net/netfilter/nf_tables_api.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
   4  *
   5  * Development of this code funded by Astaro AG (http://www.astaro.com/)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/list.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/netlink.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/rhashtable.h>
  15 #include <linux/audit.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter/nfnetlink.h>
  18 #include <linux/netfilter/nf_tables.h>
  19 #include <net/netfilter/nf_flow_table.h>
  20 #include <net/netfilter/nf_tables_core.h>
  21 #include <net/netfilter/nf_tables.h>
  22 #include <net/netfilter/nf_tables_offload.h>
  23 #include <net/net_namespace.h>
  24 #include <net/sock.h>
  25
  26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
  27
  28 unsigned int nf_tables_net_id __read_mostly;
  29
  30 static LIST_HEAD(nf_tables_expressions);
  31 static LIST_HEAD(nf_tables_objects);
  32 static LIST_HEAD(nf_tables_flowtables);
  33 static LIST_HEAD(nf_tables_destroy_list);
  34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  35
  36 enum {
  37         NFT_VALIDATE_SKIP       = 0,
  38         NFT_VALIDATE_NEED,
  39         NFT_VALIDATE_DO,
  40 };
  41
  42 static struct rhltable nft_objname_ht;
  43
  44 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  45 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  46 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  47
  48 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  49 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  50 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  51
  52 static const struct rhashtable_params nft_chain_ht_params = {
  53         .head_offset            = offsetof(struct nft_chain, rhlhead),
  54         .key_offset             = offsetof(struct nft_chain, name),
  55         .hashfn                 = nft_chain_hash,
  56         .obj_hashfn             = nft_chain_hash_obj,
  57         .obj_cmpfn              = nft_chain_hash_cmp,
  58         .automatic_shrinking    = true,
  59 };
  60
  61 static const struct rhashtable_params nft_objname_ht_params = {
  62         .head_offset            = offsetof(struct nft_object, rhlhead),
  63         .key_offset             = offsetof(struct nft_object, key),
  64         .hashfn                 = nft_objname_hash,
  65         .obj_hashfn             = nft_objname_hash_obj,
  66         .obj_cmpfn              = nft_objname_hash_cmp,
  67         .automatic_shrinking    = true,
  68 };
  69
  70 struct nft_audit_data {
  71         struct nft_table *table;
  72         int entries;
  73         int op;
  74         struct list_head list;
  75 };
  76
  77 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  78         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  79         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  80         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  81         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  82         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  83         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  84         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  85         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  86         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  87         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  88         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  89         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  90         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  91         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  92         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  93         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  94         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  95         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  96         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
  97         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
  98         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
  99         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 100         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 101         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 102         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 103 };
 104
 105 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
 106 {
 107         switch (table->validate_state) {
 108         case NFT_VALIDATE_SKIP:
 109                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 110                 break;
 111         case NFT_VALIDATE_NEED:
 112                 break;
 113         case NFT_VALIDATE_DO:
 114                 if (new_validate_state == NFT_VALIDATE_NEED)
 115                         return;
 116         }
 117
 118         table->validate_state = new_validate_state;
 119 }
 120 static void nf_tables_trans_destroy_work(struct work_struct *w);
 121 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 122
 123 static void nft_ctx_init(struct nft_ctx *ctx,
 124                          struct net *net,
 125                          const struct sk_buff *skb,
 126                          const struct nlmsghdr *nlh,
 127                          u8 family,
 128                          struct nft_table *table,
 129                          struct nft_chain *chain,
 130                          const struct nlattr * const *nla)
 131 {
 132         ctx->net        = net;
 133         ctx->family     = family;
 134         ctx->level      = 0;
 135         ctx->table      = table;
 136         ctx->chain      = chain;
 137         ctx->nla        = nla;
 138         ctx->portid     = NETLINK_CB(skb).portid;
 139         ctx->report     = nlmsg_report(nlh);
 140         ctx->flags      = nlh->nlmsg_flags;
 141         ctx->seq        = nlh->nlmsg_seq;
 142 }
 143
 144 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 145                                              int msg_type, u32 size, gfp_t gfp)
 146 {
 147         struct nft_trans *trans;
 148
 149         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 150         if (trans == NULL)
 151                 return NULL;
 152
 153         INIT_LIST_HEAD(&trans->list);
 154         trans->msg_type = msg_type;
 155         trans->ctx      = *ctx;
 156
 157         return trans;
 158 }
 159
 160 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 161                                          int msg_type, u32 size)
 162 {
 163         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 164 }
 165
 166 static void nft_trans_destroy(struct nft_trans *trans)
 167 {
 168         list_del(&trans->list);
 169         kfree(trans);
 170 }
 171
 172 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 173 {
 174         struct nftables_pernet *nft_net;
 175         struct net *net = ctx->net;
 176         struct nft_trans *trans;
 177
 178         if (!nft_set_is_anonymous(set))
 179                 return;
 180
 181         nft_net = nft_pernet(net);
 182         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 183                 switch (trans->msg_type) {
 184                 case NFT_MSG_NEWSET:
 185                         if (nft_trans_set(trans) == set)
 186                                 nft_trans_set_bound(trans) = true;
 187                         break;
 188                 case NFT_MSG_NEWSETELEM:
 189                         if (nft_trans_elem_set(trans) == set)
 190                                 nft_trans_elem_set_bound(trans) = true;
 191                         break;
 192                 }
 193         }
 194 }
 195
 196 static int nft_netdev_register_hooks(struct net *net,
 197                                      struct list_head *hook_list)
 198 {
 199         struct nft_hook *hook;
 200         int err, j;
 201
 202         j = 0;
 203         list_for_each_entry(hook, hook_list, list) {
 204                 err = nf_register_net_hook(net, &hook->ops);
 205                 if (err < 0)
 206                         goto err_register;
 207
 208                 j++;
 209         }
 210         return 0;
 211
 212 err_register:
 213         list_for_each_entry(hook, hook_list, list) {
 214                 if (j-- <= 0)
 215                         break;
 216
 217                 nf_unregister_net_hook(net, &hook->ops);
 218         }
 219         return err;
 220 }
 221
 222 static void nft_netdev_unregister_hooks(struct net *net,
 223                                         struct list_head *hook_list,
 224                                         bool release_netdev)
 225 {
 226         struct nft_hook *hook, *next;
 227
 228         list_for_each_entry_safe(hook, next, hook_list, list) {
 229                 nf_unregister_net_hook(net, &hook->ops);
 230                 if (release_netdev) {
 231                         list_del(&hook->list);
 232                         kfree_rcu(hook, rcu);
 233                 }
 234         }
 235 }
 236
 237 static int nf_tables_register_hook(struct net *net,
 238                                    const struct nft_table *table,
 239                                    struct nft_chain *chain)
 240 {
 241         struct nft_base_chain *basechain;
 242         const struct nf_hook_ops *ops;
 243
 244         if (table->flags & NFT_TABLE_F_DORMANT ||
 245             !nft_is_base_chain(chain))
 246                 return 0;
 247
 248         basechain = nft_base_chain(chain);
 249         ops = &basechain->ops;
 250
 251         if (basechain->type->ops_register)
 252                 return basechain->type->ops_register(net, ops);
 253
 254         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 255                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 256
 257         return nf_register_net_hook(net, &basechain->ops);
 258 }
 259
 260 static void __nf_tables_unregister_hook(struct net *net,
 261                                         const struct nft_table *table,
 262                                         struct nft_chain *chain,
 263                                         bool release_netdev)
 264 {
 265         struct nft_base_chain *basechain;
 266         const struct nf_hook_ops *ops;
 267
 268         if (table->flags & NFT_TABLE_F_DORMANT ||
 269             !nft_is_base_chain(chain))
 270                 return;
 271         basechain = nft_base_chain(chain);
 272         ops = &basechain->ops;
 273
 274         if (basechain->type->ops_unregister)
 275                 return basechain->type->ops_unregister(net, ops);
 276
 277         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 278                 nft_netdev_unregister_hooks(net, &basechain->hook_list,
 279                                             release_netdev);
 280         else
 281                 nf_unregister_net_hook(net, &basechain->ops);
 282 }
 283
 284 static void nf_tables_unregister_hook(struct net *net,
 285                                       const struct nft_table *table,
 286                                       struct nft_chain *chain)
 287 {
 288         return __nf_tables_unregister_hook(net, table, chain, false);
 289 }
 290
 291 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 292 {
 293         struct nftables_pernet *nft_net = nft_pernet(net);
 294
 295         list_add_tail(&trans->list, &nft_net->commit_list);
 296 }
 297
 298 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 299 {
 300         struct nft_trans *trans;
 301
 302         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 303         if (trans == NULL)
 304                 return -ENOMEM;
 305
 306         if (msg_type == NFT_MSG_NEWTABLE)
 307                 nft_activate_next(ctx->net, ctx->table);
 308
 309         nft_trans_commit_list_add_tail(ctx->net, trans);
 310         return 0;
 311 }
 312
 313 static int nft_deltable(struct nft_ctx *ctx)
 314 {
 315         int err;
 316
 317         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 318         if (err < 0)
 319                 return err;
 320
 321         nft_deactivate_next(ctx->net, ctx->table);
 322         return err;
 323 }
 324
 325 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 326 {
 327         struct nft_trans *trans;
 328
 329         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 330         if (trans == NULL)
 331                 return ERR_PTR(-ENOMEM);
 332
 333         if (msg_type == NFT_MSG_NEWCHAIN) {
 334                 nft_activate_next(ctx->net, ctx->chain);
 335
 336                 if (ctx->nla[NFTA_CHAIN_ID]) {
 337                         nft_trans_chain_id(trans) =
 338                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 339                 }
 340         }
 341
 342         nft_trans_commit_list_add_tail(ctx->net, trans);
 343         return trans;
 344 }
 345
 346 static int nft_delchain(struct nft_ctx *ctx)
 347 {
 348         struct nft_trans *trans;
 349
 350         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 351         if (IS_ERR(trans))
 352                 return PTR_ERR(trans);
 353
 354         ctx->table->use--;
 355         nft_deactivate_next(ctx->net, ctx->chain);
 356
 357         return 0;
 358 }
 359
 360 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
 361                                    struct nft_rule *rule)
 362 {
 363         struct nft_expr *expr;
 364
 365         expr = nft_expr_first(rule);
 366         while (nft_expr_more(rule, expr)) {
 367                 if (expr->ops->activate)
 368                         expr->ops->activate(ctx, expr);
 369
 370                 expr = nft_expr_next(expr);
 371         }
 372 }
 373
 374 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
 375                                      struct nft_rule *rule,
 376                                      enum nft_trans_phase phase)
 377 {
 378         struct nft_expr *expr;
 379
 380         expr = nft_expr_first(rule);
 381         while (nft_expr_more(rule, expr)) {
 382                 if (expr->ops->deactivate)
 383                         expr->ops->deactivate(ctx, expr, phase);
 384
 385                 expr = nft_expr_next(expr);
 386         }
 387 }
 388
 389 static int
 390 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 391 {
 392         /* You cannot delete the same rule twice */
 393         if (nft_is_active_next(ctx->net, rule)) {
 394                 nft_deactivate_next(ctx->net, rule);
 395                 ctx->chain->use--;
 396                 return 0;
 397         }
 398         return -ENOENT;
 399 }
 400
 401 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 402                                             struct nft_rule *rule)
 403 {
 404         struct nft_trans *trans;
 405
 406         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 407         if (trans == NULL)
 408                 return NULL;
 409
 410         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 411                 nft_trans_rule_id(trans) =
 412                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 413         }
 414         nft_trans_rule(trans) = rule;
 415         nft_trans_commit_list_add_tail(ctx->net, trans);
 416
 417         return trans;
 418 }
 419
 420 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 421 {
 422         struct nft_flow_rule *flow;
 423         struct nft_trans *trans;
 424         int err;
 425
 426         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 427         if (trans == NULL)
 428                 return -ENOMEM;
 429
 430         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 431                 flow = nft_flow_rule_create(ctx->net, rule);
 432                 if (IS_ERR(flow)) {
 433                         nft_trans_destroy(trans);
 434                         return PTR_ERR(flow);
 435                 }
 436
 437                 nft_trans_flow_rule(trans) = flow;
 438         }
 439
 440         err = nf_tables_delrule_deactivate(ctx, rule);
 441         if (err < 0) {
 442                 nft_trans_destroy(trans);
 443                 return err;
 444         }
 445         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 446
 447         return 0;
 448 }
 449
 450 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 451 {
 452         struct nft_rule *rule;
 453         int err;
 454
 455         list_for_each_entry(rule, &ctx->chain->rules, list) {
 456                 if (!nft_is_active_next(ctx->net, rule))
 457                         continue;
 458
 459                 err = nft_delrule(ctx, rule);
 460                 if (err < 0)
 461                         return err;
 462         }
 463         return 0;
 464 }
 465
 466 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 467                                struct nft_set *set,
 468                                const struct nft_set_desc *desc)
 469 {
 470         struct nft_trans *trans;
 471
 472         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 473         if (trans == NULL)
 474                 return -ENOMEM;
 475
 476         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
 477                 nft_trans_set_id(trans) =
 478                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 479                 nft_activate_next(ctx->net, set);
 480         }
 481         nft_trans_set(trans) = set;
 482         if (desc) {
 483                 nft_trans_set_update(trans) = true;
 484                 nft_trans_set_gc_int(trans) = desc->gc_int;
 485                 nft_trans_set_timeout(trans) = desc->timeout;
 486         }
 487         nft_trans_commit_list_add_tail(ctx->net, trans);
 488
 489         return 0;
 490 }
 491
 492 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 493                              struct nft_set *set)
 494 {
 495         return __nft_trans_set_add(ctx, msg_type, set, NULL);
 496 }
 497
 498 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 499 {
 500         int err;
 501
 502         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 503         if (err < 0)
 504                 return err;
 505
 506         nft_deactivate_next(ctx->net, set);
 507         ctx->table->use--;
 508
 509         return err;
 510 }
 511
 512 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 513                              struct nft_object *obj)
 514 {
 515         struct nft_trans *trans;
 516
 517         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 518         if (trans == NULL)
 519                 return -ENOMEM;
 520
 521         if (msg_type == NFT_MSG_NEWOBJ)
 522                 nft_activate_next(ctx->net, obj);
 523
 524         nft_trans_obj(trans) = obj;
 525         nft_trans_commit_list_add_tail(ctx->net, trans);
 526
 527         return 0;
 528 }
 529
 530 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 531 {
 532         int err;
 533
 534         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 535         if (err < 0)
 536                 return err;
 537
 538         nft_deactivate_next(ctx->net, obj);
 539         ctx->table->use--;
 540
 541         return err;
 542 }
 543
 544 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 545                                    struct nft_flowtable *flowtable)
 546 {
 547         struct nft_trans *trans;
 548
 549         trans = nft_trans_alloc(ctx, msg_type,
 550                                 sizeof(struct nft_trans_flowtable));
 551         if (trans == NULL)
 552                 return -ENOMEM;
 553
 554         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 555                 nft_activate_next(ctx->net, flowtable);
 556
 557         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
 558         nft_trans_flowtable(trans) = flowtable;
 559         nft_trans_commit_list_add_tail(ctx->net, trans);
 560
 561         return 0;
 562 }
 563
 564 static int nft_delflowtable(struct nft_ctx *ctx,
 565                             struct nft_flowtable *flowtable)
 566 {
 567         int err;
 568
 569         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 570         if (err < 0)
 571                 return err;
 572
 573         nft_deactivate_next(ctx->net, flowtable);
 574         ctx->table->use--;
 575
 576         return err;
 577 }
 578
 579 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
 580 {
 581         int i;
 582
 583         for (i = track->regs[dreg].num_reg; i > 0; i--)
 584                 __nft_reg_track_cancel(track, dreg - i);
 585 }
 586
 587 static void __nft_reg_track_update(struct nft_regs_track *track,
 588                                    const struct nft_expr *expr,
 589                                    u8 dreg, u8 num_reg)
 590 {
 591         track->regs[dreg].selector = expr;
 592         track->regs[dreg].bitwise = NULL;
 593         track->regs[dreg].num_reg = num_reg;
 594 }
 595
 596 void nft_reg_track_update(struct nft_regs_track *track,
 597                           const struct nft_expr *expr, u8 dreg, u8 len)
 598 {
 599         unsigned int regcount;
 600         int i;
 601
 602         __nft_reg_track_clobber(track, dreg);
 603
 604         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 605         for (i = 0; i < regcount; i++, dreg++)
 606                 __nft_reg_track_update(track, expr, dreg, i);
 607 }
 608 EXPORT_SYMBOL_GPL(nft_reg_track_update);
 609
 610 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
 611 {
 612         unsigned int regcount;
 613         int i;
 614
 615         __nft_reg_track_clobber(track, dreg);
 616
 617         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 618         for (i = 0; i < regcount; i++, dreg++)
 619                 __nft_reg_track_cancel(track, dreg);
 620 }
 621 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
 622
 623 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
 624 {
 625         track->regs[dreg].selector = NULL;
 626         track->regs[dreg].bitwise = NULL;
 627         track->regs[dreg].num_reg = 0;
 628 }
 629 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
 630
 631 /*
 632  * Tables
 633  */
 634
 635 static struct nft_table *nft_table_lookup(const struct net *net,
 636                                           const struct nlattr *nla,
 637                                           u8 family, u8 genmask, u32 nlpid)
 638 {
 639         struct nftables_pernet *nft_net;
 640         struct nft_table *table;
 641
 642         if (nla == NULL)
 643                 return ERR_PTR(-EINVAL);
 644
 645         nft_net = nft_pernet(net);
 646         list_for_each_entry_rcu(table, &nft_net->tables, list,
 647                                 lockdep_is_held(&nft_net->commit_mutex)) {
 648                 if (!nla_strcmp(nla, table->name) &&
 649                     table->family == family &&
 650                     nft_active_genmask(table, genmask)) {
 651                         if (nft_table_has_owner(table) &&
 652                             nlpid && table->nlpid != nlpid)
 653                                 return ERR_PTR(-EPERM);
 654
 655                         return table;
 656                 }
 657         }
 658
 659         return ERR_PTR(-ENOENT);
 660 }
 661
 662 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 663                                                    const struct nlattr *nla,
 664                                                    u8 genmask, u32 nlpid)
 665 {
 666         struct nftables_pernet *nft_net;
 667         struct nft_table *table;
 668
 669         nft_net = nft_pernet(net);
 670         list_for_each_entry(table, &nft_net->tables, list) {
 671                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 672                     nft_active_genmask(table, genmask)) {
 673                         if (nft_table_has_owner(table) &&
 674                             nlpid && table->nlpid != nlpid)
 675                                 return ERR_PTR(-EPERM);
 676
 677                         return table;
 678                 }
 679         }
 680
 681         return ERR_PTR(-ENOENT);
 682 }
 683
 684 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 685 {
 686         return ++table->hgenerator;
 687 }
 688
 689 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 690
 691 static const struct nft_chain_type *
 692 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 693 {
 694         if (family >= NFPROTO_NUMPROTO ||
 695             type >= NFT_CHAIN_T_MAX)
 696                 return NULL;
 697
 698         return chain_type[family][type];
 699 }
 700
 701 static const struct nft_chain_type *
 702 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 703 {
 704         const struct nft_chain_type *type;
 705         int i;
 706
 707         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 708                 type = __nft_chain_type_get(family, i);
 709                 if (!type)
 710                         continue;
 711                 if (!nla_strcmp(nla, type->name))
 712                         return type;
 713         }
 714         return NULL;
 715 }
 716
 717 struct nft_module_request {
 718         struct list_head        list;
 719         char                    module[MODULE_NAME_LEN];
 720         bool                    done;
 721 };
 722
 723 #ifdef CONFIG_MODULES
 724 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 725                                       ...)
 726 {
 727         char module_name[MODULE_NAME_LEN];
 728         struct nftables_pernet *nft_net;
 729         struct nft_module_request *req;
 730         va_list args;
 731         int ret;
 732
 733         va_start(args, fmt);
 734         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 735         va_end(args);
 736         if (ret >= MODULE_NAME_LEN)
 737                 return 0;
 738
 739         nft_net = nft_pernet(net);
 740         list_for_each_entry(req, &nft_net->module_list, list) {
 741                 if (!strcmp(req->module, module_name)) {
 742                         if (req->done)
 743                                 return 0;
 744
 745                         /* A request to load this module already exists. */
 746                         return -EAGAIN;
 747                 }
 748         }
 749
 750         req = kmalloc(sizeof(*req), GFP_KERNEL);
 751         if (!req)
 752                 return -ENOMEM;
 753
 754         req->done = false;
 755         strscpy(req->module, module_name, MODULE_NAME_LEN);
 756         list_add_tail(&req->list, &nft_net->module_list);
 757
 758         return -EAGAIN;
 759 }
 760 EXPORT_SYMBOL_GPL(nft_request_module);
 761 #endif
 762
 763 static void lockdep_nfnl_nft_mutex_not_held(void)
 764 {
 765 #ifdef CONFIG_PROVE_LOCKING
 766         if (debug_locks)
 767                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 768 #endif
 769 }
 770
 771 static const struct nft_chain_type *
 772 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 773                             u8 family, bool autoload)
 774 {
 775         const struct nft_chain_type *type;
 776
 777         type = __nf_tables_chain_type_lookup(nla, family);
 778         if (type != NULL)
 779                 return type;
 780
 781         lockdep_nfnl_nft_mutex_not_held();
 782 #ifdef CONFIG_MODULES
 783         if (autoload) {
 784                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 785                                        nla_len(nla),
 786                                        (const char *)nla_data(nla)) == -EAGAIN)
 787                         return ERR_PTR(-EAGAIN);
 788         }
 789 #endif
 790         return ERR_PTR(-ENOENT);
 791 }
 792
 793 static __be16 nft_base_seq(const struct net *net)
 794 {
 795         struct nftables_pernet *nft_net = nft_pernet(net);
 796
 797         return htons(nft_net->base_seq & 0xffff);
 798 }
 799
 800 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 801         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 802                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 803         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 804         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 805         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 806                                     .len = NFT_USERDATA_MAXLEN }
 807 };
 808
 809 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 810                                      u32 portid, u32 seq, int event, u32 flags,
 811                                      int family, const struct nft_table *table)
 812 {
 813         struct nlmsghdr *nlh;
 814
 815         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 816         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 817                            NFNETLINK_V0, nft_base_seq(net));
 818         if (!nlh)
 819                 goto nla_put_failure;
 820
 821         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 822             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 823             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 824                          NFTA_TABLE_PAD))
 825                 goto nla_put_failure;
 826
 827         if (event == NFT_MSG_DELTABLE) {
 828                 nlmsg_end(skb, nlh);
 829                 return 0;
 830         }
 831
 832         if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
 833                          htonl(table->flags & NFT_TABLE_F_MASK)))
 834                 goto nla_put_failure;
 835
 836         if (nft_table_has_owner(table) &&
 837             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 838                 goto nla_put_failure;
 839
 840         if (table->udata) {
 841                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 842                         goto nla_put_failure;
 843         }
 844
 845         nlmsg_end(skb, nlh);
 846         return 0;
 847
 848 nla_put_failure:
 849         nlmsg_trim(skb, nlh);
 850         return -1;
 851 }
 852
 853 struct nftnl_skb_parms {
 854         bool report;
 855 };
 856 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 857
 858 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 859                                struct list_head *notify_list)
 860 {
 861         NFT_CB(skb).report = report;
 862         list_add_tail(&skb->list, notify_list);
 863 }
 864
 865 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 866 {
 867         struct nftables_pernet *nft_net;
 868         struct sk_buff *skb;
 869         u16 flags = 0;
 870         int err;
 871
 872         if (!ctx->report &&
 873             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 874                 return;
 875
 876         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 877         if (skb == NULL)
 878                 goto err;
 879
 880         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
 881                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
 882
 883         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 884                                         event, flags, ctx->family, ctx->table);
 885         if (err < 0) {
 886                 kfree_skb(skb);
 887                 goto err;
 888         }
 889
 890         nft_net = nft_pernet(ctx->net);
 891         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
 892         return;
 893 err:
 894         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 895 }
 896
 897 static int nf_tables_dump_tables(struct sk_buff *skb,
 898                                  struct netlink_callback *cb)
 899 {
 900         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 901         struct nftables_pernet *nft_net;
 902         const struct nft_table *table;
 903         unsigned int idx = 0, s_idx = cb->args[0];
 904         struct net *net = sock_net(skb->sk);
 905         int family = nfmsg->nfgen_family;
 906
 907         rcu_read_lock();
 908         nft_net = nft_pernet(net);
 909         cb->seq = READ_ONCE(nft_net->base_seq);
 910
 911         list_for_each_entry_rcu(table, &nft_net->tables, list) {
 912                 if (family != NFPROTO_UNSPEC && family != table->family)
 913                         continue;
 914
 915                 if (idx < s_idx)
 916                         goto cont;
 917                 if (idx > s_idx)
 918                         memset(&cb->args[1], 0,
 919                                sizeof(cb->args) - sizeof(cb->args[0]));
 920                 if (!nft_is_active(net, table))
 921                         continue;
 922                 if (nf_tables_fill_table_info(skb, net,
 923                                               NETLINK_CB(cb->skb).portid,
 924                                               cb->nlh->nlmsg_seq,
 925                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 926                                               table->family, table) < 0)
 927                         goto done;
 928
 929                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 930 cont:
 931                 idx++;
 932         }
 933 done:
 934         rcu_read_unlock();
 935         cb->args[0] = idx;
 936         return skb->len;
 937 }
 938
 939 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 940                                       const struct nlmsghdr *nlh,
 941                                       struct netlink_dump_control *c)
 942 {
 943         int err;
 944
 945         if (!try_module_get(THIS_MODULE))
 946                 return -EINVAL;
 947
 948         rcu_read_unlock();
 949         err = netlink_dump_start(nlsk, skb, nlh, c);
 950         rcu_read_lock();
 951         module_put(THIS_MODULE);
 952
 953         return err;
 954 }
 955
 956 /* called with rcu_read_lock held */
 957 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
 958                               const struct nlattr * const nla[])
 959 {
 960         struct netlink_ext_ack *extack = info->extack;
 961         u8 genmask = nft_genmask_cur(info->net);
 962         u8 family = info->nfmsg->nfgen_family;
 963         const struct nft_table *table;
 964         struct net *net = info->net;
 965         struct sk_buff *skb2;
 966         int err;
 967
 968         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
 969                 struct netlink_dump_control c = {
 970                         .dump = nf_tables_dump_tables,
 971                         .module = THIS_MODULE,
 972                 };
 973
 974                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
 975         }
 976
 977         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
 978         if (IS_ERR(table)) {
 979                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 980                 return PTR_ERR(table);
 981         }
 982
 983         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 984         if (!skb2)
 985                 return -ENOMEM;
 986
 987         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 988                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
 989                                         0, family, table);
 990         if (err < 0)
 991                 goto err_fill_table_info;
 992
 993         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 994
 995 err_fill_table_info:
 996         kfree_skb(skb2);
 997         return err;
 998 }
 999
1000 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1001 {
1002         struct nft_chain *chain;
1003         u32 i = 0;
1004
1005         list_for_each_entry(chain, &table->chains, list) {
1006                 if (!nft_is_active_next(net, chain))
1007                         continue;
1008                 if (!nft_is_base_chain(chain))
1009                         continue;
1010
1011                 if (cnt && i++ == cnt)
1012                         break;
1013
1014                 nf_tables_unregister_hook(net, table, chain);
1015         }
1016 }
1017
1018 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1019 {
1020         struct nft_chain *chain;
1021         int err, i = 0;
1022
1023         list_for_each_entry(chain, &table->chains, list) {
1024                 if (!nft_is_active_next(net, chain))
1025                         continue;
1026                 if (!nft_is_base_chain(chain))
1027                         continue;
1028
1029                 err = nf_tables_register_hook(net, table, chain);
1030                 if (err < 0)
1031                         goto err_register_hooks;
1032
1033                 i++;
1034         }
1035         return 0;
1036
1037 err_register_hooks:
1038         if (i)
1039                 nft_table_disable(net, table, i);
1040         return err;
1041 }
1042
1043 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1044 {
1045         table->flags &= ~NFT_TABLE_F_DORMANT;
1046         nft_table_disable(net, table, 0);
1047         table->flags |= NFT_TABLE_F_DORMANT;
1048 }
1049
1050 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
1051 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
1052 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
1053 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
1054                                          __NFT_TABLE_F_WAS_AWAKEN)
1055
1056 static int nf_tables_updtable(struct nft_ctx *ctx)
1057 {
1058         struct nft_trans *trans;
1059         u32 flags;
1060         int ret;
1061
1062         if (!ctx->nla[NFTA_TABLE_FLAGS])
1063                 return 0;
1064
1065         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1066         if (flags & ~NFT_TABLE_F_MASK)
1067                 return -EOPNOTSUPP;
1068
1069         if (flags == ctx->table->flags)
1070                 return 0;
1071
1072         if ((nft_table_has_owner(ctx->table) &&
1073              !(flags & NFT_TABLE_F_OWNER)) ||
1074             (!nft_table_has_owner(ctx->table) &&
1075              flags & NFT_TABLE_F_OWNER))
1076                 return -EOPNOTSUPP;
1077
1078         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1079                                 sizeof(struct nft_trans_table));
1080         if (trans == NULL)
1081                 return -ENOMEM;
1082
1083         if ((flags & NFT_TABLE_F_DORMANT) &&
1084             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1085                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1086                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1087                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1088         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1089                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1090                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1091                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1092                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1093                         if (ret < 0)
1094                                 goto err_register_hooks;
1095
1096                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1097                 }
1098         }
1099
1100         nft_trans_table_update(trans) = true;
1101         nft_trans_commit_list_add_tail(ctx->net, trans);
1102
1103         return 0;
1104
1105 err_register_hooks:
1106         nft_trans_destroy(trans);
1107         return ret;
1108 }
1109
1110 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1111 {
1112         const char *name = data;
1113
1114         return jhash(name, strlen(name), seed);
1115 }
1116
1117 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1118 {
1119         const struct nft_chain *chain = data;
1120
1121         return nft_chain_hash(chain->name, 0, seed);
1122 }
1123
1124 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1125                               const void *ptr)
1126 {
1127         const struct nft_chain *chain = ptr;
1128         const char *name = arg->key;
1129
1130         return strcmp(chain->name, name);
1131 }
1132
1133 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1134 {
1135         const struct nft_object_hash_key *k = data;
1136
1137         seed ^= hash_ptr(k->table, 32);
1138
1139         return jhash(k->name, strlen(k->name), seed);
1140 }
1141
1142 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1143 {
1144         const struct nft_object *obj = data;
1145
1146         return nft_objname_hash(&obj->key, 0, seed);
1147 }
1148
1149 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1150                                 const void *ptr)
1151 {
1152         const struct nft_object_hash_key *k = arg->key;
1153         const struct nft_object *obj = ptr;
1154
1155         if (obj->key.table != k->table)
1156                 return -1;
1157
1158         return strcmp(obj->key.name, k->name);
1159 }
1160
1161 static bool nft_supported_family(u8 family)
1162 {
1163         return false
1164 #ifdef CONFIG_NF_TABLES_INET
1165                 || family == NFPROTO_INET
1166 #endif
1167 #ifdef CONFIG_NF_TABLES_IPV4
1168                 || family == NFPROTO_IPV4
1169 #endif
1170 #ifdef CONFIG_NF_TABLES_ARP
1171                 || family == NFPROTO_ARP
1172 #endif
1173 #ifdef CONFIG_NF_TABLES_NETDEV
1174                 || family == NFPROTO_NETDEV
1175 #endif
1176 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1177                 || family == NFPROTO_BRIDGE
1178 #endif
1179 #ifdef CONFIG_NF_TABLES_IPV6
1180                 || family == NFPROTO_IPV6
1181 #endif
1182                 ;
1183 }
1184
1185 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1186                               const struct nlattr * const nla[])
1187 {
1188         struct nftables_pernet *nft_net = nft_pernet(info->net);
1189         struct netlink_ext_ack *extack = info->extack;
1190         u8 genmask = nft_genmask_next(info->net);
1191         u8 family = info->nfmsg->nfgen_family;
1192         struct net *net = info->net;
1193         const struct nlattr *attr;
1194         struct nft_table *table;
1195         struct nft_ctx ctx;
1196         u32 flags = 0;
1197         int err;
1198
1199         if (!nft_supported_family(family))
1200                 return -EOPNOTSUPP;
1201
1202         lockdep_assert_held(&nft_net->commit_mutex);
1203         attr = nla[NFTA_TABLE_NAME];
1204         table = nft_table_lookup(net, attr, family, genmask,
1205                                  NETLINK_CB(skb).portid);
1206         if (IS_ERR(table)) {
1207                 if (PTR_ERR(table) != -ENOENT)
1208                         return PTR_ERR(table);
1209         } else {
1210                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1211                         NL_SET_BAD_ATTR(extack, attr);
1212                         return -EEXIST;
1213                 }
1214                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1215                         return -EOPNOTSUPP;
1216
1217                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1218
1219                 return nf_tables_updtable(&ctx);
1220         }
1221
1222         if (nla[NFTA_TABLE_FLAGS]) {
1223                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1224                 if (flags & ~NFT_TABLE_F_MASK)
1225                         return -EOPNOTSUPP;
1226         }
1227
1228         err = -ENOMEM;
1229         table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1230         if (table == NULL)
1231                 goto err_kzalloc;
1232
1233         table->validate_state = NFT_VALIDATE_SKIP;
1234         table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1235         if (table->name == NULL)
1236                 goto err_strdup;
1237
1238         if (nla[NFTA_TABLE_USERDATA]) {
1239                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1240                 if (table->udata == NULL)
1241                         goto err_table_udata;
1242
1243                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1244         }
1245
1246         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1247         if (err)
1248                 goto err_chain_ht;
1249
1250         INIT_LIST_HEAD(&table->chains);
1251         INIT_LIST_HEAD(&table->sets);
1252         INIT_LIST_HEAD(&table->objects);
1253         INIT_LIST_HEAD(&table->flowtables);
1254         table->family = family;
1255         table->flags = flags;
1256         table->handle = ++nft_net->table_handle;
1257         if (table->flags & NFT_TABLE_F_OWNER)
1258                 table->nlpid = NETLINK_CB(skb).portid;
1259
1260         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1261         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1262         if (err < 0)
1263                 goto err_trans;
1264
1265         list_add_tail_rcu(&table->list, &nft_net->tables);
1266         return 0;
1267 err_trans:
1268         rhltable_destroy(&table->chains_ht);
1269 err_chain_ht:
1270         kfree(table->udata);
1271 err_table_udata:
1272         kfree(table->name);
1273 err_strdup:
1274         kfree(table);
1275 err_kzalloc:
1276         return err;
1277 }
1278
1279 static int nft_flush_table(struct nft_ctx *ctx)
1280 {
1281         struct nft_flowtable *flowtable, *nft;
1282         struct nft_chain *chain, *nc;
1283         struct nft_object *obj, *ne;
1284         struct nft_set *set, *ns;
1285         int err;
1286
1287         list_for_each_entry(chain, &ctx->table->chains, list) {
1288                 if (!nft_is_active_next(ctx->net, chain))
1289                         continue;
1290
1291                 if (nft_chain_is_bound(chain))
1292                         continue;
1293
1294                 ctx->chain = chain;
1295
1296                 err = nft_delrule_by_chain(ctx);
1297                 if (err < 0)
1298                         goto out;
1299         }
1300
1301         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1302                 if (!nft_is_active_next(ctx->net, set))
1303                         continue;
1304
1305                 if (nft_set_is_anonymous(set) &&
1306                     !list_empty(&set->bindings))
1307                         continue;
1308
1309                 err = nft_delset(ctx, set);
1310                 if (err < 0)
1311                         goto out;
1312         }
1313
1314         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1315                 if (!nft_is_active_next(ctx->net, flowtable))
1316                         continue;
1317
1318                 err = nft_delflowtable(ctx, flowtable);
1319                 if (err < 0)
1320                         goto out;
1321         }
1322
1323         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1324                 if (!nft_is_active_next(ctx->net, obj))
1325                         continue;
1326
1327                 err = nft_delobj(ctx, obj);
1328                 if (err < 0)
1329                         goto out;
1330         }
1331
1332         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1333                 if (!nft_is_active_next(ctx->net, chain))
1334                         continue;
1335
1336                 if (nft_chain_is_bound(chain))
1337                         continue;
1338
1339                 ctx->chain = chain;
1340
1341                 err = nft_delchain(ctx);
1342                 if (err < 0)
1343                         goto out;
1344         }
1345
1346         err = nft_deltable(ctx);
1347 out:
1348         return err;
1349 }
1350
1351 static int nft_flush(struct nft_ctx *ctx, int family)
1352 {
1353         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1354         const struct nlattr * const *nla = ctx->nla;
1355         struct nft_table *table, *nt;
1356         int err = 0;
1357
1358         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1359                 if (family != AF_UNSPEC && table->family != family)
1360                         continue;
1361
1362                 ctx->family = table->family;
1363
1364                 if (!nft_is_active_next(ctx->net, table))
1365                         continue;
1366
1367                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1368                         continue;
1369
1370                 if (nla[NFTA_TABLE_NAME] &&
1371                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1372                         continue;
1373
1374                 ctx->table = table;
1375
1376                 err = nft_flush_table(ctx);
1377                 if (err < 0)
1378                         goto out;
1379         }
1380 out:
1381         return err;
1382 }
1383
1384 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1385                               const struct nlattr * const nla[])
1386 {
1387         struct netlink_ext_ack *extack = info->extack;
1388         u8 genmask = nft_genmask_next(info->net);
1389         u8 family = info->nfmsg->nfgen_family;
1390         struct net *net = info->net;
1391         const struct nlattr *attr;
1392         struct nft_table *table;
1393         struct nft_ctx ctx;
1394
1395         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1396         if (family == AF_UNSPEC ||
1397             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1398                 return nft_flush(&ctx, family);
1399
1400         if (nla[NFTA_TABLE_HANDLE]) {
1401                 attr = nla[NFTA_TABLE_HANDLE];
1402                 table = nft_table_lookup_byhandle(net, attr, genmask,
1403                                                   NETLINK_CB(skb).portid);
1404         } else {
1405                 attr = nla[NFTA_TABLE_NAME];
1406                 table = nft_table_lookup(net, attr, family, genmask,
1407                                          NETLINK_CB(skb).portid);
1408         }
1409
1410         if (IS_ERR(table)) {
1411                 if (PTR_ERR(table) == -ENOENT &&
1412                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1413                         return 0;
1414
1415                 NL_SET_BAD_ATTR(extack, attr);
1416                 return PTR_ERR(table);
1417         }
1418
1419         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1420             table->use > 0)
1421                 return -EBUSY;
1422
1423         ctx.family = family;
1424         ctx.table = table;
1425
1426         return nft_flush_table(&ctx);
1427 }
1428
1429 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1430 {
1431         if (WARN_ON(ctx->table->use > 0))
1432                 return;
1433
1434         rhltable_destroy(&ctx->table->chains_ht);
1435         kfree(ctx->table->name);
1436         kfree(ctx->table->udata);
1437         kfree(ctx->table);
1438 }
1439
1440 void nft_register_chain_type(const struct nft_chain_type *ctype)
1441 {
1442         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1443         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1444                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1445                 return;
1446         }
1447         chain_type[ctype->family][ctype->type] = ctype;
1448         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1449 }
1450 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1451
1452 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1453 {
1454         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1455         chain_type[ctype->family][ctype->type] = NULL;
1456         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1457 }
1458 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1459
1460 /*
1461  * Chains
1462  */
1463
1464 static struct nft_chain *
1465 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1466 {
1467         struct nft_chain *chain;
1468
1469         list_for_each_entry(chain, &table->chains, list) {
1470                 if (chain->handle == handle &&
1471                     nft_active_genmask(chain, genmask))
1472                         return chain;
1473         }
1474
1475         return ERR_PTR(-ENOENT);
1476 }
1477
1478 static bool lockdep_commit_lock_is_held(const struct net *net)
1479 {
1480 #ifdef CONFIG_PROVE_LOCKING
1481         struct nftables_pernet *nft_net = nft_pernet(net);
1482
1483         return lockdep_is_held(&nft_net->commit_mutex);
1484 #else
1485         return true;
1486 #endif
1487 }
1488
1489 static struct nft_chain *nft_chain_lookup(struct net *net,
1490                                           struct nft_table *table,
1491                                           const struct nlattr *nla, u8 genmask)
1492 {
1493         char search[NFT_CHAIN_MAXNAMELEN + 1];
1494         struct rhlist_head *tmp, *list;
1495         struct nft_chain *chain;
1496
1497         if (nla == NULL)
1498                 return ERR_PTR(-EINVAL);
1499
1500         nla_strscpy(search, nla, sizeof(search));
1501
1502         WARN_ON(!rcu_read_lock_held() &&
1503                 !lockdep_commit_lock_is_held(net));
1504
1505         chain = ERR_PTR(-ENOENT);
1506         rcu_read_lock();
1507         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1508         if (!list)
1509                 goto out_unlock;
1510
1511         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1512                 if (nft_active_genmask(chain, genmask))
1513                         goto out_unlock;
1514         }
1515         chain = ERR_PTR(-ENOENT);
1516 out_unlock:
1517         rcu_read_unlock();
1518         return chain;
1519 }
1520
1521 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1522         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1523                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1524         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1525         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1526                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1527         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1528         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1529         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1530                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1531         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1532         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1533         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1534         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1535                                     .len = NFT_USERDATA_MAXLEN },
1536 };
1537
1538 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1539         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1540         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1541         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1542                                     .len = IFNAMSIZ - 1 },
1543 };
1544
1545 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1546 {
1547         struct nft_stats *cpu_stats, total;
1548         struct nlattr *nest;
1549         unsigned int seq;
1550         u64 pkts, bytes;
1551         int cpu;
1552
1553         if (!stats)
1554                 return 0;
1555
1556         memset(&total, 0, sizeof(total));
1557         for_each_possible_cpu(cpu) {
1558                 cpu_stats = per_cpu_ptr(stats, cpu);
1559                 do {
1560                         seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1561                         pkts = cpu_stats->pkts;
1562                         bytes = cpu_stats->bytes;
1563                 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1564                 total.pkts += pkts;
1565                 total.bytes += bytes;
1566         }
1567         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1568         if (nest == NULL)
1569                 goto nla_put_failure;
1570
1571         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1572                          NFTA_COUNTER_PAD) ||
1573             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1574                          NFTA_COUNTER_PAD))
1575                 goto nla_put_failure;
1576
1577         nla_nest_end(skb, nest);
1578         return 0;
1579
1580 nla_put_failure:
1581         return -ENOSPC;
1582 }
1583
1584 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1585                                    const struct nft_base_chain *basechain,
1586                                    const struct list_head *hook_list)
1587 {
1588         const struct nf_hook_ops *ops = &basechain->ops;
1589         struct nft_hook *hook, *first = NULL;
1590         struct nlattr *nest, *nest_devs;
1591         int n = 0;
1592
1593         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1594         if (nest == NULL)
1595                 goto nla_put_failure;
1596         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1597                 goto nla_put_failure;
1598         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1599                 goto nla_put_failure;
1600
1601         if (nft_base_chain_netdev(family, ops->hooknum)) {
1602                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1603
1604                 if (!hook_list)
1605                         hook_list = &basechain->hook_list;
1606
1607                 list_for_each_entry(hook, hook_list, list) {
1608                         if (!first)
1609                                 first = hook;
1610
1611                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1612                                            hook->ops.dev->name))
1613                                 goto nla_put_failure;
1614                         n++;
1615                 }
1616                 nla_nest_end(skb, nest_devs);
1617
1618                 if (n == 1 &&
1619                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1620                         goto nla_put_failure;
1621         }
1622         nla_nest_end(skb, nest);
1623
1624         return 0;
1625 nla_put_failure:
1626         return -1;
1627 }
1628
1629 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1630                                      u32 portid, u32 seq, int event, u32 flags,
1631                                      int family, const struct nft_table *table,
1632                                      const struct nft_chain *chain,
1633                                      const struct list_head *hook_list)
1634 {
1635         struct nlmsghdr *nlh;
1636
1637         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1638         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1639                            NFNETLINK_V0, nft_base_seq(net));
1640         if (!nlh)
1641                 goto nla_put_failure;
1642
1643         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1644             nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1645             nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1646                          NFTA_CHAIN_PAD))
1647                 goto nla_put_failure;
1648
1649         if (event == NFT_MSG_DELCHAIN && !hook_list) {
1650                 nlmsg_end(skb, nlh);
1651                 return 0;
1652         }
1653
1654         if (nft_is_base_chain(chain)) {
1655                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1656                 struct nft_stats __percpu *stats;
1657
1658                 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1659                         goto nla_put_failure;
1660
1661                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1662                                  htonl(basechain->policy)))
1663                         goto nla_put_failure;
1664
1665                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1666                         goto nla_put_failure;
1667
1668                 stats = rcu_dereference_check(basechain->stats,
1669                                               lockdep_commit_lock_is_held(net));
1670                 if (nft_dump_stats(skb, stats))
1671                         goto nla_put_failure;
1672         }
1673
1674         if (chain->flags &&
1675             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1676                 goto nla_put_failure;
1677
1678         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1679                 goto nla_put_failure;
1680
1681         if (chain->udata &&
1682             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1683                 goto nla_put_failure;
1684
1685         nlmsg_end(skb, nlh);
1686         return 0;
1687
1688 nla_put_failure:
1689         nlmsg_trim(skb, nlh);
1690         return -1;
1691 }
1692
1693 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1694                                    const struct list_head *hook_list)
1695 {
1696         struct nftables_pernet *nft_net;
1697         struct sk_buff *skb;
1698         u16 flags = 0;
1699         int err;
1700
1701         if (!ctx->report &&
1702             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1703                 return;
1704
1705         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1706         if (skb == NULL)
1707                 goto err;
1708
1709         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1710                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1711
1712         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1713                                         event, flags, ctx->family, ctx->table,
1714                                         ctx->chain, hook_list);
1715         if (err < 0) {
1716                 kfree_skb(skb);
1717                 goto err;
1718         }
1719
1720         nft_net = nft_pernet(ctx->net);
1721         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1722         return;
1723 err:
1724         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1725 }
1726
1727 static int nf_tables_dump_chains(struct sk_buff *skb,
1728                                  struct netlink_callback *cb)
1729 {
1730         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1731         unsigned int idx = 0, s_idx = cb->args[0];
1732         struct net *net = sock_net(skb->sk);
1733         int family = nfmsg->nfgen_family;
1734         struct nftables_pernet *nft_net;
1735         const struct nft_table *table;
1736         const struct nft_chain *chain;
1737
1738         rcu_read_lock();
1739         nft_net = nft_pernet(net);
1740         cb->seq = READ_ONCE(nft_net->base_seq);
1741
1742         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1743                 if (family != NFPROTO_UNSPEC && family != table->family)
1744                         continue;
1745
1746                 list_for_each_entry_rcu(chain, &table->chains, list) {
1747                         if (idx < s_idx)
1748                                 goto cont;
1749                         if (idx > s_idx)
1750                                 memset(&cb->args[1], 0,
1751                                        sizeof(cb->args) - sizeof(cb->args[0]));
1752                         if (!nft_is_active(net, chain))
1753                                 continue;
1754                         if (nf_tables_fill_chain_info(skb, net,
1755                                                       NETLINK_CB(cb->skb).portid,
1756                                                       cb->nlh->nlmsg_seq,
1757                                                       NFT_MSG_NEWCHAIN,
1758                                                       NLM_F_MULTI,
1759                                                       table->family, table,
1760                                                       chain, NULL) < 0)
1761                                 goto done;
1762
1763                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1764 cont:
1765                         idx++;
1766                 }
1767         }
1768 done:
1769         rcu_read_unlock();
1770         cb->args[0] = idx;
1771         return skb->len;
1772 }
1773
1774 /* called with rcu_read_lock held */
1775 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1776                               const struct nlattr * const nla[])
1777 {
1778         struct netlink_ext_ack *extack = info->extack;
1779         u8 genmask = nft_genmask_cur(info->net);
1780         u8 family = info->nfmsg->nfgen_family;
1781         const struct nft_chain *chain;
1782         struct net *net = info->net;
1783         struct nft_table *table;
1784         struct sk_buff *skb2;
1785         int err;
1786
1787         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1788                 struct netlink_dump_control c = {
1789                         .dump = nf_tables_dump_chains,
1790                         .module = THIS_MODULE,
1791                 };
1792
1793                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1794         }
1795
1796         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1797         if (IS_ERR(table)) {
1798                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1799                 return PTR_ERR(table);
1800         }
1801
1802         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1803         if (IS_ERR(chain)) {
1804                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1805                 return PTR_ERR(chain);
1806         }
1807
1808         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1809         if (!skb2)
1810                 return -ENOMEM;
1811
1812         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1813                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1814                                         0, family, table, chain, NULL);
1815         if (err < 0)
1816                 goto err_fill_chain_info;
1817
1818         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1819
1820 err_fill_chain_info:
1821         kfree_skb(skb2);
1822         return err;
1823 }
1824
1825 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1826         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1827         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1828 };
1829
1830 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1831 {
1832         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1833         struct nft_stats __percpu *newstats;
1834         struct nft_stats *stats;
1835         int err;
1836
1837         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1838                                           nft_counter_policy, NULL);
1839         if (err < 0)
1840                 return ERR_PTR(err);
1841
1842         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1843                 return ERR_PTR(-EINVAL);
1844
1845         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1846         if (newstats == NULL)
1847                 return ERR_PTR(-ENOMEM);
1848
1849         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1850          * are not exposed to userspace.
1851          */
1852         preempt_disable();
1853         stats = this_cpu_ptr(newstats);
1854         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1855         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1856         preempt_enable();
1857
1858         return newstats;
1859 }
1860
1861 static void nft_chain_stats_replace(struct nft_trans *trans)
1862 {
1863         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1864
1865         if (!nft_trans_chain_stats(trans))
1866                 return;
1867
1868         nft_trans_chain_stats(trans) =
1869                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1870                                     lockdep_commit_lock_is_held(trans->ctx.net));
1871
1872         if (!nft_trans_chain_stats(trans))
1873                 static_branch_inc(&nft_counters_enabled);
1874 }
1875
1876 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1877 {
1878         struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
1879         struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
1880
1881         if (g0 != g1)
1882                 kvfree(g1);
1883         kvfree(g0);
1884
1885         /* should be NULL either via abort or via successful commit */
1886         WARN_ON_ONCE(chain->blob_next);
1887         kvfree(chain->blob_next);
1888 }
1889
1890 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1891 {
1892         struct nft_chain *chain = ctx->chain;
1893         struct nft_hook *hook, *next;
1894
1895         if (WARN_ON(chain->use > 0))
1896                 return;
1897
1898         /* no concurrent access possible anymore */
1899         nf_tables_chain_free_chain_rules(chain);
1900
1901         if (nft_is_base_chain(chain)) {
1902                 struct nft_base_chain *basechain = nft_base_chain(chain);
1903
1904                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1905                         list_for_each_entry_safe(hook, next,
1906                                                  &basechain->hook_list, list) {
1907                                 list_del_rcu(&hook->list);
1908                                 kfree_rcu(hook, rcu);
1909                         }
1910                 }
1911                 module_put(basechain->type->owner);
1912                 if (rcu_access_pointer(basechain->stats)) {
1913                         static_branch_dec(&nft_counters_enabled);
1914                         free_percpu(rcu_dereference_raw(basechain->stats));
1915                 }
1916                 kfree(chain->name);
1917                 kfree(chain->udata);
1918                 kfree(basechain);
1919         } else {
1920                 kfree(chain->name);
1921                 kfree(chain->udata);
1922                 kfree(chain);
1923         }
1924 }
1925
1926 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1927                                               const struct nlattr *attr)
1928 {
1929         struct net_device *dev;
1930         char ifname[IFNAMSIZ];
1931         struct nft_hook *hook;
1932         int err;
1933
1934         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
1935         if (!hook) {
1936                 err = -ENOMEM;
1937                 goto err_hook_alloc;
1938         }
1939
1940         nla_strscpy(ifname, attr, IFNAMSIZ);
1941         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1942          * indirectly serializing all the other holders of the commit_mutex with
1943          * the rtnl_mutex.
1944          */
1945         dev = __dev_get_by_name(net, ifname);
1946         if (!dev) {
1947                 err = -ENOENT;
1948                 goto err_hook_dev;
1949         }
1950         hook->ops.dev = dev;
1951
1952         return hook;
1953
1954 err_hook_dev:
1955         kfree(hook);
1956 err_hook_alloc:
1957         return ERR_PTR(err);
1958 }
1959
1960 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1961                                            const struct nft_hook *this)
1962 {
1963         struct nft_hook *hook;
1964
1965         list_for_each_entry(hook, hook_list, list) {
1966                 if (this->ops.dev == hook->ops.dev)
1967                         return hook;
1968         }
1969
1970         return NULL;
1971 }
1972
1973 static int nf_tables_parse_netdev_hooks(struct net *net,
1974                                         const struct nlattr *attr,
1975                                         struct list_head *hook_list,
1976                                         struct netlink_ext_ack *extack)
1977 {
1978         struct nft_hook *hook, *next;
1979         const struct nlattr *tmp;
1980         int rem, n = 0, err;
1981
1982         nla_for_each_nested(tmp, attr, rem) {
1983                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1984                         err = -EINVAL;
1985                         goto err_hook;
1986                 }
1987
1988                 hook = nft_netdev_hook_alloc(net, tmp);
1989                 if (IS_ERR(hook)) {
1990                         NL_SET_BAD_ATTR(extack, tmp);
1991                         err = PTR_ERR(hook);
1992                         goto err_hook;
1993                 }
1994                 if (nft_hook_list_find(hook_list, hook)) {
1995                         NL_SET_BAD_ATTR(extack, tmp);
1996                         kfree(hook);
1997                         err = -EEXIST;
1998                         goto err_hook;
1999                 }
2000                 list_add_tail(&hook->list, hook_list);
2001                 n++;
2002
2003                 if (n == NFT_NETDEVICE_MAX) {
2004                         err = -EFBIG;
2005                         goto err_hook;
2006                 }
2007         }
2008
2009         return 0;
2010
2011 err_hook:
2012         list_for_each_entry_safe(hook, next, hook_list, list) {
2013                 list_del(&hook->list);
2014                 kfree(hook);
2015         }
2016         return err;
2017 }
2018
2019 struct nft_chain_hook {
2020         u32                             num;
2021         s32                             priority;
2022         const struct nft_chain_type     *type;
2023         struct list_head                list;
2024 };
2025
2026 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2027                                   struct list_head *hook_list,
2028                                   struct netlink_ext_ack *extack, u32 flags)
2029 {
2030         struct nft_hook *hook;
2031         int err;
2032
2033         if (tb[NFTA_HOOK_DEV]) {
2034                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2035                 if (IS_ERR(hook)) {
2036                         NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2037                         return PTR_ERR(hook);
2038                 }
2039
2040                 list_add_tail(&hook->list, hook_list);
2041         } else if (tb[NFTA_HOOK_DEVS]) {
2042                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2043                                                    hook_list, extack);
2044                 if (err < 0)
2045                         return err;
2046
2047         }
2048
2049         if (flags & NFT_CHAIN_HW_OFFLOAD &&
2050             list_empty(hook_list))
2051                 return -EINVAL;
2052
2053         return 0;
2054 }
2055
2056 static int nft_chain_parse_hook(struct net *net,
2057                                 struct nft_base_chain *basechain,
2058                                 const struct nlattr * const nla[],
2059                                 struct nft_chain_hook *hook, u8 family,
2060                                 u32 flags, struct netlink_ext_ack *extack)
2061 {
2062         struct nftables_pernet *nft_net = nft_pernet(net);
2063         struct nlattr *ha[NFTA_HOOK_MAX + 1];
2064         const struct nft_chain_type *type;
2065         int err;
2066
2067         lockdep_assert_held(&nft_net->commit_mutex);
2068         lockdep_nfnl_nft_mutex_not_held();
2069
2070         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2071                                           nla[NFTA_CHAIN_HOOK],
2072                                           nft_hook_policy, NULL);
2073         if (err < 0)
2074                 return err;
2075
2076         if (!basechain) {
2077                 if (!ha[NFTA_HOOK_HOOKNUM] ||
2078                     !ha[NFTA_HOOK_PRIORITY])
2079                         return -EINVAL;
2080
2081                 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2082                 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2083
2084                 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2085                 if (!type)
2086                         return -EOPNOTSUPP;
2087
2088                 if (nla[NFTA_CHAIN_TYPE]) {
2089                         type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2090                                                            family, true);
2091                         if (IS_ERR(type)) {
2092                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2093                                 return PTR_ERR(type);
2094                         }
2095                 }
2096                 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2097                         return -EOPNOTSUPP;
2098
2099                 if (type->type == NFT_CHAIN_T_NAT &&
2100                     hook->priority <= NF_IP_PRI_CONNTRACK)
2101                         return -EOPNOTSUPP;
2102         } else {
2103                 if (ha[NFTA_HOOK_HOOKNUM]) {
2104                         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2105                         if (hook->num != basechain->ops.hooknum)
2106                                 return -EOPNOTSUPP;
2107                 }
2108                 if (ha[NFTA_HOOK_PRIORITY]) {
2109                         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2110                         if (hook->priority != basechain->ops.priority)
2111                                 return -EOPNOTSUPP;
2112                 }
2113
2114                 type = basechain->type;
2115         }
2116
2117         if (!try_module_get(type->owner)) {
2118                 if (nla[NFTA_CHAIN_TYPE])
2119                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2120                 return -ENOENT;
2121         }
2122
2123         hook->type = type;
2124
2125         INIT_LIST_HEAD(&hook->list);
2126         if (nft_base_chain_netdev(family, hook->num)) {
2127                 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2128                 if (err < 0) {
2129                         module_put(type->owner);
2130                         return err;
2131                 }
2132         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2133                 module_put(type->owner);
2134                 return -EOPNOTSUPP;
2135         }
2136
2137         return 0;
2138 }
2139
2140 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2141 {
2142         struct nft_hook *h, *next;
2143
2144         list_for_each_entry_safe(h, next, &hook->list, list) {
2145                 list_del(&h->list);
2146                 kfree(h);
2147         }
2148         module_put(hook->type->owner);
2149 }
2150
2151 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2152 {
2153         struct nft_rule_dp_last *lrule;
2154
2155         BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2156
2157         lrule = (struct nft_rule_dp_last *)ptr;
2158         lrule->end.is_last = 1;
2159         lrule->chain = chain;
2160         /* blob size does not include the trailer rule */
2161 }
2162
2163 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2164                                                          unsigned int size)
2165 {
2166         struct nft_rule_blob *blob;
2167
2168         if (size > INT_MAX)
2169                 return NULL;
2170
2171         size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2172
2173         blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2174         if (!blob)
2175                 return NULL;
2176
2177         blob->size = 0;
2178         nft_last_rule(chain, blob->data);
2179
2180         return blob;
2181 }
2182
2183 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2184                                     const struct nft_chain_hook *hook,
2185                                     struct nft_chain *chain)
2186 {
2187         ops->pf                 = family;
2188         ops->hooknum            = hook->num;
2189         ops->priority           = hook->priority;
2190         ops->priv               = chain;
2191         ops->hook               = hook->type->hooks[ops->hooknum];
2192         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2193 }
2194
2195 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2196                               struct nft_chain_hook *hook, u32 flags)
2197 {
2198         struct nft_chain *chain;
2199         struct nft_hook *h;
2200
2201         basechain->type = hook->type;
2202         INIT_LIST_HEAD(&basechain->hook_list);
2203         chain = &basechain->chain;
2204
2205         if (nft_base_chain_netdev(family, hook->num)) {
2206                 list_splice_init(&hook->list, &basechain->hook_list);
2207                 list_for_each_entry(h, &basechain->hook_list, list)
2208                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2209         }
2210         nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2211
2212         chain->flags |= NFT_CHAIN_BASE | flags;
2213         basechain->policy = NF_ACCEPT;
2214         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2215             !nft_chain_offload_support(basechain)) {
2216                 list_splice_init(&basechain->hook_list, &hook->list);
2217                 return -EOPNOTSUPP;
2218         }
2219
2220         flow_block_init(&basechain->flow_block);
2221
2222         return 0;
2223 }
2224
2225 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2226 {
2227         int err;
2228
2229         err = rhltable_insert_key(&table->chains_ht, chain->name,
2230                                   &chain->rhlhead, nft_chain_ht_params);
2231         if (err)
2232                 return err;
2233
2234         list_add_tail_rcu(&chain->list, &table->chains);
2235
2236         return 0;
2237 }
2238
2239 static u64 chain_id;
2240
2241 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2242                               u8 policy, u32 flags,
2243                               struct netlink_ext_ack *extack)
2244 {
2245         const struct nlattr * const *nla = ctx->nla;
2246         struct nft_table *table = ctx->table;
2247         struct nft_base_chain *basechain;
2248         struct net *net = ctx->net;
2249         char name[NFT_NAME_MAXLEN];
2250         struct nft_rule_blob *blob;
2251         struct nft_trans *trans;
2252         struct nft_chain *chain;
2253         int err;
2254
2255         if (table->use == UINT_MAX)
2256                 return -EOVERFLOW;
2257
2258         if (nla[NFTA_CHAIN_HOOK]) {
2259                 struct nft_stats __percpu *stats = NULL;
2260                 struct nft_chain_hook hook = {};
2261
2262                 if (flags & NFT_CHAIN_BINDING)
2263                         return -EOPNOTSUPP;
2264
2265                 err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2266                                            extack);
2267                 if (err < 0)
2268                         return err;
2269
2270                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2271                 if (basechain == NULL) {
2272                         nft_chain_release_hook(&hook);
2273                         return -ENOMEM;
2274                 }
2275                 chain = &basechain->chain;
2276
2277                 if (nla[NFTA_CHAIN_COUNTERS]) {
2278                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2279                         if (IS_ERR(stats)) {
2280                                 nft_chain_release_hook(&hook);
2281                                 kfree(basechain);
2282                                 return PTR_ERR(stats);
2283                         }
2284                         rcu_assign_pointer(basechain->stats, stats);
2285                 }
2286
2287                 err = nft_basechain_init(basechain, family, &hook, flags);
2288                 if (err < 0) {
2289                         nft_chain_release_hook(&hook);
2290                         kfree(basechain);
2291                         free_percpu(stats);
2292                         return err;
2293                 }
2294                 if (stats)
2295                         static_branch_inc(&nft_counters_enabled);
2296         } else {
2297                 if (flags & NFT_CHAIN_BASE)
2298                         return -EINVAL;
2299                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2300                         return -EOPNOTSUPP;
2301
2302                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2303                 if (chain == NULL)
2304                         return -ENOMEM;
2305
2306                 chain->flags = flags;
2307         }
2308         ctx->chain = chain;
2309
2310         INIT_LIST_HEAD(&chain->rules);
2311         chain->handle = nf_tables_alloc_handle(table);
2312         chain->table = table;
2313
2314         if (nla[NFTA_CHAIN_NAME]) {
2315                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2316         } else {
2317                 if (!(flags & NFT_CHAIN_BINDING)) {
2318                         err = -EINVAL;
2319                         goto err_destroy_chain;
2320                 }
2321
2322                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2323                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2324         }
2325
2326         if (!chain->name) {
2327                 err = -ENOMEM;
2328                 goto err_destroy_chain;
2329         }
2330
2331         if (nla[NFTA_CHAIN_USERDATA]) {
2332                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2333                 if (chain->udata == NULL) {
2334                         err = -ENOMEM;
2335                         goto err_destroy_chain;
2336                 }
2337                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2338         }
2339
2340         blob = nf_tables_chain_alloc_rules(chain, 0);
2341         if (!blob) {
2342                 err = -ENOMEM;
2343                 goto err_destroy_chain;
2344         }
2345
2346         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2347         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2348
2349         err = nf_tables_register_hook(net, table, chain);
2350         if (err < 0)
2351                 goto err_destroy_chain;
2352
2353         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2354         if (IS_ERR(trans)) {
2355                 err = PTR_ERR(trans);
2356                 goto err_unregister_hook;
2357         }
2358
2359         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2360         if (nft_is_base_chain(chain))
2361                 nft_trans_chain_policy(trans) = policy;
2362
2363         err = nft_chain_add(table, chain);
2364         if (err < 0) {
2365                 nft_trans_destroy(trans);
2366                 goto err_unregister_hook;
2367         }
2368
2369         table->use++;
2370
2371         return 0;
2372 err_unregister_hook:
2373         nf_tables_unregister_hook(net, table, chain);
2374 err_destroy_chain:
2375         nf_tables_chain_destroy(ctx);
2376
2377         return err;
2378 }
2379
2380 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2381                               u32 flags, const struct nlattr *attr,
2382                               struct netlink_ext_ack *extack)
2383 {
2384         const struct nlattr * const *nla = ctx->nla;
2385         struct nft_base_chain *basechain = NULL;
2386         struct nft_table *table = ctx->table;
2387         struct nft_chain *chain = ctx->chain;
2388         struct nft_chain_hook hook = {};
2389         struct nft_stats *stats = NULL;
2390         struct nft_hook *h, *next;
2391         struct nf_hook_ops *ops;
2392         struct nft_trans *trans;
2393         bool unregister = false;
2394         int err;
2395
2396         if (chain->flags ^ flags)
2397                 return -EOPNOTSUPP;
2398
2399         INIT_LIST_HEAD(&hook.list);
2400
2401         if (nla[NFTA_CHAIN_HOOK]) {
2402                 if (!nft_is_base_chain(chain)) {
2403                         NL_SET_BAD_ATTR(extack, attr);
2404                         return -EEXIST;
2405                 }
2406
2407                 basechain = nft_base_chain(chain);
2408                 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2409                                            ctx->family, flags, extack);
2410                 if (err < 0)
2411                         return err;
2412
2413                 if (basechain->type != hook.type) {
2414                         nft_chain_release_hook(&hook);
2415                         NL_SET_BAD_ATTR(extack, attr);
2416                         return -EEXIST;
2417                 }
2418
2419                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2420                         list_for_each_entry_safe(h, next, &hook.list, list) {
2421                                 h->ops.pf       = basechain->ops.pf;
2422                                 h->ops.hooknum  = basechain->ops.hooknum;
2423                                 h->ops.priority = basechain->ops.priority;
2424                                 h->ops.priv     = basechain->ops.priv;
2425                                 h->ops.hook     = basechain->ops.hook;
2426
2427                                 if (nft_hook_list_find(&basechain->hook_list, h)) {
2428                                         list_del(&h->list);
2429                                         kfree(h);
2430                                 }
2431                         }
2432                 } else {
2433                         ops = &basechain->ops;
2434                         if (ops->hooknum != hook.num ||
2435                             ops->priority != hook.priority) {
2436                                 nft_chain_release_hook(&hook);
2437                                 NL_SET_BAD_ATTR(extack, attr);
2438                                 return -EEXIST;
2439                         }
2440                 }
2441         }
2442
2443         if (nla[NFTA_CHAIN_HANDLE] &&
2444             nla[NFTA_CHAIN_NAME]) {
2445                 struct nft_chain *chain2;
2446
2447                 chain2 = nft_chain_lookup(ctx->net, table,
2448                                           nla[NFTA_CHAIN_NAME], genmask);
2449                 if (!IS_ERR(chain2)) {
2450                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2451                         err = -EEXIST;
2452                         goto err_hooks;
2453                 }
2454         }
2455
2456         if (nla[NFTA_CHAIN_COUNTERS]) {
2457                 if (!nft_is_base_chain(chain)) {
2458                         err = -EOPNOTSUPP;
2459                         goto err_hooks;
2460                 }
2461
2462                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2463                 if (IS_ERR(stats)) {
2464                         err = PTR_ERR(stats);
2465                         goto err_hooks;
2466                 }
2467         }
2468
2469         if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2470             nft_is_base_chain(chain) &&
2471             !list_empty(&hook.list)) {
2472                 basechain = nft_base_chain(chain);
2473                 ops = &basechain->ops;
2474
2475                 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2476                         err = nft_netdev_register_hooks(ctx->net, &hook.list);
2477                         if (err < 0)
2478                                 goto err_hooks;
2479                 }
2480         }
2481
2482         unregister = true;
2483         err = -ENOMEM;
2484         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2485                                 sizeof(struct nft_trans_chain));
2486         if (trans == NULL)
2487                 goto err_trans;
2488
2489         nft_trans_chain_stats(trans) = stats;
2490         nft_trans_chain_update(trans) = true;
2491
2492         if (nla[NFTA_CHAIN_POLICY])
2493                 nft_trans_chain_policy(trans) = policy;
2494         else
2495                 nft_trans_chain_policy(trans) = -1;
2496
2497         if (nla[NFTA_CHAIN_HANDLE] &&
2498             nla[NFTA_CHAIN_NAME]) {
2499                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2500                 struct nft_trans *tmp;
2501                 char *name;
2502
2503                 err = -ENOMEM;
2504                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2505                 if (!name)
2506                         goto err_trans;
2507
2508                 err = -EEXIST;
2509                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2510                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2511                             tmp->ctx.table == table &&
2512                             nft_trans_chain_update(tmp) &&
2513                             nft_trans_chain_name(tmp) &&
2514                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2515                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2516                                 kfree(name);
2517                                 goto err_trans;
2518                         }
2519                 }
2520
2521                 nft_trans_chain_name(trans) = name;
2522         }
2523
2524         nft_trans_basechain(trans) = basechain;
2525         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2526         list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2527
2528         nft_trans_commit_list_add_tail(ctx->net, trans);
2529
2530         return 0;
2531
2532 err_trans:
2533         free_percpu(stats);
2534         kfree(trans);
2535 err_hooks:
2536         if (nla[NFTA_CHAIN_HOOK]) {
2537                 list_for_each_entry_safe(h, next, &hook.list, list) {
2538                         if (unregister)
2539                                 nf_unregister_net_hook(ctx->net, &h->ops);
2540                         list_del(&h->list);
2541                         kfree_rcu(h, rcu);
2542                 }
2543                 module_put(hook.type->owner);
2544         }
2545
2546         return err;
2547 }
2548
2549 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2550                                                const struct nft_table *table,
2551                                                const struct nlattr *nla)
2552 {
2553         struct nftables_pernet *nft_net = nft_pernet(net);
2554         u32 id = ntohl(nla_get_be32(nla));
2555         struct nft_trans *trans;
2556
2557         list_for_each_entry(trans, &nft_net->commit_list, list) {
2558                 struct nft_chain *chain = trans->ctx.chain;
2559
2560                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2561                     chain->table == table &&
2562                     id == nft_trans_chain_id(trans))
2563                         return chain;
2564         }
2565         return ERR_PTR(-ENOENT);
2566 }
2567
2568 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2569                               const struct nlattr * const nla[])
2570 {
2571         struct nftables_pernet *nft_net = nft_pernet(info->net);
2572         struct netlink_ext_ack *extack = info->extack;
2573         u8 genmask = nft_genmask_next(info->net);
2574         u8 family = info->nfmsg->nfgen_family;
2575         struct nft_chain *chain = NULL;
2576         struct net *net = info->net;
2577         const struct nlattr *attr;
2578         struct nft_table *table;
2579         u8 policy = NF_ACCEPT;
2580         struct nft_ctx ctx;
2581         u64 handle = 0;
2582         u32 flags = 0;
2583
2584         lockdep_assert_held(&nft_net->commit_mutex);
2585
2586         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2587                                  NETLINK_CB(skb).portid);
2588         if (IS_ERR(table)) {
2589                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2590                 return PTR_ERR(table);
2591         }
2592
2593         chain = NULL;
2594         attr = nla[NFTA_CHAIN_NAME];
2595
2596         if (nla[NFTA_CHAIN_HANDLE]) {
2597                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2598                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2599                 if (IS_ERR(chain)) {
2600                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2601                         return PTR_ERR(chain);
2602                 }
2603                 attr = nla[NFTA_CHAIN_HANDLE];
2604         } else if (nla[NFTA_CHAIN_NAME]) {
2605                 chain = nft_chain_lookup(net, table, attr, genmask);
2606                 if (IS_ERR(chain)) {
2607                         if (PTR_ERR(chain) != -ENOENT) {
2608                                 NL_SET_BAD_ATTR(extack, attr);
2609                                 return PTR_ERR(chain);
2610                         }
2611                         chain = NULL;
2612                 }
2613         } else if (!nla[NFTA_CHAIN_ID]) {
2614                 return -EINVAL;
2615         }
2616
2617         if (nla[NFTA_CHAIN_POLICY]) {
2618                 if (chain != NULL &&
2619                     !nft_is_base_chain(chain)) {
2620                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2621                         return -EOPNOTSUPP;
2622                 }
2623
2624                 if (chain == NULL &&
2625                     nla[NFTA_CHAIN_HOOK] == NULL) {
2626                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2627                         return -EOPNOTSUPP;
2628                 }
2629
2630                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2631                 switch (policy) {
2632                 case NF_DROP:
2633                 case NF_ACCEPT:
2634                         break;
2635                 default:
2636                         return -EINVAL;
2637                 }
2638         }
2639
2640         if (nla[NFTA_CHAIN_FLAGS])
2641                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2642         else if (chain)
2643                 flags = chain->flags;
2644
2645         if (flags & ~NFT_CHAIN_FLAGS)
2646                 return -EOPNOTSUPP;
2647
2648         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2649
2650         if (chain != NULL) {
2651                 if (chain->flags & NFT_CHAIN_BINDING)
2652                         return -EINVAL;
2653
2654                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2655                         NL_SET_BAD_ATTR(extack, attr);
2656                         return -EEXIST;
2657                 }
2658                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2659                         return -EOPNOTSUPP;
2660
2661                 flags |= chain->flags & NFT_CHAIN_BASE;
2662                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2663                                           extack);
2664         }
2665
2666         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2667 }
2668
2669 static int nft_delchain_hook(struct nft_ctx *ctx, struct nft_chain *chain,
2670                              struct netlink_ext_ack *extack)
2671 {
2672         const struct nlattr * const *nla = ctx->nla;
2673         struct nft_chain_hook chain_hook = {};
2674         struct nft_base_chain *basechain;
2675         struct nft_hook *this, *hook;
2676         LIST_HEAD(chain_del_list);
2677         struct nft_trans *trans;
2678         int err;
2679
2680         if (!nft_is_base_chain(chain))
2681                 return -EOPNOTSUPP;
2682
2683         basechain = nft_base_chain(chain);
2684         err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2685                                    ctx->family, chain->flags, extack);
2686         if (err < 0)
2687                 return err;
2688
2689         list_for_each_entry(this, &chain_hook.list, list) {
2690                 hook = nft_hook_list_find(&basechain->hook_list, this);
2691                 if (!hook) {
2692                         err = -ENOENT;
2693                         goto err_chain_del_hook;
2694                 }
2695                 list_move(&hook->list, &chain_del_list);
2696         }
2697
2698         trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2699                                 sizeof(struct nft_trans_chain));
2700         if (!trans) {
2701                 err = -ENOMEM;
2702                 goto err_chain_del_hook;
2703         }
2704
2705         nft_trans_basechain(trans) = basechain;
2706         nft_trans_chain_update(trans) = true;
2707         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2708         list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2709         nft_chain_release_hook(&chain_hook);
2710
2711         nft_trans_commit_list_add_tail(ctx->net, trans);
2712
2713         return 0;
2714
2715 err_chain_del_hook:
2716         list_splice(&chain_del_list, &basechain->hook_list);
2717         nft_chain_release_hook(&chain_hook);
2718
2719         return err;
2720 }
2721
2722 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2723                               const struct nlattr * const nla[])
2724 {
2725         struct netlink_ext_ack *extack = info->extack;
2726         u8 genmask = nft_genmask_next(info->net);
2727         u8 family = info->nfmsg->nfgen_family;
2728         struct net *net = info->net;
2729         const struct nlattr *attr;
2730         struct nft_table *table;
2731         struct nft_chain *chain;
2732         struct nft_rule *rule;
2733         struct nft_ctx ctx;
2734         u64 handle;
2735         u32 use;
2736         int err;
2737
2738         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2739                                  NETLINK_CB(skb).portid);
2740         if (IS_ERR(table)) {
2741                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2742                 return PTR_ERR(table);
2743         }
2744
2745         if (nla[NFTA_CHAIN_HANDLE]) {
2746                 attr = nla[NFTA_CHAIN_HANDLE];
2747                 handle = be64_to_cpu(nla_get_be64(attr));
2748                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2749         } else {
2750                 attr = nla[NFTA_CHAIN_NAME];
2751                 chain = nft_chain_lookup(net, table, attr, genmask);
2752         }
2753         if (IS_ERR(chain)) {
2754                 if (PTR_ERR(chain) == -ENOENT &&
2755                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2756                         return 0;
2757
2758                 NL_SET_BAD_ATTR(extack, attr);
2759                 return PTR_ERR(chain);
2760         }
2761
2762         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2763
2764         if (nla[NFTA_CHAIN_HOOK]) {
2765                 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2766                         return -EOPNOTSUPP;
2767
2768                 return nft_delchain_hook(&ctx, chain, extack);
2769         }
2770
2771         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2772             chain->use > 0)
2773                 return -EBUSY;
2774
2775         use = chain->use;
2776         list_for_each_entry(rule, &chain->rules, list) {
2777                 if (!nft_is_active_next(net, rule))
2778                         continue;
2779                 use--;
2780
2781                 err = nft_delrule(&ctx, rule);
2782                 if (err < 0)
2783                         return err;
2784         }
2785
2786         /* There are rules and elements that are still holding references to us,
2787          * we cannot do a recursive removal in this case.
2788          */
2789         if (use > 0) {
2790                 NL_SET_BAD_ATTR(extack, attr);
2791                 return -EBUSY;
2792         }
2793
2794         return nft_delchain(&ctx);
2795 }
2796
2797 /*
2798  * Expressions
2799  */
2800
2801 /**
2802  *      nft_register_expr - register nf_tables expr type
2803  *      @type: expr type
2804  *
2805  *      Registers the expr type for use with nf_tables. Returns zero on
2806  *      success or a negative errno code otherwise.
2807  */
2808 int nft_register_expr(struct nft_expr_type *type)
2809 {
2810         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2811         if (type->family == NFPROTO_UNSPEC)
2812                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2813         else
2814                 list_add_rcu(&type->list, &nf_tables_expressions);
2815         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2816         return 0;
2817 }
2818 EXPORT_SYMBOL_GPL(nft_register_expr);
2819
2820 /**
2821  *      nft_unregister_expr - unregister nf_tables expr type
2822  *      @type: expr type
2823  *
2824  *      Unregisters the expr typefor use with nf_tables.
2825  */
2826 void nft_unregister_expr(struct nft_expr_type *type)
2827 {
2828         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2829         list_del_rcu(&type->list);
2830         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2831 }
2832 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2833
2834 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2835                                                        struct nlattr *nla)
2836 {
2837         const struct nft_expr_type *type, *candidate = NULL;
2838
2839         list_for_each_entry(type, &nf_tables_expressions, list) {
2840                 if (!nla_strcmp(nla, type->name)) {
2841                         if (!type->family && !candidate)
2842                                 candidate = type;
2843                         else if (type->family == family)
2844                                 candidate = type;
2845                 }
2846         }
2847         return candidate;
2848 }
2849
2850 #ifdef CONFIG_MODULES
2851 static int nft_expr_type_request_module(struct net *net, u8 family,
2852                                         struct nlattr *nla)
2853 {
2854         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2855                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2856                 return -EAGAIN;
2857
2858         return 0;
2859 }
2860 #endif
2861
2862 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2863                                                      u8 family,
2864                                                      struct nlattr *nla)
2865 {
2866         const struct nft_expr_type *type;
2867
2868         if (nla == NULL)
2869                 return ERR_PTR(-EINVAL);
2870
2871         type = __nft_expr_type_get(family, nla);
2872         if (type != NULL && try_module_get(type->owner))
2873                 return type;
2874
2875         lockdep_nfnl_nft_mutex_not_held();
2876 #ifdef CONFIG_MODULES
2877         if (type == NULL) {
2878                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2879                         return ERR_PTR(-EAGAIN);
2880
2881                 if (nft_request_module(net, "nft-expr-%.*s",
2882                                        nla_len(nla),
2883                                        (char *)nla_data(nla)) == -EAGAIN)
2884                         return ERR_PTR(-EAGAIN);
2885         }
2886 #endif
2887         return ERR_PTR(-ENOENT);
2888 }
2889
2890 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2891         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2892                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2893         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2894 };
2895
2896 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2897                                     const struct nft_expr *expr, bool reset)
2898 {
2899         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2900                 goto nla_put_failure;
2901
2902         if (expr->ops->dump) {
2903                 struct nlattr *data = nla_nest_start_noflag(skb,
2904                                                             NFTA_EXPR_DATA);
2905                 if (data == NULL)
2906                         goto nla_put_failure;
2907                 if (expr->ops->dump(skb, expr, reset) < 0)
2908                         goto nla_put_failure;
2909                 nla_nest_end(skb, data);
2910         }
2911
2912         return skb->len;
2913
2914 nla_put_failure:
2915         return -1;
2916 };
2917
2918 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2919                   const struct nft_expr *expr, bool reset)
2920 {
2921         struct nlattr *nest;
2922
2923         nest = nla_nest_start_noflag(skb, attr);
2924         if (!nest)
2925                 goto nla_put_failure;
2926         if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
2927                 goto nla_put_failure;
2928         nla_nest_end(skb, nest);
2929         return 0;
2930
2931 nla_put_failure:
2932         return -1;
2933 }
2934
2935 struct nft_expr_info {
2936         const struct nft_expr_ops       *ops;
2937         const struct nlattr             *attr;
2938         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2939 };
2940
2941 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2942                                 const struct nlattr *nla,
2943                                 struct nft_expr_info *info)
2944 {
2945         const struct nft_expr_type *type;
2946         const struct nft_expr_ops *ops;
2947         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2948         int err;
2949
2950         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2951                                           nft_expr_policy, NULL);
2952         if (err < 0)
2953                 return err;
2954
2955         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2956         if (IS_ERR(type))
2957                 return PTR_ERR(type);
2958
2959         if (tb[NFTA_EXPR_DATA]) {
2960                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2961                                                   tb[NFTA_EXPR_DATA],
2962                                                   type->policy, NULL);
2963                 if (err < 0)
2964                         goto err1;
2965         } else
2966                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2967
2968         if (type->select_ops != NULL) {
2969                 ops = type->select_ops(ctx,
2970                                        (const struct nlattr * const *)info->tb);
2971                 if (IS_ERR(ops)) {
2972                         err = PTR_ERR(ops);
2973 #ifdef CONFIG_MODULES
2974                         if (err == -EAGAIN)
2975                                 if (nft_expr_type_request_module(ctx->net,
2976                                                                  ctx->family,
2977                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2978                                         err = -ENOENT;
2979 #endif
2980                         goto err1;
2981                 }
2982         } else
2983                 ops = type->ops;
2984
2985         info->attr = nla;
2986         info->ops = ops;
2987
2988         return 0;
2989
2990 err1:
2991         module_put(type->owner);
2992         return err;
2993 }
2994
2995 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
2996                          struct nft_expr_info *info)
2997 {
2998         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2999         const struct nft_expr_type *type;
3000         int err;
3001
3002         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3003                                           nft_expr_policy, NULL);
3004         if (err < 0)
3005                 return err;
3006
3007         if (!tb[NFTA_EXPR_DATA])
3008                 return -EINVAL;
3009
3010         type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3011         if (!type)
3012                 return -ENOENT;
3013
3014         if (!type->inner_ops)
3015                 return -EOPNOTSUPP;
3016
3017         err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3018                                           tb[NFTA_EXPR_DATA],
3019                                           type->policy, NULL);
3020         if (err < 0)
3021                 goto err_nla_parse;
3022
3023         info->attr = nla;
3024         info->ops = type->inner_ops;
3025
3026         return 0;
3027
3028 err_nla_parse:
3029         return err;
3030 }
3031
3032 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3033                              const struct nft_expr_info *expr_info,
3034                              struct nft_expr *expr)
3035 {
3036         const struct nft_expr_ops *ops = expr_info->ops;
3037         int err;
3038
3039         expr->ops = ops;
3040         if (ops->init) {
3041                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3042                 if (err < 0)
3043                         goto err1;
3044         }
3045
3046         return 0;
3047 err1:
3048         expr->ops = NULL;
3049         return err;
3050 }
3051
3052 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3053                                    struct nft_expr *expr)
3054 {
3055         const struct nft_expr_type *type = expr->ops->type;
3056
3057         if (expr->ops->destroy)
3058                 expr->ops->destroy(ctx, expr);
3059         module_put(type->owner);
3060 }
3061
3062 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3063                                       const struct nlattr *nla)
3064 {
3065         struct nft_expr_info expr_info;
3066         struct nft_expr *expr;
3067         struct module *owner;
3068         int err;
3069
3070         err = nf_tables_expr_parse(ctx, nla, &expr_info);
3071         if (err < 0)
3072                 goto err_expr_parse;
3073
3074         err = -EOPNOTSUPP;
3075         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3076                 goto err_expr_stateful;
3077
3078         err = -ENOMEM;
3079         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3080         if (expr == NULL)
3081                 goto err_expr_stateful;
3082
3083         err = nf_tables_newexpr(ctx, &expr_info, expr);
3084         if (err < 0)
3085                 goto err_expr_new;
3086
3087         return expr;
3088 err_expr_new:
3089         kfree(expr);
3090 err_expr_stateful:
3091         owner = expr_info.ops->type->owner;
3092         if (expr_info.ops->type->release_ops)
3093                 expr_info.ops->type->release_ops(expr_info.ops);
3094
3095         module_put(owner);
3096 err_expr_parse:
3097         return ERR_PTR(err);
3098 }
3099
3100 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3101 {
3102         int err;
3103
3104         if (src->ops->clone) {
3105                 dst->ops = src->ops;
3106                 err = src->ops->clone(dst, src);
3107                 if (err < 0)
3108                         return err;
3109         } else {
3110                 memcpy(dst, src, src->ops->size);
3111         }
3112
3113         __module_get(src->ops->type->owner);
3114
3115         return 0;
3116 }
3117
3118 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3119 {
3120         nf_tables_expr_destroy(ctx, expr);
3121         kfree(expr);
3122 }
3123
3124 /*
3125  * Rules
3126  */
3127
3128 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3129                                           u64 handle)
3130 {
3131         struct nft_rule *rule;
3132
3133         // FIXME: this sucks
3134         list_for_each_entry_rcu(rule, &chain->rules, list) {
3135                 if (handle == rule->handle)
3136                         return rule;
3137         }
3138
3139         return ERR_PTR(-ENOENT);
3140 }
3141
3142 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3143                                         const struct nlattr *nla)
3144 {
3145         if (nla == NULL)
3146                 return ERR_PTR(-EINVAL);
3147
3148         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3149 }
3150
3151 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3152         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
3153                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
3154         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
3155                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
3156         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
3157         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3158         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
3159         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
3160         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
3161                                     .len = NFT_USERDATA_MAXLEN },
3162         [NFTA_RULE_ID]          = { .type = NLA_U32 },
3163         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3164         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
3165 };
3166
3167 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3168                                     u32 portid, u32 seq, int event,
3169                                     u32 flags, int family,
3170                                     const struct nft_table *table,
3171                                     const struct nft_chain *chain,
3172                                     const struct nft_rule *rule, u64 handle,
3173                                     bool reset)
3174 {
3175         struct nlmsghdr *nlh;
3176         const struct nft_expr *expr, *next;
3177         struct nlattr *list;
3178         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3179
3180         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3181                            nft_base_seq(net));
3182         if (!nlh)
3183                 goto nla_put_failure;
3184
3185         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3186                 goto nla_put_failure;
3187         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3188                 goto nla_put_failure;
3189         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3190                          NFTA_RULE_PAD))
3191                 goto nla_put_failure;
3192
3193         if (event != NFT_MSG_DELRULE && handle) {
3194                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3195                                  NFTA_RULE_PAD))
3196                         goto nla_put_failure;
3197         }
3198
3199         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3200                 nft_flow_rule_stats(chain, rule);
3201
3202         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3203         if (list == NULL)
3204                 goto nla_put_failure;
3205         nft_rule_for_each_expr(expr, next, rule) {
3206                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3207                         goto nla_put_failure;
3208         }
3209         nla_nest_end(skb, list);
3210
3211         if (rule->udata) {
3212                 struct nft_userdata *udata = nft_userdata(rule);
3213                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3214                             udata->data) < 0)
3215                         goto nla_put_failure;
3216         }
3217
3218         nlmsg_end(skb, nlh);
3219         return 0;
3220
3221 nla_put_failure:
3222         nlmsg_trim(skb, nlh);
3223         return -1;
3224 }
3225
3226 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3227                                   const struct nft_rule *rule, int event)
3228 {
3229         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3230         const struct nft_rule *prule;
3231         struct sk_buff *skb;
3232         u64 handle = 0;
3233         u16 flags = 0;
3234         int err;
3235
3236         if (!ctx->report &&
3237             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3238                 return;
3239
3240         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3241         if (skb == NULL)
3242                 goto err;
3243
3244         if (event == NFT_MSG_NEWRULE &&
3245             !list_is_first(&rule->list, &ctx->chain->rules) &&
3246             !list_is_last(&rule->list, &ctx->chain->rules)) {
3247                 prule = list_prev_entry(rule, list);
3248                 handle = prule->handle;
3249         }
3250         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3251                 flags |= NLM_F_APPEND;
3252         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3253                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3254
3255         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3256                                        event, flags, ctx->family, ctx->table,
3257                                        ctx->chain, rule, handle, false);
3258         if (err < 0) {
3259                 kfree_skb(skb);
3260                 goto err;
3261         }
3262
3263         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3264         return;
3265 err:
3266         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3267 }
3268
3269 struct nft_rule_dump_ctx {
3270         char *table;
3271         char *chain;
3272 };
3273
3274 static int __nf_tables_dump_rules(struct sk_buff *skb,
3275                                   unsigned int *idx,
3276                                   struct netlink_callback *cb,
3277                                   const struct nft_table *table,
3278                                   const struct nft_chain *chain,
3279                                   bool reset)
3280 {
3281         struct net *net = sock_net(skb->sk);
3282         const struct nft_rule *rule, *prule;
3283         unsigned int s_idx = cb->args[0];
3284         u64 handle;
3285
3286         prule = NULL;
3287         list_for_each_entry_rcu(rule, &chain->rules, list) {
3288                 if (!nft_is_active(net, rule))
3289                         goto cont_skip;
3290                 if (*idx < s_idx)
3291                         goto cont;
3292                 if (*idx > s_idx) {
3293                         memset(&cb->args[1], 0,
3294                                         sizeof(cb->args) - sizeof(cb->args[0]));
3295                 }
3296                 if (prule)
3297                         handle = prule->handle;
3298                 else
3299                         handle = 0;
3300
3301                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3302                                         cb->nlh->nlmsg_seq,
3303                                         NFT_MSG_NEWRULE,
3304                                         NLM_F_MULTI | NLM_F_APPEND,
3305                                         table->family,
3306                                         table, chain, rule, handle, reset) < 0)
3307                         return 1;
3308
3309                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3310 cont:
3311                 prule = rule;
3312 cont_skip:
3313                 (*idx)++;
3314         }
3315         return 0;
3316 }
3317
3318 static int nf_tables_dump_rules(struct sk_buff *skb,
3319                                 struct netlink_callback *cb)
3320 {
3321         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3322         const struct nft_rule_dump_ctx *ctx = cb->data;
3323         struct nft_table *table;
3324         const struct nft_chain *chain;
3325         unsigned int idx = 0;
3326         struct net *net = sock_net(skb->sk);
3327         int family = nfmsg->nfgen_family;
3328         struct nftables_pernet *nft_net;
3329         bool reset = false;
3330
3331         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3332                 reset = true;
3333
3334         rcu_read_lock();
3335         nft_net = nft_pernet(net);
3336         cb->seq = READ_ONCE(nft_net->base_seq);
3337
3338         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3339                 if (family != NFPROTO_UNSPEC && family != table->family)
3340                         continue;
3341
3342                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3343                         continue;
3344
3345                 if (ctx && ctx->table && ctx->chain) {
3346                         struct rhlist_head *list, *tmp;
3347
3348                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3349                                                nft_chain_ht_params);
3350                         if (!list)
3351                                 goto done;
3352
3353                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3354                                 if (!nft_is_active(net, chain))
3355                                         continue;
3356                                 __nf_tables_dump_rules(skb, &idx,
3357                                                        cb, table, chain, reset);
3358                                 break;
3359                         }
3360                         goto done;
3361                 }
3362
3363                 list_for_each_entry_rcu(chain, &table->chains, list) {
3364                         if (__nf_tables_dump_rules(skb, &idx,
3365                                                    cb, table, chain, reset))
3366                                 goto done;
3367                 }
3368
3369                 if (ctx && ctx->table)
3370                         break;
3371         }
3372 done:
3373         rcu_read_unlock();
3374
3375         cb->args[0] = idx;
3376         return skb->len;
3377 }
3378
3379 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3380 {
3381         const struct nlattr * const *nla = cb->data;
3382         struct nft_rule_dump_ctx *ctx = NULL;
3383
3384         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3385                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3386                 if (!ctx)
3387                         return -ENOMEM;
3388
3389                 if (nla[NFTA_RULE_TABLE]) {
3390                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3391                                                         GFP_ATOMIC);
3392                         if (!ctx->table) {
3393                                 kfree(ctx);
3394                                 return -ENOMEM;
3395                         }
3396                 }
3397                 if (nla[NFTA_RULE_CHAIN]) {
3398                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3399                                                 GFP_ATOMIC);
3400                         if (!ctx->chain) {
3401                                 kfree(ctx->table);
3402                                 kfree(ctx);
3403                                 return -ENOMEM;
3404                         }
3405                 }
3406         }
3407
3408         cb->data = ctx;
3409         return 0;
3410 }
3411
3412 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3413 {
3414         struct nft_rule_dump_ctx *ctx = cb->data;
3415
3416         if (ctx) {
3417                 kfree(ctx->table);
3418                 kfree(ctx->chain);
3419                 kfree(ctx);
3420         }
3421         return 0;
3422 }
3423
3424 /* called with rcu_read_lock held */
3425 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3426                              const struct nlattr * const nla[])
3427 {
3428         struct netlink_ext_ack *extack = info->extack;
3429         u8 genmask = nft_genmask_cur(info->net);
3430         u8 family = info->nfmsg->nfgen_family;
3431         const struct nft_chain *chain;
3432         const struct nft_rule *rule;
3433         struct net *net = info->net;
3434         struct nft_table *table;
3435         struct sk_buff *skb2;
3436         bool reset = false;
3437         int err;
3438
3439         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3440                 struct netlink_dump_control c = {
3441                         .start= nf_tables_dump_rules_start,
3442                         .dump = nf_tables_dump_rules,
3443                         .done = nf_tables_dump_rules_done,
3444                         .module = THIS_MODULE,
3445                         .data = (void *)nla,
3446                 };
3447
3448                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3449         }
3450
3451         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3452         if (IS_ERR(table)) {
3453                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3454                 return PTR_ERR(table);
3455         }
3456
3457         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3458         if (IS_ERR(chain)) {
3459                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3460                 return PTR_ERR(chain);
3461         }
3462
3463         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3464         if (IS_ERR(rule)) {
3465                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3466                 return PTR_ERR(rule);
3467         }
3468
3469         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3470         if (!skb2)
3471                 return -ENOMEM;
3472
3473         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3474                 reset = true;
3475
3476         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3477                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3478                                        family, table, chain, rule, 0, reset);
3479         if (err < 0)
3480                 goto err_fill_rule_info;
3481
3482         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3483
3484 err_fill_rule_info:
3485         kfree_skb(skb2);
3486         return err;
3487 }
3488
3489 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3490                                    struct nft_rule *rule)
3491 {
3492         struct nft_expr *expr, *next;
3493
3494         /*
3495          * Careful: some expressions might not be initialized in case this
3496          * is called on error from nf_tables_newrule().
3497          */
3498         expr = nft_expr_first(rule);
3499         while (nft_expr_more(rule, expr)) {
3500                 next = nft_expr_next(expr);
3501                 nf_tables_expr_destroy(ctx, expr);
3502                 expr = next;
3503         }
3504         kfree(rule);
3505 }
3506
3507 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3508 {
3509         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3510         nf_tables_rule_destroy(ctx, rule);
3511 }
3512
3513 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3514 {
3515         struct nft_expr *expr, *last;
3516         const struct nft_data *data;
3517         struct nft_rule *rule;
3518         int err;
3519
3520         if (ctx->level == NFT_JUMP_STACK_SIZE)
3521                 return -EMLINK;
3522
3523         list_for_each_entry(rule, &chain->rules, list) {
3524                 if (!nft_is_active_next(ctx->net, rule))
3525                         continue;
3526
3527                 nft_rule_for_each_expr(expr, last, rule) {
3528                         if (!expr->ops->validate)
3529                                 continue;
3530
3531                         err = expr->ops->validate(ctx, expr, &data);
3532                         if (err < 0)
3533                                 return err;
3534                 }
3535
3536                 cond_resched();
3537         }
3538
3539         return 0;
3540 }
3541 EXPORT_SYMBOL_GPL(nft_chain_validate);
3542
3543 static int nft_table_validate(struct net *net, const struct nft_table *table)
3544 {
3545         struct nft_chain *chain;
3546         struct nft_ctx ctx = {
3547                 .net    = net,
3548                 .family = table->family,
3549         };
3550         int err;
3551
3552         list_for_each_entry(chain, &table->chains, list) {
3553                 if (!nft_is_base_chain(chain))
3554                         continue;
3555
3556                 ctx.chain = chain;
3557                 err = nft_chain_validate(&ctx, chain);
3558                 if (err < 0)
3559                         return err;
3560         }
3561
3562         return 0;
3563 }
3564
3565 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3566                          const struct nft_set_iter *iter,
3567                          struct nft_set_elem *elem)
3568 {
3569         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3570         struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3571         const struct nft_data *data;
3572         int err;
3573
3574         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3575             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3576                 return 0;
3577
3578         data = nft_set_ext_data(ext);
3579         switch (data->verdict.code) {
3580         case NFT_JUMP:
3581         case NFT_GOTO:
3582                 pctx->level++;
3583                 err = nft_chain_validate(ctx, data->verdict.chain);
3584                 if (err < 0)
3585                         return err;
3586                 pctx->level--;
3587                 break;
3588         default:
3589                 break;
3590         }
3591
3592         return 0;
3593 }
3594
3595 struct nft_set_elem_catchall {
3596         struct list_head        list;
3597         struct rcu_head         rcu;
3598         void                    *elem;
3599 };
3600
3601 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3602 {
3603         u8 genmask = nft_genmask_next(ctx->net);
3604         struct nft_set_elem_catchall *catchall;
3605         struct nft_set_elem elem;
3606         struct nft_set_ext *ext;
3607         int ret = 0;
3608
3609         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3610                 ext = nft_set_elem_ext(set, catchall->elem);
3611                 if (!nft_set_elem_active(ext, genmask))
3612                         continue;
3613
3614                 elem.priv = catchall->elem;
3615                 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3616                 if (ret < 0)
3617                         return ret;
3618         }
3619
3620         return ret;
3621 }
3622
3623 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3624                                              const struct nft_chain *chain,
3625                                              const struct nlattr *nla);
3626
3627 #define NFT_RULE_MAXEXPRS       128
3628
3629 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3630                              const struct nlattr * const nla[])
3631 {
3632         struct nftables_pernet *nft_net = nft_pernet(info->net);
3633         struct netlink_ext_ack *extack = info->extack;
3634         unsigned int size, i, n, ulen = 0, usize = 0;
3635         u8 genmask = nft_genmask_next(info->net);
3636         struct nft_rule *rule, *old_rule = NULL;
3637         struct nft_expr_info *expr_info = NULL;
3638         u8 family = info->nfmsg->nfgen_family;
3639         struct nft_flow_rule *flow = NULL;
3640         struct net *net = info->net;
3641         struct nft_userdata *udata;
3642         struct nft_table *table;
3643         struct nft_chain *chain;
3644         struct nft_trans *trans;
3645         u64 handle, pos_handle;
3646         struct nft_expr *expr;
3647         struct nft_ctx ctx;
3648         struct nlattr *tmp;
3649         int err, rem;
3650
3651         lockdep_assert_held(&nft_net->commit_mutex);
3652
3653         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3654                                  NETLINK_CB(skb).portid);
3655         if (IS_ERR(table)) {
3656                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3657                 return PTR_ERR(table);
3658         }
3659
3660         if (nla[NFTA_RULE_CHAIN]) {
3661                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3662                                          genmask);
3663                 if (IS_ERR(chain)) {
3664                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3665                         return PTR_ERR(chain);
3666                 }
3667                 if (nft_chain_is_bound(chain))
3668                         return -EOPNOTSUPP;
3669
3670         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3671                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
3672                 if (IS_ERR(chain)) {
3673                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3674                         return PTR_ERR(chain);
3675                 }
3676         } else {
3677                 return -EINVAL;
3678         }
3679
3680         if (nla[NFTA_RULE_HANDLE]) {
3681                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3682                 rule = __nft_rule_lookup(chain, handle);
3683                 if (IS_ERR(rule)) {
3684                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3685                         return PTR_ERR(rule);
3686                 }
3687
3688                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3689                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3690                         return -EEXIST;
3691                 }
3692                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3693                         old_rule = rule;
3694                 else
3695                         return -EOPNOTSUPP;
3696         } else {
3697                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3698                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3699                         return -EINVAL;
3700                 handle = nf_tables_alloc_handle(table);
3701
3702                 if (chain->use == UINT_MAX)
3703                         return -EOVERFLOW;
3704
3705                 if (nla[NFTA_RULE_POSITION]) {
3706                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3707                         old_rule = __nft_rule_lookup(chain, pos_handle);
3708                         if (IS_ERR(old_rule)) {
3709                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3710                                 return PTR_ERR(old_rule);
3711                         }
3712                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3713                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3714                         if (IS_ERR(old_rule)) {
3715                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3716                                 return PTR_ERR(old_rule);
3717                         }
3718                 }
3719         }
3720
3721         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3722
3723         n = 0;
3724         size = 0;
3725         if (nla[NFTA_RULE_EXPRESSIONS]) {
3726                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3727                                            sizeof(struct nft_expr_info),
3728                                            GFP_KERNEL);
3729                 if (!expr_info)
3730                         return -ENOMEM;
3731
3732                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3733                         err = -EINVAL;
3734                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3735                                 goto err_release_expr;
3736                         if (n == NFT_RULE_MAXEXPRS)
3737                                 goto err_release_expr;
3738                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3739                         if (err < 0) {
3740                                 NL_SET_BAD_ATTR(extack, tmp);
3741                                 goto err_release_expr;
3742                         }
3743                         size += expr_info[n].ops->size;
3744                         n++;
3745                 }
3746         }
3747         /* Check for overflow of dlen field */
3748         err = -EFBIG;
3749         if (size >= 1 << 12)
3750                 goto err_release_expr;
3751
3752         if (nla[NFTA_RULE_USERDATA]) {
3753                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3754                 if (ulen > 0)
3755                         usize = sizeof(struct nft_userdata) + ulen;
3756         }
3757
3758         err = -ENOMEM;
3759         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3760         if (rule == NULL)
3761                 goto err_release_expr;
3762
3763         nft_activate_next(net, rule);
3764
3765         rule->handle = handle;
3766         rule->dlen   = size;
3767         rule->udata  = ulen ? 1 : 0;
3768
3769         if (ulen) {
3770                 udata = nft_userdata(rule);
3771                 udata->len = ulen - 1;
3772                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3773         }
3774
3775         expr = nft_expr_first(rule);
3776         for (i = 0; i < n; i++) {
3777                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3778                 if (err < 0) {
3779                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3780                         goto err_release_rule;
3781                 }
3782
3783                 if (expr_info[i].ops->validate)
3784                         nft_validate_state_update(table, NFT_VALIDATE_NEED);
3785
3786                 expr_info[i].ops = NULL;
3787                 expr = nft_expr_next(expr);
3788         }
3789
3790         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3791                 flow = nft_flow_rule_create(net, rule);
3792                 if (IS_ERR(flow)) {
3793                         err = PTR_ERR(flow);
3794                         goto err_release_rule;
3795                 }
3796         }
3797
3798         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3799                 err = nft_delrule(&ctx, old_rule);
3800                 if (err < 0)
3801                         goto err_destroy_flow_rule;
3802
3803                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3804                 if (trans == NULL) {
3805                         err = -ENOMEM;
3806                         goto err_destroy_flow_rule;
3807                 }
3808                 list_add_tail_rcu(&rule->list, &old_rule->list);
3809         } else {
3810                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3811                 if (!trans) {
3812                         err = -ENOMEM;
3813                         goto err_destroy_flow_rule;
3814                 }
3815
3816                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3817                         if (old_rule)
3818                                 list_add_rcu(&rule->list, &old_rule->list);
3819                         else
3820                                 list_add_tail_rcu(&rule->list, &chain->rules);
3821                  } else {
3822                         if (old_rule)
3823                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3824                         else
3825                                 list_add_rcu(&rule->list, &chain->rules);
3826                 }
3827         }
3828         kvfree(expr_info);
3829         chain->use++;
3830
3831         if (flow)
3832                 nft_trans_flow_rule(trans) = flow;
3833
3834         if (table->validate_state == NFT_VALIDATE_DO)
3835                 return nft_table_validate(net, table);
3836
3837         return 0;
3838
3839 err_destroy_flow_rule:
3840         if (flow)
3841                 nft_flow_rule_destroy(flow);
3842 err_release_rule:
3843         nf_tables_rule_release(&ctx, rule);
3844 err_release_expr:
3845         for (i = 0; i < n; i++) {
3846                 if (expr_info[i].ops) {
3847                         module_put(expr_info[i].ops->type->owner);
3848                         if (expr_info[i].ops->type->release_ops)
3849                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3850                 }
3851         }
3852         kvfree(expr_info);
3853
3854         return err;
3855 }
3856
3857 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3858                                              const struct nft_chain *chain,
3859                                              const struct nlattr *nla)
3860 {
3861         struct nftables_pernet *nft_net = nft_pernet(net);
3862         u32 id = ntohl(nla_get_be32(nla));
3863         struct nft_trans *trans;
3864
3865         list_for_each_entry(trans, &nft_net->commit_list, list) {
3866                 struct nft_rule *rule = nft_trans_rule(trans);
3867
3868                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3869                     trans->ctx.chain == chain &&
3870                     id == nft_trans_rule_id(trans))
3871                         return rule;
3872         }
3873         return ERR_PTR(-ENOENT);
3874 }
3875
3876 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3877                              const struct nlattr * const nla[])
3878 {
3879         struct netlink_ext_ack *extack = info->extack;
3880         u8 genmask = nft_genmask_next(info->net);
3881         u8 family = info->nfmsg->nfgen_family;
3882         struct nft_chain *chain = NULL;
3883         struct net *net = info->net;
3884         struct nft_table *table;
3885         struct nft_rule *rule;
3886         struct nft_ctx ctx;
3887         int err = 0;
3888
3889         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3890                                  NETLINK_CB(skb).portid);
3891         if (IS_ERR(table)) {
3892                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3893                 return PTR_ERR(table);
3894         }
3895
3896         if (nla[NFTA_RULE_CHAIN]) {
3897                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3898                                          genmask);
3899                 if (IS_ERR(chain)) {
3900                         if (PTR_ERR(chain) == -ENOENT &&
3901                             NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
3902                                 return 0;
3903
3904                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3905                         return PTR_ERR(chain);
3906                 }
3907                 if (nft_chain_is_bound(chain))
3908                         return -EOPNOTSUPP;
3909         }
3910
3911         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3912
3913         if (chain) {
3914                 if (nla[NFTA_RULE_HANDLE]) {
3915                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3916                         if (IS_ERR(rule)) {
3917                                 if (PTR_ERR(rule) == -ENOENT &&
3918                                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
3919                                         return 0;
3920
3921                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3922                                 return PTR_ERR(rule);
3923                         }
3924
3925                         err = nft_delrule(&ctx, rule);
3926                 } else if (nla[NFTA_RULE_ID]) {
3927                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
3928                         if (IS_ERR(rule)) {
3929                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3930                                 return PTR_ERR(rule);
3931                         }
3932
3933                         err = nft_delrule(&ctx, rule);
3934                 } else {
3935                         err = nft_delrule_by_chain(&ctx);
3936                 }
3937         } else {
3938                 list_for_each_entry(chain, &table->chains, list) {
3939                         if (!nft_is_active_next(net, chain))
3940                                 continue;
3941
3942                         ctx.chain = chain;
3943                         err = nft_delrule_by_chain(&ctx);
3944                         if (err < 0)
3945                                 break;
3946                 }
3947         }
3948
3949         return err;
3950 }
3951
3952 /*
3953  * Sets
3954  */
3955 static const struct nft_set_type *nft_set_types[] = {
3956         &nft_set_hash_fast_type,
3957         &nft_set_hash_type,
3958         &nft_set_rhash_type,
3959         &nft_set_bitmap_type,
3960         &nft_set_rbtree_type,
3961 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3962         &nft_set_pipapo_avx2_type,
3963 #endif
3964         &nft_set_pipapo_type,
3965 };
3966
3967 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3968                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3969                                  NFT_SET_EVAL)
3970
3971 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3972 {
3973         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3974 }
3975
3976 /*
3977  * Select a set implementation based on the data characteristics and the
3978  * given policy. The total memory use might not be known if no size is
3979  * given, in that case the amount of memory per element is used.
3980  */
3981 static const struct nft_set_ops *
3982 nft_select_set_ops(const struct nft_ctx *ctx,
3983                    const struct nlattr * const nla[],
3984                    const struct nft_set_desc *desc)
3985 {
3986         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3987         const struct nft_set_ops *ops, *bops;
3988         struct nft_set_estimate est, best;
3989         const struct nft_set_type *type;
3990         u32 flags = 0;
3991         int i;
3992
3993         lockdep_assert_held(&nft_net->commit_mutex);
3994         lockdep_nfnl_nft_mutex_not_held();
3995
3996         if (nla[NFTA_SET_FLAGS] != NULL)
3997                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3998
3999         bops        = NULL;
4000         best.size   = ~0;
4001         best.lookup = ~0;
4002         best.space  = ~0;
4003
4004         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4005                 type = nft_set_types[i];
4006                 ops = &type->ops;
4007
4008                 if (!nft_set_ops_candidate(type, flags))
4009                         continue;
4010                 if (!ops->estimate(desc, flags, &est))
4011                         continue;
4012
4013                 switch (desc->policy) {
4014                 case NFT_SET_POL_PERFORMANCE:
4015                         if (est.lookup < best.lookup)
4016                                 break;
4017                         if (est.lookup == best.lookup &&
4018                             est.space < best.space)
4019                                 break;
4020                         continue;
4021                 case NFT_SET_POL_MEMORY:
4022                         if (!desc->size) {
4023                                 if (est.space < best.space)
4024                                         break;
4025                                 if (est.space == best.space &&
4026                                     est.lookup < best.lookup)
4027                                         break;
4028                         } else if (est.size < best.size || !bops) {
4029                                 break;
4030                         }
4031                         continue;
4032                 default:
4033                         break;
4034                 }
4035
4036                 bops = ops;
4037                 best = est;
4038         }
4039
4040         if (bops != NULL)
4041                 return bops;
4042
4043         return ERR_PTR(-EOPNOTSUPP);
4044 }
4045
4046 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4047         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
4048                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4049         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
4050                                             .len = NFT_SET_MAXNAMELEN - 1 },
4051         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
4052         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
4053         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
4054         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
4055         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
4056         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
4057         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
4058         [NFTA_SET_ID]                   = { .type = NLA_U32 },
4059         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
4060         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
4061         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
4062                                             .len  = NFT_USERDATA_MAXLEN },
4063         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
4064         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
4065         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
4066         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
4067 };
4068
4069 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4070         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
4071         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
4072 };
4073
4074 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4075                                       const struct nlattr *nla, u8 genmask)
4076 {
4077         struct nft_set *set;
4078
4079         if (nla == NULL)
4080                 return ERR_PTR(-EINVAL);
4081
4082         list_for_each_entry_rcu(set, &table->sets, list) {
4083                 if (!nla_strcmp(nla, set->name) &&
4084                     nft_active_genmask(set, genmask))
4085                         return set;
4086         }
4087         return ERR_PTR(-ENOENT);
4088 }
4089
4090 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4091                                                const struct nlattr *nla,
4092                                                u8 genmask)
4093 {
4094         struct nft_set *set;
4095
4096         list_for_each_entry(set, &table->sets, list) {
4097                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4098                     nft_active_genmask(set, genmask))
4099                         return set;
4100         }
4101         return ERR_PTR(-ENOENT);
4102 }
4103
4104 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4105                                            const struct nft_table *table,
4106                                            const struct nlattr *nla, u8 genmask)
4107 {
4108         struct nftables_pernet *nft_net = nft_pernet(net);
4109         u32 id = ntohl(nla_get_be32(nla));
4110         struct nft_trans *trans;
4111
4112         list_for_each_entry(trans, &nft_net->commit_list, list) {
4113                 if (trans->msg_type == NFT_MSG_NEWSET) {
4114                         struct nft_set *set = nft_trans_set(trans);
4115
4116                         if (id == nft_trans_set_id(trans) &&
4117                             set->table == table &&
4118                             nft_active_genmask(set, genmask))
4119                                 return set;
4120                 }
4121         }
4122         return ERR_PTR(-ENOENT);
4123 }
4124
4125 struct nft_set *nft_set_lookup_global(const struct net *net,
4126                                       const struct nft_table *table,
4127                                       const struct nlattr *nla_set_name,
4128                                       const struct nlattr *nla_set_id,
4129                                       u8 genmask)
4130 {
4131         struct nft_set *set;
4132
4133         set = nft_set_lookup(table, nla_set_name, genmask);
4134         if (IS_ERR(set)) {
4135                 if (!nla_set_id)
4136                         return set;
4137
4138                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4139         }
4140         return set;
4141 }
4142 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4143
4144 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4145                                     const char *name)
4146 {
4147         const struct nft_set *i;
4148         const char *p;
4149         unsigned long *inuse;
4150         unsigned int n = 0, min = 0;
4151
4152         p = strchr(name, '%');
4153         if (p != NULL) {
4154                 if (p[1] != 'd' || strchr(p + 2, '%'))
4155                         return -EINVAL;
4156
4157                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4158                 if (inuse == NULL)
4159                         return -ENOMEM;
4160 cont:
4161                 list_for_each_entry(i, &ctx->table->sets, list) {
4162                         int tmp;
4163
4164                         if (!nft_is_active_next(ctx->net, i))
4165                                 continue;
4166                         if (!sscanf(i->name, name, &tmp))
4167                                 continue;
4168                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4169                                 continue;
4170
4171                         set_bit(tmp - min, inuse);
4172                 }
4173
4174                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4175                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4176                         min += BITS_PER_BYTE * PAGE_SIZE;
4177                         memset(inuse, 0, PAGE_SIZE);
4178                         goto cont;
4179                 }
4180                 free_page((unsigned long)inuse);
4181         }
4182
4183         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4184         if (!set->name)
4185                 return -ENOMEM;
4186
4187         list_for_each_entry(i, &ctx->table->sets, list) {
4188                 if (!nft_is_active_next(ctx->net, i))
4189                         continue;
4190                 if (!strcmp(set->name, i->name)) {
4191                         kfree(set->name);
4192                         set->name = NULL;
4193                         return -ENFILE;
4194                 }
4195         }
4196         return 0;
4197 }
4198
4199 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4200 {
4201         u64 ms = be64_to_cpu(nla_get_be64(nla));
4202         u64 max = (u64)(~((u64)0));
4203
4204         max = div_u64(max, NSEC_PER_MSEC);
4205         if (ms >= max)
4206                 return -ERANGE;
4207
4208         ms *= NSEC_PER_MSEC;
4209         *result = nsecs_to_jiffies64(ms);
4210         return 0;
4211 }
4212
4213 __be64 nf_jiffies64_to_msecs(u64 input)
4214 {
4215         return cpu_to_be64(jiffies64_to_msecs(input));
4216 }
4217
4218 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4219                                      const struct nft_set *set)
4220 {
4221         struct nlattr *concat, *field;
4222         int i;
4223
4224         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4225         if (!concat)
4226                 return -ENOMEM;
4227
4228         for (i = 0; i < set->field_count; i++) {
4229                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4230                 if (!field)
4231                         return -ENOMEM;
4232
4233                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4234                                  htonl(set->field_len[i])))
4235                         return -ENOMEM;
4236
4237                 nla_nest_end(skb, field);
4238         }
4239
4240         nla_nest_end(skb, concat);
4241
4242         return 0;
4243 }
4244
4245 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4246                               const struct nft_set *set, u16 event, u16 flags)
4247 {
4248         u64 timeout = READ_ONCE(set->timeout);
4249         u32 gc_int = READ_ONCE(set->gc_int);
4250         u32 portid = ctx->portid;
4251         struct nlmsghdr *nlh;
4252         struct nlattr *nest;
4253         u32 seq = ctx->seq;
4254         int i;
4255
4256         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4257         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4258                            NFNETLINK_V0, nft_base_seq(ctx->net));
4259         if (!nlh)
4260                 goto nla_put_failure;
4261
4262         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4263                 goto nla_put_failure;
4264         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4265                 goto nla_put_failure;
4266         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4267                          NFTA_SET_PAD))
4268                 goto nla_put_failure;
4269
4270         if (event == NFT_MSG_DELSET) {
4271                 nlmsg_end(skb, nlh);
4272                 return 0;
4273         }
4274
4275         if (set->flags != 0)
4276                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4277                         goto nla_put_failure;
4278
4279         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4280                 goto nla_put_failure;
4281         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4282                 goto nla_put_failure;
4283         if (set->flags & NFT_SET_MAP) {
4284                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4285                         goto nla_put_failure;
4286                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4287                         goto nla_put_failure;
4288         }
4289         if (set->flags & NFT_SET_OBJECT &&
4290             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4291                 goto nla_put_failure;
4292
4293         if (timeout &&
4294             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4295                          nf_jiffies64_to_msecs(timeout),
4296                          NFTA_SET_PAD))
4297                 goto nla_put_failure;
4298         if (gc_int &&
4299             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4300                 goto nla_put_failure;
4301
4302         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4303                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4304                         goto nla_put_failure;
4305         }
4306
4307         if (set->udata &&
4308             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4309                 goto nla_put_failure;
4310
4311         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4312         if (!nest)
4313                 goto nla_put_failure;
4314         if (set->size &&
4315             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4316                 goto nla_put_failure;
4317
4318         if (set->field_count > 1 &&
4319             nf_tables_fill_set_concat(skb, set))
4320                 goto nla_put_failure;
4321
4322         nla_nest_end(skb, nest);
4323
4324         if (set->num_exprs == 1) {
4325                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4326                 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4327                         goto nla_put_failure;
4328
4329                 nla_nest_end(skb, nest);
4330         } else if (set->num_exprs > 1) {
4331                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4332                 if (nest == NULL)
4333                         goto nla_put_failure;
4334
4335                 for (i = 0; i < set->num_exprs; i++) {
4336                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4337                                           set->exprs[i], false) < 0)
4338                                 goto nla_put_failure;
4339                 }
4340                 nla_nest_end(skb, nest);
4341         }
4342
4343         nlmsg_end(skb, nlh);
4344         return 0;
4345
4346 nla_put_failure:
4347         nlmsg_trim(skb, nlh);
4348         return -1;
4349 }
4350
4351 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4352                                  const struct nft_set *set, int event,
4353                                  gfp_t gfp_flags)
4354 {
4355         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4356         u32 portid = ctx->portid;
4357         struct sk_buff *skb;
4358         u16 flags = 0;
4359         int err;
4360
4361         if (!ctx->report &&
4362             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4363                 return;
4364
4365         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4366         if (skb == NULL)
4367                 goto err;
4368
4369         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4370                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4371
4372         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4373         if (err < 0) {
4374                 kfree_skb(skb);
4375                 goto err;
4376         }
4377
4378         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4379         return;
4380 err:
4381         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4382 }
4383
4384 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4385 {
4386         const struct nft_set *set;
4387         unsigned int idx, s_idx = cb->args[0];
4388         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4389         struct net *net = sock_net(skb->sk);
4390         struct nft_ctx *ctx = cb->data, ctx_set;
4391         struct nftables_pernet *nft_net;
4392
4393         if (cb->args[1])
4394                 return skb->len;
4395
4396         rcu_read_lock();
4397         nft_net = nft_pernet(net);
4398         cb->seq = READ_ONCE(nft_net->base_seq);
4399
4400         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4401                 if (ctx->family != NFPROTO_UNSPEC &&
4402                     ctx->family != table->family)
4403                         continue;
4404
4405                 if (ctx->table && ctx->table != table)
4406                         continue;
4407
4408                 if (cur_table) {
4409                         if (cur_table != table)
4410                                 continue;
4411
4412                         cur_table = NULL;
4413                 }
4414                 idx = 0;
4415                 list_for_each_entry_rcu(set, &table->sets, list) {
4416                         if (idx < s_idx)
4417                                 goto cont;
4418                         if (!nft_is_active(net, set))
4419                                 goto cont;
4420
4421                         ctx_set = *ctx;
4422                         ctx_set.table = table;
4423                         ctx_set.family = table->family;
4424
4425                         if (nf_tables_fill_set(skb, &ctx_set, set,
4426                                                NFT_MSG_NEWSET,
4427                                                NLM_F_MULTI) < 0) {
4428                                 cb->args[0] = idx;
4429                                 cb->args[2] = (unsigned long) table;
4430                                 goto done;
4431                         }
4432                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4433 cont:
4434                         idx++;
4435                 }
4436                 if (s_idx)
4437                         s_idx = 0;
4438         }
4439         cb->args[1] = 1;
4440 done:
4441         rcu_read_unlock();
4442         return skb->len;
4443 }
4444
4445 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4446 {
4447         struct nft_ctx *ctx_dump = NULL;
4448
4449         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4450         if (ctx_dump == NULL)
4451                 return -ENOMEM;
4452
4453         cb->data = ctx_dump;
4454         return 0;
4455 }
4456
4457 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4458 {
4459         kfree(cb->data);
4460         return 0;
4461 }
4462
4463 /* called with rcu_read_lock held */
4464 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4465                             const struct nlattr * const nla[])
4466 {
4467         struct netlink_ext_ack *extack = info->extack;
4468         u8 genmask = nft_genmask_cur(info->net);
4469         u8 family = info->nfmsg->nfgen_family;
4470         struct nft_table *table = NULL;
4471         struct net *net = info->net;
4472         const struct nft_set *set;
4473         struct sk_buff *skb2;
4474         struct nft_ctx ctx;
4475         int err;
4476
4477         if (nla[NFTA_SET_TABLE]) {
4478                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4479                                          genmask, 0);
4480                 if (IS_ERR(table)) {
4481                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4482                         return PTR_ERR(table);
4483                 }
4484         }
4485
4486         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4487
4488         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4489                 struct netlink_dump_control c = {
4490                         .start = nf_tables_dump_sets_start,
4491                         .dump = nf_tables_dump_sets,
4492                         .done = nf_tables_dump_sets_done,
4493                         .data = &ctx,
4494                         .module = THIS_MODULE,
4495                 };
4496
4497                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4498         }
4499
4500         /* Only accept unspec with dump */
4501         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4502                 return -EAFNOSUPPORT;
4503         if (!nla[NFTA_SET_TABLE])
4504                 return -EINVAL;
4505
4506         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4507         if (IS_ERR(set))
4508                 return PTR_ERR(set);
4509
4510         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4511         if (skb2 == NULL)
4512                 return -ENOMEM;
4513
4514         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4515         if (err < 0)
4516                 goto err_fill_set_info;
4517
4518         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4519
4520 err_fill_set_info:
4521         kfree_skb(skb2);
4522         return err;
4523 }
4524
4525 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4526         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4527 };
4528
4529 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4530                                      struct nft_set_desc *desc)
4531 {
4532         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4533         u32 len;
4534         int err;
4535
4536         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4537                 return -E2BIG;
4538
4539         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4540                                           nft_concat_policy, NULL);
4541         if (err < 0)
4542                 return err;
4543
4544         if (!tb[NFTA_SET_FIELD_LEN])
4545                 return -EINVAL;
4546
4547         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4548         if (!len || len > U8_MAX)
4549                 return -EINVAL;
4550
4551         desc->field_len[desc->field_count++] = len;
4552
4553         return 0;
4554 }
4555
4556 static int nft_set_desc_concat(struct nft_set_desc *desc,
4557                                const struct nlattr *nla)
4558 {
4559         struct nlattr *attr;
4560         u32 num_regs = 0;
4561         int rem, err, i;
4562
4563         nla_for_each_nested(attr, nla, rem) {
4564                 if (nla_type(attr) != NFTA_LIST_ELEM)
4565                         return -EINVAL;
4566
4567                 err = nft_set_desc_concat_parse(attr, desc);
4568                 if (err < 0)
4569                         return err;
4570         }
4571
4572         for (i = 0; i < desc->field_count; i++)
4573                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4574
4575         if (num_regs > NFT_REG32_COUNT)
4576                 return -E2BIG;
4577
4578         return 0;
4579 }
4580
4581 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4582                                     const struct nlattr *nla)
4583 {
4584         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4585         int err;
4586
4587         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4588                                           nft_set_desc_policy, NULL);
4589         if (err < 0)
4590                 return err;
4591
4592         if (da[NFTA_SET_DESC_SIZE] != NULL)
4593                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4594         if (da[NFTA_SET_DESC_CONCAT])
4595                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4596
4597         return err;
4598 }
4599
4600 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4601                               const struct nlattr * const *nla,
4602                               struct nft_expr **exprs, int *num_exprs,
4603                               u32 flags)
4604 {
4605         struct nft_expr *expr;
4606         int err, i;
4607
4608         if (nla[NFTA_SET_EXPR]) {
4609                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4610                 if (IS_ERR(expr)) {
4611                         err = PTR_ERR(expr);
4612                         goto err_set_expr_alloc;
4613                 }
4614                 exprs[0] = expr;
4615                 (*num_exprs)++;
4616         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4617                 struct nlattr *tmp;
4618                 int left;
4619
4620                 if (!(flags & NFT_SET_EXPR)) {
4621                         err = -EINVAL;
4622                         goto err_set_expr_alloc;
4623                 }
4624                 i = 0;
4625                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4626                         if (i == NFT_SET_EXPR_MAX) {
4627                                 err = -E2BIG;
4628                                 goto err_set_expr_alloc;
4629                         }
4630                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4631                                 err = -EINVAL;
4632                                 goto err_set_expr_alloc;
4633                         }
4634                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4635                         if (IS_ERR(expr)) {
4636                                 err = PTR_ERR(expr);
4637                                 goto err_set_expr_alloc;
4638                         }
4639                         exprs[i++] = expr;
4640                         (*num_exprs)++;
4641                 }
4642         }
4643
4644         return 0;
4645
4646 err_set_expr_alloc:
4647         for (i = 0; i < *num_exprs; i++)
4648                 nft_expr_destroy(ctx, exprs[i]);
4649
4650         return err;
4651 }
4652
4653 static bool nft_set_is_same(const struct nft_set *set,
4654                             const struct nft_set_desc *desc,
4655                             struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4656 {
4657         int i;
4658
4659         if (set->ktype != desc->ktype ||
4660             set->dtype != desc->dtype ||
4661             set->flags != flags ||
4662             set->klen != desc->klen ||
4663             set->dlen != desc->dlen ||
4664             set->field_count != desc->field_count ||
4665             set->num_exprs != num_exprs)
4666                 return false;
4667
4668         for (i = 0; i < desc->field_count; i++) {
4669                 if (set->field_len[i] != desc->field_len[i])
4670                         return false;
4671         }
4672
4673         for (i = 0; i < num_exprs; i++) {
4674                 if (set->exprs[i]->ops != exprs[i]->ops)
4675                         return false;
4676         }
4677
4678         return true;
4679 }
4680
4681 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4682                             const struct nlattr * const nla[])
4683 {
4684         struct netlink_ext_ack *extack = info->extack;
4685         u8 genmask = nft_genmask_next(info->net);
4686         u8 family = info->nfmsg->nfgen_family;
4687         const struct nft_set_ops *ops;
4688         struct net *net = info->net;
4689         struct nft_set_desc desc;
4690         struct nft_table *table;
4691         unsigned char *udata;
4692         struct nft_set *set;
4693         struct nft_ctx ctx;
4694         size_t alloc_size;
4695         int num_exprs = 0;
4696         char *name;
4697         int err, i;
4698         u16 udlen;
4699         u32 flags;
4700         u64 size;
4701
4702         if (nla[NFTA_SET_TABLE] == NULL ||
4703             nla[NFTA_SET_NAME] == NULL ||
4704             nla[NFTA_SET_KEY_LEN] == NULL ||
4705             nla[NFTA_SET_ID] == NULL)
4706                 return -EINVAL;
4707
4708         memset(&desc, 0, sizeof(desc));
4709
4710         desc.ktype = NFT_DATA_VALUE;
4711         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4712                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4713                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4714                         return -EINVAL;
4715         }
4716
4717         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4718         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4719                 return -EINVAL;
4720
4721         flags = 0;
4722         if (nla[NFTA_SET_FLAGS] != NULL) {
4723                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4724                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4725                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4726                               NFT_SET_MAP | NFT_SET_EVAL |
4727                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4728                         return -EOPNOTSUPP;
4729                 /* Only one of these operations is supported */
4730                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4731                              (NFT_SET_MAP | NFT_SET_OBJECT))
4732                         return -EOPNOTSUPP;
4733                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4734                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4735                         return -EOPNOTSUPP;
4736         }
4737
4738         desc.dtype = 0;
4739         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4740                 if (!(flags & NFT_SET_MAP))
4741                         return -EINVAL;
4742
4743                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4744                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4745                     desc.dtype != NFT_DATA_VERDICT)
4746                         return -EINVAL;
4747
4748                 if (desc.dtype != NFT_DATA_VERDICT) {
4749                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4750                                 return -EINVAL;
4751                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4752                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4753                                 return -EINVAL;
4754                 } else
4755                         desc.dlen = sizeof(struct nft_verdict);
4756         } else if (flags & NFT_SET_MAP)
4757                 return -EINVAL;
4758
4759         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4760                 if (!(flags & NFT_SET_OBJECT))
4761                         return -EINVAL;
4762
4763                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4764                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4765                     desc.objtype > NFT_OBJECT_MAX)
4766                         return -EOPNOTSUPP;
4767         } else if (flags & NFT_SET_OBJECT)
4768                 return -EINVAL;
4769         else
4770                 desc.objtype = NFT_OBJECT_UNSPEC;
4771
4772         desc.timeout = 0;
4773         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4774                 if (!(flags & NFT_SET_TIMEOUT))
4775                         return -EINVAL;
4776
4777                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4778                 if (err)
4779                         return err;
4780         }
4781         desc.gc_int = 0;
4782         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4783                 if (!(flags & NFT_SET_TIMEOUT))
4784                         return -EINVAL;
4785                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4786         }
4787
4788         desc.policy = NFT_SET_POL_PERFORMANCE;
4789         if (nla[NFTA_SET_POLICY] != NULL)
4790                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4791
4792         if (nla[NFTA_SET_DESC] != NULL) {
4793                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4794                 if (err < 0)
4795                         return err;
4796
4797                 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4798                         return -EINVAL;
4799         } else if (flags & NFT_SET_CONCAT) {
4800                 return -EINVAL;
4801         }
4802
4803         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4804                 desc.expr = true;
4805
4806         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4807                                  NETLINK_CB(skb).portid);
4808         if (IS_ERR(table)) {
4809                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4810                 return PTR_ERR(table);
4811         }
4812
4813         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4814
4815         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4816         if (IS_ERR(set)) {
4817                 if (PTR_ERR(set) != -ENOENT) {
4818                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4819                         return PTR_ERR(set);
4820                 }
4821         } else {
4822                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
4823
4824                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4825                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4826                         return -EEXIST;
4827                 }
4828                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4829                         return -EOPNOTSUPP;
4830
4831                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
4832                 if (err < 0)
4833                         return err;
4834
4835                 err = 0;
4836                 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
4837                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4838                         err = -EEXIST;
4839                 }
4840
4841                 for (i = 0; i < num_exprs; i++)
4842                         nft_expr_destroy(&ctx, exprs[i]);
4843
4844                 if (err < 0)
4845                         return err;
4846
4847                 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
4848         }
4849
4850         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4851                 return -ENOENT;
4852
4853         ops = nft_select_set_ops(&ctx, nla, &desc);
4854         if (IS_ERR(ops))
4855                 return PTR_ERR(ops);
4856
4857         udlen = 0;
4858         if (nla[NFTA_SET_USERDATA])
4859                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4860
4861         size = 0;
4862         if (ops->privsize != NULL)
4863                 size = ops->privsize(nla, &desc);
4864         alloc_size = sizeof(*set) + size + udlen;
4865         if (alloc_size < size || alloc_size > INT_MAX)
4866                 return -ENOMEM;
4867         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
4868         if (!set)
4869                 return -ENOMEM;
4870
4871         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
4872         if (!name) {
4873                 err = -ENOMEM;
4874                 goto err_set_name;
4875         }
4876
4877         err = nf_tables_set_alloc_name(&ctx, set, name);
4878         kfree(name);
4879         if (err < 0)
4880                 goto err_set_name;
4881
4882         udata = NULL;
4883         if (udlen) {
4884                 udata = set->data + size;
4885                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4886         }
4887
4888         INIT_LIST_HEAD(&set->bindings);
4889         INIT_LIST_HEAD(&set->catchall_list);
4890         set->table = table;
4891         write_pnet(&set->net, net);
4892         set->ops = ops;
4893         set->ktype = desc.ktype;
4894         set->klen = desc.klen;
4895         set->dtype = desc.dtype;
4896         set->objtype = desc.objtype;
4897         set->dlen = desc.dlen;
4898         set->flags = flags;
4899         set->size = desc.size;
4900         set->policy = desc.policy;
4901         set->udlen = udlen;
4902         set->udata = udata;
4903         set->timeout = desc.timeout;
4904         set->gc_int = desc.gc_int;
4905
4906         set->field_count = desc.field_count;
4907         for (i = 0; i < desc.field_count; i++)
4908                 set->field_len[i] = desc.field_len[i];
4909
4910         err = ops->init(set, &desc, nla);
4911         if (err < 0)
4912                 goto err_set_init;
4913
4914         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
4915         if (err < 0)
4916                 goto err_set_destroy;
4917
4918         set->num_exprs = num_exprs;
4919         set->handle = nf_tables_alloc_handle(table);
4920
4921         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4922         if (err < 0)
4923                 goto err_set_expr_alloc;
4924
4925         list_add_tail_rcu(&set->list, &table->sets);
4926         table->use++;
4927         return 0;
4928
4929 err_set_expr_alloc:
4930         for (i = 0; i < set->num_exprs; i++)
4931                 nft_expr_destroy(&ctx, set->exprs[i]);
4932 err_set_destroy:
4933         ops->destroy(set);
4934 err_set_init:
4935         kfree(set->name);
4936 err_set_name:
4937         kvfree(set);
4938         return err;
4939 }
4940
4941 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4942                                      struct nft_set *set)
4943 {
4944         struct nft_set_elem_catchall *next, *catchall;
4945
4946         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4947                 list_del_rcu(&catchall->list);
4948                 nft_set_elem_destroy(set, catchall->elem, true);
4949                 kfree_rcu(catchall, rcu);
4950         }
4951 }
4952
4953 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4954 {
4955         int i;
4956
4957         if (WARN_ON(set->use > 0))
4958                 return;
4959
4960         for (i = 0; i < set->num_exprs; i++)
4961                 nft_expr_destroy(ctx, set->exprs[i]);
4962
4963         set->ops->destroy(set);
4964         nft_set_catchall_destroy(ctx, set);
4965         kfree(set->name);
4966         kvfree(set);
4967 }
4968
4969 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4970                             const struct nlattr * const nla[])
4971 {
4972         struct netlink_ext_ack *extack = info->extack;
4973         u8 genmask = nft_genmask_next(info->net);
4974         u8 family = info->nfmsg->nfgen_family;
4975         struct net *net = info->net;
4976         const struct nlattr *attr;
4977         struct nft_table *table;
4978         struct nft_set *set;
4979         struct nft_ctx ctx;
4980
4981         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4982                 return -EAFNOSUPPORT;
4983
4984         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4985                                  genmask, NETLINK_CB(skb).portid);
4986         if (IS_ERR(table)) {
4987                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4988                 return PTR_ERR(table);
4989         }
4990
4991         if (nla[NFTA_SET_HANDLE]) {
4992                 attr = nla[NFTA_SET_HANDLE];
4993                 set = nft_set_lookup_byhandle(table, attr, genmask);
4994         } else {
4995                 attr = nla[NFTA_SET_NAME];
4996                 set = nft_set_lookup(table, attr, genmask);
4997         }
4998
4999         if (IS_ERR(set)) {
5000                 if (PTR_ERR(set) == -ENOENT &&
5001                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5002                         return 0;
5003
5004                 NL_SET_BAD_ATTR(extack, attr);
5005                 return PTR_ERR(set);
5006         }
5007         if (set->use ||
5008             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5009              atomic_read(&set->nelems) > 0)) {
5010                 NL_SET_BAD_ATTR(extack, attr);
5011                 return -EBUSY;
5012         }
5013
5014         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5015
5016         return nft_delset(&ctx, set);
5017 }
5018
5019 static int nft_validate_register_store(const struct nft_ctx *ctx,
5020                                        enum nft_registers reg,
5021                                        const struct nft_data *data,
5022                                        enum nft_data_types type,
5023                                        unsigned int len);
5024
5025 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5026                                      struct nft_set *set,
5027                                      struct nft_set_elem *elem)
5028 {
5029         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5030         enum nft_registers dreg;
5031
5032         dreg = nft_type_to_reg(set->dtype);
5033         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5034                                            set->dtype == NFT_DATA_VERDICT ?
5035                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
5036                                            set->dlen);
5037 }
5038
5039 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5040                                         struct nft_set *set,
5041                                         const struct nft_set_iter *iter,
5042                                         struct nft_set_elem *elem)
5043 {
5044         return nft_setelem_data_validate(ctx, set, elem);
5045 }
5046
5047 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5048                                        struct nft_set *set)
5049 {
5050         u8 genmask = nft_genmask_next(ctx->net);
5051         struct nft_set_elem_catchall *catchall;
5052         struct nft_set_elem elem;
5053         struct nft_set_ext *ext;
5054         int ret = 0;
5055
5056         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5057                 ext = nft_set_elem_ext(set, catchall->elem);
5058                 if (!nft_set_elem_active(ext, genmask))
5059                         continue;
5060
5061                 elem.priv = catchall->elem;
5062                 ret = nft_setelem_data_validate(ctx, set, &elem);
5063                 if (ret < 0)
5064                         break;
5065         }
5066
5067         return ret;
5068 }
5069
5070 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5071                        struct nft_set_binding *binding)
5072 {
5073         struct nft_set_binding *i;
5074         struct nft_set_iter iter;
5075
5076         if (set->use == UINT_MAX)
5077                 return -EOVERFLOW;
5078
5079         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5080                 return -EBUSY;
5081
5082         if (binding->flags & NFT_SET_MAP) {
5083                 /* If the set is already bound to the same chain all
5084                  * jumps are already validated for that chain.
5085                  */
5086                 list_for_each_entry(i, &set->bindings, list) {
5087                         if (i->flags & NFT_SET_MAP &&
5088                             i->chain == binding->chain)
5089                                 goto bind;
5090                 }
5091
5092                 iter.genmask    = nft_genmask_next(ctx->net);
5093                 iter.skip       = 0;
5094                 iter.count      = 0;
5095                 iter.err        = 0;
5096                 iter.fn         = nf_tables_bind_check_setelem;
5097
5098                 set->ops->walk(ctx, set, &iter);
5099                 if (!iter.err)
5100                         iter.err = nft_set_catchall_bind_check(ctx, set);
5101
5102                 if (iter.err < 0)
5103                         return iter.err;
5104         }
5105 bind:
5106         binding->chain = ctx->chain;
5107         list_add_tail_rcu(&binding->list, &set->bindings);
5108         nft_set_trans_bind(ctx, set);
5109         set->use++;
5110
5111         return 0;
5112 }
5113 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5114
5115 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5116                                  struct nft_set_binding *binding, bool event)
5117 {
5118         list_del_rcu(&binding->list);
5119
5120         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5121                 list_del_rcu(&set->list);
5122                 if (event)
5123                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5124                                              GFP_KERNEL);
5125         }
5126 }
5127
5128 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5129                               struct nft_set_binding *binding,
5130                               enum nft_trans_phase phase)
5131 {
5132         switch (phase) {
5133         case NFT_TRANS_PREPARE:
5134                 set->use--;
5135                 return;
5136         case NFT_TRANS_ABORT:
5137         case NFT_TRANS_RELEASE:
5138                 set->use--;
5139                 fallthrough;
5140         default:
5141                 nf_tables_unbind_set(ctx, set, binding,
5142                                      phase == NFT_TRANS_COMMIT);
5143         }
5144 }
5145 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5146
5147 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5148 {
5149         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5150                 nft_set_destroy(ctx, set);
5151 }
5152 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5153
5154 const struct nft_set_ext_type nft_set_ext_types[] = {
5155         [NFT_SET_EXT_KEY]               = {
5156                 .align  = __alignof__(u32),
5157         },
5158         [NFT_SET_EXT_DATA]              = {
5159                 .align  = __alignof__(u32),
5160         },
5161         [NFT_SET_EXT_EXPRESSIONS]       = {
5162                 .align  = __alignof__(struct nft_set_elem_expr),
5163         },
5164         [NFT_SET_EXT_OBJREF]            = {
5165                 .len    = sizeof(struct nft_object *),
5166                 .align  = __alignof__(struct nft_object *),
5167         },
5168         [NFT_SET_EXT_FLAGS]             = {
5169                 .len    = sizeof(u8),
5170                 .align  = __alignof__(u8),
5171         },
5172         [NFT_SET_EXT_TIMEOUT]           = {
5173                 .len    = sizeof(u64),
5174                 .align  = __alignof__(u64),
5175         },
5176         [NFT_SET_EXT_EXPIRATION]        = {
5177                 .len    = sizeof(u64),
5178                 .align  = __alignof__(u64),
5179         },
5180         [NFT_SET_EXT_USERDATA]          = {
5181                 .len    = sizeof(struct nft_userdata),
5182                 .align  = __alignof__(struct nft_userdata),
5183         },
5184         [NFT_SET_EXT_KEY_END]           = {
5185                 .align  = __alignof__(u32),
5186         },
5187 };
5188
5189 /*
5190  * Set elements
5191  */
5192
5193 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5194         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
5195         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
5196         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
5197         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
5198         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
5199         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
5200                                             .len = NFT_USERDATA_MAXLEN },
5201         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
5202         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
5203                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
5204         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
5205         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
5206 };
5207
5208 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5209         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
5210                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
5211         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
5212                                             .len = NFT_SET_MAXNAMELEN - 1 },
5213         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
5214         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
5215 };
5216
5217 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5218                                   const struct nft_set *set,
5219                                   const struct nft_set_ext *ext)
5220 {
5221         struct nft_set_elem_expr *elem_expr;
5222         u32 size, num_exprs = 0;
5223         struct nft_expr *expr;
5224         struct nlattr *nest;
5225
5226         elem_expr = nft_set_ext_expr(ext);
5227         nft_setelem_expr_foreach(expr, elem_expr, size)
5228                 num_exprs++;
5229
5230         if (num_exprs == 1) {
5231                 expr = nft_setelem_expr_at(elem_expr, 0);
5232                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, false) < 0)
5233                         return -1;
5234
5235                 return 0;
5236         } else if (num_exprs > 1) {
5237                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5238                 if (nest == NULL)
5239                         goto nla_put_failure;
5240
5241                 nft_setelem_expr_foreach(expr, elem_expr, size) {
5242                         expr = nft_setelem_expr_at(elem_expr, size);
5243                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, false) < 0)
5244                                 goto nla_put_failure;
5245                 }
5246                 nla_nest_end(skb, nest);
5247         }
5248         return 0;
5249
5250 nla_put_failure:
5251         return -1;
5252 }
5253
5254 static int nf_tables_fill_setelem(struct sk_buff *skb,
5255                                   const struct nft_set *set,
5256                                   const struct nft_set_elem *elem)
5257 {
5258         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5259         unsigned char *b = skb_tail_pointer(skb);
5260         struct nlattr *nest;
5261
5262         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5263         if (nest == NULL)
5264                 goto nla_put_failure;
5265
5266         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5267             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5268                           NFT_DATA_VALUE, set->klen) < 0)
5269                 goto nla_put_failure;
5270
5271         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5272             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5273                           NFT_DATA_VALUE, set->klen) < 0)
5274                 goto nla_put_failure;
5275
5276         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5277             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5278                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5279                           set->dlen) < 0)
5280                 goto nla_put_failure;
5281
5282         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5283             nft_set_elem_expr_dump(skb, set, ext))
5284                 goto nla_put_failure;
5285
5286         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5287             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5288                            (*nft_set_ext_obj(ext))->key.name) < 0)
5289                 goto nla_put_failure;
5290
5291         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5292             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5293                          htonl(*nft_set_ext_flags(ext))))
5294                 goto nla_put_failure;
5295
5296         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5297             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5298                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5299                          NFTA_SET_ELEM_PAD))
5300                 goto nla_put_failure;
5301
5302         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5303                 u64 expires, now = get_jiffies_64();
5304
5305                 expires = *nft_set_ext_expiration(ext);
5306                 if (time_before64(now, expires))
5307                         expires -= now;
5308                 else
5309                         expires = 0;
5310
5311                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5312                                  nf_jiffies64_to_msecs(expires),
5313                                  NFTA_SET_ELEM_PAD))
5314                         goto nla_put_failure;
5315         }
5316
5317         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5318                 struct nft_userdata *udata;
5319
5320                 udata = nft_set_ext_userdata(ext);
5321                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5322                             udata->len + 1, udata->data))
5323                         goto nla_put_failure;
5324         }
5325
5326         nla_nest_end(skb, nest);
5327         return 0;
5328
5329 nla_put_failure:
5330         nlmsg_trim(skb, b);
5331         return -EMSGSIZE;
5332 }
5333
5334 struct nft_set_dump_args {
5335         const struct netlink_callback   *cb;
5336         struct nft_set_iter             iter;
5337         struct sk_buff                  *skb;
5338 };
5339
5340 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5341                                   struct nft_set *set,
5342                                   const struct nft_set_iter *iter,
5343                                   struct nft_set_elem *elem)
5344 {
5345         struct nft_set_dump_args *args;
5346
5347         args = container_of(iter, struct nft_set_dump_args, iter);
5348         return nf_tables_fill_setelem(args->skb, set, elem);
5349 }
5350
5351 struct nft_set_dump_ctx {
5352         const struct nft_set    *set;
5353         struct nft_ctx          ctx;
5354 };
5355
5356 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5357                                  const struct nft_set *set)
5358 {
5359         struct nft_set_elem_catchall *catchall;
5360         u8 genmask = nft_genmask_cur(net);
5361         struct nft_set_elem elem;
5362         struct nft_set_ext *ext;
5363         int ret = 0;
5364
5365         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5366                 ext = nft_set_elem_ext(set, catchall->elem);
5367                 if (!nft_set_elem_active(ext, genmask) ||
5368                     nft_set_elem_expired(ext))
5369                         continue;
5370
5371                 elem.priv = catchall->elem;
5372                 ret = nf_tables_fill_setelem(skb, set, &elem);
5373                 break;
5374         }
5375
5376         return ret;
5377 }
5378
5379 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5380 {
5381         struct nft_set_dump_ctx *dump_ctx = cb->data;
5382         struct net *net = sock_net(skb->sk);
5383         struct nftables_pernet *nft_net;
5384         struct nft_table *table;
5385         struct nft_set *set;
5386         struct nft_set_dump_args args;
5387         bool set_found = false;
5388         struct nlmsghdr *nlh;
5389         struct nlattr *nest;
5390         u32 portid, seq;
5391         int event;
5392
5393         rcu_read_lock();
5394         nft_net = nft_pernet(net);
5395         cb->seq = READ_ONCE(nft_net->base_seq);
5396
5397         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5398                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5399                     dump_ctx->ctx.family != table->family)
5400                         continue;
5401
5402                 if (table != dump_ctx->ctx.table)
5403                         continue;
5404
5405                 list_for_each_entry_rcu(set, &table->sets, list) {
5406                         if (set == dump_ctx->set) {
5407                                 set_found = true;
5408                                 break;
5409                         }
5410                 }
5411                 break;
5412         }
5413
5414         if (!set_found) {
5415                 rcu_read_unlock();
5416                 return -ENOENT;
5417         }
5418
5419         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5420         portid = NETLINK_CB(cb->skb).portid;
5421         seq    = cb->nlh->nlmsg_seq;
5422
5423         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5424                            table->family, NFNETLINK_V0, nft_base_seq(net));
5425         if (!nlh)
5426                 goto nla_put_failure;
5427
5428         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5429                 goto nla_put_failure;
5430         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5431                 goto nla_put_failure;
5432
5433         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5434         if (nest == NULL)
5435                 goto nla_put_failure;
5436
5437         args.cb                 = cb;
5438         args.skb                = skb;
5439         args.iter.genmask       = nft_genmask_cur(net);
5440         args.iter.skip          = cb->args[0];
5441         args.iter.count         = 0;
5442         args.iter.err           = 0;
5443         args.iter.fn            = nf_tables_dump_setelem;
5444         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5445
5446         if (!args.iter.err && args.iter.count == cb->args[0])
5447                 args.iter.err = nft_set_catchall_dump(net, skb, set);
5448         rcu_read_unlock();
5449
5450         nla_nest_end(skb, nest);
5451         nlmsg_end(skb, nlh);
5452
5453         if (args.iter.err && args.iter.err != -EMSGSIZE)
5454                 return args.iter.err;
5455         if (args.iter.count == cb->args[0])
5456                 return 0;
5457
5458         cb->args[0] = args.iter.count;
5459         return skb->len;
5460
5461 nla_put_failure:
5462         rcu_read_unlock();
5463         return -ENOSPC;
5464 }
5465
5466 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5467 {
5468         struct nft_set_dump_ctx *dump_ctx = cb->data;
5469
5470         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5471
5472         return cb->data ? 0 : -ENOMEM;
5473 }
5474
5475 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5476 {
5477         kfree(cb->data);
5478         return 0;
5479 }
5480
5481 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5482                                        const struct nft_ctx *ctx, u32 seq,
5483                                        u32 portid, int event, u16 flags,
5484                                        const struct nft_set *set,
5485                                        const struct nft_set_elem *elem)
5486 {
5487         struct nlmsghdr *nlh;
5488         struct nlattr *nest;
5489         int err;
5490
5491         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5492         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5493                            NFNETLINK_V0, nft_base_seq(ctx->net));
5494         if (!nlh)
5495                 goto nla_put_failure;
5496
5497         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5498                 goto nla_put_failure;
5499         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5500                 goto nla_put_failure;
5501
5502         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5503         if (nest == NULL)
5504                 goto nla_put_failure;
5505
5506         err = nf_tables_fill_setelem(skb, set, elem);
5507         if (err < 0)
5508                 goto nla_put_failure;
5509
5510         nla_nest_end(skb, nest);
5511
5512         nlmsg_end(skb, nlh);
5513         return 0;
5514
5515 nla_put_failure:
5516         nlmsg_trim(skb, nlh);
5517         return -1;
5518 }
5519
5520 static int nft_setelem_parse_flags(const struct nft_set *set,
5521                                    const struct nlattr *attr, u32 *flags)
5522 {
5523         if (attr == NULL)
5524                 return 0;
5525
5526         *flags = ntohl(nla_get_be32(attr));
5527         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5528                 return -EOPNOTSUPP;
5529         if (!(set->flags & NFT_SET_INTERVAL) &&
5530             *flags & NFT_SET_ELEM_INTERVAL_END)
5531                 return -EINVAL;
5532         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5533             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5534                 return -EINVAL;
5535
5536         return 0;
5537 }
5538
5539 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5540                                  struct nft_data *key, struct nlattr *attr)
5541 {
5542         struct nft_data_desc desc = {
5543                 .type   = NFT_DATA_VALUE,
5544                 .size   = NFT_DATA_VALUE_MAXLEN,
5545                 .len    = set->klen,
5546         };
5547
5548         return nft_data_init(ctx, key, &desc, attr);
5549 }
5550
5551 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5552                                   struct nft_data_desc *desc,
5553                                   struct nft_data *data,
5554                                   struct nlattr *attr)
5555 {
5556         u32 dtype;
5557
5558         if (set->dtype == NFT_DATA_VERDICT)
5559                 dtype = NFT_DATA_VERDICT;
5560         else
5561                 dtype = NFT_DATA_VALUE;
5562
5563         desc->type = dtype;
5564         desc->size = NFT_DATA_VALUE_MAXLEN;
5565         desc->len = set->dlen;
5566         desc->flags = NFT_DATA_DESC_SETELEM;
5567
5568         return nft_data_init(ctx, data, desc, attr);
5569 }
5570
5571 static void *nft_setelem_catchall_get(const struct net *net,
5572                                       const struct nft_set *set)
5573 {
5574         struct nft_set_elem_catchall *catchall;
5575         u8 genmask = nft_genmask_cur(net);
5576         struct nft_set_ext *ext;
5577         void *priv = NULL;
5578
5579         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5580                 ext = nft_set_elem_ext(set, catchall->elem);
5581                 if (!nft_set_elem_active(ext, genmask) ||
5582                     nft_set_elem_expired(ext))
5583                         continue;
5584
5585                 priv = catchall->elem;
5586                 break;
5587         }
5588
5589         return priv;
5590 }
5591
5592 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5593                            struct nft_set_elem *elem, u32 flags)
5594 {
5595         void *priv;
5596
5597         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5598                 priv = set->ops->get(ctx->net, set, elem, flags);
5599                 if (IS_ERR(priv))
5600                         return PTR_ERR(priv);
5601         } else {
5602                 priv = nft_setelem_catchall_get(ctx->net, set);
5603                 if (!priv)
5604                         return -ENOENT;
5605         }
5606         elem->priv = priv;
5607
5608         return 0;
5609 }
5610
5611 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5612                             const struct nlattr *attr)
5613 {
5614         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5615         struct nft_set_elem elem;
5616         struct sk_buff *skb;
5617         uint32_t flags = 0;
5618         int err;
5619
5620         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5621                                           nft_set_elem_policy, NULL);
5622         if (err < 0)
5623                 return err;
5624
5625         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5626         if (err < 0)
5627                 return err;
5628
5629         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5630                 return -EINVAL;
5631
5632         if (nla[NFTA_SET_ELEM_KEY]) {
5633                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5634                                             nla[NFTA_SET_ELEM_KEY]);
5635                 if (err < 0)
5636                         return err;
5637         }
5638
5639         if (nla[NFTA_SET_ELEM_KEY_END]) {
5640                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5641                                             nla[NFTA_SET_ELEM_KEY_END]);
5642                 if (err < 0)
5643                         return err;
5644         }
5645
5646         err = nft_setelem_get(ctx, set, &elem, flags);
5647         if (err < 0)
5648                 return err;
5649
5650         err = -ENOMEM;
5651         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5652         if (skb == NULL)
5653                 return err;
5654
5655         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5656                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
5657         if (err < 0)
5658                 goto err_fill_setelem;
5659
5660         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5661
5662 err_fill_setelem:
5663         kfree_skb(skb);
5664         return err;
5665 }
5666
5667 /* called with rcu_read_lock held */
5668 static int nf_tables_getsetelem(struct sk_buff *skb,
5669                                 const struct nfnl_info *info,
5670                                 const struct nlattr * const nla[])
5671 {
5672         struct netlink_ext_ack *extack = info->extack;
5673         u8 genmask = nft_genmask_cur(info->net);
5674         u8 family = info->nfmsg->nfgen_family;
5675         struct net *net = info->net;
5676         struct nft_table *table;
5677         struct nft_set *set;
5678         struct nlattr *attr;
5679         struct nft_ctx ctx;
5680         int rem, err = 0;
5681
5682         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5683                                  genmask, 0);
5684         if (IS_ERR(table)) {
5685                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5686                 return PTR_ERR(table);
5687         }
5688
5689         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5690         if (IS_ERR(set))
5691                 return PTR_ERR(set);
5692
5693         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5694
5695         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5696                 struct netlink_dump_control c = {
5697                         .start = nf_tables_dump_set_start,
5698                         .dump = nf_tables_dump_set,
5699                         .done = nf_tables_dump_set_done,
5700                         .module = THIS_MODULE,
5701                 };
5702                 struct nft_set_dump_ctx dump_ctx = {
5703                         .set = set,
5704                         .ctx = ctx,
5705                 };
5706
5707                 c.data = &dump_ctx;
5708                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5709         }
5710
5711         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5712                 return -EINVAL;
5713
5714         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5715                 err = nft_get_set_elem(&ctx, set, attr);
5716                 if (err < 0) {
5717                         NL_SET_BAD_ATTR(extack, attr);
5718                         break;
5719                 }
5720         }
5721
5722         return err;
5723 }
5724
5725 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5726                                      const struct nft_set *set,
5727                                      const struct nft_set_elem *elem,
5728                                      int event)
5729 {
5730         struct nftables_pernet *nft_net;
5731         struct net *net = ctx->net;
5732         u32 portid = ctx->portid;
5733         struct sk_buff *skb;
5734         u16 flags = 0;
5735         int err;
5736
5737         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5738                 return;
5739
5740         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5741         if (skb == NULL)
5742                 goto err;
5743
5744         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5745                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5746
5747         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5748                                           set, elem);
5749         if (err < 0) {
5750                 kfree_skb(skb);
5751                 goto err;
5752         }
5753
5754         nft_net = nft_pernet(net);
5755         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5756         return;
5757 err:
5758         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5759 }
5760
5761 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5762                                               int msg_type,
5763                                               struct nft_set *set)
5764 {
5765         struct nft_trans *trans;
5766
5767         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5768         if (trans == NULL)
5769                 return NULL;
5770
5771         nft_trans_elem_set(trans) = set;
5772         return trans;
5773 }
5774
5775 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5776                                          const struct nft_set *set,
5777                                          const struct nlattr *attr)
5778 {
5779         struct nft_expr *expr;
5780         int err;
5781
5782         expr = nft_expr_init(ctx, attr);
5783         if (IS_ERR(expr))
5784                 return expr;
5785
5786         err = -EOPNOTSUPP;
5787         if (expr->ops->type->flags & NFT_EXPR_GC) {
5788                 if (set->flags & NFT_SET_TIMEOUT)
5789                         goto err_set_elem_expr;
5790                 if (!set->ops->gc_init)
5791                         goto err_set_elem_expr;
5792                 set->ops->gc_init(set);
5793         }
5794
5795         return expr;
5796
5797 err_set_elem_expr:
5798         nft_expr_destroy(ctx, expr);
5799         return ERR_PTR(err);
5800 }
5801
5802 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
5803 {
5804         len += nft_set_ext_types[id].len;
5805         if (len > tmpl->ext_len[id] ||
5806             len > U8_MAX)
5807                 return -1;
5808
5809         return 0;
5810 }
5811
5812 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
5813                               void *to, const void *from, u32 len)
5814 {
5815         if (nft_set_ext_check(tmpl, id, len) < 0)
5816                 return -1;
5817
5818         memcpy(to, from, len);
5819
5820         return 0;
5821 }
5822
5823 void *nft_set_elem_init(const struct nft_set *set,
5824                         const struct nft_set_ext_tmpl *tmpl,
5825                         const u32 *key, const u32 *key_end,
5826                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5827 {
5828         struct nft_set_ext *ext;
5829         void *elem;
5830
5831         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5832         if (elem == NULL)
5833                 return ERR_PTR(-ENOMEM);
5834
5835         ext = nft_set_elem_ext(set, elem);
5836         nft_set_ext_init(ext, tmpl);
5837
5838         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5839             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
5840                                nft_set_ext_key(ext), key, set->klen) < 0)
5841                 goto err_ext_check;
5842
5843         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5844             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
5845                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
5846                 goto err_ext_check;
5847
5848         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5849             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
5850                                nft_set_ext_data(ext), data, set->dlen) < 0)
5851                 goto err_ext_check;
5852
5853         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5854                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5855                 if (expiration == 0)
5856                         *nft_set_ext_expiration(ext) += timeout;
5857         }
5858         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5859                 *nft_set_ext_timeout(ext) = timeout;
5860
5861         return elem;
5862
5863 err_ext_check:
5864         kfree(elem);
5865
5866         return ERR_PTR(-EINVAL);
5867 }
5868
5869 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5870                                         struct nft_expr *expr)
5871 {
5872         if (expr->ops->destroy_clone) {
5873                 expr->ops->destroy_clone(ctx, expr);
5874                 module_put(expr->ops->type->owner);
5875         } else {
5876                 nf_tables_expr_destroy(ctx, expr);
5877         }
5878 }
5879
5880 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5881                                       struct nft_set_elem_expr *elem_expr)
5882 {
5883         struct nft_expr *expr;
5884         u32 size;
5885
5886         nft_setelem_expr_foreach(expr, elem_expr, size)
5887                 __nft_set_elem_expr_destroy(ctx, expr);
5888 }
5889
5890 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5891                           bool destroy_expr)
5892 {
5893         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5894         struct nft_ctx ctx = {
5895                 .net    = read_pnet(&set->net),
5896                 .family = set->table->family,
5897         };
5898
5899         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5900         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5901                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5902         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5903                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5904
5905         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5906                 (*nft_set_ext_obj(ext))->use--;
5907         kfree(elem);
5908 }
5909 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5910
5911 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5912  * with the refcounting from the preparation phase.
5913  */
5914 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5915                                        const struct nft_set *set, void *elem)
5916 {
5917         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5918
5919         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5920                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5921
5922         kfree(elem);
5923 }
5924
5925 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5926                             struct nft_expr *expr_array[])
5927 {
5928         struct nft_expr *expr;
5929         int err, i, k;
5930
5931         for (i = 0; i < set->num_exprs; i++) {
5932                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
5933                 if (!expr)
5934                         goto err_expr;
5935
5936                 err = nft_expr_clone(expr, set->exprs[i]);
5937                 if (err < 0) {
5938                         kfree(expr);
5939                         goto err_expr;
5940                 }
5941                 expr_array[i] = expr;
5942         }
5943
5944         return 0;
5945
5946 err_expr:
5947         for (k = i - 1; k >= 0; k--)
5948                 nft_expr_destroy(ctx, expr_array[k]);
5949
5950         return -ENOMEM;
5951 }
5952
5953 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5954                                    const struct nft_set_ext_tmpl *tmpl,
5955                                    const struct nft_set_ext *ext,
5956                                    struct nft_expr *expr_array[],
5957                                    u32 num_exprs)
5958 {
5959         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5960         u32 len = sizeof(struct nft_set_elem_expr);
5961         struct nft_expr *expr;
5962         int i, err;
5963
5964         if (num_exprs == 0)
5965                 return 0;
5966
5967         for (i = 0; i < num_exprs; i++)
5968                 len += expr_array[i]->ops->size;
5969
5970         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
5971                 return -EINVAL;
5972
5973         for (i = 0; i < num_exprs; i++) {
5974                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5975                 err = nft_expr_clone(expr, expr_array[i]);
5976                 if (err < 0)
5977                         goto err_elem_expr_setup;
5978
5979                 elem_expr->size += expr_array[i]->ops->size;
5980                 nft_expr_destroy(ctx, expr_array[i]);
5981                 expr_array[i] = NULL;
5982         }
5983
5984         return 0;
5985
5986 err_elem_expr_setup:
5987         for (; i < num_exprs; i++) {
5988                 nft_expr_destroy(ctx, expr_array[i]);
5989                 expr_array[i] = NULL;
5990         }
5991
5992         return -ENOMEM;
5993 }
5994
5995 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5996                                             const struct nft_set *set)
5997 {
5998         struct nft_set_elem_catchall *catchall;
5999         u8 genmask = nft_genmask_cur(net);
6000         struct nft_set_ext *ext;
6001
6002         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6003                 ext = nft_set_elem_ext(set, catchall->elem);
6004                 if (nft_set_elem_active(ext, genmask) &&
6005                     !nft_set_elem_expired(ext))
6006                         return ext;
6007         }
6008
6009         return NULL;
6010 }
6011 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6012
6013 void *nft_set_catchall_gc(const struct nft_set *set)
6014 {
6015         struct nft_set_elem_catchall *catchall, *next;
6016         struct nft_set_ext *ext;
6017         void *elem = NULL;
6018
6019         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6020                 ext = nft_set_elem_ext(set, catchall->elem);
6021
6022                 if (!nft_set_elem_expired(ext) ||
6023                     nft_set_elem_mark_busy(ext))
6024                         continue;
6025
6026                 elem = catchall->elem;
6027                 list_del_rcu(&catchall->list);
6028                 kfree_rcu(catchall, rcu);
6029                 break;
6030         }
6031
6032         return elem;
6033 }
6034 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
6035
6036 static int nft_setelem_catchall_insert(const struct net *net,
6037                                        struct nft_set *set,
6038                                        const struct nft_set_elem *elem,
6039                                        struct nft_set_ext **pext)
6040 {
6041         struct nft_set_elem_catchall *catchall;
6042         u8 genmask = nft_genmask_next(net);
6043         struct nft_set_ext *ext;
6044
6045         list_for_each_entry(catchall, &set->catchall_list, list) {
6046                 ext = nft_set_elem_ext(set, catchall->elem);
6047                 if (nft_set_elem_active(ext, genmask)) {
6048                         *pext = ext;
6049                         return -EEXIST;
6050                 }
6051         }
6052
6053         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6054         if (!catchall)
6055                 return -ENOMEM;
6056
6057         catchall->elem = elem->priv;
6058         list_add_tail_rcu(&catchall->list, &set->catchall_list);
6059
6060         return 0;
6061 }
6062
6063 static int nft_setelem_insert(const struct net *net,
6064                               struct nft_set *set,
6065                               const struct nft_set_elem *elem,
6066                               struct nft_set_ext **ext, unsigned int flags)
6067 {
6068         int ret;
6069
6070         if (flags & NFT_SET_ELEM_CATCHALL)
6071                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6072         else
6073                 ret = set->ops->insert(net, set, elem, ext);
6074
6075         return ret;
6076 }
6077
6078 static bool nft_setelem_is_catchall(const struct nft_set *set,
6079                                     const struct nft_set_elem *elem)
6080 {
6081         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6082
6083         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6084             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6085                 return true;
6086
6087         return false;
6088 }
6089
6090 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6091                                  struct nft_set_elem *elem)
6092 {
6093         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6094
6095         if (nft_setelem_is_catchall(set, elem)) {
6096                 nft_set_elem_change_active(net, set, ext);
6097                 nft_set_elem_clear_busy(ext);
6098         } else {
6099                 set->ops->activate(net, set, elem);
6100         }
6101 }
6102
6103 static int nft_setelem_catchall_deactivate(const struct net *net,
6104                                            struct nft_set *set,
6105                                            struct nft_set_elem *elem)
6106 {
6107         struct nft_set_elem_catchall *catchall;
6108         struct nft_set_ext *ext;
6109
6110         list_for_each_entry(catchall, &set->catchall_list, list) {
6111                 ext = nft_set_elem_ext(set, catchall->elem);
6112                 if (!nft_is_active(net, ext) ||
6113                     nft_set_elem_mark_busy(ext))
6114                         continue;
6115
6116                 kfree(elem->priv);
6117                 elem->priv = catchall->elem;
6118                 nft_set_elem_change_active(net, set, ext);
6119                 return 0;
6120         }
6121
6122         return -ENOENT;
6123 }
6124
6125 static int __nft_setelem_deactivate(const struct net *net,
6126                                     struct nft_set *set,
6127                                     struct nft_set_elem *elem)
6128 {
6129         void *priv;
6130
6131         priv = set->ops->deactivate(net, set, elem);
6132         if (!priv)
6133                 return -ENOENT;
6134
6135         kfree(elem->priv);
6136         elem->priv = priv;
6137         set->ndeact++;
6138
6139         return 0;
6140 }
6141
6142 static int nft_setelem_deactivate(const struct net *net,
6143                                   struct nft_set *set,
6144                                   struct nft_set_elem *elem, u32 flags)
6145 {
6146         int ret;
6147
6148         if (flags & NFT_SET_ELEM_CATCHALL)
6149                 ret = nft_setelem_catchall_deactivate(net, set, elem);
6150         else
6151                 ret = __nft_setelem_deactivate(net, set, elem);
6152
6153         return ret;
6154 }
6155
6156 static void nft_setelem_catchall_remove(const struct net *net,
6157                                         const struct nft_set *set,
6158                                         const struct nft_set_elem *elem)
6159 {
6160         struct nft_set_elem_catchall *catchall, *next;
6161
6162         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6163                 if (catchall->elem == elem->priv) {
6164                         list_del_rcu(&catchall->list);
6165                         kfree_rcu(catchall, rcu);
6166                         break;
6167                 }
6168         }
6169 }
6170
6171 static void nft_setelem_remove(const struct net *net,
6172                                const struct nft_set *set,
6173                                const struct nft_set_elem *elem)
6174 {
6175         if (nft_setelem_is_catchall(set, elem))
6176                 nft_setelem_catchall_remove(net, set, elem);
6177         else
6178                 set->ops->remove(net, set, elem);
6179 }
6180
6181 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6182                                       struct nlattr **nla, u32 flags)
6183 {
6184         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6185                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6186                 if (flags & NFT_SET_ELEM_INTERVAL_END)
6187                         return false;
6188
6189                 if (nla[NFTA_SET_ELEM_KEY_END] &&
6190                     flags & NFT_SET_ELEM_CATCHALL)
6191                         return false;
6192         } else {
6193                 if (nla[NFTA_SET_ELEM_KEY_END])
6194                         return false;
6195         }
6196
6197         return true;
6198 }
6199
6200 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6201                             const struct nlattr *attr, u32 nlmsg_flags)
6202 {
6203         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6204         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6205         u8 genmask = nft_genmask_next(ctx->net);
6206         u32 flags = 0, size = 0, num_exprs = 0;
6207         struct nft_set_ext_tmpl tmpl;
6208         struct nft_set_ext *ext, *ext2;
6209         struct nft_set_elem elem;
6210         struct nft_set_binding *binding;
6211         struct nft_object *obj = NULL;
6212         struct nft_userdata *udata;
6213         struct nft_data_desc desc;
6214         enum nft_registers dreg;
6215         struct nft_trans *trans;
6216         u64 timeout;
6217         u64 expiration;
6218         int err, i;
6219         u8 ulen;
6220
6221         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6222                                           nft_set_elem_policy, NULL);
6223         if (err < 0)
6224                 return err;
6225
6226         nft_set_ext_prepare(&tmpl);
6227
6228         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6229         if (err < 0)
6230                 return err;
6231
6232         if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6233             (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6234                 return -EINVAL;
6235
6236         if (flags != 0) {
6237                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6238                 if (err < 0)
6239                         return err;
6240         }
6241
6242         if (set->flags & NFT_SET_MAP) {
6243                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6244                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6245                         return -EINVAL;
6246         } else {
6247                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6248                         return -EINVAL;
6249         }
6250
6251         if (set->flags & NFT_SET_OBJECT) {
6252                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6253                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6254                         return -EINVAL;
6255         } else {
6256                 if (nla[NFTA_SET_ELEM_OBJREF])
6257                         return -EINVAL;
6258         }
6259
6260         if (!nft_setelem_valid_key_end(set, nla, flags))
6261                 return -EINVAL;
6262
6263         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6264              (nla[NFTA_SET_ELEM_DATA] ||
6265               nla[NFTA_SET_ELEM_OBJREF] ||
6266               nla[NFTA_SET_ELEM_TIMEOUT] ||
6267               nla[NFTA_SET_ELEM_EXPIRATION] ||
6268               nla[NFTA_SET_ELEM_USERDATA] ||
6269               nla[NFTA_SET_ELEM_EXPR] ||
6270               nla[NFTA_SET_ELEM_KEY_END] ||
6271               nla[NFTA_SET_ELEM_EXPRESSIONS]))
6272                 return -EINVAL;
6273
6274         timeout = 0;
6275         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6276                 if (!(set->flags & NFT_SET_TIMEOUT))
6277                         return -EINVAL;
6278                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6279                                             &timeout);
6280                 if (err)
6281                         return err;
6282         } else if (set->flags & NFT_SET_TIMEOUT &&
6283                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6284                 timeout = READ_ONCE(set->timeout);
6285         }
6286
6287         expiration = 0;
6288         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6289                 if (!(set->flags & NFT_SET_TIMEOUT))
6290                         return -EINVAL;
6291                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6292                                             &expiration);
6293                 if (err)
6294                         return err;
6295         }
6296
6297         if (nla[NFTA_SET_ELEM_EXPR]) {
6298                 struct nft_expr *expr;
6299
6300                 if (set->num_exprs && set->num_exprs != 1)
6301                         return -EOPNOTSUPP;
6302
6303                 expr = nft_set_elem_expr_alloc(ctx, set,
6304                                                nla[NFTA_SET_ELEM_EXPR]);
6305                 if (IS_ERR(expr))
6306                         return PTR_ERR(expr);
6307
6308                 expr_array[0] = expr;
6309                 num_exprs = 1;
6310
6311                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6312                         err = -EOPNOTSUPP;
6313                         goto err_set_elem_expr;
6314                 }
6315         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6316                 struct nft_expr *expr;
6317                 struct nlattr *tmp;
6318                 int left;
6319
6320                 i = 0;
6321                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6322                         if (i == NFT_SET_EXPR_MAX ||
6323                             (set->num_exprs && set->num_exprs == i)) {
6324                                 err = -E2BIG;
6325                                 goto err_set_elem_expr;
6326                         }
6327                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6328                                 err = -EINVAL;
6329                                 goto err_set_elem_expr;
6330                         }
6331                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6332                         if (IS_ERR(expr)) {
6333                                 err = PTR_ERR(expr);
6334                                 goto err_set_elem_expr;
6335                         }
6336                         expr_array[i] = expr;
6337                         num_exprs++;
6338
6339                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6340                                 err = -EOPNOTSUPP;
6341                                 goto err_set_elem_expr;
6342                         }
6343                         i++;
6344                 }
6345                 if (set->num_exprs && set->num_exprs != i) {
6346                         err = -EOPNOTSUPP;
6347                         goto err_set_elem_expr;
6348                 }
6349         } else if (set->num_exprs > 0 &&
6350                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6351                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6352                 if (err < 0)
6353                         goto err_set_elem_expr_clone;
6354
6355                 num_exprs = set->num_exprs;
6356         }
6357
6358         if (nla[NFTA_SET_ELEM_KEY]) {
6359                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6360                                             nla[NFTA_SET_ELEM_KEY]);
6361                 if (err < 0)
6362                         goto err_set_elem_expr;
6363
6364                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6365                 if (err < 0)
6366                         goto err_parse_key;
6367         }
6368
6369         if (nla[NFTA_SET_ELEM_KEY_END]) {
6370                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6371                                             nla[NFTA_SET_ELEM_KEY_END]);
6372                 if (err < 0)
6373                         goto err_parse_key;
6374
6375                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6376                 if (err < 0)
6377                         goto err_parse_key_end;
6378         }
6379
6380         if (timeout > 0) {
6381                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6382                 if (err < 0)
6383                         goto err_parse_key_end;
6384
6385                 if (timeout != READ_ONCE(set->timeout)) {
6386                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6387                         if (err < 0)
6388                                 goto err_parse_key_end;
6389                 }
6390         }
6391
6392         if (num_exprs) {
6393                 for (i = 0; i < num_exprs; i++)
6394                         size += expr_array[i]->ops->size;
6395
6396                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6397                                              sizeof(struct nft_set_elem_expr) + size);
6398                 if (err < 0)
6399                         goto err_parse_key_end;
6400         }
6401
6402         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6403                 obj = nft_obj_lookup(ctx->net, ctx->table,
6404                                      nla[NFTA_SET_ELEM_OBJREF],
6405                                      set->objtype, genmask);
6406                 if (IS_ERR(obj)) {
6407                         err = PTR_ERR(obj);
6408                         goto err_parse_key_end;
6409                 }
6410                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6411                 if (err < 0)
6412                         goto err_parse_key_end;
6413         }
6414
6415         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6416                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6417                                              nla[NFTA_SET_ELEM_DATA]);
6418                 if (err < 0)
6419                         goto err_parse_key_end;
6420
6421                 dreg = nft_type_to_reg(set->dtype);
6422                 list_for_each_entry(binding, &set->bindings, list) {
6423                         struct nft_ctx bind_ctx = {
6424                                 .net    = ctx->net,
6425                                 .family = ctx->family,
6426                                 .table  = ctx->table,
6427                                 .chain  = (struct nft_chain *)binding->chain,
6428                         };
6429
6430                         if (!(binding->flags & NFT_SET_MAP))
6431                                 continue;
6432
6433                         err = nft_validate_register_store(&bind_ctx, dreg,
6434                                                           &elem.data.val,
6435                                                           desc.type, desc.len);
6436                         if (err < 0)
6437                                 goto err_parse_data;
6438
6439                         if (desc.type == NFT_DATA_VERDICT &&
6440                             (elem.data.val.verdict.code == NFT_GOTO ||
6441                              elem.data.val.verdict.code == NFT_JUMP))
6442                                 nft_validate_state_update(ctx->table,
6443                                                           NFT_VALIDATE_NEED);
6444                 }
6445
6446                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6447                 if (err < 0)
6448                         goto err_parse_data;
6449         }
6450
6451         /* The full maximum length of userdata can exceed the maximum
6452          * offset value (U8_MAX) for following extensions, therefor it
6453          * must be the last extension added.
6454          */
6455         ulen = 0;
6456         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6457                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6458                 if (ulen > 0) {
6459                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6460                                                      ulen);
6461                         if (err < 0)
6462                                 goto err_parse_data;
6463                 }
6464         }
6465
6466         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6467                                       elem.key_end.val.data, elem.data.val.data,
6468                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6469         if (IS_ERR(elem.priv)) {
6470                 err = PTR_ERR(elem.priv);
6471                 goto err_parse_data;
6472         }
6473
6474         ext = nft_set_elem_ext(set, elem.priv);
6475         if (flags)
6476                 *nft_set_ext_flags(ext) = flags;
6477
6478         if (ulen > 0) {
6479                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6480                         err = -EINVAL;
6481                         goto err_elem_userdata;
6482                 }
6483                 udata = nft_set_ext_userdata(ext);
6484                 udata->len = ulen - 1;
6485                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6486         }
6487         if (obj) {
6488                 *nft_set_ext_obj(ext) = obj;
6489                 obj->use++;
6490         }
6491         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6492         if (err < 0)
6493                 goto err_elem_free;
6494
6495         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6496         if (trans == NULL) {
6497                 err = -ENOMEM;
6498                 goto err_elem_free;
6499         }
6500
6501         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6502
6503         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6504         if (err) {
6505                 if (err == -EEXIST) {
6506                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6507                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6508                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6509                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6510                                 goto err_element_clash;
6511                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6512                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6513                              memcmp(nft_set_ext_data(ext),
6514                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6515                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6516                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6517                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6518                                 goto err_element_clash;
6519                         else if (!(nlmsg_flags & NLM_F_EXCL))
6520                                 err = 0;
6521                 } else if (err == -ENOTEMPTY) {
6522                         /* ENOTEMPTY reports overlapping between this element
6523                          * and an existing one.
6524                          */
6525                         err = -EEXIST;
6526                 }
6527                 goto err_element_clash;
6528         }
6529
6530         if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6531             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6532                 err = -ENFILE;
6533                 goto err_set_full;
6534         }
6535
6536         nft_trans_elem(trans) = elem;
6537         nft_trans_commit_list_add_tail(ctx->net, trans);
6538         return 0;
6539
6540 err_set_full:
6541         nft_setelem_remove(ctx->net, set, &elem);
6542 err_element_clash:
6543         kfree(trans);
6544 err_elem_free:
6545         if (obj)
6546                 obj->use--;
6547 err_elem_userdata:
6548         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6549 err_parse_data:
6550         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6551                 nft_data_release(&elem.data.val, desc.type);
6552 err_parse_key_end:
6553         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6554 err_parse_key:
6555         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6556 err_set_elem_expr:
6557         for (i = 0; i < num_exprs && expr_array[i]; i++)
6558                 nft_expr_destroy(ctx, expr_array[i]);
6559 err_set_elem_expr_clone:
6560         return err;
6561 }
6562
6563 static int nf_tables_newsetelem(struct sk_buff *skb,
6564                                 const struct nfnl_info *info,
6565                                 const struct nlattr * const nla[])
6566 {
6567         struct netlink_ext_ack *extack = info->extack;
6568         u8 genmask = nft_genmask_next(info->net);
6569         u8 family = info->nfmsg->nfgen_family;
6570         struct net *net = info->net;
6571         const struct nlattr *attr;
6572         struct nft_table *table;
6573         struct nft_set *set;
6574         struct nft_ctx ctx;
6575         int rem, err;
6576
6577         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6578                 return -EINVAL;
6579
6580         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6581                                  genmask, NETLINK_CB(skb).portid);
6582         if (IS_ERR(table)) {
6583                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6584                 return PTR_ERR(table);
6585         }
6586
6587         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6588                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6589         if (IS_ERR(set))
6590                 return PTR_ERR(set);
6591
6592         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6593                 return -EBUSY;
6594
6595         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6596
6597         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6598                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6599                 if (err < 0) {
6600                         NL_SET_BAD_ATTR(extack, attr);
6601                         return err;
6602                 }
6603         }
6604
6605         if (table->validate_state == NFT_VALIDATE_DO)
6606                 return nft_table_validate(net, table);
6607
6608         return 0;
6609 }
6610
6611 /**
6612  *      nft_data_hold - hold a nft_data item
6613  *
6614  *      @data: struct nft_data to release
6615  *      @type: type of data
6616  *
6617  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6618  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6619  *      NFT_GOTO verdicts. This function must be called on active data objects
6620  *      from the second phase of the commit protocol.
6621  */
6622 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6623 {
6624         struct nft_chain *chain;
6625         struct nft_rule *rule;
6626
6627         if (type == NFT_DATA_VERDICT) {
6628                 switch (data->verdict.code) {
6629                 case NFT_JUMP:
6630                 case NFT_GOTO:
6631                         chain = data->verdict.chain;
6632                         chain->use++;
6633
6634                         if (!nft_chain_is_bound(chain))
6635                                 break;
6636
6637                         chain->table->use++;
6638                         list_for_each_entry(rule, &chain->rules, list)
6639                                 chain->use++;
6640
6641                         nft_chain_add(chain->table, chain);
6642                         break;
6643                 }
6644         }
6645 }
6646
6647 static void nft_setelem_data_activate(const struct net *net,
6648                                       const struct nft_set *set,
6649                                       struct nft_set_elem *elem)
6650 {
6651         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6652
6653         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6654                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6655         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6656                 (*nft_set_ext_obj(ext))->use++;
6657 }
6658
6659 static void nft_setelem_data_deactivate(const struct net *net,
6660                                         const struct nft_set *set,
6661                                         struct nft_set_elem *elem)
6662 {
6663         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6664
6665         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6666                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6667         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6668                 (*nft_set_ext_obj(ext))->use--;
6669 }
6670
6671 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6672                            const struct nlattr *attr)
6673 {
6674         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6675         struct nft_set_ext_tmpl tmpl;
6676         struct nft_set_elem elem;
6677         struct nft_set_ext *ext;
6678         struct nft_trans *trans;
6679         u32 flags = 0;
6680         int err;
6681
6682         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6683                                           nft_set_elem_policy, NULL);
6684         if (err < 0)
6685                 return err;
6686
6687         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6688         if (err < 0)
6689                 return err;
6690
6691         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6692                 return -EINVAL;
6693
6694         if (!nft_setelem_valid_key_end(set, nla, flags))
6695                 return -EINVAL;
6696
6697         nft_set_ext_prepare(&tmpl);
6698
6699         if (flags != 0) {
6700                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6701                 if (err < 0)
6702                         return err;
6703         }
6704
6705         if (nla[NFTA_SET_ELEM_KEY]) {
6706                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6707                                             nla[NFTA_SET_ELEM_KEY]);
6708                 if (err < 0)
6709                         return err;
6710
6711                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6712                 if (err < 0)
6713                         goto fail_elem;
6714         }
6715
6716         if (nla[NFTA_SET_ELEM_KEY_END]) {
6717                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6718                                             nla[NFTA_SET_ELEM_KEY_END]);
6719                 if (err < 0)
6720                         goto fail_elem;
6721
6722                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6723                 if (err < 0)
6724                         goto fail_elem_key_end;
6725         }
6726
6727         err = -ENOMEM;
6728         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6729                                       elem.key_end.val.data, NULL, 0, 0,
6730                                       GFP_KERNEL_ACCOUNT);
6731         if (IS_ERR(elem.priv)) {
6732                 err = PTR_ERR(elem.priv);
6733                 goto fail_elem_key_end;
6734         }
6735
6736         ext = nft_set_elem_ext(set, elem.priv);
6737         if (flags)
6738                 *nft_set_ext_flags(ext) = flags;
6739
6740         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6741         if (trans == NULL)
6742                 goto fail_trans;
6743
6744         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6745         if (err < 0)
6746                 goto fail_ops;
6747
6748         nft_setelem_data_deactivate(ctx->net, set, &elem);
6749
6750         nft_trans_elem(trans) = elem;
6751         nft_trans_commit_list_add_tail(ctx->net, trans);
6752         return 0;
6753
6754 fail_ops:
6755         kfree(trans);
6756 fail_trans:
6757         kfree(elem.priv);
6758 fail_elem_key_end:
6759         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6760 fail_elem:
6761         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6762         return err;
6763 }
6764
6765 static int nft_setelem_flush(const struct nft_ctx *ctx,
6766                              struct nft_set *set,
6767                              const struct nft_set_iter *iter,
6768                              struct nft_set_elem *elem)
6769 {
6770         struct nft_trans *trans;
6771         int err;
6772
6773         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6774                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
6775         if (!trans)
6776                 return -ENOMEM;
6777
6778         if (!set->ops->flush(ctx->net, set, elem->priv)) {
6779                 err = -ENOENT;
6780                 goto err1;
6781         }
6782         set->ndeact++;
6783
6784         nft_setelem_data_deactivate(ctx->net, set, elem);
6785         nft_trans_elem_set(trans) = set;
6786         nft_trans_elem(trans) = *elem;
6787         nft_trans_commit_list_add_tail(ctx->net, trans);
6788
6789         return 0;
6790 err1:
6791         kfree(trans);
6792         return err;
6793 }
6794
6795 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6796                                     struct nft_set *set,
6797                                     struct nft_set_elem *elem)
6798 {
6799         struct nft_trans *trans;
6800
6801         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6802                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
6803         if (!trans)
6804                 return -ENOMEM;
6805
6806         nft_setelem_data_deactivate(ctx->net, set, elem);
6807         nft_trans_elem_set(trans) = set;
6808         nft_trans_elem(trans) = *elem;
6809         nft_trans_commit_list_add_tail(ctx->net, trans);
6810
6811         return 0;
6812 }
6813
6814 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6815                                   struct nft_set *set)
6816 {
6817         u8 genmask = nft_genmask_next(ctx->net);
6818         struct nft_set_elem_catchall *catchall;
6819         struct nft_set_elem elem;
6820         struct nft_set_ext *ext;
6821         int ret = 0;
6822
6823         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6824                 ext = nft_set_elem_ext(set, catchall->elem);
6825                 if (!nft_set_elem_active(ext, genmask) ||
6826                     nft_set_elem_mark_busy(ext))
6827                         continue;
6828
6829                 elem.priv = catchall->elem;
6830                 ret = __nft_set_catchall_flush(ctx, set, &elem);
6831                 if (ret < 0)
6832                         break;
6833         }
6834
6835         return ret;
6836 }
6837
6838 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6839 {
6840         struct nft_set_iter iter = {
6841                 .genmask        = genmask,
6842                 .fn             = nft_setelem_flush,
6843         };
6844
6845         set->ops->walk(ctx, set, &iter);
6846         if (!iter.err)
6847                 iter.err = nft_set_catchall_flush(ctx, set);
6848
6849         return iter.err;
6850 }
6851
6852 static int nf_tables_delsetelem(struct sk_buff *skb,
6853                                 const struct nfnl_info *info,
6854                                 const struct nlattr * const nla[])
6855 {
6856         struct netlink_ext_ack *extack = info->extack;
6857         u8 genmask = nft_genmask_next(info->net);
6858         u8 family = info->nfmsg->nfgen_family;
6859         struct net *net = info->net;
6860         const struct nlattr *attr;
6861         struct nft_table *table;
6862         struct nft_set *set;
6863         struct nft_ctx ctx;
6864         int rem, err = 0;
6865
6866         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6867                                  genmask, NETLINK_CB(skb).portid);
6868         if (IS_ERR(table)) {
6869                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6870                 return PTR_ERR(table);
6871         }
6872
6873         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6874         if (IS_ERR(set))
6875                 return PTR_ERR(set);
6876         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6877                 return -EBUSY;
6878
6879         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6880
6881         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6882                 return nft_set_flush(&ctx, set, genmask);
6883
6884         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6885                 err = nft_del_setelem(&ctx, set, attr);
6886                 if (err == -ENOENT &&
6887                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
6888                         continue;
6889
6890                 if (err < 0) {
6891                         NL_SET_BAD_ATTR(extack, attr);
6892                         break;
6893                 }
6894         }
6895         return err;
6896 }
6897
6898 void nft_set_gc_batch_release(struct rcu_head *rcu)
6899 {
6900         struct nft_set_gc_batch *gcb;
6901         unsigned int i;
6902
6903         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6904         for (i = 0; i < gcb->head.cnt; i++)
6905                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6906         kfree(gcb);
6907 }
6908
6909 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6910                                                 gfp_t gfp)
6911 {
6912         struct nft_set_gc_batch *gcb;
6913
6914         gcb = kzalloc(sizeof(*gcb), gfp);
6915         if (gcb == NULL)
6916                 return gcb;
6917         gcb->head.set = set;
6918         return gcb;
6919 }
6920
6921 /*
6922  * Stateful objects
6923  */
6924
6925 /**
6926  *      nft_register_obj- register nf_tables stateful object type
6927  *      @obj_type: object type
6928  *
6929  *      Registers the object type for use with nf_tables. Returns zero on
6930  *      success or a negative errno code otherwise.
6931  */
6932 int nft_register_obj(struct nft_object_type *obj_type)
6933 {
6934         if (obj_type->type == NFT_OBJECT_UNSPEC)
6935                 return -EINVAL;
6936
6937         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6938         list_add_rcu(&obj_type->list, &nf_tables_objects);
6939         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6940         return 0;
6941 }
6942 EXPORT_SYMBOL_GPL(nft_register_obj);
6943
6944 /**
6945  *      nft_unregister_obj - unregister nf_tables object type
6946  *      @obj_type: object type
6947  *
6948  *      Unregisters the object type for use with nf_tables.
6949  */
6950 void nft_unregister_obj(struct nft_object_type *obj_type)
6951 {
6952         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6953         list_del_rcu(&obj_type->list);
6954         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6955 }
6956 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6957
6958 struct nft_object *nft_obj_lookup(const struct net *net,
6959                                   const struct nft_table *table,
6960                                   const struct nlattr *nla, u32 objtype,
6961                                   u8 genmask)
6962 {
6963         struct nft_object_hash_key k = { .table = table };
6964         char search[NFT_OBJ_MAXNAMELEN];
6965         struct rhlist_head *tmp, *list;
6966         struct nft_object *obj;
6967
6968         nla_strscpy(search, nla, sizeof(search));
6969         k.name = search;
6970
6971         WARN_ON_ONCE(!rcu_read_lock_held() &&
6972                      !lockdep_commit_lock_is_held(net));
6973
6974         rcu_read_lock();
6975         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6976         if (!list)
6977                 goto out;
6978
6979         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6980                 if (objtype == obj->ops->type->type &&
6981                     nft_active_genmask(obj, genmask)) {
6982                         rcu_read_unlock();
6983                         return obj;
6984                 }
6985         }
6986 out:
6987         rcu_read_unlock();
6988         return ERR_PTR(-ENOENT);
6989 }
6990 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6991
6992 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6993                                                   const struct nlattr *nla,
6994                                                   u32 objtype, u8 genmask)
6995 {
6996         struct nft_object *obj;
6997
6998         list_for_each_entry(obj, &table->objects, list) {
6999                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7000                     objtype == obj->ops->type->type &&
7001                     nft_active_genmask(obj, genmask))
7002                         return obj;
7003         }
7004         return ERR_PTR(-ENOENT);
7005 }
7006
7007 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7008         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
7009                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
7010         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
7011                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
7012         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
7013         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
7014         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
7015         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
7016                                     .len = NFT_USERDATA_MAXLEN },
7017 };
7018
7019 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7020                                        const struct nft_object_type *type,
7021                                        const struct nlattr *attr)
7022 {
7023         struct nlattr **tb;
7024         const struct nft_object_ops *ops;
7025         struct nft_object *obj;
7026         int err = -ENOMEM;
7027
7028         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7029         if (!tb)
7030                 goto err1;
7031
7032         if (attr) {
7033                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7034                                                   type->policy, NULL);
7035                 if (err < 0)
7036                         goto err2;
7037         } else {
7038                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7039         }
7040
7041         if (type->select_ops) {
7042                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7043                 if (IS_ERR(ops)) {
7044                         err = PTR_ERR(ops);
7045                         goto err2;
7046                 }
7047         } else {
7048                 ops = type->ops;
7049         }
7050
7051         err = -ENOMEM;
7052         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7053         if (!obj)
7054                 goto err2;
7055
7056         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7057         if (err < 0)
7058                 goto err3;
7059
7060         obj->ops = ops;
7061
7062         kfree(tb);
7063         return obj;
7064 err3:
7065         kfree(obj);
7066 err2:
7067         kfree(tb);
7068 err1:
7069         return ERR_PTR(err);
7070 }
7071
7072 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7073                            struct nft_object *obj, bool reset)
7074 {
7075         struct nlattr *nest;
7076
7077         nest = nla_nest_start_noflag(skb, attr);
7078         if (!nest)
7079                 goto nla_put_failure;
7080         if (obj->ops->dump(skb, obj, reset) < 0)
7081                 goto nla_put_failure;
7082         nla_nest_end(skb, nest);
7083         return 0;
7084
7085 nla_put_failure:
7086         return -1;
7087 }
7088
7089 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
7090 {
7091         const struct nft_object_type *type;
7092
7093         list_for_each_entry(type, &nf_tables_objects, list) {
7094                 if (objtype == type->type)
7095                         return type;
7096         }
7097         return NULL;
7098 }
7099
7100 static const struct nft_object_type *
7101 nft_obj_type_get(struct net *net, u32 objtype)
7102 {
7103         const struct nft_object_type *type;
7104
7105         type = __nft_obj_type_get(objtype);
7106         if (type != NULL && try_module_get(type->owner))
7107                 return type;
7108
7109         lockdep_nfnl_nft_mutex_not_held();
7110 #ifdef CONFIG_MODULES
7111         if (type == NULL) {
7112                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7113                         return ERR_PTR(-EAGAIN);
7114         }
7115 #endif
7116         return ERR_PTR(-ENOENT);
7117 }
7118
7119 static int nf_tables_updobj(const struct nft_ctx *ctx,
7120                             const struct nft_object_type *type,
7121                             const struct nlattr *attr,
7122                             struct nft_object *obj)
7123 {
7124         struct nft_object *newobj;
7125         struct nft_trans *trans;
7126         int err = -ENOMEM;
7127
7128         if (!try_module_get(type->owner))
7129                 return -ENOENT;
7130
7131         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7132                                 sizeof(struct nft_trans_obj));
7133         if (!trans)
7134                 goto err_trans;
7135
7136         newobj = nft_obj_init(ctx, type, attr);
7137         if (IS_ERR(newobj)) {
7138                 err = PTR_ERR(newobj);
7139                 goto err_free_trans;
7140         }
7141
7142         nft_trans_obj(trans) = obj;
7143         nft_trans_obj_update(trans) = true;
7144         nft_trans_obj_newobj(trans) = newobj;
7145         nft_trans_commit_list_add_tail(ctx->net, trans);
7146
7147         return 0;
7148
7149 err_free_trans:
7150         kfree(trans);
7151 err_trans:
7152         module_put(type->owner);
7153         return err;
7154 }
7155
7156 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7157                             const struct nlattr * const nla[])
7158 {
7159         struct netlink_ext_ack *extack = info->extack;
7160         u8 genmask = nft_genmask_next(info->net);
7161         u8 family = info->nfmsg->nfgen_family;
7162         const struct nft_object_type *type;
7163         struct net *net = info->net;
7164         struct nft_table *table;
7165         struct nft_object *obj;
7166         struct nft_ctx ctx;
7167         u32 objtype;
7168         int err;
7169
7170         if (!nla[NFTA_OBJ_TYPE] ||
7171             !nla[NFTA_OBJ_NAME] ||
7172             !nla[NFTA_OBJ_DATA])
7173                 return -EINVAL;
7174
7175         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7176                                  NETLINK_CB(skb).portid);
7177         if (IS_ERR(table)) {
7178                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7179                 return PTR_ERR(table);
7180         }
7181
7182         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7183         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7184         if (IS_ERR(obj)) {
7185                 err = PTR_ERR(obj);
7186                 if (err != -ENOENT) {
7187                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7188                         return err;
7189                 }
7190         } else {
7191                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7192                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7193                         return -EEXIST;
7194                 }
7195                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7196                         return -EOPNOTSUPP;
7197
7198                 type = __nft_obj_type_get(objtype);
7199                 if (WARN_ON_ONCE(!type))
7200                         return -ENOENT;
7201
7202                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7203
7204                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7205         }
7206
7207         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7208
7209         type = nft_obj_type_get(net, objtype);
7210         if (IS_ERR(type))
7211                 return PTR_ERR(type);
7212
7213         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7214         if (IS_ERR(obj)) {
7215                 err = PTR_ERR(obj);
7216                 goto err_init;
7217         }
7218         obj->key.table = table;
7219         obj->handle = nf_tables_alloc_handle(table);
7220
7221         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7222         if (!obj->key.name) {
7223                 err = -ENOMEM;
7224                 goto err_strdup;
7225         }
7226
7227         if (nla[NFTA_OBJ_USERDATA]) {
7228                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7229                 if (obj->udata == NULL)
7230                         goto err_userdata;
7231
7232                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7233         }
7234
7235         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7236         if (err < 0)
7237                 goto err_trans;
7238
7239         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7240                               nft_objname_ht_params);
7241         if (err < 0)
7242                 goto err_obj_ht;
7243
7244         list_add_tail_rcu(&obj->list, &table->objects);
7245         table->use++;
7246         return 0;
7247 err_obj_ht:
7248         /* queued in transaction log */
7249         INIT_LIST_HEAD(&obj->list);
7250         return err;
7251 err_trans:
7252         kfree(obj->udata);
7253 err_userdata:
7254         kfree(obj->key.name);
7255 err_strdup:
7256         if (obj->ops->destroy)
7257                 obj->ops->destroy(&ctx, obj);
7258         kfree(obj);
7259 err_init:
7260         module_put(type->owner);
7261         return err;
7262 }
7263
7264 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7265                                    u32 portid, u32 seq, int event, u32 flags,
7266                                    int family, const struct nft_table *table,
7267                                    struct nft_object *obj, bool reset)
7268 {
7269         struct nlmsghdr *nlh;
7270
7271         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7272         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7273                            NFNETLINK_V0, nft_base_seq(net));
7274         if (!nlh)
7275                 goto nla_put_failure;
7276
7277         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7278             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7279             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7280                          NFTA_OBJ_PAD))
7281                 goto nla_put_failure;
7282
7283         if (event == NFT_MSG_DELOBJ) {
7284                 nlmsg_end(skb, nlh);
7285                 return 0;
7286         }
7287
7288         if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7289             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7290             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7291                 goto nla_put_failure;
7292
7293         if (obj->udata &&
7294             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7295                 goto nla_put_failure;
7296
7297         nlmsg_end(skb, nlh);
7298         return 0;
7299
7300 nla_put_failure:
7301         nlmsg_trim(skb, nlh);
7302         return -1;
7303 }
7304
7305 struct nft_obj_filter {
7306         char            *table;
7307         u32             type;
7308 };
7309
7310 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7311 {
7312         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7313         const struct nft_table *table;
7314         unsigned int idx = 0, s_idx = cb->args[0];
7315         struct nft_obj_filter *filter = cb->data;
7316         struct net *net = sock_net(skb->sk);
7317         int family = nfmsg->nfgen_family;
7318         struct nftables_pernet *nft_net;
7319         struct nft_object *obj;
7320         bool reset = false;
7321
7322         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7323                 reset = true;
7324
7325         rcu_read_lock();
7326         nft_net = nft_pernet(net);
7327         cb->seq = READ_ONCE(nft_net->base_seq);
7328
7329         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7330                 if (family != NFPROTO_UNSPEC && family != table->family)
7331                         continue;
7332
7333                 list_for_each_entry_rcu(obj, &table->objects, list) {
7334                         if (!nft_is_active(net, obj))
7335                                 goto cont;
7336                         if (idx < s_idx)
7337                                 goto cont;
7338                         if (idx > s_idx)
7339                                 memset(&cb->args[1], 0,
7340                                        sizeof(cb->args) - sizeof(cb->args[0]));
7341                         if (filter && filter->table &&
7342                             strcmp(filter->table, table->name))
7343                                 goto cont;
7344                         if (filter &&
7345                             filter->type != NFT_OBJECT_UNSPEC &&
7346                             obj->ops->type->type != filter->type)
7347                                 goto cont;
7348                         if (reset) {
7349                                 char *buf = kasprintf(GFP_ATOMIC,
7350                                                       "%s:%u",
7351                                                       table->name,
7352                                                       nft_net->base_seq);
7353
7354                                 audit_log_nfcfg(buf,
7355                                                 family,
7356                                                 obj->handle,
7357                                                 AUDIT_NFT_OP_OBJ_RESET,
7358                                                 GFP_ATOMIC);
7359                                 kfree(buf);
7360                         }
7361
7362                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7363                                                     cb->nlh->nlmsg_seq,
7364                                                     NFT_MSG_NEWOBJ,
7365                                                     NLM_F_MULTI | NLM_F_APPEND,
7366                                                     table->family, table,
7367                                                     obj, reset) < 0)
7368                                 goto done;
7369
7370                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7371 cont:
7372                         idx++;
7373                 }
7374         }
7375 done:
7376         rcu_read_unlock();
7377
7378         cb->args[0] = idx;
7379         return skb->len;
7380 }
7381
7382 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7383 {
7384         const struct nlattr * const *nla = cb->data;
7385         struct nft_obj_filter *filter = NULL;
7386
7387         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7388                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7389                 if (!filter)
7390                         return -ENOMEM;
7391
7392                 if (nla[NFTA_OBJ_TABLE]) {
7393                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7394                         if (!filter->table) {
7395                                 kfree(filter);
7396                                 return -ENOMEM;
7397                         }
7398                 }
7399
7400                 if (nla[NFTA_OBJ_TYPE])
7401                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7402         }
7403
7404         cb->data = filter;
7405         return 0;
7406 }
7407
7408 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7409 {
7410         struct nft_obj_filter *filter = cb->data;
7411
7412         if (filter) {
7413                 kfree(filter->table);
7414                 kfree(filter);
7415         }
7416
7417         return 0;
7418 }
7419
7420 /* called with rcu_read_lock held */
7421 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7422                             const struct nlattr * const nla[])
7423 {
7424         struct netlink_ext_ack *extack = info->extack;
7425         u8 genmask = nft_genmask_cur(info->net);
7426         u8 family = info->nfmsg->nfgen_family;
7427         const struct nft_table *table;
7428         struct net *net = info->net;
7429         struct nft_object *obj;
7430         struct sk_buff *skb2;
7431         bool reset = false;
7432         u32 objtype;
7433         int err;
7434
7435         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7436                 struct netlink_dump_control c = {
7437                         .start = nf_tables_dump_obj_start,
7438                         .dump = nf_tables_dump_obj,
7439                         .done = nf_tables_dump_obj_done,
7440                         .module = THIS_MODULE,
7441                         .data = (void *)nla,
7442                 };
7443
7444                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7445         }
7446
7447         if (!nla[NFTA_OBJ_NAME] ||
7448             !nla[NFTA_OBJ_TYPE])
7449                 return -EINVAL;
7450
7451         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7452         if (IS_ERR(table)) {
7453                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7454                 return PTR_ERR(table);
7455         }
7456
7457         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7458         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7459         if (IS_ERR(obj)) {
7460                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7461                 return PTR_ERR(obj);
7462         }
7463
7464         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7465         if (!skb2)
7466                 return -ENOMEM;
7467
7468         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7469                 reset = true;
7470
7471         if (reset) {
7472                 const struct nftables_pernet *nft_net;
7473                 char *buf;
7474
7475                 nft_net = nft_pernet(net);
7476                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7477
7478                 audit_log_nfcfg(buf,
7479                                 family,
7480                                 obj->handle,
7481                                 AUDIT_NFT_OP_OBJ_RESET,
7482                                 GFP_ATOMIC);
7483                 kfree(buf);
7484         }
7485
7486         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7487                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7488                                       family, table, obj, reset);
7489         if (err < 0)
7490                 goto err_fill_obj_info;
7491
7492         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7493
7494 err_fill_obj_info:
7495         kfree_skb(skb2);
7496         return err;
7497 }
7498
7499 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7500 {
7501         if (obj->ops->destroy)
7502                 obj->ops->destroy(ctx, obj);
7503
7504         module_put(obj->ops->type->owner);
7505         kfree(obj->key.name);
7506         kfree(obj->udata);
7507         kfree(obj);
7508 }
7509
7510 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7511                             const struct nlattr * const nla[])
7512 {
7513         struct netlink_ext_ack *extack = info->extack;
7514         u8 genmask = nft_genmask_next(info->net);
7515         u8 family = info->nfmsg->nfgen_family;
7516         struct net *net = info->net;
7517         const struct nlattr *attr;
7518         struct nft_table *table;
7519         struct nft_object *obj;
7520         struct nft_ctx ctx;
7521         u32 objtype;
7522
7523         if (!nla[NFTA_OBJ_TYPE] ||
7524             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7525                 return -EINVAL;
7526
7527         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7528                                  NETLINK_CB(skb).portid);
7529         if (IS_ERR(table)) {
7530                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7531                 return PTR_ERR(table);
7532         }
7533
7534         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7535         if (nla[NFTA_OBJ_HANDLE]) {
7536                 attr = nla[NFTA_OBJ_HANDLE];
7537                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7538         } else {
7539                 attr = nla[NFTA_OBJ_NAME];
7540                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7541         }
7542
7543         if (IS_ERR(obj)) {
7544                 if (PTR_ERR(obj) == -ENOENT &&
7545                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7546                         return 0;
7547
7548                 NL_SET_BAD_ATTR(extack, attr);
7549                 return PTR_ERR(obj);
7550         }
7551         if (obj->use > 0) {
7552                 NL_SET_BAD_ATTR(extack, attr);
7553                 return -EBUSY;
7554         }
7555
7556         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7557
7558         return nft_delobj(&ctx, obj);
7559 }
7560
7561 void nft_obj_notify(struct net *net, const struct nft_table *table,
7562                     struct nft_object *obj, u32 portid, u32 seq, int event,
7563                     u16 flags, int family, int report, gfp_t gfp)
7564 {
7565         struct nftables_pernet *nft_net = nft_pernet(net);
7566         struct sk_buff *skb;
7567         int err;
7568         char *buf = kasprintf(gfp, "%s:%u",
7569                               table->name, nft_net->base_seq);
7570
7571         audit_log_nfcfg(buf,
7572                         family,
7573                         obj->handle,
7574                         event == NFT_MSG_NEWOBJ ?
7575                                  AUDIT_NFT_OP_OBJ_REGISTER :
7576                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7577                         gfp);
7578         kfree(buf);
7579
7580         if (!report &&
7581             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7582                 return;
7583
7584         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7585         if (skb == NULL)
7586                 goto err;
7587
7588         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7589                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7590                                       family, table, obj, false);
7591         if (err < 0) {
7592                 kfree_skb(skb);
7593                 goto err;
7594         }
7595
7596         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7597         return;
7598 err:
7599         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7600 }
7601 EXPORT_SYMBOL_GPL(nft_obj_notify);
7602
7603 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7604                                  struct nft_object *obj, int event)
7605 {
7606         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7607                        ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7608 }
7609
7610 /*
7611  * Flow tables
7612  */
7613 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7614 {
7615         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7616         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7617         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7618 }
7619 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7620
7621 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7622 {
7623         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7624         list_del_rcu(&type->list);
7625         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7626 }
7627 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7628
7629 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7630         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7631                                             .len = NFT_NAME_MAXLEN - 1 },
7632         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7633                                             .len = NFT_NAME_MAXLEN - 1 },
7634         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7635         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7636         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7637 };
7638
7639 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7640                                            const struct nlattr *nla, u8 genmask)
7641 {
7642         struct nft_flowtable *flowtable;
7643
7644         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7645                 if (!nla_strcmp(nla, flowtable->name) &&
7646                     nft_active_genmask(flowtable, genmask))
7647                         return flowtable;
7648         }
7649         return ERR_PTR(-ENOENT);
7650 }
7651 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7652
7653 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7654                                     struct nft_flowtable *flowtable,
7655                                     enum nft_trans_phase phase)
7656 {
7657         switch (phase) {
7658         case NFT_TRANS_PREPARE:
7659         case NFT_TRANS_ABORT:
7660         case NFT_TRANS_RELEASE:
7661                 flowtable->use--;
7662                 fallthrough;
7663         default:
7664                 return;
7665         }
7666 }
7667 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7668
7669 static struct nft_flowtable *
7670 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7671                               const struct nlattr *nla, u8 genmask)
7672 {
7673        struct nft_flowtable *flowtable;
7674
7675        list_for_each_entry(flowtable, &table->flowtables, list) {
7676                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7677                    nft_active_genmask(flowtable, genmask))
7678                        return flowtable;
7679        }
7680        return ERR_PTR(-ENOENT);
7681 }
7682
7683 struct nft_flowtable_hook {
7684         u32                     num;
7685         int                     priority;
7686         struct list_head        list;
7687 };
7688
7689 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7690         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
7691         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
7692         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
7693 };
7694
7695 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7696                                     const struct nlattr *attr,
7697                                     struct nft_flowtable_hook *flowtable_hook,
7698                                     struct nft_flowtable *flowtable,
7699                                     struct netlink_ext_ack *extack, bool add)
7700 {
7701         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7702         struct nft_hook *hook;
7703         int hooknum, priority;
7704         int err;
7705
7706         INIT_LIST_HEAD(&flowtable_hook->list);
7707
7708         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7709                                           nft_flowtable_hook_policy, NULL);
7710         if (err < 0)
7711                 return err;
7712
7713         if (add) {
7714                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7715                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7716                         return -EINVAL;
7717
7718                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7719                 if (hooknum != NF_NETDEV_INGRESS)
7720                         return -EOPNOTSUPP;
7721
7722                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7723
7724                 flowtable_hook->priority        = priority;
7725                 flowtable_hook->num             = hooknum;
7726         } else {
7727                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7728                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7729                         if (hooknum != flowtable->hooknum)
7730                                 return -EOPNOTSUPP;
7731                 }
7732
7733                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7734                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7735                         if (priority != flowtable->data.priority)
7736                                 return -EOPNOTSUPP;
7737                 }
7738
7739                 flowtable_hook->priority        = flowtable->data.priority;
7740                 flowtable_hook->num             = flowtable->hooknum;
7741         }
7742
7743         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7744                 err = nf_tables_parse_netdev_hooks(ctx->net,
7745                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
7746                                                    &flowtable_hook->list,
7747                                                    extack);
7748                 if (err < 0)
7749                         return err;
7750         }
7751
7752         list_for_each_entry(hook, &flowtable_hook->list, list) {
7753                 hook->ops.pf            = NFPROTO_NETDEV;
7754                 hook->ops.hooknum       = flowtable_hook->num;
7755                 hook->ops.priority      = flowtable_hook->priority;
7756                 hook->ops.priv          = &flowtable->data;
7757                 hook->ops.hook          = flowtable->data.type->hook;
7758         }
7759
7760         return err;
7761 }
7762
7763 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7764 {
7765         const struct nf_flowtable_type *type;
7766
7767         list_for_each_entry(type, &nf_tables_flowtables, list) {
7768                 if (family == type->family)
7769                         return type;
7770         }
7771         return NULL;
7772 }
7773
7774 static const struct nf_flowtable_type *
7775 nft_flowtable_type_get(struct net *net, u8 family)
7776 {
7777         const struct nf_flowtable_type *type;
7778
7779         type = __nft_flowtable_type_get(family);
7780         if (type != NULL && try_module_get(type->owner))
7781                 return type;
7782
7783         lockdep_nfnl_nft_mutex_not_held();
7784 #ifdef CONFIG_MODULES
7785         if (type == NULL) {
7786                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7787                         return ERR_PTR(-EAGAIN);
7788         }
7789 #endif
7790         return ERR_PTR(-ENOENT);
7791 }
7792
7793 /* Only called from error and netdev event paths. */
7794 static void nft_unregister_flowtable_hook(struct net *net,
7795                                           struct nft_flowtable *flowtable,
7796                                           struct nft_hook *hook)
7797 {
7798         nf_unregister_net_hook(net, &hook->ops);
7799         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7800                                     FLOW_BLOCK_UNBIND);
7801 }
7802
7803 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7804                                                  struct list_head *hook_list,
7805                                                  bool release_netdev)
7806 {
7807         struct nft_hook *hook, *next;
7808
7809         list_for_each_entry_safe(hook, next, hook_list, list) {
7810                 nf_unregister_net_hook(net, &hook->ops);
7811                 if (release_netdev) {
7812                         list_del(&hook->list);
7813                         kfree_rcu(hook, rcu);
7814                 }
7815         }
7816 }
7817
7818 static void nft_unregister_flowtable_net_hooks(struct net *net,
7819                                                struct list_head *hook_list)
7820 {
7821         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7822 }
7823
7824 static int nft_register_flowtable_net_hooks(struct net *net,
7825                                             struct nft_table *table,
7826                                             struct list_head *hook_list,
7827                                             struct nft_flowtable *flowtable)
7828 {
7829         struct nft_hook *hook, *hook2, *next;
7830         struct nft_flowtable *ft;
7831         int err, i = 0;
7832
7833         list_for_each_entry(hook, hook_list, list) {
7834                 list_for_each_entry(ft, &table->flowtables, list) {
7835                         if (!nft_is_active_next(net, ft))
7836                                 continue;
7837
7838                         list_for_each_entry(hook2, &ft->hook_list, list) {
7839                                 if (hook->ops.dev == hook2->ops.dev &&
7840                                     hook->ops.pf == hook2->ops.pf) {
7841                                         err = -EEXIST;
7842                                         goto err_unregister_net_hooks;
7843                                 }
7844                         }
7845                 }
7846
7847                 err = flowtable->data.type->setup(&flowtable->data,
7848                                                   hook->ops.dev,
7849                                                   FLOW_BLOCK_BIND);
7850                 if (err < 0)
7851                         goto err_unregister_net_hooks;
7852
7853                 err = nf_register_net_hook(net, &hook->ops);
7854                 if (err < 0) {
7855                         flowtable->data.type->setup(&flowtable->data,
7856                                                     hook->ops.dev,
7857                                                     FLOW_BLOCK_UNBIND);
7858                         goto err_unregister_net_hooks;
7859                 }
7860
7861                 i++;
7862         }
7863
7864         return 0;
7865
7866 err_unregister_net_hooks:
7867         list_for_each_entry_safe(hook, next, hook_list, list) {
7868                 if (i-- <= 0)
7869                         break;
7870
7871                 nft_unregister_flowtable_hook(net, flowtable, hook);
7872                 list_del_rcu(&hook->list);
7873                 kfree_rcu(hook, rcu);
7874         }
7875
7876         return err;
7877 }
7878
7879 static void nft_hooks_destroy(struct list_head *hook_list)
7880 {
7881         struct nft_hook *hook, *next;
7882
7883         list_for_each_entry_safe(hook, next, hook_list, list) {
7884                 list_del_rcu(&hook->list);
7885                 kfree_rcu(hook, rcu);
7886         }
7887 }
7888
7889 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7890                                 struct nft_flowtable *flowtable,
7891                                 struct netlink_ext_ack *extack)
7892 {
7893         const struct nlattr * const *nla = ctx->nla;
7894         struct nft_flowtable_hook flowtable_hook;
7895         struct nft_hook *hook, *next;
7896         struct nft_trans *trans;
7897         bool unregister = false;
7898         u32 flags;
7899         int err;
7900
7901         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7902                                        &flowtable_hook, flowtable, extack, false);
7903         if (err < 0)
7904                 return err;
7905
7906         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7907                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7908                         list_del(&hook->list);
7909                         kfree(hook);
7910                 }
7911         }
7912
7913         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7914                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7915                 if (flags & ~NFT_FLOWTABLE_MASK) {
7916                         err = -EOPNOTSUPP;
7917                         goto err_flowtable_update_hook;
7918                 }
7919                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7920                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7921                         err = -EOPNOTSUPP;
7922                         goto err_flowtable_update_hook;
7923                 }
7924         } else {
7925                 flags = flowtable->data.flags;
7926         }
7927
7928         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7929                                                &flowtable_hook.list, flowtable);
7930         if (err < 0)
7931                 goto err_flowtable_update_hook;
7932
7933         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7934                                 sizeof(struct nft_trans_flowtable));
7935         if (!trans) {
7936                 unregister = true;
7937                 err = -ENOMEM;
7938                 goto err_flowtable_update_hook;
7939         }
7940
7941         nft_trans_flowtable_flags(trans) = flags;
7942         nft_trans_flowtable(trans) = flowtable;
7943         nft_trans_flowtable_update(trans) = true;
7944         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7945         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7946
7947         nft_trans_commit_list_add_tail(ctx->net, trans);
7948
7949         return 0;
7950
7951 err_flowtable_update_hook:
7952         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7953                 if (unregister)
7954                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7955                 list_del_rcu(&hook->list);
7956                 kfree_rcu(hook, rcu);
7957         }
7958
7959         return err;
7960
7961 }
7962
7963 static int nf_tables_newflowtable(struct sk_buff *skb,
7964                                   const struct nfnl_info *info,
7965                                   const struct nlattr * const nla[])
7966 {
7967         struct netlink_ext_ack *extack = info->extack;
7968         struct nft_flowtable_hook flowtable_hook;
7969         u8 genmask = nft_genmask_next(info->net);
7970         u8 family = info->nfmsg->nfgen_family;
7971         const struct nf_flowtable_type *type;
7972         struct nft_flowtable *flowtable;
7973         struct nft_hook *hook, *next;
7974         struct net *net = info->net;
7975         struct nft_table *table;
7976         struct nft_ctx ctx;
7977         int err;
7978
7979         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7980             !nla[NFTA_FLOWTABLE_NAME] ||
7981             !nla[NFTA_FLOWTABLE_HOOK])
7982                 return -EINVAL;
7983
7984         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7985                                  genmask, NETLINK_CB(skb).portid);
7986         if (IS_ERR(table)) {
7987                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7988                 return PTR_ERR(table);
7989         }
7990
7991         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7992                                          genmask);
7993         if (IS_ERR(flowtable)) {
7994                 err = PTR_ERR(flowtable);
7995                 if (err != -ENOENT) {
7996                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7997                         return err;
7998                 }
7999         } else {
8000                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8001                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8002                         return -EEXIST;
8003                 }
8004
8005                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8006
8007                 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8008         }
8009
8010         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8011
8012         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8013         if (!flowtable)
8014                 return -ENOMEM;
8015
8016         flowtable->table = table;
8017         flowtable->handle = nf_tables_alloc_handle(table);
8018         INIT_LIST_HEAD(&flowtable->hook_list);
8019
8020         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8021         if (!flowtable->name) {
8022                 err = -ENOMEM;
8023                 goto err1;
8024         }
8025
8026         type = nft_flowtable_type_get(net, family);
8027         if (IS_ERR(type)) {
8028                 err = PTR_ERR(type);
8029                 goto err2;
8030         }
8031
8032         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8033                 flowtable->data.flags =
8034                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8035                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8036                         err = -EOPNOTSUPP;
8037                         goto err3;
8038                 }
8039         }
8040
8041         write_pnet(&flowtable->data.net, net);
8042         flowtable->data.type = type;
8043         err = type->init(&flowtable->data);
8044         if (err < 0)
8045                 goto err3;
8046
8047         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
8048                                        &flowtable_hook, flowtable, extack, true);
8049         if (err < 0)
8050                 goto err4;
8051
8052         list_splice(&flowtable_hook.list, &flowtable->hook_list);
8053         flowtable->data.priority = flowtable_hook.priority;
8054         flowtable->hooknum = flowtable_hook.num;
8055
8056         err = nft_register_flowtable_net_hooks(ctx.net, table,
8057                                                &flowtable->hook_list,
8058                                                flowtable);
8059         if (err < 0) {
8060                 nft_hooks_destroy(&flowtable->hook_list);
8061                 goto err4;
8062         }
8063
8064         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8065         if (err < 0)
8066                 goto err5;
8067
8068         list_add_tail_rcu(&flowtable->list, &table->flowtables);
8069         table->use++;
8070
8071         return 0;
8072 err5:
8073         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8074                 nft_unregister_flowtable_hook(net, flowtable, hook);
8075                 list_del_rcu(&hook->list);
8076                 kfree_rcu(hook, rcu);
8077         }
8078 err4:
8079         flowtable->data.type->free(&flowtable->data);
8080 err3:
8081         module_put(type->owner);
8082 err2:
8083         kfree(flowtable->name);
8084 err1:
8085         kfree(flowtable);
8086         return err;
8087 }
8088
8089 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8090 {
8091         struct nft_hook *this, *next;
8092
8093         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8094                 list_del(&this->list);
8095                 kfree(this);
8096         }
8097 }
8098
8099 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8100                                  struct nft_flowtable *flowtable,
8101                                  struct netlink_ext_ack *extack)
8102 {
8103         const struct nlattr * const *nla = ctx->nla;
8104         struct nft_flowtable_hook flowtable_hook;
8105         LIST_HEAD(flowtable_del_list);
8106         struct nft_hook *this, *hook;
8107         struct nft_trans *trans;
8108         int err;
8109
8110         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
8111                                        &flowtable_hook, flowtable, extack, false);
8112         if (err < 0)
8113                 return err;
8114
8115         list_for_each_entry(this, &flowtable_hook.list, list) {
8116                 hook = nft_hook_list_find(&flowtable->hook_list, this);
8117                 if (!hook) {
8118                         err = -ENOENT;
8119                         goto err_flowtable_del_hook;
8120                 }
8121                 list_move(&hook->list, &flowtable_del_list);
8122         }
8123
8124         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8125                                 sizeof(struct nft_trans_flowtable));
8126         if (!trans) {
8127                 err = -ENOMEM;
8128                 goto err_flowtable_del_hook;
8129         }
8130
8131         nft_trans_flowtable(trans) = flowtable;
8132         nft_trans_flowtable_update(trans) = true;
8133         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8134         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8135         nft_flowtable_hook_release(&flowtable_hook);
8136
8137         nft_trans_commit_list_add_tail(ctx->net, trans);
8138
8139         return 0;
8140
8141 err_flowtable_del_hook:
8142         list_splice(&flowtable_del_list, &flowtable->hook_list);
8143         nft_flowtable_hook_release(&flowtable_hook);
8144
8145         return err;
8146 }
8147
8148 static int nf_tables_delflowtable(struct sk_buff *skb,
8149                                   const struct nfnl_info *info,
8150                                   const struct nlattr * const nla[])
8151 {
8152         struct netlink_ext_ack *extack = info->extack;
8153         u8 genmask = nft_genmask_next(info->net);
8154         u8 family = info->nfmsg->nfgen_family;
8155         struct nft_flowtable *flowtable;
8156         struct net *net = info->net;
8157         const struct nlattr *attr;
8158         struct nft_table *table;
8159         struct nft_ctx ctx;
8160
8161         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8162             (!nla[NFTA_FLOWTABLE_NAME] &&
8163              !nla[NFTA_FLOWTABLE_HANDLE]))
8164                 return -EINVAL;
8165
8166         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8167                                  genmask, NETLINK_CB(skb).portid);
8168         if (IS_ERR(table)) {
8169                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8170                 return PTR_ERR(table);
8171         }
8172
8173         if (nla[NFTA_FLOWTABLE_HANDLE]) {
8174                 attr = nla[NFTA_FLOWTABLE_HANDLE];
8175                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8176         } else {
8177                 attr = nla[NFTA_FLOWTABLE_NAME];
8178                 flowtable = nft_flowtable_lookup(table, attr, genmask);
8179         }
8180
8181         if (IS_ERR(flowtable)) {
8182                 if (PTR_ERR(flowtable) == -ENOENT &&
8183                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8184                         return 0;
8185
8186                 NL_SET_BAD_ATTR(extack, attr);
8187                 return PTR_ERR(flowtable);
8188         }
8189
8190         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8191
8192         if (nla[NFTA_FLOWTABLE_HOOK])
8193                 return nft_delflowtable_hook(&ctx, flowtable, extack);
8194
8195         if (flowtable->use > 0) {
8196                 NL_SET_BAD_ATTR(extack, attr);
8197                 return -EBUSY;
8198         }
8199
8200         return nft_delflowtable(&ctx, flowtable);
8201 }
8202
8203 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8204                                          u32 portid, u32 seq, int event,
8205                                          u32 flags, int family,
8206                                          struct nft_flowtable *flowtable,
8207                                          struct list_head *hook_list)
8208 {
8209         struct nlattr *nest, *nest_devs;
8210         struct nft_hook *hook;
8211         struct nlmsghdr *nlh;
8212
8213         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8214         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8215                            NFNETLINK_V0, nft_base_seq(net));
8216         if (!nlh)
8217                 goto nla_put_failure;
8218
8219         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8220             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8221             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8222                          NFTA_FLOWTABLE_PAD))
8223                 goto nla_put_failure;
8224
8225         if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8226                 nlmsg_end(skb, nlh);
8227                 return 0;
8228         }
8229
8230         if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8231             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8232                 goto nla_put_failure;
8233
8234         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8235         if (!nest)
8236                 goto nla_put_failure;
8237         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8238             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8239                 goto nla_put_failure;
8240
8241         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8242         if (!nest_devs)
8243                 goto nla_put_failure;
8244
8245         if (!hook_list)
8246                 hook_list = &flowtable->hook_list;
8247
8248         list_for_each_entry_rcu(hook, hook_list, list) {
8249                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8250                         goto nla_put_failure;
8251         }
8252         nla_nest_end(skb, nest_devs);
8253         nla_nest_end(skb, nest);
8254
8255         nlmsg_end(skb, nlh);
8256         return 0;
8257
8258 nla_put_failure:
8259         nlmsg_trim(skb, nlh);
8260         return -1;
8261 }
8262
8263 struct nft_flowtable_filter {
8264         char            *table;
8265 };
8266
8267 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8268                                     struct netlink_callback *cb)
8269 {
8270         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8271         struct nft_flowtable_filter *filter = cb->data;
8272         unsigned int idx = 0, s_idx = cb->args[0];
8273         struct net *net = sock_net(skb->sk);
8274         int family = nfmsg->nfgen_family;
8275         struct nft_flowtable *flowtable;
8276         struct nftables_pernet *nft_net;
8277         const struct nft_table *table;
8278
8279         rcu_read_lock();
8280         nft_net = nft_pernet(net);
8281         cb->seq = READ_ONCE(nft_net->base_seq);
8282
8283         list_for_each_entry_rcu(table, &nft_net->tables, list) {
8284                 if (family != NFPROTO_UNSPEC && family != table->family)
8285                         continue;
8286
8287                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8288                         if (!nft_is_active(net, flowtable))
8289                                 goto cont;
8290                         if (idx < s_idx)
8291                                 goto cont;
8292                         if (idx > s_idx)
8293                                 memset(&cb->args[1], 0,
8294                                        sizeof(cb->args) - sizeof(cb->args[0]));
8295                         if (filter && filter->table &&
8296                             strcmp(filter->table, table->name))
8297                                 goto cont;
8298
8299                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8300                                                           cb->nlh->nlmsg_seq,
8301                                                           NFT_MSG_NEWFLOWTABLE,
8302                                                           NLM_F_MULTI | NLM_F_APPEND,
8303                                                           table->family,
8304                                                           flowtable, NULL) < 0)
8305                                 goto done;
8306
8307                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8308 cont:
8309                         idx++;
8310                 }
8311         }
8312 done:
8313         rcu_read_unlock();
8314
8315         cb->args[0] = idx;
8316         return skb->len;
8317 }
8318
8319 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8320 {
8321         const struct nlattr * const *nla = cb->data;
8322         struct nft_flowtable_filter *filter = NULL;
8323
8324         if (nla[NFTA_FLOWTABLE_TABLE]) {
8325                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8326                 if (!filter)
8327                         return -ENOMEM;
8328
8329                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8330                                            GFP_ATOMIC);
8331                 if (!filter->table) {
8332                         kfree(filter);
8333                         return -ENOMEM;
8334                 }
8335         }
8336
8337         cb->data = filter;
8338         return 0;
8339 }
8340
8341 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8342 {
8343         struct nft_flowtable_filter *filter = cb->data;
8344
8345         if (!filter)
8346                 return 0;
8347
8348         kfree(filter->table);
8349         kfree(filter);
8350
8351         return 0;
8352 }
8353
8354 /* called with rcu_read_lock held */
8355 static int nf_tables_getflowtable(struct sk_buff *skb,
8356                                   const struct nfnl_info *info,
8357                                   const struct nlattr * const nla[])
8358 {
8359         u8 genmask = nft_genmask_cur(info->net);
8360         u8 family = info->nfmsg->nfgen_family;
8361         struct nft_flowtable *flowtable;
8362         const struct nft_table *table;
8363         struct net *net = info->net;
8364         struct sk_buff *skb2;
8365         int err;
8366
8367         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8368                 struct netlink_dump_control c = {
8369                         .start = nf_tables_dump_flowtable_start,
8370                         .dump = nf_tables_dump_flowtable,
8371                         .done = nf_tables_dump_flowtable_done,
8372                         .module = THIS_MODULE,
8373                         .data = (void *)nla,
8374                 };
8375
8376                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8377         }
8378
8379         if (!nla[NFTA_FLOWTABLE_NAME])
8380                 return -EINVAL;
8381
8382         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8383                                  genmask, 0);
8384         if (IS_ERR(table))
8385                 return PTR_ERR(table);
8386
8387         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8388                                          genmask);
8389         if (IS_ERR(flowtable))
8390                 return PTR_ERR(flowtable);
8391
8392         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8393         if (!skb2)
8394                 return -ENOMEM;
8395
8396         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8397                                             info->nlh->nlmsg_seq,
8398                                             NFT_MSG_NEWFLOWTABLE, 0, family,
8399                                             flowtable, NULL);
8400         if (err < 0)
8401                 goto err_fill_flowtable_info;
8402
8403         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8404
8405 err_fill_flowtable_info:
8406         kfree_skb(skb2);
8407         return err;
8408 }
8409
8410 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8411                                        struct nft_flowtable *flowtable,
8412                                        struct list_head *hook_list, int event)
8413 {
8414         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8415         struct sk_buff *skb;
8416         u16 flags = 0;
8417         int err;
8418
8419         if (!ctx->report &&
8420             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8421                 return;
8422
8423         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8424         if (skb == NULL)
8425                 goto err;
8426
8427         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8428                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8429
8430         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8431                                             ctx->seq, event, flags,
8432                                             ctx->family, flowtable, hook_list);
8433         if (err < 0) {
8434                 kfree_skb(skb);
8435                 goto err;
8436         }
8437
8438         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8439         return;
8440 err:
8441         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8442 }
8443
8444 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8445 {
8446         struct nft_hook *hook, *next;
8447
8448         flowtable->data.type->free(&flowtable->data);
8449         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8450                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8451                                             FLOW_BLOCK_UNBIND);
8452                 list_del_rcu(&hook->list);
8453                 kfree(hook);
8454         }
8455         kfree(flowtable->name);
8456         module_put(flowtable->data.type->owner);
8457         kfree(flowtable);
8458 }
8459
8460 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8461                                    u32 portid, u32 seq)
8462 {
8463         struct nftables_pernet *nft_net = nft_pernet(net);
8464         struct nlmsghdr *nlh;
8465         char buf[TASK_COMM_LEN];
8466         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8467
8468         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8469                            NFNETLINK_V0, nft_base_seq(net));
8470         if (!nlh)
8471                 goto nla_put_failure;
8472
8473         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8474             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8475             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8476                 goto nla_put_failure;
8477
8478         nlmsg_end(skb, nlh);
8479         return 0;
8480
8481 nla_put_failure:
8482         nlmsg_trim(skb, nlh);
8483         return -EMSGSIZE;
8484 }
8485
8486 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8487                                 struct nft_flowtable *flowtable)
8488 {
8489         struct nft_hook *hook;
8490
8491         list_for_each_entry(hook, &flowtable->hook_list, list) {
8492                 if (hook->ops.dev != dev)
8493                         continue;
8494
8495                 /* flow_offload_netdev_event() cleans up entries for us. */
8496                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8497                 list_del_rcu(&hook->list);
8498                 kfree_rcu(hook, rcu);
8499                 break;
8500         }
8501 }
8502
8503 static int nf_tables_flowtable_event(struct notifier_block *this,
8504                                      unsigned long event, void *ptr)
8505 {
8506         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8507         struct nft_flowtable *flowtable;
8508         struct nftables_pernet *nft_net;
8509         struct nft_table *table;
8510         struct net *net;
8511
8512         if (event != NETDEV_UNREGISTER)
8513                 return 0;
8514
8515         net = dev_net(dev);
8516         nft_net = nft_pernet(net);
8517         mutex_lock(&nft_net->commit_mutex);
8518         list_for_each_entry(table, &nft_net->tables, list) {
8519                 list_for_each_entry(flowtable, &table->flowtables, list) {
8520                         nft_flowtable_event(event, dev, flowtable);
8521                 }
8522         }
8523         mutex_unlock(&nft_net->commit_mutex);
8524
8525         return NOTIFY_DONE;
8526 }
8527
8528 static struct notifier_block nf_tables_flowtable_notifier = {
8529         .notifier_call  = nf_tables_flowtable_event,
8530 };
8531
8532 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8533                                  int event)
8534 {
8535         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8536         struct sk_buff *skb2;
8537         int err;
8538
8539         if (!nlmsg_report(nlh) &&
8540             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8541                 return;
8542
8543         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8544         if (skb2 == NULL)
8545                 goto err;
8546
8547         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8548                                       nlh->nlmsg_seq);
8549         if (err < 0) {
8550                 kfree_skb(skb2);
8551                 goto err;
8552         }
8553
8554         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8555                        nlmsg_report(nlh), GFP_KERNEL);
8556         return;
8557 err:
8558         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8559                           -ENOBUFS);
8560 }
8561
8562 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8563                             const struct nlattr * const nla[])
8564 {
8565         struct sk_buff *skb2;
8566         int err;
8567
8568         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8569         if (skb2 == NULL)
8570                 return -ENOMEM;
8571
8572         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8573                                       info->nlh->nlmsg_seq);
8574         if (err < 0)
8575                 goto err_fill_gen_info;
8576
8577         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8578
8579 err_fill_gen_info:
8580         kfree_skb(skb2);
8581         return err;
8582 }
8583
8584 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8585         [NFT_MSG_NEWTABLE] = {
8586                 .call           = nf_tables_newtable,
8587                 .type           = NFNL_CB_BATCH,
8588                 .attr_count     = NFTA_TABLE_MAX,
8589                 .policy         = nft_table_policy,
8590         },
8591         [NFT_MSG_GETTABLE] = {
8592                 .call           = nf_tables_gettable,
8593                 .type           = NFNL_CB_RCU,
8594                 .attr_count     = NFTA_TABLE_MAX,
8595                 .policy         = nft_table_policy,
8596         },
8597         [NFT_MSG_DELTABLE] = {
8598                 .call           = nf_tables_deltable,
8599                 .type           = NFNL_CB_BATCH,
8600                 .attr_count     = NFTA_TABLE_MAX,
8601                 .policy         = nft_table_policy,
8602         },
8603         [NFT_MSG_DESTROYTABLE] = {
8604                 .call           = nf_tables_deltable,
8605                 .type           = NFNL_CB_BATCH,
8606                 .attr_count     = NFTA_TABLE_MAX,
8607                 .policy         = nft_table_policy,
8608         },
8609         [NFT_MSG_NEWCHAIN] = {
8610                 .call           = nf_tables_newchain,
8611                 .type           = NFNL_CB_BATCH,
8612                 .attr_count     = NFTA_CHAIN_MAX,
8613                 .policy         = nft_chain_policy,
8614         },
8615         [NFT_MSG_GETCHAIN] = {
8616                 .call           = nf_tables_getchain,
8617                 .type           = NFNL_CB_RCU,
8618                 .attr_count     = NFTA_CHAIN_MAX,
8619                 .policy         = nft_chain_policy,
8620         },
8621         [NFT_MSG_DELCHAIN] = {
8622                 .call           = nf_tables_delchain,
8623                 .type           = NFNL_CB_BATCH,
8624                 .attr_count     = NFTA_CHAIN_MAX,
8625                 .policy         = nft_chain_policy,
8626         },
8627         [NFT_MSG_DESTROYCHAIN] = {
8628                 .call           = nf_tables_delchain,
8629                 .type           = NFNL_CB_BATCH,
8630                 .attr_count     = NFTA_CHAIN_MAX,
8631                 .policy         = nft_chain_policy,
8632         },
8633         [NFT_MSG_NEWRULE] = {
8634                 .call           = nf_tables_newrule,
8635                 .type           = NFNL_CB_BATCH,
8636                 .attr_count     = NFTA_RULE_MAX,
8637                 .policy         = nft_rule_policy,
8638         },
8639         [NFT_MSG_GETRULE] = {
8640                 .call           = nf_tables_getrule,
8641                 .type           = NFNL_CB_RCU,
8642                 .attr_count     = NFTA_RULE_MAX,
8643                 .policy         = nft_rule_policy,
8644         },
8645         [NFT_MSG_GETRULE_RESET] = {
8646                 .call           = nf_tables_getrule,
8647                 .type           = NFNL_CB_RCU,
8648                 .attr_count     = NFTA_RULE_MAX,
8649                 .policy         = nft_rule_policy,
8650         },
8651         [NFT_MSG_DELRULE] = {
8652                 .call           = nf_tables_delrule,
8653                 .type           = NFNL_CB_BATCH,
8654                 .attr_count     = NFTA_RULE_MAX,
8655                 .policy         = nft_rule_policy,
8656         },
8657         [NFT_MSG_DESTROYRULE] = {
8658                 .call           = nf_tables_delrule,
8659                 .type           = NFNL_CB_BATCH,
8660                 .attr_count     = NFTA_RULE_MAX,
8661                 .policy         = nft_rule_policy,
8662         },
8663         [NFT_MSG_NEWSET] = {
8664                 .call           = nf_tables_newset,
8665                 .type           = NFNL_CB_BATCH,
8666                 .attr_count     = NFTA_SET_MAX,
8667                 .policy         = nft_set_policy,
8668         },
8669         [NFT_MSG_GETSET] = {
8670                 .call           = nf_tables_getset,
8671                 .type           = NFNL_CB_RCU,
8672                 .attr_count     = NFTA_SET_MAX,
8673                 .policy         = nft_set_policy,
8674         },
8675         [NFT_MSG_DELSET] = {
8676                 .call           = nf_tables_delset,
8677                 .type           = NFNL_CB_BATCH,
8678                 .attr_count     = NFTA_SET_MAX,
8679                 .policy         = nft_set_policy,
8680         },
8681         [NFT_MSG_DESTROYSET] = {
8682                 .call           = nf_tables_delset,
8683                 .type           = NFNL_CB_BATCH,
8684                 .attr_count     = NFTA_SET_MAX,
8685                 .policy         = nft_set_policy,
8686         },
8687         [NFT_MSG_NEWSETELEM] = {
8688                 .call           = nf_tables_newsetelem,
8689                 .type           = NFNL_CB_BATCH,
8690                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8691                 .policy         = nft_set_elem_list_policy,
8692         },
8693         [NFT_MSG_GETSETELEM] = {
8694                 .call           = nf_tables_getsetelem,
8695                 .type           = NFNL_CB_RCU,
8696                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8697                 .policy         = nft_set_elem_list_policy,
8698         },
8699         [NFT_MSG_DELSETELEM] = {
8700                 .call           = nf_tables_delsetelem,
8701                 .type           = NFNL_CB_BATCH,
8702                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8703                 .policy         = nft_set_elem_list_policy,
8704         },
8705         [NFT_MSG_DESTROYSETELEM] = {
8706                 .call           = nf_tables_delsetelem,
8707                 .type           = NFNL_CB_BATCH,
8708                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8709                 .policy         = nft_set_elem_list_policy,
8710         },
8711         [NFT_MSG_GETGEN] = {
8712                 .call           = nf_tables_getgen,
8713                 .type           = NFNL_CB_RCU,
8714         },
8715         [NFT_MSG_NEWOBJ] = {
8716                 .call           = nf_tables_newobj,
8717                 .type           = NFNL_CB_BATCH,
8718                 .attr_count     = NFTA_OBJ_MAX,
8719                 .policy         = nft_obj_policy,
8720         },
8721         [NFT_MSG_GETOBJ] = {
8722                 .call           = nf_tables_getobj,
8723                 .type           = NFNL_CB_RCU,
8724                 .attr_count     = NFTA_OBJ_MAX,
8725                 .policy         = nft_obj_policy,
8726         },
8727         [NFT_MSG_DELOBJ] = {
8728                 .call           = nf_tables_delobj,
8729                 .type           = NFNL_CB_BATCH,
8730                 .attr_count     = NFTA_OBJ_MAX,
8731                 .policy         = nft_obj_policy,
8732         },
8733         [NFT_MSG_DESTROYOBJ] = {
8734                 .call           = nf_tables_delobj,
8735                 .type           = NFNL_CB_BATCH,
8736                 .attr_count     = NFTA_OBJ_MAX,
8737                 .policy         = nft_obj_policy,
8738         },
8739         [NFT_MSG_GETOBJ_RESET] = {
8740                 .call           = nf_tables_getobj,
8741                 .type           = NFNL_CB_RCU,
8742                 .attr_count     = NFTA_OBJ_MAX,
8743                 .policy         = nft_obj_policy,
8744         },
8745         [NFT_MSG_NEWFLOWTABLE] = {
8746                 .call           = nf_tables_newflowtable,
8747                 .type           = NFNL_CB_BATCH,
8748                 .attr_count     = NFTA_FLOWTABLE_MAX,
8749                 .policy         = nft_flowtable_policy,
8750         },
8751         [NFT_MSG_GETFLOWTABLE] = {
8752                 .call           = nf_tables_getflowtable,
8753                 .type           = NFNL_CB_RCU,
8754                 .attr_count     = NFTA_FLOWTABLE_MAX,
8755                 .policy         = nft_flowtable_policy,
8756         },
8757         [NFT_MSG_DELFLOWTABLE] = {
8758                 .call           = nf_tables_delflowtable,
8759                 .type           = NFNL_CB_BATCH,
8760                 .attr_count     = NFTA_FLOWTABLE_MAX,
8761                 .policy         = nft_flowtable_policy,
8762         },
8763         [NFT_MSG_DESTROYFLOWTABLE] = {
8764                 .call           = nf_tables_delflowtable,
8765                 .type           = NFNL_CB_BATCH,
8766                 .attr_count     = NFTA_FLOWTABLE_MAX,
8767                 .policy         = nft_flowtable_policy,
8768         },
8769 };
8770
8771 static int nf_tables_validate(struct net *net)
8772 {
8773         struct nftables_pernet *nft_net = nft_pernet(net);
8774         struct nft_table *table;
8775
8776         list_for_each_entry(table, &nft_net->tables, list) {
8777                 switch (table->validate_state) {
8778                 case NFT_VALIDATE_SKIP:
8779                         continue;
8780                 case NFT_VALIDATE_NEED:
8781                         nft_validate_state_update(table, NFT_VALIDATE_DO);
8782                         fallthrough;
8783                 case NFT_VALIDATE_DO:
8784                         if (nft_table_validate(net, table) < 0)
8785                                 return -EAGAIN;
8786
8787                         nft_validate_state_update(table, NFT_VALIDATE_SKIP);
8788                 }
8789
8790                 break;
8791         }
8792
8793         return 0;
8794 }
8795
8796 /* a drop policy has to be deferred until all rules have been activated,
8797  * otherwise a large ruleset that contains a drop-policy base chain will
8798  * cause all packets to get dropped until the full transaction has been
8799  * processed.
8800  *
8801  * We defer the drop policy until the transaction has been finalized.
8802  */
8803 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8804 {
8805         struct nft_base_chain *basechain;
8806
8807         if (nft_trans_chain_policy(trans) != NF_DROP)
8808                 return;
8809
8810         if (!nft_is_base_chain(trans->ctx.chain))
8811                 return;
8812
8813         basechain = nft_base_chain(trans->ctx.chain);
8814         basechain->policy = NF_DROP;
8815 }
8816
8817 static void nft_chain_commit_update(struct nft_trans *trans)
8818 {
8819         struct nft_base_chain *basechain;
8820
8821         if (nft_trans_chain_name(trans)) {
8822                 rhltable_remove(&trans->ctx.table->chains_ht,
8823                                 &trans->ctx.chain->rhlhead,
8824                                 nft_chain_ht_params);
8825                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8826                 rhltable_insert_key(&trans->ctx.table->chains_ht,
8827                                     trans->ctx.chain->name,
8828                                     &trans->ctx.chain->rhlhead,
8829                                     nft_chain_ht_params);
8830         }
8831
8832         if (!nft_is_base_chain(trans->ctx.chain))
8833                 return;
8834
8835         nft_chain_stats_replace(trans);
8836
8837         basechain = nft_base_chain(trans->ctx.chain);
8838
8839         switch (nft_trans_chain_policy(trans)) {
8840         case NF_DROP:
8841         case NF_ACCEPT:
8842                 basechain->policy = nft_trans_chain_policy(trans);
8843                 break;
8844         }
8845 }
8846
8847 static void nft_obj_commit_update(struct nft_trans *trans)
8848 {
8849         struct nft_object *newobj;
8850         struct nft_object *obj;
8851
8852         obj = nft_trans_obj(trans);
8853         newobj = nft_trans_obj_newobj(trans);
8854
8855         if (obj->ops->update)
8856                 obj->ops->update(obj, newobj);
8857
8858         nft_obj_destroy(&trans->ctx, newobj);
8859 }
8860
8861 static void nft_commit_release(struct nft_trans *trans)
8862 {
8863         switch (trans->msg_type) {
8864         case NFT_MSG_DELTABLE:
8865         case NFT_MSG_DESTROYTABLE:
8866                 nf_tables_table_destroy(&trans->ctx);
8867                 break;
8868         case NFT_MSG_NEWCHAIN:
8869                 free_percpu(nft_trans_chain_stats(trans));
8870                 kfree(nft_trans_chain_name(trans));
8871                 break;
8872         case NFT_MSG_DELCHAIN:
8873         case NFT_MSG_DESTROYCHAIN:
8874                 if (nft_trans_chain_update(trans))
8875                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
8876                 else
8877                         nf_tables_chain_destroy(&trans->ctx);
8878                 break;
8879         case NFT_MSG_DELRULE:
8880         case NFT_MSG_DESTROYRULE:
8881                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8882                 break;
8883         case NFT_MSG_DELSET:
8884         case NFT_MSG_DESTROYSET:
8885                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8886                 break;
8887         case NFT_MSG_DELSETELEM:
8888         case NFT_MSG_DESTROYSETELEM:
8889                 nf_tables_set_elem_destroy(&trans->ctx,
8890                                            nft_trans_elem_set(trans),
8891                                            nft_trans_elem(trans).priv);
8892                 break;
8893         case NFT_MSG_DELOBJ:
8894         case NFT_MSG_DESTROYOBJ:
8895                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8896                 break;
8897         case NFT_MSG_DELFLOWTABLE:
8898         case NFT_MSG_DESTROYFLOWTABLE:
8899                 if (nft_trans_flowtable_update(trans))
8900                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8901                 else
8902                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8903                 break;
8904         }
8905
8906         if (trans->put_net)
8907                 put_net(trans->ctx.net);
8908
8909         kfree(trans);
8910 }
8911
8912 static void nf_tables_trans_destroy_work(struct work_struct *w)
8913 {
8914         struct nft_trans *trans, *next;
8915         LIST_HEAD(head);
8916
8917         spin_lock(&nf_tables_destroy_list_lock);
8918         list_splice_init(&nf_tables_destroy_list, &head);
8919         spin_unlock(&nf_tables_destroy_list_lock);
8920
8921         if (list_empty(&head))
8922                 return;
8923
8924         synchronize_rcu();
8925
8926         list_for_each_entry_safe(trans, next, &head, list) {
8927                 list_del(&trans->list);
8928                 nft_commit_release(trans);
8929         }
8930 }
8931
8932 void nf_tables_trans_destroy_flush_work(void)
8933 {
8934         flush_work(&trans_destroy_work);
8935 }
8936 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8937
8938 static bool nft_expr_reduce(struct nft_regs_track *track,
8939                             const struct nft_expr *expr)
8940 {
8941         return false;
8942 }
8943
8944 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8945 {
8946         const struct nft_expr *expr, *last;
8947         struct nft_regs_track track = {};
8948         unsigned int size, data_size;
8949         void *data, *data_boundary;
8950         struct nft_rule_dp *prule;
8951         struct nft_rule *rule;
8952
8953         /* already handled or inactive chain? */
8954         if (chain->blob_next || !nft_is_active_next(net, chain))
8955                 return 0;
8956
8957         data_size = 0;
8958         list_for_each_entry(rule, &chain->rules, list) {
8959                 if (nft_is_active_next(net, rule)) {
8960                         data_size += sizeof(*prule) + rule->dlen;
8961                         if (data_size > INT_MAX)
8962                                 return -ENOMEM;
8963                 }
8964         }
8965
8966         chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
8967         if (!chain->blob_next)
8968                 return -ENOMEM;
8969
8970         data = (void *)chain->blob_next->data;
8971         data_boundary = data + data_size;
8972         size = 0;
8973
8974         list_for_each_entry(rule, &chain->rules, list) {
8975                 if (!nft_is_active_next(net, rule))
8976                         continue;
8977
8978                 prule = (struct nft_rule_dp *)data;
8979                 data += offsetof(struct nft_rule_dp, data);
8980                 if (WARN_ON_ONCE(data > data_boundary))
8981                         return -ENOMEM;
8982
8983                 size = 0;
8984                 track.last = nft_expr_last(rule);
8985                 nft_rule_for_each_expr(expr, last, rule) {
8986                         track.cur = expr;
8987
8988                         if (nft_expr_reduce(&track, expr)) {
8989                                 expr = track.cur;
8990                                 continue;
8991                         }
8992
8993                         if (WARN_ON_ONCE(data + expr->ops->size > data_boundary))
8994                                 return -ENOMEM;
8995
8996                         memcpy(data + size, expr, expr->ops->size);
8997                         size += expr->ops->size;
8998                 }
8999                 if (WARN_ON_ONCE(size >= 1 << 12))
9000                         return -ENOMEM;
9001
9002                 prule->handle = rule->handle;
9003                 prule->dlen = size;
9004                 prule->is_last = 0;
9005
9006                 data += size;
9007                 size = 0;
9008                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9009         }
9010
9011         if (WARN_ON_ONCE(data > data_boundary))
9012                 return -ENOMEM;
9013
9014         prule = (struct nft_rule_dp *)data;
9015         nft_last_rule(chain, prule);
9016
9017         return 0;
9018 }
9019
9020 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9021 {
9022         struct nftables_pernet *nft_net = nft_pernet(net);
9023         struct nft_trans *trans, *next;
9024
9025         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9026                 struct nft_chain *chain = trans->ctx.chain;
9027
9028                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9029                     trans->msg_type == NFT_MSG_DELRULE) {
9030                         kvfree(chain->blob_next);
9031                         chain->blob_next = NULL;
9032                 }
9033         }
9034 }
9035
9036 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9037 {
9038         struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9039
9040         kvfree(l->blob);
9041 }
9042
9043 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9044 {
9045         struct nft_rule_dp_last *last;
9046
9047         /* last rule trailer is after end marker */
9048         last = (void *)blob + sizeof(*blob) + blob->size;
9049         last->blob = blob;
9050
9051         call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9052 }
9053
9054 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9055 {
9056         struct nft_rule_blob *g0, *g1;
9057         bool next_genbit;
9058
9059         next_genbit = nft_gencursor_next(net);
9060
9061         g0 = rcu_dereference_protected(chain->blob_gen_0,
9062                                        lockdep_commit_lock_is_held(net));
9063         g1 = rcu_dereference_protected(chain->blob_gen_1,
9064                                        lockdep_commit_lock_is_held(net));
9065
9066         /* No changes to this chain? */
9067         if (chain->blob_next == NULL) {
9068                 /* chain had no change in last or next generation */
9069                 if (g0 == g1)
9070                         return;
9071                 /*
9072                  * chain had no change in this generation; make sure next
9073                  * one uses same rules as current generation.
9074                  */
9075                 if (next_genbit) {
9076                         rcu_assign_pointer(chain->blob_gen_1, g0);
9077                         nf_tables_commit_chain_free_rules_old(g1);
9078                 } else {
9079                         rcu_assign_pointer(chain->blob_gen_0, g1);
9080                         nf_tables_commit_chain_free_rules_old(g0);
9081                 }
9082
9083                 return;
9084         }
9085
9086         if (next_genbit)
9087                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9088         else
9089                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9090
9091         chain->blob_next = NULL;
9092
9093         if (g0 == g1)
9094                 return;
9095
9096         if (next_genbit)
9097                 nf_tables_commit_chain_free_rules_old(g1);
9098         else
9099                 nf_tables_commit_chain_free_rules_old(g0);
9100 }
9101
9102 static void nft_obj_del(struct nft_object *obj)
9103 {
9104         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9105         list_del_rcu(&obj->list);
9106 }
9107
9108 void nft_chain_del(struct nft_chain *chain)
9109 {
9110         struct nft_table *table = chain->table;
9111
9112         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9113                                      nft_chain_ht_params));
9114         list_del_rcu(&chain->list);
9115 }
9116
9117 static void nf_tables_module_autoload_cleanup(struct net *net)
9118 {
9119         struct nftables_pernet *nft_net = nft_pernet(net);
9120         struct nft_module_request *req, *next;
9121
9122         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9123         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9124                 WARN_ON_ONCE(!req->done);
9125                 list_del(&req->list);
9126                 kfree(req);
9127         }
9128 }
9129
9130 static void nf_tables_commit_release(struct net *net)
9131 {
9132         struct nftables_pernet *nft_net = nft_pernet(net);
9133         struct nft_trans *trans;
9134
9135         /* all side effects have to be made visible.
9136          * For example, if a chain named 'foo' has been deleted, a
9137          * new transaction must not find it anymore.
9138          *
9139          * Memory reclaim happens asynchronously from work queue
9140          * to prevent expensive synchronize_rcu() in commit phase.
9141          */
9142         if (list_empty(&nft_net->commit_list)) {
9143                 nf_tables_module_autoload_cleanup(net);
9144                 mutex_unlock(&nft_net->commit_mutex);
9145                 return;
9146         }
9147
9148         trans = list_last_entry(&nft_net->commit_list,
9149                                 struct nft_trans, list);
9150         get_net(trans->ctx.net);
9151         WARN_ON_ONCE(trans->put_net);
9152
9153         trans->put_net = true;
9154         spin_lock(&nf_tables_destroy_list_lock);
9155         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9156         spin_unlock(&nf_tables_destroy_list_lock);
9157
9158         nf_tables_module_autoload_cleanup(net);
9159         schedule_work(&trans_destroy_work);
9160
9161         mutex_unlock(&nft_net->commit_mutex);
9162 }
9163
9164 static void nft_commit_notify(struct net *net, u32 portid)
9165 {
9166         struct nftables_pernet *nft_net = nft_pernet(net);
9167         struct sk_buff *batch_skb = NULL, *nskb, *skb;
9168         unsigned char *data;
9169         int len;
9170
9171         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9172                 if (!batch_skb) {
9173 new_batch:
9174                         batch_skb = skb;
9175                         len = NLMSG_GOODSIZE - skb->len;
9176                         list_del(&skb->list);
9177                         continue;
9178                 }
9179                 len -= skb->len;
9180                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9181                         data = skb_put(batch_skb, skb->len);
9182                         memcpy(data, skb->data, skb->len);
9183                         list_del(&skb->list);
9184                         kfree_skb(skb);
9185                         continue;
9186                 }
9187                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9188                                NFT_CB(batch_skb).report, GFP_KERNEL);
9189                 goto new_batch;
9190         }
9191
9192         if (batch_skb) {
9193                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9194                                NFT_CB(batch_skb).report, GFP_KERNEL);
9195         }
9196
9197         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9198 }
9199
9200 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9201                                         struct nft_table *table)
9202 {
9203         struct nft_audit_data *adp;
9204
9205         list_for_each_entry(adp, adl, list) {
9206                 if (adp->table == table)
9207                         return 0;
9208         }
9209         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9210         if (!adp)
9211                 return -ENOMEM;
9212         adp->table = table;
9213         list_add(&adp->list, adl);
9214         return 0;
9215 }
9216
9217 static void nf_tables_commit_audit_free(struct list_head *adl)
9218 {
9219         struct nft_audit_data *adp, *adn;
9220
9221         list_for_each_entry_safe(adp, adn, adl, list) {
9222                 list_del(&adp->list);
9223                 kfree(adp);
9224         }
9225 }
9226
9227 static void nf_tables_commit_audit_collect(struct list_head *adl,
9228                                            struct nft_table *table, u32 op)
9229 {
9230         struct nft_audit_data *adp;
9231
9232         list_for_each_entry(adp, adl, list) {
9233                 if (adp->table == table)
9234                         goto found;
9235         }
9236         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9237         return;
9238 found:
9239         adp->entries++;
9240         if (!adp->op || adp->op > op)
9241                 adp->op = op;
9242 }
9243
9244 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9245
9246 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9247 {
9248         struct nft_audit_data *adp, *adn;
9249         char aubuf[AUNFTABLENAMELEN];
9250
9251         list_for_each_entry_safe(adp, adn, adl, list) {
9252                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9253                          generation);
9254                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9255                                 nft2audit_op[adp->op], GFP_KERNEL);
9256                 list_del(&adp->list);
9257                 kfree(adp);
9258         }
9259 }
9260
9261 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9262 {
9263         struct nftables_pernet *nft_net = nft_pernet(net);
9264         struct nft_trans *trans, *next;
9265         struct nft_trans_elem *te;
9266         struct nft_chain *chain;
9267         struct nft_table *table;
9268         unsigned int base_seq;
9269         LIST_HEAD(adl);
9270         int err;
9271
9272         if (list_empty(&nft_net->commit_list)) {
9273                 mutex_unlock(&nft_net->commit_mutex);
9274                 return 0;
9275         }
9276
9277         /* 0. Validate ruleset, otherwise roll back for error reporting. */
9278         if (nf_tables_validate(net) < 0)
9279                 return -EAGAIN;
9280
9281         err = nft_flow_rule_offload_commit(net);
9282         if (err < 0)
9283                 return err;
9284
9285         /* 1.  Allocate space for next generation rules_gen_X[] */
9286         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9287                 int ret;
9288
9289                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9290                 if (ret) {
9291                         nf_tables_commit_chain_prepare_cancel(net);
9292                         nf_tables_commit_audit_free(&adl);
9293                         return ret;
9294                 }
9295                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9296                     trans->msg_type == NFT_MSG_DELRULE) {
9297                         chain = trans->ctx.chain;
9298
9299                         ret = nf_tables_commit_chain_prepare(net, chain);
9300                         if (ret < 0) {
9301                                 nf_tables_commit_chain_prepare_cancel(net);
9302                                 nf_tables_commit_audit_free(&adl);
9303                                 return ret;
9304                         }
9305                 }
9306         }
9307
9308         /* step 2.  Make rules_gen_X visible to packet path */
9309         list_for_each_entry(table, &nft_net->tables, list) {
9310                 list_for_each_entry(chain, &table->chains, list)
9311                         nf_tables_commit_chain(net, chain);
9312         }
9313
9314         /*
9315          * Bump generation counter, invalidate any dump in progress.
9316          * Cannot fail after this point.
9317          */
9318         base_seq = READ_ONCE(nft_net->base_seq);
9319         while (++base_seq == 0)
9320                 ;
9321
9322         WRITE_ONCE(nft_net->base_seq, base_seq);
9323
9324         /* step 3. Start new generation, rules_gen_X now in use. */
9325         net->nft.gencursor = nft_gencursor_next(net);
9326
9327         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9328                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9329                                                trans->msg_type);
9330                 switch (trans->msg_type) {
9331                 case NFT_MSG_NEWTABLE:
9332                         if (nft_trans_table_update(trans)) {
9333                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9334                                         nft_trans_destroy(trans);
9335                                         break;
9336                                 }
9337                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9338                                         nf_tables_table_disable(net, trans->ctx.table);
9339
9340                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9341                         } else {
9342                                 nft_clear(net, trans->ctx.table);
9343                         }
9344                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
9345                         nft_trans_destroy(trans);
9346                         break;
9347                 case NFT_MSG_DELTABLE:
9348                 case NFT_MSG_DESTROYTABLE:
9349                         list_del_rcu(&trans->ctx.table->list);
9350                         nf_tables_table_notify(&trans->ctx, trans->msg_type);
9351                         break;
9352                 case NFT_MSG_NEWCHAIN:
9353                         if (nft_trans_chain_update(trans)) {
9354                                 nft_chain_commit_update(trans);
9355                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
9356                                                        &nft_trans_chain_hooks(trans));
9357                                 list_splice(&nft_trans_chain_hooks(trans),
9358                                             &nft_trans_basechain(trans)->hook_list);
9359                                 /* trans destroyed after rcu grace period */
9360                         } else {
9361                                 nft_chain_commit_drop_policy(trans);
9362                                 nft_clear(net, trans->ctx.chain);
9363                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
9364                                 nft_trans_destroy(trans);
9365                         }
9366                         break;
9367                 case NFT_MSG_DELCHAIN:
9368                 case NFT_MSG_DESTROYCHAIN:
9369                         if (nft_trans_chain_update(trans)) {
9370                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9371                                                        &nft_trans_chain_hooks(trans));
9372                                 nft_netdev_unregister_hooks(net,
9373                                                             &nft_trans_chain_hooks(trans),
9374                                                             true);
9375                         } else {
9376                                 nft_chain_del(trans->ctx.chain);
9377                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9378                                                        NULL);
9379                                 nf_tables_unregister_hook(trans->ctx.net,
9380                                                           trans->ctx.table,
9381                                                           trans->ctx.chain);
9382                         }
9383                         break;
9384                 case NFT_MSG_NEWRULE:
9385                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9386                         nf_tables_rule_notify(&trans->ctx,
9387                                               nft_trans_rule(trans),
9388                                               NFT_MSG_NEWRULE);
9389                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9390                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9391
9392                         nft_trans_destroy(trans);
9393                         break;
9394                 case NFT_MSG_DELRULE:
9395                 case NFT_MSG_DESTROYRULE:
9396                         list_del_rcu(&nft_trans_rule(trans)->list);
9397                         nf_tables_rule_notify(&trans->ctx,
9398                                               nft_trans_rule(trans),
9399                                               trans->msg_type);
9400                         nft_rule_expr_deactivate(&trans->ctx,
9401                                                  nft_trans_rule(trans),
9402                                                  NFT_TRANS_COMMIT);
9403
9404                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9405                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9406                         break;
9407                 case NFT_MSG_NEWSET:
9408                         if (nft_trans_set_update(trans)) {
9409                                 struct nft_set *set = nft_trans_set(trans);
9410
9411                                 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
9412                                 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
9413                         } else {
9414                                 nft_clear(net, nft_trans_set(trans));
9415                                 /* This avoids hitting -EBUSY when deleting the table
9416                                  * from the transaction.
9417                                  */
9418                                 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
9419                                     !list_empty(&nft_trans_set(trans)->bindings))
9420                                         trans->ctx.table->use--;
9421                         }
9422                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9423                                              NFT_MSG_NEWSET, GFP_KERNEL);
9424                         nft_trans_destroy(trans);
9425                         break;
9426                 case NFT_MSG_DELSET:
9427                 case NFT_MSG_DESTROYSET:
9428                         list_del_rcu(&nft_trans_set(trans)->list);
9429                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9430                                              trans->msg_type, GFP_KERNEL);
9431                         break;
9432                 case NFT_MSG_NEWSETELEM:
9433                         te = (struct nft_trans_elem *)trans->data;
9434
9435                         nft_setelem_activate(net, te->set, &te->elem);
9436                         nf_tables_setelem_notify(&trans->ctx, te->set,
9437                                                  &te->elem,
9438                                                  NFT_MSG_NEWSETELEM);
9439                         nft_trans_destroy(trans);
9440                         break;
9441                 case NFT_MSG_DELSETELEM:
9442                 case NFT_MSG_DESTROYSETELEM:
9443                         te = (struct nft_trans_elem *)trans->data;
9444
9445                         nf_tables_setelem_notify(&trans->ctx, te->set,
9446                                                  &te->elem,
9447                                                  trans->msg_type);
9448                         nft_setelem_remove(net, te->set, &te->elem);
9449                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
9450                                 atomic_dec(&te->set->nelems);
9451                                 te->set->ndeact--;
9452                         }
9453                         break;
9454                 case NFT_MSG_NEWOBJ:
9455                         if (nft_trans_obj_update(trans)) {
9456                                 nft_obj_commit_update(trans);
9457                                 nf_tables_obj_notify(&trans->ctx,
9458                                                      nft_trans_obj(trans),
9459                                                      NFT_MSG_NEWOBJ);
9460                         } else {
9461                                 nft_clear(net, nft_trans_obj(trans));
9462                                 nf_tables_obj_notify(&trans->ctx,
9463                                                      nft_trans_obj(trans),
9464                                                      NFT_MSG_NEWOBJ);
9465                                 nft_trans_destroy(trans);
9466                         }
9467                         break;
9468                 case NFT_MSG_DELOBJ:
9469                 case NFT_MSG_DESTROYOBJ:
9470                         nft_obj_del(nft_trans_obj(trans));
9471                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
9472                                              trans->msg_type);
9473                         break;
9474                 case NFT_MSG_NEWFLOWTABLE:
9475                         if (nft_trans_flowtable_update(trans)) {
9476                                 nft_trans_flowtable(trans)->data.flags =
9477                                         nft_trans_flowtable_flags(trans);
9478                                 nf_tables_flowtable_notify(&trans->ctx,
9479                                                            nft_trans_flowtable(trans),
9480                                                            &nft_trans_flowtable_hooks(trans),
9481                                                            NFT_MSG_NEWFLOWTABLE);
9482                                 list_splice(&nft_trans_flowtable_hooks(trans),
9483                                             &nft_trans_flowtable(trans)->hook_list);
9484                         } else {
9485                                 nft_clear(net, nft_trans_flowtable(trans));
9486                                 nf_tables_flowtable_notify(&trans->ctx,
9487                                                            nft_trans_flowtable(trans),
9488                                                            NULL,
9489                                                            NFT_MSG_NEWFLOWTABLE);
9490                         }
9491                         nft_trans_destroy(trans);
9492                         break;
9493                 case NFT_MSG_DELFLOWTABLE:
9494                 case NFT_MSG_DESTROYFLOWTABLE:
9495                         if (nft_trans_flowtable_update(trans)) {
9496                                 nf_tables_flowtable_notify(&trans->ctx,
9497                                                            nft_trans_flowtable(trans),
9498                                                            &nft_trans_flowtable_hooks(trans),
9499                                                            trans->msg_type);
9500                                 nft_unregister_flowtable_net_hooks(net,
9501                                                                    &nft_trans_flowtable_hooks(trans));
9502                         } else {
9503                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9504                                 nf_tables_flowtable_notify(&trans->ctx,
9505                                                            nft_trans_flowtable(trans),
9506                                                            NULL,
9507                                                            trans->msg_type);
9508                                 nft_unregister_flowtable_net_hooks(net,
9509                                                 &nft_trans_flowtable(trans)->hook_list);
9510                         }
9511                         break;
9512                 }
9513         }
9514
9515         nft_commit_notify(net, NETLINK_CB(skb).portid);
9516         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
9517         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
9518         nf_tables_commit_release(net);
9519
9520         return 0;
9521 }
9522
9523 static void nf_tables_module_autoload(struct net *net)
9524 {
9525         struct nftables_pernet *nft_net = nft_pernet(net);
9526         struct nft_module_request *req, *next;
9527         LIST_HEAD(module_list);
9528
9529         list_splice_init(&nft_net->module_list, &module_list);
9530         mutex_unlock(&nft_net->commit_mutex);
9531         list_for_each_entry_safe(req, next, &module_list, list) {
9532                 request_module("%s", req->module);
9533                 req->done = true;
9534         }
9535         mutex_lock(&nft_net->commit_mutex);
9536         list_splice(&module_list, &nft_net->module_list);
9537 }
9538
9539 static void nf_tables_abort_release(struct nft_trans *trans)
9540 {
9541         switch (trans->msg_type) {
9542         case NFT_MSG_NEWTABLE:
9543                 nf_tables_table_destroy(&trans->ctx);
9544                 break;
9545         case NFT_MSG_NEWCHAIN:
9546                 if (nft_trans_chain_update(trans))
9547                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9548                 else
9549                         nf_tables_chain_destroy(&trans->ctx);
9550                 break;
9551         case NFT_MSG_NEWRULE:
9552                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9553                 break;
9554         case NFT_MSG_NEWSET:
9555                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9556                 break;
9557         case NFT_MSG_NEWSETELEM:
9558                 nft_set_elem_destroy(nft_trans_elem_set(trans),
9559                                      nft_trans_elem(trans).priv, true);
9560                 break;
9561         case NFT_MSG_NEWOBJ:
9562                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9563                 break;
9564         case NFT_MSG_NEWFLOWTABLE:
9565                 if (nft_trans_flowtable_update(trans))
9566                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9567                 else
9568                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9569                 break;
9570         }
9571         kfree(trans);
9572 }
9573
9574 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9575 {
9576         struct nftables_pernet *nft_net = nft_pernet(net);
9577         struct nft_trans *trans, *next;
9578         struct nft_trans_elem *te;
9579
9580         if (action == NFNL_ABORT_VALIDATE &&
9581             nf_tables_validate(net) < 0)
9582                 return -EAGAIN;
9583
9584         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9585                                          list) {
9586                 switch (trans->msg_type) {
9587                 case NFT_MSG_NEWTABLE:
9588                         if (nft_trans_table_update(trans)) {
9589                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9590                                         nft_trans_destroy(trans);
9591                                         break;
9592                                 }
9593                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9594                                         nf_tables_table_disable(net, trans->ctx.table);
9595                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9596                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9597                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9598                                 }
9599                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9600                                 nft_trans_destroy(trans);
9601                         } else {
9602                                 list_del_rcu(&trans->ctx.table->list);
9603                         }
9604                         break;
9605                 case NFT_MSG_DELTABLE:
9606                 case NFT_MSG_DESTROYTABLE:
9607                         nft_clear(trans->ctx.net, trans->ctx.table);
9608                         nft_trans_destroy(trans);
9609                         break;
9610                 case NFT_MSG_NEWCHAIN:
9611                         if (nft_trans_chain_update(trans)) {
9612                                 nft_netdev_unregister_hooks(net,
9613                                                             &nft_trans_chain_hooks(trans),
9614                                                             true);
9615                                 free_percpu(nft_trans_chain_stats(trans));
9616                                 kfree(nft_trans_chain_name(trans));
9617                                 nft_trans_destroy(trans);
9618                         } else {
9619                                 if (nft_chain_is_bound(trans->ctx.chain)) {
9620                                         nft_trans_destroy(trans);
9621                                         break;
9622                                 }
9623                                 trans->ctx.table->use--;
9624                                 nft_chain_del(trans->ctx.chain);
9625                                 nf_tables_unregister_hook(trans->ctx.net,
9626                                                           trans->ctx.table,
9627                                                           trans->ctx.chain);
9628                         }
9629                         break;
9630                 case NFT_MSG_DELCHAIN:
9631                 case NFT_MSG_DESTROYCHAIN:
9632                         if (nft_trans_chain_update(trans)) {
9633                                 list_splice(&nft_trans_chain_hooks(trans),
9634                                             &nft_trans_basechain(trans)->hook_list);
9635                         } else {
9636                                 trans->ctx.table->use++;
9637                                 nft_clear(trans->ctx.net, trans->ctx.chain);
9638                         }
9639                         nft_trans_destroy(trans);
9640                         break;
9641                 case NFT_MSG_NEWRULE:
9642                         trans->ctx.chain->use--;
9643                         list_del_rcu(&nft_trans_rule(trans)->list);
9644                         nft_rule_expr_deactivate(&trans->ctx,
9645                                                  nft_trans_rule(trans),
9646                                                  NFT_TRANS_ABORT);
9647                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9648                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9649                         break;
9650                 case NFT_MSG_DELRULE:
9651                 case NFT_MSG_DESTROYRULE:
9652                         trans->ctx.chain->use++;
9653                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9654                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9655                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9656                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9657
9658                         nft_trans_destroy(trans);
9659                         break;
9660                 case NFT_MSG_NEWSET:
9661                         if (nft_trans_set_update(trans)) {
9662                                 nft_trans_destroy(trans);
9663                                 break;
9664                         }
9665                         trans->ctx.table->use--;
9666                         if (nft_trans_set_bound(trans)) {
9667                                 nft_trans_destroy(trans);
9668                                 break;
9669                         }
9670                         list_del_rcu(&nft_trans_set(trans)->list);
9671                         break;
9672                 case NFT_MSG_DELSET:
9673                 case NFT_MSG_DESTROYSET:
9674                         trans->ctx.table->use++;
9675                         nft_clear(trans->ctx.net, nft_trans_set(trans));
9676                         nft_trans_destroy(trans);
9677                         break;
9678                 case NFT_MSG_NEWSETELEM:
9679                         if (nft_trans_elem_set_bound(trans)) {
9680                                 nft_trans_destroy(trans);
9681                                 break;
9682                         }
9683                         te = (struct nft_trans_elem *)trans->data;
9684                         nft_setelem_remove(net, te->set, &te->elem);
9685                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9686                                 atomic_dec(&te->set->nelems);
9687                         break;
9688                 case NFT_MSG_DELSETELEM:
9689                 case NFT_MSG_DESTROYSETELEM:
9690                         te = (struct nft_trans_elem *)trans->data;
9691
9692                         nft_setelem_data_activate(net, te->set, &te->elem);
9693                         nft_setelem_activate(net, te->set, &te->elem);
9694                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9695                                 te->set->ndeact--;
9696
9697                         nft_trans_destroy(trans);
9698                         break;
9699                 case NFT_MSG_NEWOBJ:
9700                         if (nft_trans_obj_update(trans)) {
9701                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9702                                 nft_trans_destroy(trans);
9703                         } else {
9704                                 trans->ctx.table->use--;
9705                                 nft_obj_del(nft_trans_obj(trans));
9706                         }
9707                         break;
9708                 case NFT_MSG_DELOBJ:
9709                 case NFT_MSG_DESTROYOBJ:
9710                         trans->ctx.table->use++;
9711                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
9712                         nft_trans_destroy(trans);
9713                         break;
9714                 case NFT_MSG_NEWFLOWTABLE:
9715                         if (nft_trans_flowtable_update(trans)) {
9716                                 nft_unregister_flowtable_net_hooks(net,
9717                                                 &nft_trans_flowtable_hooks(trans));
9718                         } else {
9719                                 trans->ctx.table->use--;
9720                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9721                                 nft_unregister_flowtable_net_hooks(net,
9722                                                 &nft_trans_flowtable(trans)->hook_list);
9723                         }
9724                         break;
9725                 case NFT_MSG_DELFLOWTABLE:
9726                 case NFT_MSG_DESTROYFLOWTABLE:
9727                         if (nft_trans_flowtable_update(trans)) {
9728                                 list_splice(&nft_trans_flowtable_hooks(trans),
9729                                             &nft_trans_flowtable(trans)->hook_list);
9730                         } else {
9731                                 trans->ctx.table->use++;
9732                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9733                         }
9734                         nft_trans_destroy(trans);
9735                         break;
9736                 }
9737         }
9738
9739         synchronize_rcu();
9740
9741         list_for_each_entry_safe_reverse(trans, next,
9742                                          &nft_net->commit_list, list) {
9743                 list_del(&trans->list);
9744                 nf_tables_abort_release(trans);
9745         }
9746
9747         if (action == NFNL_ABORT_AUTOLOAD)
9748                 nf_tables_module_autoload(net);
9749         else
9750                 nf_tables_module_autoload_cleanup(net);
9751
9752         return 0;
9753 }
9754
9755 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9756                            enum nfnl_abort_action action)
9757 {
9758         struct nftables_pernet *nft_net = nft_pernet(net);
9759         int ret = __nf_tables_abort(net, action);
9760
9761         mutex_unlock(&nft_net->commit_mutex);
9762
9763         return ret;
9764 }
9765
9766 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9767 {
9768         struct nftables_pernet *nft_net = nft_pernet(net);
9769         bool genid_ok;
9770
9771         mutex_lock(&nft_net->commit_mutex);
9772
9773         genid_ok = genid == 0 || nft_net->base_seq == genid;
9774         if (!genid_ok)
9775                 mutex_unlock(&nft_net->commit_mutex);
9776
9777         /* else, commit mutex has to be released by commit or abort function */
9778         return genid_ok;
9779 }
9780
9781 static const struct nfnetlink_subsystem nf_tables_subsys = {
9782         .name           = "nf_tables",
9783         .subsys_id      = NFNL_SUBSYS_NFTABLES,
9784         .cb_count       = NFT_MSG_MAX,
9785         .cb             = nf_tables_cb,
9786         .commit         = nf_tables_commit,
9787         .abort          = nf_tables_abort,
9788         .valid_genid    = nf_tables_valid_genid,
9789         .owner          = THIS_MODULE,
9790 };
9791
9792 int nft_chain_validate_dependency(const struct nft_chain *chain,
9793                                   enum nft_chain_types type)
9794 {
9795         const struct nft_base_chain *basechain;
9796
9797         if (nft_is_base_chain(chain)) {
9798                 basechain = nft_base_chain(chain);
9799                 if (basechain->type->type != type)
9800                         return -EOPNOTSUPP;
9801         }
9802         return 0;
9803 }
9804 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9805
9806 int nft_chain_validate_hooks(const struct nft_chain *chain,
9807                              unsigned int hook_flags)
9808 {
9809         struct nft_base_chain *basechain;
9810
9811         if (nft_is_base_chain(chain)) {
9812                 basechain = nft_base_chain(chain);
9813
9814                 if ((1 << basechain->ops.hooknum) & hook_flags)
9815                         return 0;
9816
9817                 return -EOPNOTSUPP;
9818         }
9819
9820         return 0;
9821 }
9822 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9823
9824 /*
9825  * Loop detection - walk through the ruleset beginning at the destination chain
9826  * of a new jump until either the source chain is reached (loop) or all
9827  * reachable chains have been traversed.
9828  *
9829  * The loop check is performed whenever a new jump verdict is added to an
9830  * expression or verdict map or a verdict map is bound to a new chain.
9831  */
9832
9833 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9834                                  const struct nft_chain *chain);
9835
9836 static int nft_check_loops(const struct nft_ctx *ctx,
9837                            const struct nft_set_ext *ext)
9838 {
9839         const struct nft_data *data;
9840         int ret;
9841
9842         data = nft_set_ext_data(ext);
9843         switch (data->verdict.code) {
9844         case NFT_JUMP:
9845         case NFT_GOTO:
9846                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9847                 break;
9848         default:
9849                 ret = 0;
9850                 break;
9851         }
9852
9853         return ret;
9854 }
9855
9856 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9857                                         struct nft_set *set,
9858                                         const struct nft_set_iter *iter,
9859                                         struct nft_set_elem *elem)
9860 {
9861         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9862
9863         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9864             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9865                 return 0;
9866
9867         return nft_check_loops(ctx, ext);
9868 }
9869
9870 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9871                                   struct nft_set *set)
9872 {
9873         u8 genmask = nft_genmask_next(ctx->net);
9874         struct nft_set_elem_catchall *catchall;
9875         struct nft_set_ext *ext;
9876         int ret = 0;
9877
9878         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9879                 ext = nft_set_elem_ext(set, catchall->elem);
9880                 if (!nft_set_elem_active(ext, genmask))
9881                         continue;
9882
9883                 ret = nft_check_loops(ctx, ext);
9884                 if (ret < 0)
9885                         return ret;
9886         }
9887
9888         return ret;
9889 }
9890
9891 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9892                                  const struct nft_chain *chain)
9893 {
9894         const struct nft_rule *rule;
9895         const struct nft_expr *expr, *last;
9896         struct nft_set *set;
9897         struct nft_set_binding *binding;
9898         struct nft_set_iter iter;
9899
9900         if (ctx->chain == chain)
9901                 return -ELOOP;
9902
9903         list_for_each_entry(rule, &chain->rules, list) {
9904                 nft_rule_for_each_expr(expr, last, rule) {
9905                         struct nft_immediate_expr *priv;
9906                         const struct nft_data *data;
9907                         int err;
9908
9909                         if (strcmp(expr->ops->type->name, "immediate"))
9910                                 continue;
9911
9912                         priv = nft_expr_priv(expr);
9913                         if (priv->dreg != NFT_REG_VERDICT)
9914                                 continue;
9915
9916                         data = &priv->data;
9917                         switch (data->verdict.code) {
9918                         case NFT_JUMP:
9919                         case NFT_GOTO:
9920                                 err = nf_tables_check_loops(ctx,
9921                                                         data->verdict.chain);
9922                                 if (err < 0)
9923                                         return err;
9924                                 break;
9925                         default:
9926                                 break;
9927                         }
9928                 }
9929         }
9930
9931         list_for_each_entry(set, &ctx->table->sets, list) {
9932                 if (!nft_is_active_next(ctx->net, set))
9933                         continue;
9934                 if (!(set->flags & NFT_SET_MAP) ||
9935                     set->dtype != NFT_DATA_VERDICT)
9936                         continue;
9937
9938                 list_for_each_entry(binding, &set->bindings, list) {
9939                         if (!(binding->flags & NFT_SET_MAP) ||
9940                             binding->chain != chain)
9941                                 continue;
9942
9943                         iter.genmask    = nft_genmask_next(ctx->net);
9944                         iter.skip       = 0;
9945                         iter.count      = 0;
9946                         iter.err        = 0;
9947                         iter.fn         = nf_tables_loop_check_setelem;
9948
9949                         set->ops->walk(ctx, set, &iter);
9950                         if (!iter.err)
9951                                 iter.err = nft_set_catchall_loops(ctx, set);
9952
9953                         if (iter.err < 0)
9954                                 return iter.err;
9955                 }
9956         }
9957
9958         return 0;
9959 }
9960
9961 /**
9962  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
9963  *
9964  *      @attr: netlink attribute to fetch value from
9965  *      @max: maximum value to be stored in dest
9966  *      @dest: pointer to the variable
9967  *
9968  *      Parse, check and store a given u32 netlink attribute into variable.
9969  *      This function returns -ERANGE if the value goes over maximum value.
9970  *      Otherwise a 0 is returned and the attribute value is stored in the
9971  *      destination variable.
9972  */
9973 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9974 {
9975         u32 val;
9976
9977         val = ntohl(nla_get_be32(attr));
9978         if (val > max)
9979                 return -ERANGE;
9980
9981         *dest = val;
9982         return 0;
9983 }
9984 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9985
9986 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
9987 {
9988         unsigned int reg;
9989
9990         reg = ntohl(nla_get_be32(attr));
9991         switch (reg) {
9992         case NFT_REG_VERDICT...NFT_REG_4:
9993                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9994                 break;
9995         case NFT_REG32_00...NFT_REG32_15:
9996                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9997                 break;
9998         default:
9999                 return -ERANGE;
10000         }
10001
10002         return 0;
10003 }
10004
10005 /**
10006  *      nft_dump_register - dump a register value to a netlink attribute
10007  *
10008  *      @skb: socket buffer
10009  *      @attr: attribute number
10010  *      @reg: register number
10011  *
10012  *      Construct a netlink attribute containing the register number. For
10013  *      compatibility reasons, register numbers being a multiple of 4 are
10014  *      translated to the corresponding 128 bit register numbers.
10015  */
10016 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10017 {
10018         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10019                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10020         else
10021                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10022
10023         return nla_put_be32(skb, attr, htonl(reg));
10024 }
10025 EXPORT_SYMBOL_GPL(nft_dump_register);
10026
10027 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10028 {
10029         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10030                 return -EINVAL;
10031         if (len == 0)
10032                 return -EINVAL;
10033         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10034                 return -ERANGE;
10035
10036         return 0;
10037 }
10038
10039 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10040 {
10041         u32 reg;
10042         int err;
10043
10044         err = nft_parse_register(attr, &reg);
10045         if (err < 0)
10046                 return err;
10047
10048         err = nft_validate_register_load(reg, len);
10049         if (err < 0)
10050                 return err;
10051
10052         *sreg = reg;
10053         return 0;
10054 }
10055 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10056
10057 static int nft_validate_register_store(const struct nft_ctx *ctx,
10058                                        enum nft_registers reg,
10059                                        const struct nft_data *data,
10060                                        enum nft_data_types type,
10061                                        unsigned int len)
10062 {
10063         int err;
10064
10065         switch (reg) {
10066         case NFT_REG_VERDICT:
10067                 if (type != NFT_DATA_VERDICT)
10068                         return -EINVAL;
10069
10070                 if (data != NULL &&
10071                     (data->verdict.code == NFT_GOTO ||
10072                      data->verdict.code == NFT_JUMP)) {
10073                         err = nf_tables_check_loops(ctx, data->verdict.chain);
10074                         if (err < 0)
10075                                 return err;
10076                 }
10077
10078                 return 0;
10079         default:
10080                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10081                         return -EINVAL;
10082                 if (len == 0)
10083                         return -EINVAL;
10084                 if (reg * NFT_REG32_SIZE + len >
10085                     sizeof_field(struct nft_regs, data))
10086                         return -ERANGE;
10087
10088                 if (data != NULL && type != NFT_DATA_VALUE)
10089                         return -EINVAL;
10090                 return 0;
10091         }
10092 }
10093
10094 int nft_parse_register_store(const struct nft_ctx *ctx,
10095                              const struct nlattr *attr, u8 *dreg,
10096                              const struct nft_data *data,
10097                              enum nft_data_types type, unsigned int len)
10098 {
10099         int err;
10100         u32 reg;
10101
10102         err = nft_parse_register(attr, &reg);
10103         if (err < 0)
10104                 return err;
10105
10106         err = nft_validate_register_store(ctx, reg, data, type, len);
10107         if (err < 0)
10108                 return err;
10109
10110         *dreg = reg;
10111         return 0;
10112 }
10113 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10114
10115 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10116         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
10117         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
10118                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
10119         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10120 };
10121
10122 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10123                             struct nft_data_desc *desc, const struct nlattr *nla)
10124 {
10125         u8 genmask = nft_genmask_next(ctx->net);
10126         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10127         struct nft_chain *chain;
10128         int err;
10129
10130         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10131                                           nft_verdict_policy, NULL);
10132         if (err < 0)
10133                 return err;
10134
10135         if (!tb[NFTA_VERDICT_CODE])
10136                 return -EINVAL;
10137         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10138
10139         switch (data->verdict.code) {
10140         default:
10141                 switch (data->verdict.code & NF_VERDICT_MASK) {
10142                 case NF_ACCEPT:
10143                 case NF_DROP:
10144                 case NF_QUEUE:
10145                         break;
10146                 default:
10147                         return -EINVAL;
10148                 }
10149                 fallthrough;
10150         case NFT_CONTINUE:
10151         case NFT_BREAK:
10152         case NFT_RETURN:
10153                 break;
10154         case NFT_JUMP:
10155         case NFT_GOTO:
10156                 if (tb[NFTA_VERDICT_CHAIN]) {
10157                         chain = nft_chain_lookup(ctx->net, ctx->table,
10158                                                  tb[NFTA_VERDICT_CHAIN],
10159                                                  genmask);
10160                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10161                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10162                                                       tb[NFTA_VERDICT_CHAIN_ID]);
10163                         if (IS_ERR(chain))
10164                                 return PTR_ERR(chain);
10165                 } else {
10166                         return -EINVAL;
10167                 }
10168
10169                 if (IS_ERR(chain))
10170                         return PTR_ERR(chain);
10171                 if (nft_is_base_chain(chain))
10172                         return -EOPNOTSUPP;
10173                 if (nft_chain_is_bound(chain))
10174                         return -EINVAL;
10175                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10176                     chain->flags & NFT_CHAIN_BINDING)
10177                         return -EINVAL;
10178
10179                 chain->use++;
10180                 data->verdict.chain = chain;
10181                 break;
10182         }
10183
10184         desc->len = sizeof(data->verdict);
10185
10186         return 0;
10187 }
10188
10189 static void nft_verdict_uninit(const struct nft_data *data)
10190 {
10191         struct nft_chain *chain;
10192         struct nft_rule *rule;
10193
10194         switch (data->verdict.code) {
10195         case NFT_JUMP:
10196         case NFT_GOTO:
10197                 chain = data->verdict.chain;
10198                 chain->use--;
10199
10200                 if (!nft_chain_is_bound(chain))
10201                         break;
10202
10203                 chain->table->use--;
10204                 list_for_each_entry(rule, &chain->rules, list)
10205                         chain->use--;
10206
10207                 nft_chain_del(chain);
10208                 break;
10209         }
10210 }
10211
10212 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10213 {
10214         struct nlattr *nest;
10215
10216         nest = nla_nest_start_noflag(skb, type);
10217         if (!nest)
10218                 goto nla_put_failure;
10219
10220         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10221                 goto nla_put_failure;
10222
10223         switch (v->code) {
10224         case NFT_JUMP:
10225         case NFT_GOTO:
10226                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10227                                    v->chain->name))
10228                         goto nla_put_failure;
10229         }
10230         nla_nest_end(skb, nest);
10231         return 0;
10232
10233 nla_put_failure:
10234         return -1;
10235 }
10236
10237 static int nft_value_init(const struct nft_ctx *ctx,
10238                           struct nft_data *data, struct nft_data_desc *desc,
10239                           const struct nlattr *nla)
10240 {
10241         unsigned int len;
10242
10243         len = nla_len(nla);
10244         if (len == 0)
10245                 return -EINVAL;
10246         if (len > desc->size)
10247                 return -EOVERFLOW;
10248         if (desc->len) {
10249                 if (len != desc->len)
10250                         return -EINVAL;
10251         } else {
10252                 desc->len = len;
10253         }
10254
10255         nla_memcpy(data->data, nla, len);
10256
10257         return 0;
10258 }
10259
10260 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10261                           unsigned int len)
10262 {
10263         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10264 }
10265
10266 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10267         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
10268         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
10269 };
10270
10271 /**
10272  *      nft_data_init - parse nf_tables data netlink attributes
10273  *
10274  *      @ctx: context of the expression using the data
10275  *      @data: destination struct nft_data
10276  *      @desc: data description
10277  *      @nla: netlink attribute containing data
10278  *
10279  *      Parse the netlink data attributes and initialize a struct nft_data.
10280  *      The type and length of data are returned in the data description.
10281  *
10282  *      The caller can indicate that it only wants to accept data of type
10283  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
10284  */
10285 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
10286                   struct nft_data_desc *desc, const struct nlattr *nla)
10287 {
10288         struct nlattr *tb[NFTA_DATA_MAX + 1];
10289         int err;
10290
10291         if (WARN_ON_ONCE(!desc->size))
10292                 return -EINVAL;
10293
10294         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
10295                                           nft_data_policy, NULL);
10296         if (err < 0)
10297                 return err;
10298
10299         if (tb[NFTA_DATA_VALUE]) {
10300                 if (desc->type != NFT_DATA_VALUE)
10301                         return -EINVAL;
10302
10303                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
10304         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
10305                 if (desc->type != NFT_DATA_VERDICT)
10306                         return -EINVAL;
10307
10308                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
10309         } else {
10310                 err = -EINVAL;
10311         }
10312
10313         return err;
10314 }
10315 EXPORT_SYMBOL_GPL(nft_data_init);
10316
10317 /**
10318  *      nft_data_release - release a nft_data item
10319  *
10320  *      @data: struct nft_data to release
10321  *      @type: type of data
10322  *
10323  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
10324  *      all others need to be released by calling this function.
10325  */
10326 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
10327 {
10328         if (type < NFT_DATA_VERDICT)
10329                 return;
10330         switch (type) {
10331         case NFT_DATA_VERDICT:
10332                 return nft_verdict_uninit(data);
10333         default:
10334                 WARN_ON(1);
10335         }
10336 }
10337 EXPORT_SYMBOL_GPL(nft_data_release);
10338
10339 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
10340                   enum nft_data_types type, unsigned int len)
10341 {
10342         struct nlattr *nest;
10343         int err;
10344
10345         nest = nla_nest_start_noflag(skb, attr);
10346         if (nest == NULL)
10347                 return -1;
10348
10349         switch (type) {
10350         case NFT_DATA_VALUE:
10351                 err = nft_value_dump(skb, data, len);
10352                 break;
10353         case NFT_DATA_VERDICT:
10354                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
10355                 break;
10356         default:
10357                 err = -EINVAL;
10358                 WARN_ON(1);
10359         }
10360
10361         nla_nest_end(skb, nest);
10362         return err;
10363 }
10364 EXPORT_SYMBOL_GPL(nft_data_dump);
10365
10366 int __nft_release_basechain(struct nft_ctx *ctx)
10367 {
10368         struct nft_rule *rule, *nr;
10369
10370         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
10371                 return 0;
10372
10373         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
10374         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
10375                 list_del(&rule->list);
10376                 ctx->chain->use--;
10377                 nf_tables_rule_release(ctx, rule);
10378         }
10379         nft_chain_del(ctx->chain);
10380         ctx->table->use--;
10381         nf_tables_chain_destroy(ctx);
10382
10383         return 0;
10384 }
10385 EXPORT_SYMBOL_GPL(__nft_release_basechain);
10386
10387 static void __nft_release_hook(struct net *net, struct nft_table *table)
10388 {
10389         struct nft_flowtable *flowtable;
10390         struct nft_chain *chain;
10391
10392         list_for_each_entry(chain, &table->chains, list)
10393                 __nf_tables_unregister_hook(net, table, chain, true);
10394         list_for_each_entry(flowtable, &table->flowtables, list)
10395                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
10396                                                      true);
10397 }
10398
10399 static void __nft_release_hooks(struct net *net)
10400 {
10401         struct nftables_pernet *nft_net = nft_pernet(net);
10402         struct nft_table *table;
10403
10404         list_for_each_entry(table, &nft_net->tables, list) {
10405                 if (nft_table_has_owner(table))
10406                         continue;
10407
10408                 __nft_release_hook(net, table);
10409         }
10410 }
10411
10412 static void __nft_release_table(struct net *net, struct nft_table *table)
10413 {
10414         struct nft_flowtable *flowtable, *nf;
10415         struct nft_chain *chain, *nc;
10416         struct nft_object *obj, *ne;
10417         struct nft_rule *rule, *nr;
10418         struct nft_set *set, *ns;
10419         struct nft_ctx ctx = {
10420                 .net    = net,
10421                 .family = NFPROTO_NETDEV,
10422         };
10423
10424         ctx.family = table->family;
10425         ctx.table = table;
10426         list_for_each_entry(chain, &table->chains, list) {
10427                 ctx.chain = chain;
10428                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
10429                         list_del(&rule->list);
10430                         chain->use--;
10431                         nf_tables_rule_release(&ctx, rule);
10432                 }
10433         }
10434         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
10435                 list_del(&flowtable->list);
10436                 table->use--;
10437                 nf_tables_flowtable_destroy(flowtable);
10438         }
10439         list_for_each_entry_safe(set, ns, &table->sets, list) {
10440                 list_del(&set->list);
10441                 table->use--;
10442                 nft_set_destroy(&ctx, set);
10443         }
10444         list_for_each_entry_safe(obj, ne, &table->objects, list) {
10445                 nft_obj_del(obj);
10446                 table->use--;
10447                 nft_obj_destroy(&ctx, obj);
10448         }
10449         list_for_each_entry_safe(chain, nc, &table->chains, list) {
10450                 ctx.chain = chain;
10451                 nft_chain_del(chain);
10452                 table->use--;
10453                 nf_tables_chain_destroy(&ctx);
10454         }
10455         nf_tables_table_destroy(&ctx);
10456 }
10457
10458 static void __nft_release_tables(struct net *net)
10459 {
10460         struct nftables_pernet *nft_net = nft_pernet(net);
10461         struct nft_table *table, *nt;
10462
10463         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
10464                 if (nft_table_has_owner(table))
10465                         continue;
10466
10467                 list_del(&table->list);
10468
10469                 __nft_release_table(net, table);
10470         }
10471 }
10472
10473 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
10474                             void *ptr)
10475 {
10476         struct nft_table *table, *to_delete[8];
10477         struct nftables_pernet *nft_net;
10478         struct netlink_notify *n = ptr;
10479         struct net *net = n->net;
10480         unsigned int deleted;
10481         bool restart = false;
10482
10483         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
10484                 return NOTIFY_DONE;
10485
10486         nft_net = nft_pernet(net);
10487         deleted = 0;
10488         mutex_lock(&nft_net->commit_mutex);
10489         if (!list_empty(&nf_tables_destroy_list))
10490                 rcu_barrier();
10491 again:
10492         list_for_each_entry(table, &nft_net->tables, list) {
10493                 if (nft_table_has_owner(table) &&
10494                     n->portid == table->nlpid) {
10495                         __nft_release_hook(net, table);
10496                         list_del_rcu(&table->list);
10497                         to_delete[deleted++] = table;
10498                         if (deleted >= ARRAY_SIZE(to_delete))
10499                                 break;
10500                 }
10501         }
10502         if (deleted) {
10503                 restart = deleted >= ARRAY_SIZE(to_delete);
10504                 synchronize_rcu();
10505                 while (deleted)
10506                         __nft_release_table(net, to_delete[--deleted]);
10507
10508                 if (restart)
10509                         goto again;
10510         }
10511         mutex_unlock(&nft_net->commit_mutex);
10512
10513         return NOTIFY_DONE;
10514 }
10515
10516 static struct notifier_block nft_nl_notifier = {
10517         .notifier_call  = nft_rcv_nl_event,
10518 };
10519
10520 static int __net_init nf_tables_init_net(struct net *net)
10521 {
10522         struct nftables_pernet *nft_net = nft_pernet(net);
10523
10524         INIT_LIST_HEAD(&nft_net->tables);
10525         INIT_LIST_HEAD(&nft_net->commit_list);
10526         INIT_LIST_HEAD(&nft_net->module_list);
10527         INIT_LIST_HEAD(&nft_net->notify_list);
10528         mutex_init(&nft_net->commit_mutex);
10529         nft_net->base_seq = 1;
10530
10531         return 0;
10532 }
10533
10534 static void __net_exit nf_tables_pre_exit_net(struct net *net)
10535 {
10536         struct nftables_pernet *nft_net = nft_pernet(net);
10537
10538         mutex_lock(&nft_net->commit_mutex);
10539         __nft_release_hooks(net);
10540         mutex_unlock(&nft_net->commit_mutex);
10541 }
10542
10543 static void __net_exit nf_tables_exit_net(struct net *net)
10544 {
10545         struct nftables_pernet *nft_net = nft_pernet(net);
10546
10547         mutex_lock(&nft_net->commit_mutex);
10548         if (!list_empty(&nft_net->commit_list) ||
10549             !list_empty(&nft_net->module_list))
10550                 __nf_tables_abort(net, NFNL_ABORT_NONE);
10551         __nft_release_tables(net);
10552         mutex_unlock(&nft_net->commit_mutex);
10553         WARN_ON_ONCE(!list_empty(&nft_net->tables));
10554         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
10555         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10556 }
10557
10558 static struct pernet_operations nf_tables_net_ops = {
10559         .init           = nf_tables_init_net,
10560         .pre_exit       = nf_tables_pre_exit_net,
10561         .exit           = nf_tables_exit_net,
10562         .id             = &nf_tables_net_id,
10563         .size           = sizeof(struct nftables_pernet),
10564 };
10565
10566 static int __init nf_tables_module_init(void)
10567 {
10568         int err;
10569
10570         err = register_pernet_subsys(&nf_tables_net_ops);
10571         if (err < 0)
10572                 return err;
10573
10574         err = nft_chain_filter_init();
10575         if (err < 0)
10576                 goto err_chain_filter;
10577
10578         err = nf_tables_core_module_init();
10579         if (err < 0)
10580                 goto err_core_module;
10581
10582         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10583         if (err < 0)
10584                 goto err_netdev_notifier;
10585
10586         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10587         if (err < 0)
10588                 goto err_rht_objname;
10589
10590         err = nft_offload_init();
10591         if (err < 0)
10592                 goto err_offload;
10593
10594         err = netlink_register_notifier(&nft_nl_notifier);
10595         if (err < 0)
10596                 goto err_netlink_notifier;
10597
10598         /* must be last */
10599         err = nfnetlink_subsys_register(&nf_tables_subsys);
10600         if (err < 0)
10601                 goto err_nfnl_subsys;
10602
10603         nft_chain_route_init();
10604
10605         return err;
10606
10607 err_nfnl_subsys:
10608         netlink_unregister_notifier(&nft_nl_notifier);
10609 err_netlink_notifier:
10610         nft_offload_exit();
10611 err_offload:
10612         rhltable_destroy(&nft_objname_ht);
10613 err_rht_objname:
10614         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10615 err_netdev_notifier:
10616         nf_tables_core_module_exit();
10617 err_core_module:
10618         nft_chain_filter_fini();
10619 err_chain_filter:
10620         unregister_pernet_subsys(&nf_tables_net_ops);
10621         return err;
10622 }
10623
10624 static void __exit nf_tables_module_exit(void)
10625 {
10626         nfnetlink_subsys_unregister(&nf_tables_subsys);
10627         netlink_unregister_notifier(&nft_nl_notifier);
10628         nft_offload_exit();
10629         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10630         nft_chain_filter_fini();
10631         nft_chain_route_fini();
10632         unregister_pernet_subsys(&nf_tables_net_ops);
10633         cancel_work_sync(&trans_destroy_work);
10634         rcu_barrier();
10635         rhltable_destroy(&nft_objname_ht);
10636         nf_tables_core_module_exit();
10637 }
10638
10639 module_init(nf_tables_module_init);
10640 module_exit(nf_tables_module_exit);
10641
10642 MODULE_LICENSE("GPL");
10643 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10644 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);