2 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/list.h>
14 #include <linux/skbuff.h>
15 #include <linux/netlink.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_tables_core.h>
20 #include <net/netfilter/nf_tables.h>
21 #include <net/net_namespace.h>
24 static LIST_HEAD(nf_tables_expressions);
27 * nft_register_afinfo - register nf_tables address family info
29 * @afi: address family info to register
31 * Register the address family for use with nf_tables. Returns zero on
32 * success or a negative errno code otherwise.
34 int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
36 INIT_LIST_HEAD(&afi->tables);
37 nfnl_lock(NFNL_SUBSYS_NFTABLES);
38 list_add_tail_rcu(&afi->list, &net->nft.af_info);
39 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
42 EXPORT_SYMBOL_GPL(nft_register_afinfo);
44 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi);
47 * nft_unregister_afinfo - unregister nf_tables address family info
49 * @afi: address family info to unregister
51 * Unregister the address family for use with nf_tables.
53 void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi)
55 nfnl_lock(NFNL_SUBSYS_NFTABLES);
56 __nft_release_afinfo(net, afi);
57 list_del_rcu(&afi->list);
58 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
60 EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
62 static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
64 struct nft_af_info *afi;
66 list_for_each_entry(afi, &net->nft.af_info, list) {
67 if (afi->family == family)
73 static struct nft_af_info *
74 nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
76 struct nft_af_info *afi;
78 afi = nft_afinfo_lookup(net, family);
83 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
84 request_module("nft-afinfo-%u", family);
85 nfnl_lock(NFNL_SUBSYS_NFTABLES);
86 afi = nft_afinfo_lookup(net, family);
88 return ERR_PTR(-EAGAIN);
91 return ERR_PTR(-EAFNOSUPPORT);
94 static void nft_ctx_init(struct nft_ctx *ctx,
96 const struct sk_buff *skb,
97 const struct nlmsghdr *nlh,
98 struct nft_af_info *afi,
99 struct nft_table *table,
100 struct nft_chain *chain,
101 const struct nlattr * const *nla)
108 ctx->portid = NETLINK_CB(skb).portid;
109 ctx->report = nlmsg_report(nlh);
110 ctx->seq = nlh->nlmsg_seq;
113 static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type,
116 struct nft_trans *trans;
118 trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL);
122 trans->msg_type = msg_type;
128 static void nft_trans_destroy(struct nft_trans *trans)
130 list_del(&trans->list);
134 static int nft_register_basechain(struct nft_base_chain *basechain,
135 unsigned int hook_nops)
137 struct net *net = read_pnet(&basechain->pnet);
139 if (basechain->flags & NFT_BASECHAIN_DISABLED)
142 return nf_register_net_hooks(net, basechain->ops, hook_nops);
145 static void nft_unregister_basechain(struct nft_base_chain *basechain,
146 unsigned int hook_nops)
148 struct net *net = read_pnet(&basechain->pnet);
150 if (basechain->flags & NFT_BASECHAIN_DISABLED)
153 nf_unregister_net_hooks(net, basechain->ops, hook_nops);
156 static int nf_tables_register_hooks(const struct nft_table *table,
157 struct nft_chain *chain,
158 unsigned int hook_nops)
160 if (table->flags & NFT_TABLE_F_DORMANT ||
161 !(chain->flags & NFT_BASE_CHAIN))
164 return nft_register_basechain(nft_base_chain(chain), hook_nops);
167 static void nf_tables_unregister_hooks(const struct nft_table *table,
168 struct nft_chain *chain,
169 unsigned int hook_nops)
171 if (table->flags & NFT_TABLE_F_DORMANT ||
172 !(chain->flags & NFT_BASE_CHAIN))
175 nft_unregister_basechain(nft_base_chain(chain), hook_nops);
178 /* Internal table flags */
179 #define NFT_TABLE_INACTIVE (1 << 15)
181 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
183 struct nft_trans *trans;
185 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
189 if (msg_type == NFT_MSG_NEWTABLE)
190 ctx->table->flags |= NFT_TABLE_INACTIVE;
192 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
196 static int nft_deltable(struct nft_ctx *ctx)
200 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
204 list_del_rcu(&ctx->table->list);
208 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
210 struct nft_trans *trans;
212 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
216 if (msg_type == NFT_MSG_NEWCHAIN)
217 ctx->chain->flags |= NFT_CHAIN_INACTIVE;
219 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
223 static int nft_delchain(struct nft_ctx *ctx)
227 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
232 list_del_rcu(&ctx->chain->list);
238 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
240 /* You cannot delete the same rule twice */
241 if (nft_is_active_next(ctx->net, rule)) {
242 nft_deactivate_next(ctx->net, rule);
249 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
250 struct nft_rule *rule)
252 struct nft_trans *trans;
254 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
258 nft_trans_rule(trans) = rule;
259 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
264 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
266 struct nft_trans *trans;
269 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
273 err = nf_tables_delrule_deactivate(ctx, rule);
275 nft_trans_destroy(trans);
282 static int nft_delrule_by_chain(struct nft_ctx *ctx)
284 struct nft_rule *rule;
287 list_for_each_entry(rule, &ctx->chain->rules, list) {
288 err = nft_delrule(ctx, rule);
295 /* Internal set flag */
296 #define NFT_SET_INACTIVE (1 << 15)
298 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
301 struct nft_trans *trans;
303 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
307 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
308 nft_trans_set_id(trans) =
309 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
310 set->flags |= NFT_SET_INACTIVE;
312 nft_trans_set(trans) = set;
313 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
318 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
322 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
326 list_del_rcu(&set->list);
336 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
337 const struct nlattr *nla)
339 struct nft_table *table;
341 list_for_each_entry(table, &afi->tables, list) {
342 if (!nla_strcmp(nla, table->name))
348 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
349 const struct nlattr *nla)
351 struct nft_table *table;
354 return ERR_PTR(-EINVAL);
356 table = nft_table_lookup(afi, nla);
360 return ERR_PTR(-ENOENT);
363 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
365 return ++table->hgenerator;
368 static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
370 static const struct nf_chain_type *
371 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
375 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
376 if (chain_type[family][i] != NULL &&
377 !nla_strcmp(nla, chain_type[family][i]->name))
378 return chain_type[family][i];
383 static const struct nf_chain_type *
384 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
385 const struct nlattr *nla,
388 const struct nf_chain_type *type;
390 type = __nf_tables_chain_type_lookup(afi->family, nla);
393 #ifdef CONFIG_MODULES
395 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
396 request_module("nft-chain-%u-%.*s", afi->family,
397 nla_len(nla), (const char *)nla_data(nla));
398 nfnl_lock(NFNL_SUBSYS_NFTABLES);
399 type = __nf_tables_chain_type_lookup(afi->family, nla);
401 return ERR_PTR(-EAGAIN);
404 return ERR_PTR(-ENOENT);
407 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
408 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
409 .len = NFT_TABLE_MAXNAMELEN - 1 },
410 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
413 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
414 u32 portid, u32 seq, int event, u32 flags,
415 int family, const struct nft_table *table)
417 struct nlmsghdr *nlh;
418 struct nfgenmsg *nfmsg;
420 event |= NFNL_SUBSYS_NFTABLES << 8;
421 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
423 goto nla_put_failure;
425 nfmsg = nlmsg_data(nlh);
426 nfmsg->nfgen_family = family;
427 nfmsg->version = NFNETLINK_V0;
428 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
430 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
431 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
432 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
433 goto nla_put_failure;
439 nlmsg_trim(skb, nlh);
443 static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
449 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
453 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
457 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
458 event, 0, ctx->afi->family, ctx->table);
464 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
465 ctx->report, GFP_KERNEL);
468 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
474 static int nf_tables_dump_tables(struct sk_buff *skb,
475 struct netlink_callback *cb)
477 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
478 const struct nft_af_info *afi;
479 const struct nft_table *table;
480 unsigned int idx = 0, s_idx = cb->args[0];
481 struct net *net = sock_net(skb->sk);
482 int family = nfmsg->nfgen_family;
485 cb->seq = net->nft.base_seq;
487 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
488 if (family != NFPROTO_UNSPEC && family != afi->family)
491 list_for_each_entry_rcu(table, &afi->tables, list) {
495 memset(&cb->args[1], 0,
496 sizeof(cb->args) - sizeof(cb->args[0]));
497 if (nf_tables_fill_table_info(skb, net,
498 NETLINK_CB(cb->skb).portid,
502 afi->family, table) < 0)
505 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
516 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
517 struct sk_buff *skb, const struct nlmsghdr *nlh,
518 const struct nlattr * const nla[])
520 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
521 const struct nft_af_info *afi;
522 const struct nft_table *table;
523 struct sk_buff *skb2;
524 int family = nfmsg->nfgen_family;
527 if (nlh->nlmsg_flags & NLM_F_DUMP) {
528 struct netlink_dump_control c = {
529 .dump = nf_tables_dump_tables,
531 return netlink_dump_start(nlsk, skb, nlh, &c);
534 afi = nf_tables_afinfo_lookup(net, family, false);
538 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
540 return PTR_ERR(table);
541 if (table->flags & NFT_TABLE_INACTIVE)
544 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
548 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
549 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
554 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
561 static int nf_tables_table_enable(const struct nft_af_info *afi,
562 struct nft_table *table)
564 struct nft_chain *chain;
567 list_for_each_entry(chain, &table->chains, list) {
568 if (!(chain->flags & NFT_BASE_CHAIN))
571 err = nft_register_basechain(nft_base_chain(chain), afi->nops);
579 list_for_each_entry(chain, &table->chains, list) {
580 if (!(chain->flags & NFT_BASE_CHAIN))
586 nft_unregister_basechain(nft_base_chain(chain), afi->nops);
591 static void nf_tables_table_disable(const struct nft_af_info *afi,
592 struct nft_table *table)
594 struct nft_chain *chain;
596 list_for_each_entry(chain, &table->chains, list) {
597 if (chain->flags & NFT_BASE_CHAIN)
598 nft_unregister_basechain(nft_base_chain(chain),
603 static int nf_tables_updtable(struct nft_ctx *ctx)
605 struct nft_trans *trans;
609 if (!ctx->nla[NFTA_TABLE_FLAGS])
612 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
613 if (flags & ~NFT_TABLE_F_DORMANT)
616 if (flags == ctx->table->flags)
619 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
620 sizeof(struct nft_trans_table));
624 if ((flags & NFT_TABLE_F_DORMANT) &&
625 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
626 nft_trans_table_enable(trans) = false;
627 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
628 ctx->table->flags & NFT_TABLE_F_DORMANT) {
629 ret = nf_tables_table_enable(ctx->afi, ctx->table);
631 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
632 nft_trans_table_enable(trans) = true;
638 nft_trans_table_update(trans) = true;
639 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
642 nft_trans_destroy(trans);
646 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
647 struct sk_buff *skb, const struct nlmsghdr *nlh,
648 const struct nlattr * const nla[])
650 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
651 const struct nlattr *name;
652 struct nft_af_info *afi;
653 struct nft_table *table;
654 int family = nfmsg->nfgen_family;
659 afi = nf_tables_afinfo_lookup(net, family, true);
663 name = nla[NFTA_TABLE_NAME];
664 table = nf_tables_table_lookup(afi, name);
666 if (PTR_ERR(table) != -ENOENT)
667 return PTR_ERR(table);
672 if (table->flags & NFT_TABLE_INACTIVE)
674 if (nlh->nlmsg_flags & NLM_F_EXCL)
676 if (nlh->nlmsg_flags & NLM_F_REPLACE)
679 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
680 return nf_tables_updtable(&ctx);
683 if (nla[NFTA_TABLE_FLAGS]) {
684 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
685 if (flags & ~NFT_TABLE_F_DORMANT)
690 if (!try_module_get(afi->owner))
694 table = kzalloc(sizeof(*table), GFP_KERNEL);
698 nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
699 INIT_LIST_HEAD(&table->chains);
700 INIT_LIST_HEAD(&table->sets);
701 table->flags = flags;
703 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
704 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
708 list_add_tail_rcu(&table->list, &afi->tables);
713 module_put(afi->owner);
718 static int nft_flush_table(struct nft_ctx *ctx)
721 struct nft_chain *chain, *nc;
722 struct nft_set *set, *ns;
724 list_for_each_entry(chain, &ctx->table->chains, list) {
727 err = nft_delrule_by_chain(ctx);
732 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
733 if (set->flags & NFT_SET_ANONYMOUS &&
734 !list_empty(&set->bindings))
737 err = nft_delset(ctx, set);
742 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
745 err = nft_delchain(ctx);
750 err = nft_deltable(ctx);
755 static int nft_flush(struct nft_ctx *ctx, int family)
757 struct nft_af_info *afi;
758 struct nft_table *table, *nt;
759 const struct nlattr * const *nla = ctx->nla;
762 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
763 if (family != AF_UNSPEC && afi->family != family)
767 list_for_each_entry_safe(table, nt, &afi->tables, list) {
768 if (nla[NFTA_TABLE_NAME] &&
769 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
774 err = nft_flush_table(ctx);
783 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
784 struct sk_buff *skb, const struct nlmsghdr *nlh,
785 const struct nlattr * const nla[])
787 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
788 struct nft_af_info *afi;
789 struct nft_table *table;
790 int family = nfmsg->nfgen_family;
793 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
794 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
795 return nft_flush(&ctx, family);
797 afi = nf_tables_afinfo_lookup(net, family, false);
801 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
803 return PTR_ERR(table);
808 return nft_flush_table(&ctx);
811 static void nf_tables_table_destroy(struct nft_ctx *ctx)
813 BUG_ON(ctx->table->use > 0);
816 module_put(ctx->afi->owner);
819 int nft_register_chain_type(const struct nf_chain_type *ctype)
823 nfnl_lock(NFNL_SUBSYS_NFTABLES);
824 if (chain_type[ctype->family][ctype->type] != NULL) {
828 chain_type[ctype->family][ctype->type] = ctype;
830 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
833 EXPORT_SYMBOL_GPL(nft_register_chain_type);
835 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
837 nfnl_lock(NFNL_SUBSYS_NFTABLES);
838 chain_type[ctype->family][ctype->type] = NULL;
839 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
841 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
847 static struct nft_chain *
848 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
850 struct nft_chain *chain;
852 list_for_each_entry(chain, &table->chains, list) {
853 if (chain->handle == handle)
857 return ERR_PTR(-ENOENT);
860 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
861 const struct nlattr *nla)
863 struct nft_chain *chain;
866 return ERR_PTR(-EINVAL);
868 list_for_each_entry(chain, &table->chains, list) {
869 if (!nla_strcmp(nla, chain->name))
873 return ERR_PTR(-ENOENT);
876 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
877 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
878 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
879 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
880 .len = NFT_CHAIN_MAXNAMELEN - 1 },
881 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
882 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
883 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
884 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
887 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
888 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
889 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
890 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
891 .len = IFNAMSIZ - 1 },
894 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
896 struct nft_stats *cpu_stats, total;
902 memset(&total, 0, sizeof(total));
903 for_each_possible_cpu(cpu) {
904 cpu_stats = per_cpu_ptr(stats, cpu);
906 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
907 pkts = cpu_stats->pkts;
908 bytes = cpu_stats->bytes;
909 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
911 total.bytes += bytes;
913 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
915 goto nla_put_failure;
917 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
919 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
921 goto nla_put_failure;
923 nla_nest_end(skb, nest);
930 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
931 u32 portid, u32 seq, int event, u32 flags,
932 int family, const struct nft_table *table,
933 const struct nft_chain *chain)
935 struct nlmsghdr *nlh;
936 struct nfgenmsg *nfmsg;
938 event |= NFNL_SUBSYS_NFTABLES << 8;
939 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
941 goto nla_put_failure;
943 nfmsg = nlmsg_data(nlh);
944 nfmsg->nfgen_family = family;
945 nfmsg->version = NFNETLINK_V0;
946 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
948 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
949 goto nla_put_failure;
950 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
952 goto nla_put_failure;
953 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
954 goto nla_put_failure;
956 if (chain->flags & NFT_BASE_CHAIN) {
957 const struct nft_base_chain *basechain = nft_base_chain(chain);
958 const struct nf_hook_ops *ops = &basechain->ops[0];
961 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
963 goto nla_put_failure;
964 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
965 goto nla_put_failure;
966 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
967 goto nla_put_failure;
968 if (basechain->dev_name[0] &&
969 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
970 goto nla_put_failure;
971 nla_nest_end(skb, nest);
973 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
974 htonl(basechain->policy)))
975 goto nla_put_failure;
977 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
978 goto nla_put_failure;
980 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
981 goto nla_put_failure;
984 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
985 goto nla_put_failure;
991 nlmsg_trim(skb, nlh);
995 static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1001 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1005 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1009 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1010 event, 0, ctx->afi->family, ctx->table,
1017 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1018 ctx->report, GFP_KERNEL);
1021 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1027 static int nf_tables_dump_chains(struct sk_buff *skb,
1028 struct netlink_callback *cb)
1030 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1031 const struct nft_af_info *afi;
1032 const struct nft_table *table;
1033 const struct nft_chain *chain;
1034 unsigned int idx = 0, s_idx = cb->args[0];
1035 struct net *net = sock_net(skb->sk);
1036 int family = nfmsg->nfgen_family;
1039 cb->seq = net->nft.base_seq;
1041 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1042 if (family != NFPROTO_UNSPEC && family != afi->family)
1045 list_for_each_entry_rcu(table, &afi->tables, list) {
1046 list_for_each_entry_rcu(chain, &table->chains, list) {
1050 memset(&cb->args[1], 0,
1051 sizeof(cb->args) - sizeof(cb->args[0]));
1052 if (nf_tables_fill_chain_info(skb, net,
1053 NETLINK_CB(cb->skb).portid,
1057 afi->family, table, chain) < 0)
1060 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1072 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1073 struct sk_buff *skb, const struct nlmsghdr *nlh,
1074 const struct nlattr * const nla[])
1076 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1077 const struct nft_af_info *afi;
1078 const struct nft_table *table;
1079 const struct nft_chain *chain;
1080 struct sk_buff *skb2;
1081 int family = nfmsg->nfgen_family;
1084 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1085 struct netlink_dump_control c = {
1086 .dump = nf_tables_dump_chains,
1088 return netlink_dump_start(nlsk, skb, nlh, &c);
1091 afi = nf_tables_afinfo_lookup(net, family, false);
1093 return PTR_ERR(afi);
1095 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1097 return PTR_ERR(table);
1098 if (table->flags & NFT_TABLE_INACTIVE)
1101 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1103 return PTR_ERR(chain);
1104 if (chain->flags & NFT_CHAIN_INACTIVE)
1107 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1111 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1112 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1113 family, table, chain);
1117 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1124 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1125 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1126 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1129 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1131 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1132 struct nft_stats __percpu *newstats;
1133 struct nft_stats *stats;
1136 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1138 return ERR_PTR(err);
1140 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1141 return ERR_PTR(-EINVAL);
1143 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1144 if (newstats == NULL)
1145 return ERR_PTR(-ENOMEM);
1147 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1148 * are not exposed to userspace.
1151 stats = this_cpu_ptr(newstats);
1152 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1153 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1159 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1160 struct nft_stats __percpu *newstats)
1162 if (newstats == NULL)
1166 struct nft_stats __percpu *oldstats =
1167 nft_dereference(chain->stats);
1169 rcu_assign_pointer(chain->stats, newstats);
1171 free_percpu(oldstats);
1173 rcu_assign_pointer(chain->stats, newstats);
1176 static void nf_tables_chain_destroy(struct nft_chain *chain)
1178 BUG_ON(chain->use > 0);
1180 if (chain->flags & NFT_BASE_CHAIN) {
1181 struct nft_base_chain *basechain = nft_base_chain(chain);
1183 module_put(basechain->type->owner);
1184 free_percpu(basechain->stats);
1185 if (basechain->ops[0].dev != NULL)
1186 dev_put(basechain->ops[0].dev);
1193 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1194 struct sk_buff *skb, const struct nlmsghdr *nlh,
1195 const struct nlattr * const nla[])
1197 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1198 const struct nlattr * uninitialized_var(name);
1199 struct nft_af_info *afi;
1200 struct nft_table *table;
1201 struct nft_chain *chain;
1202 struct nft_base_chain *basechain = NULL;
1203 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1204 int family = nfmsg->nfgen_family;
1205 struct net_device *dev = NULL;
1206 u8 policy = NF_ACCEPT;
1209 struct nft_stats __percpu *stats;
1214 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1216 afi = nf_tables_afinfo_lookup(net, family, true);
1218 return PTR_ERR(afi);
1220 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1222 return PTR_ERR(table);
1225 name = nla[NFTA_CHAIN_NAME];
1227 if (nla[NFTA_CHAIN_HANDLE]) {
1228 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1229 chain = nf_tables_chain_lookup_byhandle(table, handle);
1231 return PTR_ERR(chain);
1233 chain = nf_tables_chain_lookup(table, name);
1234 if (IS_ERR(chain)) {
1235 if (PTR_ERR(chain) != -ENOENT)
1236 return PTR_ERR(chain);
1241 if (nla[NFTA_CHAIN_POLICY]) {
1242 if ((chain != NULL &&
1243 !(chain->flags & NFT_BASE_CHAIN)))
1246 if (chain == NULL &&
1247 nla[NFTA_CHAIN_HOOK] == NULL)
1250 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1260 if (chain != NULL) {
1261 struct nft_stats *stats = NULL;
1262 struct nft_trans *trans;
1264 if (chain->flags & NFT_CHAIN_INACTIVE)
1266 if (nlh->nlmsg_flags & NLM_F_EXCL)
1268 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1271 if (nla[NFTA_CHAIN_HANDLE] && name &&
1272 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
1275 if (nla[NFTA_CHAIN_COUNTERS]) {
1276 if (!(chain->flags & NFT_BASE_CHAIN))
1279 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1281 return PTR_ERR(stats);
1284 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1285 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1286 sizeof(struct nft_trans_chain));
1287 if (trans == NULL) {
1292 nft_trans_chain_stats(trans) = stats;
1293 nft_trans_chain_update(trans) = true;
1295 if (nla[NFTA_CHAIN_POLICY])
1296 nft_trans_chain_policy(trans) = policy;
1298 nft_trans_chain_policy(trans) = -1;
1300 if (nla[NFTA_CHAIN_HANDLE] && name) {
1301 nla_strlcpy(nft_trans_chain_name(trans), name,
1302 NFT_CHAIN_MAXNAMELEN);
1304 list_add_tail(&trans->list, &net->nft.commit_list);
1308 if (table->use == UINT_MAX)
1311 if (nla[NFTA_CHAIN_HOOK]) {
1312 const struct nf_chain_type *type;
1313 struct nf_hook_ops *ops;
1315 u32 hooknum, priority;
1317 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1318 if (nla[NFTA_CHAIN_TYPE]) {
1319 type = nf_tables_chain_type_lookup(afi,
1320 nla[NFTA_CHAIN_TYPE],
1323 return PTR_ERR(type);
1326 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1330 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1331 ha[NFTA_HOOK_PRIORITY] == NULL)
1334 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1335 if (hooknum >= afi->nhooks)
1337 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1339 if (!(type->hook_mask & (1 << hooknum)))
1341 if (!try_module_get(type->owner))
1343 hookfn = type->hooks[hooknum];
1345 if (afi->flags & NFT_AF_NEEDS_DEV) {
1346 char ifname[IFNAMSIZ];
1348 if (!ha[NFTA_HOOK_DEV]) {
1349 module_put(type->owner);
1353 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1354 dev = dev_get_by_name(net, ifname);
1356 module_put(type->owner);
1359 } else if (ha[NFTA_HOOK_DEV]) {
1360 module_put(type->owner);
1364 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1365 if (basechain == NULL) {
1366 module_put(type->owner);
1373 strncpy(basechain->dev_name, dev->name, IFNAMSIZ);
1375 if (nla[NFTA_CHAIN_COUNTERS]) {
1376 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1377 if (IS_ERR(stats)) {
1378 module_put(type->owner);
1382 return PTR_ERR(stats);
1384 basechain->stats = stats;
1386 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1387 if (stats == NULL) {
1388 module_put(type->owner);
1394 rcu_assign_pointer(basechain->stats, stats);
1397 write_pnet(&basechain->pnet, net);
1398 basechain->type = type;
1399 chain = &basechain->chain;
1401 for (i = 0; i < afi->nops; i++) {
1402 ops = &basechain->ops[i];
1404 ops->hooknum = hooknum;
1405 ops->priority = priority;
1407 ops->hook = afi->hooks[ops->hooknum];
1411 if (afi->hook_ops_init)
1412 afi->hook_ops_init(ops, i);
1415 chain->flags |= NFT_BASE_CHAIN;
1416 basechain->policy = policy;
1418 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1423 INIT_LIST_HEAD(&chain->rules);
1424 chain->handle = nf_tables_alloc_handle(table);
1425 chain->table = table;
1426 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1428 err = nf_tables_register_hooks(table, chain, afi->nops);
1432 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1433 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1438 list_add_tail_rcu(&chain->list, &table->chains);
1441 nf_tables_unregister_hooks(table, chain, afi->nops);
1443 nf_tables_chain_destroy(chain);
1447 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1448 struct sk_buff *skb, const struct nlmsghdr *nlh,
1449 const struct nlattr * const nla[])
1451 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1452 struct nft_af_info *afi;
1453 struct nft_table *table;
1454 struct nft_chain *chain;
1455 int family = nfmsg->nfgen_family;
1458 afi = nf_tables_afinfo_lookup(net, family, false);
1460 return PTR_ERR(afi);
1462 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1464 return PTR_ERR(table);
1466 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1468 return PTR_ERR(chain);
1472 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1474 return nft_delchain(&ctx);
1482 * nft_register_expr - register nf_tables expr type
1485 * Registers the expr type for use with nf_tables. Returns zero on
1486 * success or a negative errno code otherwise.
1488 int nft_register_expr(struct nft_expr_type *type)
1490 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1491 if (type->family == NFPROTO_UNSPEC)
1492 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1494 list_add_rcu(&type->list, &nf_tables_expressions);
1495 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1498 EXPORT_SYMBOL_GPL(nft_register_expr);
1501 * nft_unregister_expr - unregister nf_tables expr type
1504 * Unregisters the expr typefor use with nf_tables.
1506 void nft_unregister_expr(struct nft_expr_type *type)
1508 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1509 list_del_rcu(&type->list);
1510 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1512 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1514 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1517 const struct nft_expr_type *type;
1519 list_for_each_entry(type, &nf_tables_expressions, list) {
1520 if (!nla_strcmp(nla, type->name) &&
1521 (!type->family || type->family == family))
1527 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1530 const struct nft_expr_type *type;
1533 return ERR_PTR(-EINVAL);
1535 type = __nft_expr_type_get(family, nla);
1536 if (type != NULL && try_module_get(type->owner))
1539 #ifdef CONFIG_MODULES
1541 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1542 request_module("nft-expr-%u-%.*s", family,
1543 nla_len(nla), (char *)nla_data(nla));
1544 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1545 if (__nft_expr_type_get(family, nla))
1546 return ERR_PTR(-EAGAIN);
1548 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1549 request_module("nft-expr-%.*s",
1550 nla_len(nla), (char *)nla_data(nla));
1551 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1552 if (__nft_expr_type_get(family, nla))
1553 return ERR_PTR(-EAGAIN);
1556 return ERR_PTR(-ENOENT);
1559 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1560 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1561 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1564 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1565 const struct nft_expr *expr)
1567 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1568 goto nla_put_failure;
1570 if (expr->ops->dump) {
1571 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1573 goto nla_put_failure;
1574 if (expr->ops->dump(skb, expr) < 0)
1575 goto nla_put_failure;
1576 nla_nest_end(skb, data);
1585 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1586 const struct nft_expr *expr)
1588 struct nlattr *nest;
1590 nest = nla_nest_start(skb, attr);
1592 goto nla_put_failure;
1593 if (nf_tables_fill_expr_info(skb, expr) < 0)
1594 goto nla_put_failure;
1595 nla_nest_end(skb, nest);
1602 struct nft_expr_info {
1603 const struct nft_expr_ops *ops;
1604 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1607 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1608 const struct nlattr *nla,
1609 struct nft_expr_info *info)
1611 const struct nft_expr_type *type;
1612 const struct nft_expr_ops *ops;
1613 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1616 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1620 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1622 return PTR_ERR(type);
1624 if (tb[NFTA_EXPR_DATA]) {
1625 err = nla_parse_nested(info->tb, type->maxattr,
1626 tb[NFTA_EXPR_DATA], type->policy);
1630 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1632 if (type->select_ops != NULL) {
1633 ops = type->select_ops(ctx,
1634 (const struct nlattr * const *)info->tb);
1646 module_put(type->owner);
1650 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1651 const struct nft_expr_info *info,
1652 struct nft_expr *expr)
1654 const struct nft_expr_ops *ops = info->ops;
1659 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1671 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1672 struct nft_expr *expr)
1674 if (expr->ops->destroy)
1675 expr->ops->destroy(ctx, expr);
1676 module_put(expr->ops->type->owner);
1679 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1680 const struct nlattr *nla)
1682 struct nft_expr_info info;
1683 struct nft_expr *expr;
1686 err = nf_tables_expr_parse(ctx, nla, &info);
1691 expr = kzalloc(info.ops->size, GFP_KERNEL);
1695 err = nf_tables_newexpr(ctx, &info, expr);
1701 module_put(info.ops->type->owner);
1703 return ERR_PTR(err);
1706 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1708 nf_tables_expr_destroy(ctx, expr);
1716 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1719 struct nft_rule *rule;
1721 // FIXME: this sucks
1722 list_for_each_entry(rule, &chain->rules, list) {
1723 if (handle == rule->handle)
1727 return ERR_PTR(-ENOENT);
1730 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1731 const struct nlattr *nla)
1734 return ERR_PTR(-EINVAL);
1736 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1739 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1740 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1741 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1742 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1743 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1744 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1745 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1746 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1747 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1748 .len = NFT_USERDATA_MAXLEN },
1751 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1752 u32 portid, u32 seq, int event,
1753 u32 flags, int family,
1754 const struct nft_table *table,
1755 const struct nft_chain *chain,
1756 const struct nft_rule *rule)
1758 struct nlmsghdr *nlh;
1759 struct nfgenmsg *nfmsg;
1760 const struct nft_expr *expr, *next;
1761 struct nlattr *list;
1762 const struct nft_rule *prule;
1763 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1765 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1768 goto nla_put_failure;
1770 nfmsg = nlmsg_data(nlh);
1771 nfmsg->nfgen_family = family;
1772 nfmsg->version = NFNETLINK_V0;
1773 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1775 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1776 goto nla_put_failure;
1777 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1778 goto nla_put_failure;
1779 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1781 goto nla_put_failure;
1783 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1784 prule = list_entry(rule->list.prev, struct nft_rule, list);
1785 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1786 cpu_to_be64(prule->handle),
1788 goto nla_put_failure;
1791 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1793 goto nla_put_failure;
1794 nft_rule_for_each_expr(expr, next, rule) {
1795 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
1796 goto nla_put_failure;
1798 nla_nest_end(skb, list);
1801 struct nft_userdata *udata = nft_userdata(rule);
1802 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1804 goto nla_put_failure;
1807 nlmsg_end(skb, nlh);
1811 nlmsg_trim(skb, nlh);
1815 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1816 const struct nft_rule *rule,
1819 struct sk_buff *skb;
1823 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1827 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1831 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1832 event, 0, ctx->afi->family, ctx->table,
1839 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1840 ctx->report, GFP_KERNEL);
1843 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1849 static int nf_tables_dump_rules(struct sk_buff *skb,
1850 struct netlink_callback *cb)
1852 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1853 const struct nft_af_info *afi;
1854 const struct nft_table *table;
1855 const struct nft_chain *chain;
1856 const struct nft_rule *rule;
1857 unsigned int idx = 0, s_idx = cb->args[0];
1858 struct net *net = sock_net(skb->sk);
1859 int family = nfmsg->nfgen_family;
1862 cb->seq = net->nft.base_seq;
1864 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1865 if (family != NFPROTO_UNSPEC && family != afi->family)
1868 list_for_each_entry_rcu(table, &afi->tables, list) {
1869 list_for_each_entry_rcu(chain, &table->chains, list) {
1870 list_for_each_entry_rcu(rule, &chain->rules, list) {
1871 if (!nft_is_active(net, rule))
1876 memset(&cb->args[1], 0,
1877 sizeof(cb->args) - sizeof(cb->args[0]));
1878 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
1881 NLM_F_MULTI | NLM_F_APPEND,
1882 afi->family, table, chain, rule) < 0)
1885 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1899 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
1900 struct sk_buff *skb, const struct nlmsghdr *nlh,
1901 const struct nlattr * const nla[])
1903 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1904 const struct nft_af_info *afi;
1905 const struct nft_table *table;
1906 const struct nft_chain *chain;
1907 const struct nft_rule *rule;
1908 struct sk_buff *skb2;
1909 int family = nfmsg->nfgen_family;
1912 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1913 struct netlink_dump_control c = {
1914 .dump = nf_tables_dump_rules,
1916 return netlink_dump_start(nlsk, skb, nlh, &c);
1919 afi = nf_tables_afinfo_lookup(net, family, false);
1921 return PTR_ERR(afi);
1923 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1925 return PTR_ERR(table);
1926 if (table->flags & NFT_TABLE_INACTIVE)
1929 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1931 return PTR_ERR(chain);
1932 if (chain->flags & NFT_CHAIN_INACTIVE)
1935 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1937 return PTR_ERR(rule);
1939 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1943 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
1944 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1945 family, table, chain, rule);
1949 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1956 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1957 struct nft_rule *rule)
1959 struct nft_expr *expr;
1962 * Careful: some expressions might not be initialized in case this
1963 * is called on error from nf_tables_newrule().
1965 expr = nft_expr_first(rule);
1966 while (expr->ops && expr != nft_expr_last(rule)) {
1967 nf_tables_expr_destroy(ctx, expr);
1968 expr = nft_expr_next(expr);
1973 #define NFT_RULE_MAXEXPRS 128
1975 static struct nft_expr_info *info;
1977 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
1978 struct sk_buff *skb, const struct nlmsghdr *nlh,
1979 const struct nlattr * const nla[])
1981 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1982 struct nft_af_info *afi;
1983 struct nft_table *table;
1984 struct nft_chain *chain;
1985 struct nft_rule *rule, *old_rule = NULL;
1986 struct nft_userdata *udata;
1987 struct nft_trans *trans = NULL;
1988 struct nft_expr *expr;
1991 unsigned int size, i, n, ulen = 0, usize = 0;
1994 u64 handle, pos_handle;
1996 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1998 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2000 return PTR_ERR(afi);
2002 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
2004 return PTR_ERR(table);
2006 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2008 return PTR_ERR(chain);
2010 if (nla[NFTA_RULE_HANDLE]) {
2011 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2012 rule = __nf_tables_rule_lookup(chain, handle);
2014 return PTR_ERR(rule);
2016 if (nlh->nlmsg_flags & NLM_F_EXCL)
2018 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2023 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2025 handle = nf_tables_alloc_handle(table);
2027 if (chain->use == UINT_MAX)
2031 if (nla[NFTA_RULE_POSITION]) {
2032 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2035 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2036 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2037 if (IS_ERR(old_rule))
2038 return PTR_ERR(old_rule);
2041 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2045 if (nla[NFTA_RULE_EXPRESSIONS]) {
2046 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2048 if (nla_type(tmp) != NFTA_LIST_ELEM)
2050 if (n == NFT_RULE_MAXEXPRS)
2052 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2055 size += info[n].ops->size;
2059 /* Check for overflow of dlen field */
2061 if (size >= 1 << 12)
2064 if (nla[NFTA_RULE_USERDATA]) {
2065 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2067 usize = sizeof(struct nft_userdata) + ulen;
2071 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2075 nft_activate_next(net, rule);
2077 rule->handle = handle;
2079 rule->udata = ulen ? 1 : 0;
2082 udata = nft_userdata(rule);
2083 udata->len = ulen - 1;
2084 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2087 expr = nft_expr_first(rule);
2088 for (i = 0; i < n; i++) {
2089 err = nf_tables_newexpr(&ctx, &info[i], expr);
2093 expr = nft_expr_next(expr);
2096 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2097 if (nft_is_active_next(net, old_rule)) {
2098 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2100 if (trans == NULL) {
2104 nft_deactivate_next(net, old_rule);
2106 list_add_tail_rcu(&rule->list, &old_rule->list);
2111 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2113 list_add_rcu(&rule->list, &old_rule->list);
2115 list_add_tail_rcu(&rule->list, &chain->rules);
2118 list_add_tail_rcu(&rule->list, &old_rule->list);
2120 list_add_rcu(&rule->list, &chain->rules);
2123 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2131 list_del_rcu(&rule->list);
2133 nf_tables_rule_destroy(&ctx, rule);
2135 for (i = 0; i < n; i++) {
2136 if (info[i].ops != NULL)
2137 module_put(info[i].ops->type->owner);
2142 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2143 struct sk_buff *skb, const struct nlmsghdr *nlh,
2144 const struct nlattr * const nla[])
2146 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2147 struct nft_af_info *afi;
2148 struct nft_table *table;
2149 struct nft_chain *chain = NULL;
2150 struct nft_rule *rule;
2151 int family = nfmsg->nfgen_family, err = 0;
2154 afi = nf_tables_afinfo_lookup(net, family, false);
2156 return PTR_ERR(afi);
2158 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
2160 return PTR_ERR(table);
2162 if (nla[NFTA_RULE_CHAIN]) {
2163 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2165 return PTR_ERR(chain);
2168 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2171 if (nla[NFTA_RULE_HANDLE]) {
2172 rule = nf_tables_rule_lookup(chain,
2173 nla[NFTA_RULE_HANDLE]);
2175 return PTR_ERR(rule);
2177 err = nft_delrule(&ctx, rule);
2179 err = nft_delrule_by_chain(&ctx);
2182 list_for_each_entry(chain, &table->chains, list) {
2184 err = nft_delrule_by_chain(&ctx);
2197 static LIST_HEAD(nf_tables_set_ops);
2199 int nft_register_set(struct nft_set_ops *ops)
2201 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2202 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2203 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2206 EXPORT_SYMBOL_GPL(nft_register_set);
2208 void nft_unregister_set(struct nft_set_ops *ops)
2210 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2211 list_del_rcu(&ops->list);
2212 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2214 EXPORT_SYMBOL_GPL(nft_unregister_set);
2217 * Select a set implementation based on the data characteristics and the
2218 * given policy. The total memory use might not be known if no size is
2219 * given, in that case the amount of memory per element is used.
2221 static const struct nft_set_ops *
2222 nft_select_set_ops(const struct nlattr * const nla[],
2223 const struct nft_set_desc *desc,
2224 enum nft_set_policies policy)
2226 const struct nft_set_ops *ops, *bops;
2227 struct nft_set_estimate est, best;
2230 #ifdef CONFIG_MODULES
2231 if (list_empty(&nf_tables_set_ops)) {
2232 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2233 request_module("nft-set");
2234 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2235 if (!list_empty(&nf_tables_set_ops))
2236 return ERR_PTR(-EAGAIN);
2240 if (nla[NFTA_SET_FLAGS] != NULL) {
2241 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2242 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT;
2249 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2250 if ((ops->features & features) != features)
2252 if (!ops->estimate(desc, features, &est))
2256 case NFT_SET_POL_PERFORMANCE:
2257 if (est.class < best.class)
2259 if (est.class == best.class && est.size < best.size)
2262 case NFT_SET_POL_MEMORY:
2263 if (est.size < best.size)
2265 if (est.size == best.size && est.class < best.class)
2272 if (!try_module_get(ops->owner))
2275 module_put(bops->owner);
2284 return ERR_PTR(-EOPNOTSUPP);
2287 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2288 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2289 [NFTA_SET_NAME] = { .type = NLA_STRING,
2290 .len = NFT_SET_MAXNAMELEN - 1 },
2291 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2292 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2293 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2294 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2295 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2296 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2297 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2298 [NFTA_SET_ID] = { .type = NLA_U32 },
2299 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2300 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2301 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2302 .len = NFT_USERDATA_MAXLEN },
2305 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2306 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2309 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2310 const struct sk_buff *skb,
2311 const struct nlmsghdr *nlh,
2312 const struct nlattr * const nla[])
2314 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2315 struct nft_af_info *afi = NULL;
2316 struct nft_table *table = NULL;
2318 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2319 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2321 return PTR_ERR(afi);
2324 if (nla[NFTA_SET_TABLE] != NULL) {
2326 return -EAFNOSUPPORT;
2328 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2330 return PTR_ERR(table);
2333 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
2337 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2338 const struct nlattr *nla)
2340 struct nft_set *set;
2343 return ERR_PTR(-EINVAL);
2345 list_for_each_entry(set, &table->sets, list) {
2346 if (!nla_strcmp(nla, set->name))
2349 return ERR_PTR(-ENOENT);
2352 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2353 const struct nlattr *nla)
2355 struct nft_trans *trans;
2356 u32 id = ntohl(nla_get_be32(nla));
2358 list_for_each_entry(trans, &net->nft.commit_list, list) {
2359 if (trans->msg_type == NFT_MSG_NEWSET &&
2360 id == nft_trans_set_id(trans))
2361 return nft_trans_set(trans);
2363 return ERR_PTR(-ENOENT);
2366 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2369 const struct nft_set *i;
2371 unsigned long *inuse;
2372 unsigned int n = 0, min = 0;
2374 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
2376 if (p[1] != 'd' || strchr(p + 2, '%'))
2379 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2383 list_for_each_entry(i, &ctx->table->sets, list) {
2386 if (!sscanf(i->name, name, &tmp))
2388 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2391 set_bit(tmp - min, inuse);
2394 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2395 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2396 min += BITS_PER_BYTE * PAGE_SIZE;
2397 memset(inuse, 0, PAGE_SIZE);
2400 free_page((unsigned long)inuse);
2403 snprintf(set->name, sizeof(set->name), name, min + n);
2404 list_for_each_entry(i, &ctx->table->sets, list) {
2405 if (!strcmp(set->name, i->name))
2411 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2412 const struct nft_set *set, u16 event, u16 flags)
2414 struct nfgenmsg *nfmsg;
2415 struct nlmsghdr *nlh;
2416 struct nlattr *desc;
2417 u32 portid = ctx->portid;
2420 event |= NFNL_SUBSYS_NFTABLES << 8;
2421 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2424 goto nla_put_failure;
2426 nfmsg = nlmsg_data(nlh);
2427 nfmsg->nfgen_family = ctx->afi->family;
2428 nfmsg->version = NFNETLINK_V0;
2429 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2431 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2432 goto nla_put_failure;
2433 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2434 goto nla_put_failure;
2435 if (set->flags != 0)
2436 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2437 goto nla_put_failure;
2439 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2440 goto nla_put_failure;
2441 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2442 goto nla_put_failure;
2443 if (set->flags & NFT_SET_MAP) {
2444 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2445 goto nla_put_failure;
2446 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2447 goto nla_put_failure;
2451 nla_put_be64(skb, NFTA_SET_TIMEOUT, cpu_to_be64(set->timeout),
2453 goto nla_put_failure;
2455 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2456 goto nla_put_failure;
2458 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2459 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2460 goto nla_put_failure;
2463 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2464 goto nla_put_failure;
2466 desc = nla_nest_start(skb, NFTA_SET_DESC);
2468 goto nla_put_failure;
2470 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2471 goto nla_put_failure;
2472 nla_nest_end(skb, desc);
2474 nlmsg_end(skb, nlh);
2478 nlmsg_trim(skb, nlh);
2482 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2483 const struct nft_set *set,
2484 int event, gfp_t gfp_flags)
2486 struct sk_buff *skb;
2487 u32 portid = ctx->portid;
2491 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2495 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2499 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2505 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2506 ctx->report, gfp_flags);
2509 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2513 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2515 const struct nft_set *set;
2516 unsigned int idx, s_idx = cb->args[0];
2517 struct nft_af_info *afi;
2518 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2519 struct net *net = sock_net(skb->sk);
2520 int cur_family = cb->args[3];
2521 struct nft_ctx *ctx = cb->data, ctx_set;
2527 cb->seq = net->nft.base_seq;
2529 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2530 if (ctx->afi && ctx->afi != afi)
2534 if (afi->family != cur_family)
2539 list_for_each_entry_rcu(table, &afi->tables, list) {
2540 if (ctx->table && ctx->table != table)
2544 if (cur_table != table)
2550 list_for_each_entry_rcu(set, &table->sets, list) {
2555 ctx_set.table = table;
2557 if (nf_tables_fill_set(skb, &ctx_set, set,
2561 cb->args[2] = (unsigned long) table;
2562 cb->args[3] = afi->family;
2565 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2579 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2585 static int nf_tables_getset(struct net *net, struct sock *nlsk,
2586 struct sk_buff *skb, const struct nlmsghdr *nlh,
2587 const struct nlattr * const nla[])
2589 const struct nft_set *set;
2591 struct sk_buff *skb2;
2592 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2595 /* Verify existence before starting dump */
2596 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla);
2600 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2601 struct netlink_dump_control c = {
2602 .dump = nf_tables_dump_sets,
2603 .done = nf_tables_dump_sets_done,
2605 struct nft_ctx *ctx_dump;
2607 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2608 if (ctx_dump == NULL)
2614 return netlink_dump_start(nlsk, skb, nlh, &c);
2617 /* Only accept unspec with dump */
2618 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2619 return -EAFNOSUPPORT;
2621 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2623 return PTR_ERR(set);
2624 if (set->flags & NFT_SET_INACTIVE)
2627 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2631 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2635 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2642 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2643 struct nft_set_desc *desc,
2644 const struct nlattr *nla)
2646 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2649 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2653 if (da[NFTA_SET_DESC_SIZE] != NULL)
2654 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2659 static int nf_tables_newset(struct net *net, struct sock *nlsk,
2660 struct sk_buff *skb, const struct nlmsghdr *nlh,
2661 const struct nlattr * const nla[])
2663 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2664 const struct nft_set_ops *ops;
2665 struct nft_af_info *afi;
2666 struct nft_table *table;
2667 struct nft_set *set;
2669 char name[NFT_SET_MAXNAMELEN];
2673 u32 ktype, dtype, flags, policy, gc_int;
2674 struct nft_set_desc desc;
2675 unsigned char *udata;
2679 if (nla[NFTA_SET_TABLE] == NULL ||
2680 nla[NFTA_SET_NAME] == NULL ||
2681 nla[NFTA_SET_KEY_LEN] == NULL ||
2682 nla[NFTA_SET_ID] == NULL)
2685 memset(&desc, 0, sizeof(desc));
2687 ktype = NFT_DATA_VALUE;
2688 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2689 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2690 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2694 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2695 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
2699 if (nla[NFTA_SET_FLAGS] != NULL) {
2700 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2701 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2702 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2703 NFT_SET_MAP | NFT_SET_EVAL))
2705 /* Only one of both operations is supported */
2706 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL)) ==
2707 (NFT_SET_MAP | NFT_SET_EVAL))
2712 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2713 if (!(flags & NFT_SET_MAP))
2716 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2717 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2718 dtype != NFT_DATA_VERDICT)
2721 if (dtype != NFT_DATA_VERDICT) {
2722 if (nla[NFTA_SET_DATA_LEN] == NULL)
2724 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2725 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
2728 desc.dlen = sizeof(struct nft_verdict);
2729 } else if (flags & NFT_SET_MAP)
2733 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2734 if (!(flags & NFT_SET_TIMEOUT))
2736 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_TIMEOUT]));
2739 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2740 if (!(flags & NFT_SET_TIMEOUT))
2742 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2745 policy = NFT_SET_POL_PERFORMANCE;
2746 if (nla[NFTA_SET_POLICY] != NULL)
2747 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2749 if (nla[NFTA_SET_DESC] != NULL) {
2750 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2755 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2757 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2759 return PTR_ERR(afi);
2761 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2763 return PTR_ERR(table);
2765 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
2767 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2769 if (PTR_ERR(set) != -ENOENT)
2770 return PTR_ERR(set);
2775 if (nlh->nlmsg_flags & NLM_F_EXCL)
2777 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2782 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2785 ops = nft_select_set_ops(nla, &desc, policy);
2787 return PTR_ERR(ops);
2790 if (nla[NFTA_SET_USERDATA])
2791 udlen = nla_len(nla[NFTA_SET_USERDATA]);
2794 if (ops->privsize != NULL)
2795 size = ops->privsize(nla);
2798 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
2802 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2803 err = nf_tables_set_alloc_name(&ctx, set, name);
2809 udata = set->data + size;
2810 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
2813 INIT_LIST_HEAD(&set->bindings);
2814 write_pnet(&set->pnet, net);
2817 set->klen = desc.klen;
2819 set->dlen = desc.dlen;
2821 set->size = desc.size;
2822 set->policy = policy;
2825 set->timeout = timeout;
2826 set->gc_int = gc_int;
2828 err = ops->init(set, &desc, nla);
2832 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2836 list_add_tail_rcu(&set->list, &table->sets);
2843 module_put(ops->owner);
2847 static void nft_set_destroy(struct nft_set *set)
2849 set->ops->destroy(set);
2850 module_put(set->ops->owner);
2854 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2856 list_del_rcu(&set->list);
2857 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
2858 nft_set_destroy(set);
2861 static int nf_tables_delset(struct net *net, struct sock *nlsk,
2862 struct sk_buff *skb, const struct nlmsghdr *nlh,
2863 const struct nlattr * const nla[])
2865 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2866 struct nft_set *set;
2870 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2871 return -EAFNOSUPPORT;
2872 if (nla[NFTA_SET_TABLE] == NULL)
2875 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla);
2879 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2881 return PTR_ERR(set);
2882 if (!list_empty(&set->bindings))
2885 return nft_delset(&ctx, set);
2888 static int nf_tables_bind_check_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 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
2894 enum nft_registers dreg;
2896 dreg = nft_type_to_reg(set->dtype);
2897 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
2898 set->dtype == NFT_DATA_VERDICT ?
2899 NFT_DATA_VERDICT : NFT_DATA_VALUE,
2903 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2904 struct nft_set_binding *binding)
2906 struct nft_set_binding *i;
2907 struct nft_set_iter iter;
2909 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2912 if (binding->flags & NFT_SET_MAP) {
2913 /* If the set is already bound to the same chain all
2914 * jumps are already validated for that chain.
2916 list_for_each_entry(i, &set->bindings, list) {
2917 if (binding->flags & NFT_SET_MAP &&
2918 i->chain == binding->chain)
2925 iter.fn = nf_tables_bind_check_setelem;
2927 set->ops->walk(ctx, set, &iter);
2929 /* Destroy anonymous sets if binding fails */
2930 if (set->flags & NFT_SET_ANONYMOUS)
2931 nf_tables_set_destroy(ctx, set);
2937 binding->chain = ctx->chain;
2938 list_add_tail_rcu(&binding->list, &set->bindings);
2942 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2943 struct nft_set_binding *binding)
2945 list_del_rcu(&binding->list);
2947 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2948 !(set->flags & NFT_SET_INACTIVE))
2949 nf_tables_set_destroy(ctx, set);
2952 const struct nft_set_ext_type nft_set_ext_types[] = {
2953 [NFT_SET_EXT_KEY] = {
2954 .align = __alignof__(u32),
2956 [NFT_SET_EXT_DATA] = {
2957 .align = __alignof__(u32),
2959 [NFT_SET_EXT_EXPR] = {
2960 .align = __alignof__(struct nft_expr),
2962 [NFT_SET_EXT_FLAGS] = {
2964 .align = __alignof__(u8),
2966 [NFT_SET_EXT_TIMEOUT] = {
2968 .align = __alignof__(u64),
2970 [NFT_SET_EXT_EXPIRATION] = {
2971 .len = sizeof(unsigned long),
2972 .align = __alignof__(unsigned long),
2974 [NFT_SET_EXT_USERDATA] = {
2975 .len = sizeof(struct nft_userdata),
2976 .align = __alignof__(struct nft_userdata),
2979 EXPORT_SYMBOL_GPL(nft_set_ext_types);
2985 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
2986 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
2987 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
2988 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
2989 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
2990 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
2991 .len = NFT_USERDATA_MAXLEN },
2994 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
2995 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
2996 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
2997 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
2998 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3001 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3002 const struct sk_buff *skb,
3003 const struct nlmsghdr *nlh,
3004 const struct nlattr * const nla[])
3006 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3007 struct nft_af_info *afi;
3008 struct nft_table *table;
3010 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3012 return PTR_ERR(afi);
3014 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
3016 return PTR_ERR(table);
3018 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
3022 static int nf_tables_fill_setelem(struct sk_buff *skb,
3023 const struct nft_set *set,
3024 const struct nft_set_elem *elem)
3026 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3027 unsigned char *b = skb_tail_pointer(skb);
3028 struct nlattr *nest;
3030 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3032 goto nla_put_failure;
3034 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3035 NFT_DATA_VALUE, set->klen) < 0)
3036 goto nla_put_failure;
3038 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3039 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3040 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3042 goto nla_put_failure;
3044 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3045 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3046 goto nla_put_failure;
3048 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3049 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3050 htonl(*nft_set_ext_flags(ext))))
3051 goto nla_put_failure;
3053 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3054 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3055 cpu_to_be64(*nft_set_ext_timeout(ext)),
3057 goto nla_put_failure;
3059 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3060 unsigned long expires, now = jiffies;
3062 expires = *nft_set_ext_expiration(ext);
3063 if (time_before(now, expires))
3068 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3069 cpu_to_be64(jiffies_to_msecs(expires)),
3071 goto nla_put_failure;
3074 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3075 struct nft_userdata *udata;
3077 udata = nft_set_ext_userdata(ext);
3078 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3079 udata->len + 1, udata->data))
3080 goto nla_put_failure;
3083 nla_nest_end(skb, nest);
3091 struct nft_set_dump_args {
3092 const struct netlink_callback *cb;
3093 struct nft_set_iter iter;
3094 struct sk_buff *skb;
3097 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3098 const struct nft_set *set,
3099 const struct nft_set_iter *iter,
3100 const struct nft_set_elem *elem)
3102 struct nft_set_dump_args *args;
3104 args = container_of(iter, struct nft_set_dump_args, iter);
3105 return nf_tables_fill_setelem(args->skb, set, elem);
3108 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3110 struct net *net = sock_net(skb->sk);
3111 const struct nft_set *set;
3112 struct nft_set_dump_args args;
3114 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3115 struct nfgenmsg *nfmsg;
3116 struct nlmsghdr *nlh;
3117 struct nlattr *nest;
3121 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3122 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
3126 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
3130 if (ctx.table->flags & NFT_TABLE_INACTIVE)
3133 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3135 return PTR_ERR(set);
3136 if (set->flags & NFT_SET_INACTIVE)
3139 event = NFT_MSG_NEWSETELEM;
3140 event |= NFNL_SUBSYS_NFTABLES << 8;
3141 portid = NETLINK_CB(cb->skb).portid;
3142 seq = cb->nlh->nlmsg_seq;
3144 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3147 goto nla_put_failure;
3149 nfmsg = nlmsg_data(nlh);
3150 nfmsg->nfgen_family = ctx.afi->family;
3151 nfmsg->version = NFNETLINK_V0;
3152 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
3154 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3155 goto nla_put_failure;
3156 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3157 goto nla_put_failure;
3159 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3161 goto nla_put_failure;
3165 args.iter.skip = cb->args[0];
3166 args.iter.count = 0;
3168 args.iter.fn = nf_tables_dump_setelem;
3169 set->ops->walk(&ctx, set, &args.iter);
3171 nla_nest_end(skb, nest);
3172 nlmsg_end(skb, nlh);
3174 if (args.iter.err && args.iter.err != -EMSGSIZE)
3175 return args.iter.err;
3176 if (args.iter.count == cb->args[0])
3179 cb->args[0] = args.iter.count;
3186 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3187 struct sk_buff *skb, const struct nlmsghdr *nlh,
3188 const struct nlattr * const nla[])
3190 const struct nft_set *set;
3194 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla);
3197 if (ctx.table->flags & NFT_TABLE_INACTIVE)
3200 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3202 return PTR_ERR(set);
3203 if (set->flags & NFT_SET_INACTIVE)
3206 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3207 struct netlink_dump_control c = {
3208 .dump = nf_tables_dump_set,
3210 return netlink_dump_start(nlsk, skb, nlh, &c);
3215 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3216 const struct nft_ctx *ctx, u32 seq,
3217 u32 portid, int event, u16 flags,
3218 const struct nft_set *set,
3219 const struct nft_set_elem *elem)
3221 struct nfgenmsg *nfmsg;
3222 struct nlmsghdr *nlh;
3223 struct nlattr *nest;
3226 event |= NFNL_SUBSYS_NFTABLES << 8;
3227 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3230 goto nla_put_failure;
3232 nfmsg = nlmsg_data(nlh);
3233 nfmsg->nfgen_family = ctx->afi->family;
3234 nfmsg->version = NFNETLINK_V0;
3235 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3237 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3238 goto nla_put_failure;
3239 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3240 goto nla_put_failure;
3242 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3244 goto nla_put_failure;
3246 err = nf_tables_fill_setelem(skb, set, elem);
3248 goto nla_put_failure;
3250 nla_nest_end(skb, nest);
3252 nlmsg_end(skb, nlh);
3256 nlmsg_trim(skb, nlh);
3260 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3261 const struct nft_set *set,
3262 const struct nft_set_elem *elem,
3263 int event, u16 flags)
3265 struct net *net = ctx->net;
3266 u32 portid = ctx->portid;
3267 struct sk_buff *skb;
3270 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3274 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3278 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3285 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3289 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3293 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3295 struct nft_set *set)
3297 struct nft_trans *trans;
3299 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3303 nft_trans_elem_set(trans) = set;
3307 void *nft_set_elem_init(const struct nft_set *set,
3308 const struct nft_set_ext_tmpl *tmpl,
3309 const u32 *key, const u32 *data,
3310 u64 timeout, gfp_t gfp)
3312 struct nft_set_ext *ext;
3315 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3319 ext = nft_set_elem_ext(set, elem);
3320 nft_set_ext_init(ext, tmpl);
3322 memcpy(nft_set_ext_key(ext), key, set->klen);
3323 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3324 memcpy(nft_set_ext_data(ext), data, set->dlen);
3325 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3326 *nft_set_ext_expiration(ext) =
3327 jiffies + msecs_to_jiffies(timeout);
3328 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3329 *nft_set_ext_timeout(ext) = timeout;
3334 void nft_set_elem_destroy(const struct nft_set *set, void *elem)
3336 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3338 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3339 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3340 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
3341 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3342 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3346 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3348 static int nft_setelem_parse_flags(const struct nft_set *set,
3349 const struct nlattr *attr, u32 *flags)
3354 *flags = ntohl(nla_get_be32(attr));
3355 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3357 if (!(set->flags & NFT_SET_INTERVAL) &&
3358 *flags & NFT_SET_ELEM_INTERVAL_END)
3364 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3365 const struct nlattr *attr)
3367 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3368 struct nft_data_desc d1, d2;
3369 struct nft_set_ext_tmpl tmpl;
3370 struct nft_set_ext *ext;
3371 struct nft_set_elem elem;
3372 struct nft_set_binding *binding;
3373 struct nft_userdata *udata;
3374 struct nft_data data;
3375 enum nft_registers dreg;
3376 struct nft_trans *trans;
3382 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3383 nft_set_elem_policy);
3387 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3390 nft_set_ext_prepare(&tmpl);
3392 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3396 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3398 if (set->flags & NFT_SET_MAP) {
3399 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3400 !(flags & NFT_SET_ELEM_INTERVAL_END))
3402 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3403 flags & NFT_SET_ELEM_INTERVAL_END)
3406 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3411 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3412 if (!(set->flags & NFT_SET_TIMEOUT))
3414 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_ELEM_TIMEOUT]));
3415 } else if (set->flags & NFT_SET_TIMEOUT) {
3416 timeout = set->timeout;
3419 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3420 nla[NFTA_SET_ELEM_KEY]);
3424 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3427 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3429 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3430 if (timeout != set->timeout)
3431 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3434 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3435 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3436 nla[NFTA_SET_ELEM_DATA]);
3441 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3444 dreg = nft_type_to_reg(set->dtype);
3445 list_for_each_entry(binding, &set->bindings, list) {
3446 struct nft_ctx bind_ctx = {
3448 .table = ctx->table,
3449 .chain = (struct nft_chain *)binding->chain,
3452 if (!(binding->flags & NFT_SET_MAP))
3455 err = nft_validate_register_store(&bind_ctx, dreg,
3462 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
3465 /* The full maximum length of userdata can exceed the maximum
3466 * offset value (U8_MAX) for following extensions, therefor it
3467 * must be the last extension added.
3470 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3471 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3473 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3478 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
3479 timeout, GFP_KERNEL);
3480 if (elem.priv == NULL)
3483 ext = nft_set_elem_ext(set, elem.priv);
3485 *nft_set_ext_flags(ext) = flags;
3487 udata = nft_set_ext_userdata(ext);
3488 udata->len = ulen - 1;
3489 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3492 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3496 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
3497 err = set->ops->insert(set, &elem);
3501 nft_trans_elem(trans) = elem;
3502 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3510 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3511 nft_data_uninit(&data, d2.type);
3513 nft_data_uninit(&elem.key.val, d1.type);
3518 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3519 struct sk_buff *skb, const struct nlmsghdr *nlh,
3520 const struct nlattr * const nla[])
3522 const struct nlattr *attr;
3523 struct nft_set *set;
3527 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3530 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla);
3534 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3536 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3537 set = nf_tables_set_lookup_byid(net,
3538 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3541 return PTR_ERR(set);
3544 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3547 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3549 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact))
3552 err = nft_add_set_elem(&ctx, set, attr);
3554 atomic_dec(&set->nelems);
3561 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3562 const struct nlattr *attr)
3564 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3565 struct nft_set_ext_tmpl tmpl;
3566 struct nft_data_desc desc;
3567 struct nft_set_elem elem;
3568 struct nft_set_ext *ext;
3569 struct nft_trans *trans;
3574 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3575 nft_set_elem_policy);
3580 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3583 nft_set_ext_prepare(&tmpl);
3585 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3589 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3591 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3592 nla[NFTA_SET_ELEM_KEY]);
3597 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3600 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3603 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3605 if (elem.priv == NULL)
3608 ext = nft_set_elem_ext(set, elem.priv);
3610 *nft_set_ext_flags(ext) = flags;
3612 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3613 if (trans == NULL) {
3618 priv = set->ops->deactivate(set, &elem);
3626 nft_trans_elem(trans) = elem;
3627 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3635 nft_data_uninit(&elem.key.val, desc.type);
3640 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3641 struct sk_buff *skb, const struct nlmsghdr *nlh,
3642 const struct nlattr * const nla[])
3644 const struct nlattr *attr;
3645 struct nft_set *set;
3649 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3652 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla);
3656 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3658 return PTR_ERR(set);
3659 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3662 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3663 err = nft_del_setelem(&ctx, set, attr);
3672 void nft_set_gc_batch_release(struct rcu_head *rcu)
3674 struct nft_set_gc_batch *gcb;
3677 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
3678 for (i = 0; i < gcb->head.cnt; i++)
3679 nft_set_elem_destroy(gcb->head.set, gcb->elems[i]);
3682 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
3684 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
3687 struct nft_set_gc_batch *gcb;
3689 gcb = kzalloc(sizeof(*gcb), gfp);
3692 gcb->head.set = set;
3695 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
3697 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
3698 u32 portid, u32 seq)
3700 struct nlmsghdr *nlh;
3701 struct nfgenmsg *nfmsg;
3702 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
3704 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
3706 goto nla_put_failure;
3708 nfmsg = nlmsg_data(nlh);
3709 nfmsg->nfgen_family = AF_UNSPEC;
3710 nfmsg->version = NFNETLINK_V0;
3711 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3713 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
3714 goto nla_put_failure;
3716 nlmsg_end(skb, nlh);
3720 nlmsg_trim(skb, nlh);
3724 static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
3726 struct nlmsghdr *nlh = nlmsg_hdr(skb);
3727 struct sk_buff *skb2;
3730 if (nlmsg_report(nlh) &&
3731 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3735 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3739 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3746 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
3747 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
3750 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
3756 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
3757 struct sk_buff *skb, const struct nlmsghdr *nlh,
3758 const struct nlattr * const nla[])
3760 struct sk_buff *skb2;
3763 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3767 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3772 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3778 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3779 [NFT_MSG_NEWTABLE] = {
3780 .call_batch = nf_tables_newtable,
3781 .attr_count = NFTA_TABLE_MAX,
3782 .policy = nft_table_policy,
3784 [NFT_MSG_GETTABLE] = {
3785 .call = nf_tables_gettable,
3786 .attr_count = NFTA_TABLE_MAX,
3787 .policy = nft_table_policy,
3789 [NFT_MSG_DELTABLE] = {
3790 .call_batch = nf_tables_deltable,
3791 .attr_count = NFTA_TABLE_MAX,
3792 .policy = nft_table_policy,
3794 [NFT_MSG_NEWCHAIN] = {
3795 .call_batch = nf_tables_newchain,
3796 .attr_count = NFTA_CHAIN_MAX,
3797 .policy = nft_chain_policy,
3799 [NFT_MSG_GETCHAIN] = {
3800 .call = nf_tables_getchain,
3801 .attr_count = NFTA_CHAIN_MAX,
3802 .policy = nft_chain_policy,
3804 [NFT_MSG_DELCHAIN] = {
3805 .call_batch = nf_tables_delchain,
3806 .attr_count = NFTA_CHAIN_MAX,
3807 .policy = nft_chain_policy,
3809 [NFT_MSG_NEWRULE] = {
3810 .call_batch = nf_tables_newrule,
3811 .attr_count = NFTA_RULE_MAX,
3812 .policy = nft_rule_policy,
3814 [NFT_MSG_GETRULE] = {
3815 .call = nf_tables_getrule,
3816 .attr_count = NFTA_RULE_MAX,
3817 .policy = nft_rule_policy,
3819 [NFT_MSG_DELRULE] = {
3820 .call_batch = nf_tables_delrule,
3821 .attr_count = NFTA_RULE_MAX,
3822 .policy = nft_rule_policy,
3824 [NFT_MSG_NEWSET] = {
3825 .call_batch = nf_tables_newset,
3826 .attr_count = NFTA_SET_MAX,
3827 .policy = nft_set_policy,
3829 [NFT_MSG_GETSET] = {
3830 .call = nf_tables_getset,
3831 .attr_count = NFTA_SET_MAX,
3832 .policy = nft_set_policy,
3834 [NFT_MSG_DELSET] = {
3835 .call_batch = nf_tables_delset,
3836 .attr_count = NFTA_SET_MAX,
3837 .policy = nft_set_policy,
3839 [NFT_MSG_NEWSETELEM] = {
3840 .call_batch = nf_tables_newsetelem,
3841 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3842 .policy = nft_set_elem_list_policy,
3844 [NFT_MSG_GETSETELEM] = {
3845 .call = nf_tables_getsetelem,
3846 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3847 .policy = nft_set_elem_list_policy,
3849 [NFT_MSG_DELSETELEM] = {
3850 .call_batch = nf_tables_delsetelem,
3851 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3852 .policy = nft_set_elem_list_policy,
3854 [NFT_MSG_GETGEN] = {
3855 .call = nf_tables_getgen,
3859 static void nft_chain_commit_update(struct nft_trans *trans)
3861 struct nft_base_chain *basechain;
3863 if (nft_trans_chain_name(trans)[0])
3864 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3866 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3869 basechain = nft_base_chain(trans->ctx.chain);
3870 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3872 switch (nft_trans_chain_policy(trans)) {
3875 basechain->policy = nft_trans_chain_policy(trans);
3880 static void nf_tables_commit_release(struct nft_trans *trans)
3882 switch (trans->msg_type) {
3883 case NFT_MSG_DELTABLE:
3884 nf_tables_table_destroy(&trans->ctx);
3886 case NFT_MSG_DELCHAIN:
3887 nf_tables_chain_destroy(trans->ctx.chain);
3889 case NFT_MSG_DELRULE:
3890 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3892 case NFT_MSG_DELSET:
3893 nft_set_destroy(nft_trans_set(trans));
3895 case NFT_MSG_DELSETELEM:
3896 nft_set_elem_destroy(nft_trans_elem_set(trans),
3897 nft_trans_elem(trans).priv);
3903 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
3905 struct nft_trans *trans, *next;
3906 struct nft_trans_elem *te;
3908 /* Bump generation counter, invalidate any dump in progress */
3909 while (++net->nft.base_seq == 0);
3911 /* A new generation has just started */
3912 net->nft.gencursor = nft_gencursor_next(net);
3914 /* Make sure all packets have left the previous generation before
3915 * purging old rules.
3919 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3920 switch (trans->msg_type) {
3921 case NFT_MSG_NEWTABLE:
3922 if (nft_trans_table_update(trans)) {
3923 if (!nft_trans_table_enable(trans)) {
3924 nf_tables_table_disable(trans->ctx.afi,
3926 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3929 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3931 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
3932 nft_trans_destroy(trans);
3934 case NFT_MSG_DELTABLE:
3935 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
3937 case NFT_MSG_NEWCHAIN:
3938 if (nft_trans_chain_update(trans))
3939 nft_chain_commit_update(trans);
3941 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
3943 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
3944 nft_trans_destroy(trans);
3946 case NFT_MSG_DELCHAIN:
3947 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
3948 nf_tables_unregister_hooks(trans->ctx.table,
3950 trans->ctx.afi->nops);
3952 case NFT_MSG_NEWRULE:
3953 nft_clear(trans->ctx.net, nft_trans_rule(trans));
3954 nf_tables_rule_notify(&trans->ctx,
3955 nft_trans_rule(trans),
3957 nft_trans_destroy(trans);
3959 case NFT_MSG_DELRULE:
3960 list_del_rcu(&nft_trans_rule(trans)->list);
3961 nf_tables_rule_notify(&trans->ctx,
3962 nft_trans_rule(trans),
3965 case NFT_MSG_NEWSET:
3966 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
3967 /* This avoids hitting -EBUSY when deleting the table
3968 * from the transaction.
3970 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
3971 !list_empty(&nft_trans_set(trans)->bindings))
3972 trans->ctx.table->use--;
3974 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3975 NFT_MSG_NEWSET, GFP_KERNEL);
3976 nft_trans_destroy(trans);
3978 case NFT_MSG_DELSET:
3979 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3980 NFT_MSG_DELSET, GFP_KERNEL);
3982 case NFT_MSG_NEWSETELEM:
3983 te = (struct nft_trans_elem *)trans->data;
3985 te->set->ops->activate(te->set, &te->elem);
3986 nf_tables_setelem_notify(&trans->ctx, te->set,
3988 NFT_MSG_NEWSETELEM, 0);
3989 nft_trans_destroy(trans);
3991 case NFT_MSG_DELSETELEM:
3992 te = (struct nft_trans_elem *)trans->data;
3994 nf_tables_setelem_notify(&trans->ctx, te->set,
3996 NFT_MSG_DELSETELEM, 0);
3997 te->set->ops->remove(te->set, &te->elem);
3998 atomic_dec(&te->set->nelems);
4006 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4007 list_del(&trans->list);
4008 nf_tables_commit_release(trans);
4011 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
4016 static void nf_tables_abort_release(struct nft_trans *trans)
4018 switch (trans->msg_type) {
4019 case NFT_MSG_NEWTABLE:
4020 nf_tables_table_destroy(&trans->ctx);
4022 case NFT_MSG_NEWCHAIN:
4023 nf_tables_chain_destroy(trans->ctx.chain);
4025 case NFT_MSG_NEWRULE:
4026 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4028 case NFT_MSG_NEWSET:
4029 nft_set_destroy(nft_trans_set(trans));
4031 case NFT_MSG_NEWSETELEM:
4032 nft_set_elem_destroy(nft_trans_elem_set(trans),
4033 nft_trans_elem(trans).priv);
4039 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
4041 struct nft_trans *trans, *next;
4042 struct nft_trans_elem *te;
4044 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4046 switch (trans->msg_type) {
4047 case NFT_MSG_NEWTABLE:
4048 if (nft_trans_table_update(trans)) {
4049 if (nft_trans_table_enable(trans)) {
4050 nf_tables_table_disable(trans->ctx.afi,
4052 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4054 nft_trans_destroy(trans);
4056 list_del_rcu(&trans->ctx.table->list);
4059 case NFT_MSG_DELTABLE:
4060 list_add_tail_rcu(&trans->ctx.table->list,
4061 &trans->ctx.afi->tables);
4062 nft_trans_destroy(trans);
4064 case NFT_MSG_NEWCHAIN:
4065 if (nft_trans_chain_update(trans)) {
4066 free_percpu(nft_trans_chain_stats(trans));
4068 nft_trans_destroy(trans);
4070 trans->ctx.table->use--;
4071 list_del_rcu(&trans->ctx.chain->list);
4072 nf_tables_unregister_hooks(trans->ctx.table,
4074 trans->ctx.afi->nops);
4077 case NFT_MSG_DELCHAIN:
4078 trans->ctx.table->use++;
4079 list_add_tail_rcu(&trans->ctx.chain->list,
4080 &trans->ctx.table->chains);
4081 nft_trans_destroy(trans);
4083 case NFT_MSG_NEWRULE:
4084 trans->ctx.chain->use--;
4085 list_del_rcu(&nft_trans_rule(trans)->list);
4087 case NFT_MSG_DELRULE:
4088 trans->ctx.chain->use++;
4089 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4090 nft_trans_destroy(trans);
4092 case NFT_MSG_NEWSET:
4093 trans->ctx.table->use--;
4094 list_del_rcu(&nft_trans_set(trans)->list);
4096 case NFT_MSG_DELSET:
4097 trans->ctx.table->use++;
4098 list_add_tail_rcu(&nft_trans_set(trans)->list,
4099 &trans->ctx.table->sets);
4100 nft_trans_destroy(trans);
4102 case NFT_MSG_NEWSETELEM:
4103 te = (struct nft_trans_elem *)trans->data;
4105 te->set->ops->remove(te->set, &te->elem);
4106 atomic_dec(&te->set->nelems);
4108 case NFT_MSG_DELSETELEM:
4109 te = (struct nft_trans_elem *)trans->data;
4111 te->set->ops->activate(te->set, &te->elem);
4114 nft_trans_destroy(trans);
4121 list_for_each_entry_safe_reverse(trans, next,
4122 &net->nft.commit_list, list) {
4123 list_del(&trans->list);
4124 nf_tables_abort_release(trans);
4130 static const struct nfnetlink_subsystem nf_tables_subsys = {
4131 .name = "nf_tables",
4132 .subsys_id = NFNL_SUBSYS_NFTABLES,
4133 .cb_count = NFT_MSG_MAX,
4135 .commit = nf_tables_commit,
4136 .abort = nf_tables_abort,
4139 int nft_chain_validate_dependency(const struct nft_chain *chain,
4140 enum nft_chain_type type)
4142 const struct nft_base_chain *basechain;
4144 if (chain->flags & NFT_BASE_CHAIN) {
4145 basechain = nft_base_chain(chain);
4146 if (basechain->type->type != type)
4151 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
4153 int nft_chain_validate_hooks(const struct nft_chain *chain,
4154 unsigned int hook_flags)
4156 struct nft_base_chain *basechain;
4158 if (chain->flags & NFT_BASE_CHAIN) {
4159 basechain = nft_base_chain(chain);
4161 if ((1 << basechain->ops[0].hooknum) & hook_flags)
4169 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
4172 * Loop detection - walk through the ruleset beginning at the destination chain
4173 * of a new jump until either the source chain is reached (loop) or all
4174 * reachable chains have been traversed.
4176 * The loop check is performed whenever a new jump verdict is added to an
4177 * expression or verdict map or a verdict map is bound to a new chain.
4180 static int nf_tables_check_loops(const struct nft_ctx *ctx,
4181 const struct nft_chain *chain);
4183 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
4184 const struct nft_set *set,
4185 const struct nft_set_iter *iter,
4186 const struct nft_set_elem *elem)
4188 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4189 const struct nft_data *data;
4191 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4192 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
4195 data = nft_set_ext_data(ext);
4196 switch (data->verdict.code) {
4199 return nf_tables_check_loops(ctx, data->verdict.chain);
4205 static int nf_tables_check_loops(const struct nft_ctx *ctx,
4206 const struct nft_chain *chain)
4208 const struct nft_rule *rule;
4209 const struct nft_expr *expr, *last;
4210 const struct nft_set *set;
4211 struct nft_set_binding *binding;
4212 struct nft_set_iter iter;
4214 if (ctx->chain == chain)
4217 list_for_each_entry(rule, &chain->rules, list) {
4218 nft_rule_for_each_expr(expr, last, rule) {
4219 const struct nft_data *data = NULL;
4222 if (!expr->ops->validate)
4225 err = expr->ops->validate(ctx, expr, &data);
4232 switch (data->verdict.code) {
4235 err = nf_tables_check_loops(ctx,
4236 data->verdict.chain);
4245 list_for_each_entry(set, &ctx->table->sets, list) {
4246 if (!(set->flags & NFT_SET_MAP) ||
4247 set->dtype != NFT_DATA_VERDICT)
4250 list_for_each_entry(binding, &set->bindings, list) {
4251 if (!(binding->flags & NFT_SET_MAP) ||
4252 binding->chain != chain)
4258 iter.fn = nf_tables_loop_check_setelem;
4260 set->ops->walk(ctx, set, &iter);
4270 * nft_parse_register - parse a register value from a netlink attribute
4272 * @attr: netlink attribute
4274 * Parse and translate a register value from a netlink attribute.
4275 * Registers used to be 128 bit wide, these register numbers will be
4276 * mapped to the corresponding 32 bit register numbers.
4278 unsigned int nft_parse_register(const struct nlattr *attr)
4282 reg = ntohl(nla_get_be32(attr));
4284 case NFT_REG_VERDICT...NFT_REG_4:
4285 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
4287 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
4290 EXPORT_SYMBOL_GPL(nft_parse_register);
4293 * nft_dump_register - dump a register value to a netlink attribute
4295 * @skb: socket buffer
4296 * @attr: attribute number
4297 * @reg: register number
4299 * Construct a netlink attribute containing the register number. For
4300 * compatibility reasons, register numbers being a multiple of 4 are
4301 * translated to the corresponding 128 bit register numbers.
4303 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
4305 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
4306 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
4308 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
4310 return nla_put_be32(skb, attr, htonl(reg));
4312 EXPORT_SYMBOL_GPL(nft_dump_register);
4315 * nft_validate_register_load - validate a load from a register
4317 * @reg: the register number
4318 * @len: the length of the data
4320 * Validate that the input register is one of the general purpose
4321 * registers and that the length of the load is within the bounds.
4323 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
4325 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
4329 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
4334 EXPORT_SYMBOL_GPL(nft_validate_register_load);
4337 * nft_validate_register_store - validate an expressions' register store
4339 * @ctx: context of the expression performing the load
4340 * @reg: the destination register number
4341 * @data: the data to load
4342 * @type: the data type
4343 * @len: the length of the data
4345 * Validate that a data load uses the appropriate data type for
4346 * the destination register and the length is within the bounds.
4347 * A value of NULL for the data means that its runtime gathered
4350 int nft_validate_register_store(const struct nft_ctx *ctx,
4351 enum nft_registers reg,
4352 const struct nft_data *data,
4353 enum nft_data_types type, unsigned int len)
4358 case NFT_REG_VERDICT:
4359 if (type != NFT_DATA_VERDICT)
4363 (data->verdict.code == NFT_GOTO ||
4364 data->verdict.code == NFT_JUMP)) {
4365 err = nf_tables_check_loops(ctx, data->verdict.chain);
4369 if (ctx->chain->level + 1 >
4370 data->verdict.chain->level) {
4371 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
4373 data->verdict.chain->level = ctx->chain->level + 1;
4379 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
4383 if (reg * NFT_REG32_SIZE + len >
4384 FIELD_SIZEOF(struct nft_regs, data))
4387 if (data != NULL && type != NFT_DATA_VALUE)
4392 EXPORT_SYMBOL_GPL(nft_validate_register_store);
4394 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
4395 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
4396 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
4397 .len = NFT_CHAIN_MAXNAMELEN - 1 },
4400 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
4401 struct nft_data_desc *desc, const struct nlattr *nla)
4403 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
4404 struct nft_chain *chain;
4407 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
4411 if (!tb[NFTA_VERDICT_CODE])
4413 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
4415 switch (data->verdict.code) {
4417 switch (data->verdict.code & NF_VERDICT_MASK) {
4432 if (!tb[NFTA_VERDICT_CHAIN])
4434 chain = nf_tables_chain_lookup(ctx->table,
4435 tb[NFTA_VERDICT_CHAIN]);
4437 return PTR_ERR(chain);
4438 if (chain->flags & NFT_BASE_CHAIN)
4442 data->verdict.chain = chain;
4446 desc->len = sizeof(data->verdict);
4447 desc->type = NFT_DATA_VERDICT;
4451 static void nft_verdict_uninit(const struct nft_data *data)
4453 switch (data->verdict.code) {
4456 data->verdict.chain->use--;
4461 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
4463 struct nlattr *nest;
4465 nest = nla_nest_start(skb, type);
4467 goto nla_put_failure;
4469 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
4470 goto nla_put_failure;
4475 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
4477 goto nla_put_failure;
4479 nla_nest_end(skb, nest);
4486 static int nft_value_init(const struct nft_ctx *ctx,
4487 struct nft_data *data, unsigned int size,
4488 struct nft_data_desc *desc, const struct nlattr *nla)
4498 nla_memcpy(data->data, nla, len);
4499 desc->type = NFT_DATA_VALUE;
4504 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
4507 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
4510 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
4511 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
4512 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
4516 * nft_data_init - parse nf_tables data netlink attributes
4518 * @ctx: context of the expression using the data
4519 * @data: destination struct nft_data
4520 * @size: maximum data length
4521 * @desc: data description
4522 * @nla: netlink attribute containing data
4524 * Parse the netlink data attributes and initialize a struct nft_data.
4525 * The type and length of data are returned in the data description.
4527 * The caller can indicate that it only wants to accept data of type
4528 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4530 int nft_data_init(const struct nft_ctx *ctx,
4531 struct nft_data *data, unsigned int size,
4532 struct nft_data_desc *desc, const struct nlattr *nla)
4534 struct nlattr *tb[NFTA_DATA_MAX + 1];
4537 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
4541 if (tb[NFTA_DATA_VALUE])
4542 return nft_value_init(ctx, data, size, desc,
4543 tb[NFTA_DATA_VALUE]);
4544 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
4545 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
4548 EXPORT_SYMBOL_GPL(nft_data_init);
4551 * nft_data_uninit - release a nft_data item
4553 * @data: struct nft_data to release
4554 * @type: type of data
4556 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4557 * all others need to be released by calling this function.
4559 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
4561 if (type < NFT_DATA_VERDICT)
4564 case NFT_DATA_VERDICT:
4565 return nft_verdict_uninit(data);
4570 EXPORT_SYMBOL_GPL(nft_data_uninit);
4572 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4573 enum nft_data_types type, unsigned int len)
4575 struct nlattr *nest;
4578 nest = nla_nest_start(skb, attr);
4583 case NFT_DATA_VALUE:
4584 err = nft_value_dump(skb, data, len);
4586 case NFT_DATA_VERDICT:
4587 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
4594 nla_nest_end(skb, nest);
4597 EXPORT_SYMBOL_GPL(nft_data_dump);
4599 static int __net_init nf_tables_init_net(struct net *net)
4601 INIT_LIST_HEAD(&net->nft.af_info);
4602 INIT_LIST_HEAD(&net->nft.commit_list);
4603 net->nft.base_seq = 1;
4607 int __nft_release_basechain(struct nft_ctx *ctx)
4609 struct nft_rule *rule, *nr;
4611 BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
4613 nf_tables_unregister_hooks(ctx->chain->table, ctx->chain,
4615 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
4616 list_del(&rule->list);
4618 nf_tables_rule_destroy(ctx, rule);
4620 list_del(&ctx->chain->list);
4622 nf_tables_chain_destroy(ctx->chain);
4626 EXPORT_SYMBOL_GPL(__nft_release_basechain);
4628 /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
4629 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
4631 struct nft_table *table, *nt;
4632 struct nft_chain *chain, *nc;
4633 struct nft_rule *rule, *nr;
4634 struct nft_set *set, *ns;
4635 struct nft_ctx ctx = {
4640 list_for_each_entry_safe(table, nt, &afi->tables, list) {
4641 list_for_each_entry(chain, &table->chains, list)
4642 nf_tables_unregister_hooks(table, chain, afi->nops);
4643 /* No packets are walking on these chains anymore. */
4645 list_for_each_entry(chain, &table->chains, list) {
4647 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
4648 list_del(&rule->list);
4650 nf_tables_rule_destroy(&ctx, rule);
4653 list_for_each_entry_safe(set, ns, &table->sets, list) {
4654 list_del(&set->list);
4656 nft_set_destroy(set);
4658 list_for_each_entry_safe(chain, nc, &table->chains, list) {
4659 list_del(&chain->list);
4661 nf_tables_chain_destroy(chain);
4663 list_del(&table->list);
4664 nf_tables_table_destroy(&ctx);
4668 static struct pernet_operations nf_tables_net_ops = {
4669 .init = nf_tables_init_net,
4672 static int __init nf_tables_module_init(void)
4676 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4683 err = nf_tables_core_module_init();
4687 err = nfnetlink_subsys_register(&nf_tables_subsys);
4691 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4692 return register_pernet_subsys(&nf_tables_net_ops);
4694 nf_tables_core_module_exit();
4701 static void __exit nf_tables_module_exit(void)
4703 unregister_pernet_subsys(&nf_tables_net_ops);
4704 nfnetlink_subsys_unregister(&nf_tables_subsys);
4706 nf_tables_core_module_exit();
4710 module_init(nf_tables_module_init);
4711 module_exit(nf_tables_module_exit);
4713 MODULE_LICENSE("GPL");
4714 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4715 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);