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/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_tables_core.h>
20 #include <net/netfilter/nf_tables.h>
21 #include <net/net_namespace.h>
24 static LIST_HEAD(nf_tables_expressions);
27 * nft_register_afinfo - register nf_tables address family info
29 * @afi: address family info to register
31 * Register the address family for use with nf_tables. Returns zero on
32 * success or a negative errno code otherwise.
34 int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
36 INIT_LIST_HEAD(&afi->tables);
37 nfnl_lock(NFNL_SUBSYS_NFTABLES);
38 list_add_tail_rcu(&afi->list, &net->nft.af_info);
39 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
42 EXPORT_SYMBOL_GPL(nft_register_afinfo);
44 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi);
47 * nft_unregister_afinfo - unregister nf_tables address family info
49 * @afi: address family info to unregister
51 * Unregister the address family for use with nf_tables.
53 void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi)
55 nfnl_lock(NFNL_SUBSYS_NFTABLES);
56 __nft_release_afinfo(net, afi);
57 list_del_rcu(&afi->list);
58 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
60 EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
62 static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
64 struct nft_af_info *afi;
66 list_for_each_entry(afi, &net->nft.af_info, list) {
67 if (afi->family == family)
73 static struct nft_af_info *
74 nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
76 struct nft_af_info *afi;
78 afi = nft_afinfo_lookup(net, family);
83 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
84 request_module("nft-afinfo-%u", family);
85 nfnl_lock(NFNL_SUBSYS_NFTABLES);
86 afi = nft_afinfo_lookup(net, family);
88 return ERR_PTR(-EAGAIN);
91 return ERR_PTR(-EAFNOSUPPORT);
94 static void nft_ctx_init(struct nft_ctx *ctx,
96 const struct sk_buff *skb,
97 const struct nlmsghdr *nlh,
98 struct nft_af_info *afi,
99 struct nft_table *table,
100 struct nft_chain *chain,
101 const struct nlattr * const *nla)
108 ctx->portid = NETLINK_CB(skb).portid;
109 ctx->report = nlmsg_report(nlh);
110 ctx->seq = nlh->nlmsg_seq;
113 static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type,
116 struct nft_trans *trans;
118 trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL);
122 trans->msg_type = msg_type;
128 static void nft_trans_destroy(struct nft_trans *trans)
130 list_del(&trans->list);
134 static int nft_register_basechain(struct nft_base_chain *basechain,
135 unsigned int hook_nops)
137 struct net *net = read_pnet(&basechain->pnet);
139 if (basechain->flags & NFT_BASECHAIN_DISABLED)
142 return nf_register_net_hooks(net, basechain->ops, hook_nops);
145 static void nft_unregister_basechain(struct nft_base_chain *basechain,
146 unsigned int hook_nops)
148 struct net *net = read_pnet(&basechain->pnet);
150 if (basechain->flags & NFT_BASECHAIN_DISABLED)
153 nf_unregister_net_hooks(net, basechain->ops, hook_nops);
156 static int nf_tables_register_hooks(const struct nft_table *table,
157 struct nft_chain *chain,
158 unsigned int hook_nops)
160 if (table->flags & NFT_TABLE_F_DORMANT ||
161 !(chain->flags & NFT_BASE_CHAIN))
164 return nft_register_basechain(nft_base_chain(chain), hook_nops);
167 static void nf_tables_unregister_hooks(const struct nft_table *table,
168 struct nft_chain *chain,
169 unsigned int hook_nops)
171 if (table->flags & NFT_TABLE_F_DORMANT ||
172 !(chain->flags & NFT_BASE_CHAIN))
175 nft_unregister_basechain(nft_base_chain(chain), hook_nops);
178 /* Internal table flags */
179 #define NFT_TABLE_INACTIVE (1 << 15)
181 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
183 struct nft_trans *trans;
185 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
189 if (msg_type == NFT_MSG_NEWTABLE)
190 ctx->table->flags |= NFT_TABLE_INACTIVE;
192 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
196 static int nft_deltable(struct nft_ctx *ctx)
200 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
204 list_del_rcu(&ctx->table->list);
208 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
210 struct nft_trans *trans;
212 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
216 if (msg_type == NFT_MSG_NEWCHAIN)
217 ctx->chain->flags |= NFT_CHAIN_INACTIVE;
219 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
223 static int nft_delchain(struct nft_ctx *ctx)
227 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
232 list_del_rcu(&ctx->chain->list);
238 nft_rule_is_active(struct net *net, const struct nft_rule *rule)
240 return (rule->genmask & nft_genmask_cur(net)) == 0;
244 nft_rule_is_active_next(struct net *net, const struct nft_rule *rule)
246 return (rule->genmask & nft_genmask_next(net)) == 0;
250 nft_rule_activate_next(struct net *net, struct nft_rule *rule)
252 /* Now inactive, will be active in the future */
253 rule->genmask = nft_genmask_cur(net);
257 nft_rule_deactivate_next(struct net *net, struct nft_rule *rule)
259 rule->genmask = nft_genmask_next(net);
262 static inline void nft_rule_clear(struct net *net, struct nft_rule *rule)
264 rule->genmask &= ~nft_genmask_next(net);
268 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
270 /* You cannot delete the same rule twice */
271 if (nft_rule_is_active_next(ctx->net, rule)) {
272 nft_rule_deactivate_next(ctx->net, rule);
279 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
280 struct nft_rule *rule)
282 struct nft_trans *trans;
284 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
288 nft_trans_rule(trans) = rule;
289 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
294 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
296 struct nft_trans *trans;
299 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
303 err = nf_tables_delrule_deactivate(ctx, rule);
305 nft_trans_destroy(trans);
312 static int nft_delrule_by_chain(struct nft_ctx *ctx)
314 struct nft_rule *rule;
317 list_for_each_entry(rule, &ctx->chain->rules, list) {
318 err = nft_delrule(ctx, rule);
325 /* Internal set flag */
326 #define NFT_SET_INACTIVE (1 << 15)
328 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
331 struct nft_trans *trans;
333 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
337 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
338 nft_trans_set_id(trans) =
339 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
340 set->flags |= NFT_SET_INACTIVE;
342 nft_trans_set(trans) = set;
343 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
348 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
352 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
356 list_del_rcu(&set->list);
366 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
367 const struct nlattr *nla)
369 struct nft_table *table;
371 list_for_each_entry(table, &afi->tables, list) {
372 if (!nla_strcmp(nla, table->name))
378 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
379 const struct nlattr *nla)
381 struct nft_table *table;
384 return ERR_PTR(-EINVAL);
386 table = nft_table_lookup(afi, nla);
390 return ERR_PTR(-ENOENT);
393 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
395 return ++table->hgenerator;
398 static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
400 static const struct nf_chain_type *
401 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
405 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
406 if (chain_type[family][i] != NULL &&
407 !nla_strcmp(nla, chain_type[family][i]->name))
408 return chain_type[family][i];
413 static const struct nf_chain_type *
414 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
415 const struct nlattr *nla,
418 const struct nf_chain_type *type;
420 type = __nf_tables_chain_type_lookup(afi->family, nla);
423 #ifdef CONFIG_MODULES
425 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
426 request_module("nft-chain-%u-%.*s", afi->family,
427 nla_len(nla), (const char *)nla_data(nla));
428 nfnl_lock(NFNL_SUBSYS_NFTABLES);
429 type = __nf_tables_chain_type_lookup(afi->family, nla);
431 return ERR_PTR(-EAGAIN);
434 return ERR_PTR(-ENOENT);
437 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
438 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
439 .len = NFT_TABLE_MAXNAMELEN - 1 },
440 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
443 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
444 u32 portid, u32 seq, int event, u32 flags,
445 int family, const struct nft_table *table)
447 struct nlmsghdr *nlh;
448 struct nfgenmsg *nfmsg;
450 event |= NFNL_SUBSYS_NFTABLES << 8;
451 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
453 goto nla_put_failure;
455 nfmsg = nlmsg_data(nlh);
456 nfmsg->nfgen_family = family;
457 nfmsg->version = NFNETLINK_V0;
458 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
460 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
461 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
462 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
463 goto nla_put_failure;
469 nlmsg_trim(skb, nlh);
473 static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
479 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
483 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
487 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
488 event, 0, ctx->afi->family, ctx->table);
494 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
495 ctx->report, GFP_KERNEL);
498 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
504 static int nf_tables_dump_tables(struct sk_buff *skb,
505 struct netlink_callback *cb)
507 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
508 const struct nft_af_info *afi;
509 const struct nft_table *table;
510 unsigned int idx = 0, s_idx = cb->args[0];
511 struct net *net = sock_net(skb->sk);
512 int family = nfmsg->nfgen_family;
515 cb->seq = net->nft.base_seq;
517 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
518 if (family != NFPROTO_UNSPEC && family != afi->family)
521 list_for_each_entry_rcu(table, &afi->tables, list) {
525 memset(&cb->args[1], 0,
526 sizeof(cb->args) - sizeof(cb->args[0]));
527 if (nf_tables_fill_table_info(skb, net,
528 NETLINK_CB(cb->skb).portid,
532 afi->family, table) < 0)
535 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
546 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
547 struct sk_buff *skb, const struct nlmsghdr *nlh,
548 const struct nlattr * const nla[])
550 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
551 const struct nft_af_info *afi;
552 const struct nft_table *table;
553 struct sk_buff *skb2;
554 int family = nfmsg->nfgen_family;
557 if (nlh->nlmsg_flags & NLM_F_DUMP) {
558 struct netlink_dump_control c = {
559 .dump = nf_tables_dump_tables,
561 return netlink_dump_start(nlsk, skb, nlh, &c);
564 afi = nf_tables_afinfo_lookup(net, family, false);
568 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
570 return PTR_ERR(table);
571 if (table->flags & NFT_TABLE_INACTIVE)
574 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
578 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
579 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
584 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
591 static int nf_tables_table_enable(const struct nft_af_info *afi,
592 struct nft_table *table)
594 struct nft_chain *chain;
597 list_for_each_entry(chain, &table->chains, list) {
598 if (!(chain->flags & NFT_BASE_CHAIN))
601 err = nft_register_basechain(nft_base_chain(chain), afi->nops);
609 list_for_each_entry(chain, &table->chains, list) {
610 if (!(chain->flags & NFT_BASE_CHAIN))
616 nft_unregister_basechain(nft_base_chain(chain), afi->nops);
621 static void nf_tables_table_disable(const struct nft_af_info *afi,
622 struct nft_table *table)
624 struct nft_chain *chain;
626 list_for_each_entry(chain, &table->chains, list) {
627 if (chain->flags & NFT_BASE_CHAIN)
628 nft_unregister_basechain(nft_base_chain(chain),
633 static int nf_tables_updtable(struct nft_ctx *ctx)
635 struct nft_trans *trans;
639 if (!ctx->nla[NFTA_TABLE_FLAGS])
642 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
643 if (flags & ~NFT_TABLE_F_DORMANT)
646 if (flags == ctx->table->flags)
649 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
650 sizeof(struct nft_trans_table));
654 if ((flags & NFT_TABLE_F_DORMANT) &&
655 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
656 nft_trans_table_enable(trans) = false;
657 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
658 ctx->table->flags & NFT_TABLE_F_DORMANT) {
659 ret = nf_tables_table_enable(ctx->afi, ctx->table);
661 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
662 nft_trans_table_enable(trans) = true;
668 nft_trans_table_update(trans) = true;
669 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
672 nft_trans_destroy(trans);
676 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
677 struct sk_buff *skb, const struct nlmsghdr *nlh,
678 const struct nlattr * const nla[])
680 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
681 const struct nlattr *name;
682 struct nft_af_info *afi;
683 struct nft_table *table;
684 int family = nfmsg->nfgen_family;
689 afi = nf_tables_afinfo_lookup(net, family, true);
693 name = nla[NFTA_TABLE_NAME];
694 table = nf_tables_table_lookup(afi, name);
696 if (PTR_ERR(table) != -ENOENT)
697 return PTR_ERR(table);
702 if (table->flags & NFT_TABLE_INACTIVE)
704 if (nlh->nlmsg_flags & NLM_F_EXCL)
706 if (nlh->nlmsg_flags & NLM_F_REPLACE)
709 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
710 return nf_tables_updtable(&ctx);
713 if (nla[NFTA_TABLE_FLAGS]) {
714 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
715 if (flags & ~NFT_TABLE_F_DORMANT)
720 if (!try_module_get(afi->owner))
724 table = kzalloc(sizeof(*table), GFP_KERNEL);
728 nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
729 INIT_LIST_HEAD(&table->chains);
730 INIT_LIST_HEAD(&table->sets);
731 table->flags = flags;
733 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
734 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
738 list_add_tail_rcu(&table->list, &afi->tables);
743 module_put(afi->owner);
748 static int nft_flush_table(struct nft_ctx *ctx)
751 struct nft_chain *chain, *nc;
752 struct nft_set *set, *ns;
754 list_for_each_entry(chain, &ctx->table->chains, list) {
757 err = nft_delrule_by_chain(ctx);
762 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
763 if (set->flags & NFT_SET_ANONYMOUS &&
764 !list_empty(&set->bindings))
767 err = nft_delset(ctx, set);
772 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
775 err = nft_delchain(ctx);
780 err = nft_deltable(ctx);
785 static int nft_flush(struct nft_ctx *ctx, int family)
787 struct nft_af_info *afi;
788 struct nft_table *table, *nt;
789 const struct nlattr * const *nla = ctx->nla;
792 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
793 if (family != AF_UNSPEC && afi->family != family)
797 list_for_each_entry_safe(table, nt, &afi->tables, list) {
798 if (nla[NFTA_TABLE_NAME] &&
799 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
804 err = nft_flush_table(ctx);
813 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
814 struct sk_buff *skb, const struct nlmsghdr *nlh,
815 const struct nlattr * const nla[])
817 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
818 struct nft_af_info *afi;
819 struct nft_table *table;
820 int family = nfmsg->nfgen_family;
823 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
824 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
825 return nft_flush(&ctx, family);
827 afi = nf_tables_afinfo_lookup(net, family, false);
831 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
833 return PTR_ERR(table);
838 return nft_flush_table(&ctx);
841 static void nf_tables_table_destroy(struct nft_ctx *ctx)
843 BUG_ON(ctx->table->use > 0);
846 module_put(ctx->afi->owner);
849 int nft_register_chain_type(const struct nf_chain_type *ctype)
853 nfnl_lock(NFNL_SUBSYS_NFTABLES);
854 if (chain_type[ctype->family][ctype->type] != NULL) {
858 chain_type[ctype->family][ctype->type] = ctype;
860 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
863 EXPORT_SYMBOL_GPL(nft_register_chain_type);
865 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
867 nfnl_lock(NFNL_SUBSYS_NFTABLES);
868 chain_type[ctype->family][ctype->type] = NULL;
869 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
871 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
877 static struct nft_chain *
878 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
880 struct nft_chain *chain;
882 list_for_each_entry(chain, &table->chains, list) {
883 if (chain->handle == handle)
887 return ERR_PTR(-ENOENT);
890 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
891 const struct nlattr *nla)
893 struct nft_chain *chain;
896 return ERR_PTR(-EINVAL);
898 list_for_each_entry(chain, &table->chains, list) {
899 if (!nla_strcmp(nla, chain->name))
903 return ERR_PTR(-ENOENT);
906 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
907 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
908 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
909 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
910 .len = NFT_CHAIN_MAXNAMELEN - 1 },
911 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
912 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
913 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
914 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
917 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
918 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
919 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
920 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
921 .len = IFNAMSIZ - 1 },
924 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
926 struct nft_stats *cpu_stats, total;
932 memset(&total, 0, sizeof(total));
933 for_each_possible_cpu(cpu) {
934 cpu_stats = per_cpu_ptr(stats, cpu);
936 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
937 pkts = cpu_stats->pkts;
938 bytes = cpu_stats->bytes;
939 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
941 total.bytes += bytes;
943 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
945 goto nla_put_failure;
947 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
949 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
951 goto nla_put_failure;
953 nla_nest_end(skb, nest);
960 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
961 u32 portid, u32 seq, int event, u32 flags,
962 int family, const struct nft_table *table,
963 const struct nft_chain *chain)
965 struct nlmsghdr *nlh;
966 struct nfgenmsg *nfmsg;
968 event |= NFNL_SUBSYS_NFTABLES << 8;
969 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
971 goto nla_put_failure;
973 nfmsg = nlmsg_data(nlh);
974 nfmsg->nfgen_family = family;
975 nfmsg->version = NFNETLINK_V0;
976 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
978 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
979 goto nla_put_failure;
980 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
982 goto nla_put_failure;
983 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
984 goto nla_put_failure;
986 if (chain->flags & NFT_BASE_CHAIN) {
987 const struct nft_base_chain *basechain = nft_base_chain(chain);
988 const struct nf_hook_ops *ops = &basechain->ops[0];
991 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
993 goto nla_put_failure;
994 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
995 goto nla_put_failure;
996 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
997 goto nla_put_failure;
998 if (basechain->dev_name[0] &&
999 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1000 goto nla_put_failure;
1001 nla_nest_end(skb, nest);
1003 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1004 htonl(basechain->policy)))
1005 goto nla_put_failure;
1007 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1008 goto nla_put_failure;
1010 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
1011 goto nla_put_failure;
1014 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1015 goto nla_put_failure;
1017 nlmsg_end(skb, nlh);
1021 nlmsg_trim(skb, nlh);
1025 static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1027 struct sk_buff *skb;
1031 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1035 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1039 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1040 event, 0, ctx->afi->family, ctx->table,
1047 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1048 ctx->report, GFP_KERNEL);
1051 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1057 static int nf_tables_dump_chains(struct sk_buff *skb,
1058 struct netlink_callback *cb)
1060 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1061 const struct nft_af_info *afi;
1062 const struct nft_table *table;
1063 const struct nft_chain *chain;
1064 unsigned int idx = 0, s_idx = cb->args[0];
1065 struct net *net = sock_net(skb->sk);
1066 int family = nfmsg->nfgen_family;
1069 cb->seq = net->nft.base_seq;
1071 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1072 if (family != NFPROTO_UNSPEC && family != afi->family)
1075 list_for_each_entry_rcu(table, &afi->tables, list) {
1076 list_for_each_entry_rcu(chain, &table->chains, list) {
1080 memset(&cb->args[1], 0,
1081 sizeof(cb->args) - sizeof(cb->args[0]));
1082 if (nf_tables_fill_chain_info(skb, net,
1083 NETLINK_CB(cb->skb).portid,
1087 afi->family, table, chain) < 0)
1090 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1102 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1103 struct sk_buff *skb, const struct nlmsghdr *nlh,
1104 const struct nlattr * const nla[])
1106 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1107 const struct nft_af_info *afi;
1108 const struct nft_table *table;
1109 const struct nft_chain *chain;
1110 struct sk_buff *skb2;
1111 int family = nfmsg->nfgen_family;
1114 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1115 struct netlink_dump_control c = {
1116 .dump = nf_tables_dump_chains,
1118 return netlink_dump_start(nlsk, skb, nlh, &c);
1121 afi = nf_tables_afinfo_lookup(net, family, false);
1123 return PTR_ERR(afi);
1125 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1127 return PTR_ERR(table);
1128 if (table->flags & NFT_TABLE_INACTIVE)
1131 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1133 return PTR_ERR(chain);
1134 if (chain->flags & NFT_CHAIN_INACTIVE)
1137 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1141 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1142 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1143 family, table, chain);
1147 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1154 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1155 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1156 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1159 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1161 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1162 struct nft_stats __percpu *newstats;
1163 struct nft_stats *stats;
1166 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1168 return ERR_PTR(err);
1170 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1171 return ERR_PTR(-EINVAL);
1173 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1174 if (newstats == NULL)
1175 return ERR_PTR(-ENOMEM);
1177 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1178 * are not exposed to userspace.
1181 stats = this_cpu_ptr(newstats);
1182 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1183 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1189 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1190 struct nft_stats __percpu *newstats)
1192 if (newstats == NULL)
1196 struct nft_stats __percpu *oldstats =
1197 nft_dereference(chain->stats);
1199 rcu_assign_pointer(chain->stats, newstats);
1201 free_percpu(oldstats);
1203 rcu_assign_pointer(chain->stats, newstats);
1206 static void nf_tables_chain_destroy(struct nft_chain *chain)
1208 BUG_ON(chain->use > 0);
1210 if (chain->flags & NFT_BASE_CHAIN) {
1211 struct nft_base_chain *basechain = nft_base_chain(chain);
1213 module_put(basechain->type->owner);
1214 free_percpu(basechain->stats);
1215 if (basechain->ops[0].dev != NULL)
1216 dev_put(basechain->ops[0].dev);
1223 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1224 struct sk_buff *skb, const struct nlmsghdr *nlh,
1225 const struct nlattr * const nla[])
1227 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1228 const struct nlattr * uninitialized_var(name);
1229 struct nft_af_info *afi;
1230 struct nft_table *table;
1231 struct nft_chain *chain;
1232 struct nft_base_chain *basechain = NULL;
1233 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1234 int family = nfmsg->nfgen_family;
1235 struct net_device *dev = NULL;
1236 u8 policy = NF_ACCEPT;
1239 struct nft_stats __percpu *stats;
1244 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1246 afi = nf_tables_afinfo_lookup(net, family, true);
1248 return PTR_ERR(afi);
1250 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1252 return PTR_ERR(table);
1255 name = nla[NFTA_CHAIN_NAME];
1257 if (nla[NFTA_CHAIN_HANDLE]) {
1258 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1259 chain = nf_tables_chain_lookup_byhandle(table, handle);
1261 return PTR_ERR(chain);
1263 chain = nf_tables_chain_lookup(table, name);
1264 if (IS_ERR(chain)) {
1265 if (PTR_ERR(chain) != -ENOENT)
1266 return PTR_ERR(chain);
1271 if (nla[NFTA_CHAIN_POLICY]) {
1272 if ((chain != NULL &&
1273 !(chain->flags & NFT_BASE_CHAIN)))
1276 if (chain == NULL &&
1277 nla[NFTA_CHAIN_HOOK] == NULL)
1280 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1290 if (chain != NULL) {
1291 struct nft_stats *stats = NULL;
1292 struct nft_trans *trans;
1294 if (chain->flags & NFT_CHAIN_INACTIVE)
1296 if (nlh->nlmsg_flags & NLM_F_EXCL)
1298 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1301 if (nla[NFTA_CHAIN_HANDLE] && name &&
1302 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
1305 if (nla[NFTA_CHAIN_COUNTERS]) {
1306 if (!(chain->flags & NFT_BASE_CHAIN))
1309 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1311 return PTR_ERR(stats);
1314 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1315 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1316 sizeof(struct nft_trans_chain));
1317 if (trans == NULL) {
1322 nft_trans_chain_stats(trans) = stats;
1323 nft_trans_chain_update(trans) = true;
1325 if (nla[NFTA_CHAIN_POLICY])
1326 nft_trans_chain_policy(trans) = policy;
1328 nft_trans_chain_policy(trans) = -1;
1330 if (nla[NFTA_CHAIN_HANDLE] && name) {
1331 nla_strlcpy(nft_trans_chain_name(trans), name,
1332 NFT_CHAIN_MAXNAMELEN);
1334 list_add_tail(&trans->list, &net->nft.commit_list);
1338 if (table->use == UINT_MAX)
1341 if (nla[NFTA_CHAIN_HOOK]) {
1342 const struct nf_chain_type *type;
1343 struct nf_hook_ops *ops;
1345 u32 hooknum, priority;
1347 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1348 if (nla[NFTA_CHAIN_TYPE]) {
1349 type = nf_tables_chain_type_lookup(afi,
1350 nla[NFTA_CHAIN_TYPE],
1353 return PTR_ERR(type);
1356 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1360 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1361 ha[NFTA_HOOK_PRIORITY] == NULL)
1364 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1365 if (hooknum >= afi->nhooks)
1367 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1369 if (!(type->hook_mask & (1 << hooknum)))
1371 if (!try_module_get(type->owner))
1373 hookfn = type->hooks[hooknum];
1375 if (afi->flags & NFT_AF_NEEDS_DEV) {
1376 char ifname[IFNAMSIZ];
1378 if (!ha[NFTA_HOOK_DEV]) {
1379 module_put(type->owner);
1383 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1384 dev = dev_get_by_name(net, ifname);
1386 module_put(type->owner);
1389 } else if (ha[NFTA_HOOK_DEV]) {
1390 module_put(type->owner);
1394 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1395 if (basechain == NULL) {
1396 module_put(type->owner);
1403 strncpy(basechain->dev_name, dev->name, IFNAMSIZ);
1405 if (nla[NFTA_CHAIN_COUNTERS]) {
1406 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1407 if (IS_ERR(stats)) {
1408 module_put(type->owner);
1412 return PTR_ERR(stats);
1414 basechain->stats = stats;
1416 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1417 if (stats == NULL) {
1418 module_put(type->owner);
1424 rcu_assign_pointer(basechain->stats, stats);
1427 write_pnet(&basechain->pnet, net);
1428 basechain->type = type;
1429 chain = &basechain->chain;
1431 for (i = 0; i < afi->nops; i++) {
1432 ops = &basechain->ops[i];
1434 ops->hooknum = hooknum;
1435 ops->priority = priority;
1437 ops->hook = afi->hooks[ops->hooknum];
1441 if (afi->hook_ops_init)
1442 afi->hook_ops_init(ops, i);
1445 chain->flags |= NFT_BASE_CHAIN;
1446 basechain->policy = policy;
1448 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1453 INIT_LIST_HEAD(&chain->rules);
1454 chain->handle = nf_tables_alloc_handle(table);
1455 chain->table = table;
1456 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1458 err = nf_tables_register_hooks(table, chain, afi->nops);
1462 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1463 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1468 list_add_tail_rcu(&chain->list, &table->chains);
1471 nf_tables_unregister_hooks(table, chain, afi->nops);
1473 nf_tables_chain_destroy(chain);
1477 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1478 struct sk_buff *skb, const struct nlmsghdr *nlh,
1479 const struct nlattr * const nla[])
1481 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1482 struct nft_af_info *afi;
1483 struct nft_table *table;
1484 struct nft_chain *chain;
1485 int family = nfmsg->nfgen_family;
1488 afi = nf_tables_afinfo_lookup(net, family, false);
1490 return PTR_ERR(afi);
1492 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1494 return PTR_ERR(table);
1496 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1498 return PTR_ERR(chain);
1502 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1504 return nft_delchain(&ctx);
1512 * nft_register_expr - register nf_tables expr type
1515 * Registers the expr type for use with nf_tables. Returns zero on
1516 * success or a negative errno code otherwise.
1518 int nft_register_expr(struct nft_expr_type *type)
1520 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1521 if (type->family == NFPROTO_UNSPEC)
1522 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1524 list_add_rcu(&type->list, &nf_tables_expressions);
1525 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1528 EXPORT_SYMBOL_GPL(nft_register_expr);
1531 * nft_unregister_expr - unregister nf_tables expr type
1534 * Unregisters the expr typefor use with nf_tables.
1536 void nft_unregister_expr(struct nft_expr_type *type)
1538 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1539 list_del_rcu(&type->list);
1540 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1542 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1544 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1547 const struct nft_expr_type *type;
1549 list_for_each_entry(type, &nf_tables_expressions, list) {
1550 if (!nla_strcmp(nla, type->name) &&
1551 (!type->family || type->family == family))
1557 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1560 const struct nft_expr_type *type;
1563 return ERR_PTR(-EINVAL);
1565 type = __nft_expr_type_get(family, nla);
1566 if (type != NULL && try_module_get(type->owner))
1569 #ifdef CONFIG_MODULES
1571 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1572 request_module("nft-expr-%u-%.*s", family,
1573 nla_len(nla), (char *)nla_data(nla));
1574 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1575 if (__nft_expr_type_get(family, nla))
1576 return ERR_PTR(-EAGAIN);
1578 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1579 request_module("nft-expr-%.*s",
1580 nla_len(nla), (char *)nla_data(nla));
1581 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1582 if (__nft_expr_type_get(family, nla))
1583 return ERR_PTR(-EAGAIN);
1586 return ERR_PTR(-ENOENT);
1589 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1590 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1591 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1594 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1595 const struct nft_expr *expr)
1597 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1598 goto nla_put_failure;
1600 if (expr->ops->dump) {
1601 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1603 goto nla_put_failure;
1604 if (expr->ops->dump(skb, expr) < 0)
1605 goto nla_put_failure;
1606 nla_nest_end(skb, data);
1615 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1616 const struct nft_expr *expr)
1618 struct nlattr *nest;
1620 nest = nla_nest_start(skb, attr);
1622 goto nla_put_failure;
1623 if (nf_tables_fill_expr_info(skb, expr) < 0)
1624 goto nla_put_failure;
1625 nla_nest_end(skb, nest);
1632 struct nft_expr_info {
1633 const struct nft_expr_ops *ops;
1634 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1637 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1638 const struct nlattr *nla,
1639 struct nft_expr_info *info)
1641 const struct nft_expr_type *type;
1642 const struct nft_expr_ops *ops;
1643 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1646 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1650 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1652 return PTR_ERR(type);
1654 if (tb[NFTA_EXPR_DATA]) {
1655 err = nla_parse_nested(info->tb, type->maxattr,
1656 tb[NFTA_EXPR_DATA], type->policy);
1660 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1662 if (type->select_ops != NULL) {
1663 ops = type->select_ops(ctx,
1664 (const struct nlattr * const *)info->tb);
1676 module_put(type->owner);
1680 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1681 const struct nft_expr_info *info,
1682 struct nft_expr *expr)
1684 const struct nft_expr_ops *ops = info->ops;
1689 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1701 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1702 struct nft_expr *expr)
1704 if (expr->ops->destroy)
1705 expr->ops->destroy(ctx, expr);
1706 module_put(expr->ops->type->owner);
1709 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1710 const struct nlattr *nla)
1712 struct nft_expr_info info;
1713 struct nft_expr *expr;
1716 err = nf_tables_expr_parse(ctx, nla, &info);
1721 expr = kzalloc(info.ops->size, GFP_KERNEL);
1725 err = nf_tables_newexpr(ctx, &info, expr);
1733 module_put(info.ops->type->owner);
1735 return ERR_PTR(err);
1738 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1740 nf_tables_expr_destroy(ctx, expr);
1748 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1751 struct nft_rule *rule;
1753 // FIXME: this sucks
1754 list_for_each_entry(rule, &chain->rules, list) {
1755 if (handle == rule->handle)
1759 return ERR_PTR(-ENOENT);
1762 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1763 const struct nlattr *nla)
1766 return ERR_PTR(-EINVAL);
1768 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1771 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1772 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1773 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1774 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1775 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1776 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1777 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1778 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1779 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1780 .len = NFT_USERDATA_MAXLEN },
1783 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1784 u32 portid, u32 seq, int event,
1785 u32 flags, int family,
1786 const struct nft_table *table,
1787 const struct nft_chain *chain,
1788 const struct nft_rule *rule)
1790 struct nlmsghdr *nlh;
1791 struct nfgenmsg *nfmsg;
1792 const struct nft_expr *expr, *next;
1793 struct nlattr *list;
1794 const struct nft_rule *prule;
1795 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1797 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1800 goto nla_put_failure;
1802 nfmsg = nlmsg_data(nlh);
1803 nfmsg->nfgen_family = family;
1804 nfmsg->version = NFNETLINK_V0;
1805 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1807 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1808 goto nla_put_failure;
1809 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1810 goto nla_put_failure;
1811 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1813 goto nla_put_failure;
1815 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1816 prule = list_entry(rule->list.prev, struct nft_rule, list);
1817 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1818 cpu_to_be64(prule->handle),
1820 goto nla_put_failure;
1823 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1825 goto nla_put_failure;
1826 nft_rule_for_each_expr(expr, next, rule) {
1827 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
1828 goto nla_put_failure;
1830 nla_nest_end(skb, list);
1833 struct nft_userdata *udata = nft_userdata(rule);
1834 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1836 goto nla_put_failure;
1839 nlmsg_end(skb, nlh);
1843 nlmsg_trim(skb, nlh);
1847 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1848 const struct nft_rule *rule,
1851 struct sk_buff *skb;
1855 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1859 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1863 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1864 event, 0, ctx->afi->family, ctx->table,
1871 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1872 ctx->report, GFP_KERNEL);
1875 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1881 static int nf_tables_dump_rules(struct sk_buff *skb,
1882 struct netlink_callback *cb)
1884 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1885 const struct nft_af_info *afi;
1886 const struct nft_table *table;
1887 const struct nft_chain *chain;
1888 const struct nft_rule *rule;
1889 unsigned int idx = 0, s_idx = cb->args[0];
1890 struct net *net = sock_net(skb->sk);
1891 int family = nfmsg->nfgen_family;
1894 cb->seq = net->nft.base_seq;
1896 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1897 if (family != NFPROTO_UNSPEC && family != afi->family)
1900 list_for_each_entry_rcu(table, &afi->tables, list) {
1901 list_for_each_entry_rcu(chain, &table->chains, list) {
1902 list_for_each_entry_rcu(rule, &chain->rules, list) {
1903 if (!nft_rule_is_active(net, rule))
1908 memset(&cb->args[1], 0,
1909 sizeof(cb->args) - sizeof(cb->args[0]));
1910 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
1913 NLM_F_MULTI | NLM_F_APPEND,
1914 afi->family, table, chain, rule) < 0)
1917 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1931 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
1932 struct sk_buff *skb, const struct nlmsghdr *nlh,
1933 const struct nlattr * const nla[])
1935 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1936 const struct nft_af_info *afi;
1937 const struct nft_table *table;
1938 const struct nft_chain *chain;
1939 const struct nft_rule *rule;
1940 struct sk_buff *skb2;
1941 int family = nfmsg->nfgen_family;
1944 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1945 struct netlink_dump_control c = {
1946 .dump = nf_tables_dump_rules,
1948 return netlink_dump_start(nlsk, skb, nlh, &c);
1951 afi = nf_tables_afinfo_lookup(net, family, false);
1953 return PTR_ERR(afi);
1955 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1957 return PTR_ERR(table);
1958 if (table->flags & NFT_TABLE_INACTIVE)
1961 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1963 return PTR_ERR(chain);
1964 if (chain->flags & NFT_CHAIN_INACTIVE)
1967 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1969 return PTR_ERR(rule);
1971 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1975 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
1976 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1977 family, table, chain, rule);
1981 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1988 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1989 struct nft_rule *rule)
1991 struct nft_expr *expr;
1994 * Careful: some expressions might not be initialized in case this
1995 * is called on error from nf_tables_newrule().
1997 expr = nft_expr_first(rule);
1998 while (expr->ops && expr != nft_expr_last(rule)) {
1999 nf_tables_expr_destroy(ctx, expr);
2000 expr = nft_expr_next(expr);
2005 #define NFT_RULE_MAXEXPRS 128
2007 static struct nft_expr_info *info;
2009 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2010 struct sk_buff *skb, const struct nlmsghdr *nlh,
2011 const struct nlattr * const nla[])
2013 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2014 struct nft_af_info *afi;
2015 struct nft_table *table;
2016 struct nft_chain *chain;
2017 struct nft_rule *rule, *old_rule = NULL;
2018 struct nft_userdata *udata;
2019 struct nft_trans *trans = NULL;
2020 struct nft_expr *expr;
2023 unsigned int size, i, n, ulen = 0, usize = 0;
2026 u64 handle, pos_handle;
2028 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2030 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2032 return PTR_ERR(afi);
2034 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
2036 return PTR_ERR(table);
2038 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2040 return PTR_ERR(chain);
2042 if (nla[NFTA_RULE_HANDLE]) {
2043 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2044 rule = __nf_tables_rule_lookup(chain, handle);
2046 return PTR_ERR(rule);
2048 if (nlh->nlmsg_flags & NLM_F_EXCL)
2050 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2055 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2057 handle = nf_tables_alloc_handle(table);
2059 if (chain->use == UINT_MAX)
2063 if (nla[NFTA_RULE_POSITION]) {
2064 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2067 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2068 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2069 if (IS_ERR(old_rule))
2070 return PTR_ERR(old_rule);
2073 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2077 if (nla[NFTA_RULE_EXPRESSIONS]) {
2078 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2080 if (nla_type(tmp) != NFTA_LIST_ELEM)
2082 if (n == NFT_RULE_MAXEXPRS)
2084 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2087 size += info[n].ops->size;
2091 /* Check for overflow of dlen field */
2093 if (size >= 1 << 12)
2096 if (nla[NFTA_RULE_USERDATA]) {
2097 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2099 usize = sizeof(struct nft_userdata) + ulen;
2103 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2107 nft_rule_activate_next(net, rule);
2109 rule->handle = handle;
2111 rule->udata = ulen ? 1 : 0;
2114 udata = nft_userdata(rule);
2115 udata->len = ulen - 1;
2116 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2119 expr = nft_expr_first(rule);
2120 for (i = 0; i < n; i++) {
2121 err = nf_tables_newexpr(&ctx, &info[i], expr);
2125 expr = nft_expr_next(expr);
2128 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2129 if (nft_rule_is_active_next(net, old_rule)) {
2130 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2132 if (trans == NULL) {
2136 nft_rule_deactivate_next(net, old_rule);
2138 list_add_tail_rcu(&rule->list, &old_rule->list);
2143 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2145 list_add_rcu(&rule->list, &old_rule->list);
2147 list_add_tail_rcu(&rule->list, &chain->rules);
2150 list_add_tail_rcu(&rule->list, &old_rule->list);
2152 list_add_rcu(&rule->list, &chain->rules);
2155 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2163 list_del_rcu(&rule->list);
2165 nf_tables_rule_destroy(&ctx, rule);
2167 for (i = 0; i < n; i++) {
2168 if (info[i].ops != NULL)
2169 module_put(info[i].ops->type->owner);
2174 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2175 struct sk_buff *skb, const struct nlmsghdr *nlh,
2176 const struct nlattr * const nla[])
2178 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2179 struct nft_af_info *afi;
2180 struct nft_table *table;
2181 struct nft_chain *chain = NULL;
2182 struct nft_rule *rule;
2183 int family = nfmsg->nfgen_family, err = 0;
2186 afi = nf_tables_afinfo_lookup(net, family, false);
2188 return PTR_ERR(afi);
2190 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
2192 return PTR_ERR(table);
2194 if (nla[NFTA_RULE_CHAIN]) {
2195 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2197 return PTR_ERR(chain);
2200 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2203 if (nla[NFTA_RULE_HANDLE]) {
2204 rule = nf_tables_rule_lookup(chain,
2205 nla[NFTA_RULE_HANDLE]);
2207 return PTR_ERR(rule);
2209 err = nft_delrule(&ctx, rule);
2211 err = nft_delrule_by_chain(&ctx);
2214 list_for_each_entry(chain, &table->chains, list) {
2216 err = nft_delrule_by_chain(&ctx);
2229 static LIST_HEAD(nf_tables_set_ops);
2231 int nft_register_set(struct nft_set_ops *ops)
2233 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2234 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2235 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2238 EXPORT_SYMBOL_GPL(nft_register_set);
2240 void nft_unregister_set(struct nft_set_ops *ops)
2242 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2243 list_del_rcu(&ops->list);
2244 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2246 EXPORT_SYMBOL_GPL(nft_unregister_set);
2249 * Select a set implementation based on the data characteristics and the
2250 * given policy. The total memory use might not be known if no size is
2251 * given, in that case the amount of memory per element is used.
2253 static const struct nft_set_ops *
2254 nft_select_set_ops(const struct nlattr * const nla[],
2255 const struct nft_set_desc *desc,
2256 enum nft_set_policies policy)
2258 const struct nft_set_ops *ops, *bops;
2259 struct nft_set_estimate est, best;
2262 #ifdef CONFIG_MODULES
2263 if (list_empty(&nf_tables_set_ops)) {
2264 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2265 request_module("nft-set");
2266 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2267 if (!list_empty(&nf_tables_set_ops))
2268 return ERR_PTR(-EAGAIN);
2272 if (nla[NFTA_SET_FLAGS] != NULL) {
2273 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2274 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT;
2281 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2282 if ((ops->features & features) != features)
2284 if (!ops->estimate(desc, features, &est))
2288 case NFT_SET_POL_PERFORMANCE:
2289 if (est.class < best.class)
2291 if (est.class == best.class && est.size < best.size)
2294 case NFT_SET_POL_MEMORY:
2295 if (est.size < best.size)
2297 if (est.size == best.size && est.class < best.class)
2304 if (!try_module_get(ops->owner))
2307 module_put(bops->owner);
2316 return ERR_PTR(-EOPNOTSUPP);
2319 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2320 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2321 [NFTA_SET_NAME] = { .type = NLA_STRING,
2322 .len = NFT_SET_MAXNAMELEN - 1 },
2323 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2324 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2325 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2326 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2327 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2328 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2329 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2330 [NFTA_SET_ID] = { .type = NLA_U32 },
2331 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2332 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2333 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2334 .len = NFT_USERDATA_MAXLEN },
2337 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2338 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2341 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2342 const struct sk_buff *skb,
2343 const struct nlmsghdr *nlh,
2344 const struct nlattr * const nla[])
2346 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2347 struct nft_af_info *afi = NULL;
2348 struct nft_table *table = NULL;
2350 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2351 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2353 return PTR_ERR(afi);
2356 if (nla[NFTA_SET_TABLE] != NULL) {
2358 return -EAFNOSUPPORT;
2360 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2362 return PTR_ERR(table);
2365 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
2369 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2370 const struct nlattr *nla)
2372 struct nft_set *set;
2375 return ERR_PTR(-EINVAL);
2377 list_for_each_entry(set, &table->sets, list) {
2378 if (!nla_strcmp(nla, set->name))
2381 return ERR_PTR(-ENOENT);
2384 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2385 const struct nlattr *nla)
2387 struct nft_trans *trans;
2388 u32 id = ntohl(nla_get_be32(nla));
2390 list_for_each_entry(trans, &net->nft.commit_list, list) {
2391 if (trans->msg_type == NFT_MSG_NEWSET &&
2392 id == nft_trans_set_id(trans))
2393 return nft_trans_set(trans);
2395 return ERR_PTR(-ENOENT);
2398 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2401 const struct nft_set *i;
2403 unsigned long *inuse;
2404 unsigned int n = 0, min = 0;
2406 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
2408 if (p[1] != 'd' || strchr(p + 2, '%'))
2411 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2415 list_for_each_entry(i, &ctx->table->sets, list) {
2418 if (!sscanf(i->name, name, &tmp))
2420 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2423 set_bit(tmp - min, inuse);
2426 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2427 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2428 min += BITS_PER_BYTE * PAGE_SIZE;
2429 memset(inuse, 0, PAGE_SIZE);
2432 free_page((unsigned long)inuse);
2435 snprintf(set->name, sizeof(set->name), name, min + n);
2436 list_for_each_entry(i, &ctx->table->sets, list) {
2437 if (!strcmp(set->name, i->name))
2443 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2444 const struct nft_set *set, u16 event, u16 flags)
2446 struct nfgenmsg *nfmsg;
2447 struct nlmsghdr *nlh;
2448 struct nlattr *desc;
2449 u32 portid = ctx->portid;
2452 event |= NFNL_SUBSYS_NFTABLES << 8;
2453 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2456 goto nla_put_failure;
2458 nfmsg = nlmsg_data(nlh);
2459 nfmsg->nfgen_family = ctx->afi->family;
2460 nfmsg->version = NFNETLINK_V0;
2461 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2463 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2464 goto nla_put_failure;
2465 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2466 goto nla_put_failure;
2467 if (set->flags != 0)
2468 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2469 goto nla_put_failure;
2471 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2472 goto nla_put_failure;
2473 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2474 goto nla_put_failure;
2475 if (set->flags & NFT_SET_MAP) {
2476 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2477 goto nla_put_failure;
2478 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2479 goto nla_put_failure;
2483 nla_put_be64(skb, NFTA_SET_TIMEOUT, cpu_to_be64(set->timeout),
2485 goto nla_put_failure;
2487 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2488 goto nla_put_failure;
2490 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2491 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2492 goto nla_put_failure;
2495 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2496 goto nla_put_failure;
2498 desc = nla_nest_start(skb, NFTA_SET_DESC);
2500 goto nla_put_failure;
2502 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2503 goto nla_put_failure;
2504 nla_nest_end(skb, desc);
2506 nlmsg_end(skb, nlh);
2510 nlmsg_trim(skb, nlh);
2514 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2515 const struct nft_set *set,
2516 int event, gfp_t gfp_flags)
2518 struct sk_buff *skb;
2519 u32 portid = ctx->portid;
2523 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2527 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2531 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2537 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2538 ctx->report, gfp_flags);
2541 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2545 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2547 const struct nft_set *set;
2548 unsigned int idx, s_idx = cb->args[0];
2549 struct nft_af_info *afi;
2550 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2551 struct net *net = sock_net(skb->sk);
2552 int cur_family = cb->args[3];
2553 struct nft_ctx *ctx = cb->data, ctx_set;
2559 cb->seq = net->nft.base_seq;
2561 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2562 if (ctx->afi && ctx->afi != afi)
2566 if (afi->family != cur_family)
2571 list_for_each_entry_rcu(table, &afi->tables, list) {
2572 if (ctx->table && ctx->table != table)
2576 if (cur_table != table)
2582 list_for_each_entry_rcu(set, &table->sets, list) {
2587 ctx_set.table = table;
2589 if (nf_tables_fill_set(skb, &ctx_set, set,
2593 cb->args[2] = (unsigned long) table;
2594 cb->args[3] = afi->family;
2597 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2611 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2617 static int nf_tables_getset(struct net *net, struct sock *nlsk,
2618 struct sk_buff *skb, const struct nlmsghdr *nlh,
2619 const struct nlattr * const nla[])
2621 const struct nft_set *set;
2623 struct sk_buff *skb2;
2624 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2627 /* Verify existence before starting dump */
2628 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla);
2632 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2633 struct netlink_dump_control c = {
2634 .dump = nf_tables_dump_sets,
2635 .done = nf_tables_dump_sets_done,
2637 struct nft_ctx *ctx_dump;
2639 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2640 if (ctx_dump == NULL)
2646 return netlink_dump_start(nlsk, skb, nlh, &c);
2649 /* Only accept unspec with dump */
2650 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2651 return -EAFNOSUPPORT;
2652 if (!nla[NFTA_SET_TABLE])
2655 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2657 return PTR_ERR(set);
2658 if (set->flags & NFT_SET_INACTIVE)
2661 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2665 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2669 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2676 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2677 struct nft_set_desc *desc,
2678 const struct nlattr *nla)
2680 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2683 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2687 if (da[NFTA_SET_DESC_SIZE] != NULL)
2688 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2693 static int nf_tables_newset(struct net *net, struct sock *nlsk,
2694 struct sk_buff *skb, const struct nlmsghdr *nlh,
2695 const struct nlattr * const nla[])
2697 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2698 const struct nft_set_ops *ops;
2699 struct nft_af_info *afi;
2700 struct nft_table *table;
2701 struct nft_set *set;
2703 char name[NFT_SET_MAXNAMELEN];
2707 u32 ktype, dtype, flags, policy, gc_int;
2708 struct nft_set_desc desc;
2709 unsigned char *udata;
2713 if (nla[NFTA_SET_TABLE] == NULL ||
2714 nla[NFTA_SET_NAME] == NULL ||
2715 nla[NFTA_SET_KEY_LEN] == NULL ||
2716 nla[NFTA_SET_ID] == NULL)
2719 memset(&desc, 0, sizeof(desc));
2721 ktype = NFT_DATA_VALUE;
2722 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2723 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2724 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2728 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2729 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
2733 if (nla[NFTA_SET_FLAGS] != NULL) {
2734 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2735 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2736 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2737 NFT_SET_MAP | NFT_SET_EVAL))
2739 /* Only one of both operations is supported */
2740 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL)) ==
2741 (NFT_SET_MAP | NFT_SET_EVAL))
2746 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2747 if (!(flags & NFT_SET_MAP))
2750 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2751 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2752 dtype != NFT_DATA_VERDICT)
2755 if (dtype != NFT_DATA_VERDICT) {
2756 if (nla[NFTA_SET_DATA_LEN] == NULL)
2758 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2759 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
2762 desc.dlen = sizeof(struct nft_verdict);
2763 } else if (flags & NFT_SET_MAP)
2767 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2768 if (!(flags & NFT_SET_TIMEOUT))
2770 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_TIMEOUT]));
2773 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2774 if (!(flags & NFT_SET_TIMEOUT))
2776 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2779 policy = NFT_SET_POL_PERFORMANCE;
2780 if (nla[NFTA_SET_POLICY] != NULL)
2781 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2783 if (nla[NFTA_SET_DESC] != NULL) {
2784 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2789 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2791 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2793 return PTR_ERR(afi);
2795 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2797 return PTR_ERR(table);
2799 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
2801 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2803 if (PTR_ERR(set) != -ENOENT)
2804 return PTR_ERR(set);
2809 if (nlh->nlmsg_flags & NLM_F_EXCL)
2811 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2816 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2819 ops = nft_select_set_ops(nla, &desc, policy);
2821 return PTR_ERR(ops);
2824 if (nla[NFTA_SET_USERDATA])
2825 udlen = nla_len(nla[NFTA_SET_USERDATA]);
2828 if (ops->privsize != NULL)
2829 size = ops->privsize(nla);
2832 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
2836 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2837 err = nf_tables_set_alloc_name(&ctx, set, name);
2843 udata = set->data + size;
2844 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
2847 INIT_LIST_HEAD(&set->bindings);
2848 write_pnet(&set->pnet, net);
2851 set->klen = desc.klen;
2853 set->dlen = desc.dlen;
2855 set->size = desc.size;
2856 set->policy = policy;
2859 set->timeout = timeout;
2860 set->gc_int = gc_int;
2862 err = ops->init(set, &desc, nla);
2866 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2870 list_add_tail_rcu(&set->list, &table->sets);
2877 module_put(ops->owner);
2881 static void nft_set_destroy(struct nft_set *set)
2883 set->ops->destroy(set);
2884 module_put(set->ops->owner);
2888 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2890 list_del_rcu(&set->list);
2891 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
2892 nft_set_destroy(set);
2895 static int nf_tables_delset(struct net *net, struct sock *nlsk,
2896 struct sk_buff *skb, const struct nlmsghdr *nlh,
2897 const struct nlattr * const nla[])
2899 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2900 struct nft_set *set;
2904 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2905 return -EAFNOSUPPORT;
2906 if (nla[NFTA_SET_TABLE] == NULL)
2909 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla);
2913 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2915 return PTR_ERR(set);
2916 if (!list_empty(&set->bindings))
2919 return nft_delset(&ctx, set);
2922 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2923 const struct nft_set *set,
2924 const struct nft_set_iter *iter,
2925 const struct nft_set_elem *elem)
2927 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
2928 enum nft_registers dreg;
2930 dreg = nft_type_to_reg(set->dtype);
2931 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
2932 set->dtype == NFT_DATA_VERDICT ?
2933 NFT_DATA_VERDICT : NFT_DATA_VALUE,
2937 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2938 struct nft_set_binding *binding)
2940 struct nft_set_binding *i;
2941 struct nft_set_iter iter;
2943 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2946 if (binding->flags & NFT_SET_MAP) {
2947 /* If the set is already bound to the same chain all
2948 * jumps are already validated for that chain.
2950 list_for_each_entry(i, &set->bindings, list) {
2951 if (i->flags & NFT_SET_MAP &&
2952 i->chain == binding->chain)
2956 iter.genmask = nft_genmask_next(ctx->net);
2960 iter.fn = nf_tables_bind_check_setelem;
2962 set->ops->walk(ctx, set, &iter);
2967 binding->chain = ctx->chain;
2968 list_add_tail_rcu(&binding->list, &set->bindings);
2972 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2973 struct nft_set_binding *binding)
2975 list_del_rcu(&binding->list);
2977 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2978 !(set->flags & NFT_SET_INACTIVE))
2979 nf_tables_set_destroy(ctx, set);
2982 const struct nft_set_ext_type nft_set_ext_types[] = {
2983 [NFT_SET_EXT_KEY] = {
2984 .align = __alignof__(u32),
2986 [NFT_SET_EXT_DATA] = {
2987 .align = __alignof__(u32),
2989 [NFT_SET_EXT_EXPR] = {
2990 .align = __alignof__(struct nft_expr),
2992 [NFT_SET_EXT_FLAGS] = {
2994 .align = __alignof__(u8),
2996 [NFT_SET_EXT_TIMEOUT] = {
2998 .align = __alignof__(u64),
3000 [NFT_SET_EXT_EXPIRATION] = {
3001 .len = sizeof(unsigned long),
3002 .align = __alignof__(unsigned long),
3004 [NFT_SET_EXT_USERDATA] = {
3005 .len = sizeof(struct nft_userdata),
3006 .align = __alignof__(struct nft_userdata),
3009 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3015 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3016 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3017 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3018 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3019 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3020 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3021 .len = NFT_USERDATA_MAXLEN },
3024 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3025 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
3026 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
3027 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3028 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3031 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3032 const struct sk_buff *skb,
3033 const struct nlmsghdr *nlh,
3034 const struct nlattr * const nla[])
3036 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3037 struct nft_af_info *afi;
3038 struct nft_table *table;
3040 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3042 return PTR_ERR(afi);
3044 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
3046 return PTR_ERR(table);
3048 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
3052 static int nf_tables_fill_setelem(struct sk_buff *skb,
3053 const struct nft_set *set,
3054 const struct nft_set_elem *elem)
3056 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3057 unsigned char *b = skb_tail_pointer(skb);
3058 struct nlattr *nest;
3060 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3062 goto nla_put_failure;
3064 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3065 NFT_DATA_VALUE, set->klen) < 0)
3066 goto nla_put_failure;
3068 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3069 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3070 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3072 goto nla_put_failure;
3074 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3075 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3076 goto nla_put_failure;
3078 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3079 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3080 htonl(*nft_set_ext_flags(ext))))
3081 goto nla_put_failure;
3083 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3084 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3085 cpu_to_be64(*nft_set_ext_timeout(ext)),
3087 goto nla_put_failure;
3089 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3090 unsigned long expires, now = jiffies;
3092 expires = *nft_set_ext_expiration(ext);
3093 if (time_before(now, expires))
3098 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3099 cpu_to_be64(jiffies_to_msecs(expires)),
3101 goto nla_put_failure;
3104 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3105 struct nft_userdata *udata;
3107 udata = nft_set_ext_userdata(ext);
3108 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3109 udata->len + 1, udata->data))
3110 goto nla_put_failure;
3113 nla_nest_end(skb, nest);
3121 struct nft_set_dump_args {
3122 const struct netlink_callback *cb;
3123 struct nft_set_iter iter;
3124 struct sk_buff *skb;
3127 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3128 const struct nft_set *set,
3129 const struct nft_set_iter *iter,
3130 const struct nft_set_elem *elem)
3132 struct nft_set_dump_args *args;
3134 args = container_of(iter, struct nft_set_dump_args, iter);
3135 return nf_tables_fill_setelem(args->skb, set, elem);
3138 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3140 struct net *net = sock_net(skb->sk);
3141 const struct nft_set *set;
3142 struct nft_set_dump_args args;
3144 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3145 struct nfgenmsg *nfmsg;
3146 struct nlmsghdr *nlh;
3147 struct nlattr *nest;
3151 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3152 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
3156 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
3160 if (ctx.table->flags & NFT_TABLE_INACTIVE)
3163 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3165 return PTR_ERR(set);
3166 if (set->flags & NFT_SET_INACTIVE)
3169 event = NFT_MSG_NEWSETELEM;
3170 event |= NFNL_SUBSYS_NFTABLES << 8;
3171 portid = NETLINK_CB(cb->skb).portid;
3172 seq = cb->nlh->nlmsg_seq;
3174 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3177 goto nla_put_failure;
3179 nfmsg = nlmsg_data(nlh);
3180 nfmsg->nfgen_family = ctx.afi->family;
3181 nfmsg->version = NFNETLINK_V0;
3182 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
3184 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3185 goto nla_put_failure;
3186 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3187 goto nla_put_failure;
3189 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3191 goto nla_put_failure;
3195 args.iter.genmask = nft_genmask_cur(ctx.net);
3196 args.iter.skip = cb->args[0];
3197 args.iter.count = 0;
3199 args.iter.fn = nf_tables_dump_setelem;
3200 set->ops->walk(&ctx, set, &args.iter);
3202 nla_nest_end(skb, nest);
3203 nlmsg_end(skb, nlh);
3205 if (args.iter.err && args.iter.err != -EMSGSIZE)
3206 return args.iter.err;
3207 if (args.iter.count == cb->args[0])
3210 cb->args[0] = args.iter.count;
3217 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3218 struct sk_buff *skb, const struct nlmsghdr *nlh,
3219 const struct nlattr * const nla[])
3221 const struct nft_set *set;
3225 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla);
3228 if (ctx.table->flags & NFT_TABLE_INACTIVE)
3231 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3233 return PTR_ERR(set);
3234 if (set->flags & NFT_SET_INACTIVE)
3237 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3238 struct netlink_dump_control c = {
3239 .dump = nf_tables_dump_set,
3241 return netlink_dump_start(nlsk, skb, nlh, &c);
3246 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3247 const struct nft_ctx *ctx, u32 seq,
3248 u32 portid, int event, u16 flags,
3249 const struct nft_set *set,
3250 const struct nft_set_elem *elem)
3252 struct nfgenmsg *nfmsg;
3253 struct nlmsghdr *nlh;
3254 struct nlattr *nest;
3257 event |= NFNL_SUBSYS_NFTABLES << 8;
3258 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3261 goto nla_put_failure;
3263 nfmsg = nlmsg_data(nlh);
3264 nfmsg->nfgen_family = ctx->afi->family;
3265 nfmsg->version = NFNETLINK_V0;
3266 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3268 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3269 goto nla_put_failure;
3270 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3271 goto nla_put_failure;
3273 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3275 goto nla_put_failure;
3277 err = nf_tables_fill_setelem(skb, set, elem);
3279 goto nla_put_failure;
3281 nla_nest_end(skb, nest);
3283 nlmsg_end(skb, nlh);
3287 nlmsg_trim(skb, nlh);
3291 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3292 const struct nft_set *set,
3293 const struct nft_set_elem *elem,
3294 int event, u16 flags)
3296 struct net *net = ctx->net;
3297 u32 portid = ctx->portid;
3298 struct sk_buff *skb;
3301 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3305 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3309 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3316 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3320 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3324 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3326 struct nft_set *set)
3328 struct nft_trans *trans;
3330 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3334 nft_trans_elem_set(trans) = set;
3338 void *nft_set_elem_init(const struct nft_set *set,
3339 const struct nft_set_ext_tmpl *tmpl,
3340 const u32 *key, const u32 *data,
3341 u64 timeout, gfp_t gfp)
3343 struct nft_set_ext *ext;
3346 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3350 ext = nft_set_elem_ext(set, elem);
3351 nft_set_ext_init(ext, tmpl);
3353 memcpy(nft_set_ext_key(ext), key, set->klen);
3354 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3355 memcpy(nft_set_ext_data(ext), data, set->dlen);
3356 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3357 *nft_set_ext_expiration(ext) =
3358 jiffies + msecs_to_jiffies(timeout);
3359 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3360 *nft_set_ext_timeout(ext) = timeout;
3365 void nft_set_elem_destroy(const struct nft_set *set, void *elem)
3367 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3369 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3370 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3371 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
3372 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3373 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3377 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3379 static int nft_setelem_parse_flags(const struct nft_set *set,
3380 const struct nlattr *attr, u32 *flags)
3385 *flags = ntohl(nla_get_be32(attr));
3386 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3388 if (!(set->flags & NFT_SET_INTERVAL) &&
3389 *flags & NFT_SET_ELEM_INTERVAL_END)
3395 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3396 const struct nlattr *attr)
3398 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3399 struct nft_data_desc d1, d2;
3400 struct nft_set_ext_tmpl tmpl;
3401 struct nft_set_ext *ext;
3402 struct nft_set_elem elem;
3403 struct nft_set_binding *binding;
3404 struct nft_userdata *udata;
3405 struct nft_data data;
3406 enum nft_registers dreg;
3407 struct nft_trans *trans;
3413 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3414 nft_set_elem_policy);
3418 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3421 nft_set_ext_prepare(&tmpl);
3423 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3427 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3429 if (set->flags & NFT_SET_MAP) {
3430 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3431 !(flags & NFT_SET_ELEM_INTERVAL_END))
3433 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3434 flags & NFT_SET_ELEM_INTERVAL_END)
3437 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3442 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3443 if (!(set->flags & NFT_SET_TIMEOUT))
3445 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_ELEM_TIMEOUT]));
3446 } else if (set->flags & NFT_SET_TIMEOUT) {
3447 timeout = set->timeout;
3450 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3451 nla[NFTA_SET_ELEM_KEY]);
3455 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3458 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3460 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3461 if (timeout != set->timeout)
3462 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3465 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3466 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3467 nla[NFTA_SET_ELEM_DATA]);
3472 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3475 dreg = nft_type_to_reg(set->dtype);
3476 list_for_each_entry(binding, &set->bindings, list) {
3477 struct nft_ctx bind_ctx = {
3479 .table = ctx->table,
3480 .chain = (struct nft_chain *)binding->chain,
3483 if (!(binding->flags & NFT_SET_MAP))
3486 err = nft_validate_register_store(&bind_ctx, dreg,
3493 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
3496 /* The full maximum length of userdata can exceed the maximum
3497 * offset value (U8_MAX) for following extensions, therefor it
3498 * must be the last extension added.
3501 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3502 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3504 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3509 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
3510 timeout, GFP_KERNEL);
3511 if (elem.priv == NULL)
3514 ext = nft_set_elem_ext(set, elem.priv);
3516 *nft_set_ext_flags(ext) = flags;
3518 udata = nft_set_ext_userdata(ext);
3519 udata->len = ulen - 1;
3520 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3523 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3527 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
3528 err = set->ops->insert(set, &elem);
3532 nft_trans_elem(trans) = elem;
3533 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3541 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3542 nft_data_uninit(&data, d2.type);
3544 nft_data_uninit(&elem.key.val, d1.type);
3549 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3550 struct sk_buff *skb, const struct nlmsghdr *nlh,
3551 const struct nlattr * const nla[])
3553 const struct nlattr *attr;
3554 struct nft_set *set;
3558 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3561 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla);
3565 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3567 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3568 set = nf_tables_set_lookup_byid(net,
3569 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3572 return PTR_ERR(set);
3575 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3578 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3580 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact))
3583 err = nft_add_set_elem(&ctx, set, attr);
3585 atomic_dec(&set->nelems);
3592 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3593 const struct nlattr *attr)
3595 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3596 struct nft_set_ext_tmpl tmpl;
3597 struct nft_data_desc desc;
3598 struct nft_set_elem elem;
3599 struct nft_set_ext *ext;
3600 struct nft_trans *trans;
3605 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3606 nft_set_elem_policy);
3611 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3614 nft_set_ext_prepare(&tmpl);
3616 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3620 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3622 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3623 nla[NFTA_SET_ELEM_KEY]);
3628 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3631 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3634 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3636 if (elem.priv == NULL)
3639 ext = nft_set_elem_ext(set, elem.priv);
3641 *nft_set_ext_flags(ext) = flags;
3643 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3644 if (trans == NULL) {
3649 priv = set->ops->deactivate(set, &elem);
3657 nft_trans_elem(trans) = elem;
3658 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3666 nft_data_uninit(&elem.key.val, desc.type);
3671 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3672 struct sk_buff *skb, const struct nlmsghdr *nlh,
3673 const struct nlattr * const nla[])
3675 const struct nlattr *attr;
3676 struct nft_set *set;
3680 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3683 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla);
3687 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3689 return PTR_ERR(set);
3690 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3693 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3694 err = nft_del_setelem(&ctx, set, attr);
3703 void nft_set_gc_batch_release(struct rcu_head *rcu)
3705 struct nft_set_gc_batch *gcb;
3708 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
3709 for (i = 0; i < gcb->head.cnt; i++)
3710 nft_set_elem_destroy(gcb->head.set, gcb->elems[i]);
3713 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
3715 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
3718 struct nft_set_gc_batch *gcb;
3720 gcb = kzalloc(sizeof(*gcb), gfp);
3723 gcb->head.set = set;
3726 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
3728 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
3729 u32 portid, u32 seq)
3731 struct nlmsghdr *nlh;
3732 struct nfgenmsg *nfmsg;
3733 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
3735 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
3737 goto nla_put_failure;
3739 nfmsg = nlmsg_data(nlh);
3740 nfmsg->nfgen_family = AF_UNSPEC;
3741 nfmsg->version = NFNETLINK_V0;
3742 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3744 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
3745 goto nla_put_failure;
3747 nlmsg_end(skb, nlh);
3751 nlmsg_trim(skb, nlh);
3755 static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
3757 struct nlmsghdr *nlh = nlmsg_hdr(skb);
3758 struct sk_buff *skb2;
3761 if (nlmsg_report(nlh) &&
3762 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3766 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3770 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3777 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
3778 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
3781 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
3787 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
3788 struct sk_buff *skb, const struct nlmsghdr *nlh,
3789 const struct nlattr * const nla[])
3791 struct sk_buff *skb2;
3794 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3798 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3803 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3809 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3810 [NFT_MSG_NEWTABLE] = {
3811 .call_batch = nf_tables_newtable,
3812 .attr_count = NFTA_TABLE_MAX,
3813 .policy = nft_table_policy,
3815 [NFT_MSG_GETTABLE] = {
3816 .call = nf_tables_gettable,
3817 .attr_count = NFTA_TABLE_MAX,
3818 .policy = nft_table_policy,
3820 [NFT_MSG_DELTABLE] = {
3821 .call_batch = nf_tables_deltable,
3822 .attr_count = NFTA_TABLE_MAX,
3823 .policy = nft_table_policy,
3825 [NFT_MSG_NEWCHAIN] = {
3826 .call_batch = nf_tables_newchain,
3827 .attr_count = NFTA_CHAIN_MAX,
3828 .policy = nft_chain_policy,
3830 [NFT_MSG_GETCHAIN] = {
3831 .call = nf_tables_getchain,
3832 .attr_count = NFTA_CHAIN_MAX,
3833 .policy = nft_chain_policy,
3835 [NFT_MSG_DELCHAIN] = {
3836 .call_batch = nf_tables_delchain,
3837 .attr_count = NFTA_CHAIN_MAX,
3838 .policy = nft_chain_policy,
3840 [NFT_MSG_NEWRULE] = {
3841 .call_batch = nf_tables_newrule,
3842 .attr_count = NFTA_RULE_MAX,
3843 .policy = nft_rule_policy,
3845 [NFT_MSG_GETRULE] = {
3846 .call = nf_tables_getrule,
3847 .attr_count = NFTA_RULE_MAX,
3848 .policy = nft_rule_policy,
3850 [NFT_MSG_DELRULE] = {
3851 .call_batch = nf_tables_delrule,
3852 .attr_count = NFTA_RULE_MAX,
3853 .policy = nft_rule_policy,
3855 [NFT_MSG_NEWSET] = {
3856 .call_batch = nf_tables_newset,
3857 .attr_count = NFTA_SET_MAX,
3858 .policy = nft_set_policy,
3860 [NFT_MSG_GETSET] = {
3861 .call = nf_tables_getset,
3862 .attr_count = NFTA_SET_MAX,
3863 .policy = nft_set_policy,
3865 [NFT_MSG_DELSET] = {
3866 .call_batch = nf_tables_delset,
3867 .attr_count = NFTA_SET_MAX,
3868 .policy = nft_set_policy,
3870 [NFT_MSG_NEWSETELEM] = {
3871 .call_batch = nf_tables_newsetelem,
3872 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3873 .policy = nft_set_elem_list_policy,
3875 [NFT_MSG_GETSETELEM] = {
3876 .call = nf_tables_getsetelem,
3877 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3878 .policy = nft_set_elem_list_policy,
3880 [NFT_MSG_DELSETELEM] = {
3881 .call_batch = nf_tables_delsetelem,
3882 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3883 .policy = nft_set_elem_list_policy,
3885 [NFT_MSG_GETGEN] = {
3886 .call = nf_tables_getgen,
3890 static void nft_chain_commit_update(struct nft_trans *trans)
3892 struct nft_base_chain *basechain;
3894 if (nft_trans_chain_name(trans)[0])
3895 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3897 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3900 basechain = nft_base_chain(trans->ctx.chain);
3901 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3903 switch (nft_trans_chain_policy(trans)) {
3906 basechain->policy = nft_trans_chain_policy(trans);
3911 static void nf_tables_commit_release(struct nft_trans *trans)
3913 switch (trans->msg_type) {
3914 case NFT_MSG_DELTABLE:
3915 nf_tables_table_destroy(&trans->ctx);
3917 case NFT_MSG_DELCHAIN:
3918 nf_tables_chain_destroy(trans->ctx.chain);
3920 case NFT_MSG_DELRULE:
3921 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3923 case NFT_MSG_DELSET:
3924 nft_set_destroy(nft_trans_set(trans));
3926 case NFT_MSG_DELSETELEM:
3927 nft_set_elem_destroy(nft_trans_elem_set(trans),
3928 nft_trans_elem(trans).priv);
3934 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
3936 struct nft_trans *trans, *next;
3937 struct nft_trans_elem *te;
3939 /* Bump generation counter, invalidate any dump in progress */
3940 while (++net->nft.base_seq == 0);
3942 /* A new generation has just started */
3943 net->nft.gencursor = nft_gencursor_next(net);
3945 /* Make sure all packets have left the previous generation before
3946 * purging old rules.
3950 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3951 switch (trans->msg_type) {
3952 case NFT_MSG_NEWTABLE:
3953 if (nft_trans_table_update(trans)) {
3954 if (!nft_trans_table_enable(trans)) {
3955 nf_tables_table_disable(trans->ctx.afi,
3957 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3960 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3962 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
3963 nft_trans_destroy(trans);
3965 case NFT_MSG_DELTABLE:
3966 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
3968 case NFT_MSG_NEWCHAIN:
3969 if (nft_trans_chain_update(trans))
3970 nft_chain_commit_update(trans);
3972 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
3974 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
3975 nft_trans_destroy(trans);
3977 case NFT_MSG_DELCHAIN:
3978 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
3979 nf_tables_unregister_hooks(trans->ctx.table,
3981 trans->ctx.afi->nops);
3983 case NFT_MSG_NEWRULE:
3984 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3985 nf_tables_rule_notify(&trans->ctx,
3986 nft_trans_rule(trans),
3988 nft_trans_destroy(trans);
3990 case NFT_MSG_DELRULE:
3991 list_del_rcu(&nft_trans_rule(trans)->list);
3992 nf_tables_rule_notify(&trans->ctx,
3993 nft_trans_rule(trans),
3996 case NFT_MSG_NEWSET:
3997 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
3998 /* This avoids hitting -EBUSY when deleting the table
3999 * from the transaction.
4001 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4002 !list_empty(&nft_trans_set(trans)->bindings))
4003 trans->ctx.table->use--;
4005 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4006 NFT_MSG_NEWSET, GFP_KERNEL);
4007 nft_trans_destroy(trans);
4009 case NFT_MSG_DELSET:
4010 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4011 NFT_MSG_DELSET, GFP_KERNEL);
4013 case NFT_MSG_NEWSETELEM:
4014 te = (struct nft_trans_elem *)trans->data;
4016 te->set->ops->activate(te->set, &te->elem);
4017 nf_tables_setelem_notify(&trans->ctx, te->set,
4019 NFT_MSG_NEWSETELEM, 0);
4020 nft_trans_destroy(trans);
4022 case NFT_MSG_DELSETELEM:
4023 te = (struct nft_trans_elem *)trans->data;
4025 nf_tables_setelem_notify(&trans->ctx, te->set,
4027 NFT_MSG_DELSETELEM, 0);
4028 te->set->ops->remove(te->set, &te->elem);
4029 atomic_dec(&te->set->nelems);
4037 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4038 list_del(&trans->list);
4039 nf_tables_commit_release(trans);
4042 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
4047 static void nf_tables_abort_release(struct nft_trans *trans)
4049 switch (trans->msg_type) {
4050 case NFT_MSG_NEWTABLE:
4051 nf_tables_table_destroy(&trans->ctx);
4053 case NFT_MSG_NEWCHAIN:
4054 nf_tables_chain_destroy(trans->ctx.chain);
4056 case NFT_MSG_NEWRULE:
4057 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4059 case NFT_MSG_NEWSET:
4060 nft_set_destroy(nft_trans_set(trans));
4062 case NFT_MSG_NEWSETELEM:
4063 nft_set_elem_destroy(nft_trans_elem_set(trans),
4064 nft_trans_elem(trans).priv);
4070 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
4072 struct nft_trans *trans, *next;
4073 struct nft_trans_elem *te;
4075 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4077 switch (trans->msg_type) {
4078 case NFT_MSG_NEWTABLE:
4079 if (nft_trans_table_update(trans)) {
4080 if (nft_trans_table_enable(trans)) {
4081 nf_tables_table_disable(trans->ctx.afi,
4083 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4085 nft_trans_destroy(trans);
4087 list_del_rcu(&trans->ctx.table->list);
4090 case NFT_MSG_DELTABLE:
4091 list_add_tail_rcu(&trans->ctx.table->list,
4092 &trans->ctx.afi->tables);
4093 nft_trans_destroy(trans);
4095 case NFT_MSG_NEWCHAIN:
4096 if (nft_trans_chain_update(trans)) {
4097 free_percpu(nft_trans_chain_stats(trans));
4099 nft_trans_destroy(trans);
4101 trans->ctx.table->use--;
4102 list_del_rcu(&trans->ctx.chain->list);
4103 nf_tables_unregister_hooks(trans->ctx.table,
4105 trans->ctx.afi->nops);
4108 case NFT_MSG_DELCHAIN:
4109 trans->ctx.table->use++;
4110 list_add_tail_rcu(&trans->ctx.chain->list,
4111 &trans->ctx.table->chains);
4112 nft_trans_destroy(trans);
4114 case NFT_MSG_NEWRULE:
4115 trans->ctx.chain->use--;
4116 list_del_rcu(&nft_trans_rule(trans)->list);
4118 case NFT_MSG_DELRULE:
4119 trans->ctx.chain->use++;
4120 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
4121 nft_trans_destroy(trans);
4123 case NFT_MSG_NEWSET:
4124 trans->ctx.table->use--;
4125 list_del_rcu(&nft_trans_set(trans)->list);
4127 case NFT_MSG_DELSET:
4128 trans->ctx.table->use++;
4129 list_add_tail_rcu(&nft_trans_set(trans)->list,
4130 &trans->ctx.table->sets);
4131 nft_trans_destroy(trans);
4133 case NFT_MSG_NEWSETELEM:
4134 te = (struct nft_trans_elem *)trans->data;
4136 te->set->ops->remove(te->set, &te->elem);
4137 atomic_dec(&te->set->nelems);
4139 case NFT_MSG_DELSETELEM:
4140 te = (struct nft_trans_elem *)trans->data;
4142 te->set->ops->activate(te->set, &te->elem);
4145 nft_trans_destroy(trans);
4152 list_for_each_entry_safe_reverse(trans, next,
4153 &net->nft.commit_list, list) {
4154 list_del(&trans->list);
4155 nf_tables_abort_release(trans);
4161 static const struct nfnetlink_subsystem nf_tables_subsys = {
4162 .name = "nf_tables",
4163 .subsys_id = NFNL_SUBSYS_NFTABLES,
4164 .cb_count = NFT_MSG_MAX,
4166 .commit = nf_tables_commit,
4167 .abort = nf_tables_abort,
4170 int nft_chain_validate_dependency(const struct nft_chain *chain,
4171 enum nft_chain_type type)
4173 const struct nft_base_chain *basechain;
4175 if (chain->flags & NFT_BASE_CHAIN) {
4176 basechain = nft_base_chain(chain);
4177 if (basechain->type->type != type)
4182 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
4184 int nft_chain_validate_hooks(const struct nft_chain *chain,
4185 unsigned int hook_flags)
4187 struct nft_base_chain *basechain;
4189 if (chain->flags & NFT_BASE_CHAIN) {
4190 basechain = nft_base_chain(chain);
4192 if ((1 << basechain->ops[0].hooknum) & hook_flags)
4200 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
4203 * Loop detection - walk through the ruleset beginning at the destination chain
4204 * of a new jump until either the source chain is reached (loop) or all
4205 * reachable chains have been traversed.
4207 * The loop check is performed whenever a new jump verdict is added to an
4208 * expression or verdict map or a verdict map is bound to a new chain.
4211 static int nf_tables_check_loops(const struct nft_ctx *ctx,
4212 const struct nft_chain *chain);
4214 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
4215 const struct nft_set *set,
4216 const struct nft_set_iter *iter,
4217 const struct nft_set_elem *elem)
4219 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4220 const struct nft_data *data;
4222 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4223 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
4226 data = nft_set_ext_data(ext);
4227 switch (data->verdict.code) {
4230 return nf_tables_check_loops(ctx, data->verdict.chain);
4236 static int nf_tables_check_loops(const struct nft_ctx *ctx,
4237 const struct nft_chain *chain)
4239 const struct nft_rule *rule;
4240 const struct nft_expr *expr, *last;
4241 const struct nft_set *set;
4242 struct nft_set_binding *binding;
4243 struct nft_set_iter iter;
4245 if (ctx->chain == chain)
4248 list_for_each_entry(rule, &chain->rules, list) {
4249 nft_rule_for_each_expr(expr, last, rule) {
4250 const struct nft_data *data = NULL;
4253 if (!expr->ops->validate)
4256 err = expr->ops->validate(ctx, expr, &data);
4263 switch (data->verdict.code) {
4266 err = nf_tables_check_loops(ctx,
4267 data->verdict.chain);
4276 list_for_each_entry(set, &ctx->table->sets, list) {
4277 if (!(set->flags & NFT_SET_MAP) ||
4278 set->dtype != NFT_DATA_VERDICT)
4281 list_for_each_entry(binding, &set->bindings, list) {
4282 if (!(binding->flags & NFT_SET_MAP) ||
4283 binding->chain != chain)
4286 iter.genmask = nft_genmask_next(ctx->net);
4290 iter.fn = nf_tables_loop_check_setelem;
4292 set->ops->walk(ctx, set, &iter);
4302 * nft_parse_register - parse a register value from a netlink attribute
4304 * @attr: netlink attribute
4306 * Parse and translate a register value from a netlink attribute.
4307 * Registers used to be 128 bit wide, these register numbers will be
4308 * mapped to the corresponding 32 bit register numbers.
4310 unsigned int nft_parse_register(const struct nlattr *attr)
4314 reg = ntohl(nla_get_be32(attr));
4316 case NFT_REG_VERDICT...NFT_REG_4:
4317 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
4319 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
4322 EXPORT_SYMBOL_GPL(nft_parse_register);
4325 * nft_dump_register - dump a register value to a netlink attribute
4327 * @skb: socket buffer
4328 * @attr: attribute number
4329 * @reg: register number
4331 * Construct a netlink attribute containing the register number. For
4332 * compatibility reasons, register numbers being a multiple of 4 are
4333 * translated to the corresponding 128 bit register numbers.
4335 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
4337 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
4338 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
4340 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
4342 return nla_put_be32(skb, attr, htonl(reg));
4344 EXPORT_SYMBOL_GPL(nft_dump_register);
4347 * nft_validate_register_load - validate a load from a register
4349 * @reg: the register number
4350 * @len: the length of the data
4352 * Validate that the input register is one of the general purpose
4353 * registers and that the length of the load is within the bounds.
4355 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
4357 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
4361 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
4366 EXPORT_SYMBOL_GPL(nft_validate_register_load);
4369 * nft_validate_register_store - validate an expressions' register store
4371 * @ctx: context of the expression performing the load
4372 * @reg: the destination register number
4373 * @data: the data to load
4374 * @type: the data type
4375 * @len: the length of the data
4377 * Validate that a data load uses the appropriate data type for
4378 * the destination register and the length is within the bounds.
4379 * A value of NULL for the data means that its runtime gathered
4382 int nft_validate_register_store(const struct nft_ctx *ctx,
4383 enum nft_registers reg,
4384 const struct nft_data *data,
4385 enum nft_data_types type, unsigned int len)
4390 case NFT_REG_VERDICT:
4391 if (type != NFT_DATA_VERDICT)
4395 (data->verdict.code == NFT_GOTO ||
4396 data->verdict.code == NFT_JUMP)) {
4397 err = nf_tables_check_loops(ctx, data->verdict.chain);
4401 if (ctx->chain->level + 1 >
4402 data->verdict.chain->level) {
4403 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
4405 data->verdict.chain->level = ctx->chain->level + 1;
4411 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
4415 if (reg * NFT_REG32_SIZE + len >
4416 FIELD_SIZEOF(struct nft_regs, data))
4419 if (data != NULL && type != NFT_DATA_VALUE)
4424 EXPORT_SYMBOL_GPL(nft_validate_register_store);
4426 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
4427 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
4428 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
4429 .len = NFT_CHAIN_MAXNAMELEN - 1 },
4432 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
4433 struct nft_data_desc *desc, const struct nlattr *nla)
4435 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
4436 struct nft_chain *chain;
4439 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
4443 if (!tb[NFTA_VERDICT_CODE])
4445 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
4447 switch (data->verdict.code) {
4449 switch (data->verdict.code & NF_VERDICT_MASK) {
4464 if (!tb[NFTA_VERDICT_CHAIN])
4466 chain = nf_tables_chain_lookup(ctx->table,
4467 tb[NFTA_VERDICT_CHAIN]);
4469 return PTR_ERR(chain);
4470 if (chain->flags & NFT_BASE_CHAIN)
4474 data->verdict.chain = chain;
4478 desc->len = sizeof(data->verdict);
4479 desc->type = NFT_DATA_VERDICT;
4483 static void nft_verdict_uninit(const struct nft_data *data)
4485 switch (data->verdict.code) {
4488 data->verdict.chain->use--;
4493 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
4495 struct nlattr *nest;
4497 nest = nla_nest_start(skb, type);
4499 goto nla_put_failure;
4501 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
4502 goto nla_put_failure;
4507 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
4509 goto nla_put_failure;
4511 nla_nest_end(skb, nest);
4518 static int nft_value_init(const struct nft_ctx *ctx,
4519 struct nft_data *data, unsigned int size,
4520 struct nft_data_desc *desc, const struct nlattr *nla)
4530 nla_memcpy(data->data, nla, len);
4531 desc->type = NFT_DATA_VALUE;
4536 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
4539 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
4542 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
4543 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
4544 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
4548 * nft_data_init - parse nf_tables data netlink attributes
4550 * @ctx: context of the expression using the data
4551 * @data: destination struct nft_data
4552 * @size: maximum data length
4553 * @desc: data description
4554 * @nla: netlink attribute containing data
4556 * Parse the netlink data attributes and initialize a struct nft_data.
4557 * The type and length of data are returned in the data description.
4559 * The caller can indicate that it only wants to accept data of type
4560 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4562 int nft_data_init(const struct nft_ctx *ctx,
4563 struct nft_data *data, unsigned int size,
4564 struct nft_data_desc *desc, const struct nlattr *nla)
4566 struct nlattr *tb[NFTA_DATA_MAX + 1];
4569 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
4573 if (tb[NFTA_DATA_VALUE])
4574 return nft_value_init(ctx, data, size, desc,
4575 tb[NFTA_DATA_VALUE]);
4576 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
4577 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
4580 EXPORT_SYMBOL_GPL(nft_data_init);
4583 * nft_data_uninit - release a nft_data item
4585 * @data: struct nft_data to release
4586 * @type: type of data
4588 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4589 * all others need to be released by calling this function.
4591 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
4593 if (type < NFT_DATA_VERDICT)
4596 case NFT_DATA_VERDICT:
4597 return nft_verdict_uninit(data);
4602 EXPORT_SYMBOL_GPL(nft_data_uninit);
4604 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4605 enum nft_data_types type, unsigned int len)
4607 struct nlattr *nest;
4610 nest = nla_nest_start(skb, attr);
4615 case NFT_DATA_VALUE:
4616 err = nft_value_dump(skb, data, len);
4618 case NFT_DATA_VERDICT:
4619 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
4626 nla_nest_end(skb, nest);
4629 EXPORT_SYMBOL_GPL(nft_data_dump);
4631 static int __net_init nf_tables_init_net(struct net *net)
4633 INIT_LIST_HEAD(&net->nft.af_info);
4634 INIT_LIST_HEAD(&net->nft.commit_list);
4635 net->nft.base_seq = 1;
4639 int __nft_release_basechain(struct nft_ctx *ctx)
4641 struct nft_rule *rule, *nr;
4643 BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
4645 nf_tables_unregister_hooks(ctx->chain->table, ctx->chain,
4647 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
4648 list_del(&rule->list);
4650 nf_tables_rule_destroy(ctx, rule);
4652 list_del(&ctx->chain->list);
4654 nf_tables_chain_destroy(ctx->chain);
4658 EXPORT_SYMBOL_GPL(__nft_release_basechain);
4660 /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
4661 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
4663 struct nft_table *table, *nt;
4664 struct nft_chain *chain, *nc;
4665 struct nft_rule *rule, *nr;
4666 struct nft_set *set, *ns;
4667 struct nft_ctx ctx = {
4672 list_for_each_entry_safe(table, nt, &afi->tables, list) {
4673 list_for_each_entry(chain, &table->chains, list)
4674 nf_tables_unregister_hooks(table, chain, afi->nops);
4675 /* No packets are walking on these chains anymore. */
4677 list_for_each_entry(chain, &table->chains, list) {
4679 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
4680 list_del(&rule->list);
4682 nf_tables_rule_destroy(&ctx, rule);
4685 list_for_each_entry_safe(set, ns, &table->sets, list) {
4686 list_del(&set->list);
4688 nft_set_destroy(set);
4690 list_for_each_entry_safe(chain, nc, &table->chains, list) {
4691 list_del(&chain->list);
4693 nf_tables_chain_destroy(chain);
4695 list_del(&table->list);
4696 nf_tables_table_destroy(&ctx);
4700 static struct pernet_operations nf_tables_net_ops = {
4701 .init = nf_tables_init_net,
4704 static int __init nf_tables_module_init(void)
4708 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4715 err = nf_tables_core_module_init();
4719 err = nfnetlink_subsys_register(&nf_tables_subsys);
4723 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4724 return register_pernet_subsys(&nf_tables_net_ops);
4726 nf_tables_core_module_exit();
4733 static void __exit nf_tables_module_exit(void)
4735 unregister_pernet_subsys(&nf_tables_net_ops);
4736 nfnetlink_subsys_unregister(&nf_tables_subsys);
4738 nf_tables_core_module_exit();
4742 module_init(nf_tables_module_init);
4743 module_exit(nf_tables_module_exit);
4745 MODULE_LICENSE("GPL");
4746 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4747 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);