entry(hook, &basechain->hook_list, list) {
1581                         if (!first)
1582                                 first = hook;
1583
1584                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1585                                            hook->ops.dev->name))
1586                                 goto nla_put_failure;
1587                         n++;
1588                 }
1589                 nla_nest_end(skb, nest_devs);
1590
1591                 if (n == 1 &&
1592                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1593                         goto nla_put_failure;
1594         }
1595         nla_nest_end(skb, nest);
1596
1597         return 0;
1598 nla_put_failure:
1599         return -1;
1600 }
1601
1602 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1603                                      u32 portid, u32 seq, int event, u32 flags,
1604                                      int family, const struct nft_table *table,
1605                                      const struct nft_chain *chain)
1606 {
1607         struct nlmsghdr *nlh;
1608
1609         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1610         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1611                            NFNETLINK_V0, nft_base_seq(net));
1612         if (!nlh)
1613                 goto nla_put_failure;
1614
1615         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1616                 goto nla_put_failure;
1617         if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1618                          NFTA_CHAIN_PAD))
1619                 goto nla_put_failure;
1620         if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1621                 goto nla_put_failure;
1622
1623         if (nft_is_base_chain(chain)) {
1624                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1625                 struct nft_stats __percpu *stats;
1626
1627                 if (nft_dump_basechain_hook(skb, family, basechain))
1628                         goto nla_put_failure;
1629
1630                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1631                                  htonl(basechain->policy)))
1632                         goto nla_put_failure;
1633
1634                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1635                         goto nla_put_failure;
1636
1637                 stats = rcu_dereference_check(basechain->stats,
1638                                               lockdep_commit_lock_is_held(net));
1639                 if (nft_dump_stats(skb, stats))
1640                         goto nla_put_failure;
1641         }
1642
1643         if (chain->flags &&
1644             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1645                 goto nla_put_failure;
1646
1647         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1648                 goto nla_put_failure;
1649
1650         if (chain->udata &&
1651             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1652                 goto nla_put_failure;
1653
1654         nlmsg_end(skb, nlh);
1655         return 0;
1656
1657 nla_put_failure:
1658         nlmsg_trim(skb, nlh);
1659         return -1;
1660 }
1661
1662 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1663 {
1664         struct nftables_pernet *nft_net;
1665         struct sk_buff *skb;
1666         u16 flags = 0;
1667         int err;
1668
1669         if (!ctx->report &&
1670             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1671                 return;
1672
1673         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1674         if (skb == NULL)
1675                 goto err;
1676
1677         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1678                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1679
1680         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1681                                         event, flags, ctx->family, ctx->table,
1682                                         ctx->chain);
1683         if (err < 0) {
1684                 kfree_skb(skb);
1685                 goto err;
1686         }
1687
1688         nft_net = nft_pernet(ctx->net);
1689         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1690         return;
1691 err:
1692         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1693 }
1694
1695 static int nf_tables_dump_chains(struct sk_buff *skb,
1696                                  struct netlink_callback *cb)
1697 {
1698         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1699         unsigned int idx = 0, s_idx = cb->args[0];
1700         struct net *net = sock_net(skb->sk);
1701         int family = nfmsg->nfgen_family;
1702         struct nftables_pernet *nft_net;
1703         const struct nft_table *table;
1704         const struct nft_chain *chain;
1705
1706         rcu_read_lock();
1707         nft_net = nft_pernet(net);
1708         cb->seq = nft_net->base_seq;
1709
1710         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1711                 if (family != NFPROTO_UNSPEC && family != table->family)
1712                         continue;
1713
1714                 list_for_each_entry_rcu(chain, &table->chains, list) {
1715                         if (idx < s_idx)
1716                                 goto cont;
1717                         if (idx > s_idx)
1718                                 memset(&cb->args[1], 0,
1719                                        sizeof(cb->args) - sizeof(cb->args[0]));
1720                         if (!nft_is_active(net, chain))
1721                                 continue;
1722                         if (nf_tables_fill_chain_info(skb, net,
1723                                                       NETLINK_CB(cb->skb).portid,
1724                                                       cb->nlh->nlmsg_seq,
1725                                                       NFT_MSG_NEWCHAIN,
1726                                                       NLM_F_MULTI,
1727                                                       table->family, table,
1728                                                       chain) < 0)
1729                                 goto done;
1730
1731                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1732 cont:
1733                         idx++;
1734                 }
1735         }
1736 done:
1737         rcu_read_unlock();
1738         cb->args[0] = idx;
1739         return skb->len;
1740 }
1741
1742 /* called with rcu_read_lock held */
1743 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1744                               const struct nlattr * const nla[])
1745 {
1746         struct netlink_ext_ack *extack = info->extack;
1747         u8 genmask = nft_genmask_cur(info->net);
1748         u8 family = info->nfmsg->nfgen_family;
1749         const struct nft_chain *chain;
1750         struct net *net = info->net;
1751         struct nft_table *table;
1752         struct sk_buff *skb2;
1753         int err;
1754
1755         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1756                 struct netlink_dump_control c = {
1757                         .dump = nf_tables_dump_chains,
1758                         .module = THIS_MODULE,
1759                 };
1760
1761                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1762         }
1763
1764         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1765         if (IS_ERR(table)) {
1766                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1767                 return PTR_ERR(table);
1768         }
1769
1770         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1771         if (IS_ERR(chain)) {
1772                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1773                 return PTR_ERR(chain);
1774         }
1775
1776         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1777         if (!skb2)
1778                 return -ENOMEM;
1779
1780         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1781                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1782                                         0, family, table, chain);
1783         if (err < 0)
1784                 goto err_fill_chain_info;
1785
1786         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1787
1788 err_fill_chain_info:
1789         kfree_skb(skb2);
1790         return err;
1791 }
1792
1793 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1794         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1795         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1796 };
1797
1798 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1799 {
1800         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1801         struct nft_stats __percpu *newstats;
1802         struct nft_stats *stats;
1803         int err;
1804
1805         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1806                                           nft_counter_policy, NULL);
1807         if (err < 0)
1808                 return ERR_PTR(err);
1809
1810         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1811                 return ERR_PTR(-EINVAL);
1812
1813         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1814         if (newstats == NULL)
1815                 return ERR_PTR(-ENOMEM);
1816
1817         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1818          * are not exposed to userspace.
1819          */
1820         preempt_disable();
1821         stats = this_cpu_ptr(newstats);
1822         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1823         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1824         preempt_enable();
1825
1826         return newstats;
1827 }
1828
1829 static void nft_chain_stats_replace(struct nft_trans *trans)
1830 {
1831         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1832
1833         if (!nft_trans_chain_stats(trans))
1834                 return;
1835
1836         nft_trans_chain_stats(trans) =
1837                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1838                                     lockdep_commit_lock_is_held(trans->ctx.net));
1839
1840         if (!nft_trans_chain_stats(trans))
1841                 static_branch_inc(&nft_counters_enabled);
1842 }
1843
1844 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1845 {
1846         struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
1847         struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
1848
1849         if (g0 != g1)
1850                 kvfree(g1);
1851         kvfree(g0);
1852
1853         /* should be NULL either via abort or via successful commit */
1854         WARN_ON_ONCE(chain->blob_next);
1855         kvfree(chain->blob_next);
1856 }
1857
1858 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1859 {
1860         struct nft_chain *chain = ctx->chain;
1861         struct nft_hook *hook, *next;
1862
1863         if (WARN_ON(chain->use > 0))
1864                 return;
1865
1866         /* no concurrent access possible anymore */
1867         nf_tables_chain_free_chain_rules(chain);
1868
1869         if (nft_is_base_chain(chain)) {
1870                 struct nft_base_chain *basechain = nft_base_chain(chain);
1871
1872                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1873                         list_for_each_entry_safe(hook, next,
1874                                                  &basechain->hook_list, list) {
1875                                 list_del_rcu(&hook->list);
1876                                 kfree_rcu(hook, rcu);
1877                         }
1878                 }
1879                 module_put(basechain->type->owner);
1880                 if (rcu_access_pointer(basechain->stats)) {
1881                         static_branch_dec(&nft_counters_enabled);
1882                         free_percpu(rcu_dereference_raw(basechain->stats));
1883                 }
1884                 kfree(chain->name);
1885                 kfree(chain->udata);
1886                 kfree(basechain);
1887         } else {
1888                 kfree(chain->name);
1889                 kfree(chain->udata);
1890                 kfree(chain);
1891         }
1892 }
1893
1894 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1895                                               const struct nlattr *attr)
1896 {
1897         struct net_device *dev;
1898         char ifname[IFNAMSIZ];
1899         struct nft_hook *hook;
1900         int err;
1901
1902         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
1903         if (!hook) {
1904                 err = -ENOMEM;
1905                 goto err_hook_alloc;
1906         }
1907
1908         nla_strscpy(ifname, attr, IFNAMSIZ);
1909         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1910          * indirectly serializing all the other holders of the commit_mutex with
1911          * the rtnl_mutex.
1912          */
1913         dev = __dev_get_by_name(net, ifname);
1914         if (!dev) {
1915                 err = -ENOENT;
1916                 goto err_hook_dev;
1917         }
1918         hook->ops.dev = dev;
1919
1920         return hook;
1921
1922 err_hook_dev:
1923         kfree(hook);
1924 err_hook_alloc:
1925         return ERR_PTR(err);
1926 }
1927
1928 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1929                                            const struct nft_hook *this)
1930 {
1931         struct nft_hook *hook;
1932
1933         list_for_each_entry(hook, hook_list, list) {
1934                 if (this->ops.dev == hook->ops.dev)
1935                         return hook;
1936         }
1937
1938         return NULL;
1939 }
1940
1941 static int nf_tables_parse_netdev_hooks(struct net *net,
1942                                         const struct nlattr *attr,
1943                                         struct list_head *hook_list)
1944 {
1945         struct nft_hook *hook, *next;
1946         const struct nlattr *tmp;
1947         int rem, n = 0, err;
1948
1949         nla_for_each_nested(tmp, attr, rem) {
1950                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1951                         err = -EINVAL;
1952                         goto err_hook;
1953                 }
1954
1955                 hook = nft_netdev_hook_alloc(net, tmp);
1956                 if (IS_ERR(hook)) {
1957                         err = PTR_ERR(hook);
1958                         goto err_hook;
1959                 }
1960                 if (nft_hook_list_find(hook_list, hook)) {
1961                         kfree(hook);
1962                         err = -EEXIST;
1963                         goto err_hook;
1964                 }
1965                 list_add_tail(&hook->list, hook_list);
1966                 n++;
1967
1968                 if (n == NFT_NETDEVICE_MAX) {
1969                         err = -EFBIG;
1970                         goto err_hook;
1971                 }
1972         }
1973
1974         return 0;
1975
1976 err_hook:
1977         list_for_each_entry_safe(hook, next, hook_list, list) {
1978                 list_del(&hook->list);
1979                 kfree(hook);
1980         }
1981         return err;
1982 }
1983
1984 struct nft_chain_hook {
1985         u32                             num;
1986         s32                             priority;
1987         const struct nft_chain_type     *type;
1988         struct list_head                list;
1989 };
1990
1991 static int nft_chain_parse_netdev(struct net *net,
1992                                   struct nlattr *tb[],
1993                                   struct list_head *hook_list)
1994 {
1995         struct nft_hook *hook;
1996         int err;
1997
1998         if (tb[NFTA_HOOK_DEV]) {
1999                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2000                 if (IS_ERR(hook))
2001                         return PTR_ERR(hook);
2002
2003                 list_add_tail(&hook->list, hook_list);
2004         } else if (tb[NFTA_HOOK_DEVS]) {
2005                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2006                                                    hook_list);
2007                 if (err < 0)
2008                         return err;
2009
2010                 if (list_empty(hook_list))
2011                         return -EINVAL;
2012         } else {
2013                 return -EINVAL;
2014         }
2015
2016         return 0;
2017 }
2018
2019 static int nft_chain_parse_hook(struct net *net,
2020                                 const struct nlattr * const nla[],
2021                                 struct nft_chain_hook *hook, u8 family,
2022                                 struct netlink_ext_ack *extack, bool autoload)
2023 {
2024         struct nftables_pernet *nft_net = nft_pernet(net);
2025         struct nlattr *ha[NFTA_HOOK_MAX + 1];
2026         const struct nft_chain_type *type;
2027         int err;
2028
2029         lockdep_assert_held(&nft_net->commit_mutex);
2030         lockdep_nfnl_nft_mutex_not_held();
2031
2032         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2033                                           nla[NFTA_CHAIN_HOOK],
2034                                           nft_hook_policy, NULL);
2035         if (err < 0)
2036                 return err;
2037
2038         if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
2039             ha[NFTA_HOOK_PRIORITY] == NULL)
2040                 return -EINVAL;
2041
2042         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2043         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2044
2045         type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2046         if (!type)
2047                 return -EOPNOTSUPP;
2048
2049         if (nla[NFTA_CHAIN_TYPE]) {
2050                 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2051                                                    family, autoload);
2052                 if (IS_ERR(type)) {
2053                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2054                         return PTR_ERR(type);
2055                 }
2056         }
2057         if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2058                 return -EOPNOTSUPP;
2059
2060         if (type->type == NFT_CHAIN_T_NAT &&
2061             hook->priority <= NF_IP_PRI_CONNTRACK)
2062                 return -EOPNOTSUPP;
2063
2064         if (!try_module_get(type->owner)) {
2065                 if (nla[NFTA_CHAIN_TYPE])
2066                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2067                 return -ENOENT;
2068         }
2069
2070         hook->type = type;
2071
2072         INIT_LIST_HEAD(&hook->list);
2073         if (nft_base_chain_netdev(family, hook->num)) {
2074                 err = nft_chain_parse_netdev(net, ha, &hook->list);
2075                 if (err < 0) {
2076                         module_put(type->owner);
2077                         return err;
2078                 }
2079         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2080                 module_put(type->owner);
2081                 return -EOPNOTSUPP;
2082         }
2083
2084         return 0;
2085 }
2086
2087 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2088 {
2089         struct nft_hook *h, *next;
2090
2091         list_for_each_entry_safe(h, next, &hook->list, list) {
2092                 list_del(&h->list);
2093                 kfree(h);
2094         }
2095         module_put(hook->type->owner);
2096 }
2097
2098 struct nft_rules_old {
2099         struct rcu_head h;
2100         struct nft_rule_blob *blob;
2101 };
2102
2103 static void nft_last_rule(struct nft_rule_blob *blob, const void *ptr)
2104 {
2105         struct nft_rule_dp *prule;
2106
2107         prule = (struct nft_rule_dp *)ptr;
2108         prule->is_last = 1;
2109         /* blob size does not include the trailer rule */
2110 }
2111
2112 static struct nft_rule_blob *nf_tables_chain_alloc_rules(unsigned int size)
2113 {
2114         struct nft_rule_blob *blob;
2115
2116         /* size must include room for the last rule */
2117         if (size < offsetof(struct nft_rule_dp, data))
2118                 return NULL;
2119
2120         size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rules_old);
2121         if (size > INT_MAX)
2122                 return NULL;
2123
2124         blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2125         if (!blob)
2126                 return NULL;
2127
2128         blob->size = 0;
2129         nft_last_rule(blob, blob->data);
2130
2131         return blob;
2132 }
2133
2134 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2135                                     const struct nft_chain_hook *hook,
2136                                     struct nft_chain *chain)
2137 {
2138         ops->pf                 = family;
2139         ops->hooknum            = hook->num;
2140         ops->priority           = hook->priority;
2141         ops->priv               = chain;
2142         ops->hook               = hook->type->hooks[ops->hooknum];
2143         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2144 }
2145
2146 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2147                               struct nft_chain_hook *hook, u32 flags)
2148 {
2149         struct nft_chain *chain;
2150         struct nft_hook *h;
2151
2152         basechain->type = hook->type;
2153         INIT_LIST_HEAD(&basechain->hook_list);
2154         chain = &basechain->chain;
2155
2156         if (nft_base_chain_netdev(family, hook->num)) {
2157                 list_splice_init(&hook->list, &basechain->hook_list);
2158                 list_for_each_entry(h, &basechain->hook_list, list)
2159                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2160
2161                 basechain->ops.hooknum  = hook->num;
2162                 basechain->ops.priority = hook->priority;
2163         } else {
2164                 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2165         }
2166
2167         chain->flags |= NFT_CHAIN_BASE | flags;
2168         basechain->policy = NF_ACCEPT;
2169         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2170             !nft_chain_offload_support(basechain))
2171                 return -EOPNOTSUPP;
2172
2173         flow_block_init(&basechain->flow_block);
2174
2175         return 0;
2176 }
2177
2178 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2179 {
2180         int err;
2181
2182         err = rhltable_insert_key(&table->chains_ht, chain->name,
2183                                   &chain->rhlhead, nft_chain_ht_params);
2184         if (err)
2185                 return err;
2186
2187         list_add_tail_rcu(&chain->list, &table->chains);
2188
2189         return 0;
2190 }
2191
2192 static u64 chain_id;
2193
2194 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2195                               u8 policy, u32 flags,
2196                               struct netlink_ext_ack *extack)
2197 {
2198         const struct nlattr * const *nla = ctx->nla;
2199         struct nft_table *table = ctx->table;
2200         struct nft_base_chain *basechain;
2201         struct nft_stats __percpu *stats;
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_chain_hook hook;
2215
2216                 if (flags & NFT_CHAIN_BINDING)
2217                         return -EOPNOTSUPP;
2218
2219                 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2220                                            true);
2221                 if (err < 0)
2222                         return err;
2223
2224                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2225                 if (basechain == NULL) {
2226                         nft_chain_release_hook(&hook);
2227                         return -ENOMEM;
2228                 }
2229                 chain = &basechain->chain;
2230
2231                 if (nla[NFTA_CHAIN_COUNTERS]) {
2232                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2233                         if (IS_ERR(stats)) {
2234                                 nft_chain_release_hook(&hook);
2235                                 kfree(basechain);
2236                                 return PTR_ERR(stats);
2237                         }
2238                         rcu_assign_pointer(basechain->stats, stats);
2239                         static_branch_inc(&nft_counters_enabled);
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                         return err;
2247                 }
2248         } else {
2249                 if (flags & NFT_CHAIN_BASE)
2250                         return -EINVAL;
2251                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2252                         return -EOPNOTSUPP;
2253
2254                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2255                 if (chain == NULL)
2256                         return -ENOMEM;
2257
2258                 chain->flags = flags;
2259         }
2260         ctx->chain = chain;
2261
2262         INIT_LIST_HEAD(&chain->rules);
2263         chain->handle = nf_tables_alloc_handle(table);
2264         chain->table = table;
2265
2266         if (nla[NFTA_CHAIN_NAME]) {
2267                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2268         } else {
2269                 if (!(flags & NFT_CHAIN_BINDING)) {
2270                         err = -EINVAL;
2271                         goto err_destroy_chain;
2272                 }
2273
2274                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2275                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2276         }
2277
2278         if (!chain->name) {
2279                 err = -ENOMEM;
2280                 goto err_destroy_chain;
2281         }
2282
2283         if (nla[NFTA_CHAIN_USERDATA]) {
2284                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2285                 if (chain->udata == NULL) {
2286                         err = -ENOMEM;
2287                         goto err_destroy_chain;
2288                 }
2289                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2290         }
2291
2292         data_size = offsetof(struct nft_rule_dp, data); /* last rule */
2293         blob = nf_tables_chain_alloc_rules(data_size);
2294         if (!blob) {
2295                 err = -ENOMEM;
2296                 goto err_destroy_chain;
2297         }
2298
2299         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2300         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2301
2302         err = nf_tables_register_hook(net, table, chain);
2303         if (err < 0)
2304                 goto err_destroy_chain;
2305
2306         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2307         if (IS_ERR(trans)) {
2308                 err = PTR_ERR(trans);
2309                 goto err_unregister_hook;
2310         }
2311
2312         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2313         if (nft_is_base_chain(chain))
2314                 nft_trans_chain_policy(trans) = policy;
2315
2316         err = nft_chain_add(table, chain);
2317         if (err < 0) {
2318                 nft_trans_destroy(trans);
2319                 goto err_unregister_hook;
2320         }
2321
2322         table->use++;
2323
2324         return 0;
2325 err_unregister_hook:
2326         nf_tables_unregister_hook(net, table, chain);
2327 err_destroy_chain:
2328         nf_tables_chain_destroy(ctx);
2329
2330         return err;
2331 }
2332
2333 static bool nft_hook_list_equal(struct list_head *hook_list1,
2334                                 struct list_head *hook_list2)
2335 {
2336         struct nft_hook *hook;
2337         int n = 0, m = 0;
2338
2339         n = 0;
2340         list_for_each_entry(hook, hook_list2, list) {
2341                 if (!nft_hook_list_find(hook_list1, hook))
2342                         return false;
2343
2344                 n++;
2345         }
2346         list_for_each_entry(hook, hook_list1, list)
2347                 m++;
2348
2349         return n == m;
2350 }
2351
2352 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2353                               u32 flags, const struct nlattr *attr,
2354                               struct netlink_ext_ack *extack)
2355 {
2356         const struct nlattr * const *nla = ctx->nla;
2357         struct nft_table *table = ctx->table;
2358         struct nft_chain *chain = ctx->chain;
2359         struct nft_base_chain *basechain;
2360         struct nft_stats *stats = NULL;
2361         struct nft_chain_hook hook;
2362         struct nf_hook_ops *ops;
2363         struct nft_trans *trans;
2364         int err;
2365
2366         if (chain->flags ^ flags)
2367                 return -EOPNOTSUPP;
2368
2369         if (nla[NFTA_CHAIN_HOOK]) {
2370                 if (!nft_is_base_chain(chain)) {
2371                         NL_SET_BAD_ATTR(extack, attr);
2372                         return -EEXIST;
2373                 }
2374                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2375                                            extack, false);
2376                 if (err < 0)
2377                         return err;
2378
2379                 basechain = nft_base_chain(chain);
2380                 if (basechain->type != hook.type) {
2381                         nft_chain_release_hook(&hook);
2382                         NL_SET_BAD_ATTR(extack, attr);
2383                         return -EEXIST;
2384                 }
2385
2386                 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2387                         if (!nft_hook_list_equal(&basechain->hook_list,
2388                                                  &hook.list)) {
2389                                 nft_chain_release_hook(&hook);
2390                                 NL_SET_BAD_ATTR(extack, attr);
2391                                 return -EEXIST;
2392                         }
2393                 } else {
2394                         ops = &basechain->ops;
2395                         if (ops->hooknum != hook.num ||
2396                             ops->priority != hook.priority) {
2397                                 nft_chain_release_hook(&hook);
2398                                 NL_SET_BAD_ATTR(extack, attr);
2399                                 return -EEXIST;
2400                         }
2401                 }
2402                 nft_chain_release_hook(&hook);
2403         }
2404
2405         if (nla[NFTA_CHAIN_HANDLE] &&
2406             nla[NFTA_CHAIN_NAME]) {
2407                 struct nft_chain *chain2;
2408
2409                 chain2 = nft_chain_lookup(ctx->net, table,
2410                                           nla[NFTA_CHAIN_NAME], genmask);
2411                 if (!IS_ERR(chain2)) {
2412                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2413                         return -EEXIST;
2414                 }
2415         }
2416
2417         if (nla[NFTA_CHAIN_COUNTERS]) {
2418                 if (!nft_is_base_chain(chain))
2419                         return -EOPNOTSUPP;
2420
2421                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2422                 if (IS_ERR(stats))
2423                         return PTR_ERR(stats);
2424         }
2425
2426         err = -ENOMEM;
2427         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2428                                 sizeof(struct nft_trans_chain));
2429         if (trans == NULL)
2430                 goto err;
2431
2432         nft_trans_chain_stats(trans) = stats;
2433         nft_trans_chain_update(trans) = true;
2434
2435         if (nla[NFTA_CHAIN_POLICY])
2436                 nft_trans_chain_policy(trans) = policy;
2437         else
2438                 nft_trans_chain_policy(trans) = -1;
2439
2440         if (nla[NFTA_CHAIN_HANDLE] &&
2441             nla[NFTA_CHAIN_NAME]) {
2442                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2443                 struct nft_trans *tmp;
2444                 char *name;
2445
2446                 err = -ENOMEM;
2447                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2448                 if (!name)
2449                         goto err;
2450
2451                 err = -EEXIST;
2452                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2453                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2454                             tmp->ctx.table == table &&
2455                             nft_trans_chain_update(tmp) &&
2456                             nft_trans_chain_name(tmp) &&
2457                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2458                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2459                                 kfree(name);
2460                                 goto err;
2461                         }
2462                 }
2463
2464                 nft_trans_chain_name(trans) = name;
2465         }
2466         nft_trans_commit_list_add_tail(ctx->net, trans);
2467
2468         return 0;
2469 err:
2470         free_percpu(stats);
2471         kfree(trans);
2472         return err;
2473 }
2474
2475 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2476                                                const struct nft_table *table,
2477                                                const struct nlattr *nla)
2478 {
2479         struct nftables_pernet *nft_net = nft_pernet(net);
2480         u32 id = ntohl(nla_get_be32(nla));
2481         struct nft_trans *trans;
2482
2483         list_for_each_entry(trans, &nft_net->commit_list, list) {
2484                 struct nft_chain *chain = trans->ctx.chain;
2485
2486                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2487                     chain->table == table &&
2488                     id == nft_trans_chain_id(trans))
2489                         return chain;
2490         }
2491         return ERR_PTR(-ENOENT);
2492 }
2493
2494 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2495                               const struct nlattr * const nla[])
2496 {
2497         struct nftables_pernet *nft_net = nft_pernet(info->net);
2498         struct netlink_ext_ack *extack = info->extack;
2499         u8 genmask = nft_genmask_next(info->net);
2500         u8 family = info->nfmsg->nfgen_family;
2501         struct nft_chain *chain = NULL;
2502         struct net *net = info->net;
2503         const struct nlattr *attr;
2504         struct nft_table *table;
2505         u8 policy = NF_ACCEPT;
2506         struct nft_ctx ctx;
2507         u64 handle = 0;
2508         u32 flags = 0;
2509
2510         lockdep_assert_held(&nft_net->commit_mutex);
2511
2512         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2513                                  NETLINK_CB(skb).portid);
2514         if (IS_ERR(table)) {
2515                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2516                 return PTR_ERR(table);
2517         }
2518
2519         chain = NULL;
2520         attr = nla[NFTA_CHAIN_NAME];
2521
2522         if (nla[NFTA_CHAIN_HANDLE]) {
2523                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2524                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2525                 if (IS_ERR(chain)) {
2526                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2527                         return PTR_ERR(chain);
2528                 }
2529                 attr = nla[NFTA_CHAIN_HANDLE];
2530         } else if (nla[NFTA_CHAIN_NAME]) {
2531                 chain = nft_chain_lookup(net, table, attr, genmask);
2532                 if (IS_ERR(chain)) {
2533                         if (PTR_ERR(chain) != -ENOENT) {
2534                                 NL_SET_BAD_ATTR(extack, attr);
2535                                 return PTR_ERR(chain);
2536                         }
2537                         chain = NULL;
2538                 }
2539         } else if (!nla[NFTA_CHAIN_ID]) {
2540                 return -EINVAL;
2541         }
2542
2543         if (nla[NFTA_CHAIN_POLICY]) {
2544                 if (chain != NULL &&
2545                     !nft_is_base_chain(chain)) {
2546                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2547                         return -EOPNOTSUPP;
2548                 }
2549
2550                 if (chain == NULL &&
2551                     nla[NFTA_CHAIN_HOOK] == NULL) {
2552                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2553                         return -EOPNOTSUPP;
2554                 }
2555
2556                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2557                 switch (policy) {
2558                 case NF_DROP:
2559                 case NF_ACCEPT:
2560                         break;
2561                 default:
2562                         return -EINVAL;
2563                 }
2564         }
2565
2566         if (nla[NFTA_CHAIN_FLAGS])
2567                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2568         else if (chain)
2569                 flags = chain->flags;
2570
2571         if (flags & ~NFT_CHAIN_FLAGS)
2572                 return -EOPNOTSUPP;
2573
2574         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2575
2576         if (chain != NULL) {
2577                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2578                         NL_SET_BAD_ATTR(extack, attr);
2579                         return -EEXIST;
2580                 }
2581                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2582                         return -EOPNOTSUPP;
2583
2584                 flags |= chain->flags & NFT_CHAIN_BASE;
2585                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2586                                           extack);
2587         }
2588
2589         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2590 }
2591
2592 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2593                               const struct nlattr * const nla[])
2594 {
2595         struct netlink_ext_ack *extack = info->extack;
2596         u8 genmask = nft_genmask_next(info->net);
2597         u8 family = info->nfmsg->nfgen_family;
2598         struct net *net = info->net;
2599         const struct nlattr *attr;
2600         struct nft_table *table;
2601         struct nft_chain *chain;
2602         struct nft_rule *rule;
2603         struct nft_ctx ctx;
2604         u64 handle;
2605         u32 use;
2606         int err;
2607
2608         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2609                                  NETLINK_CB(skb).portid);
2610         if (IS_ERR(table)) {
2611                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2612                 return PTR_ERR(table);
2613         }
2614
2615         if (nla[NFTA_CHAIN_HANDLE]) {
2616                 attr = nla[NFTA_CHAIN_HANDLE];
2617                 handle = be64_to_cpu(nla_get_be64(attr));
2618                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2619         } else {
2620                 attr = nla[NFTA_CHAIN_NAME];
2621                 chain = nft_chain_lookup(net, table, attr, genmask);
2622         }
2623         if (IS_ERR(chain)) {
2624                 NL_SET_BAD_ATTR(extack, attr);
2625                 return PTR_ERR(chain);
2626         }
2627
2628         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2629             chain->use > 0)
2630                 return -EBUSY;
2631
2632         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2633
2634         use = chain->use;
2635         list_for_each_entry(rule, &chain->rules, list) {
2636                 if (!nft_is_active_next(net, rule))
2637                         continue;
2638                 use--;
2639
2640                 err = nft_delrule(&ctx, rule);
2641                 if (err < 0)
2642                         return err;
2643         }
2644
2645         /* There are rules and elements that are still holding references to us,
2646          * we cannot do a recursive removal in this case.
2647          */
2648         if (use > 0) {
2649                 NL_SET_BAD_ATTR(extack, attr);
2650                 return -EBUSY;
2651         }
2652
2653         return nft_delchain(&ctx);
2654 }
2655
2656 /*
2657  * Expressions
2658  */
2659
2660 /**
2661  *      nft_register_expr - register nf_tables expr type
2662  *      @type: expr type
2663  *
2664  *      Registers the expr type for use with nf_tables. Returns zero on
2665  *      success or a negative errno code otherwise.
2666  */
2667 int nft_register_expr(struct nft_expr_type *type)
2668 {
2669         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2670         if (type->family == NFPROTO_UNSPEC)
2671                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2672         else
2673                 list_add_rcu(&type->list, &nf_tables_expressions);
2674         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2675         return 0;
2676 }
2677 EXPORT_SYMBOL_GPL(nft_register_expr);
2678
2679 /**
2680  *      nft_unregister_expr - unregister nf_tables expr type
2681  *      @type: expr type
2682  *
2683  *      Unregisters the expr typefor use with nf_tables.
2684  */
2685 void nft_unregister_expr(struct nft_expr_type *type)
2686 {
2687         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2688         list_del_rcu(&type->list);
2689         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2690 }
2691 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2692
2693 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2694                                                        struct nlattr *nla)
2695 {
2696         const struct nft_expr_type *type, *candidate = NULL;
2697
2698         list_for_each_entry(type, &nf_tables_expressions, list) {
2699                 if (!nla_strcmp(nla, type->name)) {
2700                         if (!type->family && !candidate)
2701                                 candidate = type;
2702                         else if (type->family == family)
2703                                 candidate = type;
2704                 }
2705         }
2706         return candidate;
2707 }
2708
2709 #ifdef CONFIG_MODULES
2710 static int nft_expr_type_request_module(struct net *net, u8 family,
2711                                         struct nlattr *nla)
2712 {
2713         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2714                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2715                 return -EAGAIN;
2716
2717         return 0;
2718 }
2719 #endif
2720
2721 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2722                                                      u8 family,
2723                                                      struct nlattr *nla)
2724 {
2725         const struct nft_expr_type *type;
2726
2727         if (nla == NULL)
2728                 return ERR_PTR(-EINVAL);
2729
2730         type = __nft_expr_type_get(family, nla);
2731         if (type != NULL && try_module_get(type->owner))
2732                 return type;
2733
2734         lockdep_nfnl_nft_mutex_not_held();
2735 #ifdef CONFIG_MODULES
2736         if (type == NULL) {
2737                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2738                         return ERR_PTR(-EAGAIN);
2739
2740                 if (nft_request_module(net, "nft-expr-%.*s",
2741                                        nla_len(nla),
2742                                        (char *)nla_data(nla)) == -EAGAIN)
2743                         return ERR_PTR(-EAGAIN);
2744         }
2745 #endif
2746         return ERR_PTR(-ENOENT);
2747 }
2748
2749 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2750         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2751                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2752         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2753 };
2754
2755 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2756                                     const struct nft_expr *expr)
2757 {
2758         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2759                 goto nla_put_failure;
2760
2761         if (expr->ops->dump) {
2762                 struct nlattr *data = nla_nest_start_noflag(skb,
2763                                                             NFTA_EXPR_DATA);
2764                 if (data == NULL)
2765                         goto nla_put_failure;
2766                 if (expr->ops->dump(skb, expr) < 0)
2767                         goto nla_put_failure;
2768                 nla_nest_end(skb, data);
2769         }
2770
2771         return skb->len;
2772
2773 nla_put_failure:
2774         return -1;
2775 };
2776
2777 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2778                   const struct nft_expr *expr)
2779 {
2780         struct nlattr *nest;
2781
2782         nest = nla_nest_start_noflag(skb, attr);
2783         if (!nest)
2784                 goto nla_put_failure;
2785         if (nf_tables_fill_expr_info(skb, expr) < 0)
2786                 goto nla_put_failure;
2787         nla_nest_end(skb, nest);
2788         return 0;
2789
2790 nla_put_failure:
2791         return -1;
2792 }
2793
2794 struct nft_expr_info {
2795         const struct nft_expr_ops       *ops;
2796         const struct nlattr             *attr;
2797         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2798 };
2799
2800 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2801                                 const struct nlattr *nla,
2802                                 struct nft_expr_info *info)
2803 {
2804         const struct nft_expr_type *type;
2805         const struct nft_expr_ops *ops;
2806         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2807         int err;
2808
2809         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2810                                           nft_expr_policy, NULL);
2811         if (err < 0)
2812                 return err;
2813
2814         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2815         if (IS_ERR(type))
2816                 return PTR_ERR(type);
2817
2818         if (tb[NFTA_EXPR_DATA]) {
2819                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2820                                                   tb[NFTA_EXPR_DATA],
2821                                                   type->policy, NULL);
2822                 if (err < 0)
2823                         goto err1;
2824         } else
2825                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2826
2827         if (type->select_ops != NULL) {
2828                 ops = type->select_ops(ctx,
2829                                        (const struct nlattr * const *)info->tb);
2830                 if (IS_ERR(ops)) {
2831                         err = PTR_ERR(ops);
2832 #ifdef CONFIG_MODULES
2833                         if (err == -EAGAIN)
2834                                 if (nft_expr_type_request_module(ctx->net,
2835                                                                  ctx->family,
2836                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2837                                         err = -ENOENT;
2838 #endif
2839                         goto err1;
2840                 }
2841         } else
2842                 ops = type->ops;
2843
2844         info->attr = nla;
2845         info->ops = ops;
2846
2847         return 0;
2848
2849 err1:
2850         module_put(type->owner);
2851         return err;
2852 }
2853
2854 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2855                              const struct nft_expr_info *expr_info,
2856                              struct nft_expr *expr)
2857 {
2858         const struct nft_expr_ops *ops = expr_info->ops;
2859         int err;
2860
2861         expr->ops = ops;
2862         if (ops->init) {
2863                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2864                 if (err < 0)
2865                         goto err1;
2866         }
2867
2868         return 0;
2869 err1:
2870         expr->ops = NULL;
2871         return err;
2872 }
2873
2874 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2875                                    struct nft_expr *expr)
2876 {
2877         const struct nft_expr_type *type = expr->ops->type;
2878
2879         if (expr->ops->destroy)
2880                 expr->ops->destroy(ctx, expr);
2881         module_put(type->owner);
2882 }
2883
2884 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2885                                       const struct nlattr *nla)
2886 {
2887         struct nft_expr_info expr_info;
2888         struct nft_expr *expr;
2889         struct module *owner;
2890         int err;
2891
2892         err = nf_tables_expr_parse(ctx, nla, &expr_info);
2893         if (err < 0)
2894                 goto err_expr_parse;
2895
2896         err = -EOPNOTSUPP;
2897         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
2898                 goto err_expr_stateful;
2899
2900         err = -ENOMEM;
2901         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
2902         if (expr == NULL)
2903                 goto err_expr_stateful;
2904
2905         err = nf_tables_newexpr(ctx, &expr_info, expr);
2906         if (err < 0)
2907                 goto err_expr_new;
2908
2909         return expr;
2910 err_expr_new:
2911         kfree(expr);
2912 err_expr_stateful:
2913         owner = expr_info.ops->type->owner;
2914         if (expr_info.ops->type->release_ops)
2915                 expr_info.ops->type->release_ops(expr_info.ops);
2916
2917         module_put(owner);
2918 err_expr_parse:
2919         return ERR_PTR(err);
2920 }
2921
2922 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2923 {
2924         int err;
2925
2926         if (src->ops->clone) {
2927                 dst->ops = src->ops;
2928                 err = src->ops->clone(dst, src);
2929                 if (err < 0)
2930                         return err;
2931         } else {
2932                 memcpy(dst, src, src->ops->size);
2933         }
2934
2935         __module_get(src->ops->type->owner);
2936
2937         return 0;
2938 }
2939
2940 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2941 {
2942         nf_tables_expr_destroy(ctx, expr);
2943         kfree(expr);
2944 }
2945
2946 /*
2947  * Rules
2948  */
2949
2950 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2951                                           u64 handle)
2952 {
2953         struct nft_rule *rule;
2954
2955         // FIXME: this sucks
2956         list_for_each_entry_rcu(rule, &chain->rules, list) {
2957                 if (handle == rule->handle)
2958                         return rule;
2959         }
2960
2961         return ERR_PTR(-ENOENT);
2962 }
2963
2964 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2965                                         const struct nlattr *nla)
2966 {
2967         if (nla == NULL)
2968                 return ERR_PTR(-EINVAL);
2969
2970         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2971 }
2972
2973 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2974         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
2975                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
2976         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
2977                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
2978         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
2979         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2980         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
2981         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
2982         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
2983                                     .len = NFT_USERDATA_MAXLEN },
2984         [NFTA_RULE_ID]          = { .type = NLA_U32 },
2985         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2986         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
2987 };
2988
2989 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2990                                     u32 portid, u32 seq, int event,
2991                                     u32 flags, int family,
2992                                     const struct nft_table *table,
2993                                     const struct nft_chain *chain,
2994                                     const struct nft_rule *rule, u64 handle)
2995 {
2996         struct nlmsghdr *nlh;
2997         const struct nft_expr *expr, *next;
2998         struct nlattr *list;
2999         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3000
3001         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3002                            nft_base_seq(net));
3003         if (!nlh)
3004                 goto nla_put_failure;
3005
3006         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3007                 goto nla_put_failure;
3008         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3009                 goto nla_put_failure;
3010         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3011                          NFTA_RULE_PAD))
3012                 goto nla_put_failure;
3013
3014         if (event != NFT_MSG_DELRULE && handle) {
3015                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3016                                  NFTA_RULE_PAD))
3017                         goto nla_put_failure;
3018         }
3019
3020         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3021                 nft_flow_rule_stats(chain, rule);
3022
3023         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3024         if (list == NULL)
3025                 goto nla_put_failure;
3026         nft_rule_for_each_expr(expr, next, rule) {
3027                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
3028                         goto nla_put_failure;
3029         }
3030         nla_nest_end(skb, list);
3031
3032         if (rule->udata) {
3033                 struct nft_userdata *udata = nft_userdata(rule);
3034                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3035                             udata->data) < 0)
3036                         goto nla_put_failure;
3037         }
3038
3039         nlmsg_end(skb, nlh);
3040         return 0;
3041
3042 nla_put_failure:
3043         nlmsg_trim(skb, nlh);
3044         return -1;
3045 }
3046
3047 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3048                                   const struct nft_rule *rule, int event)
3049 {
3050         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3051         const struct nft_rule *prule;
3052         struct sk_buff *skb;
3053         u64 handle = 0;
3054         u16 flags = 0;
3055         int err;
3056
3057         if (!ctx->report &&
3058             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3059                 return;
3060
3061         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3062         if (skb == NULL)
3063                 goto err;
3064
3065         if (event == NFT_MSG_NEWRULE &&
3066             !list_is_first(&rule->list, &ctx->chain->rules) &&
3067             !list_is_last(&rule->list, &ctx->chain->rules)) {
3068                 prule = list_prev_entry(rule, list);
3069                 handle = prule->handle;
3070         }
3071         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3072                 flags |= NLM_F_APPEND;
3073         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3074                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3075
3076         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3077                                        event, flags, ctx->family, ctx->table,
3078                                        ctx->chain, rule, handle);
3079         if (err < 0) {
3080                 kfree_skb(skb);
3081                 goto err;
3082         }
3083
3084         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3085         return;
3086 err:
3087         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3088 }
3089
3090 struct nft_rule_dump_ctx {
3091         char *table;
3092         char *chain;
3093 };
3094
3095 static int __nf_tables_dump_rules(struct sk_buff *skb,
3096                                   unsigned int *idx,
3097                                   struct netlink_callback *cb,
3098                                   const struct nft_table *table,
3099                                   const struct nft_chain *chain)
3100 {
3101         struct net *net = sock_net(skb->sk);
3102         const struct nft_rule *rule, *prule;
3103         unsigned int s_idx = cb->args[0];
3104         u64 handle;
3105
3106         prule = NULL;
3107         list_for_each_entry_rcu(rule, &chain->rules, list) {
3108                 if (!nft_is_active(net, rule))
3109                         goto cont_skip;
3110                 if (*idx < s_idx)
3111                         goto cont;
3112                 if (*idx > s_idx) {
3113                         memset(&cb->args[1], 0,
3114                                         sizeof(cb->args) - sizeof(cb->args[0]));
3115                 }
3116                 if (prule)
3117                         handle = prule->handle;
3118                 else
3119                         handle = 0;
3120
3121                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3122                                         cb->nlh->nlmsg_seq,
3123                                         NFT_MSG_NEWRULE,
3124                                         NLM_F_MULTI | NLM_F_APPEND,
3125                                         table->family,
3126                                         table, chain, rule, handle) < 0)
3127                         return 1;
3128
3129                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3130 cont:
3131                 prule = rule;
3132 cont_skip:
3133                 (*idx)++;
3134         }
3135         return 0;
3136 }
3137
3138 static int nf_tables_dump_rules(struct sk_buff *skb,
3139                                 struct netlink_callback *cb)
3140 {
3141         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3142         const struct nft_rule_dump_ctx *ctx = cb->data;
3143         struct nft_table *table;
3144         const struct nft_chain *chain;
3145         unsigned int idx = 0;
3146         struct net *net = sock_net(skb->sk);
3147         int family = nfmsg->nfgen_family;
3148         struct nftables_pernet *nft_net;
3149
3150         rcu_read_lock();
3151         nft_net = nft_pernet(net);
3152         cb->seq = nft_net->base_seq;
3153
3154         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3155                 if (family != NFPROTO_UNSPEC && family != table->family)
3156                         continue;
3157
3158                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3159                         continue;
3160
3161                 if (ctx && ctx->table && ctx->chain) {
3162                         struct rhlist_head *list, *tmp;
3163
3164                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3165                                                nft_chain_ht_params);
3166                         if (!list)
3167                                 goto done;
3168
3169                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3170                                 if (!nft_is_active(net, chain))
3171                                         continue;
3172                                 __nf_tables_dump_rules(skb, &idx,
3173                                                        cb, table, chain);
3174                                 break;
3175                         }
3176                         goto done;
3177                 }
3178
3179                 list_for_each_entry_rcu(chain, &table->chains, list) {
3180                         if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
3181                                 goto done;
3182                 }
3183
3184                 if (ctx && ctx->table)
3185                         break;
3186         }
3187 done:
3188         rcu_read_unlock();
3189
3190         cb->args[0] = idx;
3191         return skb->len;
3192 }
3193
3194 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3195 {
3196         const struct nlattr * const *nla = cb->data;
3197         struct nft_rule_dump_ctx *ctx = NULL;
3198
3199         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3200                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3201                 if (!ctx)
3202                         return -ENOMEM;
3203
3204                 if (nla[NFTA_RULE_TABLE]) {
3205                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3206                                                         GFP_ATOMIC);
3207                         if (!ctx->table) {
3208                                 kfree(ctx);
3209                                 return -ENOMEM;
3210                         }
3211                 }
3212                 if (nla[NFTA_RULE_CHAIN]) {
3213                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3214                                                 GFP_ATOMIC);
3215                         if (!ctx->chain) {
3216                                 kfree(ctx->table);
3217                                 kfree(ctx);
3218                                 return -ENOMEM;
3219                         }
3220                 }
3221         }
3222
3223         cb->data = ctx;
3224         return 0;
3225 }
3226
3227 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3228 {
3229         struct nft_rule_dump_ctx *ctx = cb->data;
3230
3231         if (ctx) {
3232                 kfree(ctx->table);
3233                 kfree(ctx->chain);
3234                 kfree(ctx);
3235         }
3236         return 0;
3237 }
3238
3239 /* called with rcu_read_lock held */
3240 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3241                              const struct nlattr * const nla[])
3242 {
3243         struct netlink_ext_ack *extack = info->extack;
3244         u8 genmask = nft_genmask_cur(info->net);
3245         u8 family = info->nfmsg->nfgen_family;
3246         const struct nft_chain *chain;
3247         const struct nft_rule *rule;
3248         struct net *net = info->net;
3249         struct nft_table *table;
3250         struct sk_buff *skb2;
3251         int err;
3252
3253         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3254                 struct netlink_dump_control c = {
3255                         .start= nf_tables_dump_rules_start,
3256                         .dump = nf_tables_dump_rules,
3257                         .done = nf_tables_dump_rules_done,
3258                         .module = THIS_MODULE,
3259                         .data = (void *)nla,
3260                 };
3261
3262                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3263         }
3264
3265         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3266         if (IS_ERR(table)) {
3267                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3268                 return PTR_ERR(table);
3269         }
3270
3271         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3272         if (IS_ERR(chain)) {
3273                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3274                 return PTR_ERR(chain);
3275         }
3276
3277         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3278         if (IS_ERR(rule)) {
3279                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3280                 return PTR_ERR(rule);
3281         }
3282
3283         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3284         if (!skb2)
3285                 return -ENOMEM;
3286
3287         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3288                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3289                                        family, table, chain, rule, 0);
3290         if (err < 0)
3291                 goto err_fill_rule_info;
3292
3293         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3294
3295 err_fill_rule_info:
3296         kfree_skb(skb2);
3297         return err;
3298 }
3299
3300 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3301                                    struct nft_rule *rule)
3302 {
3303         struct nft_expr *expr, *next;
3304
3305         /*
3306          * Careful: some expressions might not be initialized in case this
3307          * is called on error from nf_tables_newrule().
3308          */
3309         expr = nft_expr_first(rule);
3310         while (nft_expr_more(rule, expr)) {
3311                 next = nft_expr_next(expr);
3312                 nf_tables_expr_destroy(ctx, expr);
3313                 expr = next;
3314         }
3315         kfree(rule);
3316 }
3317
3318 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3319 {
3320         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3321         nf_tables_rule_destroy(ctx, rule);
3322 }
3323
3324 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3325 {
3326         struct nft_expr *expr, *last;
3327         const struct nft_data *data;
3328         struct nft_rule *rule;
3329         int err;
3330
3331         if (ctx->level == NFT_JUMP_STACK_SIZE)
3332                 return -EMLINK;
3333
3334         list_for_each_entry(rule, &chain->rules, list) {
3335                 if (!nft_is_active_next(ctx->net, rule))
3336                         continue;
3337
3338                 nft_rule_for_each_expr(expr, last, rule) {
3339                         if (!expr->ops->validate)
3340                                 continue;
3341
3342                         err = expr->ops->validate(ctx, expr, &data);
3343                         if (err < 0)
3344                                 return err;
3345                 }
3346
3347                 cond_resched();
3348         }
3349
3350         return 0;
3351 }
3352 EXPORT_SYMBOL_GPL(nft_chain_validate);
3353
3354 static int nft_table_validate(struct net *net, const struct nft_table *table)
3355 {
3356         struct nft_chain *chain;
3357         struct nft_ctx ctx = {
3358                 .net    = net,
3359                 .family = table->family,
3360         };
3361         int err;
3362
3363         list_for_each_entry(chain, &table->chains, list) {
3364                 if (!nft_is_base_chain(chain))
3365                         continue;
3366
3367                 ctx.chain = chain;
3368                 err = nft_chain_validate(&ctx, chain);
3369                 if (err < 0)
3370                         return err;
3371         }
3372
3373         return 0;
3374 }
3375
3376 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3377                                              const struct nft_chain *chain,
3378                                              const struct nlattr *nla);
3379
3380 #define NFT_RULE_MAXEXPRS       128
3381
3382 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3383                              const struct nlattr * const nla[])
3384 {
3385         struct nftables_pernet *nft_net = nft_pernet(info->net);
3386         struct netlink_ext_ack *extack = info->extack;
3387         unsigned int size, i, n, ulen = 0, usize = 0;
3388         u8 genmask = nft_genmask_next(info->net);
3389         struct nft_rule *rule, *old_rule = NULL;
3390         struct nft_expr_info *expr_info = NULL;
3391         u8 family = info->nfmsg->nfgen_family;
3392         struct nft_flow_rule *flow = NULL;
3393         struct net *net = info->net;
3394         struct nft_userdata *udata;
3395         struct nft_table *table;
3396         struct nft_chain *chain;
3397         struct nft_trans *trans;
3398         u64 handle, pos_handle;
3399         struct nft_expr *expr;
3400         struct nft_ctx ctx;
3401         struct nlattr *tmp;
3402         int err, rem;
3403
3404         lockdep_assert_held(&nft_net->commit_mutex);
3405
3406         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3407                                  NETLINK_CB(skb).portid);
3408         if (IS_ERR(table)) {
3409                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3410                 return PTR_ERR(table);
3411         }
3412
3413         if (nla[NFTA_RULE_CHAIN]) {
3414                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3415                                          genmask);
3416                 if (IS_ERR(chain)) {
3417                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3418                         return PTR_ERR(chain);
3419                 }
3420                 if (nft_chain_is_bound(chain))
3421                         return -EOPNOTSUPP;
3422
3423         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3424                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
3425                 if (IS_ERR(chain)) {
3426                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3427                         return PTR_ERR(chain);
3428                 }
3429         } else {
3430                 return -EINVAL;
3431         }
3432
3433         if (nla[NFTA_RULE_HANDLE]) {
3434                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3435                 rule = __nft_rule_lookup(chain, handle);
3436                 if (IS_ERR(rule)) {
3437                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3438                         return PTR_ERR(rule);
3439                 }
3440
3441                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3442                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3443                         return -EEXIST;
3444                 }
3445                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3446                         old_rule = rule;
3447                 else
3448                         return -EOPNOTSUPP;
3449         } else {
3450                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3451                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3452                         return -EINVAL;
3453                 handle = nf_tables_alloc_handle(table);
3454
3455                 if (chain->use == UINT_MAX)
3456                         return -EOVERFLOW;
3457
3458                 if (nla[NFTA_RULE_POSITION]) {
3459                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3460                         old_rule = __nft_rule_lookup(chain, pos_handle);
3461                         if (IS_ERR(old_rule)) {
3462                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3463                                 return PTR_ERR(old_rule);
3464                         }
3465                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3466                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3467                         if (IS_ERR(old_rule)) {
3468                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3469                                 return PTR_ERR(old_rule);
3470                         }
3471                 }
3472         }
3473
3474         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3475
3476         n = 0;
3477         size = 0;
3478         if (nla[NFTA_RULE_EXPRESSIONS]) {
3479                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3480                                            sizeof(struct nft_expr_info),
3481                                            GFP_KERNEL);
3482                 if (!expr_info)
3483                         return -ENOMEM;
3484
3485                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3486                         err = -EINVAL;
3487                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3488                                 goto err_release_expr;
3489                         if (n == NFT_RULE_MAXEXPRS)
3490                                 goto err_release_expr;
3491                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3492                         if (err < 0) {
3493                                 NL_SET_BAD_ATTR(extack, tmp);
3494                                 goto err_release_expr;
3495                         }
3496                         size += expr_info[n].ops->size;
3497                         n++;
3498                 }
3499         }
3500         /* Check for overflow of dlen field */
3501         err = -EFBIG;
3502         if (size >= 1 << 12)
3503                 goto err_release_expr;
3504
3505         if (nla[NFTA_RULE_USERDATA]) {
3506                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3507                 if (ulen > 0)
3508                         usize = sizeof(struct nft_userdata) + ulen;
3509         }
3510
3511         err = -ENOMEM;
3512         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3513         if (rule == NULL)
3514                 goto err_release_expr;
3515
3516         nft_activate_next(net, rule);
3517
3518         rule->handle = handle;
3519         rule->dlen   = size;
3520         rule->udata  = ulen ? 1 : 0;
3521
3522         if (ulen) {
3523                 udata = nft_userdata(rule);
3524                 udata->len = ulen - 1;
3525                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3526         }
3527
3528         expr = nft_expr_first(rule);
3529         for (i = 0; i < n; i++) {
3530                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3531                 if (err < 0) {
3532                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3533                         goto err_release_rule;
3534                 }
3535
3536                 if (expr_info[i].ops->validate)
3537                         nft_validate_state_update(net, NFT_VALIDATE_NEED);
3538
3539                 expr_info[i].ops = NULL;
3540                 expr = nft_expr_next(expr);
3541         }
3542
3543         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3544                 flow = nft_flow_rule_create(net, rule);
3545                 if (IS_ERR(flow)) {
3546                         err = PTR_ERR(flow);
3547                         goto err_release_rule;
3548                 }
3549         }
3550
3551         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3552                 err = nft_delrule(&ctx, old_rule);
3553                 if (err < 0)
3554                         goto err_destroy_flow_rule;
3555
3556                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3557                 if (trans == NULL) {
3558                         err = -ENOMEM;
3559                         goto err_destroy_flow_rule;
3560                 }
3561                 list_add_tail_rcu(&rule->list, &old_rule->list);
3562         } else {
3563                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3564                 if (!trans) {
3565                         err = -ENOMEM;
3566                         goto err_destroy_flow_rule;
3567                 }
3568
3569                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3570                         if (old_rule)
3571                                 list_add_rcu(&rule->list, &old_rule->list);
3572                         else
3573                                 list_add_tail_rcu(&rule->list, &chain->rules);
3574                  } else {
3575                         if (old_rule)
3576                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3577                         else
3578                                 list_add_rcu(&rule->list, &chain->rules);
3579                 }
3580         }
3581         kvfree(expr_info);
3582         chain->use++;
3583
3584         if (flow)
3585                 nft_trans_flow_rule(trans) = flow;
3586
3587         if (nft_net->validate_state == NFT_VALIDATE_DO)
3588                 return nft_table_validate(net, table);
3589
3590         return 0;
3591
3592 err_destroy_flow_rule:
3593         if (flow)
3594                 nft_flow_rule_destroy(flow);
3595 err_release_rule:
3596         nf_tables_rule_release(&ctx, rule);
3597 err_release_expr:
3598         for (i = 0; i < n; i++) {
3599                 if (expr_info[i].ops) {
3600                         module_put(expr_info[i].ops->type->owner);
3601                         if (expr_info[i].ops->type->release_ops)
3602                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3603                 }
3604         }
3605         kvfree(expr_info);
3606
3607         return err;
3608 }
3609
3610 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3611                                              const struct nft_chain *chain,
3612                                              const struct nlattr *nla)
3613 {
3614         struct nftables_pernet *nft_net = nft_pernet(net);
3615         u32 id = ntohl(nla_get_be32(nla));
3616         struct nft_trans *trans;
3617
3618         list_for_each_entry(trans, &nft_net->commit_list, list) {
3619                 struct nft_rule *rule = nft_trans_rule(trans);
3620
3621                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3622                     trans->ctx.chain == chain &&
3623                     id == nft_trans_rule_id(trans))
3624                         return rule;
3625         }
3626         return ERR_PTR(-ENOENT);
3627 }
3628
3629 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3630                              const struct nlattr * const nla[])
3631 {
3632         struct netlink_ext_ack *extack = info->extack;
3633         u8 genmask = nft_genmask_next(info->net);
3634         u8 family = info->nfmsg->nfgen_family;
3635         struct nft_chain *chain = NULL;
3636         struct net *net = info->net;
3637         struct nft_table *table;
3638         struct nft_rule *rule;
3639         struct nft_ctx ctx;
3640         int err = 0;
3641
3642         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3643                                  NETLINK_CB(skb).portid);
3644         if (IS_ERR(table)) {
3645                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3646                 return PTR_ERR(table);
3647         }
3648
3649         if (nla[NFTA_RULE_CHAIN]) {
3650                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3651                                          genmask);
3652                 if (IS_ERR(chain)) {
3653                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3654                         return PTR_ERR(chain);
3655                 }
3656                 if (nft_chain_is_bound(chain))
3657                         return -EOPNOTSUPP;
3658         }
3659
3660         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3661
3662         if (chain) {
3663                 if (nla[NFTA_RULE_HANDLE]) {
3664                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3665                         if (IS_ERR(rule)) {
3666                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3667                                 return PTR_ERR(rule);
3668                         }
3669
3670                         err = nft_delrule(&ctx, rule);
3671                 } else if (nla[NFTA_RULE_ID]) {
3672                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
3673                         if (IS_ERR(rule)) {
3674                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3675                                 return PTR_ERR(rule);
3676                         }
3677
3678                         err = nft_delrule(&ctx, rule);
3679                 } else {
3680                         err = nft_delrule_by_chain(&ctx);
3681                 }
3682         } else {
3683                 list_for_each_entry(chain, &table->chains, list) {
3684                         if (!nft_is_active_next(net, chain))
3685                                 continue;
3686
3687                         ctx.chain = chain;
3688                         err = nft_delrule_by_chain(&ctx);
3689                         if (err < 0)
3690                                 break;
3691                 }
3692         }
3693
3694         return err;
3695 }
3696
3697 /*
3698  * Sets
3699  */
3700 static const struct nft_set_type *nft_set_types[] = {
3701         &nft_set_hash_fast_type,
3702         &nft_set_hash_type,
3703         &nft_set_rhash_type,
3704         &nft_set_bitmap_type,
3705         &nft_set_rbtree_type,
3706 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3707         &nft_set_pipapo_avx2_type,
3708 #endif
3709         &nft_set_pipapo_type,
3710 };
3711
3712 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3713                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3714                                  NFT_SET_EVAL)
3715
3716 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3717 {
3718         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3719 }
3720
3721 /*
3722  * Select a set implementation based on the data characteristics and the
3723  * given policy. The total memory use might not be known if no size is
3724  * given, in that case the amount of memory per element is used.
3725  */
3726 static const struct nft_set_ops *
3727 nft_select_set_ops(const struct nft_ctx *ctx,
3728                    const struct nlattr * const nla[],
3729                    const struct nft_set_desc *desc,
3730                    enum nft_set_policies policy)
3731 {
3732         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3733         const struct nft_set_ops *ops, *bops;
3734         struct nft_set_estimate est, best;
3735         const struct nft_set_type *type;
3736         u32 flags = 0;
3737         int i;
3738
3739         lockdep_assert_held(&nft_net->commit_mutex);
3740         lockdep_nfnl_nft_mutex_not_held();
3741
3742         if (nla[NFTA_SET_FLAGS] != NULL)
3743                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3744
3745         bops        = NULL;
3746         best.size   = ~0;
3747         best.lookup = ~0;
3748         best.space  = ~0;
3749
3750         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3751                 type = nft_set_types[i];
3752                 ops = &type->ops;
3753
3754                 if (!nft_set_ops_candidate(type, flags))
3755                         continue;
3756                 if (!ops->estimate(desc, flags, &est))
3757                         continue;
3758
3759                 switch (policy) {
3760                 case NFT_SET_POL_PERFORMANCE:
3761                         if (est.lookup < best.lookup)
3762                                 break;
3763                         if (est.lookup == best.lookup &&
3764                             est.space < best.space)
3765                                 break;
3766                         continue;
3767                 case NFT_SET_POL_MEMORY:
3768                         if (!desc->size) {
3769                                 if (est.space < best.space)
3770                                         break;
3771                                 if (est.space == best.space &&
3772                                     est.lookup < best.lookup)
3773                                         break;
3774                         } else if (est.size < best.size || !bops) {
3775                                 break;
3776                         }
3777                         continue;
3778                 default:
3779                         break;
3780                 }
3781
3782                 bops = ops;
3783                 best = est;
3784         }
3785
3786         if (bops != NULL)
3787                 return bops;
3788
3789         return ERR_PTR(-EOPNOTSUPP);
3790 }
3791
3792 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3793         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3794                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3795         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3796                                             .len = NFT_SET_MAXNAMELEN - 1 },
3797         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3798         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3799         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3800         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3801         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3802         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3803         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3804         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3805         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3806         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3807         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3808                                             .len  = NFT_USERDATA_MAXLEN },
3809         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3810         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3811         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3812         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
3813 };
3814
3815 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3816         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3817         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3818 };
3819
3820 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3821                                       const struct nlattr *nla, u8 genmask)
3822 {
3823         struct nft_set *set;
3824
3825         if (nla == NULL)
3826                 return ERR_PTR(-EINVAL);
3827
3828         list_for_each_entry_rcu(set, &table->sets, list) {
3829                 if (!nla_strcmp(nla, set->name) &&
3830                     nft_active_genmask(set, genmask))
3831                         return set;
3832         }
3833         return ERR_PTR(-ENOENT);
3834 }
3835
3836 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3837                                                const struct nlattr *nla,
3838                                                u8 genmask)
3839 {
3840         struct nft_set *set;
3841
3842         list_for_each_entry(set, &table->sets, list) {
3843                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3844                     nft_active_genmask(set, genmask))
3845                         return set;
3846         }
3847         return ERR_PTR(-ENOENT);
3848 }
3849
3850 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3851                                            const struct nft_table *table,
3852                                            const struct nlattr *nla, u8 genmask)
3853 {
3854         struct nftables_pernet *nft_net = nft_pernet(net);
3855         u32 id = ntohl(nla_get_be32(nla));
3856         struct nft_trans *trans;
3857
3858         list_for_each_entry(trans, &nft_net->commit_list, list) {
3859                 if (trans->msg_type == NFT_MSG_NEWSET) {
3860                         struct nft_set *set = nft_trans_set(trans);
3861
3862                         if (id == nft_trans_set_id(trans) &&
3863                             set->table == table &&
3864                             nft_active_genmask(set, genmask))
3865                                 return set;
3866                 }
3867         }
3868         return ERR_PTR(-ENOENT);
3869 }
3870
3871 struct nft_set *nft_set_lookup_global(const struct net *net,
3872                                       const struct nft_table *table,
3873                                       const struct nlattr *nla_set_name,
3874                                       const struct nlattr *nla_set_id,
3875                                       u8 genmask)
3876 {
3877         struct nft_set *set;
3878
3879         set = nft_set_lookup(table, nla_set_name, genmask);
3880         if (IS_ERR(set)) {
3881                 if (!nla_set_id)
3882                         return set;
3883
3884                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
3885         }
3886         return set;
3887 }
3888 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3889
3890 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3891                                     const char *name)
3892 {
3893         const struct nft_set *i;
3894         const char *p;
3895         unsigned long *inuse;
3896         unsigned int n = 0, min = 0;
3897
3898         p = strchr(name, '%');
3899         if (p != NULL) {
3900                 if (p[1] != 'd' || strchr(p + 2, '%'))
3901                         return -EINVAL;
3902
3903                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3904                 if (inuse == NULL)
3905                         return -ENOMEM;
3906 cont:
3907                 list_for_each_entry(i, &ctx->table->sets, list) {
3908                         int tmp;
3909
3910                         if (!nft_is_active_next(ctx->net, set))
3911                                 continue;
3912                         if (!sscanf(i->name, name, &tmp))
3913                                 continue;
3914                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3915                                 continue;
3916
3917                         set_bit(tmp - min, inuse);
3918                 }
3919
3920                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3921                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3922                         min += BITS_PER_BYTE * PAGE_SIZE;
3923                         memset(inuse, 0, PAGE_SIZE);
3924                         goto cont;
3925                 }
3926                 free_page((unsigned long)inuse);
3927         }
3928
3929         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
3930         if (!set->name)
3931                 return -ENOMEM;
3932
3933         list_for_each_entry(i, &ctx->table->sets, list) {
3934                 if (!nft_is_active_next(ctx->net, i))
3935                         continue;
3936                 if (!strcmp(set->name, i->name)) {
3937                         kfree(set->name);
3938                         set->name = NULL;
3939                         return -ENFILE;
3940                 }
3941         }
3942         return 0;
3943 }
3944
3945 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3946 {
3947         u64 ms = be64_to_cpu(nla_get_be64(nla));
3948         u64 max = (u64)(~((u64)0));
3949
3950         max = div_u64(max, NSEC_PER_MSEC);
3951         if (ms >= max)
3952                 return -ERANGE;
3953
3954         ms *= NSEC_PER_MSEC;
3955         *result = nsecs_to_jiffies64(ms);
3956         return 0;
3957 }
3958
3959 __be64 nf_jiffies64_to_msecs(u64 input)
3960 {
3961         return cpu_to_be64(jiffies64_to_msecs(input));
3962 }
3963
3964 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3965                                      const struct nft_set *set)
3966 {
3967         struct nlattr *concat, *field;
3968         int i;
3969
3970         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3971         if (!concat)
3972                 return -ENOMEM;
3973
3974         for (i = 0; i < set->field_count; i++) {
3975                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3976                 if (!field)
3977                         return -ENOMEM;
3978
3979                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3980                                  htonl(set->field_len[i])))
3981                         return -ENOMEM;
3982
3983                 nla_nest_end(skb, field);
3984         }
3985
3986         nla_nest_end(skb, concat);
3987
3988         return 0;
3989 }
3990
3991 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3992                               const struct nft_set *set, u16 event, u16 flags)
3993 {
3994         struct nlmsghdr *nlh;
3995         u32 portid = ctx->portid;
3996         struct nlattr *nest;
3997         u32 seq = ctx->seq;
3998         int i;
3999
4000         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4001         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4002                            NFNETLINK_V0, nft_base_seq(ctx->net));
4003         if (!nlh)
4004                 goto nla_put_failure;
4005
4006         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4007                 goto nla_put_failure;
4008         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4009                 goto nla_put_failure;
4010         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4011                          NFTA_SET_PAD))
4012                 goto nla_put_failure;
4013         if (set->flags != 0)
4014                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4015                         goto nla_put_failure;
4016
4017         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4018                 goto nla_put_failure;
4019         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4020                 goto nla_put_failure;
4021         if (set->flags & NFT_SET_MAP) {
4022                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4023                         goto nla_put_failure;
4024                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4025                         goto nla_put_failure;
4026         }
4027         if (set->flags & NFT_SET_OBJECT &&
4028             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4029                 goto nla_put_failure;
4030
4031         if (set->timeout &&
4032             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4033                          nf_jiffies64_to_msecs(set->timeout),
4034                          NFTA_SET_PAD))
4035                 goto nla_put_failure;
4036         if (set->gc_int &&
4037             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
4038                 goto nla_put_failure;
4039
4040         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4041                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4042                         goto nla_put_failure;
4043         }
4044
4045         if (set->udata &&
4046             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4047                 goto nla_put_failure;
4048
4049         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4050         if (!nest)
4051                 goto nla_put_failure;
4052         if (set->size &&
4053             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4054                 goto nla_put_failure;
4055
4056         if (set->field_count > 1 &&
4057             nf_tables_fill_set_concat(skb, set))
4058                 goto nla_put_failure;
4059
4060         nla_nest_end(skb, nest);
4061
4062         if (set->num_exprs == 1) {
4063                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4064                 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
4065                         goto nla_put_failure;
4066
4067                 nla_nest_end(skb, nest);
4068         } else if (set->num_exprs > 1) {
4069                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4070                 if (nest == NULL)
4071                         goto nla_put_failure;
4072
4073                 for (i = 0; i < set->num_exprs; i++) {
4074                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4075                                           set->exprs[i]) < 0)
4076                                 goto nla_put_failure;
4077                 }
4078                 nla_nest_end(skb, nest);
4079         }
4080
4081         nlmsg_end(skb, nlh);
4082         return 0;
4083
4084 nla_put_failure:
4085         nlmsg_trim(skb, nlh);
4086         return -1;
4087 }
4088
4089 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4090                                  const struct nft_set *set, int event,
4091                                  gfp_t gfp_flags)
4092 {
4093         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4094         u32 portid = ctx->portid;
4095         struct sk_buff *skb;
4096         u16 flags = 0;
4097         int err;
4098
4099         if (!ctx->report &&
4100             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4101                 return;
4102
4103         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4104         if (skb == NULL)
4105                 goto err;
4106
4107         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4108                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4109
4110         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4111         if (err < 0) {
4112                 kfree_skb(skb);
4113                 goto err;
4114         }
4115
4116         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4117         return;
4118 err:
4119         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4120 }
4121
4122 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4123 {
4124         const struct nft_set *set;
4125         unsigned int idx, s_idx = cb->args[0];
4126         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4127         struct net *net = sock_net(skb->sk);
4128         struct nft_ctx *ctx = cb->data, ctx_set;
4129         struct nftables_pernet *nft_net;
4130
4131         if (cb->args[1])
4132                 return skb->len;
4133
4134         rcu_read_lock();
4135         nft_net = nft_pernet(net);
4136         cb->seq = nft_net->base_seq;
4137
4138         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4139                 if (ctx->family != NFPROTO_UNSPEC &&
4140                     ctx->family != table->family)
4141                         continue;
4142
4143                 if (ctx->table && ctx->table != table)
4144                         continue;
4145
4146                 if (cur_table) {
4147                         if (cur_table != table)
4148                                 continue;
4149
4150                         cur_table = NULL;
4151                 }
4152                 idx = 0;
4153                 list_for_each_entry_rcu(set, &table->sets, list) {
4154                         if (idx < s_idx)
4155                                 goto cont;
4156                         if (!nft_is_active(net, set))
4157                                 goto cont;
4158
4159                         ctx_set = *ctx;
4160                         ctx_set.table = table;
4161                         ctx_set.family = table->family;
4162
4163                         if (nf_tables_fill_set(skb, &ctx_set, set,
4164                                                NFT_MSG_NEWSET,
4165                                                NLM_F_MULTI) < 0) {
4166                                 cb->args[0] = idx;
4167                                 cb->args[2] = (unsigned long) table;
4168                                 goto done;
4169                         }
4170                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4171 cont:
4172                         idx++;
4173                 }
4174                 if (s_idx)
4175                         s_idx = 0;
4176         }
4177         cb->args[1] = 1;
4178 done:
4179         rcu_read_unlock();
4180         return skb->len;
4181 }
4182
4183 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4184 {
4185         struct nft_ctx *ctx_dump = NULL;
4186
4187         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4188         if (ctx_dump == NULL)
4189                 return -ENOMEM;
4190
4191         cb->data = ctx_dump;
4192         return 0;
4193 }
4194
4195 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4196 {
4197         kfree(cb->data);
4198         return 0;
4199 }
4200
4201 /* called with rcu_read_lock held */
4202 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4203                             const struct nlattr * const nla[])
4204 {
4205         struct netlink_ext_ack *extack = info->extack;
4206         u8 genmask = nft_genmask_cur(info->net);
4207         u8 family = info->nfmsg->nfgen_family;
4208         struct nft_table *table = NULL;
4209         struct net *net = info->net;
4210         const struct nft_set *set;
4211         struct sk_buff *skb2;
4212         struct nft_ctx ctx;
4213         int err;
4214
4215         if (nla[NFTA_SET_TABLE]) {
4216                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4217                                          genmask, 0);
4218                 if (IS_ERR(table)) {
4219                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4220                         return PTR_ERR(table);
4221                 }
4222         }
4223
4224         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4225
4226         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4227                 struct netlink_dump_control c = {
4228                         .start = nf_tables_dump_sets_start,
4229                         .dump = nf_tables_dump_sets,
4230                         .done = nf_tables_dump_sets_done,
4231                         .data = &ctx,
4232                         .module = THIS_MODULE,
4233                 };
4234
4235                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4236         }
4237
4238         /* Only accept unspec with dump */
4239         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4240                 return -EAFNOSUPPORT;
4241         if (!nla[NFTA_SET_TABLE])
4242                 return -EINVAL;
4243
4244         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4245         if (IS_ERR(set))
4246                 return PTR_ERR(set);
4247
4248         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4249         if (skb2 == NULL)
4250                 return -ENOMEM;
4251
4252         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4253         if (err < 0)
4254                 goto err_fill_set_info;
4255
4256         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4257
4258 err_fill_set_info:
4259         kfree_skb(skb2);
4260         return err;
4261 }
4262
4263 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4264         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4265 };
4266
4267 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4268                                      struct nft_set_desc *desc)
4269 {
4270         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4271         u32 len;
4272         int err;
4273
4274         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4275                 return -E2BIG;
4276
4277         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4278                                           nft_concat_policy, NULL);
4279         if (err < 0)
4280                 return err;
4281
4282         if (!tb[NFTA_SET_FIELD_LEN])
4283                 return -EINVAL;
4284
4285         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4286         if (!len || len > U8_MAX)
4287                 return -EINVAL;
4288
4289         desc->field_len[desc->field_count++] = len;
4290
4291         return 0;
4292 }
4293
4294 static int nft_set_desc_concat(struct nft_set_desc *desc,
4295                                const struct nlattr *nla)
4296 {
4297         struct nlattr *attr;
4298         u32 num_regs = 0;
4299         int rem, err, i;
4300
4301         nla_for_each_nested(attr, nla, rem) {
4302                 if (nla_type(attr) != NFTA_LIST_ELEM)
4303                         return -EINVAL;
4304
4305                 err = nft_set_desc_concat_parse(attr, desc);
4306                 if (err < 0)
4307                         return err;
4308         }
4309
4310         for (i = 0; i < desc->field_count; i++)
4311                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4312
4313         if (num_regs > NFT_REG32_COUNT)
4314                 return -E2BIG;
4315
4316         return 0;
4317 }
4318
4319 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4320                                     const struct nlattr *nla)
4321 {
4322         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4323         int err;
4324
4325         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4326                                           nft_set_desc_policy, NULL);
4327         if (err < 0)
4328                 return err;
4329
4330         if (da[NFTA_SET_DESC_SIZE] != NULL)
4331                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4332         if (da[NFTA_SET_DESC_CONCAT])
4333                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4334
4335         return err;
4336 }
4337
4338 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4339                             const struct nlattr * const nla[])
4340 {
4341         u32 ktype, dtype, flags, policy, gc_int, objtype;
4342         struct netlink_ext_ack *extack = info->extack;
4343         u8 genmask = nft_genmask_next(info->net);
4344         u8 family = info->nfmsg->nfgen_family;
4345         const struct nft_set_ops *ops;
4346         struct nft_expr *expr = NULL;
4347         struct net *net = info->net;
4348         struct nft_set_desc desc;
4349         struct nft_table *table;
4350         unsigned char *udata;
4351         struct nft_set *set;
4352         struct nft_ctx ctx;
4353         size_t alloc_size;
4354         u64 timeout;
4355         char *name;
4356         int err, i;
4357         u16 udlen;
4358         u64 size;
4359
4360         if (nla[NFTA_SET_TABLE] == NULL ||
4361             nla[NFTA_SET_NAME] == NULL ||
4362             nla[NFTA_SET_KEY_LEN] == NULL ||
4363             nla[NFTA_SET_ID] == NULL)
4364                 return -EINVAL;
4365
4366         memset(&desc, 0, sizeof(desc));
4367
4368         ktype = NFT_DATA_VALUE;
4369         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4370                 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4371                 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4372                         return -EINVAL;
4373         }
4374
4375         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4376         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4377                 return -EINVAL;
4378
4379         flags = 0;
4380         if (nla[NFTA_SET_FLAGS] != NULL) {
4381                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4382                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4383                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4384                               NFT_SET_MAP | NFT_SET_EVAL |
4385                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4386                         return -EOPNOTSUPP;
4387                 /* Only one of these operations is supported */
4388                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4389                              (NFT_SET_MAP | NFT_SET_OBJECT))
4390                         return -EOPNOTSUPP;
4391                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4392                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4393                         return -EOPNOTSUPP;
4394         }
4395
4396         dtype = 0;
4397         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4398                 if (!(flags & NFT_SET_MAP))
4399                         return -EINVAL;
4400
4401                 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4402                 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4403                     dtype != NFT_DATA_VERDICT)
4404                         return -EINVAL;
4405
4406                 if (dtype != NFT_DATA_VERDICT) {
4407                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4408                                 return -EINVAL;
4409                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4410                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4411                                 return -EINVAL;
4412                 } else
4413                         desc.dlen = sizeof(struct nft_verdict);
4414         } else if (flags & NFT_SET_MAP)
4415                 return -EINVAL;
4416
4417         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4418                 if (!(flags & NFT_SET_OBJECT))
4419                         return -EINVAL;
4420
4421                 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4422                 if (objtype == NFT_OBJECT_UNSPEC ||
4423                     objtype > NFT_OBJECT_MAX)
4424                         return -EOPNOTSUPP;
4425         } else if (flags & NFT_SET_OBJECT)
4426                 return -EINVAL;
4427         else
4428                 objtype = NFT_OBJECT_UNSPEC;
4429
4430         timeout = 0;
4431         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4432                 if (!(flags & NFT_SET_TIMEOUT))
4433                         return -EINVAL;
4434
4435                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4436                 if (err)
4437                         return err;
4438         }
4439         gc_int = 0;
4440         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4441                 if (!(flags & NFT_SET_TIMEOUT))
4442                         return -EINVAL;
4443                 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4444         }
4445
4446         policy = NFT_SET_POL_PERFORMANCE;
4447         if (nla[NFTA_SET_POLICY] != NULL)
4448                 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4449
4450         if (nla[NFTA_SET_DESC] != NULL) {
4451                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4452                 if (err < 0)
4453                         return err;
4454         }
4455
4456         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4457                 desc.expr = true;
4458
4459         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4460                                  NETLINK_CB(skb).portid);
4461         if (IS_ERR(table)) {
4462                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4463                 return PTR_ERR(table);
4464         }
4465
4466         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4467
4468         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4469         if (IS_ERR(set)) {
4470                 if (PTR_ERR(set) != -ENOENT) {
4471                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4472                         return PTR_ERR(set);
4473                 }
4474         } else {
4475                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4476                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4477                         return -EEXIST;
4478                 }
4479                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4480                         return -EOPNOTSUPP;
4481
4482                 return 0;
4483         }
4484
4485         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4486                 return -ENOENT;
4487
4488         ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4489         if (IS_ERR(ops))
4490                 return PTR_ERR(ops);
4491
4492         udlen = 0;
4493         if (nla[NFTA_SET_USERDATA])
4494                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4495
4496         size = 0;
4497         if (ops->privsize != NULL)
4498                 size = ops->privsize(nla, &desc);
4499         alloc_size = sizeof(*set) + size + udlen;
4500         if (alloc_size < size || alloc_size > INT_MAX)
4501                 return -ENOMEM;
4502         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
4503         if (!set)
4504                 return -ENOMEM;
4505
4506         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
4507         if (!name) {
4508                 err = -ENOMEM;
4509                 goto err_set_name;
4510         }
4511
4512         err = nf_tables_set_alloc_name(&ctx, set, name);
4513         kfree(name);
4514         if (err < 0)
4515                 goto err_set_name;
4516
4517         udata = NULL;
4518         if (udlen) {
4519                 udata = set->data + size;
4520                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4521         }
4522
4523         INIT_LIST_HEAD(&set->bindings);
4524         INIT_LIST_HEAD(&set->catchall_list);
4525         set->table = table;
4526         write_pnet(&set->net, net);
4527         set->ops = ops;
4528         set->ktype = ktype;
4529         set->klen = desc.klen;
4530         set->dtype = dtype;
4531         set->objtype = objtype;
4532         set->dlen = desc.dlen;
4533         set->flags = flags;
4534         set->size = desc.size;
4535         set->policy = policy;
4536         set->udlen = udlen;
4537         set->udata = udata;
4538         set->timeout = timeout;
4539         set->gc_int = gc_int;
4540
4541         set->field_count = desc.field_count;
4542         for (i = 0; i < desc.field_count; i++)
4543                 set->field_len[i] = desc.field_len[i];
4544
4545         err = ops->init(set, &desc, nla);
4546         if (err < 0)
4547                 goto err_set_init;
4548
4549         if (nla[NFTA_SET_EXPR]) {
4550                 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4551                 if (IS_ERR(expr)) {
4552                         err = PTR_ERR(expr);
4553                         goto err_set_expr_alloc;
4554                 }
4555                 set->exprs[0] = expr;
4556                 set->num_exprs++;
4557         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4558                 struct nft_expr *expr;
4559                 struct nlattr *tmp;
4560                 int left;
4561
4562                 if (!(flags & NFT_SET_EXPR)) {
4563                         err = -EINVAL;
4564                         goto err_set_expr_alloc;
4565                 }
4566                 i = 0;
4567                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4568                         if (i == NFT_SET_EXPR_MAX) {
4569                                 err = -E2BIG;
4570                                 goto err_set_expr_alloc;
4571                         }
4572                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4573                                 err = -EINVAL;
4574                                 goto err_set_expr_alloc;
4575                         }
4576                         expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
4577                         if (IS_ERR(expr)) {
4578                                 err = PTR_ERR(expr);
4579                                 goto err_set_expr_alloc;
4580                         }
4581                         set->exprs[i++] = expr;
4582                         set->num_exprs++;
4583                 }
4584         }
4585
4586         set->handle = nf_tables_alloc_handle(table);
4587
4588         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4589         if (err < 0)
4590                 goto err_set_expr_alloc;
4591
4592         list_add_tail_rcu(&set->list, &table->sets);
4593         table->use++;
4594         return 0;
4595
4596 err_set_expr_alloc:
4597         for (i = 0; i < set->num_exprs; i++)
4598                 nft_expr_destroy(&ctx, set->exprs[i]);
4599
4600         ops->destroy(set);
4601 err_set_init:
4602         kfree(set->name);
4603 err_set_name:
4604         kvfree(set);
4605         return err;
4606 }
4607
4608 struct nft_set_elem_catchall {
4609         struct list_head        list;
4610         struct rcu_head         rcu;
4611         void                    *elem;
4612 };
4613
4614 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4615                                      struct nft_set *set)
4616 {
4617         struct nft_set_elem_catchall *next, *catchall;
4618
4619         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4620                 list_del_rcu(&catchall->list);
4621                 nft_set_elem_destroy(set, catchall->elem, true);
4622                 kfree_rcu(catchall, rcu);
4623         }
4624 }
4625
4626 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4627 {
4628         int i;
4629
4630         if (WARN_ON(set->use > 0))
4631                 return;
4632
4633         for (i = 0; i < set->num_exprs; i++)
4634                 nft_expr_destroy(ctx, set->exprs[i]);
4635
4636         set->ops->destroy(set);
4637         nft_set_catchall_destroy(ctx, set);
4638         kfree(set->name);
4639         kvfree(set);
4640 }
4641
4642 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4643                             const struct nlattr * const nla[])
4644 {
4645         struct netlink_ext_ack *extack = info->extack;
4646         u8 genmask = nft_genmask_next(info->net);
4647         u8 family = info->nfmsg->nfgen_family;
4648         struct net *net = info->net;
4649         const struct nlattr *attr;
4650         struct nft_table *table;
4651         struct nft_set *set;
4652         struct nft_ctx ctx;
4653
4654         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4655                 return -EAFNOSUPPORT;
4656
4657         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4658                                  genmask, NETLINK_CB(skb).portid);
4659         if (IS_ERR(table)) {
4660                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4661                 return PTR_ERR(table);
4662         }
4663
4664         if (nla[NFTA_SET_HANDLE]) {
4665                 attr = nla[NFTA_SET_HANDLE];
4666                 set = nft_set_lookup_byhandle(table, attr, genmask);
4667         } else {
4668                 attr = nla[NFTA_SET_NAME];
4669                 set = nft_set_lookup(table, attr, genmask);
4670         }
4671
4672         if (IS_ERR(set)) {
4673                 NL_SET_BAD_ATTR(extack, attr);
4674                 return PTR_ERR(set);
4675         }
4676         if (set->use ||
4677             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4678              atomic_read(&set->nelems) > 0)) {
4679                 NL_SET_BAD_ATTR(extack, attr);
4680                 return -EBUSY;
4681         }
4682
4683         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4684
4685         return nft_delset(&ctx, set);
4686 }
4687
4688 static int nft_validate_register_store(const struct nft_ctx *ctx,
4689                                        enum nft_registers reg,
4690                                        const struct nft_data *data,
4691                                        enum nft_data_types type,
4692                                        unsigned int len);
4693
4694 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4695                                      struct nft_set *set,
4696                                      struct nft_set_elem *elem)
4697 {
4698         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4699         enum nft_registers dreg;
4700
4701         dreg = nft_type_to_reg(set->dtype);
4702         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4703                                            set->dtype == NFT_DATA_VERDICT ?
4704                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4705                                            set->dlen);
4706 }
4707
4708 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4709                                         struct nft_set *set,
4710                                         const struct nft_set_iter *iter,
4711                                         struct nft_set_elem *elem)
4712 {
4713         return nft_setelem_data_validate(ctx, set, elem);
4714 }
4715
4716 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4717                                        struct nft_set *set)
4718 {
4719         u8 genmask = nft_genmask_next(ctx->net);
4720         struct nft_set_elem_catchall *catchall;
4721         struct nft_set_elem elem;
4722         struct nft_set_ext *ext;
4723         int ret = 0;
4724
4725         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4726                 ext = nft_set_elem_ext(set, catchall->elem);
4727                 if (!nft_set_elem_active(ext, genmask))
4728                         continue;
4729
4730                 elem.priv = catchall->elem;
4731                 ret = nft_setelem_data_validate(ctx, set, &elem);
4732                 if (ret < 0)
4733                         break;
4734         }
4735
4736         return ret;
4737 }
4738
4739 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4740                        struct nft_set_binding *binding)
4741 {
4742         struct nft_set_binding *i;
4743         struct nft_set_iter iter;
4744
4745         if (set->use == UINT_MAX)
4746                 return -EOVERFLOW;
4747
4748         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4749                 return -EBUSY;
4750
4751         if (binding->flags & NFT_SET_MAP) {
4752                 /* If the set is already bound to the same chain all
4753                  * jumps are already validated for that chain.
4754                  */
4755                 list_for_each_entry(i, &set->bindings, list) {
4756                         if (i->flags & NFT_SET_MAP &&
4757                             i->chain == binding->chain)
4758                                 goto bind;
4759                 }
4760
4761                 iter.genmask    = nft_genmask_next(ctx->net);
4762                 iter.skip       = 0;
4763                 iter.count      = 0;
4764                 iter.err        = 0;
4765                 iter.fn         = nf_tables_bind_check_setelem;
4766
4767                 set->ops->walk(ctx, set, &iter);
4768                 if (!iter.err)
4769                         iter.err = nft_set_catchall_bind_check(ctx, set);
4770
4771                 if (iter.err < 0)
4772                         return iter.err;
4773         }
4774 bind:
4775         binding->chain = ctx->chain;
4776         list_add_tail_rcu(&binding->list, &set->bindings);
4777         nft_set_trans_bind(ctx, set);
4778         set->use++;
4779
4780         return 0;
4781 }
4782 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4783
4784 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4785                                  struct nft_set_binding *binding, bool event)
4786 {
4787         list_del_rcu(&binding->list);
4788
4789         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4790                 list_del_rcu(&set->list);
4791                 if (event)
4792                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4793                                              GFP_KERNEL);
4794         }
4795 }
4796
4797 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4798                               struct nft_set_binding *binding,
4799                               enum nft_trans_phase phase)
4800 {
4801         switch (phase) {
4802         case NFT_TRANS_PREPARE:
4803                 set->use--;
4804                 return;
4805         case NFT_TRANS_ABORT:
4806         case NFT_TRANS_RELEASE:
4807                 set->use--;
4808                 fallthrough;
4809         default:
4810                 nf_tables_unbind_set(ctx, set, binding,
4811                                      phase == NFT_TRANS_COMMIT);
4812         }
4813 }
4814 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4815
4816 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4817 {
4818         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4819                 nft_set_destroy(ctx, set);
4820 }
4821 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4822
4823 const struct nft_set_ext_type nft_set_ext_types[] = {
4824         [NFT_SET_EXT_KEY]               = {
4825                 .align  = __alignof__(u32),
4826         },
4827         [NFT_SET_EXT_DATA]              = {
4828                 .align  = __alignof__(u32),
4829         },
4830         [NFT_SET_EXT_EXPRESSIONS]       = {
4831                 .align  = __alignof__(struct nft_set_elem_expr),
4832         },
4833         [NFT_SET_EXT_OBJREF]            = {
4834                 .len    = sizeof(struct nft_object *),
4835                 .align  = __alignof__(struct nft_object *),
4836         },
4837         [NFT_SET_EXT_FLAGS]             = {
4838                 .len    = sizeof(u8),
4839                 .align  = __alignof__(u8),
4840         },
4841         [NFT_SET_EXT_TIMEOUT]           = {
4842                 .len    = sizeof(u64),
4843                 .align  = __alignof__(u64),
4844         },
4845         [NFT_SET_EXT_EXPIRATION]        = {
4846                 .len    = sizeof(u64),
4847                 .align  = __alignof__(u64),
4848         },
4849         [NFT_SET_EXT_USERDATA]          = {
4850                 .len    = sizeof(struct nft_userdata),
4851                 .align  = __alignof__(struct nft_userdata),
4852         },
4853         [NFT_SET_EXT_KEY_END]           = {
4854                 .align  = __alignof__(u32),
4855         },
4856 };
4857
4858 /*
4859  * Set elements
4860  */
4861
4862 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4863         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
4864         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
4865         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
4866         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
4867         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
4868         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
4869                                             .len = NFT_USERDATA_MAXLEN },
4870         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
4871         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
4872                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
4873         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
4874         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
4875 };
4876
4877 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4878         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
4879                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4880         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
4881                                             .len = NFT_SET_MAXNAMELEN - 1 },
4882         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
4883         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
4884 };
4885
4886 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4887                                   const struct nft_set *set,
4888                                   const struct nft_set_ext *ext)
4889 {
4890         struct nft_set_elem_expr *elem_expr;
4891         u32 size, num_exprs = 0;
4892         struct nft_expr *expr;
4893         struct nlattr *nest;
4894
4895         elem_expr = nft_set_ext_expr(ext);
4896         nft_setelem_expr_foreach(expr, elem_expr, size)
4897                 num_exprs++;
4898
4899         if (num_exprs == 1) {
4900                 expr = nft_setelem_expr_at(elem_expr, 0);
4901                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4902                         return -1;
4903
4904                 return 0;
4905         } else if (num_exprs > 1) {
4906                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4907                 if (nest == NULL)
4908                         goto nla_put_failure;
4909
4910                 nft_setelem_expr_foreach(expr, elem_expr, size) {
4911                         expr = nft_setelem_expr_at(elem_expr, size);
4912                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4913                                 goto nla_put_failure;
4914                 }
4915                 nla_nest_end(skb, nest);
4916         }
4917         return 0;
4918
4919 nla_put_failure:
4920         return -1;
4921 }
4922
4923 static int nf_tables_fill_setelem(struct sk_buff *skb,
4924                                   const struct nft_set *set,
4925                                   const struct nft_set_elem *elem)
4926 {
4927         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4928         unsigned char *b = skb_tail_pointer(skb);
4929         struct nlattr *nest;
4930
4931         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4932         if (nest == NULL)
4933                 goto nla_put_failure;
4934
4935         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
4936             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4937                           NFT_DATA_VALUE, set->klen) < 0)
4938                 goto nla_put_failure;
4939
4940         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4941             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4942                           NFT_DATA_VALUE, set->klen) < 0)
4943                 goto nla_put_failure;
4944
4945         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4946             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4947                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4948                           set->dlen) < 0)
4949                 goto nla_put_failure;
4950
4951         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4952             nft_set_elem_expr_dump(skb, set, ext))
4953                 goto nla_put_failure;
4954
4955         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4956             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4957                            (*nft_set_ext_obj(ext))->key.name) < 0)
4958                 goto nla_put_failure;
4959
4960         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4961             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4962                          htonl(*nft_set_ext_flags(ext))))
4963                 goto nla_put_failure;
4964
4965         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4966             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4967                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4968                          NFTA_SET_ELEM_PAD))
4969                 goto nla_put_failure;
4970
4971         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4972                 u64 expires, now = get_jiffies_64();
4973
4974                 expires = *nft_set_ext_expiration(ext);
4975                 if (time_before64(now, expires))
4976                         expires -= now;
4977                 else
4978                         expires = 0;
4979
4980                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4981                                  nf_jiffies64_to_msecs(expires),
4982                                  NFTA_SET_ELEM_PAD))
4983                         goto nla_put_failure;
4984         }
4985
4986         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4987                 struct nft_userdata *udata;
4988
4989                 udata = nft_set_ext_userdata(ext);
4990                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4991                             udata->len + 1, udata->data))
4992                         goto nla_put_failure;
4993         }
4994
4995         nla_nest_end(skb, nest);
4996         return 0;
4997
4998 nla_put_failure:
4999         nlmsg_trim(skb, b);
5000         return -EMSGSIZE;
5001 }
5002
5003 struct nft_set_dump_args {
5004         const struct netlink_callback   *cb;
5005         struct nft_set_iter             iter;
5006         struct sk_buff                  *skb;
5007 };
5008
5009 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5010                                   struct nft_set *set,
5011                                   const struct nft_set_iter *iter,
5012                                   struct nft_set_elem *elem)
5013 {
5014         struct nft_set_dump_args *args;
5015
5016         args = container_of(iter, struct nft_set_dump_args, iter);
5017         return nf_tables_fill_setelem(args->skb, set, elem);
5018 }
5019
5020 struct nft_set_dump_ctx {
5021         const struct nft_set    *set;
5022         struct nft_ctx          ctx;
5023 };
5024
5025 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5026                                  const struct nft_set *set)
5027 {
5028         struct nft_set_elem_catchall *catchall;
5029         u8 genmask = nft_genmask_cur(net);
5030         struct nft_set_elem elem;
5031         struct nft_set_ext *ext;
5032         int ret = 0;
5033
5034         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5035                 ext = nft_set_elem_ext(set, catchall->elem);
5036                 if (!nft_set_elem_active(ext, genmask) ||
5037                     nft_set_elem_expired(ext))
5038                         continue;
5039
5040                 elem.priv = catchall->elem;
5041                 ret = nf_tables_fill_setelem(skb, set, &elem);
5042                 break;
5043         }
5044
5045         return ret;
5046 }
5047
5048 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5049 {
5050         struct nft_set_dump_ctx *dump_ctx = cb->data;
5051         struct net *net = sock_net(skb->sk);
5052         struct nftables_pernet *nft_net;
5053         struct nft_table *table;
5054         struct nft_set *set;
5055         struct nft_set_dump_args args;
5056         bool set_found = false;
5057         struct nlmsghdr *nlh;
5058         struct nlattr *nest;
5059         u32 portid, seq;
5060         int event;
5061
5062         rcu_read_lock();
5063         nft_net = nft_pernet(net);
5064         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5065                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5066                     dump_ctx->ctx.family != table->family)
5067                         continue;
5068
5069                 if (table != dump_ctx->ctx.table)
5070                         continue;
5071
5072                 list_for_each_entry_rcu(set, &table->sets, list) {
5073                         if (set == dump_ctx->set) {
5074                                 set_found = true;
5075                                 break;
5076                         }
5077                 }
5078                 break;
5079         }
5080
5081         if (!set_found) {
5082                 rcu_read_unlock();
5083                 return -ENOENT;
5084         }
5085
5086         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5087         portid = NETLINK_CB(cb->skb).portid;
5088         seq    = cb->nlh->nlmsg_seq;
5089
5090         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5091                            table->family, NFNETLINK_V0, nft_base_seq(net));
5092         if (!nlh)
5093                 goto nla_put_failure;
5094
5095         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5096                 goto nla_put_failure;
5097         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5098                 goto nla_put_failure;
5099
5100         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5101         if (nest == NULL)
5102                 goto nla_put_failure;
5103
5104         args.cb                 = cb;
5105         args.skb                = skb;
5106         args.iter.genmask       = nft_genmask_cur(net);
5107         args.iter.skip          = cb->args[0];
5108         args.iter.count         = 0;
5109         args.iter.err           = 0;
5110         args.iter.fn            = nf_tables_dump_setelem;
5111         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5112
5113         if (!args.iter.err && args.iter.count == cb->args[0])
5114                 args.iter.err = nft_set_catchall_dump(net, skb, set);
5115         rcu_read_unlock();
5116
5117         nla_nest_end(skb, nest);
5118         nlmsg_end(skb, nlh);
5119
5120         if (args.iter.err && args.iter.err != -EMSGSIZE)
5121                 return args.iter.err;
5122         if (args.iter.count == cb->args[0])
5123                 return 0;
5124
5125         cb->args[0] = args.iter.count;
5126         return skb->len;
5127
5128 nla_put_failure:
5129         rcu_read_unlock();
5130         return -ENOSPC;
5131 }
5132
5133 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5134 {
5135         struct nft_set_dump_ctx *dump_ctx = cb->data;
5136
5137         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5138
5139         return cb->data ? 0 : -ENOMEM;
5140 }
5141
5142 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5143 {
5144         kfree(cb->data);
5145         return 0;
5146 }
5147
5148 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5149                                        const struct nft_ctx *ctx, u32 seq,
5150                                        u32 portid, int event, u16 flags,
5151                                        const struct nft_set *set,
5152                                        const struct nft_set_elem *elem)
5153 {
5154         struct nlmsghdr *nlh;
5155         struct nlattr *nest;
5156         int err;
5157
5158         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5159         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5160                            NFNETLINK_V0, nft_base_seq(ctx->net));
5161         if (!nlh)
5162                 goto nla_put_failure;
5163
5164         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5165                 goto nla_put_failure;
5166         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5167                 goto nla_put_failure;
5168
5169         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5170         if (nest == NULL)
5171                 goto nla_put_failure;
5172
5173         err = nf_tables_fill_setelem(skb, set, elem);
5174         if (err < 0)
5175                 goto nla_put_failure;
5176
5177         nla_nest_end(skb, nest);
5178
5179         nlmsg_end(skb, nlh);
5180         return 0;
5181
5182 nla_put_failure:
5183         nlmsg_trim(skb, nlh);
5184         return -1;
5185 }
5186
5187 static int nft_setelem_parse_flags(const struct nft_set *set,
5188                                    const struct nlattr *attr, u32 *flags)
5189 {
5190         if (attr == NULL)
5191                 return 0;
5192
5193         *flags = ntohl(nla_get_be32(attr));
5194         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5195                 return -EOPNOTSUPP;
5196         if (!(set->flags & NFT_SET_INTERVAL) &&
5197             *flags & NFT_SET_ELEM_INTERVAL_END)
5198                 return -EINVAL;
5199
5200         return 0;
5201 }
5202
5203 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5204                                  struct nft_data *key, struct nlattr *attr)
5205 {
5206         struct nft_data_desc desc = {
5207                 .type   = NFT_DATA_VALUE,
5208                 .size   = NFT_DATA_VALUE_MAXLEN,
5209                 .len    = set->klen,
5210         };
5211
5212         return nft_data_init(ctx, key, &desc, attr);
5213 }
5214
5215 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5216                                   struct nft_data_desc *desc,
5217                                   struct nft_data *data,
5218                                   struct nlattr *attr)
5219 {
5220         u32 dtype;
5221
5222         if (set->dtype == NFT_DATA_VERDICT)
5223                 dtype = NFT_DATA_VERDICT;
5224         else
5225                 dtype = NFT_DATA_VALUE;
5226
5227         desc->type = dtype;
5228         desc->size = NFT_DATA_VALUE_MAXLEN;
5229         desc->len = set->dlen;
5230         desc->flags = NFT_DATA_DESC_SETELEM;
5231
5232         return nft_data_init(ctx, data, desc, attr);
5233 }
5234
5235 static void *nft_setelem_catchall_get(const struct net *net,
5236                                       const struct nft_set *set)
5237 {
5238         struct nft_set_elem_catchall *catchall;
5239         u8 genmask = nft_genmask_cur(net);
5240         struct nft_set_ext *ext;
5241         void *priv = NULL;
5242
5243         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5244                 ext = nft_set_elem_ext(set, catchall->elem);
5245                 if (!nft_set_elem_active(ext, genmask) ||
5246                     nft_set_elem_expired(ext))
5247                         continue;
5248
5249                 priv = catchall->elem;
5250                 break;
5251         }
5252
5253         return priv;
5254 }
5255
5256 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5257                            struct nft_set_elem *elem, u32 flags)
5258 {
5259         void *priv;
5260
5261         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5262                 priv = set->ops->get(ctx->net, set, elem, flags);
5263                 if (IS_ERR(priv))
5264                         return PTR_ERR(priv);
5265         } else {
5266                 priv = nft_setelem_catchall_get(ctx->net, set);
5267                 if (!priv)
5268                         return -ENOENT;
5269         }
5270         elem->priv = priv;
5271
5272         return 0;
5273 }
5274
5275 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5276                             const struct nlattr *attr)
5277 {
5278         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5279         struct nft_set_elem elem;
5280         struct sk_buff *skb;
5281         uint32_t flags = 0;
5282         int err;
5283
5284         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5285                                           nft_set_elem_policy, NULL);
5286         if (err < 0)
5287                 return err;
5288
5289         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5290         if (err < 0)
5291                 return err;
5292
5293         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5294                 return -EINVAL;
5295
5296         if (nla[NFTA_SET_ELEM_KEY]) {
5297                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5298                                             nla[NFTA_SET_ELEM_KEY]);
5299                 if (err < 0)
5300                         return err;
5301         }
5302
5303         if (nla[NFTA_SET_ELEM_KEY_END]) {
5304                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5305                                             nla[NFTA_SET_ELEM_KEY_END]);
5306                 if (err < 0)
5307                         return err;
5308         }
5309
5310         err = nft_setelem_get(ctx, set, &elem, flags);
5311         if (err < 0)
5312                 return err;
5313
5314         err = -ENOMEM;
5315         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5316         if (skb == NULL)
5317                 return err;
5318
5319         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5320                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
5321         if (err < 0)
5322                 goto err_fill_setelem;
5323
5324         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5325
5326 err_fill_setelem:
5327         kfree_skb(skb);
5328         return err;
5329 }
5330
5331 /* called with rcu_read_lock held */
5332 static int nf_tables_getsetelem(struct sk_buff *skb,
5333                                 const struct nfnl_info *info,
5334                                 const struct nlattr * const nla[])
5335 {
5336         struct netlink_ext_ack *extack = info->extack;
5337         u8 genmask = nft_genmask_cur(info->net);
5338         u8 family = info->nfmsg->nfgen_family;
5339         struct net *net = info->net;
5340         struct nft_table *table;
5341         struct nft_set *set;
5342         struct nlattr *attr;
5343         struct nft_ctx ctx;
5344         int rem, err = 0;
5345
5346         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5347                                  genmask, NETLINK_CB(skb).portid);
5348         if (IS_ERR(table)) {
5349                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5350                 return PTR_ERR(table);
5351         }
5352
5353         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5354         if (IS_ERR(set))
5355                 return PTR_ERR(set);
5356
5357         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5358
5359         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5360                 struct netlink_dump_control c = {
5361                         .start = nf_tables_dump_set_start,
5362                         .dump = nf_tables_dump_set,
5363                         .done = nf_tables_dump_set_done,
5364                         .module = THIS_MODULE,
5365                 };
5366                 struct nft_set_dump_ctx dump_ctx = {
5367                         .set = set,
5368                         .ctx = ctx,
5369                 };
5370
5371                 c.data = &dump_ctx;
5372                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5373         }
5374
5375         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5376                 return -EINVAL;
5377
5378         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5379                 err = nft_get_set_elem(&ctx, set, attr);
5380                 if (err < 0) {
5381                         NL_SET_BAD_ATTR(extack, attr);
5382                         break;
5383                 }
5384         }
5385
5386         return err;
5387 }
5388
5389 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5390                                      const struct nft_set *set,
5391                                      const struct nft_set_elem *elem,
5392                                      int event)
5393 {
5394         struct nftables_pernet *nft_net;
5395         struct net *net = ctx->net;
5396         u32 portid = ctx->portid;
5397         struct sk_buff *skb;
5398         u16 flags = 0;
5399         int err;
5400
5401         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5402                 return;
5403
5404         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5405         if (skb == NULL)
5406                 goto err;
5407
5408         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5409                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5410
5411         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5412                                           set, elem);
5413         if (err < 0) {
5414                 kfree_skb(skb);
5415                 goto err;
5416         }
5417
5418         nft_net = nft_pernet(net);
5419         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5420         return;
5421 err:
5422         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5423 }
5424
5425 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5426                                               int msg_type,
5427                                               struct nft_set *set)
5428 {
5429         struct nft_trans *trans;
5430
5431         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5432         if (trans == NULL)
5433                 return NULL;
5434
5435         nft_trans_elem_set(trans) = set;
5436         return trans;
5437 }
5438
5439 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5440                                          const struct nft_set *set,
5441                                          const struct nlattr *attr)
5442 {
5443         struct nft_expr *expr;
5444         int err;
5445
5446         expr = nft_expr_init(ctx, attr);
5447         if (IS_ERR(expr))
5448                 return expr;
5449
5450         err = -EOPNOTSUPP;
5451         if (expr->ops->type->flags & NFT_EXPR_GC) {
5452                 if (set->flags & NFT_SET_TIMEOUT)
5453                         goto err_set_elem_expr;
5454                 if (!set->ops->gc_init)
5455                         goto err_set_elem_expr;
5456                 set->ops->gc_init(set);
5457         }
5458
5459         return expr;
5460
5461 err_set_elem_expr:
5462         nft_expr_destroy(ctx, expr);
5463         return ERR_PTR(err);
5464 }
5465
5466 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
5467 {
5468         len += nft_set_ext_types[id].len;
5469         if (len > tmpl->ext_len[id] ||
5470             len > U8_MAX)
5471                 return -1;
5472
5473         return 0;
5474 }
5475
5476 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
5477                               void *to, const void *from, u32 len)
5478 {
5479         if (nft_set_ext_check(tmpl, id, len) < 0)
5480                 return -1;
5481
5482         memcpy(to, from, len);
5483
5484         return 0;
5485 }
5486
5487 void *nft_set_elem_init(const struct nft_set *set,
5488                         const struct nft_set_ext_tmpl *tmpl,
5489                         const u32 *key, const u32 *key_end,
5490                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5491 {
5492         struct nft_set_ext *ext;
5493         void *elem;
5494
5495         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5496         if (elem == NULL)
5497                 return ERR_PTR(-ENOMEM);
5498
5499         ext = nft_set_elem_ext(set, elem);
5500         nft_set_ext_init(ext, tmpl);
5501
5502         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5503             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
5504                                nft_set_ext_key(ext), key, set->klen) < 0)
5505                 goto err_ext_check;
5506
5507         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5508             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
5509                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
5510                 goto err_ext_check;
5511
5512         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5513             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
5514                                nft_set_ext_data(ext), data, set->dlen) < 0)
5515                 goto err_ext_check;
5516
5517         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5518                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5519                 if (expiration == 0)
5520                         *nft_set_ext_expiration(ext) += timeout;
5521         }
5522         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5523                 *nft_set_ext_timeout(ext) = timeout;
5524
5525         return elem;
5526
5527 err_ext_check:
5528         kfree(elem);
5529
5530         return ERR_PTR(-EINVAL);
5531 }
5532
5533 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5534                                         struct nft_expr *expr)
5535 {
5536         if (expr->ops->destroy_clone) {
5537                 expr->ops->destroy_clone(ctx, expr);
5538                 module_put(expr->ops->type->owner);
5539         } else {
5540                 nf_tables_expr_destroy(ctx, expr);
5541         }
5542 }
5543
5544 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5545                                       struct nft_set_elem_expr *elem_expr)
5546 {
5547         struct nft_expr *expr;
5548         u32 size;
5549
5550         nft_setelem_expr_foreach(expr, elem_expr, size)
5551                 __nft_set_elem_expr_destroy(ctx, expr);
5552 }
5553
5554 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5555                           bool destroy_expr)
5556 {
5557         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5558         struct nft_ctx ctx = {
5559                 .net    = read_pnet(&set->net),
5560                 .family = set->table->family,
5561         };
5562
5563         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5564         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5565                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5566         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5567                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5568
5569         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5570                 (*nft_set_ext_obj(ext))->use--;
5571         kfree(elem);
5572 }
5573 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5574
5575 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5576  * with the refcounting from the preparation phase.
5577  */
5578 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5579                                        const struct nft_set *set, void *elem)
5580 {
5581         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5582
5583         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5584                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5585
5586         kfree(elem);
5587 }
5588
5589 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5590                             struct nft_expr *expr_array[])
5591 {
5592         struct nft_expr *expr;
5593         int err, i, k;
5594
5595         for (i = 0; i < set->num_exprs; i++) {
5596                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
5597                 if (!expr)
5598                         goto err_expr;
5599
5600                 err = nft_expr_clone(expr, set->exprs[i]);
5601                 if (err < 0) {
5602                         nft_expr_destroy(ctx, expr);
5603                         goto err_expr;
5604                 }
5605                 expr_array[i] = expr;
5606         }
5607
5608         return 0;
5609
5610 err_expr:
5611         for (k = i - 1; k >= 0; k--)
5612                 nft_expr_destroy(ctx, expr_array[k]);
5613
5614         return -ENOMEM;
5615 }
5616
5617 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5618                                    const struct nft_set_ext_tmpl *tmpl,
5619                                    const struct nft_set_ext *ext,
5620                                    struct nft_expr *expr_array[],
5621                                    u32 num_exprs)
5622 {
5623         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5624         u32 len = sizeof(struct nft_set_elem_expr);
5625         struct nft_expr *expr;
5626         int i, err;
5627
5628         if (num_exprs == 0)
5629                 return 0;
5630
5631         for (i = 0; i < num_exprs; i++)
5632                 len += expr_array[i]->ops->size;
5633
5634         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
5635                 return -EINVAL;
5636
5637         for (i = 0; i < num_exprs; i++) {
5638                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5639                 err = nft_expr_clone(expr, expr_array[i]);
5640                 if (err < 0)
5641                         goto err_elem_expr_setup;
5642
5643                 elem_expr->size += expr_array[i]->ops->size;
5644                 nft_expr_destroy(ctx, expr_array[i]);
5645                 expr_array[i] = NULL;
5646         }
5647
5648         return 0;
5649
5650 err_elem_expr_setup:
5651         for (; i < num_exprs; i++) {
5652                 nft_expr_destroy(ctx, expr_array[i]);
5653                 expr_array[i] = NULL;
5654         }
5655
5656         return -ENOMEM;
5657 }
5658
5659 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5660                                             const struct nft_set *set)
5661 {
5662         struct nft_set_elem_catchall *catchall;
5663         u8 genmask = nft_genmask_cur(net);
5664         struct nft_set_ext *ext;
5665
5666         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5667                 ext = nft_set_elem_ext(set, catchall->elem);
5668                 if (nft_set_elem_active(ext, genmask) &&
5669                     !nft_set_elem_expired(ext))
5670                         return ext;
5671         }
5672
5673         return NULL;
5674 }
5675 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5676
5677 void *nft_set_catchall_gc(const struct nft_set *set)
5678 {
5679         struct nft_set_elem_catchall *catchall, *next;
5680         struct nft_set_ext *ext;
5681         void *elem = NULL;
5682
5683         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5684                 ext = nft_set_elem_ext(set, catchall->elem);
5685
5686                 if (!nft_set_elem_expired(ext) ||
5687                     nft_set_elem_mark_busy(ext))
5688                         continue;
5689
5690                 elem = catchall->elem;
5691                 list_del_rcu(&catchall->list);
5692                 kfree_rcu(catchall, rcu);
5693                 break;
5694         }
5695
5696         return elem;
5697 }
5698 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5699
5700 static int nft_setelem_catchall_insert(const struct net *net,
5701                                        struct nft_set *set,
5702                                        const struct nft_set_elem *elem,
5703                                        struct nft_set_ext **pext)
5704 {
5705         struct nft_set_elem_catchall *catchall;
5706         u8 genmask = nft_genmask_next(net);
5707         struct nft_set_ext *ext;
5708
5709         list_for_each_entry(catchall, &set->catchall_list, list) {
5710                 ext = nft_set_elem_ext(set, catchall->elem);
5711                 if (nft_set_elem_active(ext, genmask)) {
5712                         *pext = ext;
5713                         return -EEXIST;
5714                 }
5715         }
5716
5717         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5718         if (!catchall)
5719                 return -ENOMEM;
5720
5721         catchall->elem = elem->priv;
5722         list_add_tail_rcu(&catchall->list, &set->catchall_list);
5723
5724         return 0;
5725 }
5726
5727 static int nft_setelem_insert(const struct net *net,
5728                               struct nft_set *set,
5729                               const struct nft_set_elem *elem,
5730                               struct nft_set_ext **ext, unsigned int flags)
5731 {
5732         int ret;
5733
5734         if (flags & NFT_SET_ELEM_CATCHALL)
5735                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5736         else
5737                 ret = set->ops->insert(net, set, elem, ext);
5738
5739         return ret;
5740 }
5741
5742 static bool nft_setelem_is_catchall(const struct nft_set *set,
5743                                     const struct nft_set_elem *elem)
5744 {
5745         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5746
5747         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5748             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5749                 return true;
5750
5751         return false;
5752 }
5753
5754 static void nft_setelem_activate(struct net *net, struct nft_set *set,
5755                                  struct nft_set_elem *elem)
5756 {
5757         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5758
5759         if (nft_setelem_is_catchall(set, elem)) {
5760                 nft_set_elem_change_active(net, set, ext);
5761                 nft_set_elem_clear_busy(ext);
5762         } else {
5763                 set->ops->activate(net, set, elem);
5764         }
5765 }
5766
5767 static int nft_setelem_catchall_deactivate(const struct net *net,
5768                                            struct nft_set *set,
5769                                            struct nft_set_elem *elem)
5770 {
5771         struct nft_set_elem_catchall *catchall;
5772         struct nft_set_ext *ext;
5773
5774         list_for_each_entry(catchall, &set->catchall_list, list) {
5775                 ext = nft_set_elem_ext(set, catchall->elem);
5776                 if (!nft_is_active(net, ext) ||
5777                     nft_set_elem_mark_busy(ext))
5778                         continue;
5779
5780                 kfree(elem->priv);
5781                 elem->priv = catchall->elem;
5782                 nft_set_elem_change_active(net, set, ext);
5783                 return 0;
5784         }
5785
5786         return -ENOENT;
5787 }
5788
5789 static int __nft_setelem_deactivate(const struct net *net,
5790                                     struct nft_set *set,
5791                                     struct nft_set_elem *elem)
5792 {
5793         void *priv;
5794
5795         priv = set->ops->deactivate(net, set, elem);
5796         if (!priv)
5797                 return -ENOENT;
5798
5799         kfree(elem->priv);
5800         elem->priv = priv;
5801         set->ndeact++;
5802
5803         return 0;
5804 }
5805
5806 static int nft_setelem_deactivate(const struct net *net,
5807                                   struct nft_set *set,
5808                                   struct nft_set_elem *elem, u32 flags)
5809 {
5810         int ret;
5811
5812         if (flags & NFT_SET_ELEM_CATCHALL)
5813                 ret = nft_setelem_catchall_deactivate(net, set, elem);
5814         else
5815                 ret = __nft_setelem_deactivate(net, set, elem);
5816
5817         return ret;
5818 }
5819
5820 static void nft_setelem_catchall_remove(const struct net *net,
5821                                         const struct nft_set *set,
5822                                         const struct nft_set_elem *elem)
5823 {
5824         struct nft_set_elem_catchall *catchall, *next;
5825
5826         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5827                 if (catchall->elem == elem->priv) {
5828                         list_del_rcu(&catchall->list);
5829                         kfree_rcu(catchall, rcu);
5830                         break;
5831                 }
5832         }
5833 }
5834
5835 static void nft_setelem_remove(const struct net *net,
5836                                const struct nft_set *set,
5837                                const struct nft_set_elem *elem)
5838 {
5839         if (nft_setelem_is_catchall(set, elem))
5840                 nft_setelem_catchall_remove(net, set, elem);
5841         else
5842                 set->ops->remove(net, set, elem);
5843 }
5844
5845 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5846                             const struct nlattr *attr, u32 nlmsg_flags)
5847 {
5848         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5849         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5850         u8 genmask = nft_genmask_next(ctx->net);
5851         u32 flags = 0, size = 0, num_exprs = 0;
5852         struct nft_set_ext_tmpl tmpl;
5853         struct nft_set_ext *ext, *ext2;
5854         struct nft_set_elem elem;
5855         struct nft_set_binding *binding;
5856         struct nft_object *obj = NULL;
5857         struct nft_userdata *udata;
5858         struct nft_data_desc desc;
5859         enum nft_registers dreg;
5860         struct nft_trans *trans;
5861         u64 timeout;
5862         u64 expiration;
5863         int err, i;
5864         u8 ulen;
5865
5866         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5867                                           nft_set_elem_policy, NULL);
5868         if (err < 0)
5869                 return err;
5870
5871         nft_set_ext_prepare(&tmpl);
5872
5873         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5874         if (err < 0)
5875                 return err;
5876
5877         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5878                 return -EINVAL;
5879
5880         if (flags != 0) {
5881                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5882                 if (err < 0)
5883                         return err;
5884         }
5885
5886         if (set->flags & NFT_SET_MAP) {
5887                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5888                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5889                         return -EINVAL;
5890         } else {
5891                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5892                         return -EINVAL;
5893         }
5894
5895         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5896              (nla[NFTA_SET_ELEM_DATA] ||
5897               nla[NFTA_SET_ELEM_OBJREF] ||
5898               nla[NFTA_SET_ELEM_TIMEOUT] ||
5899               nla[NFTA_SET_ELEM_EXPIRATION] ||
5900               nla[NFTA_SET_ELEM_USERDATA] ||
5901               nla[NFTA_SET_ELEM_EXPR] ||
5902               nla[NFTA_SET_ELEM_EXPRESSIONS]))
5903                 return -EINVAL;
5904
5905         timeout = 0;
5906         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5907                 if (!(set->flags & NFT_SET_TIMEOUT))
5908                         return -EINVAL;
5909                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5910                                             &timeout);
5911                 if (err)
5912                         return err;
5913         } else if (set->flags & NFT_SET_TIMEOUT) {
5914                 timeout = set->timeout;
5915         }
5916
5917         expiration = 0;
5918         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5919                 if (!(set->flags & NFT_SET_TIMEOUT))
5920                         return -EINVAL;
5921                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5922                                             &expiration);
5923                 if (err)
5924                         return err;
5925         }
5926
5927         if (nla[NFTA_SET_ELEM_EXPR]) {
5928                 struct nft_expr *expr;
5929
5930                 if (set->num_exprs && set->num_exprs != 1)
5931                         return -EOPNOTSUPP;
5932
5933                 expr = nft_set_elem_expr_alloc(ctx, set,
5934                                                nla[NFTA_SET_ELEM_EXPR]);
5935                 if (IS_ERR(expr))
5936                         return PTR_ERR(expr);
5937
5938                 expr_array[0] = expr;
5939                 num_exprs = 1;
5940
5941                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
5942                         err = -EOPNOTSUPP;
5943                         goto err_set_elem_expr;
5944                 }
5945         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5946                 struct nft_expr *expr;
5947                 struct nlattr *tmp;
5948                 int left;
5949
5950                 i = 0;
5951                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
5952                         if (i == NFT_SET_EXPR_MAX ||
5953                             (set->num_exprs && set->num_exprs == i)) {
5954                                 err = -E2BIG;
5955                                 goto err_set_elem_expr;
5956                         }
5957                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
5958                                 err = -EINVAL;
5959                                 goto err_set_elem_expr;
5960                         }
5961                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5962                         if (IS_ERR(expr)) {
5963                                 err = PTR_ERR(expr);
5964                                 goto err_set_elem_expr;
5965                         }
5966                         expr_array[i] = expr;
5967                         num_exprs++;
5968
5969                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
5970                                 err = -EOPNOTSUPP;
5971                                 goto err_set_elem_expr;
5972                         }
5973                         i++;
5974                 }
5975                 if (set->num_exprs && set->num_exprs != i) {
5976                         err = -EOPNOTSUPP;
5977                         goto err_set_elem_expr;
5978                 }
5979         } else if (set->num_exprs > 0) {
5980                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5981                 if (err < 0)
5982                         goto err_set_elem_expr_clone;
5983
5984                 num_exprs = set->num_exprs;
5985         }
5986
5987         if (nla[NFTA_SET_ELEM_KEY]) {
5988                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5989                                             nla[NFTA_SET_ELEM_KEY]);
5990                 if (err < 0)
5991                         goto err_set_elem_expr;
5992
5993                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5994                 if (err < 0)
5995                         goto err_parse_key;
5996         }
5997
5998         if (nla[NFTA_SET_ELEM_KEY_END]) {
5999                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6000                                             nla[NFTA_SET_ELEM_KEY_END]);
6001                 if (err < 0)
6002                         goto err_parse_key;
6003
6004                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6005                 if (err < 0)
6006                         goto err_parse_key_end;
6007         }
6008
6009         if (timeout > 0) {
6010                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6011                 if (err < 0)
6012                         goto err_parse_key_end;
6013
6014                 if (timeout != set->timeout) {
6015                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6016                         if (err < 0)
6017                                 goto err_parse_key_end;
6018                 }
6019         }
6020
6021         if (num_exprs) {
6022                 for (i = 0; i < num_exprs; i++)
6023                         size += expr_array[i]->ops->size;
6024
6025                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6026                                              sizeof(struct nft_set_elem_expr) + size);
6027                 if (err < 0)
6028                         goto err_parse_key_end;
6029         }
6030
6031         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6032                 if (!(set->flags & NFT_SET_OBJECT)) {
6033                         err = -EINVAL;
6034                         goto err_parse_key_end;
6035                 }
6036                 obj = nft_obj_lookup(ctx->net, ctx->table,
6037                                      nla[NFTA_SET_ELEM_OBJREF],
6038                                      set->objtype, genmask);
6039                 if (IS_ERR(obj)) {
6040                         err = PTR_ERR(obj);
6041                         goto err_parse_key_end;
6042                 }
6043                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6044                 if (err < 0)
6045                         goto err_parse_key_end;
6046         }
6047
6048         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6049                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6050                                              nla[NFTA_SET_ELEM_DATA]);
6051                 if (err < 0)
6052                         goto err_parse_key_end;
6053
6054                 dreg = nft_type_to_reg(set->dtype);
6055                 list_for_each_entry(binding, &set->bindings, list) {
6056                         struct nft_ctx bind_ctx = {
6057                                 .net    = ctx->net,
6058                                 .family = ctx->family,
6059                                 .table  = ctx->table,
6060                                 .chain  = (struct nft_chain *)binding->chain,
6061                         };
6062
6063                         if (!(binding->flags & NFT_SET_MAP))
6064                                 continue;
6065
6066                         err = nft_validate_register_store(&bind_ctx, dreg,
6067                                                           &elem.data.val,
6068                                                           desc.type, desc.len);
6069                         if (err < 0)
6070                                 goto err_parse_data;
6071
6072                         if (desc.type == NFT_DATA_VERDICT &&
6073                             (elem.data.val.verdict.code == NFT_GOTO ||
6074                              elem.data.val.verdict.code == NFT_JUMP))
6075                                 nft_validate_state_update(ctx->net,
6076                                                           NFT_VALIDATE_NEED);
6077                 }
6078
6079                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6080                 if (err < 0)
6081                         goto err_parse_data;
6082         }
6083
6084         /* The full maximum length of userdata can exceed the maximum
6085          * offset value (U8_MAX) for following extensions, therefor it
6086          * must be the last extension added.
6087          */
6088         ulen = 0;
6089         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6090                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6091                 if (ulen > 0) {
6092                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6093                                                      ulen);
6094                         if (err < 0)
6095                                 goto err_parse_data;
6096                 }
6097         }
6098
6099         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6100                                       elem.key_end.val.data, elem.data.val.data,
6101                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6102         if (IS_ERR(elem.priv)) {
6103                 err = PTR_ERR(elem.priv);
6104                 goto err_parse_data;
6105         }
6106
6107         ext = nft_set_elem_ext(set, elem.priv);
6108         if (flags)
6109                 *nft_set_ext_flags(ext) = flags;
6110
6111         if (ulen > 0) {
6112                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6113                         err = -EINVAL;
6114                         goto err_elem_userdata;
6115                 }
6116                 udata = nft_set_ext_userdata(ext);
6117                 udata->len = ulen - 1;
6118                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6119         }
6120         if (obj) {
6121                 *nft_set_ext_obj(ext) = obj;
6122                 obj->use++;
6123         }
6124         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6125         if (err < 0)
6126                 goto err_elem_free;
6127
6128         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6129         if (trans == NULL) {
6130                 err = -ENOMEM;
6131                 goto err_elem_free;
6132         }
6133
6134         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6135
6136         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6137         if (err) {
6138                 if (err == -EEXIST) {
6139                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6140                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6141                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6142                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6143                                 goto err_element_clash;
6144                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6145                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6146                              memcmp(nft_set_ext_data(ext),
6147                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6148                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6149                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6150                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6151                                 goto err_element_clash;
6152                         else if (!(nlmsg_flags & NLM_F_EXCL))
6153                                 err = 0;
6154                 } else if (err == -ENOTEMPTY) {
6155                         /* ENOTEMPTY reports overlapping between this element
6156                          * and an existing one.
6157                          */
6158                         err = -EEXIST;
6159                 }
6160                 goto err_element_clash;
6161         }
6162
6163         if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6164             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6165                 err = -ENFILE;
6166                 goto err_set_full;
6167         }
6168
6169         nft_trans_elem(trans) = elem;
6170         nft_trans_commit_list_add_tail(ctx->net, trans);
6171         return 0;
6172
6173 err_set_full:
6174         nft_setelem_remove(ctx->net, set, &elem);
6175 err_element_clash:
6176         kfree(trans);
6177 err_elem_free:
6178         if (obj)
6179                 obj->use--;
6180 err_elem_userdata:
6181         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6182 err_parse_data:
6183         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6184                 nft_data_release(&elem.data.val, desc.type);
6185 err_parse_key_end:
6186         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6187 err_parse_key:
6188         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6189 err_set_elem_expr:
6190         for (i = 0; i < num_exprs && expr_array[i]; i++)
6191                 nft_expr_destroy(ctx, expr_array[i]);
6192 err_set_elem_expr_clone:
6193         return err;
6194 }
6195
6196 static int nf_tables_newsetelem(struct sk_buff *skb,
6197                                 const struct nfnl_info *info,
6198                                 const struct nlattr * const nla[])
6199 {
6200         struct nftables_pernet *nft_net = nft_pernet(info->net);
6201         struct netlink_ext_ack *extack = info->extack;
6202         u8 genmask = nft_genmask_next(info->net);
6203         u8 family = info->nfmsg->nfgen_family;
6204         struct net *net = info->net;
6205         const struct nlattr *attr;
6206         struct nft_table *table;
6207         struct nft_set *set;
6208         struct nft_ctx ctx;
6209         int rem, err;
6210
6211         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6212                 return -EINVAL;
6213
6214         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6215                                  genmask, NETLINK_CB(skb).portid);
6216         if (IS_ERR(table)) {
6217                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6218                 return PTR_ERR(table);
6219         }
6220
6221         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6222                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6223         if (IS_ERR(set))
6224                 return PTR_ERR(set);
6225
6226         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6227                 return -EBUSY;
6228
6229         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6230
6231         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6232                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6233                 if (err < 0) {
6234                         NL_SET_BAD_ATTR(extack, attr);
6235                         return err;
6236                 }
6237         }
6238
6239         if (nft_net->validate_state == NFT_VALIDATE_DO)
6240                 return nft_table_validate(net, table);
6241
6242         return 0;
6243 }
6244
6245 /**
6246  *      nft_data_hold - hold a nft_data item
6247  *
6248  *      @data: struct nft_data to release
6249  *      @type: type of data
6250  *
6251  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6252  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6253  *      NFT_GOTO verdicts. This function must be called on active data objects
6254  *      from the second phase of the commit protocol.
6255  */
6256 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6257 {
6258         struct nft_chain *chain;
6259         struct nft_rule *rule;
6260
6261         if (type == NFT_DATA_VERDICT) {
6262                 switch (data->verdict.code) {
6263                 case NFT_JUMP:
6264                 case NFT_GOTO:
6265                         chain = data->verdict.chain;
6266                         chain->use++;
6267
6268                         if (!nft_chain_is_bound(chain))
6269                                 break;
6270
6271                         chain->table->use++;
6272                         list_for_each_entry(rule, &chain->rules, list)
6273                                 chain->use++;
6274
6275                         nft_chain_add(chain->table, chain);
6276                         break;
6277                 }
6278         }
6279 }
6280
6281 static void nft_setelem_data_activate(const struct net *net,
6282                                       const struct nft_set *set,
6283                                       struct nft_set_elem *elem)
6284 {
6285         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6286
6287         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6288                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6289         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6290                 (*nft_set_ext_obj(ext))->use++;
6291 }
6292
6293 static void nft_setelem_data_deactivate(const struct net *net,
6294                                         const struct nft_set *set,
6295                                         struct nft_set_elem *elem)
6296 {
6297         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6298
6299         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6300                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6301         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6302                 (*nft_set_ext_obj(ext))->use--;
6303 }
6304
6305 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6306                            const struct nlattr *attr)
6307 {
6308         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6309         struct nft_set_ext_tmpl tmpl;
6310         struct nft_set_elem elem;
6311         struct nft_set_ext *ext;
6312         struct nft_trans *trans;
6313         u32 flags = 0;
6314         int err;
6315
6316         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6317                                           nft_set_elem_policy, NULL);
6318         if (err < 0)
6319                 return err;
6320
6321         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6322         if (err < 0)
6323                 return err;
6324
6325         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6326                 return -EINVAL;
6327
6328         nft_set_ext_prepare(&tmpl);
6329
6330         if (flags != 0) {
6331                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6332                 if (err < 0)
6333                         return err;
6334         }
6335
6336         if (nla[NFTA_SET_ELEM_KEY]) {
6337                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6338                                             nla[NFTA_SET_ELEM_KEY]);
6339                 if (err < 0)
6340                         return err;
6341
6342                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6343                 if (err < 0)
6344                         goto fail_elem;
6345         }
6346
6347         if (nla[NFTA_SET_ELEM_KEY_END]) {
6348                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6349                                             nla[NFTA_SET_ELEM_KEY_END]);
6350                 if (err < 0)
6351                         goto fail_elem;
6352
6353                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6354                 if (err < 0)
6355                         goto fail_elem_key_end;
6356         }
6357
6358         err = -ENOMEM;
6359         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6360                                       elem.key_end.val.data, NULL, 0, 0,
6361                                       GFP_KERNEL_ACCOUNT);
6362         if (IS_ERR(elem.priv)) {
6363                 err = PTR_ERR(elem.priv);
6364                 goto fail_elem_key_end;
6365         }
6366
6367         ext = nft_set_elem_ext(set, elem.priv);
6368         if (flags)
6369                 *nft_set_ext_flags(ext) = flags;
6370
6371         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6372         if (trans == NULL)
6373                 goto fail_trans;
6374
6375         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6376         if (err < 0)
6377                 goto fail_ops;
6378
6379         nft_setelem_data_deactivate(ctx->net, set, &elem);
6380
6381         nft_trans_elem(trans) = elem;
6382         nft_trans_commit_list_add_tail(ctx->net, trans);
6383         return 0;
6384
6385 fail_ops:
6386         kfree(trans);
6387 fail_trans:
6388         kfree(elem.priv);
6389 fail_elem_key_end:
6390         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6391 fail_elem:
6392         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6393         return err;
6394 }
6395
6396 static int nft_setelem_flush(const struct nft_ctx *ctx,
6397                              struct nft_set *set,
6398                              const struct nft_set_iter *iter,
6399                              struct nft_set_elem *elem)
6400 {
6401         struct nft_trans *trans;
6402         int err;
6403
6404         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6405                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
6406         if (!trans)
6407                 return -ENOMEM;
6408
6409         if (!set->ops->flush(ctx->net, set, elem->priv)) {
6410                 err = -ENOENT;
6411                 goto err1;
6412         }
6413         set->ndeact++;
6414
6415         nft_setelem_data_deactivate(ctx->net, set, elem);
6416         nft_trans_elem_set(trans) = set;
6417         nft_trans_elem(trans) = *elem;
6418         nft_trans_commit_list_add_tail(ctx->net, trans);
6419
6420         return 0;
6421 err1:
6422         kfree(trans);
6423         return err;
6424 }
6425
6426 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6427                                     struct nft_set *set,
6428                                     struct nft_set_elem *elem)
6429 {
6430         struct nft_trans *trans;
6431
6432         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6433                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
6434         if (!trans)
6435                 return -ENOMEM;
6436
6437         nft_setelem_data_deactivate(ctx->net, set, elem);
6438         nft_trans_elem_set(trans) = set;
6439         nft_trans_elem(trans) = *elem;
6440         nft_trans_commit_list_add_tail(ctx->net, trans);
6441
6442         return 0;
6443 }
6444
6445 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6446                                   struct nft_set *set)
6447 {
6448         u8 genmask = nft_genmask_next(ctx->net);
6449         struct nft_set_elem_catchall *catchall;
6450         struct nft_set_elem elem;
6451         struct nft_set_ext *ext;
6452         int ret = 0;
6453
6454         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6455                 ext = nft_set_elem_ext(set, catchall->elem);
6456                 if (!nft_set_elem_active(ext, genmask) ||
6457                     nft_set_elem_mark_busy(ext))
6458                         continue;
6459
6460                 elem.priv = catchall->elem;
6461                 ret = __nft_set_catchall_flush(ctx, set, &elem);
6462                 if (ret < 0)
6463                         break;
6464         }
6465
6466         return ret;
6467 }
6468
6469 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6470 {
6471         struct nft_set_iter iter = {
6472                 .genmask        = genmask,
6473                 .fn             = nft_setelem_flush,
6474         };
6475
6476         set->ops->walk(ctx, set, &iter);
6477         if (!iter.err)
6478                 iter.err = nft_set_catchall_flush(ctx, set);
6479
6480         return iter.err;
6481 }
6482
6483 static int nf_tables_delsetelem(struct sk_buff *skb,
6484                                 const struct nfnl_info *info,
6485                                 const struct nlattr * const nla[])
6486 {
6487         struct netlink_ext_ack *extack = info->extack;
6488         u8 genmask = nft_genmask_next(info->net);
6489         u8 family = info->nfmsg->nfgen_family;
6490         struct net *net = info->net;
6491         const struct nlattr *attr;
6492         struct nft_table *table;
6493         struct nft_set *set;
6494         struct nft_ctx ctx;
6495         int rem, err = 0;
6496
6497         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6498                                  genmask, NETLINK_CB(skb).portid);
6499         if (IS_ERR(table)) {
6500                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6501                 return PTR_ERR(table);
6502         }
6503
6504         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6505         if (IS_ERR(set))
6506                 return PTR_ERR(set);
6507         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6508                 return -EBUSY;
6509
6510         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6511
6512         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6513                 return nft_set_flush(&ctx, set, genmask);
6514
6515         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6516                 err = nft_del_setelem(&ctx, set, attr);
6517                 if (err < 0) {
6518                         NL_SET_BAD_ATTR(extack, attr);
6519                         break;
6520                 }
6521         }
6522         return err;
6523 }
6524
6525 void nft_set_gc_batch_release(struct rcu_head *rcu)
6526 {
6527         struct nft_set_gc_batch *gcb;
6528         unsigned int i;
6529
6530         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6531         for (i = 0; i < gcb->head.cnt; i++)
6532                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6533         kfree(gcb);
6534 }
6535
6536 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6537                                                 gfp_t gfp)
6538 {
6539         struct nft_set_gc_batch *gcb;
6540
6541         gcb = kzalloc(sizeof(*gcb), gfp);
6542         if (gcb == NULL)
6543                 return gcb;
6544         gcb->head.set = set;
6545         return gcb;
6546 }
6547
6548 /*
6549  * Stateful objects
6550  */
6551
6552 /**
6553  *      nft_register_obj- register nf_tables stateful object type
6554  *      @obj_type: object type
6555  *
6556  *      Registers the object type for use with nf_tables. Returns zero on
6557  *      success or a negative errno code otherwise.
6558  */
6559 int nft_register_obj(struct nft_object_type *obj_type)
6560 {
6561         if (obj_type->type == NFT_OBJECT_UNSPEC)
6562                 return -EINVAL;
6563
6564         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6565         list_add_rcu(&obj_type->list, &nf_tables_objects);
6566         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6567         return 0;
6568 }
6569 EXPORT_SYMBOL_GPL(nft_register_obj);
6570
6571 /**
6572  *      nft_unregister_obj - unregister nf_tables object type
6573  *      @obj_type: object type
6574  *
6575  *      Unregisters the object type for use with nf_tables.
6576  */
6577 void nft_unregister_obj(struct nft_object_type *obj_type)
6578 {
6579         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6580         list_del_rcu(&obj_type->list);
6581         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6582 }
6583 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6584
6585 struct nft_object *nft_obj_lookup(const struct net *net,
6586                                   const struct nft_table *table,
6587                                   const struct nlattr *nla, u32 objtype,
6588                                   u8 genmask)
6589 {
6590         struct nft_object_hash_key k = { .table = table };
6591         char search[NFT_OBJ_MAXNAMELEN];
6592         struct rhlist_head *tmp, *list;
6593         struct nft_object *obj;
6594
6595         nla_strscpy(search, nla, sizeof(search));
6596         k.name = search;
6597
6598         WARN_ON_ONCE(!rcu_read_lock_held() &&
6599                      !lockdep_commit_lock_is_held(net));
6600
6601         rcu_read_lock();
6602         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6603         if (!list)
6604                 goto out;
6605
6606         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6607                 if (objtype == obj->ops->type->type &&
6608                     nft_active_genmask(obj, genmask)) {
6609                         rcu_read_unlock();
6610                         return obj;
6611                 }
6612         }
6613 out:
6614         rcu_read_unlock();
6615         return ERR_PTR(-ENOENT);
6616 }
6617 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6618
6619 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6620                                                   const struct nlattr *nla,
6621                                                   u32 objtype, u8 genmask)
6622 {
6623         struct nft_object *obj;
6624
6625         list_for_each_entry(obj, &table->objects, list) {
6626                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6627                     objtype == obj->ops->type->type &&
6628                     nft_active_genmask(obj, genmask))
6629                         return obj;
6630         }
6631         return ERR_PTR(-ENOENT);
6632 }
6633
6634 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6635         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
6636                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
6637         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
6638                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
6639         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
6640         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
6641         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
6642         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
6643                                     .len = NFT_USERDATA_MAXLEN },
6644 };
6645
6646 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6647                                        const struct nft_object_type *type,
6648                                        const struct nlattr *attr)
6649 {
6650         struct nlattr **tb;
6651         const struct nft_object_ops *ops;
6652         struct nft_object *obj;
6653         int err = -ENOMEM;
6654
6655         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6656         if (!tb)
6657                 goto err1;
6658
6659         if (attr) {
6660                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6661                                                   type->policy, NULL);
6662                 if (err < 0)
6663                         goto err2;
6664         } else {
6665                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6666         }
6667
6668         if (type->select_ops) {
6669                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6670                 if (IS_ERR(ops)) {
6671                         err = PTR_ERR(ops);
6672                         goto err2;
6673                 }
6674         } else {
6675                 ops = type->ops;
6676         }
6677
6678         err = -ENOMEM;
6679         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
6680         if (!obj)
6681                 goto err2;
6682
6683         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6684         if (err < 0)
6685                 goto err3;
6686
6687         obj->ops = ops;
6688
6689         kfree(tb);
6690         return obj;
6691 err3:
6692         kfree(obj);
6693 err2:
6694         kfree(tb);
6695 err1:
6696         return ERR_PTR(err);
6697 }
6698
6699 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6700                            struct nft_object *obj, bool reset)
6701 {
6702         struct nlattr *nest;
6703
6704         nest = nla_nest_start_noflag(skb, attr);
6705         if (!nest)
6706                 goto nla_put_failure;
6707         if (obj->ops->dump(skb, obj, reset) < 0)
6708                 goto nla_put_failure;
6709         nla_nest_end(skb, nest);
6710         return 0;
6711
6712 nla_put_failure:
6713         return -1;
6714 }
6715
6716 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6717 {
6718         const struct nft_object_type *type;
6719
6720         list_for_each_entry(type, &nf_tables_objects, list) {
6721                 if (objtype == type->type)
6722                         return type;
6723         }
6724         return NULL;
6725 }
6726
6727 static const struct nft_object_type *
6728 nft_obj_type_get(struct net *net, u32 objtype)
6729 {
6730         const struct nft_object_type *type;
6731
6732         type = __nft_obj_type_get(objtype);
6733         if (type != NULL && try_module_get(type->owner))
6734                 return type;
6735
6736         lockdep_nfnl_nft_mutex_not_held();
6737 #ifdef CONFIG_MODULES
6738         if (type == NULL) {
6739                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6740                         return ERR_PTR(-EAGAIN);
6741         }
6742 #endif
6743         return ERR_PTR(-ENOENT);
6744 }
6745
6746 static int nf_tables_updobj(const struct nft_ctx *ctx,
6747                             const struct nft_object_type *type,
6748                             const struct nlattr *attr,
6749                             struct nft_object *obj)
6750 {
6751         struct nft_object *newobj;
6752         struct nft_trans *trans;
6753         int err = -ENOMEM;
6754
6755         if (!try_module_get(type->owner))
6756                 return -ENOENT;
6757
6758         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6759                                 sizeof(struct nft_trans_obj));
6760         if (!trans)
6761                 goto err_trans;
6762
6763         newobj = nft_obj_init(ctx, type, attr);
6764         if (IS_ERR(newobj)) {
6765                 err = PTR_ERR(newobj);
6766                 goto err_free_trans;
6767         }
6768
6769         nft_trans_obj(trans) = obj;
6770         nft_trans_obj_update(trans) = true;
6771         nft_trans_obj_newobj(trans) = newobj;
6772         nft_trans_commit_list_add_tail(ctx->net, trans);
6773
6774         return 0;
6775
6776 err_free_trans:
6777         kfree(trans);
6778 err_trans:
6779         module_put(type->owner);
6780         return err;
6781 }
6782
6783 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
6784                             const struct nlattr * const nla[])
6785 {
6786         struct netlink_ext_ack *extack = info->extack;
6787         u8 genmask = nft_genmask_next(info->net);
6788         u8 family = info->nfmsg->nfgen_family;
6789         const struct nft_object_type *type;
6790         struct net *net = info->net;
6791         struct nft_table *table;
6792         struct nft_object *obj;
6793         struct nft_ctx ctx;
6794         u32 objtype;
6795         int err;
6796
6797         if (!nla[NFTA_OBJ_TYPE] ||
6798             !nla[NFTA_OBJ_NAME] ||
6799             !nla[NFTA_OBJ_DATA])
6800                 return -EINVAL;
6801
6802         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6803                                  NETLINK_CB(skb).portid);
6804         if (IS_ERR(table)) {
6805                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6806                 return PTR_ERR(table);
6807         }
6808
6809         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6810         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6811         if (IS_ERR(obj)) {
6812                 err = PTR_ERR(obj);
6813                 if (err != -ENOENT) {
6814                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6815                         return err;
6816                 }
6817         } else {
6818                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
6819                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6820                         return -EEXIST;
6821                 }
6822                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
6823                         return -EOPNOTSUPP;
6824
6825                 type = __nft_obj_type_get(objtype);
6826                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6827
6828                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6829         }
6830
6831         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6832
6833         type = nft_obj_type_get(net, objtype);
6834         if (IS_ERR(type))
6835                 return PTR_ERR(type);
6836
6837         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6838         if (IS_ERR(obj)) {
6839                 err = PTR_ERR(obj);
6840                 goto err_init;
6841         }
6842         obj->key.table = table;
6843         obj->handle = nf_tables_alloc_handle(table);
6844
6845         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
6846         if (!obj->key.name) {
6847                 err = -ENOMEM;
6848                 goto err_strdup;
6849         }
6850
6851         if (nla[NFTA_OBJ_USERDATA]) {
6852                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6853                 if (obj->udata == NULL)
6854                         goto err_userdata;
6855
6856                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6857         }
6858
6859         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6860         if (err < 0)
6861                 goto err_trans;
6862
6863         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6864                               nft_objname_ht_params);
6865         if (err < 0)
6866                 goto err_obj_ht;
6867
6868         list_add_tail_rcu(&obj->list, &table->objects);
6869         table->use++;
6870         return 0;
6871 err_obj_ht:
6872         /* queued in transaction log */
6873         INIT_LIST_HEAD(&obj->list);
6874         return err;
6875 err_trans:
6876         kfree(obj->udata);
6877 err_userdata:
6878         kfree(obj->key.name);
6879 err_strdup:
6880         if (obj->ops->destroy)
6881                 obj->ops->destroy(&ctx, obj);
6882         kfree(obj);
6883 err_init:
6884         module_put(type->owner);
6885         return err;
6886 }
6887
6888 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6889                                    u32 portid, u32 seq, int event, u32 flags,
6890                                    int family, const struct nft_table *table,
6891                                    struct nft_object *obj, bool reset)
6892 {
6893         struct nlmsghdr *nlh;
6894
6895         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6896         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
6897                            NFNETLINK_V0, nft_base_seq(net));
6898         if (!nlh)
6899                 goto nla_put_failure;
6900
6901         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6902             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6903             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6904             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6905             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6906             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6907                          NFTA_OBJ_PAD))
6908                 goto nla_put_failure;
6909
6910         if (obj->udata &&
6911             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6912                 goto nla_put_failure;
6913
6914         nlmsg_end(skb, nlh);
6915         return 0;
6916
6917 nla_put_failure:
6918         nlmsg_trim(skb, nlh);
6919         return -1;
6920 }
6921
6922 struct nft_obj_filter {
6923         char            *table;
6924         u32             type;
6925 };
6926
6927 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6928 {
6929         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6930         const struct nft_table *table;
6931         unsigned int idx = 0, s_idx = cb->args[0];
6932         struct nft_obj_filter *filter = cb->data;
6933         struct net *net = sock_net(skb->sk);
6934         int family = nfmsg->nfgen_family;
6935         struct nftables_pernet *nft_net;
6936         struct nft_object *obj;
6937         bool reset = false;
6938
6939         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6940                 reset = true;
6941
6942         rcu_read_lock();
6943         nft_net = nft_pernet(net);
6944         cb->seq = nft_net->base_seq;
6945
6946         list_for_each_entry_rcu(table, &nft_net->tables, list) {
6947                 if (family != NFPROTO_UNSPEC && family != table->family)
6948                         continue;
6949
6950                 list_for_each_entry_rcu(obj, &table->objects, list) {
6951                         if (!nft_is_active(net, obj))
6952                                 goto cont;
6953                         if (idx < s_idx)
6954                                 goto cont;
6955                         if (idx > s_idx)
6956                                 memset(&cb->args[1], 0,
6957                                        sizeof(cb->args) - sizeof(cb->args[0]));
6958                         if (filter && filter->table &&
6959                             strcmp(filter->table, table->name))
6960                                 goto cont;
6961                         if (filter &&
6962                             filter->type != NFT_OBJECT_UNSPEC &&
6963                             obj->ops->type->type != filter->type)
6964                                 goto cont;
6965                         if (reset) {
6966                                 char *buf = kasprintf(GFP_ATOMIC,
6967                                                       "%s:%u",
6968                                                       table->name,
6969                                                       nft_net->base_seq);
6970
6971                                 audit_log_nfcfg(buf,
6972                                                 family,
6973                                                 obj->handle,
6974                                                 AUDIT_NFT_OP_OBJ_RESET,
6975                                                 GFP_ATOMIC);
6976                                 kfree(buf);
6977                         }
6978
6979                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6980                                                     cb->nlh->nlmsg_seq,
6981                                                     NFT_MSG_NEWOBJ,
6982                                                     NLM_F_MULTI | NLM_F_APPEND,
6983                                                     table->family, table,
6984                                                     obj, reset) < 0)
6985                                 goto done;
6986
6987                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6988 cont:
6989                         idx++;
6990                 }
6991         }
6992 done:
6993         rcu_read_unlock();
6994
6995         cb->args[0] = idx;
6996         return skb->len;
6997 }
6998
6999 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7000 {
7001         const struct nlattr * const *nla = cb->data;
7002         struct nft_obj_filter *filter = NULL;
7003
7004         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7005                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7006                 if (!filter)
7007                         return -ENOMEM;
7008
7009                 if (nla[NFTA_OBJ_TABLE]) {
7010                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7011                         if (!filter->table) {
7012                                 kfree(filter);
7013                                 return -ENOMEM;
7014                         }
7015                 }
7016
7017                 if (nla[NFTA_OBJ_TYPE])
7018                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7019         }
7020
7021         cb->data = filter;
7022         return 0;
7023 }
7024
7025 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7026 {
7027         struct nft_obj_filter *filter = cb->data;
7028
7029         if (filter) {
7030                 kfree(filter->table);
7031                 kfree(filter);
7032         }
7033
7034         return 0;
7035 }
7036
7037 /* called with rcu_read_lock held */
7038 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7039                             const struct nlattr * const nla[])
7040 {
7041         struct netlink_ext_ack *extack = info->extack;
7042         u8 genmask = nft_genmask_cur(info->net);
7043         u8 family = info->nfmsg->nfgen_family;
7044         const struct nft_table *table;
7045         struct net *net = info->net;
7046         struct nft_object *obj;
7047         struct sk_buff *skb2;
7048         bool reset = false;
7049         u32 objtype;
7050         int err;
7051
7052         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7053                 struct netlink_dump_control c = {
7054                         .start = nf_tables_dump_obj_start,
7055                         .dump = nf_tables_dump_obj,
7056                         .done = nf_tables_dump_obj_done,
7057                         .module = THIS_MODULE,
7058                         .data = (void *)nla,
7059                 };
7060
7061                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7062         }
7063
7064         if (!nla[NFTA_OBJ_NAME] ||
7065             !nla[NFTA_OBJ_TYPE])
7066                 return -EINVAL;
7067
7068         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7069         if (IS_ERR(table)) {
7070                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7071                 return PTR_ERR(table);
7072         }
7073
7074         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7075         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7076         if (IS_ERR(obj)) {
7077                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7078                 return PTR_ERR(obj);
7079         }
7080
7081         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7082         if (!skb2)
7083                 return -ENOMEM;
7084
7085         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7086                 reset = true;
7087
7088         if (reset) {
7089                 const struct nftables_pernet *nft_net;
7090                 char *buf;
7091
7092                 nft_net = nft_pernet(net);
7093                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7094
7095                 audit_log_nfcfg(buf,
7096                                 family,
7097                                 obj->handle,
7098                                 AUDIT_NFT_OP_OBJ_RESET,
7099                                 GFP_ATOMIC);
7100                 kfree(buf);
7101         }
7102
7103         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7104                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7105                                       family, table, obj, reset);
7106         if (err < 0)
7107                 goto err_fill_obj_info;
7108
7109         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7110
7111 err_fill_obj_info:
7112         kfree_skb(skb2);
7113         return err;
7114 }
7115
7116 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7117 {
7118         if (obj->ops->destroy)
7119                 obj->ops->destroy(ctx, obj);
7120
7121         module_put(obj->ops->type->owner);
7122         kfree(obj->key.name);
7123         kfree(obj->udata);
7124         kfree(obj);
7125 }
7126
7127 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7128                             const struct nlattr * const nla[])
7129 {
7130         struct netlink_ext_ack *extack = info->extack;
7131         u8 genmask = nft_genmask_next(info->net);
7132         u8 family = info->nfmsg->nfgen_family;
7133         struct net *net = info->net;
7134         const struct nlattr *attr;
7135         struct nft_table *table;
7136         struct nft_object *obj;
7137         struct nft_ctx ctx;
7138         u32 objtype;
7139
7140         if (!nla[NFTA_OBJ_TYPE] ||
7141             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7142                 return -EINVAL;
7143
7144         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7145                                  NETLINK_CB(skb).portid);
7146         if (IS_ERR(table)) {
7147                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7148                 return PTR_ERR(table);
7149         }
7150
7151         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7152         if (nla[NFTA_OBJ_HANDLE]) {
7153                 attr = nla[NFTA_OBJ_HANDLE];
7154                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7155         } else {
7156                 attr = nla[NFTA_OBJ_NAME];
7157                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7158         }
7159
7160         if (IS_ERR(obj)) {
7161                 NL_SET_BAD_ATTR(extack, attr);
7162                 return PTR_ERR(obj);
7163         }
7164         if (obj->use > 0) {
7165                 NL_SET_BAD_ATTR(extack, attr);
7166                 return -EBUSY;
7167         }
7168
7169         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7170
7171         return nft_delobj(&ctx, obj);
7172 }
7173
7174 void nft_obj_notify(struct net *net, const struct nft_table *table,
7175                     struct nft_object *obj, u32 portid, u32 seq, int event,
7176                     u16 flags, int family, int report, gfp_t gfp)
7177 {
7178         struct nftables_pernet *nft_net = nft_pernet(net);
7179         struct sk_buff *skb;
7180         int err;
7181         char *buf = kasprintf(gfp, "%s:%u",
7182                               table->name, nft_net->base_seq);
7183
7184         audit_log_nfcfg(buf,
7185                         family,
7186                         obj->handle,
7187                         event == NFT_MSG_NEWOBJ ?
7188                                  AUDIT_NFT_OP_OBJ_REGISTER :
7189                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7190                         gfp);
7191         kfree(buf);
7192
7193         if (!report &&
7194             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7195                 return;
7196
7197         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7198         if (skb == NULL)
7199                 goto err;
7200
7201         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7202                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7203                                       family, table, obj, false);
7204         if (err < 0) {
7205                 kfree_skb(skb);
7206                 goto err;
7207         }
7208
7209         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7210         return;
7211 err:
7212         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7213 }
7214 EXPORT_SYMBOL_GPL(nft_obj_notify);
7215
7216 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7217                                  struct nft_object *obj, int event)
7218 {
7219         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7220                        ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7221 }
7222
7223 /*
7224  * Flow tables
7225  */
7226 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7227 {
7228         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7229         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7230         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7231 }
7232 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7233
7234 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7235 {
7236         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7237         list_del_rcu(&type->list);
7238         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7239 }
7240 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7241
7242 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7243         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7244                                             .len = NFT_NAME_MAXLEN - 1 },
7245         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7246                                             .len = NFT_NAME_MAXLEN - 1 },
7247         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7248         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7249         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7250 };
7251
7252 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7253                                            const struct nlattr *nla, u8 genmask)
7254 {
7255         struct nft_flowtable *flowtable;
7256
7257         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7258                 if (!nla_strcmp(nla, flowtable->name) &&
7259                     nft_active_genmask(flowtable, genmask))
7260                         return flowtable;
7261         }
7262         return ERR_PTR(-ENOENT);
7263 }
7264 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7265
7266 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7267                                     struct nft_flowtable *flowtable,
7268                                     enum nft_trans_phase phase)
7269 {
7270         switch (phase) {
7271         case NFT_TRANS_PREPARE:
7272         case NFT_TRANS_ABORT:
7273         case NFT_TRANS_RELEASE:
7274                 flowtable->use--;
7275                 fallthrough;
7276         default:
7277                 return;
7278         }
7279 }
7280 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7281
7282 static struct nft_flowtable *
7283 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7284                               const struct nlattr *nla, u8 genmask)
7285 {
7286        struct nft_flowtable *flowtable;
7287
7288        list_for_each_entry(flowtable, &table->flowtables, list) {
7289                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7290                    nft_active_genmask(flowtable, genmask))
7291                        return flowtable;
7292        }
7293        return ERR_PTR(-ENOENT);
7294 }
7295
7296 struct nft_flowtable_hook {
7297         u32                     num;
7298         int                     priority;
7299         struct list_head        list;
7300 };
7301
7302 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7303         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
7304         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
7305         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
7306 };
7307
7308 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7309                                     const struct nlattr *attr,
7310                                     struct nft_flowtable_hook *flowtable_hook,
7311                                     struct nft_flowtable *flowtable, bool add)
7312 {
7313         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7314         struct nft_hook *hook;
7315         int hooknum, priority;
7316         int err;
7317
7318         INIT_LIST_HEAD(&flowtable_hook->list);
7319
7320         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7321                                           nft_flowtable_hook_policy, NULL);
7322         if (err < 0)
7323                 return err;
7324
7325         if (add) {
7326                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7327                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7328                         return -EINVAL;
7329
7330                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7331                 if (hooknum != NF_NETDEV_INGRESS)
7332                         return -EOPNOTSUPP;
7333
7334                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7335
7336                 flowtable_hook->priority        = priority;
7337                 flowtable_hook->num             = hooknum;
7338         } else {
7339                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7340                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7341                         if (hooknum != flowtable->hooknum)
7342                                 return -EOPNOTSUPP;
7343                 }
7344
7345                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7346                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7347                         if (priority != flowtable->data.priority)
7348                                 return -EOPNOTSUPP;
7349                 }
7350
7351                 flowtable_hook->priority        = flowtable->data.priority;
7352                 flowtable_hook->num             = flowtable->hooknum;
7353         }
7354
7355         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7356                 err = nf_tables_parse_netdev_hooks(ctx->net,
7357                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
7358                                                    &flowtable_hook->list);
7359                 if (err < 0)
7360                         return err;
7361         }
7362
7363         list_for_each_entry(hook, &flowtable_hook->list, list) {
7364                 hook->ops.pf            = NFPROTO_NETDEV;
7365                 hook->ops.hooknum       = flowtable_hook->num;
7366                 hook->ops.priority      = flowtable_hook->priority;
7367                 hook->ops.priv          = &flowtable->data;
7368                 hook->ops.hook          = flowtable->data.type->hook;
7369         }
7370
7371         return err;
7372 }
7373
7374 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7375 {
7376         const struct nf_flowtable_type *type;
7377
7378         list_for_each_entry(type, &nf_tables_flowtables, list) {
7379                 if (family == type->family)
7380                         return type;
7381         }
7382         return NULL;
7383 }
7384
7385 static const struct nf_flowtable_type *
7386 nft_flowtable_type_get(struct net *net, u8 family)
7387 {
7388         const struct nf_flowtable_type *type;
7389
7390         type = __nft_flowtable_type_get(family);
7391         if (type != NULL && try_module_get(type->owner))
7392                 return type;
7393
7394         lockdep_nfnl_nft_mutex_not_held();
7395 #ifdef CONFIG_MODULES
7396         if (type == NULL) {
7397                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7398                         return ERR_PTR(-EAGAIN);
7399         }
7400 #endif
7401         return ERR_PTR(-ENOENT);
7402 }
7403
7404 /* Only called from error and netdev event paths. */
7405 static void nft_unregister_flowtable_hook(struct net *net,
7406                                           struct nft_flowtable *flowtable,
7407                                           struct nft_hook *hook)
7408 {
7409         nf_unregister_net_hook(net, &hook->ops);
7410         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7411                                     FLOW_BLOCK_UNBIND);
7412 }
7413
7414 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7415                                                  struct list_head *hook_list,
7416                                                  bool release_netdev)
7417 {
7418         struct nft_hook *hook, *next;
7419
7420         list_for_each_entry_safe(hook, next, hook_list, list) {
7421                 nf_unregister_net_hook(net, &hook->ops);
7422                 if (release_netdev) {
7423                         list_del(&hook->list);
7424                         kfree_rcu(hook, rcu);
7425                 }
7426         }
7427 }
7428
7429 static void nft_unregister_flowtable_net_hooks(struct net *net,
7430                                                struct list_head *hook_list)
7431 {
7432         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7433 }
7434
7435 static int nft_register_flowtable_net_hooks(struct net *net,
7436                                             struct nft_table *table,
7437                                             struct list_head *hook_list,
7438                                             struct nft_flowtable *flowtable)
7439 {
7440         struct nft_hook *hook, *hook2, *next;
7441         struct nft_flowtable *ft;
7442         int err, i = 0;
7443
7444         list_for_each_entry(hook, hook_list, list) {
7445                 list_for_each_entry(ft, &table->flowtables, list) {
7446                         if (!nft_is_active_next(net, ft))
7447                                 continue;
7448
7449                         list_for_each_entry(hook2, &ft->hook_list, list) {
7450                                 if (hook->ops.dev == hook2->ops.dev &&
7451                                     hook->ops.pf == hook2->ops.pf) {
7452                                         err = -EEXIST;
7453                                         goto err_unregister_net_hooks;
7454                                 }
7455                         }
7456                 }
7457
7458                 err = flowtable->data.type->setup(&flowtable->data,
7459                                                   hook->ops.dev,
7460                                                   FLOW_BLOCK_BIND);
7461                 if (err < 0)
7462                         goto err_unregister_net_hooks;
7463
7464                 err = nf_register_net_hook(net, &hook->ops);
7465                 if (err < 0) {
7466                         flowtable->data.type->setup(&flowtable->data,
7467                                                     hook->ops.dev,
7468                                                     FLOW_BLOCK_UNBIND);
7469                         goto err_unregister_net_hooks;
7470                 }
7471
7472                 i++;
7473         }
7474
7475         return 0;
7476
7477 err_unregister_net_hooks:
7478         list_for_each_entry_safe(hook, next, hook_list, list) {
7479                 if (i-- <= 0)
7480                         break;
7481
7482                 nft_unregister_flowtable_hook(net, flowtable, hook);
7483                 list_del_rcu(&hook->list);
7484                 kfree_rcu(hook, rcu);
7485         }
7486
7487         return err;
7488 }
7489
7490 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7491 {
7492         struct nft_hook *hook, *next;
7493
7494         list_for_each_entry_safe(hook, next, hook_list, list) {
7495                 list_del_rcu(&hook->list);
7496                 kfree_rcu(hook, rcu);
7497         }
7498 }
7499
7500 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7501                                 struct nft_flowtable *flowtable)
7502 {
7503         const struct nlattr * const *nla = ctx->nla;
7504         struct nft_flowtable_hook flowtable_hook;
7505         struct nft_hook *hook, *next;
7506         struct nft_trans *trans;
7507         bool unregister = false;
7508         u32 flags;
7509         int err;
7510
7511         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7512                                        &flowtable_hook, flowtable, false);
7513         if (err < 0)
7514                 return err;
7515
7516         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7517                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7518                         list_del(&hook->list);
7519                         kfree(hook);
7520                 }
7521         }
7522
7523         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7524                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7525                 if (flags & ~NFT_FLOWTABLE_MASK) {
7526                         err = -EOPNOTSUPP;
7527                         goto err_flowtable_update_hook;
7528                 }
7529                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7530                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7531                         err = -EOPNOTSUPP;
7532                         goto err_flowtable_update_hook;
7533                 }
7534         } else {
7535                 flags = flowtable->data.flags;
7536         }
7537
7538         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7539                                                &flowtable_hook.list, flowtable);
7540         if (err < 0)
7541                 goto err_flowtable_update_hook;
7542
7543         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7544                                 sizeof(struct nft_trans_flowtable));
7545         if (!trans) {
7546                 unregister = true;
7547                 err = -ENOMEM;
7548                 goto err_flowtable_update_hook;
7549         }
7550
7551         nft_trans_flowtable_flags(trans) = flags;
7552         nft_trans_flowtable(trans) = flowtable;
7553         nft_trans_flowtable_update(trans) = true;
7554         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7555         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7556
7557         nft_trans_commit_list_add_tail(ctx->net, trans);
7558
7559         return 0;
7560
7561 err_flowtable_update_hook:
7562         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7563                 if (unregister)
7564                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7565                 list_del_rcu(&hook->list);
7566                 kfree_rcu(hook, rcu);
7567         }
7568
7569         return err;
7570
7571 }
7572
7573 static int nf_tables_newflowtable(struct sk_buff *skb,
7574                                   const struct nfnl_info *info,
7575                                   const struct nlattr * const nla[])
7576 {
7577         struct netlink_ext_ack *extack = info->extack;
7578         struct nft_flowtable_hook flowtable_hook;
7579         u8 genmask = nft_genmask_next(info->net);
7580         u8 family = info->nfmsg->nfgen_family;
7581         const struct nf_flowtable_type *type;
7582         struct nft_flowtable *flowtable;
7583         struct nft_hook *hook, *next;
7584         struct net *net = info->net;
7585         struct nft_table *table;
7586         struct nft_ctx ctx;
7587         int err;
7588
7589         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7590             !nla[NFTA_FLOWTABLE_NAME] ||
7591             !nla[NFTA_FLOWTABLE_HOOK])
7592                 return -EINVAL;
7593
7594         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7595                                  genmask, NETLINK_CB(skb).portid);
7596         if (IS_ERR(table)) {
7597                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7598                 return PTR_ERR(table);
7599         }
7600
7601         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7602                                          genmask);
7603         if (IS_ERR(flowtable)) {
7604                 err = PTR_ERR(flowtable);
7605                 if (err != -ENOENT) {
7606                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7607                         return err;
7608                 }
7609         } else {
7610                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7611                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7612                         return -EEXIST;
7613                 }
7614
7615                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7616
7617                 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7618         }
7619
7620         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7621
7622         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
7623         if (!flowtable)
7624                 return -ENOMEM;
7625
7626         flowtable->table = table;
7627         flowtable->handle = nf_tables_alloc_handle(table);
7628         INIT_LIST_HEAD(&flowtable->hook_list);
7629
7630         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
7631         if (!flowtable->name) {
7632                 err = -ENOMEM;
7633                 goto err1;
7634         }
7635
7636         type = nft_flowtable_type_get(net, family);
7637         if (IS_ERR(type)) {
7638                 err = PTR_ERR(type);
7639                 goto err2;
7640         }
7641
7642         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7643                 flowtable->data.flags =
7644                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7645                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7646                         err = -EOPNOTSUPP;
7647                         goto err3;
7648                 }
7649         }
7650
7651         write_pnet(&flowtable->data.net, net);
7652         flowtable->data.type = type;
7653         err = type->init(&flowtable->data);
7654         if (err < 0)
7655                 goto err3;
7656
7657         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7658                                        &flowtable_hook, flowtable, true);
7659         if (err < 0)
7660                 goto err4;
7661
7662         list_splice(&flowtable_hook.list, &flowtable->hook_list);
7663         flowtable->data.priority = flowtable_hook.priority;
7664         flowtable->hooknum = flowtable_hook.num;
7665
7666         err = nft_register_flowtable_net_hooks(ctx.net, table,
7667                                                &flowtable->hook_list,
7668                                                flowtable);
7669         if (err < 0) {
7670                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7671                 goto err4;
7672         }
7673
7674         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7675         if (err < 0)
7676                 goto err5;
7677
7678         list_add_tail_rcu(&flowtable->list, &table->flowtables);
7679         table->use++;
7680
7681         return 0;
7682 err5:
7683         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7684                 nft_unregister_flowtable_hook(net, flowtable, hook);
7685                 list_del_rcu(&hook->list);
7686                 kfree_rcu(hook, rcu);
7687         }
7688 err4:
7689         flowtable->data.type->free(&flowtable->data);
7690 err3:
7691         module_put(type->owner);
7692 err2:
7693         kfree(flowtable->name);
7694 err1:
7695         kfree(flowtable);
7696         return err;
7697 }
7698
7699 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7700 {
7701         struct nft_hook *this, *next;
7702
7703         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7704                 list_del(&this->list);
7705                 kfree(this);
7706         }
7707 }
7708
7709 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7710                                  struct nft_flowtable *flowtable)
7711 {
7712         const struct nlattr * const *nla = ctx->nla;
7713         struct nft_flowtable_hook flowtable_hook;
7714         LIST_HEAD(flowtable_del_list);
7715         struct nft_hook *this, *hook;
7716         struct nft_trans *trans;
7717         int err;
7718
7719         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7720                                        &flowtable_hook, flowtable, false);
7721         if (err < 0)
7722                 return err;
7723
7724         list_for_each_entry(this, &flowtable_hook.list, list) {
7725                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7726                 if (!hook) {
7727                         err = -ENOENT;
7728                         goto err_flowtable_del_hook;
7729                 }
7730                 list_move(&hook->list, &flowtable_del_list);
7731         }
7732
7733         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7734                                 sizeof(struct nft_trans_flowtable));
7735         if (!trans) {
7736                 err = -ENOMEM;
7737                 goto err_flowtable_del_hook;
7738         }
7739
7740         nft_trans_flowtable(trans) = flowtable;
7741         nft_trans_flowtable_update(trans) = true;
7742         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7743         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
7744         nft_flowtable_hook_release(&flowtable_hook);
7745
7746         nft_trans_commit_list_add_tail(ctx->net, trans);
7747
7748         return 0;
7749
7750 err_flowtable_del_hook:
7751         list_splice(&flowtable_del_list, &flowtable->hook_list);
7752         nft_flowtable_hook_release(&flowtable_hook);
7753
7754         return err;
7755 }
7756
7757 static int nf_tables_delflowtable(struct sk_buff *skb,
7758                                   const struct nfnl_info *info,
7759                                   const struct nlattr * const nla[])
7760 {
7761         struct netlink_ext_ack *extack = info->extack;
7762         u8 genmask = nft_genmask_next(info->net);
7763         u8 family = info->nfmsg->nfgen_family;
7764         struct nft_flowtable *flowtable;
7765         struct net *net = info->net;
7766         const struct nlattr *attr;
7767         struct nft_table *table;
7768         struct nft_ctx ctx;
7769
7770         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7771             (!nla[NFTA_FLOWTABLE_NAME] &&
7772              !nla[NFTA_FLOWTABLE_HANDLE]))
7773                 return -EINVAL;
7774
7775         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7776                                  genmask, NETLINK_CB(skb).portid);
7777         if (IS_ERR(table)) {
7778                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7779                 return PTR_ERR(table);
7780         }
7781
7782         if (nla[NFTA_FLOWTABLE_HANDLE]) {
7783                 attr = nla[NFTA_FLOWTABLE_HANDLE];
7784                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7785         } else {
7786                 attr = nla[NFTA_FLOWTABLE_NAME];
7787                 flowtable = nft_flowtable_lookup(table, attr, genmask);
7788         }
7789
7790         if (IS_ERR(flowtable)) {
7791                 NL_SET_BAD_ATTR(extack, attr);
7792                 return PTR_ERR(flowtable);
7793         }
7794
7795         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7796
7797         if (nla[NFTA_FLOWTABLE_HOOK])
7798                 return nft_delflowtable_hook(&ctx, flowtable);
7799
7800         if (flowtable->use > 0) {
7801                 NL_SET_BAD_ATTR(extack, attr);
7802                 return -EBUSY;
7803         }
7804
7805         return nft_delflowtable(&ctx, flowtable);
7806 }
7807
7808 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7809                                          u32 portid, u32 seq, int event,
7810                                          u32 flags, int family,
7811                                          struct nft_flowtable *flowtable,
7812                                          struct list_head *hook_list)
7813 {
7814         struct nlattr *nest, *nest_devs;
7815         struct nft_hook *hook;
7816         struct nlmsghdr *nlh;
7817
7818         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7819         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7820                            NFNETLINK_V0, nft_base_seq(net));
7821         if (!nlh)
7822                 goto nla_put_failure;
7823
7824         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7825             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7826             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7827             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7828                          NFTA_FLOWTABLE_PAD) ||
7829             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7830                 goto nla_put_failure;
7831
7832         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7833         if (!nest)
7834                 goto nla_put_failure;
7835         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7836             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7837                 goto nla_put_failure;
7838
7839         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7840         if (!nest_devs)
7841                 goto nla_put_failure;
7842
7843         list_for_each_entry_rcu(hook, hook_list, list) {
7844                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7845                         goto nla_put_failure;
7846         }
7847         nla_nest_end(skb, nest_devs);
7848         nla_nest_end(skb, nest);
7849
7850         nlmsg_end(skb, nlh);
7851         return 0;
7852
7853 nla_put_failure:
7854         nlmsg_trim(skb, nlh);
7855         return -1;
7856 }
7857
7858 struct nft_flowtable_filter {
7859         char            *table;
7860 };
7861
7862 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7863                                     struct netlink_callback *cb)
7864 {
7865         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7866         struct nft_flowtable_filter *filter = cb->data;
7867         unsigned int idx = 0, s_idx = cb->args[0];
7868         struct net *net = sock_net(skb->sk);
7869         int family = nfmsg->nfgen_family;
7870         struct nft_flowtable *flowtable;
7871         struct nftables_pernet *nft_net;
7872         const struct nft_table *table;
7873
7874         rcu_read_lock();
7875         nft_net = nft_pernet(net);
7876         cb->seq = nft_net->base_seq;
7877
7878         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7879                 if (family != NFPROTO_UNSPEC && family != table->family)
7880                         continue;
7881
7882                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7883                         if (!nft_is_active(net, flowtable))
7884                                 goto cont;
7885                         if (idx < s_idx)
7886                                 goto cont;
7887                         if (idx > s_idx)
7888                                 memset(&cb->args[1], 0,
7889                                        sizeof(cb->args) - sizeof(cb->args[0]));
7890                         if (filter && filter->table &&
7891                             strcmp(filter->table, table->name))
7892                                 goto cont;
7893
7894                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7895                                                           cb->nlh->nlmsg_seq,
7896                                                           NFT_MSG_NEWFLOWTABLE,
7897                                                           NLM_F_MULTI | NLM_F_APPEND,
7898                                                           table->family,
7899                                                           flowtable,
7900                                                           &flowtable->hook_list) < 0)
7901                                 goto done;
7902
7903                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7904 cont:
7905                         idx++;
7906                 }
7907         }
7908 done:
7909         rcu_read_unlock();
7910
7911         cb->args[0] = idx;
7912         return skb->len;
7913 }
7914
7915 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7916 {
7917         const struct nlattr * const *nla = cb->data;
7918         struct nft_flowtable_filter *filter = NULL;
7919
7920         if (nla[NFTA_FLOWTABLE_TABLE]) {
7921                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7922                 if (!filter)
7923                         return -ENOMEM;
7924
7925                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7926                                            GFP_ATOMIC);
7927                 if (!filter->table) {
7928                         kfree(filter);
7929                         return -ENOMEM;
7930                 }
7931         }
7932
7933         cb->data = filter;
7934         return 0;
7935 }
7936
7937 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7938 {
7939         struct nft_flowtable_filter *filter = cb->data;
7940
7941         if (!filter)
7942                 return 0;
7943
7944         kfree(filter->table);
7945         kfree(filter);
7946
7947         return 0;
7948 }
7949
7950 /* called with rcu_read_lock held */
7951 static int nf_tables_getflowtable(struct sk_buff *skb,
7952                                   const struct nfnl_info *info,
7953                                   const struct nlattr * const nla[])
7954 {
7955         u8 genmask = nft_genmask_cur(info->net);
7956         u8 family = info->nfmsg->nfgen_family;
7957         struct nft_flowtable *flowtable;
7958         const struct nft_table *table;
7959         struct net *net = info->net;
7960         struct sk_buff *skb2;
7961         int err;
7962
7963         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7964                 struct netlink_dump_control c = {
7965                         .start = nf_tables_dump_flowtable_start,
7966                         .dump = nf_tables_dump_flowtable,
7967                         .done = nf_tables_dump_flowtable_done,
7968                         .module = THIS_MODULE,
7969                         .data = (void *)nla,
7970                 };
7971
7972                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7973         }
7974
7975         if (!nla[NFTA_FLOWTABLE_NAME])
7976                 return -EINVAL;
7977
7978         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7979                                  genmask, 0);
7980         if (IS_ERR(table))
7981                 return PTR_ERR(table);
7982
7983         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7984                                          genmask);
7985         if (IS_ERR(flowtable))
7986                 return PTR_ERR(flowtable);
7987
7988         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7989         if (!skb2)
7990                 return -ENOMEM;
7991
7992         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7993                                             info->nlh->nlmsg_seq,
7994                                             NFT_MSG_NEWFLOWTABLE, 0, family,
7995                                             flowtable, &flowtable->hook_list);
7996         if (err < 0)
7997                 goto err_fill_flowtable_info;
7998
7999         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8000
8001 err_fill_flowtable_info:
8002         kfree_skb(skb2);
8003         return err;
8004 }
8005
8006 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8007                                        struct nft_flowtable *flowtable,
8008                                        struct list_head *hook_list,
8009                                        int event)
8010 {
8011         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8012         struct sk_buff *skb;
8013         u16 flags = 0;
8014         int err;
8015
8016         if (!ctx->report &&
8017             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8018                 return;
8019
8020         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8021         if (skb == NULL)
8022                 goto err;
8023
8024         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8025                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8026
8027         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8028                                             ctx->seq, event, flags,
8029                                             ctx->family, flowtable, hook_list);
8030         if (err < 0) {
8031                 kfree_skb(skb);
8032                 goto err;
8033         }
8034
8035         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8036         return;
8037 err:
8038         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8039 }
8040
8041 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8042 {
8043         struct nft_hook *hook, *next;
8044
8045         flowtable->data.type->free(&flowtable->data);
8046         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8047                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8048                                             FLOW_BLOCK_UNBIND);
8049                 list_del_rcu(&hook->list);
8050                 kfree(hook);
8051         }
8052         kfree(flowtable->name);
8053         module_put(flowtable->data.type->owner);
8054         kfree(flowtable);
8055 }
8056
8057 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8058                                    u32 portid, u32 seq)
8059 {
8060         struct nftables_pernet *nft_net = nft_pernet(net);
8061         struct nlmsghdr *nlh;
8062         char buf[TASK_COMM_LEN];
8063         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8064
8065         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8066                            NFNETLINK_V0, nft_base_seq(net));
8067         if (!nlh)
8068                 goto nla_put_failure;
8069
8070         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8071             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8072             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8073                 goto nla_put_failure;
8074
8075         nlmsg_end(skb, nlh);
8076         return 0;
8077
8078 nla_put_failure:
8079         nlmsg_trim(skb, nlh);
8080         return -EMSGSIZE;
8081 }
8082
8083 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8084                                 struct nft_flowtable *flowtable)
8085 {
8086         struct nft_hook *hook;
8087
8088         list_for_each_entry(hook, &flowtable->hook_list, list) {
8089                 if (hook->ops.dev != dev)
8090                         continue;
8091
8092                 /* flow_offload_netdev_event() cleans up entries for us. */
8093                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8094                 list_del_rcu(&hook->list);
8095                 kfree_rcu(hook, rcu);
8096                 break;
8097         }
8098 }
8099
8100 static int nf_tables_flowtable_event(struct notifier_block *this,
8101                                      unsigned long event, void *ptr)
8102 {
8103         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8104         struct nft_flowtable *flowtable;
8105         struct nftables_pernet *nft_net;
8106         struct nft_table *table;
8107         struct net *net;
8108
8109         if (event != NETDEV_UNREGISTER)
8110                 return 0;
8111
8112         net = dev_net(dev);
8113         nft_net = nft_pernet(net);
8114         mutex_lock(&nft_net->commit_mutex);
8115         list_for_each_entry(table, &nft_net->tables, list) {
8116                 list_for_each_entry(flowtable, &table->flowtables, list) {
8117                         nft_flowtable_event(event, dev, flowtable);
8118                 }
8119         }
8120         mutex_unlock(&nft_net->commit_mutex);
8121
8122         return NOTIFY_DONE;
8123 }
8124
8125 static struct notifier_block nf_tables_flowtable_notifier = {
8126         .notifier_call  = nf_tables_flowtable_event,
8127 };
8128
8129 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8130                                  int event)
8131 {
8132         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8133         struct sk_buff *skb2;
8134         int err;
8135
8136         if (!nlmsg_report(nlh) &&
8137             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8138                 return;
8139
8140         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8141         if (skb2 == NULL)
8142                 goto err;
8143
8144         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8145                                       nlh->nlmsg_seq);
8146         if (err < 0) {
8147                 kfree_skb(skb2);
8148                 goto err;
8149         }
8150
8151         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8152                        nlmsg_report(nlh), GFP_KERNEL);
8153         return;
8154 err:
8155         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8156                           -ENOBUFS);
8157 }
8158
8159 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8160                             const struct nlattr * const nla[])
8161 {
8162         struct sk_buff *skb2;
8163         int err;
8164
8165         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8166         if (skb2 == NULL)
8167                 return -ENOMEM;
8168
8169         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8170                                       info->nlh->nlmsg_seq);
8171         if (err < 0)
8172                 goto err_fill_gen_info;
8173
8174         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8175
8176 err_fill_gen_info:
8177         kfree_skb(skb2);
8178         return err;
8179 }
8180
8181 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8182         [NFT_MSG_NEWTABLE] = {
8183                 .call           = nf_tables_newtable,
8184                 .type           = NFNL_CB_BATCH,
8185                 .attr_count     = NFTA_TABLE_MAX,
8186                 .policy         = nft_table_policy,
8187         },
8188         [NFT_MSG_GETTABLE] = {
8189                 .call           = nf_tables_gettable,
8190                 .type           = NFNL_CB_RCU,
8191                 .attr_count     = NFTA_TABLE_MAX,
8192                 .policy         = nft_table_policy,
8193         },
8194         [NFT_MSG_DELTABLE] = {
8195                 .call           = nf_tables_deltable,
8196                 .type           = NFNL_CB_BATCH,
8197                 .attr_count     = NFTA_TABLE_MAX,
8198                 .policy         = nft_table_policy,
8199         },
8200         [NFT_MSG_NEWCHAIN] = {
8201                 .call           = nf_tables_newchain,
8202                 .type           = NFNL_CB_BATCH,
8203                 .attr_count     = NFTA_CHAIN_MAX,
8204                 .policy         = nft_chain_policy,
8205         },
8206         [NFT_MSG_GETCHAIN] = {
8207                 .call           = nf_tables_getchain,
8208                 .type           = NFNL_CB_RCU,
8209                 .attr_count     = NFTA_CHAIN_MAX,
8210                 .policy         = nft_chain_policy,
8211         },
8212         [NFT_MSG_DELCHAIN] = {
8213                 .call           = nf_tables_delchain,
8214                 .type           = NFNL_CB_BATCH,
8215                 .attr_count     = NFTA_CHAIN_MAX,
8216                 .policy         = nft_chain_policy,
8217         },
8218         [NFT_MSG_NEWRULE] = {
8219                 .call           = nf_tables_newrule,
8220                 .type           = NFNL_CB_BATCH,
8221                 .attr_count     = NFTA_RULE_MAX,
8222                 .policy         = nft_rule_policy,
8223         },
8224         [NFT_MSG_GETRULE] = {
8225                 .call           = nf_tables_getrule,
8226                 .type           = NFNL_CB_RCU,
8227                 .attr_count     = NFTA_RULE_MAX,
8228                 .policy         = nft_rule_policy,
8229         },
8230         [NFT_MSG_DELRULE] = {
8231                 .call           = nf_tables_delrule,
8232                 .type           = NFNL_CB_BATCH,
8233                 .attr_count     = NFTA_RULE_MAX,
8234                 .policy         = nft_rule_policy,
8235         },
8236         [NFT_MSG_NEWSET] = {
8237                 .call           = nf_tables_newset,
8238                 .type           = NFNL_CB_BATCH,
8239                 .attr_count     = NFTA_SET_MAX,
8240                 .policy         = nft_set_policy,
8241         },
8242         [NFT_MSG_GETSET] = {
8243                 .call           = nf_tables_getset,
8244                 .type           = NFNL_CB_RCU,
8245                 .attr_count     = NFTA_SET_MAX,
8246                 .policy         = nft_set_policy,
8247         },
8248         [NFT_MSG_DELSET] = {
8249                 .call           = nf_tables_delset,
8250                 .type           = NFNL_CB_BATCH,
8251                 .attr_count     = NFTA_SET_MAX,
8252                 .policy         = nft_set_policy,
8253         },
8254         [NFT_MSG_NEWSETELEM] = {
8255                 .call           = nf_tables_newsetelem,
8256                 .type           = NFNL_CB_BATCH,
8257                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8258                 .policy         = nft_set_elem_list_policy,
8259         },
8260         [NFT_MSG_GETSETELEM] = {
8261                 .call           = nf_tables_getsetelem,
8262                 .type           = NFNL_CB_RCU,
8263                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8264                 .policy         = nft_set_elem_list_policy,
8265         },
8266         [NFT_MSG_DELSETELEM] = {
8267                 .call           = nf_tables_delsetelem,
8268                 .type           = NFNL_CB_BATCH,
8269                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8270                 .policy         = nft_set_elem_list_policy,
8271         },
8272         [NFT_MSG_GETGEN] = {
8273                 .call           = nf_tables_getgen,
8274                 .type           = NFNL_CB_RCU,
8275         },
8276         [NFT_MSG_NEWOBJ] = {
8277                 .call           = nf_tables_newobj,
8278                 .type           = NFNL_CB_BATCH,
8279                 .attr_count     = NFTA_OBJ_MAX,
8280                 .policy         = nft_obj_policy,
8281         },
8282         [NFT_MSG_GETOBJ] = {
8283                 .call           = nf_tables_getobj,
8284                 .type           = NFNL_CB_RCU,
8285                 .attr_count     = NFTA_OBJ_MAX,
8286                 .policy         = nft_obj_policy,
8287         },
8288         [NFT_MSG_DELOBJ] = {
8289                 .call           = nf_tables_delobj,
8290                 .type           = NFNL_CB_BATCH,
8291                 .attr_count     = NFTA_OBJ_MAX,
8292                 .policy         = nft_obj_policy,
8293         },
8294         [NFT_MSG_GETOBJ_RESET] = {
8295                 .call           = nf_tables_getobj,
8296                 .type           = NFNL_CB_RCU,
8297                 .attr_count     = NFTA_OBJ_MAX,
8298                 .policy         = nft_obj_policy,
8299         },
8300         [NFT_MSG_NEWFLOWTABLE] = {
8301                 .call           = nf_tables_newflowtable,
8302                 .type           = NFNL_CB_BATCH,
8303                 .attr_count     = NFTA_FLOWTABLE_MAX,
8304                 .policy         = nft_flowtable_policy,
8305         },
8306         [NFT_MSG_GETFLOWTABLE] = {
8307                 .call           = nf_tables_getflowtable,
8308                 .type           = NFNL_CB_RCU,
8309                 .attr_count     = NFTA_FLOWTABLE_MAX,
8310                 .policy         = nft_flowtable_policy,
8311         },
8312         [NFT_MSG_DELFLOWTABLE] = {
8313                 .call           = nf_tables_delflowtable,
8314                 .type           = NFNL_CB_BATCH,
8315                 .attr_count     = NFTA_FLOWTABLE_MAX,
8316                 .policy         = nft_flowtable_policy,
8317         },
8318 };
8319
8320 static int nf_tables_validate(struct net *net)
8321 {
8322         struct nftables_pernet *nft_net = nft_pernet(net);
8323         struct nft_table *table;
8324
8325         switch (nft_net->validate_state) {
8326         case NFT_VALIDATE_SKIP:
8327                 break;
8328         case NFT_VALIDATE_NEED:
8329                 nft_validate_state_update(net, NFT_VALIDATE_DO);
8330                 fallthrough;
8331         case NFT_VALIDATE_DO:
8332                 list_for_each_entry(table, &nft_net->tables, list) {
8333                         if (nft_table_validate(net, table) < 0)
8334                                 return -EAGAIN;
8335                 }
8336                 break;
8337         }
8338
8339         return 0;
8340 }
8341
8342 /* a drop policy has to be deferred until all rules have been activated,
8343  * otherwise a large ruleset that contains a drop-policy base chain will
8344  * cause all packets to get dropped until the full transaction has been
8345  * processed.
8346  *
8347  * We defer the drop policy until the transaction has been finalized.
8348  */
8349 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8350 {
8351         struct nft_base_chain *basechain;
8352
8353         if (nft_trans_chain_policy(trans) != NF_DROP)
8354                 return;
8355
8356         if (!nft_is_base_chain(trans->ctx.chain))
8357                 return;
8358
8359         basechain = nft_base_chain(trans->ctx.chain);
8360         basechain->policy = NF_DROP;
8361 }
8362
8363 static void nft_chain_commit_update(struct nft_trans *trans)
8364 {
8365         struct nft_base_chain *basechain;
8366
8367         if (nft_trans_chain_name(trans)) {
8368                 rhltable_remove(&trans->ctx.table->chains_ht,
8369                                 &trans->ctx.chain->rhlhead,
8370                                 nft_chain_ht_params);
8371                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8372                 rhltable_insert_key(&trans->ctx.table->chains_ht,
8373                                     trans->ctx.chain->name,
8374                                     &trans->ctx.chain->rhlhead,
8375                                     nft_chain_ht_params);
8376         }
8377
8378         if (!nft_is_base_chain(trans->ctx.chain))
8379                 return;
8380
8381         nft_chain_stats_replace(trans);
8382
8383         basechain = nft_base_chain(trans->ctx.chain);
8384
8385         switch (nft_trans_chain_policy(trans)) {
8386         case NF_DROP:
8387         case NF_ACCEPT:
8388                 basechain->policy = nft_trans_chain_policy(trans);
8389                 break;
8390         }
8391 }
8392
8393 static void nft_obj_commit_update(struct nft_trans *trans)
8394 {
8395         struct nft_object *newobj;
8396         struct nft_object *obj;
8397
8398         obj = nft_trans_obj(trans);
8399         newobj = nft_trans_obj_newobj(trans);
8400
8401         if (obj->ops->update)
8402                 obj->ops->update(obj, newobj);
8403
8404         nft_obj_destroy(&trans->ctx, newobj);
8405 }
8406
8407 static void nft_commit_release(struct nft_trans *trans)
8408 {
8409         switch (trans->msg_type) {
8410         case NFT_MSG_DELTABLE:
8411                 nf_tables_table_destroy(&trans->ctx);
8412                 break;
8413         case NFT_MSG_NEWCHAIN:
8414                 free_percpu(nft_trans_chain_stats(trans));
8415                 kfree(nft_trans_chain_name(trans));
8416                 break;
8417         case NFT_MSG_DELCHAIN:
8418                 nf_tables_chain_destroy(&trans->ctx);
8419                 break;
8420         case NFT_MSG_DELRULE:
8421                 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8422                         nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8423
8424                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8425                 break;
8426         case NFT_MSG_DELSET:
8427                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8428                 break;
8429         case NFT_MSG_DELSETELEM:
8430                 nf_tables_set_elem_destroy(&trans->ctx,
8431                                            nft_trans_elem_set(trans),
8432                                            nft_trans_elem(trans).priv);
8433                 break;
8434         case NFT_MSG_DELOBJ:
8435                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8436                 break;
8437         case NFT_MSG_DELFLOWTABLE:
8438                 if (nft_trans_flowtable_update(trans))
8439                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8440                 else
8441                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8442                 break;
8443         }
8444
8445         if (trans->put_net)
8446                 put_net(trans->ctx.net);
8447
8448         kfree(trans);
8449 }
8450
8451 static void nf_tables_trans_destroy_work(struct work_struct *w)
8452 {
8453         struct nft_trans *trans, *next;
8454         LIST_HEAD(head);
8455
8456         spin_lock(&nf_tables_destroy_list_lock);
8457         list_splice_init(&nf_tables_destroy_list, &head);
8458         spin_unlock(&nf_tables_destroy_list_lock);
8459
8460         if (list_empty(&head))
8461                 return;
8462
8463         synchronize_rcu();
8464
8465         list_for_each_entry_safe(trans, next, &head, list) {
8466                 list_del(&trans->list);
8467                 nft_commit_release(trans);
8468         }
8469 }
8470
8471 void nf_tables_trans_destroy_flush_work(void)
8472 {
8473         flush_work(&trans_destroy_work);
8474 }
8475 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8476
8477 static bool nft_expr_reduce(struct nft_regs_track *track,
8478                             const struct nft_expr *expr)
8479 {
8480         return false;
8481 }
8482
8483 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8484 {
8485         const struct nft_expr *expr, *last;
8486         struct nft_regs_track track = {};
8487         unsigned int size, data_size;
8488         void *data, *data_boundary;
8489         struct nft_rule_dp *prule;
8490         struct nft_rule *rule;
8491
8492         /* already handled or inactive chain? */
8493         if (chain->blob_next || !nft_is_active_next(net, chain))
8494                 return 0;
8495
8496         data_size = 0;
8497         list_for_each_entry(rule, &chain->rules, list) {
8498                 if (nft_is_active_next(net, rule)) {
8499                         data_size += sizeof(*prule) + rule->dlen;
8500                         if (data_size > INT_MAX)
8501                                 return -ENOMEM;
8502                 }
8503         }
8504         data_size += offsetof(struct nft_rule_dp, data);        /* last rule */
8505
8506         chain->blob_next = nf_tables_chain_alloc_rules(data_size);
8507         if (!chain->blob_next)
8508                 return -ENOMEM;
8509
8510         data = (void *)chain->blob_next->data;
8511         data_boundary = data + data_size;
8512         size = 0;
8513
8514         list_for_each_entry(rule, &chain->rules, list) {
8515                 if (!nft_is_active_next(net, rule))
8516                         continue;
8517
8518                 prule = (struct nft_rule_dp *)data;
8519                 data += offsetof(struct nft_rule_dp, data);
8520                 if (WARN_ON_ONCE(data > data_boundary))
8521                         return -ENOMEM;
8522
8523                 size = 0;
8524                 track.last = nft_expr_last(rule);
8525                 nft_rule_for_each_expr(expr, last, rule) {
8526                         track.cur = expr;
8527
8528                         if (nft_expr_reduce(&track, expr)) {
8529                                 expr = track.cur;
8530                                 continue;
8531                         }
8532
8533                         if (WARN_ON_ONCE(data + expr->ops->size > data_boundary))
8534                                 return -ENOMEM;
8535
8536                         memcpy(data + size, expr, expr->ops->size);
8537                         size += expr->ops->size;
8538                 }
8539                 if (WARN_ON_ONCE(size >= 1 << 12))
8540                         return -ENOMEM;
8541
8542                 prule->handle = rule->handle;
8543                 prule->dlen = size;
8544                 prule->is_last = 0;
8545
8546                 data += size;
8547                 size = 0;
8548                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
8549         }
8550
8551         prule = (struct nft_rule_dp *)data;
8552         data += offsetof(struct nft_rule_dp, data);
8553         if (WARN_ON_ONCE(data > data_boundary))
8554                 return -ENOMEM;
8555
8556         nft_last_rule(chain->blob_next, prule);
8557
8558         return 0;
8559 }
8560
8561 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8562 {
8563         struct nftables_pernet *nft_net = nft_pernet(net);
8564         struct nft_trans *trans, *next;
8565
8566         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8567                 struct nft_chain *chain = trans->ctx.chain;
8568
8569                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8570                     trans->msg_type == NFT_MSG_DELRULE) {
8571                         kvfree(chain->blob_next);
8572                         chain->blob_next = NULL;
8573                 }
8574         }
8575 }
8576
8577 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8578 {
8579         struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8580
8581         kvfree(o->blob);
8582 }
8583
8584 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
8585 {
8586         struct nft_rules_old *old;
8587
8588         /* rcu_head is after end marker */
8589         old = (void *)blob + sizeof(*blob) + blob->size;
8590         old->blob = blob;
8591
8592         call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8593 }
8594
8595 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8596 {
8597         struct nft_rule_blob *g0, *g1;
8598         bool next_genbit;
8599
8600         next_genbit = nft_gencursor_next(net);
8601
8602         g0 = rcu_dereference_protected(chain->blob_gen_0,
8603                                        lockdep_commit_lock_is_held(net));
8604         g1 = rcu_dereference_protected(chain->blob_gen_1,
8605                                        lockdep_commit_lock_is_held(net));
8606
8607         /* No changes to this chain? */
8608         if (chain->blob_next == NULL) {
8609                 /* chain had no change in last or next generation */
8610                 if (g0 == g1)
8611                         return;
8612                 /*
8613                  * chain had no change in this generation; make sure next
8614                  * one uses same rules as current generation.
8615                  */
8616                 if (next_genbit) {
8617                         rcu_assign_pointer(chain->blob_gen_1, g0);
8618                         nf_tables_commit_chain_free_rules_old(g1);
8619                 } else {
8620                         rcu_assign_pointer(chain->blob_gen_0, g1);
8621                         nf_tables_commit_chain_free_rules_old(g0);
8622                 }
8623
8624                 return;
8625         }
8626
8627         if (next_genbit)
8628                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
8629         else
8630                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
8631
8632         chain->blob_next = NULL;
8633
8634         if (g0 == g1)
8635                 return;
8636
8637         if (next_genbit)
8638                 nf_tables_commit_chain_free_rules_old(g1);
8639         else
8640                 nf_tables_commit_chain_free_rules_old(g0);
8641 }
8642
8643 static void nft_obj_del(struct nft_object *obj)
8644 {
8645         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8646         list_del_rcu(&obj->list);
8647 }
8648
8649 void nft_chain_del(struct nft_chain *chain)
8650 {
8651         struct nft_table *table = chain->table;
8652
8653         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8654                                      nft_chain_ht_params));
8655         list_del_rcu(&chain->list);
8656 }
8657
8658 static void nf_tables_module_autoload_cleanup(struct net *net)
8659 {
8660         struct nftables_pernet *nft_net = nft_pernet(net);
8661         struct nft_module_request *req, *next;
8662
8663         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8664         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8665                 WARN_ON_ONCE(!req->done);
8666                 list_del(&req->list);
8667                 kfree(req);
8668         }
8669 }
8670
8671 static void nf_tables_commit_release(struct net *net)
8672 {
8673         struct nftables_pernet *nft_net = nft_pernet(net);
8674         struct nft_trans *trans;
8675
8676         /* all side effects have to be made visible.
8677          * For example, if a chain named 'foo' has been deleted, a
8678          * new transaction must not find it anymore.
8679          *
8680          * Memory reclaim happens asynchronously from work queue
8681          * to prevent expensive synchronize_rcu() in commit phase.
8682          */
8683         if (list_empty(&nft_net->commit_list)) {
8684                 nf_tables_module_autoload_cleanup(net);
8685                 mutex_unlock(&nft_net->commit_mutex);
8686                 return;
8687         }
8688
8689         trans = list_last_entry(&nft_net->commit_list,
8690                                 struct nft_trans, list);
8691         get_net(trans->ctx.net);
8692         WARN_ON_ONCE(trans->put_net);
8693
8694         trans->put_net = true;
8695         spin_lock(&nf_tables_destroy_list_lock);
8696         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
8697         spin_unlock(&nf_tables_destroy_list_lock);
8698
8699         nf_tables_module_autoload_cleanup(net);
8700         schedule_work(&trans_destroy_work);
8701
8702         mutex_unlock(&nft_net->commit_mutex);
8703 }
8704
8705 static void nft_commit_notify(struct net *net, u32 portid)
8706 {
8707         struct nftables_pernet *nft_net = nft_pernet(net);
8708         struct sk_buff *batch_skb = NULL, *nskb, *skb;
8709         unsigned char *data;
8710         int len;
8711
8712         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
8713                 if (!batch_skb) {
8714 new_batch:
8715                         batch_skb = skb;
8716                         len = NLMSG_GOODSIZE - skb->len;
8717                         list_del(&skb->list);
8718                         continue;
8719                 }
8720                 len -= skb->len;
8721                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8722                         data = skb_put(batch_skb, skb->len);
8723                         memcpy(data, skb->data, skb->len);
8724                         list_del(&skb->list);
8725                         kfree_skb(skb);
8726                         continue;
8727                 }
8728                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8729                                NFT_CB(batch_skb).report, GFP_KERNEL);
8730                 goto new_batch;
8731         }
8732
8733         if (batch_skb) {
8734                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8735                                NFT_CB(batch_skb).report, GFP_KERNEL);
8736         }
8737
8738         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
8739 }
8740
8741 static int nf_tables_commit_audit_alloc(struct list_head *adl,
8742                                         struct nft_table *table)
8743 {
8744         struct nft_audit_data *adp;
8745
8746         list_for_each_entry(adp, adl, list) {
8747                 if (adp->table == table)
8748                         return 0;
8749         }
8750         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
8751         if (!adp)
8752                 return -ENOMEM;
8753         adp->table = table;
8754         list_add(&adp->list, adl);
8755         return 0;
8756 }
8757
8758 static void nf_tables_commit_audit_free(struct list_head *adl)
8759 {
8760         struct nft_audit_data *adp, *adn;
8761
8762         list_for_each_entry_safe(adp, adn, adl, list) {
8763                 list_del(&adp->list);
8764                 kfree(adp);
8765         }
8766 }
8767
8768 static void nf_tables_commit_audit_collect(struct list_head *adl,
8769                                            struct nft_table *table, u32 op)
8770 {
8771         struct nft_audit_data *adp;
8772
8773         list_for_each_entry(adp, adl, list) {
8774                 if (adp->table == table)
8775                         goto found;
8776         }
8777         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
8778         return;
8779 found:
8780         adp->entries++;
8781         if (!adp->op || adp->op > op)
8782                 adp->op = op;
8783 }
8784
8785 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
8786
8787 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
8788 {
8789         struct nft_audit_data *adp, *adn;
8790         char aubuf[AUNFTABLENAMELEN];
8791
8792         list_for_each_entry_safe(adp, adn, adl, list) {
8793                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
8794                          generation);
8795                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
8796                                 nft2audit_op[adp->op], GFP_KERNEL);
8797                 list_del(&adp->list);
8798                 kfree(adp);
8799         }
8800 }
8801
8802 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8803 {
8804         struct nftables_pernet *nft_net = nft_pernet(net);
8805         struct nft_trans *trans, *next;
8806         struct nft_trans_elem *te;
8807         struct nft_chain *chain;
8808         struct nft_table *table;
8809         LIST_HEAD(adl);
8810         int err;
8811
8812         if (list_empty(&nft_net->commit_list)) {
8813                 mutex_unlock(&nft_net->commit_mutex);
8814                 return 0;
8815         }
8816
8817         /* 0. Validate ruleset, otherwise roll back for error reporting. */
8818         if (nf_tables_validate(net) < 0)
8819                 return -EAGAIN;
8820
8821         err = nft_flow_rule_offload_commit(net);
8822         if (err < 0)
8823                 return err;
8824
8825         /* 1.  Allocate space for next generation rules_gen_X[] */
8826         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8827                 int ret;
8828
8829                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
8830                 if (ret) {
8831                         nf_tables_commit_chain_prepare_cancel(net);
8832                         nf_tables_commit_audit_free(&adl);
8833                         return ret;
8834                 }
8835                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8836                     trans->msg_type == NFT_MSG_DELRULE) {
8837                         chain = trans->ctx.chain;
8838
8839                         ret = nf_tables_commit_chain_prepare(net, chain);
8840                         if (ret < 0) {
8841                                 nf_tables_commit_chain_prepare_cancel(net);
8842                                 nf_tables_commit_audit_free(&adl);
8843                                 return ret;
8844                         }
8845                 }
8846         }
8847
8848         /* step 2.  Make rules_gen_X visible to packet path */
8849         list_for_each_entry(table, &nft_net->tables, list) {
8850                 list_for_each_entry(chain, &table->chains, list)
8851                         nf_tables_commit_chain(net, chain);
8852         }
8853
8854         /*
8855          * Bump generation counter, invalidate any dump in progress.
8856          * Cannot fail after this point.
8857          */
8858         while (++nft_net->base_seq == 0)
8859                 ;
8860
8861         /* step 3. Start new generation, rules_gen_X now in use. */
8862         net->nft.gencursor = nft_gencursor_next(net);
8863
8864         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8865                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
8866                                                trans->msg_type);
8867                 switch (trans->msg_type) {
8868                 case NFT_MSG_NEWTABLE:
8869                         if (nft_trans_table_update(trans)) {
8870                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8871                                         nft_trans_destroy(trans);
8872                                         break;
8873                                 }
8874                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
8875                                         nf_tables_table_disable(net, trans->ctx.table);
8876
8877                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8878                         } else {
8879                                 nft_clear(net, trans->ctx.table);
8880                         }
8881                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8882                         nft_trans_destroy(trans);
8883                         break;
8884                 case NFT_MSG_DELTABLE:
8885                         list_del_rcu(&trans->ctx.table->list);
8886                         nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8887                         break;
8888                 case NFT_MSG_NEWCHAIN:
8889                         if (nft_trans_chain_update(trans)) {
8890                                 nft_chain_commit_update(trans);
8891                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8892                                 /* trans destroyed after rcu grace period */
8893                         } else {
8894                                 nft_chain_commit_drop_policy(trans);
8895                                 nft_clear(net, trans->ctx.chain);
8896                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8897                                 nft_trans_destroy(trans);
8898                         }
8899                         break;
8900                 case NFT_MSG_DELCHAIN:
8901                         nft_chain_del(trans->ctx.chain);
8902                         nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8903                         nf_tables_unregister_hook(trans->ctx.net,
8904                                                   trans->ctx.table,
8905                                                   trans->ctx.chain);
8906                         break;
8907                 case NFT_MSG_NEWRULE:
8908                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8909                         nf_tables_rule_notify(&trans->ctx,
8910                                               nft_trans_rule(trans),
8911                                               NFT_MSG_NEWRULE);
8912                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8913                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8914
8915                         nft_trans_destroy(trans);
8916                         break;
8917                 case NFT_MSG_DELRULE:
8918                         list_del_rcu(&nft_trans_rule(trans)->list);
8919                         nf_tables_rule_notify(&trans->ctx,
8920                                               nft_trans_rule(trans),
8921                                               NFT_MSG_DELRULE);
8922                         nft_rule_expr_deactivate(&trans->ctx,
8923                                                  nft_trans_rule(trans),
8924                                                  NFT_TRANS_COMMIT);
8925                         break;
8926                 case NFT_MSG_NEWSET:
8927                         nft_clear(net, nft_trans_set(trans));
8928                         /* This avoids hitting -EBUSY when deleting the table
8929                          * from the transaction.
8930                          */
8931                         if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8932                             !list_empty(&nft_trans_set(trans)->bindings))
8933                                 trans->ctx.table->use--;
8934
8935                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8936                                              NFT_MSG_NEWSET, GFP_KERNEL);
8937                         nft_trans_destroy(trans);
8938                         break;
8939                 case NFT_MSG_DELSET:
8940                         list_del_rcu(&nft_trans_set(trans)->list);
8941                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8942                                              NFT_MSG_DELSET, GFP_KERNEL);
8943                         break;
8944                 case NFT_MSG_NEWSETELEM:
8945                         te = (struct nft_trans_elem *)trans->data;
8946
8947                         nft_setelem_activate(net, te->set, &te->elem);
8948                         nf_tables_setelem_notify(&trans->ctx, te->set,
8949                                                  &te->elem,
8950                                                  NFT_MSG_NEWSETELEM);
8951                         nft_trans_destroy(trans);
8952                         break;
8953                 case NFT_MSG_DELSETELEM:
8954                         te = (struct nft_trans_elem *)trans->data;
8955
8956                         nf_tables_setelem_notify(&trans->ctx, te->set,
8957                                                  &te->elem,
8958                                                  NFT_MSG_DELSETELEM);
8959                         nft_setelem_remove(net, te->set, &te->elem);
8960                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
8961                                 atomic_dec(&te->set->nelems);
8962                                 te->set->ndeact--;
8963                         }
8964                         break;
8965                 case NFT_MSG_NEWOBJ:
8966                         if (nft_trans_obj_update(trans)) {
8967                                 nft_obj_commit_update(trans);
8968                                 nf_tables_obj_notify(&trans->ctx,
8969                                                      nft_trans_obj(trans),
8970                                                      NFT_MSG_NEWOBJ);
8971                         } else {
8972                                 nft_clear(net, nft_trans_obj(trans));
8973                                 nf_tables_obj_notify(&trans->ctx,
8974                                                      nft_trans_obj(trans),
8975                                                      NFT_MSG_NEWOBJ);
8976                                 nft_trans_destroy(trans);
8977                         }
8978                         break;
8979                 case NFT_MSG_DELOBJ:
8980                         nft_obj_del(nft_trans_obj(trans));
8981                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8982                                              NFT_MSG_DELOBJ);
8983                         break;
8984                 case NFT_MSG_NEWFLOWTABLE:
8985                         if (nft_trans_flowtable_update(trans)) {
8986                                 nft_trans_flowtable(trans)->data.flags =
8987                                         nft_trans_flowtable_flags(trans);
8988                                 nf_tables_flowtable_notify(&trans->ctx,
8989                                                            nft_trans_flowtable(trans),
8990                                                            &nft_trans_flowtable_hooks(trans),
8991                                                            NFT_MSG_NEWFLOWTABLE);
8992                                 list_splice(&nft_trans_flowtable_hooks(trans),
8993                                             &nft_trans_flowtable(trans)->hook_list);
8994                         } else {
8995                                 nft_clear(net, nft_trans_flowtable(trans));
8996                                 nf_tables_flowtable_notify(&trans->ctx,
8997                                                            nft_trans_flowtable(trans),
8998                                                            &nft_trans_flowtable(trans)->hook_list,
8999                                                            NFT_MSG_NEWFLOWTABLE);
9000                         }
9001                         nft_trans_destroy(trans);
9002                         break;
9003                 case NFT_MSG_DELFLOWTABLE:
9004                         if (nft_trans_flowtable_update(trans)) {
9005                                 nf_tables_flowtable_notify(&trans->ctx,
9006                                                            nft_trans_flowtable(trans),
9007                                                            &nft_trans_flowtable_hooks(trans),
9008                                                            NFT_MSG_DELFLOWTABLE);
9009                                 nft_unregister_flowtable_net_hooks(net,
9010                                                                    &nft_trans_flowtable_hooks(trans));
9011                         } else {
9012                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9013                                 nf_tables_flowtable_notify(&trans->ctx,
9014                                                            nft_trans_flowtable(trans),
9015                                                            &nft_trans_flowtable(trans)->hook_list,
9016                                                            NFT_MSG_DELFLOWTABLE);
9017                                 nft_unregister_flowtable_net_hooks(net,
9018                                                 &nft_trans_flowtable(trans)->hook_list);
9019                         }
9020                         break;
9021                 }
9022         }
9023
9024         nft_commit_notify(net, NETLINK_CB(skb).portid);
9025         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
9026         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
9027         nf_tables_commit_release(net);
9028
9029         return 0;
9030 }
9031
9032 static void nf_tables_module_autoload(struct net *net)
9033 {
9034         struct nftables_pernet *nft_net = nft_pernet(net);
9035         struct nft_module_request *req, *next;
9036         LIST_HEAD(module_list);
9037
9038         list_splice_init(&nft_net->module_list, &module_list);
9039         mutex_unlock(&nft_net->commit_mutex);
9040         list_for_each_entry_safe(req, next, &module_list, list) {
9041                 request_module("%s", req->module);
9042                 req->done = true;
9043         }
9044         mutex_lock(&nft_net->commit_mutex);
9045         list_splice(&module_list, &nft_net->module_list);
9046 }
9047
9048 static void nf_tables_abort_release(struct nft_trans *trans)
9049 {
9050         switch (trans->msg_type) {
9051         case NFT_MSG_NEWTABLE:
9052                 nf_tables_table_destroy(&trans->ctx);
9053                 break;
9054         case NFT_MSG_NEWCHAIN:
9055                 nf_tables_chain_destroy(&trans->ctx);
9056                 break;
9057         case NFT_MSG_NEWRULE:
9058                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9059                 break;
9060         case NFT_MSG_NEWSET:
9061                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9062                 break;
9063         case NFT_MSG_NEWSETELEM:
9064                 nft_set_elem_destroy(nft_trans_elem_set(trans),
9065                                      nft_trans_elem(trans).priv, true);
9066                 break;
9067         case NFT_MSG_NEWOBJ:
9068                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9069                 break;
9070         case NFT_MSG_NEWFLOWTABLE:
9071                 if (nft_trans_flowtable_update(trans))
9072                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9073                 else
9074                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9075                 break;
9076         }
9077         kfree(trans);
9078 }
9079
9080 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9081 {
9082         struct nftables_pernet *nft_net = nft_pernet(net);
9083         struct nft_trans *trans, *next;
9084         struct nft_trans_elem *te;
9085
9086         if (action == NFNL_ABORT_VALIDATE &&
9087             nf_tables_validate(net) < 0)
9088                 return -EAGAIN;
9089
9090         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9091                                          list) {
9092                 switch (trans->msg_type) {
9093                 case NFT_MSG_NEWTABLE:
9094                         if (nft_trans_table_update(trans)) {
9095                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9096                                         nft_trans_destroy(trans);
9097                                         break;
9098                                 }
9099                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9100                                         nf_tables_table_disable(net, trans->ctx.table);
9101                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9102                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9103                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9104                                 }
9105                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9106                                 nft_trans_destroy(trans);
9107                         } else {
9108                                 list_del_rcu(&trans->ctx.table->list);
9109                         }
9110                         break;
9111                 case NFT_MSG_DELTABLE:
9112                         nft_clear(trans->ctx.net, trans->ctx.table);
9113                         nft_trans_destroy(trans);
9114                         break;
9115                 case NFT_MSG_NEWCHAIN:
9116                         if (nft_trans_chain_update(trans)) {
9117                                 free_percpu(nft_trans_chain_stats(trans));
9118                                 kfree(nft_trans_chain_name(trans));
9119                                 nft_trans_destroy(trans);
9120                         } else {
9121                                 if (nft_chain_is_bound(trans->ctx.chain)) {
9122                                         nft_trans_destroy(trans);
9123                                         break;
9124                                 }
9125                                 trans->ctx.table->use--;
9126                                 nft_chain_del(trans->ctx.chain);
9127                                 nf_tables_unregister_hook(trans->ctx.net,
9128                                                           trans->ctx.table,
9129                                                           trans->ctx.chain);
9130                         }
9131                         break;
9132                 case NFT_MSG_DELCHAIN:
9133                         trans->ctx.table->use++;
9134                         nft_clear(trans->ctx.net, trans->ctx.chain);
9135                         nft_trans_destroy(trans);
9136                         break;
9137                 case NFT_MSG_NEWRULE:
9138                         trans->ctx.chain->use--;
9139                         list_del_rcu(&nft_trans_rule(trans)->list);
9140                         nft_rule_expr_deactivate(&trans->ctx,
9141                                                  nft_trans_rule(trans),
9142                                                  NFT_TRANS_ABORT);
9143                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9144                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9145                         break;
9146                 case NFT_MSG_DELRULE:
9147                         trans->ctx.chain->use++;
9148                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9149                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9150                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9151                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9152
9153                         nft_trans_destroy(trans);
9154                         break;
9155                 case NFT_MSG_NEWSET:
9156                         trans->ctx.table->use--;
9157                         if (nft_trans_set_bound(trans)) {
9158                                 nft_trans_destroy(trans);
9159                                 break;
9160                         }
9161                         list_del_rcu(&nft_trans_set(trans)->list);
9162                         break;
9163                 case NFT_MSG_DELSET:
9164                         trans->ctx.table->use++;
9165                         nft_clear(trans->ctx.net, nft_trans_set(trans));
9166                         nft_trans_destroy(trans);
9167                         break;
9168                 case NFT_MSG_NEWSETELEM:
9169                         if (nft_trans_elem_set_bound(trans)) {
9170                                 nft_trans_destroy(trans);
9171                                 break;
9172                         }
9173                         te = (struct nft_trans_elem *)trans->data;
9174                         nft_setelem_remove(net, te->set, &te->elem);
9175                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9176                                 atomic_dec(&te->set->nelems);
9177                         break;
9178                 case NFT_MSG_DELSETELEM:
9179                         te = (struct nft_trans_elem *)trans->data;
9180
9181                         nft_setelem_data_activate(net, te->set, &te->elem);
9182                         nft_setelem_activate(net, te->set, &te->elem);
9183                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9184                                 te->set->ndeact--;
9185
9186                         nft_trans_destroy(trans);
9187                         break;
9188                 case NFT_MSG_NEWOBJ:
9189                         if (nft_trans_obj_update(trans)) {
9190                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9191                                 nft_trans_destroy(trans);
9192                         } else {
9193                                 trans->ctx.table->use--;
9194                                 nft_obj_del(nft_trans_obj(trans));
9195                         }
9196                         break;
9197                 case NFT_MSG_DELOBJ:
9198                         trans->ctx.table->use++;
9199                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
9200                         nft_trans_destroy(trans);
9201                         break;
9202                 case NFT_MSG_NEWFLOWTABLE:
9203                         if (nft_trans_flowtable_update(trans)) {
9204                                 nft_unregister_flowtable_net_hooks(net,
9205                                                 &nft_trans_flowtable_hooks(trans));
9206                         } else {
9207                                 trans->ctx.table->use--;
9208                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9209                                 nft_unregister_flowtable_net_hooks(net,
9210                                                 &nft_trans_flowtable(trans)->hook_list);
9211                         }
9212                         break;
9213                 case NFT_MSG_DELFLOWTABLE:
9214                         if (nft_trans_flowtable_update(trans)) {
9215                                 list_splice(&nft_trans_flowtable_hooks(trans),
9216                                             &nft_trans_flowtable(trans)->hook_list);
9217                         } else {
9218                                 trans->ctx.table->use++;
9219                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9220                         }
9221                         nft_trans_destroy(trans);
9222                         break;
9223                 }
9224         }
9225
9226         synchronize_rcu();
9227
9228         list_for_each_entry_safe_reverse(trans, next,
9229                                          &nft_net->commit_list, list) {
9230                 list_del(&trans->list);
9231                 nf_tables_abort_release(trans);
9232         }
9233
9234         if (action == NFNL_ABORT_AUTOLOAD)
9235                 nf_tables_module_autoload(net);
9236         else
9237                 nf_tables_module_autoload_cleanup(net);
9238
9239         return 0;
9240 }
9241
9242 static void nf_tables_cleanup(struct net *net)
9243 {
9244         nft_validate_state_update(net, NFT_VALIDATE_SKIP);
9245 }
9246
9247 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9248                            enum nfnl_abort_action action)
9249 {
9250         struct nftables_pernet *nft_net = nft_pernet(net);
9251         int ret = __nf_tables_abort(net, action);
9252
9253         mutex_unlock(&nft_net->commit_mutex);
9254
9255         return ret;
9256 }
9257
9258 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9259 {
9260         struct nftables_pernet *nft_net = nft_pernet(net);
9261         bool genid_ok;
9262
9263         mutex_lock(&nft_net->commit_mutex);
9264
9265         genid_ok = genid == 0 || nft_net->base_seq == genid;
9266         if (!genid_ok)
9267                 mutex_unlock(&nft_net->commit_mutex);
9268
9269         /* else, commit mutex has to be released by commit or abort function */
9270         return genid_ok;
9271 }
9272
9273 static const struct nfnetlink_subsystem nf_tables_subsys = {
9274         .name           = "nf_tables",
9275         .subsys_id      = NFNL_SUBSYS_NFTABLES,
9276         .cb_count       = NFT_MSG_MAX,
9277         .cb             = nf_tables_cb,
9278         .commit         = nf_tables_commit,
9279         .abort          = nf_tables_abort,
9280         .cleanup        = nf_tables_cleanup,
9281         .valid_genid    = nf_tables_valid_genid,
9282         .owner          = THIS_MODULE,
9283 };
9284
9285 int nft_chain_validate_dependency(const struct nft_chain *chain,
9286                                   enum nft_chain_types type)
9287 {
9288         const struct nft_base_chain *basechain;
9289
9290         if (nft_is_base_chain(chain)) {
9291                 basechain = nft_base_chain(chain);
9292                 if (basechain->type->type != type)
9293                         return -EOPNOTSUPP;
9294         }
9295         return 0;
9296 }
9297 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9298
9299 int nft_chain_validate_hooks(const struct nft_chain *chain,
9300                              unsigned int hook_flags)
9301 {
9302         struct nft_base_chain *basechain;
9303
9304         if (nft_is_base_chain(chain)) {
9305                 basechain = nft_base_chain(chain);
9306
9307                 if ((1 << basechain->ops.hooknum) & hook_flags)
9308                         return 0;
9309
9310                 return -EOPNOTSUPP;
9311         }
9312
9313         return 0;
9314 }
9315 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9316
9317 /*
9318  * Loop detection - walk through the ruleset beginning at the destination chain
9319  * of a new jump until either the source chain is reached (loop) or all
9320  * reachable chains have been traversed.
9321  *
9322  * The loop check is performed whenever a new jump verdict is added to an
9323  * expression or verdict map or a verdict map is bound to a new chain.
9324  */
9325
9326 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9327                                  const struct nft_chain *chain);
9328
9329 static int nft_check_loops(const struct nft_ctx *ctx,
9330                            const struct nft_set_ext *ext)
9331 {
9332         const struct nft_data *data;
9333         int ret;
9334
9335         data = nft_set_ext_data(ext);
9336         switch (data->verdict.code) {
9337         case NFT_JUMP:
9338         case NFT_GOTO:
9339                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9340                 break;
9341         default:
9342                 ret = 0;
9343                 break;
9344         }
9345
9346         return ret;
9347 }
9348
9349 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9350                                         struct nft_set *set,
9351                                         const struct nft_set_iter *iter,
9352                                         struct nft_set_elem *elem)
9353 {
9354         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9355
9356         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9357             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9358                 return 0;
9359
9360         return nft_check_loops(ctx, ext);
9361 }
9362
9363 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9364                                   struct nft_set *set)
9365 {
9366         u8 genmask = nft_genmask_next(ctx->net);
9367         struct nft_set_elem_catchall *catchall;
9368         struct nft_set_ext *ext;
9369         int ret = 0;
9370
9371         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9372                 ext = nft_set_elem_ext(set, catchall->elem);
9373                 if (!nft_set_elem_active(ext, genmask))
9374                         continue;
9375
9376                 ret = nft_check_loops(ctx, ext);
9377                 if (ret < 0)
9378                         return ret;
9379         }
9380
9381         return ret;
9382 }
9383
9384 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9385                                  const struct nft_chain *chain)
9386 {
9387         const struct nft_rule *rule;
9388         const struct nft_expr *expr, *last;
9389         struct nft_set *set;
9390         struct nft_set_binding *binding;
9391         struct nft_set_iter iter;
9392
9393         if (ctx->chain == chain)
9394                 return -ELOOP;
9395
9396         list_for_each_entry(rule, &chain->rules, list) {
9397                 nft_rule_for_each_expr(expr, last, rule) {
9398                         struct nft_immediate_expr *priv;
9399                         const struct nft_data *data;
9400                         int err;
9401
9402                         if (strcmp(expr->ops->type->name, "immediate"))
9403                                 continue;
9404
9405                         priv = nft_expr_priv(expr);
9406                         if (priv->dreg != NFT_REG_VERDICT)
9407                                 continue;
9408
9409                         data = &priv->data;
9410                         switch (data->verdict.code) {
9411                         case NFT_JUMP:
9412                         case NFT_GOTO:
9413                                 err = nf_tables_check_loops(ctx,
9414                                                         data->verdict.chain);
9415                                 if (err < 0)
9416                                         return err;
9417                                 break;
9418                         default:
9419                                 break;
9420                         }
9421                 }
9422
9423                 cond_resched();
9424         }
9425
9426         list_for_each_entry(set, &ctx->table->sets, list) {
9427                 cond_resched();
9428
9429                 if (!nft_is_active_next(ctx->net, set))
9430                         continue;
9431                 if (!(set->flags & NFT_SET_MAP) ||
9432                     set->dtype != NFT_DATA_VERDICT)
9433                         continue;
9434
9435                 list_for_each_entry(binding, &set->bindings, list) {
9436                         if (!(binding->flags & NFT_SET_MAP) ||
9437                             binding->chain != chain)
9438                                 continue;
9439
9440                         iter.genmask    = nft_genmask_next(ctx->net);
9441                         iter.skip       = 0;
9442                         iter.count      = 0;
9443                         iter.err        = 0;
9444                         iter.fn         = nf_tables_loop_check_setelem;
9445
9446                         set->ops->walk(ctx, set, &iter);
9447                         if (!iter.err)
9448                                 iter.err = nft_set_catchall_loops(ctx, set);
9449
9450                         if (iter.err < 0)
9451                                 return iter.err;
9452                 }
9453         }
9454
9455         return 0;
9456 }
9457
9458 /**
9459  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
9460  *
9461  *      @attr: netlink attribute to fetch value from
9462  *      @max: maximum value to be stored in dest
9463  *      @dest: pointer to the variable
9464  *
9465  *      Parse, check and store a given u32 netlink attribute into variable.
9466  *      This function returns -ERANGE if the value goes over maximum value.
9467  *      Otherwise a 0 is returned and the attribute value is stored in the
9468  *      destination variable.
9469  */
9470 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9471 {
9472         u32 val;
9473
9474         val = ntohl(nla_get_be32(attr));
9475         if (val > max)
9476                 return -ERANGE;
9477
9478         *dest = val;
9479         return 0;
9480 }
9481 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9482
9483 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
9484 {
9485         unsigned int reg;
9486
9487         reg = ntohl(nla_get_be32(attr));
9488         switch (reg) {
9489         case NFT_REG_VERDICT...NFT_REG_4:
9490                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9491                 break;
9492         case NFT_REG32_00...NFT_REG32_15:
9493                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9494                 break;
9495         default:
9496                 return -ERANGE;
9497         }
9498
9499         return 0;
9500 }
9501
9502 /**
9503  *      nft_dump_register - dump a register value to a netlink attribute
9504  *
9505  *      @skb: socket buffer
9506  *      @attr: attribute number
9507  *      @reg: register number
9508  *
9509  *      Construct a netlink attribute containing the register number. For
9510  *      compatibility reasons, register numbers being a multiple of 4 are
9511  *      translated to the corresponding 128 bit register numbers.
9512  */
9513 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9514 {
9515         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9516                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9517         else
9518                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9519
9520         return nla_put_be32(skb, attr, htonl(reg));
9521 }
9522 EXPORT_SYMBOL_GPL(nft_dump_register);
9523
9524 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9525 {
9526         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9527                 return -EINVAL;
9528         if (len == 0)
9529                 return -EINVAL;
9530         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9531                 return -ERANGE;
9532
9533         return 0;
9534 }
9535
9536 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9537 {
9538         u32 reg;
9539         int err;
9540
9541         err = nft_parse_register(attr, &reg);
9542         if (err < 0)
9543                 return err;
9544
9545         err = nft_validate_register_load(reg, len);
9546         if (err < 0)
9547                 return err;
9548
9549         *sreg = reg;
9550         return 0;
9551 }
9552 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9553
9554 static int nft_validate_register_store(const struct nft_ctx *ctx,
9555                                        enum nft_registers reg,
9556                                        const struct nft_data *data,
9557                                        enum nft_data_types type,
9558                                        unsigned int len)
9559 {
9560         int err;
9561
9562         switch (reg) {
9563         case NFT_REG_VERDICT:
9564                 if (type != NFT_DATA_VERDICT)
9565                         return -EINVAL;
9566
9567                 if (data != NULL &&
9568                     (data->verdict.code == NFT_GOTO ||
9569                      data->verdict.code == NFT_JUMP)) {
9570                         err = nf_tables_check_loops(ctx, data->verdict.chain);
9571                         if (err < 0)
9572                                 return err;
9573                 }
9574
9575                 return 0;
9576         default:
9577                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9578                         return -EINVAL;
9579                 if (len == 0)
9580                         return -EINVAL;
9581                 if (reg * NFT_REG32_SIZE + len >
9582                     sizeof_field(struct nft_regs, data))
9583                         return -ERANGE;
9584
9585                 if (data != NULL && type != NFT_DATA_VALUE)
9586                         return -EINVAL;
9587                 return 0;
9588         }
9589 }
9590
9591 int nft_parse_register_store(const struct nft_ctx *ctx,
9592                              const struct nlattr *attr, u8 *dreg,
9593                              const struct nft_data *data,
9594                              enum nft_data_types type, unsigned int len)
9595 {
9596         int err;
9597         u32 reg;
9598
9599         err = nft_parse_register(attr, &reg);
9600         if (err < 0)
9601                 return err;
9602
9603         err = nft_validate_register_store(ctx, reg, data, type, len);
9604         if (err < 0)
9605                 return err;
9606
9607         *dreg = reg;
9608         return 0;
9609 }
9610 EXPORT_SYMBOL_GPL(nft_parse_register_store);
9611
9612 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9613         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
9614         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
9615                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
9616         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9617 };
9618
9619 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9620                             struct nft_data_desc *desc, const struct nlattr *nla)
9621 {
9622         u8 genmask = nft_genmask_next(ctx->net);
9623         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9624         struct nft_chain *chain;
9625         int err;
9626
9627         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9628                                           nft_verdict_policy, NULL);
9629         if (err < 0)
9630                 return err;
9631
9632         if (!tb[NFTA_VERDICT_CODE])
9633                 return -EINVAL;
9634         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9635
9636         switch (data->verdict.code) {
9637         default:
9638                 switch (data->verdict.code & NF_VERDICT_MASK) {
9639                 case NF_ACCEPT:
9640                 case NF_DROP:
9641                 case NF_QUEUE:
9642                         break;
9643                 default:
9644                         return -EINVAL;
9645                 }
9646                 fallthrough;
9647         case NFT_CONTINUE:
9648         case NFT_BREAK:
9649         case NFT_RETURN:
9650                 break;
9651         case NFT_JUMP:
9652         case NFT_GOTO:
9653                 if (tb[NFTA_VERDICT_CHAIN]) {
9654                         chain = nft_chain_lookup(ctx->net, ctx->table,
9655                                                  tb[NFTA_VERDICT_CHAIN],
9656                                                  genmask);
9657                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9658                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
9659                                                       tb[NFTA_VERDICT_CHAIN_ID]);
9660                         if (IS_ERR(chain))
9661                                 return PTR_ERR(chain);
9662                 } else {
9663                         return -EINVAL;
9664                 }
9665
9666                 if (IS_ERR(chain))
9667                         return PTR_ERR(chain);
9668                 if (nft_is_base_chain(chain))
9669                         return -EOPNOTSUPP;
9670                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
9671                     chain->flags & NFT_CHAIN_BINDING)
9672                         return -EINVAL;
9673
9674                 chain->use++;
9675                 data->verdict.chain = chain;
9676                 break;
9677         }
9678
9679         desc->len = sizeof(data->verdict);
9680
9681         return 0;
9682 }
9683
9684 static void nft_verdict_uninit(const struct nft_data *data)
9685 {
9686         struct nft_chain *chain;
9687         struct nft_rule *rule;
9688
9689         switch (data->verdict.code) {
9690         case NFT_JUMP:
9691         case NFT_GOTO:
9692                 chain = data->verdict.chain;
9693                 chain->use--;
9694
9695                 if (!nft_chain_is_bound(chain))
9696                         break;
9697
9698                 chain->table->use--;
9699                 list_for_each_entry(rule, &chain->rules, list)
9700                         chain->use--;
9701
9702                 nft_chain_del(chain);
9703                 break;
9704         }
9705 }
9706
9707 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
9708 {
9709         struct nlattr *nest;
9710
9711         nest = nla_nest_start_noflag(skb, type);
9712         if (!nest)
9713                 goto nla_put_failure;
9714
9715         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
9716                 goto nla_put_failure;
9717
9718         switch (v->code) {
9719         case NFT_JUMP:
9720         case NFT_GOTO:
9721                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
9722                                    v->chain->name))
9723                         goto nla_put_failure;
9724         }
9725         nla_nest_end(skb, nest);
9726         return 0;
9727
9728 nla_put_failure:
9729         return -1;
9730 }
9731
9732 static int nft_value_init(const struct nft_ctx *ctx,
9733                           struct nft_data *data, struct nft_data_desc *desc,
9734                           const struct nlattr *nla)
9735 {
9736         unsigned int len;
9737
9738         len = nla_len(nla);
9739         if (len == 0)
9740                 return -EINVAL;
9741         if (len > desc->size)
9742                 return -EOVERFLOW;
9743         if (desc->len) {
9744                 if (len != desc->len)
9745                         return -EINVAL;
9746         } else {
9747                 desc->len = len;
9748         }
9749
9750         nla_memcpy(data->data, nla, len);
9751
9752         return 0;
9753 }
9754
9755 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
9756                           unsigned int len)
9757 {
9758         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
9759 }
9760
9761 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
9762         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
9763         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
9764 };
9765
9766 /**
9767  *      nft_data_init - parse nf_tables data netlink attributes
9768  *
9769  *      @ctx: context of the expression using the data
9770  *      @data: destination struct nft_data
9771  *      @desc: data description
9772  *      @nla: netlink attribute containing data
9773  *
9774  *      Parse the netlink data attributes and initialize a struct nft_data.
9775  *      The type and length of data are returned in the data description.
9776  *
9777  *      The caller can indicate that it only wants to accept data of type
9778  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
9779  */
9780 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
9781                   struct nft_data_desc *desc, const struct nlattr *nla)
9782 {
9783         struct nlattr *tb[NFTA_DATA_MAX + 1];
9784         int err;
9785
9786         if (WARN_ON_ONCE(!desc->size))
9787                 return -EINVAL;
9788
9789         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
9790                                           nft_data_policy, NULL);
9791         if (err < 0)
9792                 return err;
9793
9794         if (tb[NFTA_DATA_VALUE]) {
9795                 if (desc->type != NFT_DATA_VALUE)
9796                         return -EINVAL;
9797
9798                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
9799         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
9800                 if (desc->type != NFT_DATA_VERDICT)
9801                         return -EINVAL;
9802
9803                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
9804         } else {
9805                 err = -EINVAL;
9806         }
9807
9808         return err;
9809 }
9810 EXPORT_SYMBOL_GPL(nft_data_init);
9811
9812 /**
9813  *      nft_data_release - release a nft_data item
9814  *
9815  *      @data: struct nft_data to release
9816  *      @type: type of data
9817  *
9818  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
9819  *      all others need to be released by calling this function.
9820  */
9821 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
9822 {
9823         if (type < NFT_DATA_VERDICT)
9824                 return;
9825         switch (type) {
9826         case NFT_DATA_VERDICT:
9827                 return nft_verdict_uninit(data);
9828         default:
9829                 WARN_ON(1);
9830         }
9831 }
9832 EXPORT_SYMBOL_GPL(nft_data_release);
9833
9834 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9835                   enum nft_data_types type, unsigned int len)
9836 {
9837         struct nlattr *nest;
9838         int err;
9839
9840         nest = nla_nest_start_noflag(skb, attr);
9841         if (nest == NULL)
9842                 return -1;
9843
9844         switch (type) {
9845         case NFT_DATA_VALUE:
9846                 err = nft_value_dump(skb, data, len);
9847                 break;
9848         case NFT_DATA_VERDICT:
9849                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
9850                 break;
9851         default:
9852                 err = -EINVAL;
9853                 WARN_ON(1);
9854         }
9855
9856         nla_nest_end(skb, nest);
9857         return err;
9858 }
9859 EXPORT_SYMBOL_GPL(nft_data_dump);
9860
9861 int __nft_release_basechain(struct nft_ctx *ctx)
9862 {
9863         struct nft_rule *rule, *nr;
9864
9865         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9866                 return 0;
9867
9868         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
9869         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9870                 list_del(&rule->list);
9871                 ctx->chain->use--;
9872                 nf_tables_rule_release(ctx, rule);
9873         }
9874         nft_chain_del(ctx->chain);
9875         ctx->table->use--;
9876         nf_tables_chain_destroy(ctx);
9877
9878         return 0;
9879 }
9880 EXPORT_SYMBOL_GPL(__nft_release_basechain);
9881
9882 static void __nft_release_hook(struct net *net, struct nft_table *table)
9883 {
9884         struct nft_flowtable *flowtable;
9885         struct nft_chain *chain;
9886
9887         list_for_each_entry(chain, &table->chains, list)
9888                 __nf_tables_unregister_hook(net, table, chain, true);
9889         list_for_each_entry(flowtable, &table->flowtables, list)
9890                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
9891                                                      true);
9892 }
9893
9894 static void __nft_release_hooks(struct net *net)
9895 {
9896         struct nftables_pernet *nft_net = nft_pernet(net);
9897         struct nft_table *table;
9898
9899         list_for_each_entry(table, &nft_net->tables, list) {
9900                 if (nft_table_has_owner(table))
9901                         continue;
9902
9903                 __nft_release_hook(net, table);
9904         }
9905 }
9906
9907 static void __nft_release_table(struct net *net, struct nft_table *table)
9908 {
9909         struct nft_flowtable *flowtable, *nf;
9910         struct nft_chain *chain, *nc;
9911         struct nft_object *obj, *ne;
9912         struct nft_rule *rule, *nr;
9913         struct nft_set *set, *ns;
9914         struct nft_ctx ctx = {
9915                 .net    = net,
9916                 .family = NFPROTO_NETDEV,
9917         };
9918
9919         ctx.family = table->family;
9920         ctx.table = table;
9921         list_for_each_entry(chain, &table->chains, list) {
9922                 ctx.chain = chain;
9923                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
9924                         list_del(&rule->list);
9925                         chain->use--;
9926                         nf_tables_rule_release(&ctx, rule);
9927                 }
9928         }
9929         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
9930                 list_del(&flowtable->list);
9931                 table->use--;
9932                 nf_tables_flowtable_destroy(flowtable);
9933         }
9934         list_for_each_entry_safe(set, ns, &table->sets, list) {
9935                 list_del(&set->list);
9936                 table->use--;
9937                 nft_set_destroy(&ctx, set);
9938         }
9939         list_for_each_entry_safe(obj, ne, &table->objects, list) {
9940                 nft_obj_del(obj);
9941                 table->use--;
9942                 nft_obj_destroy(&ctx, obj);
9943         }
9944         list_for_each_entry_safe(chain, nc, &table->chains, list) {
9945                 ctx.chain = chain;
9946                 nft_chain_del(chain);
9947                 table->use--;
9948                 nf_tables_chain_destroy(&ctx);
9949         }
9950         nf_tables_table_destroy(&ctx);
9951 }
9952
9953 static void __nft_release_tables(struct net *net)
9954 {
9955         struct nftables_pernet *nft_net = nft_pernet(net);
9956         struct nft_table *table, *nt;
9957
9958         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
9959                 if (nft_table_has_owner(table))
9960                         continue;
9961
9962                 list_del(&table->list);
9963
9964                 __nft_release_table(net, table);
9965         }
9966 }
9967
9968 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
9969                             void *ptr)
9970 {
9971         struct nft_table *table, *to_delete[8];
9972         struct nftables_pernet *nft_net;
9973         struct netlink_notify *n = ptr;
9974         struct net *net = n->net;
9975         unsigned int deleted;
9976         bool restart = false;
9977
9978         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
9979                 return NOTIFY_DONE;
9980
9981         nft_net = nft_pernet(net);
9982         deleted = 0;
9983         mutex_lock(&nft_net->commit_mutex);
9984 again:
9985         list_for_each_entry(table, &nft_net->tables, list) {
9986                 if (nft_table_has_owner(table) &&
9987                     n->portid == table->nlpid) {
9988                         __nft_release_hook(net, table);
9989                         list_del_rcu(&table->list);
9990                         to_delete[deleted++] = table;
9991                         if (deleted >= ARRAY_SIZE(to_delete))
9992                                 break;
9993                 }
9994         }
9995         if (deleted) {
9996                 restart = deleted >= ARRAY_SIZE(to_delete);
9997                 synchronize_rcu();
9998                 while (deleted)
9999                         __nft_release_table(net, to_delete[--deleted]);
10000
10001                 if (restart)
10002                         goto again;
10003         }
10004         mutex_unlock(&nft_net->commit_mutex);
10005
10006         return NOTIFY_DONE;
10007 }
10008
10009 static struct notifier_block nft_nl_notifier = {
10010         .notifier_call  = nft_rcv_nl_event,
10011 };
10012
10013 static int __net_init nf_tables_init_net(struct net *net)
10014 {
10015         struct nftables_pernet *nft_net = nft_pernet(net);
10016
10017         INIT_LIST_HEAD(&nft_net->tables);
10018         INIT_LIST_HEAD(&nft_net->commit_list);
10019         INIT_LIST_HEAD(&nft_net->module_list);
10020         INIT_LIST_HEAD(&nft_net->notify_list);
10021         mutex_init(&nft_net->commit_mutex);
10022         nft_net->base_seq = 1;
10023         nft_net->validate_state = NFT_VALIDATE_SKIP;
10024
10025         return 0;
10026 }
10027
10028 static void __net_exit nf_tables_pre_exit_net(struct net *net)
10029 {
10030         struct nftables_pernet *nft_net = nft_pernet(net);
10031
10032         mutex_lock(&nft_net->commit_mutex);
10033         __nft_release_hooks(net);
10034         mutex_unlock(&nft_net->commit_mutex);
10035 }
10036
10037 static void __net_exit nf_tables_exit_net(struct net *net)
10038 {
10039         struct nftables_pernet *nft_net = nft_pernet(net);
10040
10041         mutex_lock(&nft_net->commit_mutex);
10042         if (!list_empty(&nft_net->commit_list))
10043                 __nf_tables_abort(net, NFNL_ABORT_NONE);
10044         __nft_release_tables(net);
10045         mutex_unlock(&nft_net->commit_mutex);
10046         WARN_ON_ONCE(!list_empty(&nft_net->tables));
10047         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
10048         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10049 }
10050
10051 static struct pernet_operations nf_tables_net_ops = {
10052         .init           = nf_tables_init_net,
10053         .pre_exit       = nf_tables_pre_exit_net,
10054         .exit           = nf_tables_exit_net,
10055         .id             = &nf_tables_net_id,
10056         .size           = sizeof(struct nftables_pernet),
10057 };
10058
10059 static int __init nf_tables_module_init(void)
10060 {
10061         int err;
10062
10063         err = register_pernet_subsys(&nf_tables_net_ops);
10064         if (err < 0)
10065                 return err;
10066
10067         err = nft_chain_filter_init();
10068         if (err < 0)
10069                 goto err_chain_filter;
10070
10071         err = nf_tables_core_module_init();
10072         if (err < 0)
10073                 goto err_core_module;
10074
10075         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10076         if (err < 0)
10077                 goto err_netdev_notifier;
10078
10079         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10080         if (err < 0)
10081                 goto err_rht_objname;
10082
10083         err = nft_offload_init();
10084         if (err < 0)
10085                 goto err_offload;
10086
10087         err = netlink_register_notifier(&nft_nl_notifier);
10088         if (err < 0)
10089                 goto err_netlink_notifier;
10090
10091         /* must be last */
10092         err = nfnetlink_subsys_register(&nf_tables_subsys);
10093         if (err < 0)
10094                 goto err_nfnl_subsys;
10095
10096         nft_chain_route_init();
10097
10098         return err;
10099
10100 err_nfnl_subsys:
10101         netlink_unregister_notifier(&nft_nl_notifier);
10102 err_netlink_notifier:
10103         nft_offload_exit();
10104 err_offload:
10105         rhltable_destroy(&nft_objname_ht);
10106 err_rht_objname:
10107         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10108 err_netdev_notifier:
10109         nf_tables_core_module_exit();
10110 err_core_module:
10111         nft_chain_filter_fini();
10112 err_chain_filter:
10113         unregister_pernet_subsys(&nf_tables_net_ops);
10114         return err;
10115 }
10116
10117 static void __exit nf_tables_module_exit(void)
10118 {
10119         nfnetlink_subsys_unregister(&nf_tables_subsys);
10120         netlink_unregister_notifier(&nft_nl_notifier);
10121         nft_offload_exit();
10122         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10123         nft_chain_filter_fini();
10124         nft_chain_route_fini();
10125         unregister_pernet_subsys(&nf_tables_net_ops);
10126         cancel_work_sync(&trans_destroy_work);
10127         rcu_barrier();
10128         rhltable_destroy(&nft_objname_ht);
10129         nf_tables_core_module_exit();
10130 }
10131
10132 module_init(nf_tables_module_init);
10133 module_exit(nf_tables_module_exit);
10134
10135 MODULE_LICENSE("GPL");
10136 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10137 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);