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_safe(chain, nc, &ctx->table->chains, list) {
719 err = nft_delrule_by_chain(ctx);
723 err = nft_delchain(ctx);
728 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
729 if (set->flags & NFT_SET_ANONYMOUS &&
730 !list_empty(&set->bindings))
733 err = nft_delset(ctx, set);
738 err = nft_deltable(ctx);
743 static int nft_flush(struct nft_ctx *ctx, int family)
745 struct nft_af_info *afi;
746 struct nft_table *table, *nt;
747 const struct nlattr * const *nla = ctx->nla;
750 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
751 if (family != AF_UNSPEC && afi->family != family)
755 list_for_each_entry_safe(table, nt, &afi->tables, list) {
756 if (nla[NFTA_TABLE_NAME] &&
757 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
762 err = nft_flush_table(ctx);
771 static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb,
772 const struct nlmsghdr *nlh,
773 const struct nlattr * const nla[])
775 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
776 struct nft_af_info *afi;
777 struct nft_table *table;
778 struct net *net = sock_net(skb->sk);
779 int family = nfmsg->nfgen_family;
782 nft_ctx_init(&ctx, skb, nlh, NULL, NULL, NULL, nla);
783 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
784 return nft_flush(&ctx, family);
786 afi = nf_tables_afinfo_lookup(net, family, false);
790 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
792 return PTR_ERR(table);
793 if (table->flags & NFT_TABLE_INACTIVE)
799 return nft_flush_table(&ctx);
802 static void nf_tables_table_destroy(struct nft_ctx *ctx)
804 BUG_ON(ctx->table->use > 0);
807 module_put(ctx->afi->owner);
810 int nft_register_chain_type(const struct nf_chain_type *ctype)
814 nfnl_lock(NFNL_SUBSYS_NFTABLES);
815 if (chain_type[ctype->family][ctype->type] != NULL) {
819 chain_type[ctype->family][ctype->type] = ctype;
821 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
824 EXPORT_SYMBOL_GPL(nft_register_chain_type);
826 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
828 nfnl_lock(NFNL_SUBSYS_NFTABLES);
829 chain_type[ctype->family][ctype->type] = NULL;
830 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
832 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
838 static struct nft_chain *
839 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
841 struct nft_chain *chain;
843 list_for_each_entry(chain, &table->chains, list) {
844 if (chain->handle == handle)
848 return ERR_PTR(-ENOENT);
851 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
852 const struct nlattr *nla)
854 struct nft_chain *chain;
857 return ERR_PTR(-EINVAL);
859 list_for_each_entry(chain, &table->chains, list) {
860 if (!nla_strcmp(nla, chain->name))
864 return ERR_PTR(-ENOENT);
867 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
868 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
869 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
870 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
871 .len = NFT_CHAIN_MAXNAMELEN - 1 },
872 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
873 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
874 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
875 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
878 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
879 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
880 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
883 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
885 struct nft_stats *cpu_stats, total;
891 memset(&total, 0, sizeof(total));
892 for_each_possible_cpu(cpu) {
893 cpu_stats = per_cpu_ptr(stats, cpu);
895 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
896 pkts = cpu_stats->pkts;
897 bytes = cpu_stats->bytes;
898 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
900 total.bytes += bytes;
902 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
904 goto nla_put_failure;
906 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) ||
907 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes)))
908 goto nla_put_failure;
910 nla_nest_end(skb, nest);
917 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
918 u32 portid, u32 seq, int event, u32 flags,
919 int family, const struct nft_table *table,
920 const struct nft_chain *chain)
922 struct nlmsghdr *nlh;
923 struct nfgenmsg *nfmsg;
925 event |= NFNL_SUBSYS_NFTABLES << 8;
926 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
928 goto nla_put_failure;
930 nfmsg = nlmsg_data(nlh);
931 nfmsg->nfgen_family = family;
932 nfmsg->version = NFNETLINK_V0;
933 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
935 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
936 goto nla_put_failure;
937 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle)))
938 goto nla_put_failure;
939 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
940 goto nla_put_failure;
942 if (chain->flags & NFT_BASE_CHAIN) {
943 const struct nft_base_chain *basechain = nft_base_chain(chain);
944 const struct nf_hook_ops *ops = &basechain->ops[0];
947 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
949 goto nla_put_failure;
950 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
951 goto nla_put_failure;
952 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
953 goto nla_put_failure;
954 nla_nest_end(skb, nest);
956 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
957 htonl(basechain->policy)))
958 goto nla_put_failure;
960 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
961 goto nla_put_failure;
963 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
964 goto nla_put_failure;
967 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
968 goto nla_put_failure;
970 return nlmsg_end(skb, nlh);
973 nlmsg_trim(skb, nlh);
977 static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
983 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
987 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
991 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
992 event, 0, ctx->afi->family, ctx->table,
999 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1000 ctx->report, GFP_KERNEL);
1003 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1009 static int nf_tables_dump_chains(struct sk_buff *skb,
1010 struct netlink_callback *cb)
1012 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1013 const struct nft_af_info *afi;
1014 const struct nft_table *table;
1015 const struct nft_chain *chain;
1016 unsigned int idx = 0, s_idx = cb->args[0];
1017 struct net *net = sock_net(skb->sk);
1018 int family = nfmsg->nfgen_family;
1021 cb->seq = net->nft.base_seq;
1023 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1024 if (family != NFPROTO_UNSPEC && family != afi->family)
1027 list_for_each_entry_rcu(table, &afi->tables, list) {
1028 list_for_each_entry_rcu(chain, &table->chains, list) {
1032 memset(&cb->args[1], 0,
1033 sizeof(cb->args) - sizeof(cb->args[0]));
1034 if (nf_tables_fill_chain_info(skb, net,
1035 NETLINK_CB(cb->skb).portid,
1039 afi->family, table, chain) < 0)
1042 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1054 static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb,
1055 const struct nlmsghdr *nlh,
1056 const struct nlattr * const nla[])
1058 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1059 const struct nft_af_info *afi;
1060 const struct nft_table *table;
1061 const struct nft_chain *chain;
1062 struct sk_buff *skb2;
1063 struct net *net = sock_net(skb->sk);
1064 int family = nfmsg->nfgen_family;
1067 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1068 struct netlink_dump_control c = {
1069 .dump = nf_tables_dump_chains,
1071 return netlink_dump_start(nlsk, skb, nlh, &c);
1074 afi = nf_tables_afinfo_lookup(net, family, false);
1076 return PTR_ERR(afi);
1078 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1080 return PTR_ERR(table);
1081 if (table->flags & NFT_TABLE_INACTIVE)
1084 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1086 return PTR_ERR(chain);
1087 if (chain->flags & NFT_CHAIN_INACTIVE)
1090 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1094 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1095 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1096 family, table, chain);
1100 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1107 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1108 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1109 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1112 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1114 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1115 struct nft_stats __percpu *newstats;
1116 struct nft_stats *stats;
1119 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1121 return ERR_PTR(err);
1123 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1124 return ERR_PTR(-EINVAL);
1126 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1127 if (newstats == NULL)
1128 return ERR_PTR(-ENOMEM);
1130 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1131 * are not exposed to userspace.
1133 stats = this_cpu_ptr(newstats);
1134 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1135 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1140 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1141 struct nft_stats __percpu *newstats)
1143 if (newstats == NULL)
1147 struct nft_stats __percpu *oldstats =
1148 nft_dereference(chain->stats);
1150 rcu_assign_pointer(chain->stats, newstats);
1152 free_percpu(oldstats);
1154 rcu_assign_pointer(chain->stats, newstats);
1157 static void nf_tables_chain_destroy(struct nft_chain *chain)
1159 BUG_ON(chain->use > 0);
1161 if (chain->flags & NFT_BASE_CHAIN) {
1162 module_put(nft_base_chain(chain)->type->owner);
1163 free_percpu(nft_base_chain(chain)->stats);
1164 kfree(nft_base_chain(chain));
1170 static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
1171 const struct nlmsghdr *nlh,
1172 const struct nlattr * const nla[])
1174 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1175 const struct nlattr * uninitialized_var(name);
1176 struct nft_af_info *afi;
1177 struct nft_table *table;
1178 struct nft_chain *chain;
1179 struct nft_base_chain *basechain = NULL;
1180 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1181 struct net *net = sock_net(skb->sk);
1182 int family = nfmsg->nfgen_family;
1183 u8 policy = NF_ACCEPT;
1186 struct nft_stats __percpu *stats;
1191 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1193 afi = nf_tables_afinfo_lookup(net, family, true);
1195 return PTR_ERR(afi);
1197 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1199 return PTR_ERR(table);
1202 name = nla[NFTA_CHAIN_NAME];
1204 if (nla[NFTA_CHAIN_HANDLE]) {
1205 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1206 chain = nf_tables_chain_lookup_byhandle(table, handle);
1208 return PTR_ERR(chain);
1210 chain = nf_tables_chain_lookup(table, name);
1211 if (IS_ERR(chain)) {
1212 if (PTR_ERR(chain) != -ENOENT)
1213 return PTR_ERR(chain);
1218 if (nla[NFTA_CHAIN_POLICY]) {
1219 if ((chain != NULL &&
1220 !(chain->flags & NFT_BASE_CHAIN)) ||
1221 nla[NFTA_CHAIN_HOOK] == NULL)
1224 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1234 if (chain != NULL) {
1235 struct nft_stats *stats = NULL;
1236 struct nft_trans *trans;
1238 if (chain->flags & NFT_CHAIN_INACTIVE)
1240 if (nlh->nlmsg_flags & NLM_F_EXCL)
1242 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1245 if (nla[NFTA_CHAIN_HANDLE] && name &&
1246 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
1249 if (nla[NFTA_CHAIN_COUNTERS]) {
1250 if (!(chain->flags & NFT_BASE_CHAIN))
1253 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1255 return PTR_ERR(stats);
1258 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1259 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1260 sizeof(struct nft_trans_chain));
1264 nft_trans_chain_stats(trans) = stats;
1265 nft_trans_chain_update(trans) = true;
1267 if (nla[NFTA_CHAIN_POLICY])
1268 nft_trans_chain_policy(trans) = policy;
1270 nft_trans_chain_policy(trans) = -1;
1272 if (nla[NFTA_CHAIN_HANDLE] && name) {
1273 nla_strlcpy(nft_trans_chain_name(trans), name,
1274 NFT_CHAIN_MAXNAMELEN);
1276 list_add_tail(&trans->list, &net->nft.commit_list);
1280 if (table->use == UINT_MAX)
1283 if (nla[NFTA_CHAIN_HOOK]) {
1284 const struct nf_chain_type *type;
1285 struct nf_hook_ops *ops;
1287 u32 hooknum, priority;
1289 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1290 if (nla[NFTA_CHAIN_TYPE]) {
1291 type = nf_tables_chain_type_lookup(afi,
1292 nla[NFTA_CHAIN_TYPE],
1295 return PTR_ERR(type);
1298 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1302 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1303 ha[NFTA_HOOK_PRIORITY] == NULL)
1306 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1307 if (hooknum >= afi->nhooks)
1309 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1311 if (!(type->hook_mask & (1 << hooknum)))
1313 if (!try_module_get(type->owner))
1315 hookfn = type->hooks[hooknum];
1317 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1318 if (basechain == NULL)
1321 if (nla[NFTA_CHAIN_COUNTERS]) {
1322 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1323 if (IS_ERR(stats)) {
1324 module_put(type->owner);
1326 return PTR_ERR(stats);
1328 basechain->stats = stats;
1330 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1331 if (IS_ERR(stats)) {
1332 module_put(type->owner);
1334 return PTR_ERR(stats);
1336 rcu_assign_pointer(basechain->stats, stats);
1339 basechain->type = type;
1340 chain = &basechain->chain;
1342 for (i = 0; i < afi->nops; i++) {
1343 ops = &basechain->ops[i];
1345 ops->owner = afi->owner;
1346 ops->hooknum = hooknum;
1347 ops->priority = priority;
1349 ops->hook = afi->hooks[ops->hooknum];
1352 if (afi->hook_ops_init)
1353 afi->hook_ops_init(ops, i);
1356 chain->flags |= NFT_BASE_CHAIN;
1357 basechain->policy = policy;
1359 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1364 INIT_LIST_HEAD(&chain->rules);
1365 chain->handle = nf_tables_alloc_handle(table);
1367 chain->table = table;
1368 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1370 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1371 chain->flags & NFT_BASE_CHAIN) {
1372 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
1377 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1378 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1383 list_add_tail_rcu(&chain->list, &table->chains);
1386 nf_tables_unregister_hooks(table, chain, afi->nops);
1388 nf_tables_chain_destroy(chain);
1392 static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
1393 const struct nlmsghdr *nlh,
1394 const struct nlattr * const nla[])
1396 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1397 struct nft_af_info *afi;
1398 struct nft_table *table;
1399 struct nft_chain *chain;
1400 struct net *net = sock_net(skb->sk);
1401 int family = nfmsg->nfgen_family;
1404 afi = nf_tables_afinfo_lookup(net, family, false);
1406 return PTR_ERR(afi);
1408 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1410 return PTR_ERR(table);
1411 if (table->flags & NFT_TABLE_INACTIVE)
1414 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1416 return PTR_ERR(chain);
1417 if (chain->flags & NFT_CHAIN_INACTIVE)
1422 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1424 return nft_delchain(&ctx);
1432 * nft_register_expr - register nf_tables expr type
1435 * Registers the expr type for use with nf_tables. Returns zero on
1436 * success or a negative errno code otherwise.
1438 int nft_register_expr(struct nft_expr_type *type)
1440 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1441 if (type->family == NFPROTO_UNSPEC)
1442 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1444 list_add_rcu(&type->list, &nf_tables_expressions);
1445 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1448 EXPORT_SYMBOL_GPL(nft_register_expr);
1451 * nft_unregister_expr - unregister nf_tables expr type
1454 * Unregisters the expr typefor use with nf_tables.
1456 void nft_unregister_expr(struct nft_expr_type *type)
1458 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1459 list_del_rcu(&type->list);
1460 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1462 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1464 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1467 const struct nft_expr_type *type;
1469 list_for_each_entry(type, &nf_tables_expressions, list) {
1470 if (!nla_strcmp(nla, type->name) &&
1471 (!type->family || type->family == family))
1477 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1480 const struct nft_expr_type *type;
1483 return ERR_PTR(-EINVAL);
1485 type = __nft_expr_type_get(family, nla);
1486 if (type != NULL && try_module_get(type->owner))
1489 #ifdef CONFIG_MODULES
1491 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1492 request_module("nft-expr-%u-%.*s", family,
1493 nla_len(nla), (char *)nla_data(nla));
1494 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1495 if (__nft_expr_type_get(family, nla))
1496 return ERR_PTR(-EAGAIN);
1498 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1499 request_module("nft-expr-%.*s",
1500 nla_len(nla), (char *)nla_data(nla));
1501 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1502 if (__nft_expr_type_get(family, nla))
1503 return ERR_PTR(-EAGAIN);
1506 return ERR_PTR(-ENOENT);
1509 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1510 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1511 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1514 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1515 const struct nft_expr *expr)
1517 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1518 goto nla_put_failure;
1520 if (expr->ops->dump) {
1521 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1523 goto nla_put_failure;
1524 if (expr->ops->dump(skb, expr) < 0)
1525 goto nla_put_failure;
1526 nla_nest_end(skb, data);
1535 struct nft_expr_info {
1536 const struct nft_expr_ops *ops;
1537 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1540 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1541 const struct nlattr *nla,
1542 struct nft_expr_info *info)
1544 const struct nft_expr_type *type;
1545 const struct nft_expr_ops *ops;
1546 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1549 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1553 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1555 return PTR_ERR(type);
1557 if (tb[NFTA_EXPR_DATA]) {
1558 err = nla_parse_nested(info->tb, type->maxattr,
1559 tb[NFTA_EXPR_DATA], type->policy);
1563 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1565 if (type->select_ops != NULL) {
1566 ops = type->select_ops(ctx,
1567 (const struct nlattr * const *)info->tb);
1579 module_put(type->owner);
1583 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1584 const struct nft_expr_info *info,
1585 struct nft_expr *expr)
1587 const struct nft_expr_ops *ops = info->ops;
1592 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1604 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1605 struct nft_expr *expr)
1607 if (expr->ops->destroy)
1608 expr->ops->destroy(ctx, expr);
1609 module_put(expr->ops->type->owner);
1616 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1619 struct nft_rule *rule;
1621 // FIXME: this sucks
1622 list_for_each_entry(rule, &chain->rules, list) {
1623 if (handle == rule->handle)
1627 return ERR_PTR(-ENOENT);
1630 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1631 const struct nlattr *nla)
1634 return ERR_PTR(-EINVAL);
1636 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1639 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1640 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1641 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1642 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1643 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1644 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1645 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1646 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1647 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1648 .len = NFT_USERDATA_MAXLEN },
1651 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1652 u32 portid, u32 seq, int event,
1653 u32 flags, int family,
1654 const struct nft_table *table,
1655 const struct nft_chain *chain,
1656 const struct nft_rule *rule)
1658 struct nlmsghdr *nlh;
1659 struct nfgenmsg *nfmsg;
1660 const struct nft_expr *expr, *next;
1661 struct nlattr *list;
1662 const struct nft_rule *prule;
1663 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1665 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1668 goto nla_put_failure;
1670 nfmsg = nlmsg_data(nlh);
1671 nfmsg->nfgen_family = family;
1672 nfmsg->version = NFNETLINK_V0;
1673 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1675 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1676 goto nla_put_failure;
1677 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1678 goto nla_put_failure;
1679 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle)))
1680 goto nla_put_failure;
1682 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1683 prule = list_entry(rule->list.prev, struct nft_rule, list);
1684 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1685 cpu_to_be64(prule->handle)))
1686 goto nla_put_failure;
1689 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1691 goto nla_put_failure;
1692 nft_rule_for_each_expr(expr, next, rule) {
1693 struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM);
1695 goto nla_put_failure;
1696 if (nf_tables_fill_expr_info(skb, expr) < 0)
1697 goto nla_put_failure;
1698 nla_nest_end(skb, elem);
1700 nla_nest_end(skb, list);
1703 nla_put(skb, NFTA_RULE_USERDATA, rule->ulen, nft_userdata(rule)))
1704 goto nla_put_failure;
1706 return nlmsg_end(skb, nlh);
1709 nlmsg_trim(skb, nlh);
1713 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1714 const struct nft_rule *rule,
1717 struct sk_buff *skb;
1721 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1725 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1729 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1730 event, 0, ctx->afi->family, ctx->table,
1737 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1738 ctx->report, GFP_KERNEL);
1741 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1747 static int nf_tables_dump_rules(struct sk_buff *skb,
1748 struct netlink_callback *cb)
1750 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1751 const struct nft_af_info *afi;
1752 const struct nft_table *table;
1753 const struct nft_chain *chain;
1754 const struct nft_rule *rule;
1755 unsigned int idx = 0, s_idx = cb->args[0];
1756 struct net *net = sock_net(skb->sk);
1757 int family = nfmsg->nfgen_family;
1760 cb->seq = net->nft.base_seq;
1762 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1763 if (family != NFPROTO_UNSPEC && family != afi->family)
1766 list_for_each_entry_rcu(table, &afi->tables, list) {
1767 list_for_each_entry_rcu(chain, &table->chains, list) {
1768 list_for_each_entry_rcu(rule, &chain->rules, list) {
1769 if (!nft_rule_is_active(net, rule))
1774 memset(&cb->args[1], 0,
1775 sizeof(cb->args) - sizeof(cb->args[0]));
1776 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
1779 NLM_F_MULTI | NLM_F_APPEND,
1780 afi->family, table, chain, rule) < 0)
1783 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1797 static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
1798 const struct nlmsghdr *nlh,
1799 const struct nlattr * const nla[])
1801 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1802 const struct nft_af_info *afi;
1803 const struct nft_table *table;
1804 const struct nft_chain *chain;
1805 const struct nft_rule *rule;
1806 struct sk_buff *skb2;
1807 struct net *net = sock_net(skb->sk);
1808 int family = nfmsg->nfgen_family;
1811 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1812 struct netlink_dump_control c = {
1813 .dump = nf_tables_dump_rules,
1815 return netlink_dump_start(nlsk, skb, nlh, &c);
1818 afi = nf_tables_afinfo_lookup(net, family, false);
1820 return PTR_ERR(afi);
1822 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1824 return PTR_ERR(table);
1825 if (table->flags & NFT_TABLE_INACTIVE)
1828 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1830 return PTR_ERR(chain);
1831 if (chain->flags & NFT_CHAIN_INACTIVE)
1834 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1836 return PTR_ERR(rule);
1838 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1842 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
1843 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1844 family, table, chain, rule);
1848 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1855 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1856 struct nft_rule *rule)
1858 struct nft_expr *expr;
1861 * Careful: some expressions might not be initialized in case this
1862 * is called on error from nf_tables_newrule().
1864 expr = nft_expr_first(rule);
1865 while (expr->ops && expr != nft_expr_last(rule)) {
1866 nf_tables_expr_destroy(ctx, expr);
1867 expr = nft_expr_next(expr);
1872 #define NFT_RULE_MAXEXPRS 128
1874 static struct nft_expr_info *info;
1876 static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
1877 const struct nlmsghdr *nlh,
1878 const struct nlattr * const nla[])
1880 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1881 struct nft_af_info *afi;
1882 struct net *net = sock_net(skb->sk);
1883 struct nft_table *table;
1884 struct nft_chain *chain;
1885 struct nft_rule *rule, *old_rule = NULL;
1886 struct nft_trans *trans = NULL;
1887 struct nft_expr *expr;
1890 unsigned int size, i, n, ulen = 0;
1893 u64 handle, pos_handle;
1895 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1897 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
1899 return PTR_ERR(afi);
1901 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1903 return PTR_ERR(table);
1905 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1907 return PTR_ERR(chain);
1909 if (nla[NFTA_RULE_HANDLE]) {
1910 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
1911 rule = __nf_tables_rule_lookup(chain, handle);
1913 return PTR_ERR(rule);
1915 if (nlh->nlmsg_flags & NLM_F_EXCL)
1917 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1922 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
1924 handle = nf_tables_alloc_handle(table);
1926 if (chain->use == UINT_MAX)
1930 if (nla[NFTA_RULE_POSITION]) {
1931 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1934 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
1935 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
1936 if (IS_ERR(old_rule))
1937 return PTR_ERR(old_rule);
1940 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1944 if (nla[NFTA_RULE_EXPRESSIONS]) {
1945 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
1947 if (nla_type(tmp) != NFTA_LIST_ELEM)
1949 if (n == NFT_RULE_MAXEXPRS)
1951 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
1954 size += info[n].ops->size;
1959 if (nla[NFTA_RULE_USERDATA])
1960 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
1963 rule = kzalloc(sizeof(*rule) + size + ulen, GFP_KERNEL);
1967 nft_rule_activate_next(net, rule);
1969 rule->handle = handle;
1974 nla_memcpy(nft_userdata(rule), nla[NFTA_RULE_USERDATA], ulen);
1976 expr = nft_expr_first(rule);
1977 for (i = 0; i < n; i++) {
1978 err = nf_tables_newexpr(&ctx, &info[i], expr);
1982 expr = nft_expr_next(expr);
1985 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
1986 if (nft_rule_is_active_next(net, old_rule)) {
1987 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
1989 if (trans == NULL) {
1993 nft_rule_deactivate_next(net, old_rule);
1995 list_add_tail_rcu(&rule->list, &old_rule->list);
2000 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2002 list_add_rcu(&rule->list, &old_rule->list);
2004 list_add_tail_rcu(&rule->list, &chain->rules);
2007 list_add_tail_rcu(&rule->list, &old_rule->list);
2009 list_add_rcu(&rule->list, &chain->rules);
2012 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2020 list_del_rcu(&rule->list);
2022 list_del_rcu(&nft_trans_rule(trans)->list);
2023 nft_rule_clear(net, nft_trans_rule(trans));
2024 nft_trans_destroy(trans);
2028 nf_tables_rule_destroy(&ctx, rule);
2030 for (i = 0; i < n; i++) {
2031 if (info[i].ops != NULL)
2032 module_put(info[i].ops->type->owner);
2037 static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
2038 const struct nlmsghdr *nlh,
2039 const struct nlattr * const nla[])
2041 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2042 struct nft_af_info *afi;
2043 struct net *net = sock_net(skb->sk);
2044 struct nft_table *table;
2045 struct nft_chain *chain = NULL;
2046 struct nft_rule *rule;
2047 int family = nfmsg->nfgen_family, err = 0;
2050 afi = nf_tables_afinfo_lookup(net, family, false);
2052 return PTR_ERR(afi);
2054 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
2056 return PTR_ERR(table);
2057 if (table->flags & NFT_TABLE_INACTIVE)
2060 if (nla[NFTA_RULE_CHAIN]) {
2061 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2063 return PTR_ERR(chain);
2066 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
2069 if (nla[NFTA_RULE_HANDLE]) {
2070 rule = nf_tables_rule_lookup(chain,
2071 nla[NFTA_RULE_HANDLE]);
2073 return PTR_ERR(rule);
2075 err = nft_delrule(&ctx, rule);
2077 err = nft_delrule_by_chain(&ctx);
2080 list_for_each_entry(chain, &table->chains, list) {
2082 err = nft_delrule_by_chain(&ctx);
2095 static LIST_HEAD(nf_tables_set_ops);
2097 int nft_register_set(struct nft_set_ops *ops)
2099 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2100 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2101 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2104 EXPORT_SYMBOL_GPL(nft_register_set);
2106 void nft_unregister_set(struct nft_set_ops *ops)
2108 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2109 list_del_rcu(&ops->list);
2110 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2112 EXPORT_SYMBOL_GPL(nft_unregister_set);
2115 * Select a set implementation based on the data characteristics and the
2116 * given policy. The total memory use might not be known if no size is
2117 * given, in that case the amount of memory per element is used.
2119 static const struct nft_set_ops *
2120 nft_select_set_ops(const struct nlattr * const nla[],
2121 const struct nft_set_desc *desc,
2122 enum nft_set_policies policy)
2124 const struct nft_set_ops *ops, *bops;
2125 struct nft_set_estimate est, best;
2128 #ifdef CONFIG_MODULES
2129 if (list_empty(&nf_tables_set_ops)) {
2130 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2131 request_module("nft-set");
2132 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2133 if (!list_empty(&nf_tables_set_ops))
2134 return ERR_PTR(-EAGAIN);
2138 if (nla[NFTA_SET_FLAGS] != NULL) {
2139 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2140 features &= NFT_SET_INTERVAL | NFT_SET_MAP;
2147 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2148 if ((ops->features & features) != features)
2150 if (!ops->estimate(desc, features, &est))
2154 case NFT_SET_POL_PERFORMANCE:
2155 if (est.class < best.class)
2157 if (est.class == best.class && est.size < best.size)
2160 case NFT_SET_POL_MEMORY:
2161 if (est.size < best.size)
2163 if (est.size == best.size && est.class < best.class)
2170 if (!try_module_get(ops->owner))
2173 module_put(bops->owner);
2182 return ERR_PTR(-EOPNOTSUPP);
2185 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2186 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2187 [NFTA_SET_NAME] = { .type = NLA_STRING,
2188 .len = IFNAMSIZ - 1 },
2189 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2190 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2191 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2192 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2193 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2194 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2195 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2196 [NFTA_SET_ID] = { .type = NLA_U32 },
2199 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2200 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2203 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx,
2204 const struct sk_buff *skb,
2205 const struct nlmsghdr *nlh,
2206 const struct nlattr * const nla[])
2208 struct net *net = sock_net(skb->sk);
2209 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2210 struct nft_af_info *afi = NULL;
2211 struct nft_table *table = NULL;
2213 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2214 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2216 return PTR_ERR(afi);
2219 if (nla[NFTA_SET_TABLE] != NULL) {
2221 return -EAFNOSUPPORT;
2223 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2225 return PTR_ERR(table);
2226 if (table->flags & NFT_TABLE_INACTIVE)
2230 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2234 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2235 const struct nlattr *nla)
2237 struct nft_set *set;
2240 return ERR_PTR(-EINVAL);
2242 list_for_each_entry(set, &table->sets, list) {
2243 if (!nla_strcmp(nla, set->name))
2246 return ERR_PTR(-ENOENT);
2249 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2250 const struct nlattr *nla)
2252 struct nft_trans *trans;
2253 u32 id = ntohl(nla_get_be32(nla));
2255 list_for_each_entry(trans, &net->nft.commit_list, list) {
2256 if (trans->msg_type == NFT_MSG_NEWSET &&
2257 id == nft_trans_set_id(trans))
2258 return nft_trans_set(trans);
2260 return ERR_PTR(-ENOENT);
2263 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2266 const struct nft_set *i;
2268 unsigned long *inuse;
2269 unsigned int n = 0, min = 0;
2271 p = strnchr(name, IFNAMSIZ, '%');
2273 if (p[1] != 'd' || strchr(p + 2, '%'))
2276 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2280 list_for_each_entry(i, &ctx->table->sets, list) {
2283 if (!sscanf(i->name, name, &tmp))
2285 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2288 set_bit(tmp - min, inuse);
2291 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2292 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2293 min += BITS_PER_BYTE * PAGE_SIZE;
2294 memset(inuse, 0, PAGE_SIZE);
2297 free_page((unsigned long)inuse);
2300 snprintf(set->name, sizeof(set->name), name, min + n);
2301 list_for_each_entry(i, &ctx->table->sets, list) {
2302 if (!strcmp(set->name, i->name))
2308 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2309 const struct nft_set *set, u16 event, u16 flags)
2311 struct nfgenmsg *nfmsg;
2312 struct nlmsghdr *nlh;
2313 struct nlattr *desc;
2314 u32 portid = ctx->portid;
2317 event |= NFNL_SUBSYS_NFTABLES << 8;
2318 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2321 goto nla_put_failure;
2323 nfmsg = nlmsg_data(nlh);
2324 nfmsg->nfgen_family = ctx->afi->family;
2325 nfmsg->version = NFNETLINK_V0;
2326 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2328 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2329 goto nla_put_failure;
2330 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2331 goto nla_put_failure;
2332 if (set->flags != 0)
2333 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2334 goto nla_put_failure;
2336 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2337 goto nla_put_failure;
2338 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2339 goto nla_put_failure;
2340 if (set->flags & NFT_SET_MAP) {
2341 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2342 goto nla_put_failure;
2343 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2344 goto nla_put_failure;
2347 desc = nla_nest_start(skb, NFTA_SET_DESC);
2349 goto nla_put_failure;
2351 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2352 goto nla_put_failure;
2353 nla_nest_end(skb, desc);
2355 return nlmsg_end(skb, nlh);
2358 nlmsg_trim(skb, nlh);
2362 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2363 const struct nft_set *set,
2364 int event, gfp_t gfp_flags)
2366 struct sk_buff *skb;
2367 u32 portid = ctx->portid;
2371 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2375 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2379 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2385 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2386 ctx->report, gfp_flags);
2389 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2393 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2395 const struct nft_set *set;
2396 unsigned int idx, s_idx = cb->args[0];
2397 struct nft_af_info *afi;
2398 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2399 struct net *net = sock_net(skb->sk);
2400 int cur_family = cb->args[3];
2401 struct nft_ctx *ctx = cb->data, ctx_set;
2407 cb->seq = net->nft.base_seq;
2409 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2410 if (ctx->afi && ctx->afi != afi)
2414 if (afi->family != cur_family)
2419 list_for_each_entry_rcu(table, &afi->tables, list) {
2420 if (ctx->table && ctx->table != table)
2424 if (cur_table != table)
2430 list_for_each_entry_rcu(set, &table->sets, list) {
2435 ctx_set.table = table;
2437 if (nf_tables_fill_set(skb, &ctx_set, set,
2441 cb->args[2] = (unsigned long) table;
2442 cb->args[3] = afi->family;
2445 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2459 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2465 static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
2466 const struct nlmsghdr *nlh,
2467 const struct nlattr * const nla[])
2469 const struct nft_set *set;
2471 struct sk_buff *skb2;
2472 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2475 /* Verify existance before starting dump */
2476 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2480 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2481 struct netlink_dump_control c = {
2482 .dump = nf_tables_dump_sets,
2483 .done = nf_tables_dump_sets_done,
2485 struct nft_ctx *ctx_dump;
2487 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2488 if (ctx_dump == NULL)
2494 return netlink_dump_start(nlsk, skb, nlh, &c);
2497 /* Only accept unspec with dump */
2498 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2499 return -EAFNOSUPPORT;
2501 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2503 return PTR_ERR(set);
2504 if (set->flags & NFT_SET_INACTIVE)
2507 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2511 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2515 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2522 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2523 struct nft_set_desc *desc,
2524 const struct nlattr *nla)
2526 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2529 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2533 if (da[NFTA_SET_DESC_SIZE] != NULL)
2534 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2539 static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
2540 const struct nlmsghdr *nlh,
2541 const struct nlattr * const nla[])
2543 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2544 const struct nft_set_ops *ops;
2545 struct nft_af_info *afi;
2546 struct net *net = sock_net(skb->sk);
2547 struct nft_table *table;
2548 struct nft_set *set;
2550 char name[IFNAMSIZ];
2553 u32 ktype, dtype, flags, policy;
2554 struct nft_set_desc desc;
2557 if (nla[NFTA_SET_TABLE] == NULL ||
2558 nla[NFTA_SET_NAME] == NULL ||
2559 nla[NFTA_SET_KEY_LEN] == NULL ||
2560 nla[NFTA_SET_ID] == NULL)
2563 memset(&desc, 0, sizeof(desc));
2565 ktype = NFT_DATA_VALUE;
2566 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2567 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2568 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2572 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2573 if (desc.klen == 0 || desc.klen > FIELD_SIZEOF(struct nft_data, data))
2577 if (nla[NFTA_SET_FLAGS] != NULL) {
2578 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2579 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2580 NFT_SET_INTERVAL | NFT_SET_MAP))
2585 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2586 if (!(flags & NFT_SET_MAP))
2589 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2590 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2591 dtype != NFT_DATA_VERDICT)
2594 if (dtype != NFT_DATA_VERDICT) {
2595 if (nla[NFTA_SET_DATA_LEN] == NULL)
2597 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2598 if (desc.dlen == 0 ||
2599 desc.dlen > FIELD_SIZEOF(struct nft_data, data))
2602 desc.dlen = sizeof(struct nft_data);
2603 } else if (flags & NFT_SET_MAP)
2606 policy = NFT_SET_POL_PERFORMANCE;
2607 if (nla[NFTA_SET_POLICY] != NULL)
2608 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2610 if (nla[NFTA_SET_DESC] != NULL) {
2611 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2616 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2618 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2620 return PTR_ERR(afi);
2622 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2624 return PTR_ERR(table);
2626 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
2628 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2630 if (PTR_ERR(set) != -ENOENT)
2631 return PTR_ERR(set);
2636 if (nlh->nlmsg_flags & NLM_F_EXCL)
2638 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2643 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2646 ops = nft_select_set_ops(nla, &desc, policy);
2648 return PTR_ERR(ops);
2651 if (ops->privsize != NULL)
2652 size = ops->privsize(nla);
2655 set = kzalloc(sizeof(*set) + size, GFP_KERNEL);
2659 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2660 err = nf_tables_set_alloc_name(&ctx, set, name);
2664 INIT_LIST_HEAD(&set->bindings);
2667 set->klen = desc.klen;
2669 set->dlen = desc.dlen;
2671 set->size = desc.size;
2673 err = ops->init(set, &desc, nla);
2677 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2681 list_add_tail_rcu(&set->list, &table->sets);
2688 module_put(ops->owner);
2692 static void nft_set_destroy(struct nft_set *set)
2694 set->ops->destroy(set);
2695 module_put(set->ops->owner);
2699 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2701 list_del_rcu(&set->list);
2702 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
2703 nft_set_destroy(set);
2706 static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
2707 const struct nlmsghdr *nlh,
2708 const struct nlattr * const nla[])
2710 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2711 struct nft_set *set;
2715 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2716 return -EAFNOSUPPORT;
2717 if (nla[NFTA_SET_TABLE] == NULL)
2720 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2724 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2726 return PTR_ERR(set);
2727 if (set->flags & NFT_SET_INACTIVE)
2729 if (!list_empty(&set->bindings))
2732 return nft_delset(&ctx, set);
2735 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2736 const struct nft_set *set,
2737 const struct nft_set_iter *iter,
2738 const struct nft_set_elem *elem)
2740 enum nft_registers dreg;
2742 dreg = nft_type_to_reg(set->dtype);
2743 return nft_validate_data_load(ctx, dreg, &elem->data,
2744 set->dtype == NFT_DATA_VERDICT ?
2745 NFT_DATA_VERDICT : NFT_DATA_VALUE);
2748 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2749 struct nft_set_binding *binding)
2751 struct nft_set_binding *i;
2752 struct nft_set_iter iter;
2754 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2757 if (set->flags & NFT_SET_MAP) {
2758 /* If the set is already bound to the same chain all
2759 * jumps are already validated for that chain.
2761 list_for_each_entry(i, &set->bindings, list) {
2762 if (i->chain == binding->chain)
2769 iter.fn = nf_tables_bind_check_setelem;
2771 set->ops->walk(ctx, set, &iter);
2773 /* Destroy anonymous sets if binding fails */
2774 if (set->flags & NFT_SET_ANONYMOUS)
2775 nf_tables_set_destroy(ctx, set);
2781 binding->chain = ctx->chain;
2782 list_add_tail_rcu(&binding->list, &set->bindings);
2786 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2787 struct nft_set_binding *binding)
2789 list_del_rcu(&binding->list);
2791 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2792 !(set->flags & NFT_SET_INACTIVE))
2793 nf_tables_set_destroy(ctx, set);
2800 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
2801 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
2802 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
2803 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
2806 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
2807 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
2808 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
2809 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
2810 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
2813 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx,
2814 const struct sk_buff *skb,
2815 const struct nlmsghdr *nlh,
2816 const struct nlattr * const nla[],
2819 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2820 struct nft_af_info *afi;
2821 struct nft_table *table;
2822 struct net *net = sock_net(skb->sk);
2824 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2826 return PTR_ERR(afi);
2828 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
2830 return PTR_ERR(table);
2831 if (!trans && (table->flags & NFT_TABLE_INACTIVE))
2834 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2838 static int nf_tables_fill_setelem(struct sk_buff *skb,
2839 const struct nft_set *set,
2840 const struct nft_set_elem *elem)
2842 unsigned char *b = skb_tail_pointer(skb);
2843 struct nlattr *nest;
2845 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
2847 goto nla_put_failure;
2849 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE,
2851 goto nla_put_failure;
2853 if (set->flags & NFT_SET_MAP &&
2854 !(elem->flags & NFT_SET_ELEM_INTERVAL_END) &&
2855 nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data,
2856 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
2858 goto nla_put_failure;
2860 if (elem->flags != 0)
2861 if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags)))
2862 goto nla_put_failure;
2864 nla_nest_end(skb, nest);
2872 struct nft_set_dump_args {
2873 const struct netlink_callback *cb;
2874 struct nft_set_iter iter;
2875 struct sk_buff *skb;
2878 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
2879 const struct nft_set *set,
2880 const struct nft_set_iter *iter,
2881 const struct nft_set_elem *elem)
2883 struct nft_set_dump_args *args;
2885 args = container_of(iter, struct nft_set_dump_args, iter);
2886 return nf_tables_fill_setelem(args->skb, set, elem);
2889 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
2891 const struct nft_set *set;
2892 struct nft_set_dump_args args;
2894 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
2895 struct nfgenmsg *nfmsg;
2896 struct nlmsghdr *nlh;
2897 struct nlattr *nest;
2901 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
2902 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
2906 err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla,
2911 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2913 return PTR_ERR(set);
2914 if (set->flags & NFT_SET_INACTIVE)
2917 event = NFT_MSG_NEWSETELEM;
2918 event |= NFNL_SUBSYS_NFTABLES << 8;
2919 portid = NETLINK_CB(cb->skb).portid;
2920 seq = cb->nlh->nlmsg_seq;
2922 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2925 goto nla_put_failure;
2927 nfmsg = nlmsg_data(nlh);
2928 nfmsg->nfgen_family = ctx.afi->family;
2929 nfmsg->version = NFNETLINK_V0;
2930 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
2932 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
2933 goto nla_put_failure;
2934 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
2935 goto nla_put_failure;
2937 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2939 goto nla_put_failure;
2943 args.iter.skip = cb->args[0];
2944 args.iter.count = 0;
2946 args.iter.fn = nf_tables_dump_setelem;
2947 set->ops->walk(&ctx, set, &args.iter);
2949 nla_nest_end(skb, nest);
2950 nlmsg_end(skb, nlh);
2952 if (args.iter.err && args.iter.err != -EMSGSIZE)
2953 return args.iter.err;
2954 if (args.iter.count == cb->args[0])
2957 cb->args[0] = args.iter.count;
2964 static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb,
2965 const struct nlmsghdr *nlh,
2966 const struct nlattr * const nla[])
2968 const struct nft_set *set;
2972 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
2976 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2978 return PTR_ERR(set);
2979 if (set->flags & NFT_SET_INACTIVE)
2982 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2983 struct netlink_dump_control c = {
2984 .dump = nf_tables_dump_set,
2986 return netlink_dump_start(nlsk, skb, nlh, &c);
2991 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
2992 const struct nft_ctx *ctx, u32 seq,
2993 u32 portid, int event, u16 flags,
2994 const struct nft_set *set,
2995 const struct nft_set_elem *elem)
2997 struct nfgenmsg *nfmsg;
2998 struct nlmsghdr *nlh;
2999 struct nlattr *nest;
3002 event |= NFNL_SUBSYS_NFTABLES << 8;
3003 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3006 goto nla_put_failure;
3008 nfmsg = nlmsg_data(nlh);
3009 nfmsg->nfgen_family = ctx->afi->family;
3010 nfmsg->version = NFNETLINK_V0;
3011 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3013 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3014 goto nla_put_failure;
3015 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3016 goto nla_put_failure;
3018 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3020 goto nla_put_failure;
3022 err = nf_tables_fill_setelem(skb, set, elem);
3024 goto nla_put_failure;
3026 nla_nest_end(skb, nest);
3028 return nlmsg_end(skb, nlh);
3031 nlmsg_trim(skb, nlh);
3035 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3036 const struct nft_set *set,
3037 const struct nft_set_elem *elem,
3038 int event, u16 flags)
3040 struct net *net = ctx->net;
3041 u32 portid = ctx->portid;
3042 struct sk_buff *skb;
3045 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3049 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3053 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3060 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3064 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3068 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3070 struct nft_set *set)
3072 struct nft_trans *trans;
3074 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3078 nft_trans_elem_set(trans) = set;
3082 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3083 const struct nlattr *attr)
3085 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3086 struct nft_data_desc d1, d2;
3087 struct nft_set_elem elem;
3088 struct nft_set_binding *binding;
3089 enum nft_registers dreg;
3090 struct nft_trans *trans;
3093 if (set->size && set->nelems == set->size)
3096 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3097 nft_set_elem_policy);
3101 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3105 if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
3106 elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
3107 if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END)
3111 if (set->flags & NFT_SET_MAP) {
3112 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3113 !(elem.flags & NFT_SET_ELEM_INTERVAL_END))
3115 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3116 elem.flags & NFT_SET_ELEM_INTERVAL_END)
3119 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3123 err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]);
3127 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3131 if (set->ops->get(set, &elem) == 0)
3134 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3135 err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]);
3140 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3143 dreg = nft_type_to_reg(set->dtype);
3144 list_for_each_entry(binding, &set->bindings, list) {
3145 struct nft_ctx bind_ctx = {
3147 .table = ctx->table,
3148 .chain = (struct nft_chain *)binding->chain,
3151 err = nft_validate_data_load(&bind_ctx, dreg,
3152 &elem.data, d2.type);
3158 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3162 err = set->ops->insert(set, &elem);
3166 nft_trans_elem(trans) = elem;
3167 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3173 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3174 nft_data_uninit(&elem.data, d2.type);
3176 nft_data_uninit(&elem.key, d1.type);
3181 static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb,
3182 const struct nlmsghdr *nlh,
3183 const struct nlattr * const nla[])
3185 struct net *net = sock_net(skb->sk);
3186 const struct nlattr *attr;
3187 struct nft_set *set;
3191 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3194 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, true);
3198 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3200 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3201 set = nf_tables_set_lookup_byid(net,
3202 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3205 return PTR_ERR(set);
3208 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3211 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3212 err = nft_add_set_elem(&ctx, set, attr);
3221 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3222 const struct nlattr *attr)
3224 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3225 struct nft_data_desc desc;
3226 struct nft_set_elem elem;
3227 struct nft_trans *trans;
3230 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3231 nft_set_elem_policy);
3236 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3239 err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]);
3244 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3247 err = set->ops->get(set, &elem);
3251 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3252 if (trans == NULL) {
3257 nft_trans_elem(trans) = elem;
3258 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3261 nft_data_uninit(&elem.key, desc.type);
3266 static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb,
3267 const struct nlmsghdr *nlh,
3268 const struct nlattr * const nla[])
3270 const struct nlattr *attr;
3271 struct nft_set *set;
3275 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3278 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
3282 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3284 return PTR_ERR(set);
3285 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3288 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3289 err = nft_del_setelem(&ctx, set, attr);
3298 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
3299 u32 portid, u32 seq)
3301 struct nlmsghdr *nlh;
3302 struct nfgenmsg *nfmsg;
3303 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
3305 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
3307 goto nla_put_failure;
3309 nfmsg = nlmsg_data(nlh);
3310 nfmsg->nfgen_family = AF_UNSPEC;
3311 nfmsg->version = NFNETLINK_V0;
3312 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3314 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
3315 goto nla_put_failure;
3317 return nlmsg_end(skb, nlh);
3320 nlmsg_trim(skb, nlh);
3324 static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
3326 struct nlmsghdr *nlh = nlmsg_hdr(skb);
3327 struct sk_buff *skb2;
3330 if (nlmsg_report(nlh) &&
3331 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3335 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3339 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3346 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
3347 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
3350 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
3356 static int nf_tables_getgen(struct sock *nlsk, struct sk_buff *skb,
3357 const struct nlmsghdr *nlh,
3358 const struct nlattr * const nla[])
3360 struct net *net = sock_net(skb->sk);
3361 struct sk_buff *skb2;
3364 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3368 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3373 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3379 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3380 [NFT_MSG_NEWTABLE] = {
3381 .call_batch = nf_tables_newtable,
3382 .attr_count = NFTA_TABLE_MAX,
3383 .policy = nft_table_policy,
3385 [NFT_MSG_GETTABLE] = {
3386 .call = nf_tables_gettable,
3387 .attr_count = NFTA_TABLE_MAX,
3388 .policy = nft_table_policy,
3390 [NFT_MSG_DELTABLE] = {
3391 .call_batch = nf_tables_deltable,
3392 .attr_count = NFTA_TABLE_MAX,
3393 .policy = nft_table_policy,
3395 [NFT_MSG_NEWCHAIN] = {
3396 .call_batch = nf_tables_newchain,
3397 .attr_count = NFTA_CHAIN_MAX,
3398 .policy = nft_chain_policy,
3400 [NFT_MSG_GETCHAIN] = {
3401 .call = nf_tables_getchain,
3402 .attr_count = NFTA_CHAIN_MAX,
3403 .policy = nft_chain_policy,
3405 [NFT_MSG_DELCHAIN] = {
3406 .call_batch = nf_tables_delchain,
3407 .attr_count = NFTA_CHAIN_MAX,
3408 .policy = nft_chain_policy,
3410 [NFT_MSG_NEWRULE] = {
3411 .call_batch = nf_tables_newrule,
3412 .attr_count = NFTA_RULE_MAX,
3413 .policy = nft_rule_policy,
3415 [NFT_MSG_GETRULE] = {
3416 .call = nf_tables_getrule,
3417 .attr_count = NFTA_RULE_MAX,
3418 .policy = nft_rule_policy,
3420 [NFT_MSG_DELRULE] = {
3421 .call_batch = nf_tables_delrule,
3422 .attr_count = NFTA_RULE_MAX,
3423 .policy = nft_rule_policy,
3425 [NFT_MSG_NEWSET] = {
3426 .call_batch = nf_tables_newset,
3427 .attr_count = NFTA_SET_MAX,
3428 .policy = nft_set_policy,
3430 [NFT_MSG_GETSET] = {
3431 .call = nf_tables_getset,
3432 .attr_count = NFTA_SET_MAX,
3433 .policy = nft_set_policy,
3435 [NFT_MSG_DELSET] = {
3436 .call_batch = nf_tables_delset,
3437 .attr_count = NFTA_SET_MAX,
3438 .policy = nft_set_policy,
3440 [NFT_MSG_NEWSETELEM] = {
3441 .call_batch = nf_tables_newsetelem,
3442 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3443 .policy = nft_set_elem_list_policy,
3445 [NFT_MSG_GETSETELEM] = {
3446 .call = nf_tables_getsetelem,
3447 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3448 .policy = nft_set_elem_list_policy,
3450 [NFT_MSG_DELSETELEM] = {
3451 .call_batch = nf_tables_delsetelem,
3452 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3453 .policy = nft_set_elem_list_policy,
3455 [NFT_MSG_GETGEN] = {
3456 .call = nf_tables_getgen,
3460 static void nft_chain_commit_update(struct nft_trans *trans)
3462 struct nft_base_chain *basechain;
3464 if (nft_trans_chain_name(trans)[0])
3465 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3467 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3470 basechain = nft_base_chain(trans->ctx.chain);
3471 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3473 switch (nft_trans_chain_policy(trans)) {
3476 basechain->policy = nft_trans_chain_policy(trans);
3481 /* Schedule objects for release via rcu to make sure no packets are accesing
3484 static void nf_tables_commit_release_rcu(struct rcu_head *rt)
3486 struct nft_trans *trans = container_of(rt, struct nft_trans, rcu_head);
3488 switch (trans->msg_type) {
3489 case NFT_MSG_DELTABLE:
3490 nf_tables_table_destroy(&trans->ctx);
3492 case NFT_MSG_DELCHAIN:
3493 nf_tables_chain_destroy(trans->ctx.chain);
3495 case NFT_MSG_DELRULE:
3496 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3498 case NFT_MSG_DELSET:
3499 nft_set_destroy(nft_trans_set(trans));
3505 static int nf_tables_commit(struct sk_buff *skb)
3507 struct net *net = sock_net(skb->sk);
3508 struct nft_trans *trans, *next;
3509 struct nft_trans_elem *te;
3511 /* Bump generation counter, invalidate any dump in progress */
3512 while (++net->nft.base_seq == 0);
3514 /* A new generation has just started */
3515 net->nft.gencursor = gencursor_next(net);
3517 /* Make sure all packets have left the previous generation before
3518 * purging old rules.
3522 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3523 switch (trans->msg_type) {
3524 case NFT_MSG_NEWTABLE:
3525 if (nft_trans_table_update(trans)) {
3526 if (!nft_trans_table_enable(trans)) {
3527 nf_tables_table_disable(trans->ctx.afi,
3529 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3532 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3534 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
3535 nft_trans_destroy(trans);
3537 case NFT_MSG_DELTABLE:
3538 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
3540 case NFT_MSG_NEWCHAIN:
3541 if (nft_trans_chain_update(trans))
3542 nft_chain_commit_update(trans);
3544 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
3546 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
3547 nft_trans_destroy(trans);
3549 case NFT_MSG_DELCHAIN:
3550 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
3551 nf_tables_unregister_hooks(trans->ctx.table,
3553 trans->ctx.afi->nops);
3555 case NFT_MSG_NEWRULE:
3556 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3557 nf_tables_rule_notify(&trans->ctx,
3558 nft_trans_rule(trans),
3560 nft_trans_destroy(trans);
3562 case NFT_MSG_DELRULE:
3563 list_del_rcu(&nft_trans_rule(trans)->list);
3564 nf_tables_rule_notify(&trans->ctx,
3565 nft_trans_rule(trans),
3568 case NFT_MSG_NEWSET:
3569 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
3570 /* This avoids hitting -EBUSY when deleting the table
3571 * from the transaction.
3573 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
3574 !list_empty(&nft_trans_set(trans)->bindings))
3575 trans->ctx.table->use--;
3577 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3578 NFT_MSG_NEWSET, GFP_KERNEL);
3579 nft_trans_destroy(trans);
3581 case NFT_MSG_DELSET:
3582 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3583 NFT_MSG_DELSET, GFP_KERNEL);
3585 case NFT_MSG_NEWSETELEM:
3586 nf_tables_setelem_notify(&trans->ctx,
3587 nft_trans_elem_set(trans),
3588 &nft_trans_elem(trans),
3589 NFT_MSG_NEWSETELEM, 0);
3590 nft_trans_destroy(trans);
3592 case NFT_MSG_DELSETELEM:
3593 te = (struct nft_trans_elem *)trans->data;
3594 nf_tables_setelem_notify(&trans->ctx, te->set,
3596 NFT_MSG_DELSETELEM, 0);
3597 te->set->ops->get(te->set, &te->elem);
3598 te->set->ops->remove(te->set, &te->elem);
3599 nft_data_uninit(&te->elem.key, NFT_DATA_VALUE);
3600 if (te->elem.flags & NFT_SET_MAP) {
3601 nft_data_uninit(&te->elem.data,
3604 nft_trans_destroy(trans);
3609 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3610 list_del(&trans->list);
3611 trans->ctx.nla = NULL;
3612 call_rcu(&trans->rcu_head, nf_tables_commit_release_rcu);
3615 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
3620 /* Schedule objects for release via rcu to make sure no packets are accesing
3623 static void nf_tables_abort_release_rcu(struct rcu_head *rt)
3625 struct nft_trans *trans = container_of(rt, struct nft_trans, rcu_head);
3627 switch (trans->msg_type) {
3628 case NFT_MSG_NEWTABLE:
3629 nf_tables_table_destroy(&trans->ctx);
3631 case NFT_MSG_NEWCHAIN:
3632 nf_tables_chain_destroy(trans->ctx.chain);
3634 case NFT_MSG_NEWRULE:
3635 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3637 case NFT_MSG_NEWSET:
3638 nft_set_destroy(nft_trans_set(trans));
3644 static int nf_tables_abort(struct sk_buff *skb)
3646 struct net *net = sock_net(skb->sk);
3647 struct nft_trans *trans, *next;
3648 struct nft_set *set;
3650 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3651 switch (trans->msg_type) {
3652 case NFT_MSG_NEWTABLE:
3653 if (nft_trans_table_update(trans)) {
3654 if (nft_trans_table_enable(trans)) {
3655 nf_tables_table_disable(trans->ctx.afi,
3657 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3659 nft_trans_destroy(trans);
3661 list_del_rcu(&trans->ctx.table->list);
3664 case NFT_MSG_DELTABLE:
3665 list_add_tail_rcu(&trans->ctx.table->list,
3666 &trans->ctx.afi->tables);
3667 nft_trans_destroy(trans);
3669 case NFT_MSG_NEWCHAIN:
3670 if (nft_trans_chain_update(trans)) {
3671 if (nft_trans_chain_stats(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);
3722 list_for_each_entry_safe_reverse(trans, next,
3723 &net->nft.commit_list, list) {
3724 list_del(&trans->list);
3725 trans->ctx.nla = NULL;
3726 call_rcu(&trans->rcu_head, nf_tables_abort_release_rcu);
3732 static const struct nfnetlink_subsystem nf_tables_subsys = {
3733 .name = "nf_tables",
3734 .subsys_id = NFNL_SUBSYS_NFTABLES,
3735 .cb_count = NFT_MSG_MAX,
3737 .commit = nf_tables_commit,
3738 .abort = nf_tables_abort,
3742 * Loop detection - walk through the ruleset beginning at the destination chain
3743 * of a new jump until either the source chain is reached (loop) or all
3744 * reachable chains have been traversed.
3746 * The loop check is performed whenever a new jump verdict is added to an
3747 * expression or verdict map or a verdict map is bound to a new chain.
3750 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3751 const struct nft_chain *chain);
3753 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
3754 const struct nft_set *set,
3755 const struct nft_set_iter *iter,
3756 const struct nft_set_elem *elem)
3758 if (elem->flags & NFT_SET_ELEM_INTERVAL_END)
3761 switch (elem->data.verdict) {
3764 return nf_tables_check_loops(ctx, elem->data.chain);
3770 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3771 const struct nft_chain *chain)
3773 const struct nft_rule *rule;
3774 const struct nft_expr *expr, *last;
3775 const struct nft_set *set;
3776 struct nft_set_binding *binding;
3777 struct nft_set_iter iter;
3779 if (ctx->chain == chain)
3782 list_for_each_entry(rule, &chain->rules, list) {
3783 nft_rule_for_each_expr(expr, last, rule) {
3784 const struct nft_data *data = NULL;
3787 if (!expr->ops->validate)
3790 err = expr->ops->validate(ctx, expr, &data);
3797 switch (data->verdict) {
3800 err = nf_tables_check_loops(ctx, data->chain);
3809 list_for_each_entry(set, &ctx->table->sets, list) {
3810 if (!(set->flags & NFT_SET_MAP) ||
3811 set->dtype != NFT_DATA_VERDICT)
3814 list_for_each_entry(binding, &set->bindings, list) {
3815 if (binding->chain != chain)
3821 iter.fn = nf_tables_loop_check_setelem;
3823 set->ops->walk(ctx, set, &iter);
3833 * nft_validate_input_register - validate an expressions' input register
3835 * @reg: the register number
3837 * Validate that the input register is one of the general purpose
3840 int nft_validate_input_register(enum nft_registers reg)
3842 if (reg <= NFT_REG_VERDICT)
3844 if (reg > NFT_REG_MAX)
3848 EXPORT_SYMBOL_GPL(nft_validate_input_register);
3851 * nft_validate_output_register - validate an expressions' output register
3853 * @reg: the register number
3855 * Validate that the output register is one of the general purpose
3856 * registers or the verdict register.
3858 int nft_validate_output_register(enum nft_registers reg)
3860 if (reg < NFT_REG_VERDICT)
3862 if (reg > NFT_REG_MAX)
3866 EXPORT_SYMBOL_GPL(nft_validate_output_register);
3869 * nft_validate_data_load - validate an expressions' data load
3871 * @ctx: context of the expression performing the load
3872 * @reg: the destination register number
3873 * @data: the data to load
3874 * @type: the data type
3876 * Validate that a data load uses the appropriate data type for
3877 * the destination register. A value of NULL for the data means
3878 * that its runtime gathered data, which is always of type
3881 int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg,
3882 const struct nft_data *data,
3883 enum nft_data_types type)
3888 case NFT_REG_VERDICT:
3889 if (data == NULL || type != NFT_DATA_VERDICT)
3892 if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) {
3893 err = nf_tables_check_loops(ctx, data->chain);
3897 if (ctx->chain->level + 1 > data->chain->level) {
3898 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
3900 data->chain->level = ctx->chain->level + 1;
3906 if (data != NULL && type != NFT_DATA_VALUE)
3911 EXPORT_SYMBOL_GPL(nft_validate_data_load);
3913 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
3914 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
3915 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
3916 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3919 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
3920 struct nft_data_desc *desc, const struct nlattr *nla)
3922 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
3923 struct nft_chain *chain;
3926 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
3930 if (!tb[NFTA_VERDICT_CODE])
3932 data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
3934 switch (data->verdict) {
3936 switch (data->verdict & NF_VERDICT_MASK) {
3948 desc->len = sizeof(data->verdict);
3952 if (!tb[NFTA_VERDICT_CHAIN])
3954 chain = nf_tables_chain_lookup(ctx->table,
3955 tb[NFTA_VERDICT_CHAIN]);
3957 return PTR_ERR(chain);
3958 if (chain->flags & NFT_BASE_CHAIN)
3962 data->chain = chain;
3963 desc->len = sizeof(data);
3967 desc->type = NFT_DATA_VERDICT;
3971 static void nft_verdict_uninit(const struct nft_data *data)
3973 switch (data->verdict) {
3981 static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data)
3983 struct nlattr *nest;
3985 nest = nla_nest_start(skb, NFTA_DATA_VERDICT);
3987 goto nla_put_failure;
3989 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict)))
3990 goto nla_put_failure;
3992 switch (data->verdict) {
3995 if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name))
3996 goto nla_put_failure;
3998 nla_nest_end(skb, nest);
4005 static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data,
4006 struct nft_data_desc *desc, const struct nlattr *nla)
4013 if (len > sizeof(data->data))
4016 nla_memcpy(data->data, nla, sizeof(data->data));
4017 desc->type = NFT_DATA_VALUE;
4022 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
4025 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
4028 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
4029 [NFTA_DATA_VALUE] = { .type = NLA_BINARY,
4030 .len = FIELD_SIZEOF(struct nft_data, data) },
4031 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
4035 * nft_data_init - parse nf_tables data netlink attributes
4037 * @ctx: context of the expression using the data
4038 * @data: destination struct nft_data
4039 * @desc: data description
4040 * @nla: netlink attribute containing data
4042 * Parse the netlink data attributes and initialize a struct nft_data.
4043 * The type and length of data are returned in the data description.
4045 * The caller can indicate that it only wants to accept data of type
4046 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4048 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
4049 struct nft_data_desc *desc, const struct nlattr *nla)
4051 struct nlattr *tb[NFTA_DATA_MAX + 1];
4054 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
4058 if (tb[NFTA_DATA_VALUE])
4059 return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
4060 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
4061 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
4064 EXPORT_SYMBOL_GPL(nft_data_init);
4067 * nft_data_uninit - release a nft_data item
4069 * @data: struct nft_data to release
4070 * @type: type of data
4072 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4073 * all others need to be released by calling this function.
4075 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
4078 case NFT_DATA_VALUE:
4080 case NFT_DATA_VERDICT:
4081 return nft_verdict_uninit(data);
4086 EXPORT_SYMBOL_GPL(nft_data_uninit);
4088 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4089 enum nft_data_types type, unsigned int len)
4091 struct nlattr *nest;
4094 nest = nla_nest_start(skb, attr);
4099 case NFT_DATA_VALUE:
4100 err = nft_value_dump(skb, data, len);
4102 case NFT_DATA_VERDICT:
4103 err = nft_verdict_dump(skb, data);
4110 nla_nest_end(skb, nest);
4113 EXPORT_SYMBOL_GPL(nft_data_dump);
4115 static int nf_tables_init_net(struct net *net)
4117 INIT_LIST_HEAD(&net->nft.af_info);
4118 INIT_LIST_HEAD(&net->nft.commit_list);
4119 net->nft.base_seq = 1;
4123 static struct pernet_operations nf_tables_net_ops = {
4124 .init = nf_tables_init_net,
4127 static int __init nf_tables_module_init(void)
4131 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4138 err = nf_tables_core_module_init();
4142 err = nfnetlink_subsys_register(&nf_tables_subsys);
4146 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4147 return register_pernet_subsys(&nf_tables_net_ops);
4149 nf_tables_core_module_exit();
4156 static void __exit nf_tables_module_exit(void)
4158 unregister_pernet_subsys(&nf_tables_net_ops);
4159 nfnetlink_subsys_unregister(&nf_tables_subsys);
4160 nf_tables_core_module_exit();
4164 module_init(nf_tables_module_init);
4165 module_exit(nf_tables_module_exit);
4167 MODULE_LICENSE("GPL");
4168 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4169 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);