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);
45 * nft_unregister_afinfo - unregister nf_tables address family info
47 * @afi: address family info to unregister
49 * Unregister the address family for use with nf_tables.
51 void nft_unregister_afinfo(struct nft_af_info *afi)
53 nfnl_lock(NFNL_SUBSYS_NFTABLES);
54 list_del_rcu(&afi->list);
55 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
57 EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
59 static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
61 struct nft_af_info *afi;
63 list_for_each_entry(afi, &net->nft.af_info, list) {
64 if (afi->family == family)
70 static struct nft_af_info *
71 nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
73 struct nft_af_info *afi;
75 afi = nft_afinfo_lookup(net, family);
80 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
81 request_module("nft-afinfo-%u", family);
82 nfnl_lock(NFNL_SUBSYS_NFTABLES);
83 afi = nft_afinfo_lookup(net, family);
85 return ERR_PTR(-EAGAIN);
88 return ERR_PTR(-EAFNOSUPPORT);
91 static void nft_ctx_init(struct nft_ctx *ctx,
92 const struct sk_buff *skb,
93 const struct nlmsghdr *nlh,
94 struct nft_af_info *afi,
95 struct nft_table *table,
96 struct nft_chain *chain,
97 const struct nlattr * const *nla)
99 ctx->net = sock_net(skb->sk);
104 ctx->portid = NETLINK_CB(skb).portid;
105 ctx->report = nlmsg_report(nlh);
106 ctx->seq = nlh->nlmsg_seq;
109 static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type,
112 struct nft_trans *trans;
114 trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL);
118 trans->msg_type = msg_type;
124 static void nft_trans_destroy(struct nft_trans *trans)
126 list_del(&trans->list);
130 static void nf_tables_unregister_hooks(const struct nft_table *table,
131 const struct nft_chain *chain,
132 unsigned int hook_nops)
134 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
135 chain->flags & NFT_BASE_CHAIN)
136 nf_unregister_hooks(nft_base_chain(chain)->ops, hook_nops);
139 /* Internal table flags */
140 #define NFT_TABLE_INACTIVE (1 << 15)
142 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
144 struct nft_trans *trans;
146 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
150 if (msg_type == NFT_MSG_NEWTABLE)
151 ctx->table->flags |= NFT_TABLE_INACTIVE;
153 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
157 static int nft_deltable(struct nft_ctx *ctx)
161 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
165 list_del_rcu(&ctx->table->list);
169 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
171 struct nft_trans *trans;
173 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
177 if (msg_type == NFT_MSG_NEWCHAIN)
178 ctx->chain->flags |= NFT_CHAIN_INACTIVE;
180 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
184 static int nft_delchain(struct nft_ctx *ctx)
188 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
193 list_del_rcu(&ctx->chain->list);
199 nft_rule_is_active(struct net *net, const struct nft_rule *rule)
201 return (rule->genmask & (1 << net->nft.gencursor)) == 0;
204 static inline int gencursor_next(struct net *net)
206 return net->nft.gencursor+1 == 1 ? 1 : 0;
210 nft_rule_is_active_next(struct net *net, const struct nft_rule *rule)
212 return (rule->genmask & (1 << gencursor_next(net))) == 0;
216 nft_rule_activate_next(struct net *net, struct nft_rule *rule)
218 /* Now inactive, will be active in the future */
219 rule->genmask = (1 << net->nft.gencursor);
223 nft_rule_deactivate_next(struct net *net, struct nft_rule *rule)
225 rule->genmask = (1 << gencursor_next(net));
228 static inline void nft_rule_clear(struct net *net, struct nft_rule *rule)
234 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
236 /* You cannot delete the same rule twice */
237 if (nft_rule_is_active_next(ctx->net, rule)) {
238 nft_rule_deactivate_next(ctx->net, rule);
245 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
246 struct nft_rule *rule)
248 struct nft_trans *trans;
250 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
254 nft_trans_rule(trans) = rule;
255 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
260 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
262 struct nft_trans *trans;
265 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
269 err = nf_tables_delrule_deactivate(ctx, rule);
271 nft_trans_destroy(trans);
278 static int nft_delrule_by_chain(struct nft_ctx *ctx)
280 struct nft_rule *rule;
283 list_for_each_entry(rule, &ctx->chain->rules, list) {
284 err = nft_delrule(ctx, rule);
291 /* Internal set flag */
292 #define NFT_SET_INACTIVE (1 << 15)
294 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
297 struct nft_trans *trans;
299 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
303 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
304 nft_trans_set_id(trans) =
305 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
306 set->flags |= NFT_SET_INACTIVE;
308 nft_trans_set(trans) = set;
309 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
314 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
318 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
322 list_del_rcu(&set->list);
332 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
333 const struct nlattr *nla)
335 struct nft_table *table;
337 list_for_each_entry(table, &afi->tables, list) {
338 if (!nla_strcmp(nla, table->name))
344 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
345 const struct nlattr *nla)
347 struct nft_table *table;
350 return ERR_PTR(-EINVAL);
352 table = nft_table_lookup(afi, nla);
356 return ERR_PTR(-ENOENT);
359 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
361 return ++table->hgenerator;
364 static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
366 static const struct nf_chain_type *
367 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
371 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
372 if (chain_type[family][i] != NULL &&
373 !nla_strcmp(nla, chain_type[family][i]->name))
374 return chain_type[family][i];
379 static const struct nf_chain_type *
380 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
381 const struct nlattr *nla,
384 const struct nf_chain_type *type;
386 type = __nf_tables_chain_type_lookup(afi->family, nla);
389 #ifdef CONFIG_MODULES
391 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
392 request_module("nft-chain-%u-%.*s", afi->family,
393 nla_len(nla), (const char *)nla_data(nla));
394 nfnl_lock(NFNL_SUBSYS_NFTABLES);
395 type = __nf_tables_chain_type_lookup(afi->family, nla);
397 return ERR_PTR(-EAGAIN);
400 return ERR_PTR(-ENOENT);
403 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
404 [NFTA_TABLE_NAME] = { .type = NLA_STRING },
405 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
408 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
409 u32 portid, u32 seq, int event, u32 flags,
410 int family, const struct nft_table *table)
412 struct nlmsghdr *nlh;
413 struct nfgenmsg *nfmsg;
415 event |= NFNL_SUBSYS_NFTABLES << 8;
416 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
418 goto nla_put_failure;
420 nfmsg = nlmsg_data(nlh);
421 nfmsg->nfgen_family = family;
422 nfmsg->version = NFNETLINK_V0;
423 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
425 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
426 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
427 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
428 goto nla_put_failure;
430 return nlmsg_end(skb, nlh);
433 nlmsg_trim(skb, nlh);
437 static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
443 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
447 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
451 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
452 event, 0, ctx->afi->family, ctx->table);
458 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
459 ctx->report, GFP_KERNEL);
462 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
468 static int nf_tables_dump_tables(struct sk_buff *skb,
469 struct netlink_callback *cb)
471 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
472 const struct nft_af_info *afi;
473 const struct nft_table *table;
474 unsigned int idx = 0, s_idx = cb->args[0];
475 struct net *net = sock_net(skb->sk);
476 int family = nfmsg->nfgen_family;
479 cb->seq = net->nft.base_seq;
481 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
482 if (family != NFPROTO_UNSPEC && family != afi->family)
485 list_for_each_entry_rcu(table, &afi->tables, list) {
489 memset(&cb->args[1], 0,
490 sizeof(cb->args) - sizeof(cb->args[0]));
491 if (nf_tables_fill_table_info(skb, net,
492 NETLINK_CB(cb->skb).portid,
496 afi->family, table) < 0)
499 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
510 static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb,
511 const struct nlmsghdr *nlh,
512 const struct nlattr * const nla[])
514 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
515 const struct nft_af_info *afi;
516 const struct nft_table *table;
517 struct sk_buff *skb2;
518 struct net *net = sock_net(skb->sk);
519 int family = nfmsg->nfgen_family;
522 if (nlh->nlmsg_flags & NLM_F_DUMP) {
523 struct netlink_dump_control c = {
524 .dump = nf_tables_dump_tables,
526 return netlink_dump_start(nlsk, skb, nlh, &c);
529 afi = nf_tables_afinfo_lookup(net, family, false);
533 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
535 return PTR_ERR(table);
536 if (table->flags & NFT_TABLE_INACTIVE)
539 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
543 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
544 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
549 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
556 static int nf_tables_table_enable(const struct nft_af_info *afi,
557 struct nft_table *table)
559 struct nft_chain *chain;
562 list_for_each_entry(chain, &table->chains, list) {
563 if (!(chain->flags & NFT_BASE_CHAIN))
566 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
574 list_for_each_entry(chain, &table->chains, list) {
575 if (!(chain->flags & NFT_BASE_CHAIN))
581 nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops);
586 static void nf_tables_table_disable(const struct nft_af_info *afi,
587 struct nft_table *table)
589 struct nft_chain *chain;
591 list_for_each_entry(chain, &table->chains, list) {
592 if (chain->flags & NFT_BASE_CHAIN)
593 nf_unregister_hooks(nft_base_chain(chain)->ops,
598 static int nf_tables_updtable(struct nft_ctx *ctx)
600 struct nft_trans *trans;
604 if (!ctx->nla[NFTA_TABLE_FLAGS])
607 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
608 if (flags & ~NFT_TABLE_F_DORMANT)
611 if (flags == ctx->table->flags)
614 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
615 sizeof(struct nft_trans_table));
619 if ((flags & NFT_TABLE_F_DORMANT) &&
620 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
621 nft_trans_table_enable(trans) = false;
622 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
623 ctx->table->flags & NFT_TABLE_F_DORMANT) {
624 ret = nf_tables_table_enable(ctx->afi, ctx->table);
626 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
627 nft_trans_table_enable(trans) = true;
633 nft_trans_table_update(trans) = true;
634 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
637 nft_trans_destroy(trans);
641 static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
642 const struct nlmsghdr *nlh,
643 const struct nlattr * const nla[])
645 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
646 const struct nlattr *name;
647 struct nft_af_info *afi;
648 struct nft_table *table;
649 struct net *net = sock_net(skb->sk);
650 int family = nfmsg->nfgen_family;
655 afi = nf_tables_afinfo_lookup(net, family, true);
659 name = nla[NFTA_TABLE_NAME];
660 table = nf_tables_table_lookup(afi, name);
662 if (PTR_ERR(table) != -ENOENT)
663 return PTR_ERR(table);
668 if (table->flags & NFT_TABLE_INACTIVE)
670 if (nlh->nlmsg_flags & NLM_F_EXCL)
672 if (nlh->nlmsg_flags & NLM_F_REPLACE)
675 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
676 return nf_tables_updtable(&ctx);
679 if (nla[NFTA_TABLE_FLAGS]) {
680 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
681 if (flags & ~NFT_TABLE_F_DORMANT)
685 if (!try_module_get(afi->owner))
686 return -EAFNOSUPPORT;
688 table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL);
690 module_put(afi->owner);
694 nla_strlcpy(table->name, name, nla_len(name));
695 INIT_LIST_HEAD(&table->chains);
696 INIT_LIST_HEAD(&table->sets);
697 table->flags = flags;
699 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
700 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
703 module_put(afi->owner);
706 list_add_tail_rcu(&table->list, &afi->tables);
710 static int nft_flush_table(struct nft_ctx *ctx)
713 struct nft_chain *chain, *nc;
714 struct nft_set *set, *ns;
716 list_for_each_entry(chain, &ctx->table->chains, list) {
719 err = nft_delrule_by_chain(ctx);
724 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
725 if (set->flags & NFT_SET_ANONYMOUS &&
726 !list_empty(&set->bindings))
729 err = nft_delset(ctx, set);
734 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
737 err = nft_delchain(ctx);
742 err = nft_deltable(ctx);
747 static int nft_flush(struct nft_ctx *ctx, int family)
749 struct nft_af_info *afi;
750 struct nft_table *table, *nt;
751 const struct nlattr * const *nla = ctx->nla;
754 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
755 if (family != AF_UNSPEC && afi->family != family)
759 list_for_each_entry_safe(table, nt, &afi->tables, list) {
760 if (nla[NFTA_TABLE_NAME] &&
761 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
766 err = nft_flush_table(ctx);
775 static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb,
776 const struct nlmsghdr *nlh,
777 const struct nlattr * const nla[])
779 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
780 struct nft_af_info *afi;
781 struct nft_table *table;
782 struct net *net = sock_net(skb->sk);
783 int family = nfmsg->nfgen_family;
786 nft_ctx_init(&ctx, skb, nlh, NULL, NULL, NULL, nla);
787 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
788 return nft_flush(&ctx, family);
790 afi = nf_tables_afinfo_lookup(net, family, false);
794 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
796 return PTR_ERR(table);
797 if (table->flags & NFT_TABLE_INACTIVE)
803 return nft_flush_table(&ctx);
806 static void nf_tables_table_destroy(struct nft_ctx *ctx)
808 BUG_ON(ctx->table->use > 0);
811 module_put(ctx->afi->owner);
814 int nft_register_chain_type(const struct nf_chain_type *ctype)
818 nfnl_lock(NFNL_SUBSYS_NFTABLES);
819 if (chain_type[ctype->family][ctype->type] != NULL) {
823 chain_type[ctype->family][ctype->type] = ctype;
825 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
828 EXPORT_SYMBOL_GPL(nft_register_chain_type);
830 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
832 nfnl_lock(NFNL_SUBSYS_NFTABLES);
833 chain_type[ctype->family][ctype->type] = NULL;
834 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
836 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
842 static struct nft_chain *
843 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
845 struct nft_chain *chain;
847 list_for_each_entry(chain, &table->chains, list) {
848 if (chain->handle == handle)
852 return ERR_PTR(-ENOENT);
855 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
856 const struct nlattr *nla)
858 struct nft_chain *chain;
861 return ERR_PTR(-EINVAL);
863 list_for_each_entry(chain, &table->chains, list) {
864 if (!nla_strcmp(nla, chain->name))
868 return ERR_PTR(-ENOENT);
871 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
872 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
873 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
874 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
875 .len = NFT_CHAIN_MAXNAMELEN - 1 },
876 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
877 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
878 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
879 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
882 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
883 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
884 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
887 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
889 struct nft_stats *cpu_stats, total;
895 memset(&total, 0, sizeof(total));
896 for_each_possible_cpu(cpu) {
897 cpu_stats = per_cpu_ptr(stats, cpu);
899 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
900 pkts = cpu_stats->pkts;
901 bytes = cpu_stats->bytes;
902 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
904 total.bytes += bytes;
906 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
908 goto nla_put_failure;
910 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) ||
911 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes)))
912 goto nla_put_failure;
914 nla_nest_end(skb, nest);
921 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
922 u32 portid, u32 seq, int event, u32 flags,
923 int family, const struct nft_table *table,
924 const struct nft_chain *chain)
926 struct nlmsghdr *nlh;
927 struct nfgenmsg *nfmsg;
929 event |= NFNL_SUBSYS_NFTABLES << 8;
930 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
932 goto nla_put_failure;
934 nfmsg = nlmsg_data(nlh);
935 nfmsg->nfgen_family = family;
936 nfmsg->version = NFNETLINK_V0;
937 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
939 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
940 goto nla_put_failure;
941 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle)))
942 goto nla_put_failure;
943 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
944 goto nla_put_failure;
946 if (chain->flags & NFT_BASE_CHAIN) {
947 const struct nft_base_chain *basechain = nft_base_chain(chain);
948 const struct nf_hook_ops *ops = &basechain->ops[0];
951 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
953 goto nla_put_failure;
954 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
955 goto nla_put_failure;
956 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
957 goto nla_put_failure;
958 nla_nest_end(skb, nest);
960 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
961 htonl(basechain->policy)))
962 goto nla_put_failure;
964 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
965 goto nla_put_failure;
967 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
968 goto nla_put_failure;
971 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
972 goto nla_put_failure;
974 return nlmsg_end(skb, nlh);
977 nlmsg_trim(skb, nlh);
981 static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
987 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
991 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
995 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
996 event, 0, ctx->afi->family, ctx->table,
1003 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1004 ctx->report, GFP_KERNEL);
1007 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1013 static int nf_tables_dump_chains(struct sk_buff *skb,
1014 struct netlink_callback *cb)
1016 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1017 const struct nft_af_info *afi;
1018 const struct nft_table *table;
1019 const struct nft_chain *chain;
1020 unsigned int idx = 0, s_idx = cb->args[0];
1021 struct net *net = sock_net(skb->sk);
1022 int family = nfmsg->nfgen_family;
1025 cb->seq = net->nft.base_seq;
1027 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1028 if (family != NFPROTO_UNSPEC && family != afi->family)
1031 list_for_each_entry_rcu(table, &afi->tables, list) {
1032 list_for_each_entry_rcu(chain, &table->chains, list) {
1036 memset(&cb->args[1], 0,
1037 sizeof(cb->args) - sizeof(cb->args[0]));
1038 if (nf_tables_fill_chain_info(skb, net,
1039 NETLINK_CB(cb->skb).portid,
1043 afi->family, table, chain) < 0)
1046 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1058 static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb,
1059 const struct nlmsghdr *nlh,
1060 const struct nlattr * const nla[])
1062 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1063 const struct nft_af_info *afi;
1064 const struct nft_table *table;
1065 const struct nft_chain *chain;
1066 struct sk_buff *skb2;
1067 struct net *net = sock_net(skb->sk);
1068 int family = nfmsg->nfgen_family;
1071 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1072 struct netlink_dump_control c = {
1073 .dump = nf_tables_dump_chains,
1075 return netlink_dump_start(nlsk, skb, nlh, &c);
1078 afi = nf_tables_afinfo_lookup(net, family, false);
1080 return PTR_ERR(afi);
1082 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1084 return PTR_ERR(table);
1085 if (table->flags & NFT_TABLE_INACTIVE)
1088 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1090 return PTR_ERR(chain);
1091 if (chain->flags & NFT_CHAIN_INACTIVE)
1094 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1098 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1099 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1100 family, table, chain);
1104 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1111 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1112 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1113 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1116 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1118 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1119 struct nft_stats __percpu *newstats;
1120 struct nft_stats *stats;
1123 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1125 return ERR_PTR(err);
1127 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1128 return ERR_PTR(-EINVAL);
1130 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1131 if (newstats == NULL)
1132 return ERR_PTR(-ENOMEM);
1134 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1135 * are not exposed to userspace.
1137 stats = this_cpu_ptr(newstats);
1138 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1139 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1144 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1145 struct nft_stats __percpu *newstats)
1147 if (newstats == NULL)
1151 struct nft_stats __percpu *oldstats =
1152 nft_dereference(chain->stats);
1154 rcu_assign_pointer(chain->stats, newstats);
1156 free_percpu(oldstats);
1158 rcu_assign_pointer(chain->stats, newstats);
1161 static void nf_tables_chain_destroy(struct nft_chain *chain)
1163 BUG_ON(chain->use > 0);
1165 if (chain->flags & NFT_BASE_CHAIN) {
1166 module_put(nft_base_chain(chain)->type->owner);
1167 free_percpu(nft_base_chain(chain)->stats);
1168 kfree(nft_base_chain(chain));
1174 static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
1175 const struct nlmsghdr *nlh,
1176 const struct nlattr * const nla[])
1178 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1179 const struct nlattr * uninitialized_var(name);
1180 struct nft_af_info *afi;
1181 struct nft_table *table;
1182 struct nft_chain *chain;
1183 struct nft_base_chain *basechain = NULL;
1184 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1185 struct net *net = sock_net(skb->sk);
1186 int family = nfmsg->nfgen_family;
1187 u8 policy = NF_ACCEPT;
1190 struct nft_stats __percpu *stats;
1195 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1197 afi = nf_tables_afinfo_lookup(net, family, true);
1199 return PTR_ERR(afi);
1201 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1203 return PTR_ERR(table);
1206 name = nla[NFTA_CHAIN_NAME];
1208 if (nla[NFTA_CHAIN_HANDLE]) {
1209 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1210 chain = nf_tables_chain_lookup_byhandle(table, handle);
1212 return PTR_ERR(chain);
1214 chain = nf_tables_chain_lookup(table, name);
1215 if (IS_ERR(chain)) {
1216 if (PTR_ERR(chain) != -ENOENT)
1217 return PTR_ERR(chain);
1222 if (nla[NFTA_CHAIN_POLICY]) {
1223 if ((chain != NULL &&
1224 !(chain->flags & NFT_BASE_CHAIN)) ||
1225 nla[NFTA_CHAIN_HOOK] == NULL)
1228 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1238 if (chain != NULL) {
1239 struct nft_stats *stats = NULL;
1240 struct nft_trans *trans;
1242 if (chain->flags & NFT_CHAIN_INACTIVE)
1244 if (nlh->nlmsg_flags & NLM_F_EXCL)
1246 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1249 if (nla[NFTA_CHAIN_HANDLE] && name &&
1250 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
1253 if (nla[NFTA_CHAIN_COUNTERS]) {
1254 if (!(chain->flags & NFT_BASE_CHAIN))
1257 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1259 return PTR_ERR(stats);
1262 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1263 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1264 sizeof(struct nft_trans_chain));
1268 nft_trans_chain_stats(trans) = stats;
1269 nft_trans_chain_update(trans) = true;
1271 if (nla[NFTA_CHAIN_POLICY])
1272 nft_trans_chain_policy(trans) = policy;
1274 nft_trans_chain_policy(trans) = -1;
1276 if (nla[NFTA_CHAIN_HANDLE] && name) {
1277 nla_strlcpy(nft_trans_chain_name(trans), name,
1278 NFT_CHAIN_MAXNAMELEN);
1280 list_add_tail(&trans->list, &net->nft.commit_list);
1284 if (table->use == UINT_MAX)
1287 if (nla[NFTA_CHAIN_HOOK]) {
1288 const struct nf_chain_type *type;
1289 struct nf_hook_ops *ops;
1291 u32 hooknum, priority;
1293 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1294 if (nla[NFTA_CHAIN_TYPE]) {
1295 type = nf_tables_chain_type_lookup(afi,
1296 nla[NFTA_CHAIN_TYPE],
1299 return PTR_ERR(type);
1302 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1306 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1307 ha[NFTA_HOOK_PRIORITY] == NULL)
1310 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1311 if (hooknum >= afi->nhooks)
1313 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1315 if (!(type->hook_mask & (1 << hooknum)))
1317 if (!try_module_get(type->owner))
1319 hookfn = type->hooks[hooknum];
1321 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1322 if (basechain == NULL)
1325 if (nla[NFTA_CHAIN_COUNTERS]) {
1326 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1327 if (IS_ERR(stats)) {
1328 module_put(type->owner);
1330 return PTR_ERR(stats);
1332 basechain->stats = stats;
1334 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1335 if (stats == NULL) {
1336 module_put(type->owner);
1340 rcu_assign_pointer(basechain->stats, stats);
1343 basechain->type = type;
1344 chain = &basechain->chain;
1346 for (i = 0; i < afi->nops; i++) {
1347 ops = &basechain->ops[i];
1349 ops->owner = afi->owner;
1350 ops->hooknum = hooknum;
1351 ops->priority = priority;
1353 ops->hook = afi->hooks[ops->hooknum];
1356 if (afi->hook_ops_init)
1357 afi->hook_ops_init(ops, i);
1360 chain->flags |= NFT_BASE_CHAIN;
1361 basechain->policy = policy;
1363 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1368 INIT_LIST_HEAD(&chain->rules);
1369 chain->handle = nf_tables_alloc_handle(table);
1371 chain->table = table;
1372 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1374 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1375 chain->flags & NFT_BASE_CHAIN) {
1376 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
1381 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1382 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1387 list_add_tail_rcu(&chain->list, &table->chains);
1390 nf_tables_unregister_hooks(table, chain, afi->nops);
1392 nf_tables_chain_destroy(chain);
1396 static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
1397 const struct nlmsghdr *nlh,
1398 const struct nlattr * const nla[])
1400 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1401 struct nft_af_info *afi;
1402 struct nft_table *table;
1403 struct nft_chain *chain;
1404 struct net *net = sock_net(skb->sk);
1405 int family = nfmsg->nfgen_family;
1408 afi = nf_tables_afinfo_lookup(net, family, false);
1410 return PTR_ERR(afi);
1412 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1414 return PTR_ERR(table);
1415 if (table->flags & NFT_TABLE_INACTIVE)
1418 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1420 return PTR_ERR(chain);
1421 if (chain->flags & NFT_CHAIN_INACTIVE)
1426 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1428 return nft_delchain(&ctx);
1436 * nft_register_expr - register nf_tables expr type
1439 * Registers the expr type for use with nf_tables. Returns zero on
1440 * success or a negative errno code otherwise.
1442 int nft_register_expr(struct nft_expr_type *type)
1444 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1445 if (type->family == NFPROTO_UNSPEC)
1446 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1448 list_add_rcu(&type->list, &nf_tables_expressions);
1449 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1452 EXPORT_SYMBOL_GPL(nft_register_expr);
1455 * nft_unregister_expr - unregister nf_tables expr type
1458 * Unregisters the expr typefor use with nf_tables.
1460 void nft_unregister_expr(struct nft_expr_type *type)
1462 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1463 list_del_rcu(&type->list);
1464 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1466 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1468 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1471 const struct nft_expr_type *type;
1473 list_for_each_entry(type, &nf_tables_expressions, list) {
1474 if (!nla_strcmp(nla, type->name) &&
1475 (!type->family || type->family == family))
1481 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1484 const struct nft_expr_type *type;
1487 return ERR_PTR(-EINVAL);
1489 type = __nft_expr_type_get(family, nla);
1490 if (type != NULL && try_module_get(type->owner))
1493 #ifdef CONFIG_MODULES
1495 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1496 request_module("nft-expr-%u-%.*s", family,
1497 nla_len(nla), (char *)nla_data(nla));
1498 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1499 if (__nft_expr_type_get(family, nla))
1500 return ERR_PTR(-EAGAIN);
1502 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1503 request_module("nft-expr-%.*s",
1504 nla_len(nla), (char *)nla_data(nla));
1505 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1506 if (__nft_expr_type_get(family, nla))
1507 return ERR_PTR(-EAGAIN);
1510 return ERR_PTR(-ENOENT);
1513 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1514 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1515 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1518 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1519 const struct nft_expr *expr)
1521 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1522 goto nla_put_failure;
1524 if (expr->ops->dump) {
1525 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1527 goto nla_put_failure;
1528 if (expr->ops->dump(skb, expr) < 0)
1529 goto nla_put_failure;
1530 nla_nest_end(skb, data);
1539 struct nft_expr_info {
1540 const struct nft_expr_ops *ops;
1541 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1544 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1545 const struct nlattr *nla,
1546 struct nft_expr_info *info)
1548 const struct nft_expr_type *type;
1549 const struct nft_expr_ops *ops;
1550 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1553 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1557 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1559 return PTR_ERR(type);
1561 if (tb[NFTA_EXPR_DATA]) {
1562 err = nla_parse_nested(info->tb, type->maxattr,
1563 tb[NFTA_EXPR_DATA], type->policy);
1567 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1569 if (type->select_ops != NULL) {
1570 ops = type->select_ops(ctx,
1571 (const struct nlattr * const *)info->tb);
1583 module_put(type->owner);
1587 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1588 const struct nft_expr_info *info,
1589 struct nft_expr *expr)
1591 const struct nft_expr_ops *ops = info->ops;
1596 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1608 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1609 struct nft_expr *expr)
1611 if (expr->ops->destroy)
1612 expr->ops->destroy(ctx, expr);
1613 module_put(expr->ops->type->owner);
1620 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1623 struct nft_rule *rule;
1625 // FIXME: this sucks
1626 list_for_each_entry(rule, &chain->rules, list) {
1627 if (handle == rule->handle)
1631 return ERR_PTR(-ENOENT);
1634 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1635 const struct nlattr *nla)
1638 return ERR_PTR(-EINVAL);
1640 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1643 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1644 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1645 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1646 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1647 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1648 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1649 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1650 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1651 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1652 .len = NFT_USERDATA_MAXLEN },
1655 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1656 u32 portid, u32 seq, int event,
1657 u32 flags, int family,
1658 const struct nft_table *table,
1659 const struct nft_chain *chain,
1660 const struct nft_rule *rule)
1662 struct nlmsghdr *nlh;
1663 struct nfgenmsg *nfmsg;
1664 const struct nft_expr *expr, *next;
1665 struct nlattr *list;
1666 const struct nft_rule *prule;
1667 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1669 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1672 goto nla_put_failure;
1674 nfmsg = nlmsg_data(nlh);
1675 nfmsg->nfgen_family = family;
1676 nfmsg->version = NFNETLINK_V0;
1677 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1679 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1680 goto nla_put_failure;
1681 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1682 goto nla_put_failure;
1683 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle)))
1684 goto nla_put_failure;
1686 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1687 prule = list_entry(rule->list.prev, struct nft_rule, list);
1688 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1689 cpu_to_be64(prule->handle)))
1690 goto nla_put_failure;
1693 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1695 goto nla_put_failure;
1696 nft_rule_for_each_expr(expr, next, rule) {
1697 struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM);
1699 goto nla_put_failure;
1700 if (nf_tables_fill_expr_info(skb, expr) < 0)
1701 goto nla_put_failure;
1702 nla_nest_end(skb, elem);
1704 nla_nest_end(skb, list);
1707 nla_put(skb, NFTA_RULE_USERDATA, rule->ulen, nft_userdata(rule)))
1708 goto nla_put_failure;
1710 return nlmsg_end(skb, nlh);
1713 nlmsg_trim(skb, nlh);
1717 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1718 const struct nft_rule *rule,
1721 struct sk_buff *skb;
1725 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1729 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1733 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1734 event, 0, ctx->afi->family, ctx->table,
1741 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1742 ctx->report, GFP_KERNEL);
1745 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1751 static int nf_tables_dump_rules(struct sk_buff *skb,
1752 struct netlink_callback *cb)
1754 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1755 const struct nft_af_info *afi;
1756 const struct nft_table *table;
1757 const struct nft_chain *chain;
1758 const struct nft_rule *rule;
1759 unsigned int idx = 0, s_idx = cb->args[0];
1760 struct net *net = sock_net(skb->sk);
1761 int family = nfmsg->nfgen_family;
1764 cb->seq = net->nft.base_seq;
1766 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1767 if (family != NFPROTO_UNSPEC && family != afi->family)
1770 list_for_each_entry_rcu(table, &afi->tables, list) {
1771 list_for_each_entry_rcu(chain, &table->chains, list) {
1772 list_for_each_entry_rcu(rule, &chain->rules, list) {
1773 if (!nft_rule_is_active(net, rule))
1778 memset(&cb->args[1], 0,
1779 sizeof(cb->args) - sizeof(cb->args[0]));
1780 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
1783 NLM_F_MULTI | NLM_F_APPEND,
1784 afi->family, table, chain, rule) < 0)
1787 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1801 static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
1802 const struct nlmsghdr *nlh,
1803 const struct nlattr * const nla[])
1805 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1806 const struct nft_af_info *afi;
1807 const struct nft_table *table;
1808 const struct nft_chain *chain;
1809 const struct nft_rule *rule;
1810 struct sk_buff *skb2;
1811 struct net *net = sock_net(skb->sk);
1812 int family = nfmsg->nfgen_family;
1815 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1816 struct netlink_dump_control c = {
1817 .dump = nf_tables_dump_rules,
1819 return netlink_dump_start(nlsk, skb, nlh, &c);
1822 afi = nf_tables_afinfo_lookup(net, family, false);
1824 return PTR_ERR(afi);
1826 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1828 return PTR_ERR(table);
1829 if (table->flags & NFT_TABLE_INACTIVE)
1832 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1834 return PTR_ERR(chain);
1835 if (chain->flags & NFT_CHAIN_INACTIVE)
1838 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1840 return PTR_ERR(rule);
1842 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1846 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
1847 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1848 family, table, chain, rule);
1852 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1859 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1860 struct nft_rule *rule)
1862 struct nft_expr *expr;
1865 * Careful: some expressions might not be initialized in case this
1866 * is called on error from nf_tables_newrule().
1868 expr = nft_expr_first(rule);
1869 while (expr->ops && expr != nft_expr_last(rule)) {
1870 nf_tables_expr_destroy(ctx, expr);
1871 expr = nft_expr_next(expr);
1876 #define NFT_RULE_MAXEXPRS 128
1878 static struct nft_expr_info *info;
1880 static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
1881 const struct nlmsghdr *nlh,
1882 const struct nlattr * const nla[])
1884 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1885 struct nft_af_info *afi;
1886 struct net *net = sock_net(skb->sk);
1887 struct nft_table *table;
1888 struct nft_chain *chain;
1889 struct nft_rule *rule, *old_rule = NULL;
1890 struct nft_trans *trans = NULL;
1891 struct nft_expr *expr;
1894 unsigned int size, i, n, ulen = 0;
1897 u64 handle, pos_handle;
1899 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1901 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
1903 return PTR_ERR(afi);
1905 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1907 return PTR_ERR(table);
1909 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1911 return PTR_ERR(chain);
1913 if (nla[NFTA_RULE_HANDLE]) {
1914 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
1915 rule = __nf_tables_rule_lookup(chain, handle);
1917 return PTR_ERR(rule);
1919 if (nlh->nlmsg_flags & NLM_F_EXCL)
1921 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1926 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
1928 handle = nf_tables_alloc_handle(table);
1930 if (chain->use == UINT_MAX)
1934 if (nla[NFTA_RULE_POSITION]) {
1935 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1938 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
1939 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
1940 if (IS_ERR(old_rule))
1941 return PTR_ERR(old_rule);
1944 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1948 if (nla[NFTA_RULE_EXPRESSIONS]) {
1949 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
1951 if (nla_type(tmp) != NFTA_LIST_ELEM)
1953 if (n == NFT_RULE_MAXEXPRS)
1955 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
1958 size += info[n].ops->size;
1963 if (nla[NFTA_RULE_USERDATA])
1964 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
1967 rule = kzalloc(sizeof(*rule) + size + ulen, GFP_KERNEL);
1971 nft_rule_activate_next(net, rule);
1973 rule->handle = handle;
1978 nla_memcpy(nft_userdata(rule), nla[NFTA_RULE_USERDATA], ulen);
1980 expr = nft_expr_first(rule);
1981 for (i = 0; i < n; i++) {
1982 err = nf_tables_newexpr(&ctx, &info[i], expr);
1986 expr = nft_expr_next(expr);
1989 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
1990 if (nft_rule_is_active_next(net, old_rule)) {
1991 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
1993 if (trans == NULL) {
1997 nft_rule_deactivate_next(net, old_rule);
1999 list_add_tail_rcu(&rule->list, &old_rule->list);
2004 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2006 list_add_rcu(&rule->list, &old_rule->list);
2008 list_add_tail_rcu(&rule->list, &chain->rules);
2011 list_add_tail_rcu(&rule->list, &old_rule->list);
2013 list_add_rcu(&rule->list, &chain->rules);
2016 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2024 list_del_rcu(&rule->list);
2026 list_del_rcu(&nft_trans_rule(trans)->list);
2027 nft_rule_clear(net, nft_trans_rule(trans));
2028 nft_trans_destroy(trans);
2032 nf_tables_rule_destroy(&ctx, rule);
2034 for (i = 0; i < n; i++) {
2035 if (info[i].ops != NULL)
2036 module_put(info[i].ops->type->owner);
2041 static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
2042 const struct nlmsghdr *nlh,
2043 const struct nlattr * const nla[])
2045 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2046 struct nft_af_info *afi;
2047 struct net *net = sock_net(skb->sk);
2048 struct nft_table *table;
2049 struct nft_chain *chain = NULL;
2050 struct nft_rule *rule;
2051 int family = nfmsg->nfgen_family, err = 0;
2054 afi = nf_tables_afinfo_lookup(net, family, false);
2056 return PTR_ERR(afi);
2058 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
2060 return PTR_ERR(table);
2061 if (table->flags & NFT_TABLE_INACTIVE)
2064 if (nla[NFTA_RULE_CHAIN]) {
2065 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2067 return PTR_ERR(chain);
2070 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
2073 if (nla[NFTA_RULE_HANDLE]) {
2074 rule = nf_tables_rule_lookup(chain,
2075 nla[NFTA_RULE_HANDLE]);
2077 return PTR_ERR(rule);
2079 err = nft_delrule(&ctx, rule);
2081 err = nft_delrule_by_chain(&ctx);
2084 list_for_each_entry(chain, &table->chains, list) {
2086 err = nft_delrule_by_chain(&ctx);
2099 static LIST_HEAD(nf_tables_set_ops);
2101 int nft_register_set(struct nft_set_ops *ops)
2103 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2104 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2105 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2108 EXPORT_SYMBOL_GPL(nft_register_set);
2110 void nft_unregister_set(struct nft_set_ops *ops)
2112 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2113 list_del_rcu(&ops->list);
2114 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2116 EXPORT_SYMBOL_GPL(nft_unregister_set);
2119 * Select a set implementation based on the data characteristics and the
2120 * given policy. The total memory use might not be known if no size is
2121 * given, in that case the amount of memory per element is used.
2123 static const struct nft_set_ops *
2124 nft_select_set_ops(const struct nlattr * const nla[],
2125 const struct nft_set_desc *desc,
2126 enum nft_set_policies policy)
2128 const struct nft_set_ops *ops, *bops;
2129 struct nft_set_estimate est, best;
2132 #ifdef CONFIG_MODULES
2133 if (list_empty(&nf_tables_set_ops)) {
2134 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2135 request_module("nft-set");
2136 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2137 if (!list_empty(&nf_tables_set_ops))
2138 return ERR_PTR(-EAGAIN);
2142 if (nla[NFTA_SET_FLAGS] != NULL) {
2143 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2144 features &= NFT_SET_INTERVAL | NFT_SET_MAP;
2151 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2152 if ((ops->features & features) != features)
2154 if (!ops->estimate(desc, features, &est))
2158 case NFT_SET_POL_PERFORMANCE:
2159 if (est.class < best.class)
2161 if (est.class == best.class && est.size < best.size)
2164 case NFT_SET_POL_MEMORY:
2165 if (est.size < best.size)
2167 if (est.size == best.size && est.class < best.class)
2174 if (!try_module_get(ops->owner))
2177 module_put(bops->owner);
2186 return ERR_PTR(-EOPNOTSUPP);
2189 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2190 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2191 [NFTA_SET_NAME] = { .type = NLA_STRING,
2192 .len = IFNAMSIZ - 1 },
2193 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2194 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2195 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2196 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2197 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2198 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2199 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2200 [NFTA_SET_ID] = { .type = NLA_U32 },
2203 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2204 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2207 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx,
2208 const struct sk_buff *skb,
2209 const struct nlmsghdr *nlh,
2210 const struct nlattr * const nla[])
2212 struct net *net = sock_net(skb->sk);
2213 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2214 struct nft_af_info *afi = NULL;
2215 struct nft_table *table = NULL;
2217 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2218 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2220 return PTR_ERR(afi);
2223 if (nla[NFTA_SET_TABLE] != NULL) {
2225 return -EAFNOSUPPORT;
2227 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2229 return PTR_ERR(table);
2230 if (table->flags & NFT_TABLE_INACTIVE)
2234 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2238 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2239 const struct nlattr *nla)
2241 struct nft_set *set;
2244 return ERR_PTR(-EINVAL);
2246 list_for_each_entry(set, &table->sets, list) {
2247 if (!nla_strcmp(nla, set->name))
2250 return ERR_PTR(-ENOENT);
2253 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2254 const struct nlattr *nla)
2256 struct nft_trans *trans;
2257 u32 id = ntohl(nla_get_be32(nla));
2259 list_for_each_entry(trans, &net->nft.commit_list, list) {
2260 if (trans->msg_type == NFT_MSG_NEWSET &&
2261 id == nft_trans_set_id(trans))
2262 return nft_trans_set(trans);
2264 return ERR_PTR(-ENOENT);
2267 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2270 const struct nft_set *i;
2272 unsigned long *inuse;
2273 unsigned int n = 0, min = 0;
2275 p = strnchr(name, IFNAMSIZ, '%');
2277 if (p[1] != 'd' || strchr(p + 2, '%'))
2280 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2284 list_for_each_entry(i, &ctx->table->sets, list) {
2287 if (!sscanf(i->name, name, &tmp))
2289 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2292 set_bit(tmp - min, inuse);
2295 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2296 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2297 min += BITS_PER_BYTE * PAGE_SIZE;
2298 memset(inuse, 0, PAGE_SIZE);
2301 free_page((unsigned long)inuse);
2304 snprintf(set->name, sizeof(set->name), name, min + n);
2305 list_for_each_entry(i, &ctx->table->sets, list) {
2306 if (!strcmp(set->name, i->name))
2312 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2313 const struct nft_set *set, u16 event, u16 flags)
2315 struct nfgenmsg *nfmsg;
2316 struct nlmsghdr *nlh;
2317 struct nlattr *desc;
2318 u32 portid = ctx->portid;
2321 event |= NFNL_SUBSYS_NFTABLES << 8;
2322 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2325 goto nla_put_failure;
2327 nfmsg = nlmsg_data(nlh);
2328 nfmsg->nfgen_family = ctx->afi->family;
2329 nfmsg->version = NFNETLINK_V0;
2330 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2332 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2333 goto nla_put_failure;
2334 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2335 goto nla_put_failure;
2336 if (set->flags != 0)
2337 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2338 goto nla_put_failure;
2340 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2341 goto nla_put_failure;
2342 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2343 goto nla_put_failure;
2344 if (set->flags & NFT_SET_MAP) {
2345 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2346 goto nla_put_failure;
2347 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2348 goto nla_put_failure;
2351 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2352 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2353 goto nla_put_failure;
2356 desc = nla_nest_start(skb, NFTA_SET_DESC);
2358 goto nla_put_failure;
2360 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2361 goto nla_put_failure;
2362 nla_nest_end(skb, desc);
2364 return nlmsg_end(skb, nlh);
2367 nlmsg_trim(skb, nlh);
2371 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2372 const struct nft_set *set,
2373 int event, gfp_t gfp_flags)
2375 struct sk_buff *skb;
2376 u32 portid = ctx->portid;
2380 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2384 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2388 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2394 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2395 ctx->report, gfp_flags);
2398 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2402 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2404 const struct nft_set *set;
2405 unsigned int idx, s_idx = cb->args[0];
2406 struct nft_af_info *afi;
2407 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2408 struct net *net = sock_net(skb->sk);
2409 int cur_family = cb->args[3];
2410 struct nft_ctx *ctx = cb->data, ctx_set;
2416 cb->seq = net->nft.base_seq;
2418 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2419 if (ctx->afi && ctx->afi != afi)
2423 if (afi->family != cur_family)
2428 list_for_each_entry_rcu(table, &afi->tables, list) {
2429 if (ctx->table && ctx->table != table)
2433 if (cur_table != table)
2439 list_for_each_entry_rcu(set, &table->sets, list) {
2444 ctx_set.table = table;
2446 if (nf_tables_fill_set(skb, &ctx_set, set,
2450 cb->args[2] = (unsigned long) table;
2451 cb->args[3] = afi->family;
2454 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2468 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2474 static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
2475 const struct nlmsghdr *nlh,
2476 const struct nlattr * const nla[])
2478 const struct nft_set *set;
2480 struct sk_buff *skb2;
2481 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2484 /* Verify existence before starting dump */
2485 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2489 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2490 struct netlink_dump_control c = {
2491 .dump = nf_tables_dump_sets,
2492 .done = nf_tables_dump_sets_done,
2494 struct nft_ctx *ctx_dump;
2496 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2497 if (ctx_dump == NULL)
2503 return netlink_dump_start(nlsk, skb, nlh, &c);
2506 /* Only accept unspec with dump */
2507 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2508 return -EAFNOSUPPORT;
2510 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2512 return PTR_ERR(set);
2513 if (set->flags & NFT_SET_INACTIVE)
2516 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2520 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2524 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2531 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2532 struct nft_set_desc *desc,
2533 const struct nlattr *nla)
2535 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2538 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2542 if (da[NFTA_SET_DESC_SIZE] != NULL)
2543 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2548 static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
2549 const struct nlmsghdr *nlh,
2550 const struct nlattr * const nla[])
2552 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2553 const struct nft_set_ops *ops;
2554 struct nft_af_info *afi;
2555 struct net *net = sock_net(skb->sk);
2556 struct nft_table *table;
2557 struct nft_set *set;
2559 char name[IFNAMSIZ];
2562 u32 ktype, dtype, flags, policy;
2563 struct nft_set_desc desc;
2566 if (nla[NFTA_SET_TABLE] == NULL ||
2567 nla[NFTA_SET_NAME] == NULL ||
2568 nla[NFTA_SET_KEY_LEN] == NULL ||
2569 nla[NFTA_SET_ID] == NULL)
2572 memset(&desc, 0, sizeof(desc));
2574 ktype = NFT_DATA_VALUE;
2575 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2576 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2577 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2581 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2582 if (desc.klen == 0 || desc.klen > FIELD_SIZEOF(struct nft_data, data))
2586 if (nla[NFTA_SET_FLAGS] != NULL) {
2587 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2588 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2589 NFT_SET_INTERVAL | NFT_SET_MAP))
2594 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2595 if (!(flags & NFT_SET_MAP))
2598 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2599 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2600 dtype != NFT_DATA_VERDICT)
2603 if (dtype != NFT_DATA_VERDICT) {
2604 if (nla[NFTA_SET_DATA_LEN] == NULL)
2606 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2607 if (desc.dlen == 0 ||
2608 desc.dlen > FIELD_SIZEOF(struct nft_data, data))
2611 desc.dlen = sizeof(struct nft_data);
2612 } else if (flags & NFT_SET_MAP)
2615 policy = NFT_SET_POL_PERFORMANCE;
2616 if (nla[NFTA_SET_POLICY] != NULL)
2617 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2619 if (nla[NFTA_SET_DESC] != NULL) {
2620 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2625 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2627 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2629 return PTR_ERR(afi);
2631 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2633 return PTR_ERR(table);
2635 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
2637 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2639 if (PTR_ERR(set) != -ENOENT)
2640 return PTR_ERR(set);
2645 if (nlh->nlmsg_flags & NLM_F_EXCL)
2647 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2652 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2655 ops = nft_select_set_ops(nla, &desc, policy);
2657 return PTR_ERR(ops);
2660 if (ops->privsize != NULL)
2661 size = ops->privsize(nla);
2664 set = kzalloc(sizeof(*set) + size, GFP_KERNEL);
2668 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2669 err = nf_tables_set_alloc_name(&ctx, set, name);
2673 INIT_LIST_HEAD(&set->bindings);
2676 set->klen = desc.klen;
2678 set->dlen = desc.dlen;
2680 set->size = desc.size;
2681 set->policy = policy;
2683 err = ops->init(set, &desc, nla);
2687 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2691 list_add_tail_rcu(&set->list, &table->sets);
2698 module_put(ops->owner);
2702 static void nft_set_destroy(struct nft_set *set)
2704 set->ops->destroy(set);
2705 module_put(set->ops->owner);
2709 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2711 list_del_rcu(&set->list);
2712 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
2713 nft_set_destroy(set);
2716 static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
2717 const struct nlmsghdr *nlh,
2718 const struct nlattr * const nla[])
2720 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2721 struct nft_set *set;
2725 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2726 return -EAFNOSUPPORT;
2727 if (nla[NFTA_SET_TABLE] == NULL)
2730 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2734 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2736 return PTR_ERR(set);
2737 if (set->flags & NFT_SET_INACTIVE)
2739 if (!list_empty(&set->bindings))
2742 return nft_delset(&ctx, set);
2745 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2746 const struct nft_set *set,
2747 const struct nft_set_iter *iter,
2748 const struct nft_set_elem *elem)
2750 enum nft_registers dreg;
2752 dreg = nft_type_to_reg(set->dtype);
2753 return nft_validate_data_load(ctx, dreg, &elem->data,
2754 set->dtype == NFT_DATA_VERDICT ?
2755 NFT_DATA_VERDICT : NFT_DATA_VALUE);
2758 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2759 struct nft_set_binding *binding)
2761 struct nft_set_binding *i;
2762 struct nft_set_iter iter;
2764 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2767 if (set->flags & NFT_SET_MAP) {
2768 /* If the set is already bound to the same chain all
2769 * jumps are already validated for that chain.
2771 list_for_each_entry(i, &set->bindings, list) {
2772 if (i->chain == binding->chain)
2779 iter.fn = nf_tables_bind_check_setelem;
2781 set->ops->walk(ctx, set, &iter);
2783 /* Destroy anonymous sets if binding fails */
2784 if (set->flags & NFT_SET_ANONYMOUS)
2785 nf_tables_set_destroy(ctx, set);
2791 binding->chain = ctx->chain;
2792 list_add_tail_rcu(&binding->list, &set->bindings);
2796 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2797 struct nft_set_binding *binding)
2799 list_del_rcu(&binding->list);
2801 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2802 !(set->flags & NFT_SET_INACTIVE))
2803 nf_tables_set_destroy(ctx, set);
2810 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
2811 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
2812 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
2813 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
2816 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
2817 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
2818 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
2819 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
2820 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
2823 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx,
2824 const struct sk_buff *skb,
2825 const struct nlmsghdr *nlh,
2826 const struct nlattr * const nla[],
2829 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2830 struct nft_af_info *afi;
2831 struct nft_table *table;
2832 struct net *net = sock_net(skb->sk);
2834 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2836 return PTR_ERR(afi);
2838 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
2840 return PTR_ERR(table);
2841 if (!trans && (table->flags & NFT_TABLE_INACTIVE))
2844 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2848 static int nf_tables_fill_setelem(struct sk_buff *skb,
2849 const struct nft_set *set,
2850 const struct nft_set_elem *elem)
2852 unsigned char *b = skb_tail_pointer(skb);
2853 struct nlattr *nest;
2855 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
2857 goto nla_put_failure;
2859 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE,
2861 goto nla_put_failure;
2863 if (set->flags & NFT_SET_MAP &&
2864 !(elem->flags & NFT_SET_ELEM_INTERVAL_END) &&
2865 nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data,
2866 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
2868 goto nla_put_failure;
2870 if (elem->flags != 0)
2871 if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags)))
2872 goto nla_put_failure;
2874 nla_nest_end(skb, nest);
2882 struct nft_set_dump_args {
2883 const struct netlink_callback *cb;
2884 struct nft_set_iter iter;
2885 struct sk_buff *skb;
2888 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
2889 const struct nft_set *set,
2890 const struct nft_set_iter *iter,
2891 const struct nft_set_elem *elem)
2893 struct nft_set_dump_args *args;
2895 args = container_of(iter, struct nft_set_dump_args, iter);
2896 return nf_tables_fill_setelem(args->skb, set, elem);
2899 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
2901 const struct nft_set *set;
2902 struct nft_set_dump_args args;
2904 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
2905 struct nfgenmsg *nfmsg;
2906 struct nlmsghdr *nlh;
2907 struct nlattr *nest;
2911 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
2912 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
2916 err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla,
2921 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2923 return PTR_ERR(set);
2924 if (set->flags & NFT_SET_INACTIVE)
2927 event = NFT_MSG_NEWSETELEM;
2928 event |= NFNL_SUBSYS_NFTABLES << 8;
2929 portid = NETLINK_CB(cb->skb).portid;
2930 seq = cb->nlh->nlmsg_seq;
2932 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2935 goto nla_put_failure;
2937 nfmsg = nlmsg_data(nlh);
2938 nfmsg->nfgen_family = ctx.afi->family;
2939 nfmsg->version = NFNETLINK_V0;
2940 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
2942 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
2943 goto nla_put_failure;
2944 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
2945 goto nla_put_failure;
2947 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2949 goto nla_put_failure;
2953 args.iter.skip = cb->args[0];
2954 args.iter.count = 0;
2956 args.iter.fn = nf_tables_dump_setelem;
2957 set->ops->walk(&ctx, set, &args.iter);
2959 nla_nest_end(skb, nest);
2960 nlmsg_end(skb, nlh);
2962 if (args.iter.err && args.iter.err != -EMSGSIZE)
2963 return args.iter.err;
2964 if (args.iter.count == cb->args[0])
2967 cb->args[0] = args.iter.count;
2974 static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb,
2975 const struct nlmsghdr *nlh,
2976 const struct nlattr * const nla[])
2978 const struct nft_set *set;
2982 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
2986 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2988 return PTR_ERR(set);
2989 if (set->flags & NFT_SET_INACTIVE)
2992 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2993 struct netlink_dump_control c = {
2994 .dump = nf_tables_dump_set,
2996 return netlink_dump_start(nlsk, skb, nlh, &c);
3001 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3002 const struct nft_ctx *ctx, u32 seq,
3003 u32 portid, int event, u16 flags,
3004 const struct nft_set *set,
3005 const struct nft_set_elem *elem)
3007 struct nfgenmsg *nfmsg;
3008 struct nlmsghdr *nlh;
3009 struct nlattr *nest;
3012 event |= NFNL_SUBSYS_NFTABLES << 8;
3013 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3016 goto nla_put_failure;
3018 nfmsg = nlmsg_data(nlh);
3019 nfmsg->nfgen_family = ctx->afi->family;
3020 nfmsg->version = NFNETLINK_V0;
3021 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3023 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3024 goto nla_put_failure;
3025 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3026 goto nla_put_failure;
3028 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3030 goto nla_put_failure;
3032 err = nf_tables_fill_setelem(skb, set, elem);
3034 goto nla_put_failure;
3036 nla_nest_end(skb, nest);
3038 return nlmsg_end(skb, nlh);
3041 nlmsg_trim(skb, nlh);
3045 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3046 const struct nft_set *set,
3047 const struct nft_set_elem *elem,
3048 int event, u16 flags)
3050 struct net *net = ctx->net;
3051 u32 portid = ctx->portid;
3052 struct sk_buff *skb;
3055 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3059 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3063 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3070 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3074 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3078 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3080 struct nft_set *set)
3082 struct nft_trans *trans;
3084 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3088 nft_trans_elem_set(trans) = set;
3092 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3093 const struct nlattr *attr)
3095 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3096 struct nft_data_desc d1, d2;
3097 struct nft_set_elem elem;
3098 struct nft_set_binding *binding;
3099 enum nft_registers dreg;
3100 struct nft_trans *trans;
3103 if (set->size && set->nelems == set->size)
3106 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3107 nft_set_elem_policy);
3111 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3115 if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
3116 elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
3117 if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END)
3121 if (set->flags & NFT_SET_MAP) {
3122 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3123 !(elem.flags & NFT_SET_ELEM_INTERVAL_END))
3125 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3126 elem.flags & NFT_SET_ELEM_INTERVAL_END)
3129 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3133 err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]);
3137 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3141 if (set->ops->get(set, &elem) == 0)
3144 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3145 err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]);
3150 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3153 dreg = nft_type_to_reg(set->dtype);
3154 list_for_each_entry(binding, &set->bindings, list) {
3155 struct nft_ctx bind_ctx = {
3157 .table = ctx->table,
3158 .chain = (struct nft_chain *)binding->chain,
3161 err = nft_validate_data_load(&bind_ctx, dreg,
3162 &elem.data, d2.type);
3168 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3172 err = set->ops->insert(set, &elem);
3176 nft_trans_elem(trans) = elem;
3177 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3183 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3184 nft_data_uninit(&elem.data, d2.type);
3186 nft_data_uninit(&elem.key, d1.type);
3191 static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb,
3192 const struct nlmsghdr *nlh,
3193 const struct nlattr * const nla[])
3195 struct net *net = sock_net(skb->sk);
3196 const struct nlattr *attr;
3197 struct nft_set *set;
3201 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3204 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, true);
3208 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3210 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3211 set = nf_tables_set_lookup_byid(net,
3212 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3215 return PTR_ERR(set);
3218 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3221 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3222 err = nft_add_set_elem(&ctx, set, attr);
3231 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3232 const struct nlattr *attr)
3234 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3235 struct nft_data_desc desc;
3236 struct nft_set_elem elem;
3237 struct nft_trans *trans;
3240 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3241 nft_set_elem_policy);
3246 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3249 err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]);
3254 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3257 err = set->ops->get(set, &elem);
3261 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3262 if (trans == NULL) {
3267 nft_trans_elem(trans) = elem;
3268 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3271 nft_data_uninit(&elem.key, desc.type);
3276 static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb,
3277 const struct nlmsghdr *nlh,
3278 const struct nlattr * const nla[])
3280 const struct nlattr *attr;
3281 struct nft_set *set;
3285 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3288 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
3292 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3294 return PTR_ERR(set);
3295 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3298 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3299 err = nft_del_setelem(&ctx, set, attr);
3308 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
3309 u32 portid, u32 seq)
3311 struct nlmsghdr *nlh;
3312 struct nfgenmsg *nfmsg;
3313 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
3315 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
3317 goto nla_put_failure;
3319 nfmsg = nlmsg_data(nlh);
3320 nfmsg->nfgen_family = AF_UNSPEC;
3321 nfmsg->version = NFNETLINK_V0;
3322 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3324 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
3325 goto nla_put_failure;
3327 return nlmsg_end(skb, nlh);
3330 nlmsg_trim(skb, nlh);
3334 static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
3336 struct nlmsghdr *nlh = nlmsg_hdr(skb);
3337 struct sk_buff *skb2;
3340 if (nlmsg_report(nlh) &&
3341 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3345 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3349 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3356 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
3357 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
3360 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
3366 static int nf_tables_getgen(struct sock *nlsk, struct sk_buff *skb,
3367 const struct nlmsghdr *nlh,
3368 const struct nlattr * const nla[])
3370 struct net *net = sock_net(skb->sk);
3371 struct sk_buff *skb2;
3374 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3378 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3383 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3389 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3390 [NFT_MSG_NEWTABLE] = {
3391 .call_batch = nf_tables_newtable,
3392 .attr_count = NFTA_TABLE_MAX,
3393 .policy = nft_table_policy,
3395 [NFT_MSG_GETTABLE] = {
3396 .call = nf_tables_gettable,
3397 .attr_count = NFTA_TABLE_MAX,
3398 .policy = nft_table_policy,
3400 [NFT_MSG_DELTABLE] = {
3401 .call_batch = nf_tables_deltable,
3402 .attr_count = NFTA_TABLE_MAX,
3403 .policy = nft_table_policy,
3405 [NFT_MSG_NEWCHAIN] = {
3406 .call_batch = nf_tables_newchain,
3407 .attr_count = NFTA_CHAIN_MAX,
3408 .policy = nft_chain_policy,
3410 [NFT_MSG_GETCHAIN] = {
3411 .call = nf_tables_getchain,
3412 .attr_count = NFTA_CHAIN_MAX,
3413 .policy = nft_chain_policy,
3415 [NFT_MSG_DELCHAIN] = {
3416 .call_batch = nf_tables_delchain,
3417 .attr_count = NFTA_CHAIN_MAX,
3418 .policy = nft_chain_policy,
3420 [NFT_MSG_NEWRULE] = {
3421 .call_batch = nf_tables_newrule,
3422 .attr_count = NFTA_RULE_MAX,
3423 .policy = nft_rule_policy,
3425 [NFT_MSG_GETRULE] = {
3426 .call = nf_tables_getrule,
3427 .attr_count = NFTA_RULE_MAX,
3428 .policy = nft_rule_policy,
3430 [NFT_MSG_DELRULE] = {
3431 .call_batch = nf_tables_delrule,
3432 .attr_count = NFTA_RULE_MAX,
3433 .policy = nft_rule_policy,
3435 [NFT_MSG_NEWSET] = {
3436 .call_batch = nf_tables_newset,
3437 .attr_count = NFTA_SET_MAX,
3438 .policy = nft_set_policy,
3440 [NFT_MSG_GETSET] = {
3441 .call = nf_tables_getset,
3442 .attr_count = NFTA_SET_MAX,
3443 .policy = nft_set_policy,
3445 [NFT_MSG_DELSET] = {
3446 .call_batch = nf_tables_delset,
3447 .attr_count = NFTA_SET_MAX,
3448 .policy = nft_set_policy,
3450 [NFT_MSG_NEWSETELEM] = {
3451 .call_batch = nf_tables_newsetelem,
3452 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3453 .policy = nft_set_elem_list_policy,
3455 [NFT_MSG_GETSETELEM] = {
3456 .call = nf_tables_getsetelem,
3457 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3458 .policy = nft_set_elem_list_policy,
3460 [NFT_MSG_DELSETELEM] = {
3461 .call_batch = nf_tables_delsetelem,
3462 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3463 .policy = nft_set_elem_list_policy,
3465 [NFT_MSG_GETGEN] = {
3466 .call = nf_tables_getgen,
3470 static void nft_chain_commit_update(struct nft_trans *trans)
3472 struct nft_base_chain *basechain;
3474 if (nft_trans_chain_name(trans)[0])
3475 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3477 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3480 basechain = nft_base_chain(trans->ctx.chain);
3481 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3483 switch (nft_trans_chain_policy(trans)) {
3486 basechain->policy = nft_trans_chain_policy(trans);
3491 static void nf_tables_commit_release(struct nft_trans *trans)
3493 switch (trans->msg_type) {
3494 case NFT_MSG_DELTABLE:
3495 nf_tables_table_destroy(&trans->ctx);
3497 case NFT_MSG_DELCHAIN:
3498 nf_tables_chain_destroy(trans->ctx.chain);
3500 case NFT_MSG_DELRULE:
3501 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3503 case NFT_MSG_DELSET:
3504 nft_set_destroy(nft_trans_set(trans));
3510 static int nf_tables_commit(struct sk_buff *skb)
3512 struct net *net = sock_net(skb->sk);
3513 struct nft_trans *trans, *next;
3514 struct nft_trans_elem *te;
3516 /* Bump generation counter, invalidate any dump in progress */
3517 while (++net->nft.base_seq == 0);
3519 /* A new generation has just started */
3520 net->nft.gencursor = gencursor_next(net);
3522 /* Make sure all packets have left the previous generation before
3523 * purging old rules.
3527 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3528 switch (trans->msg_type) {
3529 case NFT_MSG_NEWTABLE:
3530 if (nft_trans_table_update(trans)) {
3531 if (!nft_trans_table_enable(trans)) {
3532 nf_tables_table_disable(trans->ctx.afi,
3534 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3537 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3539 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
3540 nft_trans_destroy(trans);
3542 case NFT_MSG_DELTABLE:
3543 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
3545 case NFT_MSG_NEWCHAIN:
3546 if (nft_trans_chain_update(trans))
3547 nft_chain_commit_update(trans);
3549 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
3551 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
3552 nft_trans_destroy(trans);
3554 case NFT_MSG_DELCHAIN:
3555 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
3556 nf_tables_unregister_hooks(trans->ctx.table,
3558 trans->ctx.afi->nops);
3560 case NFT_MSG_NEWRULE:
3561 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3562 nf_tables_rule_notify(&trans->ctx,
3563 nft_trans_rule(trans),
3565 nft_trans_destroy(trans);
3567 case NFT_MSG_DELRULE:
3568 list_del_rcu(&nft_trans_rule(trans)->list);
3569 nf_tables_rule_notify(&trans->ctx,
3570 nft_trans_rule(trans),
3573 case NFT_MSG_NEWSET:
3574 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
3575 /* This avoids hitting -EBUSY when deleting the table
3576 * from the transaction.
3578 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
3579 !list_empty(&nft_trans_set(trans)->bindings))
3580 trans->ctx.table->use--;
3582 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3583 NFT_MSG_NEWSET, GFP_KERNEL);
3584 nft_trans_destroy(trans);
3586 case NFT_MSG_DELSET:
3587 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3588 NFT_MSG_DELSET, GFP_KERNEL);
3590 case NFT_MSG_NEWSETELEM:
3591 nf_tables_setelem_notify(&trans->ctx,
3592 nft_trans_elem_set(trans),
3593 &nft_trans_elem(trans),
3594 NFT_MSG_NEWSETELEM, 0);
3595 nft_trans_destroy(trans);
3597 case NFT_MSG_DELSETELEM:
3598 te = (struct nft_trans_elem *)trans->data;
3599 nf_tables_setelem_notify(&trans->ctx, te->set,
3601 NFT_MSG_DELSETELEM, 0);
3602 te->set->ops->get(te->set, &te->elem);
3603 te->set->ops->remove(te->set, &te->elem);
3604 nft_data_uninit(&te->elem.key, NFT_DATA_VALUE);
3605 if (te->elem.flags & NFT_SET_MAP) {
3606 nft_data_uninit(&te->elem.data,
3609 nft_trans_destroy(trans);
3616 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3617 list_del(&trans->list);
3618 nf_tables_commit_release(trans);
3621 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
3626 static void nf_tables_abort_release(struct nft_trans *trans)
3628 switch (trans->msg_type) {
3629 case NFT_MSG_NEWTABLE:
3630 nf_tables_table_destroy(&trans->ctx);
3632 case NFT_MSG_NEWCHAIN:
3633 nf_tables_chain_destroy(trans->ctx.chain);
3635 case NFT_MSG_NEWRULE:
3636 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3638 case NFT_MSG_NEWSET:
3639 nft_set_destroy(nft_trans_set(trans));
3645 static int nf_tables_abort(struct sk_buff *skb)
3647 struct net *net = sock_net(skb->sk);
3648 struct nft_trans *trans, *next;
3649 struct nft_set *set;
3651 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3652 switch (trans->msg_type) {
3653 case NFT_MSG_NEWTABLE:
3654 if (nft_trans_table_update(trans)) {
3655 if (nft_trans_table_enable(trans)) {
3656 nf_tables_table_disable(trans->ctx.afi,
3658 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3660 nft_trans_destroy(trans);
3662 list_del_rcu(&trans->ctx.table->list);
3665 case NFT_MSG_DELTABLE:
3666 list_add_tail_rcu(&trans->ctx.table->list,
3667 &trans->ctx.afi->tables);
3668 nft_trans_destroy(trans);
3670 case NFT_MSG_NEWCHAIN:
3671 if (nft_trans_chain_update(trans)) {
3672 free_percpu(nft_trans_chain_stats(trans));
3674 nft_trans_destroy(trans);
3676 trans->ctx.table->use--;
3677 list_del_rcu(&trans->ctx.chain->list);
3678 nf_tables_unregister_hooks(trans->ctx.table,
3680 trans->ctx.afi->nops);
3683 case NFT_MSG_DELCHAIN:
3684 trans->ctx.table->use++;
3685 list_add_tail_rcu(&trans->ctx.chain->list,
3686 &trans->ctx.table->chains);
3687 nft_trans_destroy(trans);
3689 case NFT_MSG_NEWRULE:
3690 trans->ctx.chain->use--;
3691 list_del_rcu(&nft_trans_rule(trans)->list);
3693 case NFT_MSG_DELRULE:
3694 trans->ctx.chain->use++;
3695 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3696 nft_trans_destroy(trans);
3698 case NFT_MSG_NEWSET:
3699 trans->ctx.table->use--;
3700 list_del_rcu(&nft_trans_set(trans)->list);
3702 case NFT_MSG_DELSET:
3703 trans->ctx.table->use++;
3704 list_add_tail_rcu(&nft_trans_set(trans)->list,
3705 &trans->ctx.table->sets);
3706 nft_trans_destroy(trans);
3708 case NFT_MSG_NEWSETELEM:
3709 nft_trans_elem_set(trans)->nelems--;
3710 set = nft_trans_elem_set(trans);
3711 set->ops->get(set, &nft_trans_elem(trans));
3712 set->ops->remove(set, &nft_trans_elem(trans));
3713 nft_trans_destroy(trans);
3715 case NFT_MSG_DELSETELEM:
3716 nft_trans_elem_set(trans)->nelems++;
3717 nft_trans_destroy(trans);
3724 list_for_each_entry_safe_reverse(trans, next,
3725 &net->nft.commit_list, list) {
3726 list_del(&trans->list);
3727 nf_tables_abort_release(trans);
3733 static const struct nfnetlink_subsystem nf_tables_subsys = {
3734 .name = "nf_tables",
3735 .subsys_id = NFNL_SUBSYS_NFTABLES,
3736 .cb_count = NFT_MSG_MAX,
3738 .commit = nf_tables_commit,
3739 .abort = nf_tables_abort,
3742 int nft_chain_validate_dependency(const struct nft_chain *chain,
3743 enum nft_chain_type type)
3745 const struct nft_base_chain *basechain;
3747 if (chain->flags & NFT_BASE_CHAIN) {
3748 basechain = nft_base_chain(chain);
3749 if (basechain->type->type != type)
3754 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
3757 * Loop detection - walk through the ruleset beginning at the destination chain
3758 * of a new jump until either the source chain is reached (loop) or all
3759 * reachable chains have been traversed.
3761 * The loop check is performed whenever a new jump verdict is added to an
3762 * expression or verdict map or a verdict map is bound to a new chain.
3765 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3766 const struct nft_chain *chain);
3768 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
3769 const struct nft_set *set,
3770 const struct nft_set_iter *iter,
3771 const struct nft_set_elem *elem)
3773 if (elem->flags & NFT_SET_ELEM_INTERVAL_END)
3776 switch (elem->data.verdict) {
3779 return nf_tables_check_loops(ctx, elem->data.chain);
3785 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3786 const struct nft_chain *chain)
3788 const struct nft_rule *rule;
3789 const struct nft_expr *expr, *last;
3790 const struct nft_set *set;
3791 struct nft_set_binding *binding;
3792 struct nft_set_iter iter;
3794 if (ctx->chain == chain)
3797 list_for_each_entry(rule, &chain->rules, list) {
3798 nft_rule_for_each_expr(expr, last, rule) {
3799 const struct nft_data *data = NULL;
3802 if (!expr->ops->validate)
3805 err = expr->ops->validate(ctx, expr, &data);
3812 switch (data->verdict) {
3815 err = nf_tables_check_loops(ctx, data->chain);
3824 list_for_each_entry(set, &ctx->table->sets, list) {
3825 if (!(set->flags & NFT_SET_MAP) ||
3826 set->dtype != NFT_DATA_VERDICT)
3829 list_for_each_entry(binding, &set->bindings, list) {
3830 if (binding->chain != chain)
3836 iter.fn = nf_tables_loop_check_setelem;
3838 set->ops->walk(ctx, set, &iter);
3848 * nft_validate_input_register - validate an expressions' input register
3850 * @reg: the register number
3852 * Validate that the input register is one of the general purpose
3855 int nft_validate_input_register(enum nft_registers reg)
3857 if (reg <= NFT_REG_VERDICT)
3859 if (reg > NFT_REG_MAX)
3863 EXPORT_SYMBOL_GPL(nft_validate_input_register);
3866 * nft_validate_output_register - validate an expressions' output register
3868 * @reg: the register number
3870 * Validate that the output register is one of the general purpose
3871 * registers or the verdict register.
3873 int nft_validate_output_register(enum nft_registers reg)
3875 if (reg < NFT_REG_VERDICT)
3877 if (reg > NFT_REG_MAX)
3881 EXPORT_SYMBOL_GPL(nft_validate_output_register);
3884 * nft_validate_data_load - validate an expressions' data load
3886 * @ctx: context of the expression performing the load
3887 * @reg: the destination register number
3888 * @data: the data to load
3889 * @type: the data type
3891 * Validate that a data load uses the appropriate data type for
3892 * the destination register. A value of NULL for the data means
3893 * that its runtime gathered data, which is always of type
3896 int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg,
3897 const struct nft_data *data,
3898 enum nft_data_types type)
3903 case NFT_REG_VERDICT:
3904 if (data == NULL || type != NFT_DATA_VERDICT)
3907 if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) {
3908 err = nf_tables_check_loops(ctx, data->chain);
3912 if (ctx->chain->level + 1 > data->chain->level) {
3913 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
3915 data->chain->level = ctx->chain->level + 1;
3921 if (data != NULL && type != NFT_DATA_VALUE)
3926 EXPORT_SYMBOL_GPL(nft_validate_data_load);
3928 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
3929 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
3930 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
3931 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3934 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
3935 struct nft_data_desc *desc, const struct nlattr *nla)
3937 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
3938 struct nft_chain *chain;
3941 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
3945 if (!tb[NFTA_VERDICT_CODE])
3947 data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
3949 switch (data->verdict) {
3951 switch (data->verdict & NF_VERDICT_MASK) {
3963 desc->len = sizeof(data->verdict);
3967 if (!tb[NFTA_VERDICT_CHAIN])
3969 chain = nf_tables_chain_lookup(ctx->table,
3970 tb[NFTA_VERDICT_CHAIN]);
3972 return PTR_ERR(chain);
3973 if (chain->flags & NFT_BASE_CHAIN)
3977 data->chain = chain;
3978 desc->len = sizeof(data);
3982 desc->type = NFT_DATA_VERDICT;
3986 static void nft_verdict_uninit(const struct nft_data *data)
3988 switch (data->verdict) {
3996 static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data)
3998 struct nlattr *nest;
4000 nest = nla_nest_start(skb, NFTA_DATA_VERDICT);
4002 goto nla_put_failure;
4004 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict)))
4005 goto nla_put_failure;
4007 switch (data->verdict) {
4010 if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name))
4011 goto nla_put_failure;
4013 nla_nest_end(skb, nest);
4020 static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data,
4021 struct nft_data_desc *desc, const struct nlattr *nla)
4028 if (len > sizeof(data->data))
4031 nla_memcpy(data->data, nla, sizeof(data->data));
4032 desc->type = NFT_DATA_VALUE;
4037 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
4040 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
4043 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
4044 [NFTA_DATA_VALUE] = { .type = NLA_BINARY,
4045 .len = FIELD_SIZEOF(struct nft_data, data) },
4046 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
4050 * nft_data_init - parse nf_tables data netlink attributes
4052 * @ctx: context of the expression using the data
4053 * @data: destination struct nft_data
4054 * @desc: data description
4055 * @nla: netlink attribute containing data
4057 * Parse the netlink data attributes and initialize a struct nft_data.
4058 * The type and length of data are returned in the data description.
4060 * The caller can indicate that it only wants to accept data of type
4061 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4063 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
4064 struct nft_data_desc *desc, const struct nlattr *nla)
4066 struct nlattr *tb[NFTA_DATA_MAX + 1];
4069 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
4073 if (tb[NFTA_DATA_VALUE])
4074 return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
4075 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
4076 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
4079 EXPORT_SYMBOL_GPL(nft_data_init);
4082 * nft_data_uninit - release a nft_data item
4084 * @data: struct nft_data to release
4085 * @type: type of data
4087 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4088 * all others need to be released by calling this function.
4090 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
4093 case NFT_DATA_VALUE:
4095 case NFT_DATA_VERDICT:
4096 return nft_verdict_uninit(data);
4101 EXPORT_SYMBOL_GPL(nft_data_uninit);
4103 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4104 enum nft_data_types type, unsigned int len)
4106 struct nlattr *nest;
4109 nest = nla_nest_start(skb, attr);
4114 case NFT_DATA_VALUE:
4115 err = nft_value_dump(skb, data, len);
4117 case NFT_DATA_VERDICT:
4118 err = nft_verdict_dump(skb, data);
4125 nla_nest_end(skb, nest);
4128 EXPORT_SYMBOL_GPL(nft_data_dump);
4130 static int nf_tables_init_net(struct net *net)
4132 INIT_LIST_HEAD(&net->nft.af_info);
4133 INIT_LIST_HEAD(&net->nft.commit_list);
4134 net->nft.base_seq = 1;
4138 static struct pernet_operations nf_tables_net_ops = {
4139 .init = nf_tables_init_net,
4142 static int __init nf_tables_module_init(void)
4146 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4153 err = nf_tables_core_module_init();
4157 err = nfnetlink_subsys_register(&nf_tables_subsys);
4161 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4162 return register_pernet_subsys(&nf_tables_net_ops);
4164 nf_tables_core_module_exit();
4171 static void __exit nf_tables_module_exit(void)
4173 unregister_pernet_subsys(&nf_tables_net_ops);
4174 nfnetlink_subsys_unregister(&nf_tables_subsys);
4176 nf_tables_core_module_exit();
4180 module_init(nf_tables_module_init);
4181 module_exit(nf_tables_module_exit);
4183 MODULE_LICENSE("GPL");
4184 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4185 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);