2 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/list.h>
14 #include <linux/skbuff.h>
15 #include <linux/netlink.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_tables_core.h>
20 #include <net/netfilter/nf_tables.h>
21 #include <net/net_namespace.h>
24 static LIST_HEAD(nf_tables_expressions);
27 * nft_register_afinfo - register nf_tables address family info
29 * @afi: address family info to register
31 * Register the address family for use with nf_tables. Returns zero on
32 * success or a negative errno code otherwise.
34 int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
36 INIT_LIST_HEAD(&afi->tables);
37 nfnl_lock(NFNL_SUBSYS_NFTABLES);
38 list_add_tail_rcu(&afi->list, &net->nft.af_info);
39 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
42 EXPORT_SYMBOL_GPL(nft_register_afinfo);
45 * nft_unregister_afinfo - unregister nf_tables address family info
47 * @afi: address family info to unregister
49 * Unregister the address family for use with nf_tables.
51 void nft_unregister_afinfo(struct nft_af_info *afi)
53 nfnl_lock(NFNL_SUBSYS_NFTABLES);
54 list_del_rcu(&afi->list);
55 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
57 EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
59 static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
61 struct nft_af_info *afi;
63 list_for_each_entry(afi, &net->nft.af_info, list) {
64 if (afi->family == family)
70 static struct nft_af_info *
71 nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
73 struct nft_af_info *afi;
75 afi = nft_afinfo_lookup(net, family);
80 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
81 request_module("nft-afinfo-%u", family);
82 nfnl_lock(NFNL_SUBSYS_NFTABLES);
83 afi = nft_afinfo_lookup(net, family);
85 return ERR_PTR(-EAGAIN);
88 return ERR_PTR(-EAFNOSUPPORT);
91 static void nft_ctx_init(struct nft_ctx *ctx,
92 const struct sk_buff *skb,
93 const struct nlmsghdr *nlh,
94 struct nft_af_info *afi,
95 struct nft_table *table,
96 struct nft_chain *chain,
97 const struct nlattr * const *nla)
99 ctx->net = sock_net(skb->sk);
104 ctx->portid = NETLINK_CB(skb).portid;
105 ctx->report = nlmsg_report(nlh);
106 ctx->seq = nlh->nlmsg_seq;
109 static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type,
112 struct nft_trans *trans;
114 trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL);
118 trans->msg_type = msg_type;
124 static void nft_trans_destroy(struct nft_trans *trans)
126 list_del(&trans->list);
134 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
135 const struct nlattr *nla)
137 struct nft_table *table;
139 list_for_each_entry(table, &afi->tables, list) {
140 if (!nla_strcmp(nla, table->name))
146 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
147 const struct nlattr *nla)
149 struct nft_table *table;
152 return ERR_PTR(-EINVAL);
154 table = nft_table_lookup(afi, nla);
158 return ERR_PTR(-ENOENT);
161 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
163 return ++table->hgenerator;
166 static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
168 static const struct nf_chain_type *
169 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
173 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
174 if (chain_type[family][i] != NULL &&
175 !nla_strcmp(nla, chain_type[family][i]->name))
176 return chain_type[family][i];
181 static const struct nf_chain_type *
182 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
183 const struct nlattr *nla,
186 const struct nf_chain_type *type;
188 type = __nf_tables_chain_type_lookup(afi->family, nla);
191 #ifdef CONFIG_MODULES
193 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
194 request_module("nft-chain-%u-%.*s", afi->family,
195 nla_len(nla), (const char *)nla_data(nla));
196 nfnl_lock(NFNL_SUBSYS_NFTABLES);
197 type = __nf_tables_chain_type_lookup(afi->family, nla);
199 return ERR_PTR(-EAGAIN);
202 return ERR_PTR(-ENOENT);
205 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
206 [NFTA_TABLE_NAME] = { .type = NLA_STRING },
207 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
210 static int nf_tables_fill_table_info(struct sk_buff *skb, u32 portid, u32 seq,
211 int event, u32 flags, int family,
212 const struct nft_table *table)
214 struct nlmsghdr *nlh;
215 struct nfgenmsg *nfmsg;
217 event |= NFNL_SUBSYS_NFTABLES << 8;
218 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
220 goto nla_put_failure;
222 nfmsg = nlmsg_data(nlh);
223 nfmsg->nfgen_family = family;
224 nfmsg->version = NFNETLINK_V0;
227 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
228 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
229 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
230 goto nla_put_failure;
232 return nlmsg_end(skb, nlh);
235 nlmsg_trim(skb, nlh);
239 static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
245 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
249 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
253 err = nf_tables_fill_table_info(skb, ctx->portid, ctx->seq, event, 0,
254 ctx->afi->family, ctx->table);
260 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
261 ctx->report, GFP_KERNEL);
264 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
270 static int nf_tables_dump_tables(struct sk_buff *skb,
271 struct netlink_callback *cb)
273 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
274 const struct nft_af_info *afi;
275 const struct nft_table *table;
276 unsigned int idx = 0, s_idx = cb->args[0];
277 struct net *net = sock_net(skb->sk);
278 int family = nfmsg->nfgen_family;
281 cb->seq = net->nft.base_seq;
283 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
284 if (family != NFPROTO_UNSPEC && family != afi->family)
287 list_for_each_entry_rcu(table, &afi->tables, list) {
291 memset(&cb->args[1], 0,
292 sizeof(cb->args) - sizeof(cb->args[0]));
293 if (nf_tables_fill_table_info(skb,
294 NETLINK_CB(cb->skb).portid,
298 afi->family, table) < 0)
301 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
312 /* Internal table flags */
313 #define NFT_TABLE_INACTIVE (1 << 15)
315 static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb,
316 const struct nlmsghdr *nlh,
317 const struct nlattr * const nla[])
319 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
320 const struct nft_af_info *afi;
321 const struct nft_table *table;
322 struct sk_buff *skb2;
323 struct net *net = sock_net(skb->sk);
324 int family = nfmsg->nfgen_family;
327 if (nlh->nlmsg_flags & NLM_F_DUMP) {
328 struct netlink_dump_control c = {
329 .dump = nf_tables_dump_tables,
331 return netlink_dump_start(nlsk, skb, nlh, &c);
334 afi = nf_tables_afinfo_lookup(net, family, false);
338 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
340 return PTR_ERR(table);
341 if (table->flags & NFT_TABLE_INACTIVE)
344 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
348 err = nf_tables_fill_table_info(skb2, NETLINK_CB(skb).portid,
349 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
354 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
361 static int nf_tables_table_enable(const struct nft_af_info *afi,
362 struct nft_table *table)
364 struct nft_chain *chain;
367 list_for_each_entry(chain, &table->chains, list) {
368 if (!(chain->flags & NFT_BASE_CHAIN))
371 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
379 list_for_each_entry(chain, &table->chains, list) {
380 if (!(chain->flags & NFT_BASE_CHAIN))
386 nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops);
391 static void nf_tables_table_disable(const struct nft_af_info *afi,
392 struct nft_table *table)
394 struct nft_chain *chain;
396 list_for_each_entry(chain, &table->chains, list) {
397 if (chain->flags & NFT_BASE_CHAIN)
398 nf_unregister_hooks(nft_base_chain(chain)->ops,
403 static int nf_tables_updtable(struct nft_ctx *ctx)
405 struct nft_trans *trans;
409 if (!ctx->nla[NFTA_TABLE_FLAGS])
412 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
413 if (flags & ~NFT_TABLE_F_DORMANT)
416 if (flags == ctx->table->flags)
419 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
420 sizeof(struct nft_trans_table));
424 if ((flags & NFT_TABLE_F_DORMANT) &&
425 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
426 nft_trans_table_enable(trans) = false;
427 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
428 ctx->table->flags & NFT_TABLE_F_DORMANT) {
429 ret = nf_tables_table_enable(ctx->afi, ctx->table);
431 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
432 nft_trans_table_enable(trans) = true;
438 nft_trans_table_update(trans) = true;
439 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
442 nft_trans_destroy(trans);
446 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
448 struct nft_trans *trans;
450 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
454 if (msg_type == NFT_MSG_NEWTABLE)
455 ctx->table->flags |= NFT_TABLE_INACTIVE;
457 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
461 static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
462 const struct nlmsghdr *nlh,
463 const struct nlattr * const nla[])
465 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
466 const struct nlattr *name;
467 struct nft_af_info *afi;
468 struct nft_table *table;
469 struct net *net = sock_net(skb->sk);
470 int family = nfmsg->nfgen_family;
475 afi = nf_tables_afinfo_lookup(net, family, true);
479 name = nla[NFTA_TABLE_NAME];
480 table = nf_tables_table_lookup(afi, name);
482 if (PTR_ERR(table) != -ENOENT)
483 return PTR_ERR(table);
488 if (table->flags & NFT_TABLE_INACTIVE)
490 if (nlh->nlmsg_flags & NLM_F_EXCL)
492 if (nlh->nlmsg_flags & NLM_F_REPLACE)
495 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
496 return nf_tables_updtable(&ctx);
499 if (nla[NFTA_TABLE_FLAGS]) {
500 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
501 if (flags & ~NFT_TABLE_F_DORMANT)
505 if (!try_module_get(afi->owner))
506 return -EAFNOSUPPORT;
508 table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL);
510 module_put(afi->owner);
514 nla_strlcpy(table->name, name, nla_len(name));
515 INIT_LIST_HEAD(&table->chains);
516 INIT_LIST_HEAD(&table->sets);
517 table->flags = flags;
519 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
520 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
523 module_put(afi->owner);
526 list_add_tail_rcu(&table->list, &afi->tables);
530 static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb,
531 const struct nlmsghdr *nlh,
532 const struct nlattr * const nla[])
534 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
535 struct nft_af_info *afi;
536 struct nft_table *table;
537 struct net *net = sock_net(skb->sk);
538 int family = nfmsg->nfgen_family, err;
541 afi = nf_tables_afinfo_lookup(net, family, false);
545 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
547 return PTR_ERR(table);
548 if (table->flags & NFT_TABLE_INACTIVE)
553 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
554 err = nft_trans_table_add(&ctx, NFT_MSG_DELTABLE);
558 list_del_rcu(&table->list);
562 static void nf_tables_table_destroy(struct nft_ctx *ctx)
564 BUG_ON(ctx->table->use > 0);
567 module_put(ctx->afi->owner);
570 int nft_register_chain_type(const struct nf_chain_type *ctype)
574 nfnl_lock(NFNL_SUBSYS_NFTABLES);
575 if (chain_type[ctype->family][ctype->type] != NULL) {
579 chain_type[ctype->family][ctype->type] = ctype;
581 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
584 EXPORT_SYMBOL_GPL(nft_register_chain_type);
586 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
588 nfnl_lock(NFNL_SUBSYS_NFTABLES);
589 chain_type[ctype->family][ctype->type] = NULL;
590 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
592 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
598 static struct nft_chain *
599 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
601 struct nft_chain *chain;
603 list_for_each_entry(chain, &table->chains, list) {
604 if (chain->handle == handle)
608 return ERR_PTR(-ENOENT);
611 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
612 const struct nlattr *nla)
614 struct nft_chain *chain;
617 return ERR_PTR(-EINVAL);
619 list_for_each_entry(chain, &table->chains, list) {
620 if (!nla_strcmp(nla, chain->name))
624 return ERR_PTR(-ENOENT);
627 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
628 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
629 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
630 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
631 .len = NFT_CHAIN_MAXNAMELEN - 1 },
632 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
633 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
634 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
635 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
638 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
639 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
640 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
643 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
645 struct nft_stats *cpu_stats, total;
649 memset(&total, 0, sizeof(total));
650 for_each_possible_cpu(cpu) {
651 cpu_stats = per_cpu_ptr(stats, cpu);
652 total.pkts += cpu_stats->pkts;
653 total.bytes += cpu_stats->bytes;
655 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
657 goto nla_put_failure;
659 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) ||
660 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes)))
661 goto nla_put_failure;
663 nla_nest_end(skb, nest);
670 static int nf_tables_fill_chain_info(struct sk_buff *skb, u32 portid, u32 seq,
671 int event, u32 flags, int family,
672 const struct nft_table *table,
673 const struct nft_chain *chain)
675 struct nlmsghdr *nlh;
676 struct nfgenmsg *nfmsg;
678 event |= NFNL_SUBSYS_NFTABLES << 8;
679 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
681 goto nla_put_failure;
683 nfmsg = nlmsg_data(nlh);
684 nfmsg->nfgen_family = family;
685 nfmsg->version = NFNETLINK_V0;
688 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
689 goto nla_put_failure;
690 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle)))
691 goto nla_put_failure;
692 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
693 goto nla_put_failure;
695 if (chain->flags & NFT_BASE_CHAIN) {
696 const struct nft_base_chain *basechain = nft_base_chain(chain);
697 const struct nf_hook_ops *ops = &basechain->ops[0];
700 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
702 goto nla_put_failure;
703 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
704 goto nla_put_failure;
705 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
706 goto nla_put_failure;
707 nla_nest_end(skb, nest);
709 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
710 htonl(basechain->policy)))
711 goto nla_put_failure;
713 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
714 goto nla_put_failure;
716 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
717 goto nla_put_failure;
720 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
721 goto nla_put_failure;
723 return nlmsg_end(skb, nlh);
726 nlmsg_trim(skb, nlh);
730 static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
736 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
740 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
744 err = nf_tables_fill_chain_info(skb, ctx->portid, ctx->seq, event, 0,
745 ctx->afi->family, ctx->table,
752 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
753 ctx->report, GFP_KERNEL);
756 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
762 static int nf_tables_dump_chains(struct sk_buff *skb,
763 struct netlink_callback *cb)
765 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
766 const struct nft_af_info *afi;
767 const struct nft_table *table;
768 const struct nft_chain *chain;
769 unsigned int idx = 0, s_idx = cb->args[0];
770 struct net *net = sock_net(skb->sk);
771 int family = nfmsg->nfgen_family;
774 cb->seq = net->nft.base_seq;
776 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
777 if (family != NFPROTO_UNSPEC && family != afi->family)
780 list_for_each_entry_rcu(table, &afi->tables, list) {
781 list_for_each_entry_rcu(chain, &table->chains, list) {
785 memset(&cb->args[1], 0,
786 sizeof(cb->args) - sizeof(cb->args[0]));
787 if (nf_tables_fill_chain_info(skb, NETLINK_CB(cb->skb).portid,
791 afi->family, table, chain) < 0)
794 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
806 static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb,
807 const struct nlmsghdr *nlh,
808 const struct nlattr * const nla[])
810 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
811 const struct nft_af_info *afi;
812 const struct nft_table *table;
813 const struct nft_chain *chain;
814 struct sk_buff *skb2;
815 struct net *net = sock_net(skb->sk);
816 int family = nfmsg->nfgen_family;
819 if (nlh->nlmsg_flags & NLM_F_DUMP) {
820 struct netlink_dump_control c = {
821 .dump = nf_tables_dump_chains,
823 return netlink_dump_start(nlsk, skb, nlh, &c);
826 afi = nf_tables_afinfo_lookup(net, family, false);
830 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
832 return PTR_ERR(table);
833 if (table->flags & NFT_TABLE_INACTIVE)
836 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
838 return PTR_ERR(chain);
839 if (chain->flags & NFT_CHAIN_INACTIVE)
842 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
846 err = nf_tables_fill_chain_info(skb2, NETLINK_CB(skb).portid,
847 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
848 family, table, chain);
852 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
859 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
860 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
861 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
864 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
866 struct nlattr *tb[NFTA_COUNTER_MAX+1];
867 struct nft_stats __percpu *newstats;
868 struct nft_stats *stats;
871 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
875 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
876 return ERR_PTR(-EINVAL);
878 newstats = alloc_percpu(struct nft_stats);
879 if (newstats == NULL)
880 return ERR_PTR(-ENOMEM);
882 /* Restore old counters on this cpu, no problem. Per-cpu statistics
883 * are not exposed to userspace.
885 stats = this_cpu_ptr(newstats);
886 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
887 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
892 static void nft_chain_stats_replace(struct nft_base_chain *chain,
893 struct nft_stats __percpu *newstats)
896 struct nft_stats __percpu *oldstats =
897 nft_dereference(chain->stats);
899 rcu_assign_pointer(chain->stats, newstats);
901 free_percpu(oldstats);
903 rcu_assign_pointer(chain->stats, newstats);
906 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
908 struct nft_trans *trans;
910 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
914 if (msg_type == NFT_MSG_NEWCHAIN)
915 ctx->chain->flags |= NFT_CHAIN_INACTIVE;
917 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
921 static void nf_tables_chain_destroy(struct nft_chain *chain)
923 BUG_ON(chain->use > 0);
925 if (chain->flags & NFT_BASE_CHAIN) {
926 module_put(nft_base_chain(chain)->type->owner);
927 free_percpu(nft_base_chain(chain)->stats);
928 kfree(nft_base_chain(chain));
934 static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
935 const struct nlmsghdr *nlh,
936 const struct nlattr * const nla[])
938 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
939 const struct nlattr * uninitialized_var(name);
940 struct nft_af_info *afi;
941 struct nft_table *table;
942 struct nft_chain *chain;
943 struct nft_base_chain *basechain = NULL;
944 struct nlattr *ha[NFTA_HOOK_MAX + 1];
945 struct net *net = sock_net(skb->sk);
946 int family = nfmsg->nfgen_family;
947 u8 policy = NF_ACCEPT;
950 struct nft_stats __percpu *stats;
955 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
957 afi = nf_tables_afinfo_lookup(net, family, true);
961 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
963 return PTR_ERR(table);
966 name = nla[NFTA_CHAIN_NAME];
968 if (nla[NFTA_CHAIN_HANDLE]) {
969 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
970 chain = nf_tables_chain_lookup_byhandle(table, handle);
972 return PTR_ERR(chain);
974 chain = nf_tables_chain_lookup(table, name);
976 if (PTR_ERR(chain) != -ENOENT)
977 return PTR_ERR(chain);
982 if (nla[NFTA_CHAIN_POLICY]) {
983 if ((chain != NULL &&
984 !(chain->flags & NFT_BASE_CHAIN)) ||
985 nla[NFTA_CHAIN_HOOK] == NULL)
988 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
999 struct nft_stats *stats = NULL;
1000 struct nft_trans *trans;
1002 if (chain->flags & NFT_CHAIN_INACTIVE)
1004 if (nlh->nlmsg_flags & NLM_F_EXCL)
1006 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1009 if (nla[NFTA_CHAIN_HANDLE] && name &&
1010 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
1013 if (nla[NFTA_CHAIN_COUNTERS]) {
1014 if (!(chain->flags & NFT_BASE_CHAIN))
1017 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1019 return PTR_ERR(stats);
1022 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1023 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1024 sizeof(struct nft_trans_chain));
1028 nft_trans_chain_stats(trans) = stats;
1029 nft_trans_chain_update(trans) = true;
1031 if (nla[NFTA_CHAIN_POLICY])
1032 nft_trans_chain_policy(trans) = policy;
1034 nft_trans_chain_policy(trans) = -1;
1036 if (nla[NFTA_CHAIN_HANDLE] && name) {
1037 nla_strlcpy(nft_trans_chain_name(trans), name,
1038 NFT_CHAIN_MAXNAMELEN);
1040 list_add_tail(&trans->list, &net->nft.commit_list);
1044 if (table->use == UINT_MAX)
1047 if (nla[NFTA_CHAIN_HOOK]) {
1048 const struct nf_chain_type *type;
1049 struct nf_hook_ops *ops;
1051 u32 hooknum, priority;
1053 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1054 if (nla[NFTA_CHAIN_TYPE]) {
1055 type = nf_tables_chain_type_lookup(afi,
1056 nla[NFTA_CHAIN_TYPE],
1059 return PTR_ERR(type);
1062 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1066 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1067 ha[NFTA_HOOK_PRIORITY] == NULL)
1070 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1071 if (hooknum >= afi->nhooks)
1073 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1075 if (!(type->hook_mask & (1 << hooknum)))
1077 if (!try_module_get(type->owner))
1079 hookfn = type->hooks[hooknum];
1081 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1082 if (basechain == NULL)
1085 if (nla[NFTA_CHAIN_COUNTERS]) {
1086 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1087 if (IS_ERR(stats)) {
1088 module_put(type->owner);
1090 return PTR_ERR(stats);
1092 basechain->stats = stats;
1094 stats = alloc_percpu(struct nft_stats);
1095 if (IS_ERR(stats)) {
1096 module_put(type->owner);
1098 return PTR_ERR(stats);
1100 rcu_assign_pointer(basechain->stats, stats);
1103 basechain->type = type;
1104 chain = &basechain->chain;
1106 for (i = 0; i < afi->nops; i++) {
1107 ops = &basechain->ops[i];
1109 ops->owner = afi->owner;
1110 ops->hooknum = hooknum;
1111 ops->priority = priority;
1113 ops->hook = afi->hooks[ops->hooknum];
1116 if (afi->hook_ops_init)
1117 afi->hook_ops_init(ops, i);
1120 chain->flags |= NFT_BASE_CHAIN;
1121 basechain->policy = policy;
1123 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1128 INIT_LIST_HEAD(&chain->rules);
1129 chain->handle = nf_tables_alloc_handle(table);
1131 chain->table = table;
1132 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1134 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1135 chain->flags & NFT_BASE_CHAIN) {
1136 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
1141 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1142 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1147 list_add_tail_rcu(&chain->list, &table->chains);
1150 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1151 chain->flags & NFT_BASE_CHAIN) {
1152 nf_unregister_hooks(nft_base_chain(chain)->ops,
1156 nf_tables_chain_destroy(chain);
1160 static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
1161 const struct nlmsghdr *nlh,
1162 const struct nlattr * const nla[])
1164 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1165 struct nft_af_info *afi;
1166 struct nft_table *table;
1167 struct nft_chain *chain;
1168 struct net *net = sock_net(skb->sk);
1169 int family = nfmsg->nfgen_family;
1173 afi = nf_tables_afinfo_lookup(net, family, false);
1175 return PTR_ERR(afi);
1177 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1179 return PTR_ERR(table);
1180 if (table->flags & NFT_TABLE_INACTIVE)
1183 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1185 return PTR_ERR(chain);
1186 if (chain->flags & NFT_CHAIN_INACTIVE)
1191 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1192 err = nft_trans_chain_add(&ctx, NFT_MSG_DELCHAIN);
1197 list_del_rcu(&chain->list);
1206 * nft_register_expr - register nf_tables expr type
1209 * Registers the expr type for use with nf_tables. Returns zero on
1210 * success or a negative errno code otherwise.
1212 int nft_register_expr(struct nft_expr_type *type)
1214 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1215 if (type->family == NFPROTO_UNSPEC)
1216 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1218 list_add_rcu(&type->list, &nf_tables_expressions);
1219 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1222 EXPORT_SYMBOL_GPL(nft_register_expr);
1225 * nft_unregister_expr - unregister nf_tables expr type
1228 * Unregisters the expr typefor use with nf_tables.
1230 void nft_unregister_expr(struct nft_expr_type *type)
1232 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1233 list_del_rcu(&type->list);
1234 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1236 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1238 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1241 const struct nft_expr_type *type;
1243 list_for_each_entry(type, &nf_tables_expressions, list) {
1244 if (!nla_strcmp(nla, type->name) &&
1245 (!type->family || type->family == family))
1251 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1254 const struct nft_expr_type *type;
1257 return ERR_PTR(-EINVAL);
1259 type = __nft_expr_type_get(family, nla);
1260 if (type != NULL && try_module_get(type->owner))
1263 #ifdef CONFIG_MODULES
1265 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1266 request_module("nft-expr-%u-%.*s", family,
1267 nla_len(nla), (char *)nla_data(nla));
1268 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1269 if (__nft_expr_type_get(family, nla))
1270 return ERR_PTR(-EAGAIN);
1272 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1273 request_module("nft-expr-%.*s",
1274 nla_len(nla), (char *)nla_data(nla));
1275 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1276 if (__nft_expr_type_get(family, nla))
1277 return ERR_PTR(-EAGAIN);
1280 return ERR_PTR(-ENOENT);
1283 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1284 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1285 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1288 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1289 const struct nft_expr *expr)
1291 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1292 goto nla_put_failure;
1294 if (expr->ops->dump) {
1295 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1297 goto nla_put_failure;
1298 if (expr->ops->dump(skb, expr) < 0)
1299 goto nla_put_failure;
1300 nla_nest_end(skb, data);
1309 struct nft_expr_info {
1310 const struct nft_expr_ops *ops;
1311 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1314 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1315 const struct nlattr *nla,
1316 struct nft_expr_info *info)
1318 const struct nft_expr_type *type;
1319 const struct nft_expr_ops *ops;
1320 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1323 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1327 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1329 return PTR_ERR(type);
1331 if (tb[NFTA_EXPR_DATA]) {
1332 err = nla_parse_nested(info->tb, type->maxattr,
1333 tb[NFTA_EXPR_DATA], type->policy);
1337 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1339 if (type->select_ops != NULL) {
1340 ops = type->select_ops(ctx,
1341 (const struct nlattr * const *)info->tb);
1353 module_put(type->owner);
1357 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1358 const struct nft_expr_info *info,
1359 struct nft_expr *expr)
1361 const struct nft_expr_ops *ops = info->ops;
1366 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1378 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1379 struct nft_expr *expr)
1381 if (expr->ops->destroy)
1382 expr->ops->destroy(ctx, expr);
1383 module_put(expr->ops->type->owner);
1390 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1393 struct nft_rule *rule;
1395 // FIXME: this sucks
1396 list_for_each_entry(rule, &chain->rules, list) {
1397 if (handle == rule->handle)
1401 return ERR_PTR(-ENOENT);
1404 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1405 const struct nlattr *nla)
1408 return ERR_PTR(-EINVAL);
1410 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1413 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1414 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1415 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1416 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1417 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1418 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1419 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1420 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1421 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1422 .len = NFT_USERDATA_MAXLEN },
1425 static int nf_tables_fill_rule_info(struct sk_buff *skb, u32 portid, u32 seq,
1426 int event, u32 flags, int family,
1427 const struct nft_table *table,
1428 const struct nft_chain *chain,
1429 const struct nft_rule *rule)
1431 struct nlmsghdr *nlh;
1432 struct nfgenmsg *nfmsg;
1433 const struct nft_expr *expr, *next;
1434 struct nlattr *list;
1435 const struct nft_rule *prule;
1436 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1438 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1441 goto nla_put_failure;
1443 nfmsg = nlmsg_data(nlh);
1444 nfmsg->nfgen_family = family;
1445 nfmsg->version = NFNETLINK_V0;
1448 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1449 goto nla_put_failure;
1450 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1451 goto nla_put_failure;
1452 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle)))
1453 goto nla_put_failure;
1455 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1456 prule = list_entry(rule->list.prev, struct nft_rule, list);
1457 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1458 cpu_to_be64(prule->handle)))
1459 goto nla_put_failure;
1462 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1464 goto nla_put_failure;
1465 nft_rule_for_each_expr(expr, next, rule) {
1466 struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM);
1468 goto nla_put_failure;
1469 if (nf_tables_fill_expr_info(skb, expr) < 0)
1470 goto nla_put_failure;
1471 nla_nest_end(skb, elem);
1473 nla_nest_end(skb, list);
1476 nla_put(skb, NFTA_RULE_USERDATA, rule->ulen, nft_userdata(rule)))
1477 goto nla_put_failure;
1479 return nlmsg_end(skb, nlh);
1482 nlmsg_trim(skb, nlh);
1486 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1487 const struct nft_rule *rule,
1490 struct sk_buff *skb;
1494 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1498 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1502 err = nf_tables_fill_rule_info(skb, ctx->portid, ctx->seq, event, 0,
1503 ctx->afi->family, ctx->table,
1510 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1511 ctx->report, GFP_KERNEL);
1514 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1521 nft_rule_is_active(struct net *net, const struct nft_rule *rule)
1523 return (rule->genmask & (1 << net->nft.gencursor)) == 0;
1526 static inline int gencursor_next(struct net *net)
1528 return net->nft.gencursor+1 == 1 ? 1 : 0;
1532 nft_rule_is_active_next(struct net *net, const struct nft_rule *rule)
1534 return (rule->genmask & (1 << gencursor_next(net))) == 0;
1538 nft_rule_activate_next(struct net *net, struct nft_rule *rule)
1540 /* Now inactive, will be active in the future */
1541 rule->genmask = (1 << net->nft.gencursor);
1545 nft_rule_disactivate_next(struct net *net, struct nft_rule *rule)
1547 rule->genmask = (1 << gencursor_next(net));
1550 static inline void nft_rule_clear(struct net *net, struct nft_rule *rule)
1555 static int nf_tables_dump_rules(struct sk_buff *skb,
1556 struct netlink_callback *cb)
1558 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1559 const struct nft_af_info *afi;
1560 const struct nft_table *table;
1561 const struct nft_chain *chain;
1562 const struct nft_rule *rule;
1563 unsigned int idx = 0, s_idx = cb->args[0];
1564 struct net *net = sock_net(skb->sk);
1565 int family = nfmsg->nfgen_family;
1568 cb->seq = net->nft.base_seq;
1570 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1571 if (family != NFPROTO_UNSPEC && family != afi->family)
1574 list_for_each_entry_rcu(table, &afi->tables, list) {
1575 list_for_each_entry_rcu(chain, &table->chains, list) {
1576 list_for_each_entry_rcu(rule, &chain->rules, list) {
1577 if (!nft_rule_is_active(net, rule))
1582 memset(&cb->args[1], 0,
1583 sizeof(cb->args) - sizeof(cb->args[0]));
1584 if (nf_tables_fill_rule_info(skb, NETLINK_CB(cb->skb).portid,
1587 NLM_F_MULTI | NLM_F_APPEND,
1588 afi->family, table, chain, rule) < 0)
1591 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1605 static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
1606 const struct nlmsghdr *nlh,
1607 const struct nlattr * const nla[])
1609 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1610 const struct nft_af_info *afi;
1611 const struct nft_table *table;
1612 const struct nft_chain *chain;
1613 const struct nft_rule *rule;
1614 struct sk_buff *skb2;
1615 struct net *net = sock_net(skb->sk);
1616 int family = nfmsg->nfgen_family;
1619 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1620 struct netlink_dump_control c = {
1621 .dump = nf_tables_dump_rules,
1623 return netlink_dump_start(nlsk, skb, nlh, &c);
1626 afi = nf_tables_afinfo_lookup(net, family, false);
1628 return PTR_ERR(afi);
1630 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1632 return PTR_ERR(table);
1633 if (table->flags & NFT_TABLE_INACTIVE)
1636 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1638 return PTR_ERR(chain);
1639 if (chain->flags & NFT_CHAIN_INACTIVE)
1642 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1644 return PTR_ERR(rule);
1646 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1650 err = nf_tables_fill_rule_info(skb2, NETLINK_CB(skb).portid,
1651 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1652 family, table, chain, rule);
1656 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1663 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1664 struct nft_rule *rule)
1666 struct nft_expr *expr;
1669 * Careful: some expressions might not be initialized in case this
1670 * is called on error from nf_tables_newrule().
1672 expr = nft_expr_first(rule);
1673 while (expr->ops && expr != nft_expr_last(rule)) {
1674 nf_tables_expr_destroy(ctx, expr);
1675 expr = nft_expr_next(expr);
1680 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
1681 struct nft_rule *rule)
1683 struct nft_trans *trans;
1685 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
1689 nft_trans_rule(trans) = rule;
1690 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1695 #define NFT_RULE_MAXEXPRS 128
1697 static struct nft_expr_info *info;
1699 static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
1700 const struct nlmsghdr *nlh,
1701 const struct nlattr * const nla[])
1703 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1704 struct nft_af_info *afi;
1705 struct net *net = sock_net(skb->sk);
1706 struct nft_table *table;
1707 struct nft_chain *chain;
1708 struct nft_rule *rule, *old_rule = NULL;
1709 struct nft_trans *trans = NULL;
1710 struct nft_expr *expr;
1713 unsigned int size, i, n, ulen = 0;
1716 u64 handle, pos_handle;
1718 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1720 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
1722 return PTR_ERR(afi);
1724 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1726 return PTR_ERR(table);
1728 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1730 return PTR_ERR(chain);
1732 if (nla[NFTA_RULE_HANDLE]) {
1733 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
1734 rule = __nf_tables_rule_lookup(chain, handle);
1736 return PTR_ERR(rule);
1738 if (nlh->nlmsg_flags & NLM_F_EXCL)
1740 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1745 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
1747 handle = nf_tables_alloc_handle(table);
1749 if (chain->use == UINT_MAX)
1753 if (nla[NFTA_RULE_POSITION]) {
1754 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1757 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
1758 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
1759 if (IS_ERR(old_rule))
1760 return PTR_ERR(old_rule);
1763 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1767 if (nla[NFTA_RULE_EXPRESSIONS]) {
1768 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
1770 if (nla_type(tmp) != NFTA_LIST_ELEM)
1772 if (n == NFT_RULE_MAXEXPRS)
1774 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
1777 size += info[n].ops->size;
1782 if (nla[NFTA_RULE_USERDATA])
1783 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
1786 rule = kzalloc(sizeof(*rule) + size + ulen, GFP_KERNEL);
1790 nft_rule_activate_next(net, rule);
1792 rule->handle = handle;
1797 nla_memcpy(nft_userdata(rule), nla[NFTA_RULE_USERDATA], ulen);
1799 expr = nft_expr_first(rule);
1800 for (i = 0; i < n; i++) {
1801 err = nf_tables_newexpr(&ctx, &info[i], expr);
1805 expr = nft_expr_next(expr);
1808 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
1809 if (nft_rule_is_active_next(net, old_rule)) {
1810 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
1812 if (trans == NULL) {
1816 nft_rule_disactivate_next(net, old_rule);
1818 list_add_tail_rcu(&rule->list, &old_rule->list);
1823 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
1825 list_add_rcu(&rule->list, &old_rule->list);
1827 list_add_tail_rcu(&rule->list, &chain->rules);
1830 list_add_tail_rcu(&rule->list, &old_rule->list);
1832 list_add_rcu(&rule->list, &chain->rules);
1835 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
1843 list_del_rcu(&rule->list);
1845 list_del_rcu(&nft_trans_rule(trans)->list);
1846 nft_rule_clear(net, nft_trans_rule(trans));
1847 nft_trans_destroy(trans);
1851 nf_tables_rule_destroy(&ctx, rule);
1853 for (i = 0; i < n; i++) {
1854 if (info[i].ops != NULL)
1855 module_put(info[i].ops->type->owner);
1861 nf_tables_delrule_one(struct nft_ctx *ctx, struct nft_rule *rule)
1863 /* You cannot delete the same rule twice */
1864 if (nft_rule_is_active_next(ctx->net, rule)) {
1865 if (nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule) == NULL)
1867 nft_rule_disactivate_next(ctx->net, rule);
1874 static int nf_table_delrule_by_chain(struct nft_ctx *ctx)
1876 struct nft_rule *rule;
1879 list_for_each_entry(rule, &ctx->chain->rules, list) {
1880 err = nf_tables_delrule_one(ctx, rule);
1887 static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
1888 const struct nlmsghdr *nlh,
1889 const struct nlattr * const nla[])
1891 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1892 struct nft_af_info *afi;
1893 struct net *net = sock_net(skb->sk);
1894 struct nft_table *table;
1895 struct nft_chain *chain = NULL;
1896 struct nft_rule *rule;
1897 int family = nfmsg->nfgen_family, err = 0;
1900 afi = nf_tables_afinfo_lookup(net, family, false);
1902 return PTR_ERR(afi);
1904 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1906 return PTR_ERR(table);
1907 if (table->flags & NFT_TABLE_INACTIVE)
1910 if (nla[NFTA_RULE_CHAIN]) {
1911 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1913 return PTR_ERR(chain);
1916 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1919 if (nla[NFTA_RULE_HANDLE]) {
1920 rule = nf_tables_rule_lookup(chain,
1921 nla[NFTA_RULE_HANDLE]);
1923 return PTR_ERR(rule);
1925 err = nf_tables_delrule_one(&ctx, rule);
1927 err = nf_table_delrule_by_chain(&ctx);
1930 list_for_each_entry(chain, &table->chains, list) {
1932 err = nf_table_delrule_by_chain(&ctx);
1945 static LIST_HEAD(nf_tables_set_ops);
1947 int nft_register_set(struct nft_set_ops *ops)
1949 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1950 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
1951 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1954 EXPORT_SYMBOL_GPL(nft_register_set);
1956 void nft_unregister_set(struct nft_set_ops *ops)
1958 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1959 list_del_rcu(&ops->list);
1960 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1962 EXPORT_SYMBOL_GPL(nft_unregister_set);
1965 * Select a set implementation based on the data characteristics and the
1966 * given policy. The total memory use might not be known if no size is
1967 * given, in that case the amount of memory per element is used.
1969 static const struct nft_set_ops *
1970 nft_select_set_ops(const struct nlattr * const nla[],
1971 const struct nft_set_desc *desc,
1972 enum nft_set_policies policy)
1974 const struct nft_set_ops *ops, *bops;
1975 struct nft_set_estimate est, best;
1978 #ifdef CONFIG_MODULES
1979 if (list_empty(&nf_tables_set_ops)) {
1980 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1981 request_module("nft-set");
1982 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1983 if (!list_empty(&nf_tables_set_ops))
1984 return ERR_PTR(-EAGAIN);
1988 if (nla[NFTA_SET_FLAGS] != NULL) {
1989 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
1990 features &= NFT_SET_INTERVAL | NFT_SET_MAP;
1997 list_for_each_entry(ops, &nf_tables_set_ops, list) {
1998 if ((ops->features & features) != features)
2000 if (!ops->estimate(desc, features, &est))
2004 case NFT_SET_POL_PERFORMANCE:
2005 if (est.class < best.class)
2007 if (est.class == best.class && est.size < best.size)
2010 case NFT_SET_POL_MEMORY:
2011 if (est.size < best.size)
2013 if (est.size == best.size && est.class < best.class)
2020 if (!try_module_get(ops->owner))
2023 module_put(bops->owner);
2032 return ERR_PTR(-EOPNOTSUPP);
2035 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2036 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2037 [NFTA_SET_NAME] = { .type = NLA_STRING,
2038 .len = IFNAMSIZ - 1 },
2039 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2040 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2041 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2042 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2043 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2044 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2045 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2046 [NFTA_SET_ID] = { .type = NLA_U32 },
2049 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2050 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2053 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx,
2054 const struct sk_buff *skb,
2055 const struct nlmsghdr *nlh,
2056 const struct nlattr * const nla[])
2058 struct net *net = sock_net(skb->sk);
2059 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2060 struct nft_af_info *afi = NULL;
2061 struct nft_table *table = NULL;
2063 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2064 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2066 return PTR_ERR(afi);
2069 if (nla[NFTA_SET_TABLE] != NULL) {
2071 return -EAFNOSUPPORT;
2073 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2075 return PTR_ERR(table);
2076 if (table->flags & NFT_TABLE_INACTIVE)
2080 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2084 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2085 const struct nlattr *nla)
2087 struct nft_set *set;
2090 return ERR_PTR(-EINVAL);
2092 list_for_each_entry(set, &table->sets, list) {
2093 if (!nla_strcmp(nla, set->name))
2096 return ERR_PTR(-ENOENT);
2099 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2100 const struct nlattr *nla)
2102 struct nft_trans *trans;
2103 u32 id = ntohl(nla_get_be32(nla));
2105 list_for_each_entry(trans, &net->nft.commit_list, list) {
2106 if (trans->msg_type == NFT_MSG_NEWSET &&
2107 id == nft_trans_set_id(trans))
2108 return nft_trans_set(trans);
2110 return ERR_PTR(-ENOENT);
2113 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2116 const struct nft_set *i;
2118 unsigned long *inuse;
2119 unsigned int n = 0, min = 0;
2121 p = strnchr(name, IFNAMSIZ, '%');
2123 if (p[1] != 'd' || strchr(p + 2, '%'))
2126 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2130 list_for_each_entry(i, &ctx->table->sets, list) {
2133 if (!sscanf(i->name, name, &tmp))
2135 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2138 set_bit(tmp - min, inuse);
2141 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2142 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2143 min += BITS_PER_BYTE * PAGE_SIZE;
2144 memset(inuse, 0, PAGE_SIZE);
2147 free_page((unsigned long)inuse);
2150 snprintf(set->name, sizeof(set->name), name, min + n);
2151 list_for_each_entry(i, &ctx->table->sets, list) {
2152 if (!strcmp(set->name, i->name))
2158 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2159 const struct nft_set *set, u16 event, u16 flags)
2161 struct nfgenmsg *nfmsg;
2162 struct nlmsghdr *nlh;
2163 struct nlattr *desc;
2164 u32 portid = ctx->portid;
2167 event |= NFNL_SUBSYS_NFTABLES << 8;
2168 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2171 goto nla_put_failure;
2173 nfmsg = nlmsg_data(nlh);
2174 nfmsg->nfgen_family = ctx->afi->family;
2175 nfmsg->version = NFNETLINK_V0;
2178 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2179 goto nla_put_failure;
2180 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2181 goto nla_put_failure;
2182 if (set->flags != 0)
2183 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2184 goto nla_put_failure;
2186 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2187 goto nla_put_failure;
2188 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2189 goto nla_put_failure;
2190 if (set->flags & NFT_SET_MAP) {
2191 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2192 goto nla_put_failure;
2193 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2194 goto nla_put_failure;
2197 desc = nla_nest_start(skb, NFTA_SET_DESC);
2199 goto nla_put_failure;
2201 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2202 goto nla_put_failure;
2203 nla_nest_end(skb, desc);
2205 return nlmsg_end(skb, nlh);
2208 nlmsg_trim(skb, nlh);
2212 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2213 const struct nft_set *set,
2214 int event, gfp_t gfp_flags)
2216 struct sk_buff *skb;
2217 u32 portid = ctx->portid;
2221 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2225 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2229 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2235 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2236 ctx->report, gfp_flags);
2239 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2243 static int nf_tables_dump_sets_table(struct nft_ctx *ctx, struct sk_buff *skb,
2244 struct netlink_callback *cb)
2246 const struct nft_set *set;
2247 unsigned int idx = 0, s_idx = cb->args[0];
2253 cb->seq = ctx->net->nft.base_seq;
2255 list_for_each_entry_rcu(set, &ctx->table->sets, list) {
2258 if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET,
2263 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2273 static int nf_tables_dump_sets_family(struct nft_ctx *ctx, struct sk_buff *skb,
2274 struct netlink_callback *cb)
2276 const struct nft_set *set;
2277 unsigned int idx, s_idx = cb->args[0];
2278 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2284 cb->seq = ctx->net->nft.base_seq;
2286 list_for_each_entry_rcu(table, &ctx->afi->tables, list) {
2288 if (cur_table != table)
2295 list_for_each_entry_rcu(set, &ctx->table->sets, list) {
2298 if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET,
2301 cb->args[2] = (unsigned long) table;
2304 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2315 static int nf_tables_dump_sets_all(struct nft_ctx *ctx, struct sk_buff *skb,
2316 struct netlink_callback *cb)
2318 const struct nft_set *set;
2319 unsigned int idx, s_idx = cb->args[0];
2320 struct nft_af_info *afi;
2321 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2322 struct net *net = sock_net(skb->sk);
2323 int cur_family = cb->args[3];
2329 cb->seq = net->nft.base_seq;
2331 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2333 if (afi->family != cur_family)
2339 list_for_each_entry_rcu(table, &afi->tables, list) {
2341 if (cur_table != table)
2350 list_for_each_entry_rcu(set, &ctx->table->sets, list) {
2353 if (nf_tables_fill_set(skb, ctx, set,
2357 cb->args[2] = (unsigned long) table;
2358 cb->args[3] = afi->family;
2361 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2375 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2377 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2378 struct nlattr *nla[NFTA_SET_MAX + 1];
2382 err = nlmsg_parse(cb->nlh, sizeof(*nfmsg), nla, NFTA_SET_MAX,
2387 err = nft_ctx_init_from_setattr(&ctx, cb->skb, cb->nlh, (void *)nla);
2391 if (ctx.table == NULL) {
2392 if (ctx.afi == NULL)
2393 ret = nf_tables_dump_sets_all(&ctx, skb, cb);
2395 ret = nf_tables_dump_sets_family(&ctx, skb, cb);
2397 ret = nf_tables_dump_sets_table(&ctx, skb, cb);
2402 #define NFT_SET_INACTIVE (1 << 15) /* Internal set flag */
2404 static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
2405 const struct nlmsghdr *nlh,
2406 const struct nlattr * const nla[])
2408 const struct nft_set *set;
2410 struct sk_buff *skb2;
2411 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2414 /* Verify existance before starting dump */
2415 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2419 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2420 struct netlink_dump_control c = {
2421 .dump = nf_tables_dump_sets,
2423 return netlink_dump_start(nlsk, skb, nlh, &c);
2426 /* Only accept unspec with dump */
2427 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2428 return -EAFNOSUPPORT;
2430 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2432 return PTR_ERR(set);
2433 if (set->flags & NFT_SET_INACTIVE)
2436 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2440 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2444 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2451 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2452 struct nft_set_desc *desc,
2453 const struct nlattr *nla)
2455 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2458 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2462 if (da[NFTA_SET_DESC_SIZE] != NULL)
2463 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2468 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
2469 struct nft_set *set)
2471 struct nft_trans *trans;
2473 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
2477 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
2478 nft_trans_set_id(trans) =
2479 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
2480 set->flags |= NFT_SET_INACTIVE;
2482 nft_trans_set(trans) = set;
2483 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2488 static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
2489 const struct nlmsghdr *nlh,
2490 const struct nlattr * const nla[])
2492 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2493 const struct nft_set_ops *ops;
2494 struct nft_af_info *afi;
2495 struct net *net = sock_net(skb->sk);
2496 struct nft_table *table;
2497 struct nft_set *set;
2499 char name[IFNAMSIZ];
2502 u32 ktype, dtype, flags, policy;
2503 struct nft_set_desc desc;
2506 if (nla[NFTA_SET_TABLE] == NULL ||
2507 nla[NFTA_SET_NAME] == NULL ||
2508 nla[NFTA_SET_KEY_LEN] == NULL ||
2509 nla[NFTA_SET_ID] == NULL)
2512 memset(&desc, 0, sizeof(desc));
2514 ktype = NFT_DATA_VALUE;
2515 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2516 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2517 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2521 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2522 if (desc.klen == 0 || desc.klen > FIELD_SIZEOF(struct nft_data, data))
2526 if (nla[NFTA_SET_FLAGS] != NULL) {
2527 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2528 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2529 NFT_SET_INTERVAL | NFT_SET_MAP))
2534 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2535 if (!(flags & NFT_SET_MAP))
2538 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2539 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2540 dtype != NFT_DATA_VERDICT)
2543 if (dtype != NFT_DATA_VERDICT) {
2544 if (nla[NFTA_SET_DATA_LEN] == NULL)
2546 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2547 if (desc.dlen == 0 ||
2548 desc.dlen > FIELD_SIZEOF(struct nft_data, data))
2551 desc.dlen = sizeof(struct nft_data);
2552 } else if (flags & NFT_SET_MAP)
2555 policy = NFT_SET_POL_PERFORMANCE;
2556 if (nla[NFTA_SET_POLICY] != NULL)
2557 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2559 if (nla[NFTA_SET_DESC] != NULL) {
2560 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2565 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2567 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2569 return PTR_ERR(afi);
2571 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2573 return PTR_ERR(table);
2575 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
2577 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2579 if (PTR_ERR(set) != -ENOENT)
2580 return PTR_ERR(set);
2585 if (nlh->nlmsg_flags & NLM_F_EXCL)
2587 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2592 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2595 ops = nft_select_set_ops(nla, &desc, policy);
2597 return PTR_ERR(ops);
2600 if (ops->privsize != NULL)
2601 size = ops->privsize(nla);
2604 set = kzalloc(sizeof(*set) + size, GFP_KERNEL);
2608 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2609 err = nf_tables_set_alloc_name(&ctx, set, name);
2613 INIT_LIST_HEAD(&set->bindings);
2616 set->klen = desc.klen;
2618 set->dlen = desc.dlen;
2620 set->size = desc.size;
2622 err = ops->init(set, &desc, nla);
2626 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2630 list_add_tail_rcu(&set->list, &table->sets);
2637 module_put(ops->owner);
2641 static void nft_set_destroy(struct nft_set *set)
2643 set->ops->destroy(set);
2644 module_put(set->ops->owner);
2648 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2650 list_del_rcu(&set->list);
2651 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
2652 nft_set_destroy(set);
2655 static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
2656 const struct nlmsghdr *nlh,
2657 const struct nlattr * const nla[])
2659 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2660 struct nft_set *set;
2664 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2665 return -EAFNOSUPPORT;
2666 if (nla[NFTA_SET_TABLE] == NULL)
2669 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2673 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2675 return PTR_ERR(set);
2676 if (set->flags & NFT_SET_INACTIVE)
2678 if (!list_empty(&set->bindings))
2681 err = nft_trans_set_add(&ctx, NFT_MSG_DELSET, set);
2685 list_del_rcu(&set->list);
2690 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2691 const struct nft_set *set,
2692 const struct nft_set_iter *iter,
2693 const struct nft_set_elem *elem)
2695 enum nft_registers dreg;
2697 dreg = nft_type_to_reg(set->dtype);
2698 return nft_validate_data_load(ctx, dreg, &elem->data,
2699 set->dtype == NFT_DATA_VERDICT ?
2700 NFT_DATA_VERDICT : NFT_DATA_VALUE);
2703 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2704 struct nft_set_binding *binding)
2706 struct nft_set_binding *i;
2707 struct nft_set_iter iter;
2709 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2712 if (set->flags & NFT_SET_MAP) {
2713 /* If the set is already bound to the same chain all
2714 * jumps are already validated for that chain.
2716 list_for_each_entry(i, &set->bindings, list) {
2717 if (i->chain == binding->chain)
2724 iter.fn = nf_tables_bind_check_setelem;
2726 set->ops->walk(ctx, set, &iter);
2728 /* Destroy anonymous sets if binding fails */
2729 if (set->flags & NFT_SET_ANONYMOUS)
2730 nf_tables_set_destroy(ctx, set);
2736 binding->chain = ctx->chain;
2737 list_add_tail_rcu(&binding->list, &set->bindings);
2741 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2742 struct nft_set_binding *binding)
2744 list_del_rcu(&binding->list);
2746 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2747 !(set->flags & NFT_SET_INACTIVE))
2748 nf_tables_set_destroy(ctx, set);
2755 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
2756 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
2757 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
2758 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
2761 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
2762 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
2763 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
2764 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
2765 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
2768 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx,
2769 const struct sk_buff *skb,
2770 const struct nlmsghdr *nlh,
2771 const struct nlattr * const nla[],
2774 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2775 struct nft_af_info *afi;
2776 struct nft_table *table;
2777 struct net *net = sock_net(skb->sk);
2779 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2781 return PTR_ERR(afi);
2783 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
2785 return PTR_ERR(table);
2786 if (!trans && (table->flags & NFT_TABLE_INACTIVE))
2789 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2793 static int nf_tables_fill_setelem(struct sk_buff *skb,
2794 const struct nft_set *set,
2795 const struct nft_set_elem *elem)
2797 unsigned char *b = skb_tail_pointer(skb);
2798 struct nlattr *nest;
2800 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
2802 goto nla_put_failure;
2804 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE,
2806 goto nla_put_failure;
2808 if (set->flags & NFT_SET_MAP &&
2809 !(elem->flags & NFT_SET_ELEM_INTERVAL_END) &&
2810 nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data,
2811 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
2813 goto nla_put_failure;
2815 if (elem->flags != 0)
2816 if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags)))
2817 goto nla_put_failure;
2819 nla_nest_end(skb, nest);
2827 struct nft_set_dump_args {
2828 const struct netlink_callback *cb;
2829 struct nft_set_iter iter;
2830 struct sk_buff *skb;
2833 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
2834 const struct nft_set *set,
2835 const struct nft_set_iter *iter,
2836 const struct nft_set_elem *elem)
2838 struct nft_set_dump_args *args;
2840 args = container_of(iter, struct nft_set_dump_args, iter);
2841 return nf_tables_fill_setelem(args->skb, set, elem);
2844 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
2846 const struct nft_set *set;
2847 struct nft_set_dump_args args;
2849 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
2850 struct nfgenmsg *nfmsg;
2851 struct nlmsghdr *nlh;
2852 struct nlattr *nest;
2856 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
2857 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
2861 err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla,
2866 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2868 return PTR_ERR(set);
2869 if (set->flags & NFT_SET_INACTIVE)
2872 event = NFT_MSG_NEWSETELEM;
2873 event |= NFNL_SUBSYS_NFTABLES << 8;
2874 portid = NETLINK_CB(cb->skb).portid;
2875 seq = cb->nlh->nlmsg_seq;
2877 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2880 goto nla_put_failure;
2882 nfmsg = nlmsg_data(nlh);
2883 nfmsg->nfgen_family = ctx.afi->family;
2884 nfmsg->version = NFNETLINK_V0;
2887 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
2888 goto nla_put_failure;
2889 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
2890 goto nla_put_failure;
2892 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2894 goto nla_put_failure;
2898 args.iter.skip = cb->args[0];
2899 args.iter.count = 0;
2901 args.iter.fn = nf_tables_dump_setelem;
2902 set->ops->walk(&ctx, set, &args.iter);
2904 nla_nest_end(skb, nest);
2905 nlmsg_end(skb, nlh);
2907 if (args.iter.err && args.iter.err != -EMSGSIZE)
2908 return args.iter.err;
2909 if (args.iter.count == cb->args[0])
2912 cb->args[0] = args.iter.count;
2919 static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb,
2920 const struct nlmsghdr *nlh,
2921 const struct nlattr * const nla[])
2923 const struct nft_set *set;
2927 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
2931 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2933 return PTR_ERR(set);
2934 if (set->flags & NFT_SET_INACTIVE)
2937 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2938 struct netlink_dump_control c = {
2939 .dump = nf_tables_dump_set,
2941 return netlink_dump_start(nlsk, skb, nlh, &c);
2946 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
2947 const struct nft_ctx *ctx, u32 seq,
2948 u32 portid, int event, u16 flags,
2949 const struct nft_set *set,
2950 const struct nft_set_elem *elem)
2952 struct nfgenmsg *nfmsg;
2953 struct nlmsghdr *nlh;
2954 struct nlattr *nest;
2957 event |= NFNL_SUBSYS_NFTABLES << 8;
2958 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2961 goto nla_put_failure;
2963 nfmsg = nlmsg_data(nlh);
2964 nfmsg->nfgen_family = ctx->afi->family;
2965 nfmsg->version = NFNETLINK_V0;
2968 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2969 goto nla_put_failure;
2970 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2971 goto nla_put_failure;
2973 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2975 goto nla_put_failure;
2977 err = nf_tables_fill_setelem(skb, set, elem);
2979 goto nla_put_failure;
2981 nla_nest_end(skb, nest);
2983 return nlmsg_end(skb, nlh);
2986 nlmsg_trim(skb, nlh);
2990 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
2991 const struct nft_set *set,
2992 const struct nft_set_elem *elem,
2993 int event, u16 flags)
2995 struct net *net = ctx->net;
2996 u32 portid = ctx->portid;
2997 struct sk_buff *skb;
3000 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3004 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3008 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3015 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3019 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3023 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3025 struct nft_set *set)
3027 struct nft_trans *trans;
3029 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3033 nft_trans_elem_set(trans) = set;
3037 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3038 const struct nlattr *attr)
3040 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3041 struct nft_data_desc d1, d2;
3042 struct nft_set_elem elem;
3043 struct nft_set_binding *binding;
3044 enum nft_registers dreg;
3045 struct nft_trans *trans;
3048 if (set->size && set->nelems == set->size)
3051 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3052 nft_set_elem_policy);
3056 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3060 if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
3061 elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
3062 if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END)
3066 if (set->flags & NFT_SET_MAP) {
3067 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3068 !(elem.flags & NFT_SET_ELEM_INTERVAL_END))
3070 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3071 elem.flags & NFT_SET_ELEM_INTERVAL_END)
3074 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3078 err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]);
3082 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3086 if (set->ops->get(set, &elem) == 0)
3089 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3090 err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]);
3095 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3098 dreg = nft_type_to_reg(set->dtype);
3099 list_for_each_entry(binding, &set->bindings, list) {
3100 struct nft_ctx bind_ctx = {
3102 .table = ctx->table,
3103 .chain = (struct nft_chain *)binding->chain,
3106 err = nft_validate_data_load(&bind_ctx, dreg,
3107 &elem.data, d2.type);
3113 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3117 err = set->ops->insert(set, &elem);
3121 nft_trans_elem(trans) = elem;
3122 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3128 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3129 nft_data_uninit(&elem.data, d2.type);
3131 nft_data_uninit(&elem.key, d1.type);
3136 static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb,
3137 const struct nlmsghdr *nlh,
3138 const struct nlattr * const nla[])
3140 struct net *net = sock_net(skb->sk);
3141 const struct nlattr *attr;
3142 struct nft_set *set;
3146 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, true);
3150 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3152 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3153 set = nf_tables_set_lookup_byid(net,
3154 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3157 return PTR_ERR(set);
3160 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3163 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3164 err = nft_add_set_elem(&ctx, set, attr);
3173 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3174 const struct nlattr *attr)
3176 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3177 struct nft_data_desc desc;
3178 struct nft_set_elem elem;
3179 struct nft_trans *trans;
3182 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3183 nft_set_elem_policy);
3188 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3191 err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]);
3196 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3199 err = set->ops->get(set, &elem);
3203 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3207 nft_trans_elem(trans) = elem;
3208 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3210 nft_data_uninit(&elem.key, NFT_DATA_VALUE);
3211 if (set->flags & NFT_SET_MAP)
3212 nft_data_uninit(&elem.data, set->dtype);
3215 nft_data_uninit(&elem.key, desc.type);
3220 static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb,
3221 const struct nlmsghdr *nlh,
3222 const struct nlattr * const nla[])
3224 const struct nlattr *attr;
3225 struct nft_set *set;
3229 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
3233 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3235 return PTR_ERR(set);
3236 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3239 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3240 err = nft_del_setelem(&ctx, set, attr);
3249 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3250 [NFT_MSG_NEWTABLE] = {
3251 .call_batch = nf_tables_newtable,
3252 .attr_count = NFTA_TABLE_MAX,
3253 .policy = nft_table_policy,
3255 [NFT_MSG_GETTABLE] = {
3256 .call = nf_tables_gettable,
3257 .attr_count = NFTA_TABLE_MAX,
3258 .policy = nft_table_policy,
3260 [NFT_MSG_DELTABLE] = {
3261 .call_batch = nf_tables_deltable,
3262 .attr_count = NFTA_TABLE_MAX,
3263 .policy = nft_table_policy,
3265 [NFT_MSG_NEWCHAIN] = {
3266 .call_batch = nf_tables_newchain,
3267 .attr_count = NFTA_CHAIN_MAX,
3268 .policy = nft_chain_policy,
3270 [NFT_MSG_GETCHAIN] = {
3271 .call = nf_tables_getchain,
3272 .attr_count = NFTA_CHAIN_MAX,
3273 .policy = nft_chain_policy,
3275 [NFT_MSG_DELCHAIN] = {
3276 .call_batch = nf_tables_delchain,
3277 .attr_count = NFTA_CHAIN_MAX,
3278 .policy = nft_chain_policy,
3280 [NFT_MSG_NEWRULE] = {
3281 .call_batch = nf_tables_newrule,
3282 .attr_count = NFTA_RULE_MAX,
3283 .policy = nft_rule_policy,
3285 [NFT_MSG_GETRULE] = {
3286 .call = nf_tables_getrule,
3287 .attr_count = NFTA_RULE_MAX,
3288 .policy = nft_rule_policy,
3290 [NFT_MSG_DELRULE] = {
3291 .call_batch = nf_tables_delrule,
3292 .attr_count = NFTA_RULE_MAX,
3293 .policy = nft_rule_policy,
3295 [NFT_MSG_NEWSET] = {
3296 .call_batch = nf_tables_newset,
3297 .attr_count = NFTA_SET_MAX,
3298 .policy = nft_set_policy,
3300 [NFT_MSG_GETSET] = {
3301 .call = nf_tables_getset,
3302 .attr_count = NFTA_SET_MAX,
3303 .policy = nft_set_policy,
3305 [NFT_MSG_DELSET] = {
3306 .call_batch = nf_tables_delset,
3307 .attr_count = NFTA_SET_MAX,
3308 .policy = nft_set_policy,
3310 [NFT_MSG_NEWSETELEM] = {
3311 .call_batch = nf_tables_newsetelem,
3312 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3313 .policy = nft_set_elem_list_policy,
3315 [NFT_MSG_GETSETELEM] = {
3316 .call = nf_tables_getsetelem,
3317 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3318 .policy = nft_set_elem_list_policy,
3320 [NFT_MSG_DELSETELEM] = {
3321 .call_batch = nf_tables_delsetelem,
3322 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3323 .policy = nft_set_elem_list_policy,
3327 static void nft_chain_commit_update(struct nft_trans *trans)
3329 struct nft_base_chain *basechain;
3331 if (nft_trans_chain_name(trans)[0])
3332 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3334 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3337 basechain = nft_base_chain(trans->ctx.chain);
3338 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3340 switch (nft_trans_chain_policy(trans)) {
3343 basechain->policy = nft_trans_chain_policy(trans);
3348 /* Schedule objects for release via rcu to make sure no packets are accesing
3351 static void nf_tables_commit_release_rcu(struct rcu_head *rt)
3353 struct nft_trans *trans = container_of(rt, struct nft_trans, rcu_head);
3355 switch (trans->msg_type) {
3356 case NFT_MSG_DELTABLE:
3357 nf_tables_table_destroy(&trans->ctx);
3359 case NFT_MSG_DELCHAIN:
3360 nf_tables_chain_destroy(trans->ctx.chain);
3362 case NFT_MSG_DELRULE:
3363 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3365 case NFT_MSG_DELSET:
3366 nft_set_destroy(nft_trans_set(trans));
3372 static int nf_tables_commit(struct sk_buff *skb)
3374 struct net *net = sock_net(skb->sk);
3375 struct nft_trans *trans, *next;
3376 struct nft_set *set;
3378 /* Bump generation counter, invalidate any dump in progress */
3379 while (++net->nft.base_seq == 0);
3381 /* A new generation has just started */
3382 net->nft.gencursor = gencursor_next(net);
3384 /* Make sure all packets have left the previous generation before
3385 * purging old rules.
3389 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3390 switch (trans->msg_type) {
3391 case NFT_MSG_NEWTABLE:
3392 if (nft_trans_table_update(trans)) {
3393 if (!nft_trans_table_enable(trans)) {
3394 nf_tables_table_disable(trans->ctx.afi,
3396 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3399 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3401 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
3402 nft_trans_destroy(trans);
3404 case NFT_MSG_DELTABLE:
3405 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
3407 case NFT_MSG_NEWCHAIN:
3408 if (nft_trans_chain_update(trans))
3409 nft_chain_commit_update(trans);
3411 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
3413 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
3414 nft_trans_destroy(trans);
3416 case NFT_MSG_DELCHAIN:
3417 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
3418 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT) &&
3419 trans->ctx.chain->flags & NFT_BASE_CHAIN) {
3420 nf_unregister_hooks(nft_base_chain(trans->ctx.chain)->ops,
3421 trans->ctx.afi->nops);
3424 case NFT_MSG_NEWRULE:
3425 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3426 nf_tables_rule_notify(&trans->ctx,
3427 nft_trans_rule(trans),
3429 nft_trans_destroy(trans);
3431 case NFT_MSG_DELRULE:
3432 list_del_rcu(&nft_trans_rule(trans)->list);
3433 nf_tables_rule_notify(&trans->ctx,
3434 nft_trans_rule(trans),
3437 case NFT_MSG_NEWSET:
3438 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
3439 /* This avoids hitting -EBUSY when deleting the table
3440 * from the transaction.
3442 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
3443 !list_empty(&nft_trans_set(trans)->bindings))
3444 trans->ctx.table->use--;
3446 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3447 NFT_MSG_NEWSET, GFP_KERNEL);
3448 nft_trans_destroy(trans);
3450 case NFT_MSG_DELSET:
3451 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3452 NFT_MSG_DELSET, GFP_KERNEL);
3454 case NFT_MSG_NEWSETELEM:
3455 nf_tables_setelem_notify(&trans->ctx,
3456 nft_trans_elem_set(trans),
3457 &nft_trans_elem(trans),
3458 NFT_MSG_NEWSETELEM, 0);
3459 nft_trans_destroy(trans);
3461 case NFT_MSG_DELSETELEM:
3462 nf_tables_setelem_notify(&trans->ctx,
3463 nft_trans_elem_set(trans),
3464 &nft_trans_elem(trans),
3465 NFT_MSG_DELSETELEM, 0);
3466 set = nft_trans_elem_set(trans);
3467 set->ops->get(set, &nft_trans_elem(trans));
3468 set->ops->remove(set, &nft_trans_elem(trans));
3469 nft_trans_destroy(trans);
3474 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3475 list_del(&trans->list);
3476 trans->ctx.nla = NULL;
3477 call_rcu(&trans->rcu_head, nf_tables_commit_release_rcu);
3483 /* Schedule objects for release via rcu to make sure no packets are accesing
3486 static void nf_tables_abort_release_rcu(struct rcu_head *rt)
3488 struct nft_trans *trans = container_of(rt, struct nft_trans, rcu_head);
3490 switch (trans->msg_type) {
3491 case NFT_MSG_NEWTABLE:
3492 nf_tables_table_destroy(&trans->ctx);
3494 case NFT_MSG_NEWCHAIN:
3495 nf_tables_chain_destroy(trans->ctx.chain);
3497 case NFT_MSG_NEWRULE:
3498 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3500 case NFT_MSG_NEWSET:
3501 nft_set_destroy(nft_trans_set(trans));
3507 static int nf_tables_abort(struct sk_buff *skb)
3509 struct net *net = sock_net(skb->sk);
3510 struct nft_trans *trans, *next;
3511 struct nft_set *set;
3513 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3514 switch (trans->msg_type) {
3515 case NFT_MSG_NEWTABLE:
3516 if (nft_trans_table_update(trans)) {
3517 if (nft_trans_table_enable(trans)) {
3518 nf_tables_table_disable(trans->ctx.afi,
3520 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3522 nft_trans_destroy(trans);
3524 list_del_rcu(&trans->ctx.table->list);
3527 case NFT_MSG_DELTABLE:
3528 list_add_tail_rcu(&trans->ctx.table->list,
3529 &trans->ctx.afi->tables);
3530 nft_trans_destroy(trans);
3532 case NFT_MSG_NEWCHAIN:
3533 if (nft_trans_chain_update(trans)) {
3534 if (nft_trans_chain_stats(trans))
3535 free_percpu(nft_trans_chain_stats(trans));
3537 nft_trans_destroy(trans);
3539 trans->ctx.table->use--;
3540 list_del_rcu(&trans->ctx.chain->list);
3541 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT) &&
3542 trans->ctx.chain->flags & NFT_BASE_CHAIN) {
3543 nf_unregister_hooks(nft_base_chain(trans->ctx.chain)->ops,
3544 trans->ctx.afi->nops);
3548 case NFT_MSG_DELCHAIN:
3549 trans->ctx.table->use++;
3550 list_add_tail_rcu(&trans->ctx.chain->list,
3551 &trans->ctx.table->chains);
3552 nft_trans_destroy(trans);
3554 case NFT_MSG_NEWRULE:
3555 trans->ctx.chain->use--;
3556 list_del_rcu(&nft_trans_rule(trans)->list);
3558 case NFT_MSG_DELRULE:
3559 trans->ctx.chain->use++;
3560 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3561 nft_trans_destroy(trans);
3563 case NFT_MSG_NEWSET:
3564 trans->ctx.table->use--;
3565 list_del_rcu(&nft_trans_set(trans)->list);
3567 case NFT_MSG_DELSET:
3568 trans->ctx.table->use++;
3569 list_add_tail_rcu(&nft_trans_set(trans)->list,
3570 &trans->ctx.table->sets);
3571 nft_trans_destroy(trans);
3573 case NFT_MSG_NEWSETELEM:
3574 nft_trans_elem_set(trans)->nelems--;
3575 set = nft_trans_elem_set(trans);
3576 set->ops->get(set, &nft_trans_elem(trans));
3577 set->ops->remove(set, &nft_trans_elem(trans));
3578 nft_trans_destroy(trans);
3580 case NFT_MSG_DELSETELEM:
3581 nft_trans_elem_set(trans)->nelems++;
3582 nft_trans_destroy(trans);
3587 list_for_each_entry_safe_reverse(trans, next,
3588 &net->nft.commit_list, list) {
3589 list_del(&trans->list);
3590 trans->ctx.nla = NULL;
3591 call_rcu(&trans->rcu_head, nf_tables_abort_release_rcu);
3597 static const struct nfnetlink_subsystem nf_tables_subsys = {
3598 .name = "nf_tables",
3599 .subsys_id = NFNL_SUBSYS_NFTABLES,
3600 .cb_count = NFT_MSG_MAX,
3602 .commit = nf_tables_commit,
3603 .abort = nf_tables_abort,
3607 * Loop detection - walk through the ruleset beginning at the destination chain
3608 * of a new jump until either the source chain is reached (loop) or all
3609 * reachable chains have been traversed.
3611 * The loop check is performed whenever a new jump verdict is added to an
3612 * expression or verdict map or a verdict map is bound to a new chain.
3615 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3616 const struct nft_chain *chain);
3618 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
3619 const struct nft_set *set,
3620 const struct nft_set_iter *iter,
3621 const struct nft_set_elem *elem)
3623 if (elem->flags & NFT_SET_ELEM_INTERVAL_END)
3626 switch (elem->data.verdict) {
3629 return nf_tables_check_loops(ctx, elem->data.chain);
3635 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3636 const struct nft_chain *chain)
3638 const struct nft_rule *rule;
3639 const struct nft_expr *expr, *last;
3640 const struct nft_set *set;
3641 struct nft_set_binding *binding;
3642 struct nft_set_iter iter;
3644 if (ctx->chain == chain)
3647 list_for_each_entry(rule, &chain->rules, list) {
3648 nft_rule_for_each_expr(expr, last, rule) {
3649 const struct nft_data *data = NULL;
3652 if (!expr->ops->validate)
3655 err = expr->ops->validate(ctx, expr, &data);
3662 switch (data->verdict) {
3665 err = nf_tables_check_loops(ctx, data->chain);
3674 list_for_each_entry(set, &ctx->table->sets, list) {
3675 if (!(set->flags & NFT_SET_MAP) ||
3676 set->dtype != NFT_DATA_VERDICT)
3679 list_for_each_entry(binding, &set->bindings, list) {
3680 if (binding->chain != chain)
3686 iter.fn = nf_tables_loop_check_setelem;
3688 set->ops->walk(ctx, set, &iter);
3698 * nft_validate_input_register - validate an expressions' input register
3700 * @reg: the register number
3702 * Validate that the input register is one of the general purpose
3705 int nft_validate_input_register(enum nft_registers reg)
3707 if (reg <= NFT_REG_VERDICT)
3709 if (reg > NFT_REG_MAX)
3713 EXPORT_SYMBOL_GPL(nft_validate_input_register);
3716 * nft_validate_output_register - validate an expressions' output register
3718 * @reg: the register number
3720 * Validate that the output register is one of the general purpose
3721 * registers or the verdict register.
3723 int nft_validate_output_register(enum nft_registers reg)
3725 if (reg < NFT_REG_VERDICT)
3727 if (reg > NFT_REG_MAX)
3731 EXPORT_SYMBOL_GPL(nft_validate_output_register);
3734 * nft_validate_data_load - validate an expressions' data load
3736 * @ctx: context of the expression performing the load
3737 * @reg: the destination register number
3738 * @data: the data to load
3739 * @type: the data type
3741 * Validate that a data load uses the appropriate data type for
3742 * the destination register. A value of NULL for the data means
3743 * that its runtime gathered data, which is always of type
3746 int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg,
3747 const struct nft_data *data,
3748 enum nft_data_types type)
3753 case NFT_REG_VERDICT:
3754 if (data == NULL || type != NFT_DATA_VERDICT)
3757 if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) {
3758 err = nf_tables_check_loops(ctx, data->chain);
3762 if (ctx->chain->level + 1 > data->chain->level) {
3763 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
3765 data->chain->level = ctx->chain->level + 1;
3771 if (data != NULL && type != NFT_DATA_VALUE)
3776 EXPORT_SYMBOL_GPL(nft_validate_data_load);
3778 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
3779 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
3780 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
3781 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3784 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
3785 struct nft_data_desc *desc, const struct nlattr *nla)
3787 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
3788 struct nft_chain *chain;
3791 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
3795 if (!tb[NFTA_VERDICT_CODE])
3797 data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
3799 switch (data->verdict) {
3801 switch (data->verdict & NF_VERDICT_MASK) {
3813 desc->len = sizeof(data->verdict);
3817 if (!tb[NFTA_VERDICT_CHAIN])
3819 chain = nf_tables_chain_lookup(ctx->table,
3820 tb[NFTA_VERDICT_CHAIN]);
3822 return PTR_ERR(chain);
3823 if (chain->flags & NFT_BASE_CHAIN)
3827 data->chain = chain;
3828 desc->len = sizeof(data);
3832 desc->type = NFT_DATA_VERDICT;
3836 static void nft_verdict_uninit(const struct nft_data *data)
3838 switch (data->verdict) {
3846 static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data)
3848 struct nlattr *nest;
3850 nest = nla_nest_start(skb, NFTA_DATA_VERDICT);
3852 goto nla_put_failure;
3854 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict)))
3855 goto nla_put_failure;
3857 switch (data->verdict) {
3860 if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name))
3861 goto nla_put_failure;
3863 nla_nest_end(skb, nest);
3870 static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data,
3871 struct nft_data_desc *desc, const struct nlattr *nla)
3878 if (len > sizeof(data->data))
3881 nla_memcpy(data->data, nla, sizeof(data->data));
3882 desc->type = NFT_DATA_VALUE;
3887 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
3890 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
3893 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
3894 [NFTA_DATA_VALUE] = { .type = NLA_BINARY,
3895 .len = FIELD_SIZEOF(struct nft_data, data) },
3896 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
3900 * nft_data_init - parse nf_tables data netlink attributes
3902 * @ctx: context of the expression using the data
3903 * @data: destination struct nft_data
3904 * @desc: data description
3905 * @nla: netlink attribute containing data
3907 * Parse the netlink data attributes and initialize a struct nft_data.
3908 * The type and length of data are returned in the data description.
3910 * The caller can indicate that it only wants to accept data of type
3911 * NFT_DATA_VALUE by passing NULL for the ctx argument.
3913 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
3914 struct nft_data_desc *desc, const struct nlattr *nla)
3916 struct nlattr *tb[NFTA_DATA_MAX + 1];
3919 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
3923 if (tb[NFTA_DATA_VALUE])
3924 return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
3925 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
3926 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
3929 EXPORT_SYMBOL_GPL(nft_data_init);
3932 * nft_data_uninit - release a nft_data item
3934 * @data: struct nft_data to release
3935 * @type: type of data
3937 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
3938 * all others need to be released by calling this function.
3940 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
3943 case NFT_DATA_VALUE:
3945 case NFT_DATA_VERDICT:
3946 return nft_verdict_uninit(data);
3951 EXPORT_SYMBOL_GPL(nft_data_uninit);
3953 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
3954 enum nft_data_types type, unsigned int len)
3956 struct nlattr *nest;
3959 nest = nla_nest_start(skb, attr);
3964 case NFT_DATA_VALUE:
3965 err = nft_value_dump(skb, data, len);
3967 case NFT_DATA_VERDICT:
3968 err = nft_verdict_dump(skb, data);
3975 nla_nest_end(skb, nest);
3978 EXPORT_SYMBOL_GPL(nft_data_dump);
3980 static int nf_tables_init_net(struct net *net)
3982 INIT_LIST_HEAD(&net->nft.af_info);
3983 INIT_LIST_HEAD(&net->nft.commit_list);
3984 net->nft.base_seq = 1;
3988 static struct pernet_operations nf_tables_net_ops = {
3989 .init = nf_tables_init_net,
3992 static int __init nf_tables_module_init(void)
3996 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4003 err = nf_tables_core_module_init();
4007 err = nfnetlink_subsys_register(&nf_tables_subsys);
4011 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4012 return register_pernet_subsys(&nf_tables_net_ops);
4014 nf_tables_core_module_exit();
4021 static void __exit nf_tables_module_exit(void)
4023 unregister_pernet_subsys(&nf_tables_net_ops);
4024 nfnetlink_subsys_unregister(&nf_tables_subsys);
4025 nf_tables_core_module_exit();
4029 module_init(nf_tables_module_init);
4030 module_exit(nf_tables_module_exit);
4032 MODULE_LICENSE("GPL");
4033 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4034 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);