2 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/list.h>
14 #include <linux/skbuff.h>
15 #include <linux/netlink.h>
16 #include <linux/vmalloc.h>
17 #include <linux/rhashtable.h>
18 #include <linux/netfilter.h>
19 #include <linux/netfilter/nfnetlink.h>
20 #include <linux/netfilter/nf_tables.h>
21 #include <net/netfilter/nf_flow_table.h>
22 #include <net/netfilter/nf_tables_core.h>
23 #include <net/netfilter/nf_tables.h>
24 #include <net/net_namespace.h>
27 static LIST_HEAD(nf_tables_expressions);
28 static LIST_HEAD(nf_tables_objects);
29 static LIST_HEAD(nf_tables_flowtables);
30 static LIST_HEAD(nf_tables_destroy_list);
31 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
32 static u64 table_handle;
35 NFT_VALIDATE_SKIP = 0,
40 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
41 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
42 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
44 static const struct rhashtable_params nft_chain_ht_params = {
45 .head_offset = offsetof(struct nft_chain, rhlhead),
46 .key_offset = offsetof(struct nft_chain, name),
47 .hashfn = nft_chain_hash,
48 .obj_hashfn = nft_chain_hash_obj,
49 .obj_cmpfn = nft_chain_hash_cmp,
51 .automatic_shrinking = true,
54 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
56 switch (net->nft.validate_state) {
57 case NFT_VALIDATE_SKIP:
58 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
60 case NFT_VALIDATE_NEED:
63 if (new_validate_state == NFT_VALIDATE_NEED)
67 net->nft.validate_state = new_validate_state;
69 static void nf_tables_trans_destroy_work(struct work_struct *w);
70 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
72 static void nft_ctx_init(struct nft_ctx *ctx,
74 const struct sk_buff *skb,
75 const struct nlmsghdr *nlh,
77 struct nft_table *table,
78 struct nft_chain *chain,
79 const struct nlattr * const *nla)
87 ctx->portid = NETLINK_CB(skb).portid;
88 ctx->report = nlmsg_report(nlh);
89 ctx->seq = nlh->nlmsg_seq;
92 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
93 int msg_type, u32 size, gfp_t gfp)
95 struct nft_trans *trans;
97 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
101 trans->msg_type = msg_type;
107 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
108 int msg_type, u32 size)
110 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
113 static void nft_trans_destroy(struct nft_trans *trans)
115 list_del(&trans->list);
119 static int nf_tables_register_hook(struct net *net,
120 const struct nft_table *table,
121 struct nft_chain *chain)
123 const struct nft_base_chain *basechain;
124 const struct nf_hook_ops *ops;
126 if (table->flags & NFT_TABLE_F_DORMANT ||
127 !nft_is_base_chain(chain))
130 basechain = nft_base_chain(chain);
131 ops = &basechain->ops;
133 if (basechain->type->ops_register)
134 return basechain->type->ops_register(net, ops);
136 return nf_register_net_hook(net, ops);
139 static void nf_tables_unregister_hook(struct net *net,
140 const struct nft_table *table,
141 struct nft_chain *chain)
143 const struct nft_base_chain *basechain;
144 const struct nf_hook_ops *ops;
146 if (table->flags & NFT_TABLE_F_DORMANT ||
147 !nft_is_base_chain(chain))
149 basechain = nft_base_chain(chain);
150 ops = &basechain->ops;
152 if (basechain->type->ops_unregister)
153 return basechain->type->ops_unregister(net, ops);
155 nf_unregister_net_hook(net, ops);
158 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
160 struct nft_trans *trans;
162 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
166 if (msg_type == NFT_MSG_NEWTABLE)
167 nft_activate_next(ctx->net, ctx->table);
169 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
173 static int nft_deltable(struct nft_ctx *ctx)
177 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
181 nft_deactivate_next(ctx->net, ctx->table);
185 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
187 struct nft_trans *trans;
189 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
193 if (msg_type == NFT_MSG_NEWCHAIN)
194 nft_activate_next(ctx->net, ctx->chain);
196 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
200 static int nft_delchain(struct nft_ctx *ctx)
204 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
209 nft_deactivate_next(ctx->net, ctx->chain);
214 /* either expr ops provide both activate/deactivate, or neither */
215 static bool nft_expr_check_ops(const struct nft_expr_ops *ops)
220 if (WARN_ON_ONCE((!ops->activate ^ !ops->deactivate)))
226 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
227 struct nft_rule *rule)
229 struct nft_expr *expr;
231 expr = nft_expr_first(rule);
232 while (expr != nft_expr_last(rule) && expr->ops) {
233 if (expr->ops->activate)
234 expr->ops->activate(ctx, expr);
236 expr = nft_expr_next(expr);
240 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
241 struct nft_rule *rule)
243 struct nft_expr *expr;
245 expr = nft_expr_first(rule);
246 while (expr != nft_expr_last(rule) && expr->ops) {
247 if (expr->ops->deactivate)
248 expr->ops->deactivate(ctx, expr);
250 expr = nft_expr_next(expr);
255 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
257 /* You cannot delete the same rule twice */
258 if (nft_is_active_next(ctx->net, rule)) {
259 nft_deactivate_next(ctx->net, rule);
266 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
267 struct nft_rule *rule)
269 struct nft_trans *trans;
271 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
275 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
276 nft_trans_rule_id(trans) =
277 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
279 nft_trans_rule(trans) = rule;
280 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
285 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
287 struct nft_trans *trans;
290 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
294 err = nf_tables_delrule_deactivate(ctx, rule);
296 nft_trans_destroy(trans);
299 nft_rule_expr_deactivate(ctx, rule);
304 static int nft_delrule_by_chain(struct nft_ctx *ctx)
306 struct nft_rule *rule;
309 list_for_each_entry(rule, &ctx->chain->rules, list) {
310 err = nft_delrule(ctx, rule);
317 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
320 struct nft_trans *trans;
322 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
326 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
327 nft_trans_set_id(trans) =
328 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
329 nft_activate_next(ctx->net, set);
331 nft_trans_set(trans) = set;
332 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
337 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
341 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
345 nft_deactivate_next(ctx->net, set);
351 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
352 struct nft_object *obj)
354 struct nft_trans *trans;
356 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
360 if (msg_type == NFT_MSG_NEWOBJ)
361 nft_activate_next(ctx->net, obj);
363 nft_trans_obj(trans) = obj;
364 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
369 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
373 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
377 nft_deactivate_next(ctx->net, obj);
383 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
384 struct nft_flowtable *flowtable)
386 struct nft_trans *trans;
388 trans = nft_trans_alloc(ctx, msg_type,
389 sizeof(struct nft_trans_flowtable));
393 if (msg_type == NFT_MSG_NEWFLOWTABLE)
394 nft_activate_next(ctx->net, flowtable);
396 nft_trans_flowtable(trans) = flowtable;
397 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
402 static int nft_delflowtable(struct nft_ctx *ctx,
403 struct nft_flowtable *flowtable)
407 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
411 nft_deactivate_next(ctx->net, flowtable);
421 static struct nft_table *nft_table_lookup(const struct net *net,
422 const struct nlattr *nla,
423 u8 family, u8 genmask)
425 struct nft_table *table;
428 return ERR_PTR(-EINVAL);
430 list_for_each_entry_rcu(table, &net->nft.tables, list) {
431 if (!nla_strcmp(nla, table->name) &&
432 table->family == family &&
433 nft_active_genmask(table, genmask))
437 return ERR_PTR(-ENOENT);
440 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
441 const struct nlattr *nla,
444 struct nft_table *table;
446 list_for_each_entry(table, &net->nft.tables, list) {
447 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
448 nft_active_genmask(table, genmask))
452 return ERR_PTR(-ENOENT);
455 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
457 return ++table->hgenerator;
460 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
462 static const struct nft_chain_type *
463 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
467 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
468 if (chain_type[family][i] != NULL &&
469 !nla_strcmp(nla, chain_type[family][i]->name))
470 return chain_type[family][i];
476 * Loading a module requires dropping mutex that guards the
478 * We first need to abort any pending transactions as once
479 * mutex is unlocked a different client could start a new
480 * transaction. It must not see any 'future generation'
481 * changes * as these changes will never happen.
483 #ifdef CONFIG_MODULES
484 static int __nf_tables_abort(struct net *net);
486 static void nft_request_module(struct net *net, const char *fmt, ...)
488 char module_name[MODULE_NAME_LEN];
492 __nf_tables_abort(net);
495 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
497 if (WARN(ret >= MODULE_NAME_LEN, "truncated: '%s' (len %d)", module_name, ret))
500 mutex_unlock(&net->nft.commit_mutex);
501 request_module("%s", module_name);
502 mutex_lock(&net->nft.commit_mutex);
506 static void lockdep_nfnl_nft_mutex_not_held(void)
508 #ifdef CONFIG_PROVE_LOCKING
509 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
513 static const struct nft_chain_type *
514 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
515 u8 family, bool autoload)
517 const struct nft_chain_type *type;
519 type = __nf_tables_chain_type_lookup(nla, family);
523 lockdep_nfnl_nft_mutex_not_held();
524 #ifdef CONFIG_MODULES
526 nft_request_module(net, "nft-chain-%u-%.*s", family,
527 nla_len(nla), (const char *)nla_data(nla));
528 type = __nf_tables_chain_type_lookup(nla, family);
530 return ERR_PTR(-EAGAIN);
533 return ERR_PTR(-ENOENT);
536 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
537 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
538 .len = NFT_TABLE_MAXNAMELEN - 1 },
539 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
540 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
543 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
544 u32 portid, u32 seq, int event, u32 flags,
545 int family, const struct nft_table *table)
547 struct nlmsghdr *nlh;
548 struct nfgenmsg *nfmsg;
550 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
551 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
553 goto nla_put_failure;
555 nfmsg = nlmsg_data(nlh);
556 nfmsg->nfgen_family = family;
557 nfmsg->version = NFNETLINK_V0;
558 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
560 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
561 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
562 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
563 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
565 goto nla_put_failure;
571 nlmsg_trim(skb, nlh);
575 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
581 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
584 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
588 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
589 event, 0, ctx->family, ctx->table);
595 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
596 ctx->report, GFP_KERNEL);
599 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
602 static int nf_tables_dump_tables(struct sk_buff *skb,
603 struct netlink_callback *cb)
605 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
606 const struct nft_table *table;
607 unsigned int idx = 0, s_idx = cb->args[0];
608 struct net *net = sock_net(skb->sk);
609 int family = nfmsg->nfgen_family;
612 cb->seq = net->nft.base_seq;
614 list_for_each_entry_rcu(table, &net->nft.tables, list) {
615 if (family != NFPROTO_UNSPEC && family != table->family)
621 memset(&cb->args[1], 0,
622 sizeof(cb->args) - sizeof(cb->args[0]));
623 if (!nft_is_active(net, table))
625 if (nf_tables_fill_table_info(skb, net,
626 NETLINK_CB(cb->skb).portid,
628 NFT_MSG_NEWTABLE, NLM_F_MULTI,
629 table->family, table) < 0)
632 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
642 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
643 const struct nlmsghdr *nlh,
644 struct netlink_dump_control *c)
648 if (!try_module_get(THIS_MODULE))
652 err = netlink_dump_start(nlsk, skb, nlh, c);
654 module_put(THIS_MODULE);
659 /* called with rcu_read_lock held */
660 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
661 struct sk_buff *skb, const struct nlmsghdr *nlh,
662 const struct nlattr * const nla[],
663 struct netlink_ext_ack *extack)
665 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
666 u8 genmask = nft_genmask_cur(net);
667 const struct nft_table *table;
668 struct sk_buff *skb2;
669 int family = nfmsg->nfgen_family;
672 if (nlh->nlmsg_flags & NLM_F_DUMP) {
673 struct netlink_dump_control c = {
674 .dump = nf_tables_dump_tables,
675 .module = THIS_MODULE,
678 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
681 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
683 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
684 return PTR_ERR(table);
687 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
691 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
692 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
697 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
704 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
706 struct nft_chain *chain;
709 list_for_each_entry(chain, &table->chains, list) {
710 if (!nft_is_active_next(net, chain))
712 if (!nft_is_base_chain(chain))
715 if (cnt && i++ == cnt)
718 nf_unregister_net_hook(net, &nft_base_chain(chain)->ops);
722 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
724 struct nft_chain *chain;
727 list_for_each_entry(chain, &table->chains, list) {
728 if (!nft_is_active_next(net, chain))
730 if (!nft_is_base_chain(chain))
733 err = nf_register_net_hook(net, &nft_base_chain(chain)->ops);
742 nft_table_disable(net, table, i);
746 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
748 nft_table_disable(net, table, 0);
751 static int nf_tables_updtable(struct nft_ctx *ctx)
753 struct nft_trans *trans;
757 if (!ctx->nla[NFTA_TABLE_FLAGS])
760 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
761 if (flags & ~NFT_TABLE_F_DORMANT)
764 if (flags == ctx->table->flags)
767 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
768 sizeof(struct nft_trans_table));
772 if ((flags & NFT_TABLE_F_DORMANT) &&
773 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
774 nft_trans_table_enable(trans) = false;
775 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
776 ctx->table->flags & NFT_TABLE_F_DORMANT) {
777 ret = nf_tables_table_enable(ctx->net, ctx->table);
779 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
780 nft_trans_table_enable(trans) = true;
786 nft_trans_table_update(trans) = true;
787 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
790 nft_trans_destroy(trans);
794 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
796 const char *name = data;
798 return jhash(name, strlen(name), seed);
801 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
803 const struct nft_chain *chain = data;
805 return nft_chain_hash(chain->name, 0, seed);
808 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
811 const struct nft_chain *chain = ptr;
812 const char *name = arg->key;
814 return strcmp(chain->name, name);
817 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
818 struct sk_buff *skb, const struct nlmsghdr *nlh,
819 const struct nlattr * const nla[],
820 struct netlink_ext_ack *extack)
822 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
823 u8 genmask = nft_genmask_next(net);
824 int family = nfmsg->nfgen_family;
825 const struct nlattr *attr;
826 struct nft_table *table;
831 lockdep_assert_held(&net->nft.commit_mutex);
832 attr = nla[NFTA_TABLE_NAME];
833 table = nft_table_lookup(net, attr, family, genmask);
835 if (PTR_ERR(table) != -ENOENT)
836 return PTR_ERR(table);
838 if (nlh->nlmsg_flags & NLM_F_EXCL) {
839 NL_SET_BAD_ATTR(extack, attr);
842 if (nlh->nlmsg_flags & NLM_F_REPLACE)
845 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
846 return nf_tables_updtable(&ctx);
849 if (nla[NFTA_TABLE_FLAGS]) {
850 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
851 if (flags & ~NFT_TABLE_F_DORMANT)
856 table = kzalloc(sizeof(*table), GFP_KERNEL);
860 table->name = nla_strdup(attr, GFP_KERNEL);
861 if (table->name == NULL)
864 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
868 INIT_LIST_HEAD(&table->chains);
869 INIT_LIST_HEAD(&table->sets);
870 INIT_LIST_HEAD(&table->objects);
871 INIT_LIST_HEAD(&table->flowtables);
872 table->family = family;
873 table->flags = flags;
874 table->handle = ++table_handle;
876 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
877 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
881 list_add_tail_rcu(&table->list, &net->nft.tables);
884 rhltable_destroy(&table->chains_ht);
893 static int nft_flush_table(struct nft_ctx *ctx)
895 struct nft_flowtable *flowtable, *nft;
896 struct nft_chain *chain, *nc;
897 struct nft_object *obj, *ne;
898 struct nft_set *set, *ns;
901 list_for_each_entry(chain, &ctx->table->chains, list) {
902 if (!nft_is_active_next(ctx->net, chain))
907 err = nft_delrule_by_chain(ctx);
912 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
913 if (!nft_is_active_next(ctx->net, set))
916 if (nft_set_is_anonymous(set) &&
917 !list_empty(&set->bindings))
920 err = nft_delset(ctx, set);
925 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
926 err = nft_delflowtable(ctx, flowtable);
931 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
932 err = nft_delobj(ctx, obj);
937 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
938 if (!nft_is_active_next(ctx->net, chain))
943 err = nft_delchain(ctx);
948 err = nft_deltable(ctx);
953 static int nft_flush(struct nft_ctx *ctx, int family)
955 struct nft_table *table, *nt;
956 const struct nlattr * const *nla = ctx->nla;
959 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
960 if (family != AF_UNSPEC && table->family != family)
963 ctx->family = table->family;
965 if (!nft_is_active_next(ctx->net, table))
968 if (nla[NFTA_TABLE_NAME] &&
969 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
974 err = nft_flush_table(ctx);
982 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
983 struct sk_buff *skb, const struct nlmsghdr *nlh,
984 const struct nlattr * const nla[],
985 struct netlink_ext_ack *extack)
987 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
988 u8 genmask = nft_genmask_next(net);
989 int family = nfmsg->nfgen_family;
990 const struct nlattr *attr;
991 struct nft_table *table;
994 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
995 if (family == AF_UNSPEC ||
996 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
997 return nft_flush(&ctx, family);
999 if (nla[NFTA_TABLE_HANDLE]) {
1000 attr = nla[NFTA_TABLE_HANDLE];
1001 table = nft_table_lookup_byhandle(net, attr, genmask);
1003 attr = nla[NFTA_TABLE_NAME];
1004 table = nft_table_lookup(net, attr, family, genmask);
1007 if (IS_ERR(table)) {
1008 NL_SET_BAD_ATTR(extack, attr);
1009 return PTR_ERR(table);
1012 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1016 ctx.family = family;
1019 return nft_flush_table(&ctx);
1022 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1024 if (WARN_ON(ctx->table->use > 0))
1027 rhltable_destroy(&ctx->table->chains_ht);
1028 kfree(ctx->table->name);
1032 void nft_register_chain_type(const struct nft_chain_type *ctype)
1034 if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO))
1037 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1038 if (WARN_ON(chain_type[ctype->family][ctype->type] != NULL)) {
1039 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1042 chain_type[ctype->family][ctype->type] = ctype;
1043 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1045 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1047 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1049 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1050 chain_type[ctype->family][ctype->type] = NULL;
1051 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1053 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1059 static struct nft_chain *
1060 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1062 struct nft_chain *chain;
1064 list_for_each_entry(chain, &table->chains, list) {
1065 if (chain->handle == handle &&
1066 nft_active_genmask(chain, genmask))
1070 return ERR_PTR(-ENOENT);
1073 static bool lockdep_commit_lock_is_held(struct net *net)
1075 #ifdef CONFIG_PROVE_LOCKING
1076 return lockdep_is_held(&net->nft.commit_mutex);
1082 static struct nft_chain *nft_chain_lookup(struct net *net,
1083 struct nft_table *table,
1084 const struct nlattr *nla, u8 genmask)
1086 char search[NFT_CHAIN_MAXNAMELEN + 1];
1087 struct rhlist_head *tmp, *list;
1088 struct nft_chain *chain;
1091 return ERR_PTR(-EINVAL);
1093 nla_strlcpy(search, nla, sizeof(search));
1095 WARN_ON(!rcu_read_lock_held() &&
1096 !lockdep_commit_lock_is_held(net));
1098 chain = ERR_PTR(-ENOENT);
1100 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1104 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1105 if (nft_active_genmask(chain, genmask))
1108 chain = ERR_PTR(-ENOENT);
1114 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1115 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1116 .len = NFT_TABLE_MAXNAMELEN - 1 },
1117 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1118 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1119 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1120 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1121 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1122 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
1123 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1126 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1127 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1128 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1129 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1130 .len = IFNAMSIZ - 1 },
1133 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1135 struct nft_stats *cpu_stats, total;
1136 struct nlattr *nest;
1141 memset(&total, 0, sizeof(total));
1142 for_each_possible_cpu(cpu) {
1143 cpu_stats = per_cpu_ptr(stats, cpu);
1145 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1146 pkts = cpu_stats->pkts;
1147 bytes = cpu_stats->bytes;
1148 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1150 total.bytes += bytes;
1152 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
1154 goto nla_put_failure;
1156 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1157 NFTA_COUNTER_PAD) ||
1158 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1160 goto nla_put_failure;
1162 nla_nest_end(skb, nest);
1169 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1170 u32 portid, u32 seq, int event, u32 flags,
1171 int family, const struct nft_table *table,
1172 const struct nft_chain *chain)
1174 struct nlmsghdr *nlh;
1175 struct nfgenmsg *nfmsg;
1177 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1178 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1180 goto nla_put_failure;
1182 nfmsg = nlmsg_data(nlh);
1183 nfmsg->nfgen_family = family;
1184 nfmsg->version = NFNETLINK_V0;
1185 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1187 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1188 goto nla_put_failure;
1189 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1191 goto nla_put_failure;
1192 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1193 goto nla_put_failure;
1195 if (nft_is_base_chain(chain)) {
1196 const struct nft_base_chain *basechain = nft_base_chain(chain);
1197 const struct nf_hook_ops *ops = &basechain->ops;
1198 struct nlattr *nest;
1200 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
1202 goto nla_put_failure;
1203 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1204 goto nla_put_failure;
1205 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1206 goto nla_put_failure;
1207 if (basechain->dev_name[0] &&
1208 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1209 goto nla_put_failure;
1210 nla_nest_end(skb, nest);
1212 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1213 htonl(basechain->policy)))
1214 goto nla_put_failure;
1216 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1217 goto nla_put_failure;
1219 if (rcu_access_pointer(basechain->stats) &&
1220 nft_dump_stats(skb, rcu_dereference(basechain->stats)))
1221 goto nla_put_failure;
1224 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1225 goto nla_put_failure;
1227 nlmsg_end(skb, nlh);
1231 nlmsg_trim(skb, nlh);
1235 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1237 struct sk_buff *skb;
1241 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1244 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1248 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1249 event, 0, ctx->family, ctx->table,
1256 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1257 ctx->report, GFP_KERNEL);
1260 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1263 static int nf_tables_dump_chains(struct sk_buff *skb,
1264 struct netlink_callback *cb)
1266 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1267 const struct nft_table *table;
1268 const struct nft_chain *chain;
1269 unsigned int idx = 0, s_idx = cb->args[0];
1270 struct net *net = sock_net(skb->sk);
1271 int family = nfmsg->nfgen_family;
1274 cb->seq = net->nft.base_seq;
1276 list_for_each_entry_rcu(table, &net->nft.tables, list) {
1277 if (family != NFPROTO_UNSPEC && family != table->family)
1280 list_for_each_entry_rcu(chain, &table->chains, list) {
1284 memset(&cb->args[1], 0,
1285 sizeof(cb->args) - sizeof(cb->args[0]));
1286 if (!nft_is_active(net, chain))
1288 if (nf_tables_fill_chain_info(skb, net,
1289 NETLINK_CB(cb->skb).portid,
1293 table->family, table,
1297 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1308 /* called with rcu_read_lock held */
1309 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1310 struct sk_buff *skb, const struct nlmsghdr *nlh,
1311 const struct nlattr * const nla[],
1312 struct netlink_ext_ack *extack)
1314 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1315 u8 genmask = nft_genmask_cur(net);
1316 const struct nft_chain *chain;
1317 struct nft_table *table;
1318 struct sk_buff *skb2;
1319 int family = nfmsg->nfgen_family;
1322 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1323 struct netlink_dump_control c = {
1324 .dump = nf_tables_dump_chains,
1325 .module = THIS_MODULE,
1328 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1331 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1332 if (IS_ERR(table)) {
1333 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1334 return PTR_ERR(table);
1337 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1338 if (IS_ERR(chain)) {
1339 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1340 return PTR_ERR(chain);
1343 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1347 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1348 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1349 family, table, chain);
1353 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1360 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1361 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1362 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1365 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1367 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1368 struct nft_stats __percpu *newstats;
1369 struct nft_stats *stats;
1372 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy,
1375 return ERR_PTR(err);
1377 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1378 return ERR_PTR(-EINVAL);
1380 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1381 if (newstats == NULL)
1382 return ERR_PTR(-ENOMEM);
1384 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1385 * are not exposed to userspace.
1388 stats = this_cpu_ptr(newstats);
1389 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1390 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1396 static void nft_chain_stats_replace(struct net *net,
1397 struct nft_base_chain *chain,
1398 struct nft_stats __percpu *newstats)
1400 struct nft_stats __percpu *oldstats;
1402 if (newstats == NULL)
1405 if (rcu_access_pointer(chain->stats)) {
1406 oldstats = rcu_dereference_protected(chain->stats,
1407 lockdep_commit_lock_is_held(net));
1408 rcu_assign_pointer(chain->stats, newstats);
1410 free_percpu(oldstats);
1412 rcu_assign_pointer(chain->stats, newstats);
1413 static_branch_inc(&nft_counters_enabled);
1417 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1419 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1420 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1426 /* should be NULL either via abort or via successful commit */
1427 WARN_ON_ONCE(chain->rules_next);
1428 kvfree(chain->rules_next);
1431 static void nf_tables_chain_destroy(struct nft_ctx *ctx)
1433 struct nft_chain *chain = ctx->chain;
1435 if (WARN_ON(chain->use > 0))
1438 /* no concurrent access possible anymore */
1439 nf_tables_chain_free_chain_rules(chain);
1441 if (nft_is_base_chain(chain)) {
1442 struct nft_base_chain *basechain = nft_base_chain(chain);
1444 module_put(basechain->type->owner);
1445 if (rcu_access_pointer(basechain->stats)) {
1446 static_branch_dec(&nft_counters_enabled);
1447 free_percpu(rcu_dereference_raw(basechain->stats));
1457 struct nft_chain_hook {
1460 const struct nft_chain_type *type;
1461 struct net_device *dev;
1464 static int nft_chain_parse_hook(struct net *net,
1465 const struct nlattr * const nla[],
1466 struct nft_chain_hook *hook, u8 family,
1469 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1470 const struct nft_chain_type *type;
1471 struct net_device *dev;
1474 lockdep_assert_held(&net->nft.commit_mutex);
1475 lockdep_nfnl_nft_mutex_not_held();
1477 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1478 nft_hook_policy, NULL);
1482 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1483 ha[NFTA_HOOK_PRIORITY] == NULL)
1486 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1487 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1489 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1490 if (nla[NFTA_CHAIN_TYPE]) {
1491 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1494 return PTR_ERR(type);
1496 if (!(type->hook_mask & (1 << hook->num)))
1499 if (type->type == NFT_CHAIN_T_NAT &&
1500 hook->priority <= NF_IP_PRI_CONNTRACK)
1503 if (!try_module_get(type->owner))
1509 if (family == NFPROTO_NETDEV) {
1510 char ifname[IFNAMSIZ];
1512 if (!ha[NFTA_HOOK_DEV]) {
1513 module_put(type->owner);
1517 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1518 dev = __dev_get_by_name(net, ifname);
1520 module_put(type->owner);
1524 } else if (ha[NFTA_HOOK_DEV]) {
1525 module_put(type->owner);
1532 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1534 module_put(hook->type->owner);
1537 struct nft_rules_old {
1539 struct nft_rule **start;
1542 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1545 if (alloc > INT_MAX)
1548 alloc += 1; /* NULL, ends rules */
1549 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1552 alloc *= sizeof(struct nft_rule *);
1553 alloc += sizeof(struct nft_rules_old);
1555 return kvmalloc(alloc, GFP_KERNEL);
1558 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1561 const struct nlattr * const *nla = ctx->nla;
1562 struct nft_table *table = ctx->table;
1563 struct nft_base_chain *basechain;
1564 struct nft_stats __percpu *stats;
1565 struct net *net = ctx->net;
1566 struct nft_chain *chain;
1567 struct nft_rule **rules;
1570 if (table->use == UINT_MAX)
1573 if (nla[NFTA_CHAIN_HOOK]) {
1574 struct nft_chain_hook hook;
1575 struct nf_hook_ops *ops;
1577 err = nft_chain_parse_hook(net, nla, &hook, family, true);
1581 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1582 if (basechain == NULL) {
1583 nft_chain_release_hook(&hook);
1587 if (hook.dev != NULL)
1588 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1590 if (nla[NFTA_CHAIN_COUNTERS]) {
1591 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1592 if (IS_ERR(stats)) {
1593 nft_chain_release_hook(&hook);
1595 return PTR_ERR(stats);
1597 rcu_assign_pointer(basechain->stats, stats);
1598 static_branch_inc(&nft_counters_enabled);
1601 basechain->type = hook.type;
1602 chain = &basechain->chain;
1604 ops = &basechain->ops;
1606 ops->hooknum = hook.num;
1607 ops->priority = hook.priority;
1609 ops->hook = hook.type->hooks[ops->hooknum];
1610 ops->dev = hook.dev;
1612 chain->flags |= NFT_BASE_CHAIN;
1613 basechain->policy = policy;
1615 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1621 INIT_LIST_HEAD(&chain->rules);
1622 chain->handle = nf_tables_alloc_handle(table);
1623 chain->table = table;
1624 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1630 rules = nf_tables_chain_alloc_rules(chain, 0);
1637 rcu_assign_pointer(chain->rules_gen_0, rules);
1638 rcu_assign_pointer(chain->rules_gen_1, rules);
1640 err = nf_tables_register_hook(net, table, chain);
1644 err = rhltable_insert_key(&table->chains_ht, chain->name,
1645 &chain->rhlhead, nft_chain_ht_params);
1649 err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1651 rhltable_remove(&table->chains_ht, &chain->rhlhead,
1652 nft_chain_ht_params);
1657 list_add_tail_rcu(&chain->list, &table->chains);
1661 nf_tables_unregister_hook(net, table, chain);
1663 nf_tables_chain_destroy(ctx);
1668 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy)
1670 const struct nlattr * const *nla = ctx->nla;
1671 struct nft_table *table = ctx->table;
1672 struct nft_chain *chain = ctx->chain;
1673 struct nft_base_chain *basechain;
1674 struct nft_stats *stats = NULL;
1675 struct nft_chain_hook hook;
1676 struct nf_hook_ops *ops;
1677 struct nft_trans *trans;
1680 if (nla[NFTA_CHAIN_HOOK]) {
1681 if (!nft_is_base_chain(chain))
1684 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
1689 basechain = nft_base_chain(chain);
1690 if (basechain->type != hook.type) {
1691 nft_chain_release_hook(&hook);
1695 ops = &basechain->ops;
1696 if (ops->hooknum != hook.num ||
1697 ops->priority != hook.priority ||
1698 ops->dev != hook.dev) {
1699 nft_chain_release_hook(&hook);
1702 nft_chain_release_hook(&hook);
1705 if (nla[NFTA_CHAIN_HANDLE] &&
1706 nla[NFTA_CHAIN_NAME]) {
1707 struct nft_chain *chain2;
1709 chain2 = nft_chain_lookup(ctx->net, table,
1710 nla[NFTA_CHAIN_NAME], genmask);
1711 if (!IS_ERR(chain2))
1715 if (nla[NFTA_CHAIN_COUNTERS]) {
1716 if (!nft_is_base_chain(chain))
1719 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1721 return PTR_ERR(stats);
1725 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
1726 sizeof(struct nft_trans_chain));
1730 nft_trans_chain_stats(trans) = stats;
1731 nft_trans_chain_update(trans) = true;
1733 if (nla[NFTA_CHAIN_POLICY])
1734 nft_trans_chain_policy(trans) = policy;
1736 nft_trans_chain_policy(trans) = -1;
1738 if (nla[NFTA_CHAIN_HANDLE] &&
1739 nla[NFTA_CHAIN_NAME]) {
1740 struct nft_trans *tmp;
1744 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1749 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
1750 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
1751 tmp->ctx.table == table &&
1752 nft_trans_chain_update(tmp) &&
1753 nft_trans_chain_name(tmp) &&
1754 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
1760 nft_trans_chain_name(trans) = name;
1762 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1771 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1772 struct sk_buff *skb, const struct nlmsghdr *nlh,
1773 const struct nlattr * const nla[],
1774 struct netlink_ext_ack *extack)
1776 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1777 u8 genmask = nft_genmask_next(net);
1778 int family = nfmsg->nfgen_family;
1779 const struct nlattr *attr;
1780 struct nft_table *table;
1781 struct nft_chain *chain;
1782 u8 policy = NF_ACCEPT;
1786 lockdep_assert_held(&net->nft.commit_mutex);
1788 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1789 if (IS_ERR(table)) {
1790 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1791 return PTR_ERR(table);
1795 attr = nla[NFTA_CHAIN_NAME];
1797 if (nla[NFTA_CHAIN_HANDLE]) {
1798 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1799 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1800 if (IS_ERR(chain)) {
1801 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
1802 return PTR_ERR(chain);
1804 attr = nla[NFTA_CHAIN_HANDLE];
1806 chain = nft_chain_lookup(net, table, attr, genmask);
1807 if (IS_ERR(chain)) {
1808 if (PTR_ERR(chain) != -ENOENT) {
1809 NL_SET_BAD_ATTR(extack, attr);
1810 return PTR_ERR(chain);
1816 if (nla[NFTA_CHAIN_POLICY]) {
1817 if (chain != NULL &&
1818 !nft_is_base_chain(chain)) {
1819 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1823 if (chain == NULL &&
1824 nla[NFTA_CHAIN_HOOK] == NULL) {
1825 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1829 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1839 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1841 if (chain != NULL) {
1842 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1843 NL_SET_BAD_ATTR(extack, attr);
1846 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1849 return nf_tables_updchain(&ctx, genmask, policy);
1852 return nf_tables_addchain(&ctx, family, genmask, policy);
1855 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1856 struct sk_buff *skb, const struct nlmsghdr *nlh,
1857 const struct nlattr * const nla[],
1858 struct netlink_ext_ack *extack)
1860 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1861 u8 genmask = nft_genmask_next(net);
1862 int family = nfmsg->nfgen_family;
1863 const struct nlattr *attr;
1864 struct nft_table *table;
1865 struct nft_chain *chain;
1866 struct nft_rule *rule;
1872 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1873 if (IS_ERR(table)) {
1874 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1875 return PTR_ERR(table);
1878 if (nla[NFTA_CHAIN_HANDLE]) {
1879 attr = nla[NFTA_CHAIN_HANDLE];
1880 handle = be64_to_cpu(nla_get_be64(attr));
1881 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1883 attr = nla[NFTA_CHAIN_NAME];
1884 chain = nft_chain_lookup(net, table, attr, genmask);
1886 if (IS_ERR(chain)) {
1887 NL_SET_BAD_ATTR(extack, attr);
1888 return PTR_ERR(chain);
1891 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1895 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1898 list_for_each_entry(rule, &chain->rules, list) {
1899 if (!nft_is_active_next(net, rule))
1903 err = nft_delrule(&ctx, rule);
1908 /* There are rules and elements that are still holding references to us,
1909 * we cannot do a recursive removal in this case.
1912 NL_SET_BAD_ATTR(extack, attr);
1916 return nft_delchain(&ctx);
1924 * nft_register_expr - register nf_tables expr type
1927 * Registers the expr type for use with nf_tables. Returns zero on
1928 * success or a negative errno code otherwise.
1930 int nft_register_expr(struct nft_expr_type *type)
1932 if (!nft_expr_check_ops(type->ops))
1935 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1936 if (type->family == NFPROTO_UNSPEC)
1937 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1939 list_add_rcu(&type->list, &nf_tables_expressions);
1940 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1943 EXPORT_SYMBOL_GPL(nft_register_expr);
1946 * nft_unregister_expr - unregister nf_tables expr type
1949 * Unregisters the expr typefor use with nf_tables.
1951 void nft_unregister_expr(struct nft_expr_type *type)
1953 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1954 list_del_rcu(&type->list);
1955 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1957 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1959 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1962 const struct nft_expr_type *type;
1964 list_for_each_entry(type, &nf_tables_expressions, list) {
1965 if (!nla_strcmp(nla, type->name) &&
1966 (!type->family || type->family == family))
1972 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
1976 const struct nft_expr_type *type;
1979 return ERR_PTR(-EINVAL);
1981 type = __nft_expr_type_get(family, nla);
1982 if (type != NULL && try_module_get(type->owner))
1985 lockdep_nfnl_nft_mutex_not_held();
1986 #ifdef CONFIG_MODULES
1988 nft_request_module(net, "nft-expr-%u-%.*s", family,
1989 nla_len(nla), (char *)nla_data(nla));
1990 if (__nft_expr_type_get(family, nla))
1991 return ERR_PTR(-EAGAIN);
1993 nft_request_module(net, "nft-expr-%.*s",
1994 nla_len(nla), (char *)nla_data(nla));
1995 if (__nft_expr_type_get(family, nla))
1996 return ERR_PTR(-EAGAIN);
1999 return ERR_PTR(-ENOENT);
2002 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2003 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
2004 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2007 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2008 const struct nft_expr *expr)
2010 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2011 goto nla_put_failure;
2013 if (expr->ops->dump) {
2014 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
2016 goto nla_put_failure;
2017 if (expr->ops->dump(skb, expr) < 0)
2018 goto nla_put_failure;
2019 nla_nest_end(skb, data);
2028 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2029 const struct nft_expr *expr)
2031 struct nlattr *nest;
2033 nest = nla_nest_start(skb, attr);
2035 goto nla_put_failure;
2036 if (nf_tables_fill_expr_info(skb, expr) < 0)
2037 goto nla_put_failure;
2038 nla_nest_end(skb, nest);
2045 struct nft_expr_info {
2046 const struct nft_expr_ops *ops;
2047 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2050 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2051 const struct nlattr *nla,
2052 struct nft_expr_info *info)
2054 const struct nft_expr_type *type;
2055 const struct nft_expr_ops *ops;
2056 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2059 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL);
2063 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2065 return PTR_ERR(type);
2067 if (tb[NFTA_EXPR_DATA]) {
2068 err = nla_parse_nested(info->tb, type->maxattr,
2069 tb[NFTA_EXPR_DATA], type->policy, NULL);
2073 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2075 if (type->select_ops != NULL) {
2076 ops = type->select_ops(ctx,
2077 (const struct nlattr * const *)info->tb);
2082 if (!nft_expr_check_ops(ops)) {
2093 module_put(type->owner);
2097 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2098 const struct nft_expr_info *info,
2099 struct nft_expr *expr)
2101 const struct nft_expr_ops *ops = info->ops;
2106 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2117 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2118 struct nft_expr *expr)
2120 if (expr->ops->destroy)
2121 expr->ops->destroy(ctx, expr);
2122 module_put(expr->ops->type->owner);
2125 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2126 const struct nlattr *nla)
2128 struct nft_expr_info info;
2129 struct nft_expr *expr;
2132 err = nf_tables_expr_parse(ctx, nla, &info);
2137 expr = kzalloc(info.ops->size, GFP_KERNEL);
2141 err = nf_tables_newexpr(ctx, &info, expr);
2149 module_put(info.ops->type->owner);
2151 return ERR_PTR(err);
2154 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2156 nf_tables_expr_destroy(ctx, expr);
2164 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2167 struct nft_rule *rule;
2169 // FIXME: this sucks
2170 list_for_each_entry_rcu(rule, &chain->rules, list) {
2171 if (handle == rule->handle)
2175 return ERR_PTR(-ENOENT);
2178 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2179 const struct nlattr *nla)
2182 return ERR_PTR(-EINVAL);
2184 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2187 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2188 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2189 .len = NFT_TABLE_MAXNAMELEN - 1 },
2190 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2191 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2192 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2193 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2194 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2195 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2196 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2197 .len = NFT_USERDATA_MAXLEN },
2198 [NFTA_RULE_ID] = { .type = NLA_U32 },
2201 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2202 u32 portid, u32 seq, int event,
2203 u32 flags, int family,
2204 const struct nft_table *table,
2205 const struct nft_chain *chain,
2206 const struct nft_rule *rule)
2208 struct nlmsghdr *nlh;
2209 struct nfgenmsg *nfmsg;
2210 const struct nft_expr *expr, *next;
2211 struct nlattr *list;
2212 const struct nft_rule *prule;
2213 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2215 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2217 goto nla_put_failure;
2219 nfmsg = nlmsg_data(nlh);
2220 nfmsg->nfgen_family = family;
2221 nfmsg->version = NFNETLINK_V0;
2222 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
2224 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2225 goto nla_put_failure;
2226 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2227 goto nla_put_failure;
2228 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2230 goto nla_put_failure;
2232 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
2233 prule = list_prev_entry(rule, list);
2234 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2235 cpu_to_be64(prule->handle),
2237 goto nla_put_failure;
2240 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
2242 goto nla_put_failure;
2243 nft_rule_for_each_expr(expr, next, rule) {
2244 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2245 goto nla_put_failure;
2247 nla_nest_end(skb, list);
2250 struct nft_userdata *udata = nft_userdata(rule);
2251 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2253 goto nla_put_failure;
2256 nlmsg_end(skb, nlh);
2260 nlmsg_trim(skb, nlh);
2264 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2265 const struct nft_rule *rule, int event)
2267 struct sk_buff *skb;
2271 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2274 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2278 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2279 event, 0, ctx->family, ctx->table,
2286 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2287 ctx->report, GFP_KERNEL);
2290 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2293 struct nft_rule_dump_ctx {
2298 static int nf_tables_dump_rules(struct sk_buff *skb,
2299 struct netlink_callback *cb)
2301 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2302 const struct nft_rule_dump_ctx *ctx = cb->data;
2303 const struct nft_table *table;
2304 const struct nft_chain *chain;
2305 const struct nft_rule *rule;
2306 unsigned int idx = 0, s_idx = cb->args[0];
2307 struct net *net = sock_net(skb->sk);
2308 int family = nfmsg->nfgen_family;
2311 cb->seq = net->nft.base_seq;
2313 list_for_each_entry_rcu(table, &net->nft.tables, list) {
2314 if (family != NFPROTO_UNSPEC && family != table->family)
2317 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2320 list_for_each_entry_rcu(chain, &table->chains, list) {
2321 if (ctx && ctx->chain &&
2322 strcmp(ctx->chain, chain->name) != 0)
2325 list_for_each_entry_rcu(rule, &chain->rules, list) {
2326 if (!nft_is_active(net, rule))
2331 memset(&cb->args[1], 0,
2332 sizeof(cb->args) - sizeof(cb->args[0]));
2333 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2336 NLM_F_MULTI | NLM_F_APPEND,
2338 table, chain, rule) < 0)
2341 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2354 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2356 const struct nlattr * const *nla = cb->data;
2357 struct nft_rule_dump_ctx *ctx = NULL;
2359 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2360 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2364 if (nla[NFTA_RULE_TABLE]) {
2365 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2372 if (nla[NFTA_RULE_CHAIN]) {
2373 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2387 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2389 struct nft_rule_dump_ctx *ctx = cb->data;
2399 /* called with rcu_read_lock held */
2400 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2401 struct sk_buff *skb, const struct nlmsghdr *nlh,
2402 const struct nlattr * const nla[],
2403 struct netlink_ext_ack *extack)
2405 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2406 u8 genmask = nft_genmask_cur(net);
2407 const struct nft_chain *chain;
2408 const struct nft_rule *rule;
2409 struct nft_table *table;
2410 struct sk_buff *skb2;
2411 int family = nfmsg->nfgen_family;
2414 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2415 struct netlink_dump_control c = {
2416 .start= nf_tables_dump_rules_start,
2417 .dump = nf_tables_dump_rules,
2418 .done = nf_tables_dump_rules_done,
2419 .module = THIS_MODULE,
2420 .data = (void *)nla,
2423 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
2426 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2427 if (IS_ERR(table)) {
2428 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2429 return PTR_ERR(table);
2432 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2433 if (IS_ERR(chain)) {
2434 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2435 return PTR_ERR(chain);
2438 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2440 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2441 return PTR_ERR(rule);
2444 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
2448 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2449 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2450 family, table, chain, rule);
2454 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2461 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2462 struct nft_rule *rule)
2464 struct nft_expr *expr, *next;
2467 * Careful: some expressions might not be initialized in case this
2468 * is called on error from nf_tables_newrule().
2470 expr = nft_expr_first(rule);
2471 while (expr != nft_expr_last(rule) && expr->ops) {
2472 next = nft_expr_next(expr);
2473 nf_tables_expr_destroy(ctx, expr);
2479 static void nf_tables_rule_release(const struct nft_ctx *ctx,
2480 struct nft_rule *rule)
2482 nft_rule_expr_deactivate(ctx, rule);
2483 nf_tables_rule_destroy(ctx, rule);
2486 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
2488 struct nft_expr *expr, *last;
2489 const struct nft_data *data;
2490 struct nft_rule *rule;
2493 if (ctx->level == NFT_JUMP_STACK_SIZE)
2496 list_for_each_entry(rule, &chain->rules, list) {
2497 if (!nft_is_active_next(ctx->net, rule))
2500 nft_rule_for_each_expr(expr, last, rule) {
2501 if (!expr->ops->validate)
2504 err = expr->ops->validate(ctx, expr, &data);
2512 EXPORT_SYMBOL_GPL(nft_chain_validate);
2514 static int nft_table_validate(struct net *net, const struct nft_table *table)
2516 struct nft_chain *chain;
2517 struct nft_ctx ctx = {
2519 .family = table->family,
2523 list_for_each_entry(chain, &table->chains, list) {
2524 if (!nft_is_base_chain(chain))
2528 err = nft_chain_validate(&ctx, chain);
2536 #define NFT_RULE_MAXEXPRS 128
2538 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2539 struct sk_buff *skb, const struct nlmsghdr *nlh,
2540 const struct nlattr * const nla[],
2541 struct netlink_ext_ack *extack)
2543 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2544 u8 genmask = nft_genmask_next(net);
2545 struct nft_expr_info *info = NULL;
2546 int family = nfmsg->nfgen_family;
2547 struct nft_table *table;
2548 struct nft_chain *chain;
2549 struct nft_rule *rule, *old_rule = NULL;
2550 struct nft_userdata *udata;
2551 struct nft_trans *trans = NULL;
2552 struct nft_expr *expr;
2555 unsigned int size, i, n, ulen = 0, usize = 0;
2557 u64 handle, pos_handle;
2559 lockdep_assert_held(&net->nft.commit_mutex);
2561 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2562 if (IS_ERR(table)) {
2563 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2564 return PTR_ERR(table);
2567 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2568 if (IS_ERR(chain)) {
2569 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2570 return PTR_ERR(chain);
2573 if (nla[NFTA_RULE_HANDLE]) {
2574 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2575 rule = __nft_rule_lookup(chain, handle);
2577 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2578 return PTR_ERR(rule);
2581 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2582 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2585 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2590 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
2591 nlh->nlmsg_flags & NLM_F_REPLACE)
2593 handle = nf_tables_alloc_handle(table);
2595 if (chain->use == UINT_MAX)
2598 if (nla[NFTA_RULE_POSITION]) {
2599 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2600 old_rule = __nft_rule_lookup(chain, pos_handle);
2601 if (IS_ERR(old_rule)) {
2602 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
2603 return PTR_ERR(old_rule);
2608 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2612 if (nla[NFTA_RULE_EXPRESSIONS]) {
2613 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
2614 sizeof(struct nft_expr_info),
2619 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2621 if (nla_type(tmp) != NFTA_LIST_ELEM)
2623 if (n == NFT_RULE_MAXEXPRS)
2625 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2628 size += info[n].ops->size;
2632 /* Check for overflow of dlen field */
2634 if (size >= 1 << 12)
2637 if (nla[NFTA_RULE_USERDATA]) {
2638 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2640 usize = sizeof(struct nft_userdata) + ulen;
2644 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2648 nft_activate_next(net, rule);
2650 rule->handle = handle;
2652 rule->udata = ulen ? 1 : 0;
2655 udata = nft_userdata(rule);
2656 udata->len = ulen - 1;
2657 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2660 expr = nft_expr_first(rule);
2661 for (i = 0; i < n; i++) {
2662 err = nf_tables_newexpr(&ctx, &info[i], expr);
2666 if (info[i].ops->validate)
2667 nft_validate_state_update(net, NFT_VALIDATE_NEED);
2670 expr = nft_expr_next(expr);
2673 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2674 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
2675 if (trans == NULL) {
2679 err = nft_delrule(&ctx, old_rule);
2681 nft_trans_destroy(trans);
2685 list_add_tail_rcu(&rule->list, &old_rule->list);
2687 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2692 if (nlh->nlmsg_flags & NLM_F_APPEND) {
2694 list_add_rcu(&rule->list, &old_rule->list);
2696 list_add_tail_rcu(&rule->list, &chain->rules);
2699 list_add_tail_rcu(&rule->list, &old_rule->list);
2701 list_add_rcu(&rule->list, &chain->rules);
2707 if (net->nft.validate_state == NFT_VALIDATE_DO)
2708 return nft_table_validate(net, table);
2712 nf_tables_rule_release(&ctx, rule);
2714 for (i = 0; i < n; i++) {
2715 if (info[i].ops != NULL)
2716 module_put(info[i].ops->type->owner);
2722 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2723 const struct nlattr *nla)
2725 u32 id = ntohl(nla_get_be32(nla));
2726 struct nft_trans *trans;
2728 list_for_each_entry(trans, &net->nft.commit_list, list) {
2729 struct nft_rule *rule = nft_trans_rule(trans);
2731 if (trans->msg_type == NFT_MSG_NEWRULE &&
2732 id == nft_trans_rule_id(trans))
2735 return ERR_PTR(-ENOENT);
2738 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2739 struct sk_buff *skb, const struct nlmsghdr *nlh,
2740 const struct nlattr * const nla[],
2741 struct netlink_ext_ack *extack)
2743 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2744 u8 genmask = nft_genmask_next(net);
2745 struct nft_table *table;
2746 struct nft_chain *chain = NULL;
2747 struct nft_rule *rule;
2748 int family = nfmsg->nfgen_family, err = 0;
2751 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2752 if (IS_ERR(table)) {
2753 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2754 return PTR_ERR(table);
2757 if (nla[NFTA_RULE_CHAIN]) {
2758 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
2760 if (IS_ERR(chain)) {
2761 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2762 return PTR_ERR(chain);
2766 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2769 if (nla[NFTA_RULE_HANDLE]) {
2770 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2772 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2773 return PTR_ERR(rule);
2776 err = nft_delrule(&ctx, rule);
2777 } else if (nla[NFTA_RULE_ID]) {
2778 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2780 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
2781 return PTR_ERR(rule);
2784 err = nft_delrule(&ctx, rule);
2786 err = nft_delrule_by_chain(&ctx);
2789 list_for_each_entry(chain, &table->chains, list) {
2790 if (!nft_is_active_next(net, chain))
2794 err = nft_delrule_by_chain(&ctx);
2807 static LIST_HEAD(nf_tables_set_types);
2809 int nft_register_set(struct nft_set_type *type)
2811 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2812 list_add_tail_rcu(&type->list, &nf_tables_set_types);
2813 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2816 EXPORT_SYMBOL_GPL(nft_register_set);
2818 void nft_unregister_set(struct nft_set_type *type)
2820 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2821 list_del_rcu(&type->list);
2822 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2824 EXPORT_SYMBOL_GPL(nft_unregister_set);
2826 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
2827 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
2830 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
2832 return (flags & type->features) == (flags & NFT_SET_FEATURES);
2836 * Select a set implementation based on the data characteristics and the
2837 * given policy. The total memory use might not be known if no size is
2838 * given, in that case the amount of memory per element is used.
2840 static const struct nft_set_ops *
2841 nft_select_set_ops(const struct nft_ctx *ctx,
2842 const struct nlattr * const nla[],
2843 const struct nft_set_desc *desc,
2844 enum nft_set_policies policy)
2846 const struct nft_set_ops *ops, *bops;
2847 struct nft_set_estimate est, best;
2848 const struct nft_set_type *type;
2851 lockdep_assert_held(&ctx->net->nft.commit_mutex);
2852 lockdep_nfnl_nft_mutex_not_held();
2853 #ifdef CONFIG_MODULES
2854 if (list_empty(&nf_tables_set_types)) {
2855 nft_request_module(ctx->net, "nft-set");
2856 if (!list_empty(&nf_tables_set_types))
2857 return ERR_PTR(-EAGAIN);
2860 if (nla[NFTA_SET_FLAGS] != NULL)
2861 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2868 list_for_each_entry(type, &nf_tables_set_types, list) {
2871 if (!nft_set_ops_candidate(type, flags))
2873 if (!ops->estimate(desc, flags, &est))
2877 case NFT_SET_POL_PERFORMANCE:
2878 if (est.lookup < best.lookup)
2880 if (est.lookup == best.lookup &&
2881 est.space < best.space)
2884 case NFT_SET_POL_MEMORY:
2886 if (est.space < best.space)
2888 if (est.space == best.space &&
2889 est.lookup < best.lookup)
2891 } else if (est.size < best.size || !bops) {
2899 if (!try_module_get(type->owner))
2902 module_put(to_set_type(bops)->owner);
2911 return ERR_PTR(-EOPNOTSUPP);
2914 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2915 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2916 .len = NFT_TABLE_MAXNAMELEN - 1 },
2917 [NFTA_SET_NAME] = { .type = NLA_STRING,
2918 .len = NFT_SET_MAXNAMELEN - 1 },
2919 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2920 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2921 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2922 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2923 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2924 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2925 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2926 [NFTA_SET_ID] = { .type = NLA_U32 },
2927 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2928 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2929 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2930 .len = NFT_USERDATA_MAXLEN },
2931 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
2932 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
2935 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2936 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2939 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2940 const struct sk_buff *skb,
2941 const struct nlmsghdr *nlh,
2942 const struct nlattr * const nla[],
2943 struct netlink_ext_ack *extack,
2946 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2947 int family = nfmsg->nfgen_family;
2948 struct nft_table *table = NULL;
2950 if (nla[NFTA_SET_TABLE] != NULL) {
2951 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
2953 if (IS_ERR(table)) {
2954 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
2955 return PTR_ERR(table);
2959 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
2963 static struct nft_set *nft_set_lookup(const struct nft_table *table,
2964 const struct nlattr *nla, u8 genmask)
2966 struct nft_set *set;
2969 return ERR_PTR(-EINVAL);
2971 list_for_each_entry_rcu(set, &table->sets, list) {
2972 if (!nla_strcmp(nla, set->name) &&
2973 nft_active_genmask(set, genmask))
2976 return ERR_PTR(-ENOENT);
2979 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
2980 const struct nlattr *nla,
2983 struct nft_set *set;
2985 list_for_each_entry(set, &table->sets, list) {
2986 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
2987 nft_active_genmask(set, genmask))
2990 return ERR_PTR(-ENOENT);
2993 static struct nft_set *nft_set_lookup_byid(const struct net *net,
2994 const struct nlattr *nla, u8 genmask)
2996 struct nft_trans *trans;
2997 u32 id = ntohl(nla_get_be32(nla));
2999 list_for_each_entry(trans, &net->nft.commit_list, list) {
3000 if (trans->msg_type == NFT_MSG_NEWSET) {
3001 struct nft_set *set = nft_trans_set(trans);
3003 if (id == nft_trans_set_id(trans) &&
3004 nft_active_genmask(set, genmask))
3008 return ERR_PTR(-ENOENT);
3011 struct nft_set *nft_set_lookup_global(const struct net *net,
3012 const struct nft_table *table,
3013 const struct nlattr *nla_set_name,
3014 const struct nlattr *nla_set_id,
3017 struct nft_set *set;
3019 set = nft_set_lookup(table, nla_set_name, genmask);
3024 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3028 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3030 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3033 const struct nft_set *i;
3035 unsigned long *inuse;
3036 unsigned int n = 0, min = 0;
3038 p = strchr(name, '%');
3040 if (p[1] != 'd' || strchr(p + 2, '%'))
3043 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3047 list_for_each_entry(i, &ctx->table->sets, list) {
3050 if (!nft_is_active_next(ctx->net, set))
3052 if (!sscanf(i->name, name, &tmp))
3054 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3057 set_bit(tmp - min, inuse);
3060 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3061 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3062 min += BITS_PER_BYTE * PAGE_SIZE;
3063 memset(inuse, 0, PAGE_SIZE);
3066 free_page((unsigned long)inuse);
3069 set->name = kasprintf(GFP_KERNEL, name, min + n);
3073 list_for_each_entry(i, &ctx->table->sets, list) {
3074 if (!nft_is_active_next(ctx->net, i))
3076 if (!strcmp(set->name, i->name)) {
3084 static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3086 u64 ms = be64_to_cpu(nla_get_be64(nla));
3087 u64 max = (u64)(~((u64)0));
3089 max = div_u64(max, NSEC_PER_MSEC);
3093 ms *= NSEC_PER_MSEC;
3094 *result = nsecs_to_jiffies64(ms);
3098 static __be64 nf_jiffies64_to_msecs(u64 input)
3100 u64 ms = jiffies64_to_nsecs(input);
3102 return cpu_to_be64(div_u64(ms, NSEC_PER_MSEC));
3105 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3106 const struct nft_set *set, u16 event, u16 flags)
3108 struct nfgenmsg *nfmsg;
3109 struct nlmsghdr *nlh;
3110 struct nlattr *desc;
3111 u32 portid = ctx->portid;
3114 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3115 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3118 goto nla_put_failure;
3120 nfmsg = nlmsg_data(nlh);
3121 nfmsg->nfgen_family = ctx->family;
3122 nfmsg->version = NFNETLINK_V0;
3123 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3125 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3126 goto nla_put_failure;
3127 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3128 goto nla_put_failure;
3129 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3131 goto nla_put_failure;
3132 if (set->flags != 0)
3133 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3134 goto nla_put_failure;
3136 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3137 goto nla_put_failure;
3138 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3139 goto nla_put_failure;
3140 if (set->flags & NFT_SET_MAP) {
3141 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3142 goto nla_put_failure;
3143 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3144 goto nla_put_failure;
3146 if (set->flags & NFT_SET_OBJECT &&
3147 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3148 goto nla_put_failure;
3151 nla_put_be64(skb, NFTA_SET_TIMEOUT,
3152 nf_jiffies64_to_msecs(set->timeout),
3154 goto nla_put_failure;
3156 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3157 goto nla_put_failure;
3159 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3160 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3161 goto nla_put_failure;
3164 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3165 goto nla_put_failure;
3167 desc = nla_nest_start(skb, NFTA_SET_DESC);
3169 goto nla_put_failure;
3171 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3172 goto nla_put_failure;
3173 nla_nest_end(skb, desc);
3175 nlmsg_end(skb, nlh);
3179 nlmsg_trim(skb, nlh);
3183 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3184 const struct nft_set *set, int event,
3187 struct sk_buff *skb;
3188 u32 portid = ctx->portid;
3192 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3195 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3199 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3205 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
3209 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3212 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3214 const struct nft_set *set;
3215 unsigned int idx, s_idx = cb->args[0];
3216 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3217 struct net *net = sock_net(skb->sk);
3218 struct nft_ctx *ctx = cb->data, ctx_set;
3224 cb->seq = net->nft.base_seq;
3226 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3227 if (ctx->family != NFPROTO_UNSPEC &&
3228 ctx->family != table->family)
3231 if (ctx->table && ctx->table != table)
3235 if (cur_table != table)
3241 list_for_each_entry_rcu(set, &table->sets, list) {
3244 if (!nft_is_active(net, set))
3248 ctx_set.table = table;
3249 ctx_set.family = table->family;
3251 if (nf_tables_fill_set(skb, &ctx_set, set,
3255 cb->args[2] = (unsigned long) table;
3258 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3271 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3273 struct nft_ctx *ctx_dump = NULL;
3275 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3276 if (ctx_dump == NULL)
3279 cb->data = ctx_dump;
3283 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3289 /* called with rcu_read_lock held */
3290 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3291 struct sk_buff *skb, const struct nlmsghdr *nlh,
3292 const struct nlattr * const nla[],
3293 struct netlink_ext_ack *extack)
3295 u8 genmask = nft_genmask_cur(net);
3296 const struct nft_set *set;
3298 struct sk_buff *skb2;
3299 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3302 /* Verify existence before starting dump */
3303 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3308 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3309 struct netlink_dump_control c = {
3310 .start = nf_tables_dump_sets_start,
3311 .dump = nf_tables_dump_sets,
3312 .done = nf_tables_dump_sets_done,
3314 .module = THIS_MODULE,
3317 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3320 /* Only accept unspec with dump */
3321 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3322 return -EAFNOSUPPORT;
3323 if (!nla[NFTA_SET_TABLE])
3326 set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3328 return PTR_ERR(set);
3330 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3334 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3338 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3345 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
3346 struct nft_set_desc *desc,
3347 const struct nlattr *nla)
3349 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
3352 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
3353 nft_set_desc_policy, NULL);
3357 if (da[NFTA_SET_DESC_SIZE] != NULL)
3358 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
3363 static int nf_tables_newset(struct net *net, struct sock *nlsk,
3364 struct sk_buff *skb, const struct nlmsghdr *nlh,
3365 const struct nlattr * const nla[],
3366 struct netlink_ext_ack *extack)
3368 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3369 u8 genmask = nft_genmask_next(net);
3370 int family = nfmsg->nfgen_family;
3371 const struct nft_set_ops *ops;
3372 struct nft_table *table;
3373 struct nft_set *set;
3378 u32 ktype, dtype, flags, policy, gc_int, objtype;
3379 struct nft_set_desc desc;
3380 unsigned char *udata;
3384 if (nla[NFTA_SET_TABLE] == NULL ||
3385 nla[NFTA_SET_NAME] == NULL ||
3386 nla[NFTA_SET_KEY_LEN] == NULL ||
3387 nla[NFTA_SET_ID] == NULL)
3390 memset(&desc, 0, sizeof(desc));
3392 ktype = NFT_DATA_VALUE;
3393 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3394 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3395 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3399 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
3400 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
3404 if (nla[NFTA_SET_FLAGS] != NULL) {
3405 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3406 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
3407 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
3408 NFT_SET_MAP | NFT_SET_EVAL |
3411 /* Only one of these operations is supported */
3412 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3413 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
3418 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3419 if (!(flags & NFT_SET_MAP))
3422 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3423 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3424 dtype != NFT_DATA_VERDICT)
3427 if (dtype != NFT_DATA_VERDICT) {
3428 if (nla[NFTA_SET_DATA_LEN] == NULL)
3430 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
3431 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
3434 desc.dlen = sizeof(struct nft_verdict);
3435 } else if (flags & NFT_SET_MAP)
3438 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3439 if (!(flags & NFT_SET_OBJECT))
3442 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3443 if (objtype == NFT_OBJECT_UNSPEC ||
3444 objtype > NFT_OBJECT_MAX)
3446 } else if (flags & NFT_SET_OBJECT)
3449 objtype = NFT_OBJECT_UNSPEC;
3452 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3453 if (!(flags & NFT_SET_TIMEOUT))
3456 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
3461 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3462 if (!(flags & NFT_SET_TIMEOUT))
3464 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3467 policy = NFT_SET_POL_PERFORMANCE;
3468 if (nla[NFTA_SET_POLICY] != NULL)
3469 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3471 if (nla[NFTA_SET_DESC] != NULL) {
3472 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
3477 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
3478 if (IS_ERR(table)) {
3479 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3480 return PTR_ERR(table);
3483 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
3485 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
3487 if (PTR_ERR(set) != -ENOENT) {
3488 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3489 return PTR_ERR(set);
3492 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3493 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3496 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3502 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3505 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
3507 return PTR_ERR(ops);
3510 if (nla[NFTA_SET_USERDATA])
3511 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3514 if (ops->privsize != NULL)
3515 size = ops->privsize(nla, &desc);
3517 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3523 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3529 err = nf_tables_set_alloc_name(&ctx, set, name);
3536 udata = set->data + size;
3537 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3540 INIT_LIST_HEAD(&set->bindings);
3542 write_pnet(&set->net, net);
3545 set->klen = desc.klen;
3547 set->objtype = objtype;
3548 set->dlen = desc.dlen;
3550 set->size = desc.size;
3551 set->policy = policy;
3554 set->timeout = timeout;
3555 set->gc_int = gc_int;
3556 set->handle = nf_tables_alloc_handle(table);
3558 err = ops->init(set, &desc, nla);
3562 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3566 list_add_tail_rcu(&set->list, &table->sets);
3577 module_put(to_set_type(ops)->owner);
3581 static void nft_set_destroy(struct nft_set *set)
3583 set->ops->destroy(set);
3584 module_put(to_set_type(set->ops)->owner);
3589 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3590 struct sk_buff *skb, const struct nlmsghdr *nlh,
3591 const struct nlattr * const nla[],
3592 struct netlink_ext_ack *extack)
3594 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3595 u8 genmask = nft_genmask_next(net);
3596 const struct nlattr *attr;
3597 struct nft_set *set;
3601 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3602 return -EAFNOSUPPORT;
3603 if (nla[NFTA_SET_TABLE] == NULL)
3606 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3611 if (nla[NFTA_SET_HANDLE]) {
3612 attr = nla[NFTA_SET_HANDLE];
3613 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
3615 attr = nla[NFTA_SET_NAME];
3616 set = nft_set_lookup(ctx.table, attr, genmask);
3620 NL_SET_BAD_ATTR(extack, attr);
3621 return PTR_ERR(set);
3623 if (!list_empty(&set->bindings) ||
3624 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
3625 NL_SET_BAD_ATTR(extack, attr);
3629 return nft_delset(&ctx, set);
3632 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3633 struct nft_set *set,
3634 const struct nft_set_iter *iter,
3635 struct nft_set_elem *elem)
3637 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3638 enum nft_registers dreg;
3640 dreg = nft_type_to_reg(set->dtype);
3641 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3642 set->dtype == NFT_DATA_VERDICT ?
3643 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3647 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3648 struct nft_set_binding *binding)
3650 struct nft_set_binding *i;
3651 struct nft_set_iter iter;
3653 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
3656 if (binding->flags & NFT_SET_MAP) {
3657 /* If the set is already bound to the same chain all
3658 * jumps are already validated for that chain.
3660 list_for_each_entry(i, &set->bindings, list) {
3661 if (i->flags & NFT_SET_MAP &&
3662 i->chain == binding->chain)
3666 iter.genmask = nft_genmask_next(ctx->net);
3670 iter.fn = nf_tables_bind_check_setelem;
3672 set->ops->walk(ctx, set, &iter);
3677 binding->chain = ctx->chain;
3678 list_add_tail_rcu(&binding->list, &set->bindings);
3681 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3683 void nf_tables_rebind_set(const struct nft_ctx *ctx, struct nft_set *set,
3684 struct nft_set_binding *binding)
3686 if (list_empty(&set->bindings) && nft_set_is_anonymous(set) &&
3687 nft_is_active(ctx->net, set))
3688 list_add_tail_rcu(&set->list, &ctx->table->sets);
3690 list_add_tail_rcu(&binding->list, &set->bindings);
3692 EXPORT_SYMBOL_GPL(nf_tables_rebind_set);
3694 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3695 struct nft_set_binding *binding)
3697 list_del_rcu(&binding->list);
3699 if (list_empty(&set->bindings) && nft_set_is_anonymous(set) &&
3700 nft_is_active(ctx->net, set))
3701 list_del_rcu(&set->list);
3703 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3705 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
3707 if (list_empty(&set->bindings) && nft_set_is_anonymous(set) &&
3708 nft_is_active(ctx->net, set)) {
3709 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
3710 nft_set_destroy(set);
3713 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
3715 const struct nft_set_ext_type nft_set_ext_types[] = {
3716 [NFT_SET_EXT_KEY] = {
3717 .align = __alignof__(u32),
3719 [NFT_SET_EXT_DATA] = {
3720 .align = __alignof__(u32),
3722 [NFT_SET_EXT_EXPR] = {
3723 .align = __alignof__(struct nft_expr),
3725 [NFT_SET_EXT_OBJREF] = {
3726 .len = sizeof(struct nft_object *),
3727 .align = __alignof__(struct nft_object *),
3729 [NFT_SET_EXT_FLAGS] = {
3731 .align = __alignof__(u8),
3733 [NFT_SET_EXT_TIMEOUT] = {
3735 .align = __alignof__(u64),
3737 [NFT_SET_EXT_EXPIRATION] = {
3739 .align = __alignof__(u64),
3741 [NFT_SET_EXT_USERDATA] = {
3742 .len = sizeof(struct nft_userdata),
3743 .align = __alignof__(struct nft_userdata),
3746 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3752 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3753 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3754 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3755 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3756 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3757 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3758 .len = NFT_USERDATA_MAXLEN },
3759 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
3760 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING },
3763 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3764 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3765 .len = NFT_TABLE_MAXNAMELEN - 1 },
3766 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3767 .len = NFT_SET_MAXNAMELEN - 1 },
3768 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3769 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3772 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3773 const struct sk_buff *skb,
3774 const struct nlmsghdr *nlh,
3775 const struct nlattr * const nla[],
3776 struct netlink_ext_ack *extack,
3779 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3780 int family = nfmsg->nfgen_family;
3781 struct nft_table *table;
3783 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
3785 if (IS_ERR(table)) {
3786 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
3787 return PTR_ERR(table);
3790 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3794 static int nf_tables_fill_setelem(struct sk_buff *skb,
3795 const struct nft_set *set,
3796 const struct nft_set_elem *elem)
3798 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3799 unsigned char *b = skb_tail_pointer(skb);
3800 struct nlattr *nest;
3802 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3804 goto nla_put_failure;
3806 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3807 NFT_DATA_VALUE, set->klen) < 0)
3808 goto nla_put_failure;
3810 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3811 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3812 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3814 goto nla_put_failure;
3816 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3817 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3818 goto nla_put_failure;
3820 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3821 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3822 (*nft_set_ext_obj(ext))->name) < 0)
3823 goto nla_put_failure;
3825 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3826 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3827 htonl(*nft_set_ext_flags(ext))))
3828 goto nla_put_failure;
3830 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3831 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3832 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
3834 goto nla_put_failure;
3836 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3837 u64 expires, now = get_jiffies_64();
3839 expires = *nft_set_ext_expiration(ext);
3840 if (time_before64(now, expires))
3845 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3846 nf_jiffies64_to_msecs(expires),
3848 goto nla_put_failure;
3851 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3852 struct nft_userdata *udata;
3854 udata = nft_set_ext_userdata(ext);
3855 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3856 udata->len + 1, udata->data))
3857 goto nla_put_failure;
3860 nla_nest_end(skb, nest);
3868 struct nft_set_dump_args {
3869 const struct netlink_callback *cb;
3870 struct nft_set_iter iter;
3871 struct sk_buff *skb;
3874 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3875 struct nft_set *set,
3876 const struct nft_set_iter *iter,
3877 struct nft_set_elem *elem)
3879 struct nft_set_dump_args *args;
3881 args = container_of(iter, struct nft_set_dump_args, iter);
3882 return nf_tables_fill_setelem(args->skb, set, elem);
3885 struct nft_set_dump_ctx {
3886 const struct nft_set *set;
3890 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3892 struct nft_set_dump_ctx *dump_ctx = cb->data;
3893 struct net *net = sock_net(skb->sk);
3894 struct nft_table *table;
3895 struct nft_set *set;
3896 struct nft_set_dump_args args;
3897 bool set_found = false;
3898 struct nfgenmsg *nfmsg;
3899 struct nlmsghdr *nlh;
3900 struct nlattr *nest;
3905 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3906 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
3907 dump_ctx->ctx.family != table->family)
3910 if (table != dump_ctx->ctx.table)
3913 list_for_each_entry_rcu(set, &table->sets, list) {
3914 if (set == dump_ctx->set) {
3927 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
3928 portid = NETLINK_CB(cb->skb).portid;
3929 seq = cb->nlh->nlmsg_seq;
3931 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3934 goto nla_put_failure;
3936 nfmsg = nlmsg_data(nlh);
3937 nfmsg->nfgen_family = table->family;
3938 nfmsg->version = NFNETLINK_V0;
3939 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3941 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
3942 goto nla_put_failure;
3943 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3944 goto nla_put_failure;
3946 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3948 goto nla_put_failure;
3952 args.iter.genmask = nft_genmask_cur(net);
3953 args.iter.skip = cb->args[0];
3954 args.iter.count = 0;
3956 args.iter.fn = nf_tables_dump_setelem;
3957 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
3960 nla_nest_end(skb, nest);
3961 nlmsg_end(skb, nlh);
3963 if (args.iter.err && args.iter.err != -EMSGSIZE)
3964 return args.iter.err;
3965 if (args.iter.count == cb->args[0])
3968 cb->args[0] = args.iter.count;
3976 static int nf_tables_dump_set_start(struct netlink_callback *cb)
3978 struct nft_set_dump_ctx *dump_ctx = cb->data;
3980 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
3982 return cb->data ? 0 : -ENOMEM;
3985 static int nf_tables_dump_set_done(struct netlink_callback *cb)
3991 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3992 const struct nft_ctx *ctx, u32 seq,
3993 u32 portid, int event, u16 flags,
3994 const struct nft_set *set,
3995 const struct nft_set_elem *elem)
3997 struct nfgenmsg *nfmsg;
3998 struct nlmsghdr *nlh;
3999 struct nlattr *nest;
4002 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4003 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4006 goto nla_put_failure;
4008 nfmsg = nlmsg_data(nlh);
4009 nfmsg->nfgen_family = ctx->family;
4010 nfmsg->version = NFNETLINK_V0;
4011 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
4013 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4014 goto nla_put_failure;
4015 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4016 goto nla_put_failure;
4018 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4020 goto nla_put_failure;
4022 err = nf_tables_fill_setelem(skb, set, elem);
4024 goto nla_put_failure;
4026 nla_nest_end(skb, nest);
4028 nlmsg_end(skb, nlh);
4032 nlmsg_trim(skb, nlh);
4036 static int nft_setelem_parse_flags(const struct nft_set *set,
4037 const struct nlattr *attr, u32 *flags)
4042 *flags = ntohl(nla_get_be32(attr));
4043 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4045 if (!(set->flags & NFT_SET_INTERVAL) &&
4046 *flags & NFT_SET_ELEM_INTERVAL_END)
4052 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4053 const struct nlattr *attr)
4055 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4056 struct nft_data_desc desc;
4057 struct nft_set_elem elem;
4058 struct sk_buff *skb;
4063 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4064 nft_set_elem_policy, NULL);
4068 if (!nla[NFTA_SET_ELEM_KEY])
4071 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4075 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4076 nla[NFTA_SET_ELEM_KEY]);
4081 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4084 priv = set->ops->get(ctx->net, set, &elem, flags);
4086 return PTR_ERR(priv);
4091 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
4095 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4096 NFT_MSG_NEWSETELEM, 0, set, &elem);
4100 err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT);
4101 /* This avoids a loop in nfnetlink. */
4109 /* this avoids a loop in nfnetlink. */
4110 return err == -EAGAIN ? -ENOBUFS : err;
4113 /* called with rcu_read_lock held */
4114 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4115 struct sk_buff *skb, const struct nlmsghdr *nlh,
4116 const struct nlattr * const nla[],
4117 struct netlink_ext_ack *extack)
4119 u8 genmask = nft_genmask_cur(net);
4120 struct nft_set *set;
4121 struct nlattr *attr;
4125 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4130 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4132 return PTR_ERR(set);
4134 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4135 struct netlink_dump_control c = {
4136 .start = nf_tables_dump_set_start,
4137 .dump = nf_tables_dump_set,
4138 .done = nf_tables_dump_set_done,
4139 .module = THIS_MODULE,
4141 struct nft_set_dump_ctx dump_ctx = {
4147 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4150 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4153 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4154 err = nft_get_set_elem(&ctx, set, attr);
4162 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4163 const struct nft_set *set,
4164 const struct nft_set_elem *elem,
4165 int event, u16 flags)
4167 struct net *net = ctx->net;
4168 u32 portid = ctx->portid;
4169 struct sk_buff *skb;
4172 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4175 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4179 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
4186 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
4190 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4193 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
4195 struct nft_set *set)
4197 struct nft_trans *trans;
4199 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
4203 nft_trans_elem_set(trans) = set;
4207 void *nft_set_elem_init(const struct nft_set *set,
4208 const struct nft_set_ext_tmpl *tmpl,
4209 const u32 *key, const u32 *data,
4210 u64 timeout, gfp_t gfp)
4212 struct nft_set_ext *ext;
4215 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
4219 ext = nft_set_elem_ext(set, elem);
4220 nft_set_ext_init(ext, tmpl);
4222 memcpy(nft_set_ext_key(ext), key, set->klen);
4223 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4224 memcpy(nft_set_ext_data(ext), data, set->dlen);
4225 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
4226 *nft_set_ext_expiration(ext) =
4227 get_jiffies_64() + timeout;
4228 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
4229 *nft_set_ext_timeout(ext) = timeout;
4234 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
4237 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4238 struct nft_ctx ctx = {
4239 .net = read_pnet(&set->net),
4240 .family = set->table->family,
4243 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
4244 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4245 nft_data_release(nft_set_ext_data(ext), set->dtype);
4246 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) {
4247 struct nft_expr *expr = nft_set_ext_expr(ext);
4249 if (expr->ops->destroy_clone) {
4250 expr->ops->destroy_clone(&ctx, expr);
4251 module_put(expr->ops->type->owner);
4253 nf_tables_expr_destroy(&ctx, expr);
4256 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4257 (*nft_set_ext_obj(ext))->use--;
4260 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
4262 /* Only called from commit path, nft_set_elem_deactivate() already deals with
4263 * the refcounting from the preparation phase.
4265 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
4266 const struct nft_set *set, void *elem)
4268 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4270 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
4271 nf_tables_expr_destroy(ctx, nft_set_ext_expr(ext));
4275 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4276 const struct nlattr *attr, u32 nlmsg_flags)
4278 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4279 u8 genmask = nft_genmask_next(ctx->net);
4280 struct nft_data_desc d1, d2;
4281 struct nft_set_ext_tmpl tmpl;
4282 struct nft_set_ext *ext, *ext2;
4283 struct nft_set_elem elem;
4284 struct nft_set_binding *binding;
4285 struct nft_object *obj = NULL;
4286 struct nft_userdata *udata;
4287 struct nft_data data;
4288 enum nft_registers dreg;
4289 struct nft_trans *trans;
4295 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4296 nft_set_elem_policy, NULL);
4300 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4303 nft_set_ext_prepare(&tmpl);
4305 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4309 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4311 if (set->flags & NFT_SET_MAP) {
4312 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
4313 !(flags & NFT_SET_ELEM_INTERVAL_END))
4315 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
4316 flags & NFT_SET_ELEM_INTERVAL_END)
4319 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4324 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
4325 if (!(set->flags & NFT_SET_TIMEOUT))
4327 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
4331 } else if (set->flags & NFT_SET_TIMEOUT) {
4332 timeout = set->timeout;
4335 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
4336 nla[NFTA_SET_ELEM_KEY]);
4340 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
4343 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
4345 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
4346 if (timeout != set->timeout)
4347 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
4350 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
4351 if (!(set->flags & NFT_SET_OBJECT)) {
4355 obj = nft_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
4356 set->objtype, genmask);
4361 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
4364 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
4365 err = nft_data_init(ctx, &data, sizeof(data), &d2,
4366 nla[NFTA_SET_ELEM_DATA]);
4371 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
4374 dreg = nft_type_to_reg(set->dtype);
4375 list_for_each_entry(binding, &set->bindings, list) {
4376 struct nft_ctx bind_ctx = {
4378 .family = ctx->family,
4379 .table = ctx->table,
4380 .chain = (struct nft_chain *)binding->chain,
4383 if (!(binding->flags & NFT_SET_MAP))
4386 err = nft_validate_register_store(&bind_ctx, dreg,
4392 if (d2.type == NFT_DATA_VERDICT &&
4393 (data.verdict.code == NFT_GOTO ||
4394 data.verdict.code == NFT_JUMP))
4395 nft_validate_state_update(ctx->net,
4399 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
4402 /* The full maximum length of userdata can exceed the maximum
4403 * offset value (U8_MAX) for following extensions, therefor it
4404 * must be the last extension added.
4407 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
4408 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
4410 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
4415 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
4416 timeout, GFP_KERNEL);
4417 if (elem.priv == NULL)
4420 ext = nft_set_elem_ext(set, elem.priv);
4422 *nft_set_ext_flags(ext) = flags;
4424 udata = nft_set_ext_userdata(ext);
4425 udata->len = ulen - 1;
4426 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
4429 *nft_set_ext_obj(ext) = obj;
4433 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
4437 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
4438 err = set->ops->insert(ctx->net, set, &elem, &ext2);
4440 if (err == -EEXIST) {
4441 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
4442 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
4443 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
4444 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
4448 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4449 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
4450 memcmp(nft_set_ext_data(ext),
4451 nft_set_ext_data(ext2), set->dlen) != 0) ||
4452 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4453 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
4454 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
4456 else if (!(nlmsg_flags & NLM_F_EXCL))
4463 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
4468 nft_trans_elem(trans) = elem;
4469 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4473 set->ops->remove(ctx->net, set, &elem);
4479 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4480 nft_data_release(&data, d2.type);
4482 nft_data_release(&elem.key.val, d1.type);
4487 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
4488 struct sk_buff *skb, const struct nlmsghdr *nlh,
4489 const struct nlattr * const nla[],
4490 struct netlink_ext_ack *extack)
4492 u8 genmask = nft_genmask_next(net);
4493 const struct nlattr *attr;
4494 struct nft_set *set;
4498 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
4501 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4506 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4507 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
4509 return PTR_ERR(set);
4511 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4514 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4515 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
4520 if (net->nft.validate_state == NFT_VALIDATE_DO)
4521 return nft_table_validate(net, ctx.table);
4527 * nft_data_hold - hold a nft_data item
4529 * @data: struct nft_data to release
4530 * @type: type of data
4532 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4533 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
4534 * NFT_GOTO verdicts. This function must be called on active data objects
4535 * from the second phase of the commit protocol.
4537 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
4539 if (type == NFT_DATA_VERDICT) {
4540 switch (data->verdict.code) {
4543 data->verdict.chain->use++;
4549 static void nft_set_elem_activate(const struct net *net,
4550 const struct nft_set *set,
4551 struct nft_set_elem *elem)
4553 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4555 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4556 nft_data_hold(nft_set_ext_data(ext), set->dtype);
4557 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4558 (*nft_set_ext_obj(ext))->use++;
4561 static void nft_set_elem_deactivate(const struct net *net,
4562 const struct nft_set *set,
4563 struct nft_set_elem *elem)
4565 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4567 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4568 nft_data_release(nft_set_ext_data(ext), set->dtype);
4569 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4570 (*nft_set_ext_obj(ext))->use--;
4573 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
4574 const struct nlattr *attr)
4576 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4577 struct nft_set_ext_tmpl tmpl;
4578 struct nft_data_desc desc;
4579 struct nft_set_elem elem;
4580 struct nft_set_ext *ext;
4581 struct nft_trans *trans;
4586 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4587 nft_set_elem_policy, NULL);
4592 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4595 nft_set_ext_prepare(&tmpl);
4597 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4601 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4603 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4604 nla[NFTA_SET_ELEM_KEY]);
4609 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4612 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
4615 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
4617 if (elem.priv == NULL)
4620 ext = nft_set_elem_ext(set, elem.priv);
4622 *nft_set_ext_flags(ext) = flags;
4624 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
4625 if (trans == NULL) {
4630 priv = set->ops->deactivate(ctx->net, set, &elem);
4638 nft_set_elem_deactivate(ctx->net, set, &elem);
4640 nft_trans_elem(trans) = elem;
4641 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4649 nft_data_release(&elem.key.val, desc.type);
4654 static int nft_flush_set(const struct nft_ctx *ctx,
4655 struct nft_set *set,
4656 const struct nft_set_iter *iter,
4657 struct nft_set_elem *elem)
4659 struct nft_trans *trans;
4662 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
4663 sizeof(struct nft_trans_elem), GFP_ATOMIC);
4667 if (!set->ops->flush(ctx->net, set, elem->priv)) {
4673 nft_set_elem_deactivate(ctx->net, set, elem);
4674 nft_trans_elem_set(trans) = set;
4675 nft_trans_elem(trans) = *elem;
4676 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4684 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
4685 struct sk_buff *skb, const struct nlmsghdr *nlh,
4686 const struct nlattr * const nla[],
4687 struct netlink_ext_ack *extack)
4689 u8 genmask = nft_genmask_next(net);
4690 const struct nlattr *attr;
4691 struct nft_set *set;
4695 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4700 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4702 return PTR_ERR(set);
4703 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4706 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
4707 struct nft_set_iter iter = {
4709 .fn = nft_flush_set,
4711 set->ops->walk(&ctx, set, &iter);
4716 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4717 err = nft_del_setelem(&ctx, set, attr);
4726 void nft_set_gc_batch_release(struct rcu_head *rcu)
4728 struct nft_set_gc_batch *gcb;
4731 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4732 for (i = 0; i < gcb->head.cnt; i++)
4733 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
4736 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4738 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4741 struct nft_set_gc_batch *gcb;
4743 gcb = kzalloc(sizeof(*gcb), gfp);
4746 gcb->head.set = set;
4749 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4756 * nft_register_obj- register nf_tables stateful object type
4759 * Registers the object type for use with nf_tables. Returns zero on
4760 * success or a negative errno code otherwise.
4762 int nft_register_obj(struct nft_object_type *obj_type)
4764 if (obj_type->type == NFT_OBJECT_UNSPEC)
4767 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4768 list_add_rcu(&obj_type->list, &nf_tables_objects);
4769 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4772 EXPORT_SYMBOL_GPL(nft_register_obj);
4775 * nft_unregister_obj - unregister nf_tables object type
4778 * Unregisters the object type for use with nf_tables.
4780 void nft_unregister_obj(struct nft_object_type *obj_type)
4782 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4783 list_del_rcu(&obj_type->list);
4784 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4786 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4788 struct nft_object *nft_obj_lookup(const struct nft_table *table,
4789 const struct nlattr *nla, u32 objtype,
4792 struct nft_object *obj;
4794 list_for_each_entry_rcu(obj, &table->objects, list) {
4795 if (!nla_strcmp(nla, obj->name) &&
4796 objtype == obj->ops->type->type &&
4797 nft_active_genmask(obj, genmask))
4800 return ERR_PTR(-ENOENT);
4802 EXPORT_SYMBOL_GPL(nft_obj_lookup);
4804 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
4805 const struct nlattr *nla,
4806 u32 objtype, u8 genmask)
4808 struct nft_object *obj;
4810 list_for_each_entry(obj, &table->objects, list) {
4811 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
4812 objtype == obj->ops->type->type &&
4813 nft_active_genmask(obj, genmask))
4816 return ERR_PTR(-ENOENT);
4819 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4820 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4821 .len = NFT_TABLE_MAXNAMELEN - 1 },
4822 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4823 .len = NFT_OBJ_MAXNAMELEN - 1 },
4824 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4825 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4826 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
4829 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4830 const struct nft_object_type *type,
4831 const struct nlattr *attr)
4834 const struct nft_object_ops *ops;
4835 struct nft_object *obj;
4838 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
4843 err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
4848 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4851 if (type->select_ops) {
4852 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
4862 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
4866 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
4879 return ERR_PTR(err);
4882 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
4883 struct nft_object *obj, bool reset)
4885 struct nlattr *nest;
4887 nest = nla_nest_start(skb, attr);
4889 goto nla_put_failure;
4890 if (obj->ops->dump(skb, obj, reset) < 0)
4891 goto nla_put_failure;
4892 nla_nest_end(skb, nest);
4899 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4901 const struct nft_object_type *type;
4903 list_for_each_entry(type, &nf_tables_objects, list) {
4904 if (objtype == type->type)
4910 static const struct nft_object_type *
4911 nft_obj_type_get(struct net *net, u32 objtype)
4913 const struct nft_object_type *type;
4915 type = __nft_obj_type_get(objtype);
4916 if (type != NULL && try_module_get(type->owner))
4919 lockdep_nfnl_nft_mutex_not_held();
4920 #ifdef CONFIG_MODULES
4922 nft_request_module(net, "nft-obj-%u", objtype);
4923 if (__nft_obj_type_get(objtype))
4924 return ERR_PTR(-EAGAIN);
4927 return ERR_PTR(-ENOENT);
4930 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4931 struct sk_buff *skb, const struct nlmsghdr *nlh,
4932 const struct nlattr * const nla[],
4933 struct netlink_ext_ack *extack)
4935 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4936 const struct nft_object_type *type;
4937 u8 genmask = nft_genmask_next(net);
4938 int family = nfmsg->nfgen_family;
4939 struct nft_table *table;
4940 struct nft_object *obj;
4945 if (!nla[NFTA_OBJ_TYPE] ||
4946 !nla[NFTA_OBJ_NAME] ||
4947 !nla[NFTA_OBJ_DATA])
4950 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
4951 if (IS_ERR(table)) {
4952 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
4953 return PTR_ERR(table);
4956 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4957 obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4960 if (err != -ENOENT) {
4961 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
4965 if (nlh->nlmsg_flags & NLM_F_EXCL) {
4966 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
4972 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
4974 type = nft_obj_type_get(net, objtype);
4976 return PTR_ERR(type);
4978 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
4984 obj->handle = nf_tables_alloc_handle(table);
4986 obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
4992 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4996 list_add_tail_rcu(&obj->list, &table->objects);
5002 if (obj->ops->destroy)
5003 obj->ops->destroy(&ctx, obj);
5006 module_put(type->owner);
5010 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
5011 u32 portid, u32 seq, int event, u32 flags,
5012 int family, const struct nft_table *table,
5013 struct nft_object *obj, bool reset)
5015 struct nfgenmsg *nfmsg;
5016 struct nlmsghdr *nlh;
5018 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5019 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5021 goto nla_put_failure;
5023 nfmsg = nlmsg_data(nlh);
5024 nfmsg->nfgen_family = family;
5025 nfmsg->version = NFNETLINK_V0;
5026 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5028 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
5029 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
5030 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
5031 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
5032 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
5033 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
5035 goto nla_put_failure;
5037 nlmsg_end(skb, nlh);
5041 nlmsg_trim(skb, nlh);
5045 struct nft_obj_filter {
5050 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
5052 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5053 const struct nft_table *table;
5054 unsigned int idx = 0, s_idx = cb->args[0];
5055 struct nft_obj_filter *filter = cb->data;
5056 struct net *net = sock_net(skb->sk);
5057 int family = nfmsg->nfgen_family;
5058 struct nft_object *obj;
5061 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5065 cb->seq = net->nft.base_seq;
5067 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5068 if (family != NFPROTO_UNSPEC && family != table->family)
5071 list_for_each_entry_rcu(obj, &table->objects, list) {
5072 if (!nft_is_active(net, obj))
5077 memset(&cb->args[1], 0,
5078 sizeof(cb->args) - sizeof(cb->args[0]));
5079 if (filter && filter->table &&
5080 strcmp(filter->table, table->name))
5083 filter->type != NFT_OBJECT_UNSPEC &&
5084 obj->ops->type->type != filter->type)
5087 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
5090 NLM_F_MULTI | NLM_F_APPEND,
5091 table->family, table,
5095 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5107 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
5109 const struct nlattr * const *nla = cb->data;
5110 struct nft_obj_filter *filter = NULL;
5112 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
5113 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5117 if (nla[NFTA_OBJ_TABLE]) {
5118 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
5119 if (!filter->table) {
5125 if (nla[NFTA_OBJ_TYPE])
5126 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5133 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
5135 struct nft_obj_filter *filter = cb->data;
5138 kfree(filter->table);
5145 /* called with rcu_read_lock held */
5146 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
5147 struct sk_buff *skb, const struct nlmsghdr *nlh,
5148 const struct nlattr * const nla[],
5149 struct netlink_ext_ack *extack)
5151 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5152 u8 genmask = nft_genmask_cur(net);
5153 int family = nfmsg->nfgen_family;
5154 const struct nft_table *table;
5155 struct nft_object *obj;
5156 struct sk_buff *skb2;
5161 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5162 struct netlink_dump_control c = {
5163 .start = nf_tables_dump_obj_start,
5164 .dump = nf_tables_dump_obj,
5165 .done = nf_tables_dump_obj_done,
5166 .module = THIS_MODULE,
5167 .data = (void *)nla,
5170 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5173 if (!nla[NFTA_OBJ_NAME] ||
5174 !nla[NFTA_OBJ_TYPE])
5177 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5178 if (IS_ERR(table)) {
5179 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5180 return PTR_ERR(table);
5183 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5184 obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
5186 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5187 return PTR_ERR(obj);
5190 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5194 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5197 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
5198 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
5199 family, table, obj, reset);
5203 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5209 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
5211 if (obj->ops->destroy)
5212 obj->ops->destroy(ctx, obj);
5214 module_put(obj->ops->type->owner);
5219 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
5220 struct sk_buff *skb, const struct nlmsghdr *nlh,
5221 const struct nlattr * const nla[],
5222 struct netlink_ext_ack *extack)
5224 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5225 u8 genmask = nft_genmask_next(net);
5226 int family = nfmsg->nfgen_family;
5227 const struct nlattr *attr;
5228 struct nft_table *table;
5229 struct nft_object *obj;
5233 if (!nla[NFTA_OBJ_TYPE] ||
5234 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
5237 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5238 if (IS_ERR(table)) {
5239 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5240 return PTR_ERR(table);
5243 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5244 if (nla[NFTA_OBJ_HANDLE]) {
5245 attr = nla[NFTA_OBJ_HANDLE];
5246 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
5248 attr = nla[NFTA_OBJ_NAME];
5249 obj = nft_obj_lookup(table, attr, objtype, genmask);
5253 NL_SET_BAD_ATTR(extack, attr);
5254 return PTR_ERR(obj);
5257 NL_SET_BAD_ATTR(extack, attr);
5261 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5263 return nft_delobj(&ctx, obj);
5266 void nft_obj_notify(struct net *net, struct nft_table *table,
5267 struct nft_object *obj, u32 portid, u32 seq, int event,
5268 int family, int report, gfp_t gfp)
5270 struct sk_buff *skb;
5274 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5277 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
5281 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
5288 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
5291 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5293 EXPORT_SYMBOL_GPL(nft_obj_notify);
5295 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
5296 struct nft_object *obj, int event)
5298 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
5299 ctx->family, ctx->report, GFP_KERNEL);
5305 void nft_register_flowtable_type(struct nf_flowtable_type *type)
5307 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5308 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
5309 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5311 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
5313 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
5315 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5316 list_del_rcu(&type->list);
5317 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5319 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
5321 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
5322 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
5323 .len = NFT_NAME_MAXLEN - 1 },
5324 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
5325 .len = NFT_NAME_MAXLEN - 1 },
5326 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
5327 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
5330 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
5331 const struct nlattr *nla, u8 genmask)
5333 struct nft_flowtable *flowtable;
5335 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5336 if (!nla_strcmp(nla, flowtable->name) &&
5337 nft_active_genmask(flowtable, genmask))
5340 return ERR_PTR(-ENOENT);
5342 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
5344 static struct nft_flowtable *
5345 nft_flowtable_lookup_byhandle(const struct nft_table *table,
5346 const struct nlattr *nla, u8 genmask)
5348 struct nft_flowtable *flowtable;
5350 list_for_each_entry(flowtable, &table->flowtables, list) {
5351 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
5352 nft_active_genmask(flowtable, genmask))
5355 return ERR_PTR(-ENOENT);
5358 static int nf_tables_parse_devices(const struct nft_ctx *ctx,
5359 const struct nlattr *attr,
5360 struct net_device *dev_array[], int *len)
5362 const struct nlattr *tmp;
5363 struct net_device *dev;
5364 char ifname[IFNAMSIZ];
5365 int rem, n = 0, err;
5367 nla_for_each_nested(tmp, attr, rem) {
5368 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
5373 nla_strlcpy(ifname, tmp, IFNAMSIZ);
5374 dev = __dev_get_by_name(ctx->net, ifname);
5380 dev_array[n++] = dev;
5381 if (n == NFT_FLOWTABLE_DEVICE_MAX) {
5395 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
5396 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
5397 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
5398 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
5401 static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx,
5402 const struct nlattr *attr,
5403 struct nft_flowtable *flowtable)
5405 struct net_device *dev_array[NFT_FLOWTABLE_DEVICE_MAX];
5406 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
5407 struct nf_hook_ops *ops;
5408 int hooknum, priority;
5411 err = nla_parse_nested(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
5412 nft_flowtable_hook_policy, NULL);
5416 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
5417 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] ||
5418 !tb[NFTA_FLOWTABLE_HOOK_DEVS])
5421 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
5422 if (hooknum != NF_NETDEV_INGRESS)
5425 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
5427 err = nf_tables_parse_devices(ctx, tb[NFTA_FLOWTABLE_HOOK_DEVS],
5432 ops = kcalloc(n, sizeof(struct nf_hook_ops), GFP_KERNEL);
5436 flowtable->hooknum = hooknum;
5437 flowtable->priority = priority;
5438 flowtable->ops = ops;
5439 flowtable->ops_len = n;
5441 for (i = 0; i < n; i++) {
5442 flowtable->ops[i].pf = NFPROTO_NETDEV;
5443 flowtable->ops[i].hooknum = hooknum;
5444 flowtable->ops[i].priority = priority;
5445 flowtable->ops[i].priv = &flowtable->data;
5446 flowtable->ops[i].hook = flowtable->data.type->hook;
5447 flowtable->ops[i].dev = dev_array[i];
5453 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
5455 const struct nf_flowtable_type *type;
5457 list_for_each_entry(type, &nf_tables_flowtables, list) {
5458 if (family == type->family)
5464 static const struct nf_flowtable_type *
5465 nft_flowtable_type_get(struct net *net, u8 family)
5467 const struct nf_flowtable_type *type;
5469 type = __nft_flowtable_type_get(family);
5470 if (type != NULL && try_module_get(type->owner))
5473 lockdep_nfnl_nft_mutex_not_held();
5474 #ifdef CONFIG_MODULES
5476 nft_request_module(net, "nf-flowtable-%u", family);
5477 if (__nft_flowtable_type_get(family))
5478 return ERR_PTR(-EAGAIN);
5481 return ERR_PTR(-ENOENT);
5484 static void nft_unregister_flowtable_net_hooks(struct net *net,
5485 struct nft_flowtable *flowtable)
5489 for (i = 0; i < flowtable->ops_len; i++) {
5490 if (!flowtable->ops[i].dev)
5493 nf_unregister_net_hook(net, &flowtable->ops[i]);
5497 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
5498 struct sk_buff *skb,
5499 const struct nlmsghdr *nlh,
5500 const struct nlattr * const nla[],
5501 struct netlink_ext_ack *extack)
5503 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5504 const struct nf_flowtable_type *type;
5505 struct nft_flowtable *flowtable, *ft;
5506 u8 genmask = nft_genmask_next(net);
5507 int family = nfmsg->nfgen_family;
5508 struct nft_table *table;
5512 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5513 !nla[NFTA_FLOWTABLE_NAME] ||
5514 !nla[NFTA_FLOWTABLE_HOOK])
5517 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5519 if (IS_ERR(table)) {
5520 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5521 return PTR_ERR(table);
5524 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5526 if (IS_ERR(flowtable)) {
5527 err = PTR_ERR(flowtable);
5528 if (err != -ENOENT) {
5529 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5533 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5534 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5541 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5543 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
5547 flowtable->table = table;
5548 flowtable->handle = nf_tables_alloc_handle(table);
5550 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
5551 if (!flowtable->name) {
5556 type = nft_flowtable_type_get(net, family);
5558 err = PTR_ERR(type);
5562 flowtable->data.type = type;
5563 err = type->init(&flowtable->data);
5567 err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
5572 for (i = 0; i < flowtable->ops_len; i++) {
5573 if (!flowtable->ops[i].dev)
5576 list_for_each_entry(ft, &table->flowtables, list) {
5577 for (k = 0; k < ft->ops_len; k++) {
5578 if (!ft->ops[k].dev)
5581 if (flowtable->ops[i].dev == ft->ops[k].dev &&
5582 flowtable->ops[i].pf == ft->ops[k].pf) {
5589 err = nf_register_net_hook(net, &flowtable->ops[i]);
5594 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
5598 list_add_tail_rcu(&flowtable->list, &table->flowtables);
5603 i = flowtable->ops_len;
5605 for (k = i - 1; k >= 0; k--)
5606 nf_unregister_net_hook(net, &flowtable->ops[k]);
5608 kfree(flowtable->ops);
5610 flowtable->data.type->free(&flowtable->data);
5612 module_put(type->owner);
5614 kfree(flowtable->name);
5620 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
5621 struct sk_buff *skb,
5622 const struct nlmsghdr *nlh,
5623 const struct nlattr * const nla[],
5624 struct netlink_ext_ack *extack)
5626 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5627 u8 genmask = nft_genmask_next(net);
5628 int family = nfmsg->nfgen_family;
5629 struct nft_flowtable *flowtable;
5630 const struct nlattr *attr;
5631 struct nft_table *table;
5634 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5635 (!nla[NFTA_FLOWTABLE_NAME] &&
5636 !nla[NFTA_FLOWTABLE_HANDLE]))
5639 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5641 if (IS_ERR(table)) {
5642 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5643 return PTR_ERR(table);
5646 if (nla[NFTA_FLOWTABLE_HANDLE]) {
5647 attr = nla[NFTA_FLOWTABLE_HANDLE];
5648 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
5650 attr = nla[NFTA_FLOWTABLE_NAME];
5651 flowtable = nft_flowtable_lookup(table, attr, genmask);
5654 if (IS_ERR(flowtable)) {
5655 NL_SET_BAD_ATTR(extack, attr);
5656 return PTR_ERR(flowtable);
5658 if (flowtable->use > 0) {
5659 NL_SET_BAD_ATTR(extack, attr);
5663 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5665 return nft_delflowtable(&ctx, flowtable);
5668 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
5669 u32 portid, u32 seq, int event,
5670 u32 flags, int family,
5671 struct nft_flowtable *flowtable)
5673 struct nlattr *nest, *nest_devs;
5674 struct nfgenmsg *nfmsg;
5675 struct nlmsghdr *nlh;
5678 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5679 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5681 goto nla_put_failure;
5683 nfmsg = nlmsg_data(nlh);
5684 nfmsg->nfgen_family = family;
5685 nfmsg->version = NFNETLINK_V0;
5686 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5688 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
5689 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
5690 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
5691 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
5692 NFTA_FLOWTABLE_PAD))
5693 goto nla_put_failure;
5695 nest = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK);
5696 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
5697 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->priority)))
5698 goto nla_put_failure;
5700 nest_devs = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK_DEVS);
5702 goto nla_put_failure;
5704 for (i = 0; i < flowtable->ops_len; i++) {
5705 const struct net_device *dev = READ_ONCE(flowtable->ops[i].dev);
5708 nla_put_string(skb, NFTA_DEVICE_NAME, dev->name))
5709 goto nla_put_failure;
5711 nla_nest_end(skb, nest_devs);
5712 nla_nest_end(skb, nest);
5714 nlmsg_end(skb, nlh);
5718 nlmsg_trim(skb, nlh);
5722 struct nft_flowtable_filter {
5726 static int nf_tables_dump_flowtable(struct sk_buff *skb,
5727 struct netlink_callback *cb)
5729 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5730 struct nft_flowtable_filter *filter = cb->data;
5731 unsigned int idx = 0, s_idx = cb->args[0];
5732 struct net *net = sock_net(skb->sk);
5733 int family = nfmsg->nfgen_family;
5734 struct nft_flowtable *flowtable;
5735 const struct nft_table *table;
5738 cb->seq = net->nft.base_seq;
5740 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5741 if (family != NFPROTO_UNSPEC && family != table->family)
5744 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5745 if (!nft_is_active(net, flowtable))
5750 memset(&cb->args[1], 0,
5751 sizeof(cb->args) - sizeof(cb->args[0]));
5752 if (filter && filter->table &&
5753 strcmp(filter->table, table->name))
5756 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
5758 NFT_MSG_NEWFLOWTABLE,
5759 NLM_F_MULTI | NLM_F_APPEND,
5760 table->family, flowtable) < 0)
5763 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5775 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
5777 const struct nlattr * const *nla = cb->data;
5778 struct nft_flowtable_filter *filter = NULL;
5780 if (nla[NFTA_FLOWTABLE_TABLE]) {
5781 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5785 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
5787 if (!filter->table) {
5797 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
5799 struct nft_flowtable_filter *filter = cb->data;
5804 kfree(filter->table);
5810 /* called with rcu_read_lock held */
5811 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
5812 struct sk_buff *skb,
5813 const struct nlmsghdr *nlh,
5814 const struct nlattr * const nla[],
5815 struct netlink_ext_ack *extack)
5817 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5818 u8 genmask = nft_genmask_cur(net);
5819 int family = nfmsg->nfgen_family;
5820 struct nft_flowtable *flowtable;
5821 const struct nft_table *table;
5822 struct sk_buff *skb2;
5825 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5826 struct netlink_dump_control c = {
5827 .start = nf_tables_dump_flowtable_start,
5828 .dump = nf_tables_dump_flowtable,
5829 .done = nf_tables_dump_flowtable_done,
5830 .module = THIS_MODULE,
5831 .data = (void *)nla,
5834 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5837 if (!nla[NFTA_FLOWTABLE_NAME])
5840 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5843 return PTR_ERR(table);
5845 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5847 if (IS_ERR(flowtable))
5848 return PTR_ERR(flowtable);
5850 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5854 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
5856 NFT_MSG_NEWFLOWTABLE, 0, family,
5861 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5867 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
5868 struct nft_flowtable *flowtable,
5871 struct sk_buff *skb;
5875 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
5878 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5882 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
5884 ctx->family, flowtable);
5890 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
5891 ctx->report, GFP_KERNEL);
5894 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
5897 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
5899 kfree(flowtable->ops);
5900 kfree(flowtable->name);
5901 flowtable->data.type->free(&flowtable->data);
5902 module_put(flowtable->data.type->owner);
5906 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
5907 u32 portid, u32 seq)
5909 struct nlmsghdr *nlh;
5910 struct nfgenmsg *nfmsg;
5911 char buf[TASK_COMM_LEN];
5912 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
5914 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
5916 goto nla_put_failure;
5918 nfmsg = nlmsg_data(nlh);
5919 nfmsg->nfgen_family = AF_UNSPEC;
5920 nfmsg->version = NFNETLINK_V0;
5921 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5923 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
5924 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
5925 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
5926 goto nla_put_failure;
5928 nlmsg_end(skb, nlh);
5932 nlmsg_trim(skb, nlh);
5936 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
5937 struct nft_flowtable *flowtable)
5941 for (i = 0; i < flowtable->ops_len; i++) {
5942 if (flowtable->ops[i].dev != dev)
5945 nf_unregister_net_hook(dev_net(dev), &flowtable->ops[i]);
5946 flowtable->ops[i].dev = NULL;
5951 static int nf_tables_flowtable_event(struct notifier_block *this,
5952 unsigned long event, void *ptr)
5954 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
5955 struct nft_flowtable *flowtable;
5956 struct nft_table *table;
5959 if (event != NETDEV_UNREGISTER)
5963 mutex_lock(&net->nft.commit_mutex);
5964 list_for_each_entry(table, &net->nft.tables, list) {
5965 list_for_each_entry(flowtable, &table->flowtables, list) {
5966 nft_flowtable_event(event, dev, flowtable);
5969 mutex_unlock(&net->nft.commit_mutex);
5974 static struct notifier_block nf_tables_flowtable_notifier = {
5975 .notifier_call = nf_tables_flowtable_event,
5978 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
5981 struct nlmsghdr *nlh = nlmsg_hdr(skb);
5982 struct sk_buff *skb2;
5985 if (nlmsg_report(nlh) &&
5986 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5989 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5993 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6000 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6001 nlmsg_report(nlh), GFP_KERNEL);
6004 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6008 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
6009 struct sk_buff *skb, const struct nlmsghdr *nlh,
6010 const struct nlattr * const nla[],
6011 struct netlink_ext_ack *extack)
6013 struct sk_buff *skb2;
6016 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6020 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6025 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
6031 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
6032 [NFT_MSG_NEWTABLE] = {
6033 .call_batch = nf_tables_newtable,
6034 .attr_count = NFTA_TABLE_MAX,
6035 .policy = nft_table_policy,
6037 [NFT_MSG_GETTABLE] = {
6038 .call_rcu = nf_tables_gettable,
6039 .attr_count = NFTA_TABLE_MAX,
6040 .policy = nft_table_policy,
6042 [NFT_MSG_DELTABLE] = {
6043 .call_batch = nf_tables_deltable,
6044 .attr_count = NFTA_TABLE_MAX,
6045 .policy = nft_table_policy,
6047 [NFT_MSG_NEWCHAIN] = {
6048 .call_batch = nf_tables_newchain,
6049 .attr_count = NFTA_CHAIN_MAX,
6050 .policy = nft_chain_policy,
6052 [NFT_MSG_GETCHAIN] = {
6053 .call_rcu = nf_tables_getchain,
6054 .attr_count = NFTA_CHAIN_MAX,
6055 .policy = nft_chain_policy,
6057 [NFT_MSG_DELCHAIN] = {
6058 .call_batch = nf_tables_delchain,
6059 .attr_count = NFTA_CHAIN_MAX,
6060 .policy = nft_chain_policy,
6062 [NFT_MSG_NEWRULE] = {
6063 .call_batch = nf_tables_newrule,
6064 .attr_count = NFTA_RULE_MAX,
6065 .policy = nft_rule_policy,
6067 [NFT_MSG_GETRULE] = {
6068 .call_rcu = nf_tables_getrule,
6069 .attr_count = NFTA_RULE_MAX,
6070 .policy = nft_rule_policy,
6072 [NFT_MSG_DELRULE] = {
6073 .call_batch = nf_tables_delrule,
6074 .attr_count = NFTA_RULE_MAX,
6075 .policy = nft_rule_policy,
6077 [NFT_MSG_NEWSET] = {
6078 .call_batch = nf_tables_newset,
6079 .attr_count = NFTA_SET_MAX,
6080 .policy = nft_set_policy,
6082 [NFT_MSG_GETSET] = {
6083 .call_rcu = nf_tables_getset,
6084 .attr_count = NFTA_SET_MAX,
6085 .policy = nft_set_policy,
6087 [NFT_MSG_DELSET] = {
6088 .call_batch = nf_tables_delset,
6089 .attr_count = NFTA_SET_MAX,
6090 .policy = nft_set_policy,
6092 [NFT_MSG_NEWSETELEM] = {
6093 .call_batch = nf_tables_newsetelem,
6094 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6095 .policy = nft_set_elem_list_policy,
6097 [NFT_MSG_GETSETELEM] = {
6098 .call_rcu = nf_tables_getsetelem,
6099 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6100 .policy = nft_set_elem_list_policy,
6102 [NFT_MSG_DELSETELEM] = {
6103 .call_batch = nf_tables_delsetelem,
6104 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6105 .policy = nft_set_elem_list_policy,
6107 [NFT_MSG_GETGEN] = {
6108 .call_rcu = nf_tables_getgen,
6110 [NFT_MSG_NEWOBJ] = {
6111 .call_batch = nf_tables_newobj,
6112 .attr_count = NFTA_OBJ_MAX,
6113 .policy = nft_obj_policy,
6115 [NFT_MSG_GETOBJ] = {
6116 .call_rcu = nf_tables_getobj,
6117 .attr_count = NFTA_OBJ_MAX,
6118 .policy = nft_obj_policy,
6120 [NFT_MSG_DELOBJ] = {
6121 .call_batch = nf_tables_delobj,
6122 .attr_count = NFTA_OBJ_MAX,
6123 .policy = nft_obj_policy,
6125 [NFT_MSG_GETOBJ_RESET] = {
6126 .call_rcu = nf_tables_getobj,
6127 .attr_count = NFTA_OBJ_MAX,
6128 .policy = nft_obj_policy,
6130 [NFT_MSG_NEWFLOWTABLE] = {
6131 .call_batch = nf_tables_newflowtable,
6132 .attr_count = NFTA_FLOWTABLE_MAX,
6133 .policy = nft_flowtable_policy,
6135 [NFT_MSG_GETFLOWTABLE] = {
6136 .call_rcu = nf_tables_getflowtable,
6137 .attr_count = NFTA_FLOWTABLE_MAX,
6138 .policy = nft_flowtable_policy,
6140 [NFT_MSG_DELFLOWTABLE] = {
6141 .call_batch = nf_tables_delflowtable,
6142 .attr_count = NFTA_FLOWTABLE_MAX,
6143 .policy = nft_flowtable_policy,
6147 static int nf_tables_validate(struct net *net)
6149 struct nft_table *table;
6151 switch (net->nft.validate_state) {
6152 case NFT_VALIDATE_SKIP:
6154 case NFT_VALIDATE_NEED:
6155 nft_validate_state_update(net, NFT_VALIDATE_DO);
6157 case NFT_VALIDATE_DO:
6158 list_for_each_entry(table, &net->nft.tables, list) {
6159 if (nft_table_validate(net, table) < 0)
6168 static void nft_chain_commit_update(struct nft_trans *trans)
6170 struct nft_base_chain *basechain;
6172 if (nft_trans_chain_name(trans)) {
6173 rhltable_remove(&trans->ctx.table->chains_ht,
6174 &trans->ctx.chain->rhlhead,
6175 nft_chain_ht_params);
6176 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
6177 rhltable_insert_key(&trans->ctx.table->chains_ht,
6178 trans->ctx.chain->name,
6179 &trans->ctx.chain->rhlhead,
6180 nft_chain_ht_params);
6183 if (!nft_is_base_chain(trans->ctx.chain))
6186 basechain = nft_base_chain(trans->ctx.chain);
6187 nft_chain_stats_replace(trans->ctx.net, basechain,
6188 nft_trans_chain_stats(trans));
6190 switch (nft_trans_chain_policy(trans)) {
6193 basechain->policy = nft_trans_chain_policy(trans);
6198 static void nft_commit_release(struct nft_trans *trans)
6200 switch (trans->msg_type) {
6201 case NFT_MSG_DELTABLE:
6202 nf_tables_table_destroy(&trans->ctx);
6204 case NFT_MSG_NEWCHAIN:
6205 kfree(nft_trans_chain_name(trans));
6207 case NFT_MSG_DELCHAIN:
6208 nf_tables_chain_destroy(&trans->ctx);
6210 case NFT_MSG_DELRULE:
6211 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6213 case NFT_MSG_DELSET:
6214 nft_set_destroy(nft_trans_set(trans));
6216 case NFT_MSG_DELSETELEM:
6217 nf_tables_set_elem_destroy(&trans->ctx,
6218 nft_trans_elem_set(trans),
6219 nft_trans_elem(trans).priv);
6221 case NFT_MSG_DELOBJ:
6222 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6224 case NFT_MSG_DELFLOWTABLE:
6225 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6230 put_net(trans->ctx.net);
6235 static void nf_tables_trans_destroy_work(struct work_struct *w)
6237 struct nft_trans *trans, *next;
6240 spin_lock(&nf_tables_destroy_list_lock);
6241 list_splice_init(&nf_tables_destroy_list, &head);
6242 spin_unlock(&nf_tables_destroy_list_lock);
6244 if (list_empty(&head))
6249 list_for_each_entry_safe(trans, next, &head, list) {
6250 list_del(&trans->list);
6251 nft_commit_release(trans);
6255 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
6257 struct nft_rule *rule;
6258 unsigned int alloc = 0;
6261 /* already handled or inactive chain? */
6262 if (chain->rules_next || !nft_is_active_next(net, chain))
6265 rule = list_entry(&chain->rules, struct nft_rule, list);
6268 list_for_each_entry_continue(rule, &chain->rules, list) {
6269 if (nft_is_active_next(net, rule))
6273 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
6274 if (!chain->rules_next)
6277 list_for_each_entry_continue(rule, &chain->rules, list) {
6278 if (nft_is_active_next(net, rule))
6279 chain->rules_next[i++] = rule;
6282 chain->rules_next[i] = NULL;
6286 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
6288 struct nft_trans *trans, *next;
6290 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6291 struct nft_chain *chain = trans->ctx.chain;
6293 if (trans->msg_type == NFT_MSG_NEWRULE ||
6294 trans->msg_type == NFT_MSG_DELRULE) {
6295 kvfree(chain->rules_next);
6296 chain->rules_next = NULL;
6301 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
6303 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
6308 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
6310 struct nft_rule **r = rules;
6311 struct nft_rules_old *old;
6316 r++; /* rcu_head is after end marker */
6320 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
6323 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
6325 struct nft_rule **g0, **g1;
6328 next_genbit = nft_gencursor_next(net);
6330 g0 = rcu_dereference_protected(chain->rules_gen_0,
6331 lockdep_commit_lock_is_held(net));
6332 g1 = rcu_dereference_protected(chain->rules_gen_1,
6333 lockdep_commit_lock_is_held(net));
6335 /* No changes to this chain? */
6336 if (chain->rules_next == NULL) {
6337 /* chain had no change in last or next generation */
6341 * chain had no change in this generation; make sure next
6342 * one uses same rules as current generation.
6345 rcu_assign_pointer(chain->rules_gen_1, g0);
6346 nf_tables_commit_chain_free_rules_old(g1);
6348 rcu_assign_pointer(chain->rules_gen_0, g1);
6349 nf_tables_commit_chain_free_rules_old(g0);
6356 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
6358 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
6360 chain->rules_next = NULL;
6366 nf_tables_commit_chain_free_rules_old(g1);
6368 nf_tables_commit_chain_free_rules_old(g0);
6371 static void nft_chain_del(struct nft_chain *chain)
6373 struct nft_table *table = chain->table;
6375 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
6376 nft_chain_ht_params));
6377 list_del_rcu(&chain->list);
6380 static void nf_tables_commit_release(struct net *net)
6382 struct nft_trans *trans;
6384 /* all side effects have to be made visible.
6385 * For example, if a chain named 'foo' has been deleted, a
6386 * new transaction must not find it anymore.
6388 * Memory reclaim happens asynchronously from work queue
6389 * to prevent expensive synchronize_rcu() in commit phase.
6391 if (list_empty(&net->nft.commit_list)) {
6392 mutex_unlock(&net->nft.commit_mutex);
6396 trans = list_last_entry(&net->nft.commit_list,
6397 struct nft_trans, list);
6398 get_net(trans->ctx.net);
6399 WARN_ON_ONCE(trans->put_net);
6401 trans->put_net = true;
6402 spin_lock(&nf_tables_destroy_list_lock);
6403 list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
6404 spin_unlock(&nf_tables_destroy_list_lock);
6406 mutex_unlock(&net->nft.commit_mutex);
6408 schedule_work(&trans_destroy_work);
6411 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
6413 struct nft_trans *trans, *next;
6414 struct nft_trans_elem *te;
6415 struct nft_chain *chain;
6416 struct nft_table *table;
6418 /* 0. Validate ruleset, otherwise roll back for error reporting. */
6419 if (nf_tables_validate(net) < 0)
6422 /* 1. Allocate space for next generation rules_gen_X[] */
6423 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6426 if (trans->msg_type == NFT_MSG_NEWRULE ||
6427 trans->msg_type == NFT_MSG_DELRULE) {
6428 chain = trans->ctx.chain;
6430 ret = nf_tables_commit_chain_prepare(net, chain);
6432 nf_tables_commit_chain_prepare_cancel(net);
6438 /* step 2. Make rules_gen_X visible to packet path */
6439 list_for_each_entry(table, &net->nft.tables, list) {
6440 list_for_each_entry(chain, &table->chains, list)
6441 nf_tables_commit_chain(net, chain);
6445 * Bump generation counter, invalidate any dump in progress.
6446 * Cannot fail after this point.
6448 while (++net->nft.base_seq == 0);
6450 /* step 3. Start new generation, rules_gen_X now in use. */
6451 net->nft.gencursor = nft_gencursor_next(net);
6453 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6454 switch (trans->msg_type) {
6455 case NFT_MSG_NEWTABLE:
6456 if (nft_trans_table_update(trans)) {
6457 if (!nft_trans_table_enable(trans)) {
6458 nf_tables_table_disable(net,
6460 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6463 nft_clear(net, trans->ctx.table);
6465 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
6466 nft_trans_destroy(trans);
6468 case NFT_MSG_DELTABLE:
6469 list_del_rcu(&trans->ctx.table->list);
6470 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
6472 case NFT_MSG_NEWCHAIN:
6473 if (nft_trans_chain_update(trans)) {
6474 nft_chain_commit_update(trans);
6475 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6476 /* trans destroyed after rcu grace period */
6478 nft_clear(net, trans->ctx.chain);
6479 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6480 nft_trans_destroy(trans);
6483 case NFT_MSG_DELCHAIN:
6484 nft_chain_del(trans->ctx.chain);
6485 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
6486 nf_tables_unregister_hook(trans->ctx.net,
6490 case NFT_MSG_NEWRULE:
6491 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6492 nf_tables_rule_notify(&trans->ctx,
6493 nft_trans_rule(trans),
6495 nft_trans_destroy(trans);
6497 case NFT_MSG_DELRULE:
6498 list_del_rcu(&nft_trans_rule(trans)->list);
6499 nf_tables_rule_notify(&trans->ctx,
6500 nft_trans_rule(trans),
6503 case NFT_MSG_NEWSET:
6504 nft_clear(net, nft_trans_set(trans));
6505 /* This avoids hitting -EBUSY when deleting the table
6506 * from the transaction.
6508 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
6509 !list_empty(&nft_trans_set(trans)->bindings))
6510 trans->ctx.table->use--;
6512 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6513 NFT_MSG_NEWSET, GFP_KERNEL);
6514 nft_trans_destroy(trans);
6516 case NFT_MSG_DELSET:
6517 list_del_rcu(&nft_trans_set(trans)->list);
6518 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6519 NFT_MSG_DELSET, GFP_KERNEL);
6521 case NFT_MSG_NEWSETELEM:
6522 te = (struct nft_trans_elem *)trans->data;
6524 te->set->ops->activate(net, te->set, &te->elem);
6525 nf_tables_setelem_notify(&trans->ctx, te->set,
6527 NFT_MSG_NEWSETELEM, 0);
6528 nft_trans_destroy(trans);
6530 case NFT_MSG_DELSETELEM:
6531 te = (struct nft_trans_elem *)trans->data;
6533 nf_tables_setelem_notify(&trans->ctx, te->set,
6535 NFT_MSG_DELSETELEM, 0);
6536 te->set->ops->remove(net, te->set, &te->elem);
6537 atomic_dec(&te->set->nelems);
6540 case NFT_MSG_NEWOBJ:
6541 nft_clear(net, nft_trans_obj(trans));
6542 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6544 nft_trans_destroy(trans);
6546 case NFT_MSG_DELOBJ:
6547 list_del_rcu(&nft_trans_obj(trans)->list);
6548 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6551 case NFT_MSG_NEWFLOWTABLE:
6552 nft_clear(net, nft_trans_flowtable(trans));
6553 nf_tables_flowtable_notify(&trans->ctx,
6554 nft_trans_flowtable(trans),
6555 NFT_MSG_NEWFLOWTABLE);
6556 nft_trans_destroy(trans);
6558 case NFT_MSG_DELFLOWTABLE:
6559 list_del_rcu(&nft_trans_flowtable(trans)->list);
6560 nf_tables_flowtable_notify(&trans->ctx,
6561 nft_trans_flowtable(trans),
6562 NFT_MSG_DELFLOWTABLE);
6563 nft_unregister_flowtable_net_hooks(net,
6564 nft_trans_flowtable(trans));
6569 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
6570 nf_tables_commit_release(net);
6575 static void nf_tables_abort_release(struct nft_trans *trans)
6577 switch (trans->msg_type) {
6578 case NFT_MSG_NEWTABLE:
6579 nf_tables_table_destroy(&trans->ctx);
6581 case NFT_MSG_NEWCHAIN:
6582 nf_tables_chain_destroy(&trans->ctx);
6584 case NFT_MSG_NEWRULE:
6585 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6587 case NFT_MSG_NEWSET:
6588 nft_set_destroy(nft_trans_set(trans));
6590 case NFT_MSG_NEWSETELEM:
6591 nft_set_elem_destroy(nft_trans_elem_set(trans),
6592 nft_trans_elem(trans).priv, true);
6594 case NFT_MSG_NEWOBJ:
6595 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6597 case NFT_MSG_NEWFLOWTABLE:
6598 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6604 static int __nf_tables_abort(struct net *net)
6606 struct nft_trans *trans, *next;
6607 struct nft_trans_elem *te;
6609 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
6611 switch (trans->msg_type) {
6612 case NFT_MSG_NEWTABLE:
6613 if (nft_trans_table_update(trans)) {
6614 if (nft_trans_table_enable(trans)) {
6615 nf_tables_table_disable(net,
6617 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6619 nft_trans_destroy(trans);
6621 list_del_rcu(&trans->ctx.table->list);
6624 case NFT_MSG_DELTABLE:
6625 nft_clear(trans->ctx.net, trans->ctx.table);
6626 nft_trans_destroy(trans);
6628 case NFT_MSG_NEWCHAIN:
6629 if (nft_trans_chain_update(trans)) {
6630 free_percpu(nft_trans_chain_stats(trans));
6631 kfree(nft_trans_chain_name(trans));
6632 nft_trans_destroy(trans);
6634 trans->ctx.table->use--;
6635 nft_chain_del(trans->ctx.chain);
6636 nf_tables_unregister_hook(trans->ctx.net,
6641 case NFT_MSG_DELCHAIN:
6642 trans->ctx.table->use++;
6643 nft_clear(trans->ctx.net, trans->ctx.chain);
6644 nft_trans_destroy(trans);
6646 case NFT_MSG_NEWRULE:
6647 trans->ctx.chain->use--;
6648 list_del_rcu(&nft_trans_rule(trans)->list);
6649 nft_rule_expr_deactivate(&trans->ctx, nft_trans_rule(trans));
6651 case NFT_MSG_DELRULE:
6652 trans->ctx.chain->use++;
6653 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6654 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
6655 nft_trans_destroy(trans);
6657 case NFT_MSG_NEWSET:
6658 trans->ctx.table->use--;
6659 list_del_rcu(&nft_trans_set(trans)->list);
6661 case NFT_MSG_DELSET:
6662 trans->ctx.table->use++;
6663 nft_clear(trans->ctx.net, nft_trans_set(trans));
6664 nft_trans_destroy(trans);
6666 case NFT_MSG_NEWSETELEM:
6667 te = (struct nft_trans_elem *)trans->data;
6669 te->set->ops->remove(net, te->set, &te->elem);
6670 atomic_dec(&te->set->nelems);
6672 case NFT_MSG_DELSETELEM:
6673 te = (struct nft_trans_elem *)trans->data;
6675 nft_set_elem_activate(net, te->set, &te->elem);
6676 te->set->ops->activate(net, te->set, &te->elem);
6679 nft_trans_destroy(trans);
6681 case NFT_MSG_NEWOBJ:
6682 trans->ctx.table->use--;
6683 list_del_rcu(&nft_trans_obj(trans)->list);
6685 case NFT_MSG_DELOBJ:
6686 trans->ctx.table->use++;
6687 nft_clear(trans->ctx.net, nft_trans_obj(trans));
6688 nft_trans_destroy(trans);
6690 case NFT_MSG_NEWFLOWTABLE:
6691 trans->ctx.table->use--;
6692 list_del_rcu(&nft_trans_flowtable(trans)->list);
6693 nft_unregister_flowtable_net_hooks(net,
6694 nft_trans_flowtable(trans));
6696 case NFT_MSG_DELFLOWTABLE:
6697 trans->ctx.table->use++;
6698 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
6699 nft_trans_destroy(trans);
6706 list_for_each_entry_safe_reverse(trans, next,
6707 &net->nft.commit_list, list) {
6708 list_del(&trans->list);
6709 nf_tables_abort_release(trans);
6715 static void nf_tables_cleanup(struct net *net)
6717 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
6720 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
6722 int ret = __nf_tables_abort(net);
6724 mutex_unlock(&net->nft.commit_mutex);
6729 static bool nf_tables_valid_genid(struct net *net, u32 genid)
6733 mutex_lock(&net->nft.commit_mutex);
6735 genid_ok = genid == 0 || net->nft.base_seq == genid;
6737 mutex_unlock(&net->nft.commit_mutex);
6739 /* else, commit mutex has to be released by commit or abort function */
6743 static const struct nfnetlink_subsystem nf_tables_subsys = {
6744 .name = "nf_tables",
6745 .subsys_id = NFNL_SUBSYS_NFTABLES,
6746 .cb_count = NFT_MSG_MAX,
6748 .commit = nf_tables_commit,
6749 .abort = nf_tables_abort,
6750 .cleanup = nf_tables_cleanup,
6751 .valid_genid = nf_tables_valid_genid,
6752 .owner = THIS_MODULE,
6755 int nft_chain_validate_dependency(const struct nft_chain *chain,
6756 enum nft_chain_types type)
6758 const struct nft_base_chain *basechain;
6760 if (nft_is_base_chain(chain)) {
6761 basechain = nft_base_chain(chain);
6762 if (basechain->type->type != type)
6767 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
6769 int nft_chain_validate_hooks(const struct nft_chain *chain,
6770 unsigned int hook_flags)
6772 struct nft_base_chain *basechain;
6774 if (nft_is_base_chain(chain)) {
6775 basechain = nft_base_chain(chain);
6777 if ((1 << basechain->ops.hooknum) & hook_flags)
6785 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
6788 * Loop detection - walk through the ruleset beginning at the destination chain
6789 * of a new jump until either the source chain is reached (loop) or all
6790 * reachable chains have been traversed.
6792 * The loop check is performed whenever a new jump verdict is added to an
6793 * expression or verdict map or a verdict map is bound to a new chain.
6796 static int nf_tables_check_loops(const struct nft_ctx *ctx,
6797 const struct nft_chain *chain);
6799 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
6800 struct nft_set *set,
6801 const struct nft_set_iter *iter,
6802 struct nft_set_elem *elem)
6804 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6805 const struct nft_data *data;
6807 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6808 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
6811 data = nft_set_ext_data(ext);
6812 switch (data->verdict.code) {
6815 return nf_tables_check_loops(ctx, data->verdict.chain);
6821 static int nf_tables_check_loops(const struct nft_ctx *ctx,
6822 const struct nft_chain *chain)
6824 const struct nft_rule *rule;
6825 const struct nft_expr *expr, *last;
6826 struct nft_set *set;
6827 struct nft_set_binding *binding;
6828 struct nft_set_iter iter;
6830 if (ctx->chain == chain)
6833 list_for_each_entry(rule, &chain->rules, list) {
6834 nft_rule_for_each_expr(expr, last, rule) {
6835 struct nft_immediate_expr *priv;
6836 const struct nft_data *data;
6839 if (strcmp(expr->ops->type->name, "immediate"))
6842 priv = nft_expr_priv(expr);
6843 if (priv->dreg != NFT_REG_VERDICT)
6847 switch (data->verdict.code) {
6850 err = nf_tables_check_loops(ctx,
6851 data->verdict.chain);
6860 list_for_each_entry(set, &ctx->table->sets, list) {
6861 if (!nft_is_active_next(ctx->net, set))
6863 if (!(set->flags & NFT_SET_MAP) ||
6864 set->dtype != NFT_DATA_VERDICT)
6867 list_for_each_entry(binding, &set->bindings, list) {
6868 if (!(binding->flags & NFT_SET_MAP) ||
6869 binding->chain != chain)
6872 iter.genmask = nft_genmask_next(ctx->net);
6876 iter.fn = nf_tables_loop_check_setelem;
6878 set->ops->walk(ctx, set, &iter);
6888 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
6890 * @attr: netlink attribute to fetch value from
6891 * @max: maximum value to be stored in dest
6892 * @dest: pointer to the variable
6894 * Parse, check and store a given u32 netlink attribute into variable.
6895 * This function returns -ERANGE if the value goes over maximum value.
6896 * Otherwise a 0 is returned and the attribute value is stored in the
6897 * destination variable.
6899 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
6903 val = ntohl(nla_get_be32(attr));
6910 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
6913 * nft_parse_register - parse a register value from a netlink attribute
6915 * @attr: netlink attribute
6917 * Parse and translate a register value from a netlink attribute.
6918 * Registers used to be 128 bit wide, these register numbers will be
6919 * mapped to the corresponding 32 bit register numbers.
6921 unsigned int nft_parse_register(const struct nlattr *attr)
6925 reg = ntohl(nla_get_be32(attr));
6927 case NFT_REG_VERDICT...NFT_REG_4:
6928 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
6930 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
6933 EXPORT_SYMBOL_GPL(nft_parse_register);
6936 * nft_dump_register - dump a register value to a netlink attribute
6938 * @skb: socket buffer
6939 * @attr: attribute number
6940 * @reg: register number
6942 * Construct a netlink attribute containing the register number. For
6943 * compatibility reasons, register numbers being a multiple of 4 are
6944 * translated to the corresponding 128 bit register numbers.
6946 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
6948 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
6949 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
6951 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
6953 return nla_put_be32(skb, attr, htonl(reg));
6955 EXPORT_SYMBOL_GPL(nft_dump_register);
6958 * nft_validate_register_load - validate a load from a register
6960 * @reg: the register number
6961 * @len: the length of the data
6963 * Validate that the input register is one of the general purpose
6964 * registers and that the length of the load is within the bounds.
6966 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
6968 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
6972 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
6977 EXPORT_SYMBOL_GPL(nft_validate_register_load);
6980 * nft_validate_register_store - validate an expressions' register store
6982 * @ctx: context of the expression performing the load
6983 * @reg: the destination register number
6984 * @data: the data to load
6985 * @type: the data type
6986 * @len: the length of the data
6988 * Validate that a data load uses the appropriate data type for
6989 * the destination register and the length is within the bounds.
6990 * A value of NULL for the data means that its runtime gathered
6993 int nft_validate_register_store(const struct nft_ctx *ctx,
6994 enum nft_registers reg,
6995 const struct nft_data *data,
6996 enum nft_data_types type, unsigned int len)
7001 case NFT_REG_VERDICT:
7002 if (type != NFT_DATA_VERDICT)
7006 (data->verdict.code == NFT_GOTO ||
7007 data->verdict.code == NFT_JUMP)) {
7008 err = nf_tables_check_loops(ctx, data->verdict.chain);
7015 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7019 if (reg * NFT_REG32_SIZE + len >
7020 FIELD_SIZEOF(struct nft_regs, data))
7023 if (data != NULL && type != NFT_DATA_VALUE)
7028 EXPORT_SYMBOL_GPL(nft_validate_register_store);
7030 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
7031 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
7032 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
7033 .len = NFT_CHAIN_MAXNAMELEN - 1 },
7036 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
7037 struct nft_data_desc *desc, const struct nlattr *nla)
7039 u8 genmask = nft_genmask_next(ctx->net);
7040 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
7041 struct nft_chain *chain;
7044 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
7049 if (!tb[NFTA_VERDICT_CODE])
7051 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
7053 switch (data->verdict.code) {
7055 switch (data->verdict.code & NF_VERDICT_MASK) {
7070 if (!tb[NFTA_VERDICT_CHAIN])
7072 chain = nft_chain_lookup(ctx->net, ctx->table,
7073 tb[NFTA_VERDICT_CHAIN], genmask);
7075 return PTR_ERR(chain);
7076 if (nft_is_base_chain(chain))
7080 data->verdict.chain = chain;
7084 desc->len = sizeof(data->verdict);
7085 desc->type = NFT_DATA_VERDICT;
7089 static void nft_verdict_uninit(const struct nft_data *data)
7091 switch (data->verdict.code) {
7094 data->verdict.chain->use--;
7099 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
7101 struct nlattr *nest;
7103 nest = nla_nest_start(skb, type);
7105 goto nla_put_failure;
7107 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
7108 goto nla_put_failure;
7113 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
7115 goto nla_put_failure;
7117 nla_nest_end(skb, nest);
7124 static int nft_value_init(const struct nft_ctx *ctx,
7125 struct nft_data *data, unsigned int size,
7126 struct nft_data_desc *desc, const struct nlattr *nla)
7136 nla_memcpy(data->data, nla, len);
7137 desc->type = NFT_DATA_VALUE;
7142 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
7145 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
7148 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
7149 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
7150 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
7154 * nft_data_init - parse nf_tables data netlink attributes
7156 * @ctx: context of the expression using the data
7157 * @data: destination struct nft_data
7158 * @size: maximum data length
7159 * @desc: data description
7160 * @nla: netlink attribute containing data
7162 * Parse the netlink data attributes and initialize a struct nft_data.
7163 * The type and length of data are returned in the data description.
7165 * The caller can indicate that it only wants to accept data of type
7166 * NFT_DATA_VALUE by passing NULL for the ctx argument.
7168 int nft_data_init(const struct nft_ctx *ctx,
7169 struct nft_data *data, unsigned int size,
7170 struct nft_data_desc *desc, const struct nlattr *nla)
7172 struct nlattr *tb[NFTA_DATA_MAX + 1];
7175 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
7179 if (tb[NFTA_DATA_VALUE])
7180 return nft_value_init(ctx, data, size, desc,
7181 tb[NFTA_DATA_VALUE]);
7182 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
7183 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
7186 EXPORT_SYMBOL_GPL(nft_data_init);
7189 * nft_data_release - release a nft_data item
7191 * @data: struct nft_data to release
7192 * @type: type of data
7194 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7195 * all others need to be released by calling this function.
7197 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
7199 if (type < NFT_DATA_VERDICT)
7202 case NFT_DATA_VERDICT:
7203 return nft_verdict_uninit(data);
7208 EXPORT_SYMBOL_GPL(nft_data_release);
7210 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
7211 enum nft_data_types type, unsigned int len)
7213 struct nlattr *nest;
7216 nest = nla_nest_start(skb, attr);
7221 case NFT_DATA_VALUE:
7222 err = nft_value_dump(skb, data, len);
7224 case NFT_DATA_VERDICT:
7225 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
7232 nla_nest_end(skb, nest);
7235 EXPORT_SYMBOL_GPL(nft_data_dump);
7237 int __nft_release_basechain(struct nft_ctx *ctx)
7239 struct nft_rule *rule, *nr;
7241 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
7244 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
7245 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
7246 list_del(&rule->list);
7248 nf_tables_rule_release(ctx, rule);
7250 nft_chain_del(ctx->chain);
7252 nf_tables_chain_destroy(ctx);
7256 EXPORT_SYMBOL_GPL(__nft_release_basechain);
7258 static void __nft_release_tables(struct net *net)
7260 struct nft_flowtable *flowtable, *nf;
7261 struct nft_table *table, *nt;
7262 struct nft_chain *chain, *nc;
7263 struct nft_object *obj, *ne;
7264 struct nft_rule *rule, *nr;
7265 struct nft_set *set, *ns;
7266 struct nft_ctx ctx = {
7268 .family = NFPROTO_NETDEV,
7271 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
7272 ctx.family = table->family;
7274 list_for_each_entry(chain, &table->chains, list)
7275 nf_tables_unregister_hook(net, table, chain);
7276 /* No packets are walking on these chains anymore. */
7278 list_for_each_entry(chain, &table->chains, list) {
7280 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
7281 list_del(&rule->list);
7283 nf_tables_rule_release(&ctx, rule);
7286 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
7287 list_del(&flowtable->list);
7289 nf_tables_flowtable_destroy(flowtable);
7291 list_for_each_entry_safe(set, ns, &table->sets, list) {
7292 list_del(&set->list);
7294 nft_set_destroy(set);
7296 list_for_each_entry_safe(obj, ne, &table->objects, list) {
7297 list_del(&obj->list);
7299 nft_obj_destroy(&ctx, obj);
7301 list_for_each_entry_safe(chain, nc, &table->chains, list) {
7303 nft_chain_del(chain);
7305 nf_tables_chain_destroy(&ctx);
7307 list_del(&table->list);
7308 nf_tables_table_destroy(&ctx);
7312 static int __net_init nf_tables_init_net(struct net *net)
7314 INIT_LIST_HEAD(&net->nft.tables);
7315 INIT_LIST_HEAD(&net->nft.commit_list);
7316 mutex_init(&net->nft.commit_mutex);
7317 net->nft.base_seq = 1;
7318 net->nft.validate_state = NFT_VALIDATE_SKIP;
7323 static void __net_exit nf_tables_exit_net(struct net *net)
7325 mutex_lock(&net->nft.commit_mutex);
7326 if (!list_empty(&net->nft.commit_list))
7327 __nf_tables_abort(net);
7328 __nft_release_tables(net);
7329 mutex_unlock(&net->nft.commit_mutex);
7330 WARN_ON_ONCE(!list_empty(&net->nft.tables));
7333 static struct pernet_operations nf_tables_net_ops = {
7334 .init = nf_tables_init_net,
7335 .exit = nf_tables_exit_net,
7338 static int __init nf_tables_module_init(void)
7342 spin_lock_init(&nf_tables_destroy_list_lock);
7343 err = register_pernet_subsys(&nf_tables_net_ops);
7347 err = nft_chain_filter_init();
7351 err = nf_tables_core_module_init();
7355 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
7360 err = nfnetlink_subsys_register(&nf_tables_subsys);
7366 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7368 nf_tables_core_module_exit();
7370 nft_chain_filter_fini();
7372 unregister_pernet_subsys(&nf_tables_net_ops);
7376 static void __exit nf_tables_module_exit(void)
7378 nfnetlink_subsys_unregister(&nf_tables_subsys);
7379 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7380 nft_chain_filter_fini();
7381 unregister_pernet_subsys(&nf_tables_net_ops);
7382 cancel_work_sync(&trans_destroy_work);
7384 nf_tables_core_module_exit();
7387 module_init(nf_tables_module_init);
7388 module_exit(nf_tables_module_exit);
7390 MODULE_LICENSE("GPL");
7391 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
7392 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);