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(&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);
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);
95 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
96 const struct nlattr *nla)
98 struct nft_table *table;
100 list_for_each_entry(table, &afi->tables, list) {
101 if (!nla_strcmp(nla, table->name))
107 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
108 const struct nlattr *nla)
110 struct nft_table *table;
113 return ERR_PTR(-EINVAL);
115 table = nft_table_lookup(afi, nla);
119 return ERR_PTR(-ENOENT);
122 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
124 return ++table->hgenerator;
127 static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
129 static const struct nf_chain_type *
130 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
134 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
135 if (chain_type[family][i] != NULL &&
136 !nla_strcmp(nla, chain_type[family][i]->name))
137 return chain_type[family][i];
142 static const struct nf_chain_type *
143 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
144 const struct nlattr *nla,
147 const struct nf_chain_type *type;
149 type = __nf_tables_chain_type_lookup(afi->family, nla);
152 #ifdef CONFIG_MODULES
154 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
155 request_module("nft-chain-%u-%*.s", afi->family,
156 nla_len(nla)-1, (const char *)nla_data(nla));
157 nfnl_lock(NFNL_SUBSYS_NFTABLES);
158 type = __nf_tables_chain_type_lookup(afi->family, nla);
160 return ERR_PTR(-EAGAIN);
163 return ERR_PTR(-ENOENT);
166 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
167 [NFTA_TABLE_NAME] = { .type = NLA_STRING },
168 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
171 static int nf_tables_fill_table_info(struct sk_buff *skb, u32 portid, u32 seq,
172 int event, u32 flags, int family,
173 const struct nft_table *table)
175 struct nlmsghdr *nlh;
176 struct nfgenmsg *nfmsg;
178 event |= NFNL_SUBSYS_NFTABLES << 8;
179 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
181 goto nla_put_failure;
183 nfmsg = nlmsg_data(nlh);
184 nfmsg->nfgen_family = family;
185 nfmsg->version = NFNETLINK_V0;
188 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
189 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
190 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
191 goto nla_put_failure;
193 return nlmsg_end(skb, nlh);
196 nlmsg_trim(skb, nlh);
200 static int nf_tables_table_notify(const struct sk_buff *oskb,
201 const struct nlmsghdr *nlh,
202 const struct nft_table *table,
203 int event, int family)
206 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
207 u32 seq = nlh ? nlh->nlmsg_seq : 0;
208 struct net *net = oskb ? sock_net(oskb->sk) : &init_net;
212 report = nlh ? nlmsg_report(nlh) : false;
213 if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
217 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
221 err = nf_tables_fill_table_info(skb, portid, seq, event, 0,
228 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report,
232 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
236 static int nf_tables_dump_tables(struct sk_buff *skb,
237 struct netlink_callback *cb)
239 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
240 const struct nft_af_info *afi;
241 const struct nft_table *table;
242 unsigned int idx = 0, s_idx = cb->args[0];
243 struct net *net = sock_net(skb->sk);
244 int family = nfmsg->nfgen_family;
246 list_for_each_entry(afi, &net->nft.af_info, list) {
247 if (family != NFPROTO_UNSPEC && family != afi->family)
250 list_for_each_entry(table, &afi->tables, list) {
254 memset(&cb->args[1], 0,
255 sizeof(cb->args) - sizeof(cb->args[0]));
256 if (nf_tables_fill_table_info(skb,
257 NETLINK_CB(cb->skb).portid,
261 afi->family, table) < 0)
272 static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb,
273 const struct nlmsghdr *nlh,
274 const struct nlattr * const nla[])
276 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
277 const struct nft_af_info *afi;
278 const struct nft_table *table;
279 struct sk_buff *skb2;
280 struct net *net = sock_net(skb->sk);
281 int family = nfmsg->nfgen_family;
284 if (nlh->nlmsg_flags & NLM_F_DUMP) {
285 struct netlink_dump_control c = {
286 .dump = nf_tables_dump_tables,
288 return netlink_dump_start(nlsk, skb, nlh, &c);
291 afi = nf_tables_afinfo_lookup(net, family, false);
295 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
297 return PTR_ERR(table);
299 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
303 err = nf_tables_fill_table_info(skb2, NETLINK_CB(skb).portid,
304 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
309 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
316 static int nf_tables_table_enable(const struct nft_af_info *afi,
317 struct nft_table *table)
319 struct nft_chain *chain;
322 list_for_each_entry(chain, &table->chains, list) {
323 if (!(chain->flags & NFT_BASE_CHAIN))
326 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
334 list_for_each_entry(chain, &table->chains, list) {
335 if (!(chain->flags & NFT_BASE_CHAIN))
341 nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops);
346 static int nf_tables_table_disable(const struct nft_af_info *afi,
347 struct nft_table *table)
349 struct nft_chain *chain;
351 list_for_each_entry(chain, &table->chains, list) {
352 if (chain->flags & NFT_BASE_CHAIN)
353 nf_unregister_hooks(nft_base_chain(chain)->ops,
360 static int nf_tables_updtable(struct sock *nlsk, struct sk_buff *skb,
361 const struct nlmsghdr *nlh,
362 const struct nlattr * const nla[],
363 struct nft_af_info *afi, struct nft_table *table)
365 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
366 int family = nfmsg->nfgen_family, ret = 0;
368 if (nla[NFTA_TABLE_FLAGS]) {
371 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
372 if (flags & ~NFT_TABLE_F_DORMANT)
375 if ((flags & NFT_TABLE_F_DORMANT) &&
376 !(table->flags & NFT_TABLE_F_DORMANT)) {
377 ret = nf_tables_table_disable(afi, table);
379 table->flags |= NFT_TABLE_F_DORMANT;
380 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
381 table->flags & NFT_TABLE_F_DORMANT) {
382 ret = nf_tables_table_enable(afi, table);
384 table->flags &= ~NFT_TABLE_F_DORMANT;
390 nf_tables_table_notify(skb, nlh, table, NFT_MSG_NEWTABLE, family);
395 static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
396 const struct nlmsghdr *nlh,
397 const struct nlattr * const nla[])
399 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
400 const struct nlattr *name;
401 struct nft_af_info *afi;
402 struct nft_table *table;
403 struct net *net = sock_net(skb->sk);
404 int family = nfmsg->nfgen_family;
407 afi = nf_tables_afinfo_lookup(net, family, true);
411 name = nla[NFTA_TABLE_NAME];
412 table = nf_tables_table_lookup(afi, name);
414 if (PTR_ERR(table) != -ENOENT)
415 return PTR_ERR(table);
420 if (nlh->nlmsg_flags & NLM_F_EXCL)
422 if (nlh->nlmsg_flags & NLM_F_REPLACE)
424 return nf_tables_updtable(nlsk, skb, nlh, nla, afi, table);
427 if (nla[NFTA_TABLE_FLAGS]) {
428 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
429 if (flags & ~NFT_TABLE_F_DORMANT)
433 if (!try_module_get(afi->owner))
434 return -EAFNOSUPPORT;
436 table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL);
438 module_put(afi->owner);
442 nla_strlcpy(table->name, name, nla_len(name));
443 INIT_LIST_HEAD(&table->chains);
444 INIT_LIST_HEAD(&table->sets);
445 table->flags = flags;
447 list_add_tail(&table->list, &afi->tables);
448 nf_tables_table_notify(skb, nlh, table, NFT_MSG_NEWTABLE, family);
452 static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb,
453 const struct nlmsghdr *nlh,
454 const struct nlattr * const nla[])
456 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
457 struct nft_af_info *afi;
458 struct nft_table *table;
459 struct net *net = sock_net(skb->sk);
460 int family = nfmsg->nfgen_family;
462 afi = nf_tables_afinfo_lookup(net, family, false);
466 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
468 return PTR_ERR(table);
470 if (!list_empty(&table->chains) || !list_empty(&table->sets))
473 list_del(&table->list);
474 nf_tables_table_notify(skb, nlh, table, NFT_MSG_DELTABLE, family);
476 module_put(afi->owner);
480 int nft_register_chain_type(const struct nf_chain_type *ctype)
484 nfnl_lock(NFNL_SUBSYS_NFTABLES);
485 if (chain_type[ctype->family][ctype->type] != NULL) {
489 chain_type[ctype->family][ctype->type] = ctype;
491 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
494 EXPORT_SYMBOL_GPL(nft_register_chain_type);
496 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
498 nfnl_lock(NFNL_SUBSYS_NFTABLES);
499 chain_type[ctype->family][ctype->type] = NULL;
500 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
502 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
508 static struct nft_chain *
509 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
511 struct nft_chain *chain;
513 list_for_each_entry(chain, &table->chains, list) {
514 if (chain->handle == handle)
518 return ERR_PTR(-ENOENT);
521 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
522 const struct nlattr *nla)
524 struct nft_chain *chain;
527 return ERR_PTR(-EINVAL);
529 list_for_each_entry(chain, &table->chains, list) {
530 if (!nla_strcmp(nla, chain->name))
534 return ERR_PTR(-ENOENT);
537 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
538 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
539 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
540 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
541 .len = NFT_CHAIN_MAXNAMELEN - 1 },
542 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
543 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
544 [NFTA_CHAIN_TYPE] = { .type = NLA_NUL_STRING },
545 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
548 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
549 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
550 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
553 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
555 struct nft_stats *cpu_stats, total;
559 memset(&total, 0, sizeof(total));
560 for_each_possible_cpu(cpu) {
561 cpu_stats = per_cpu_ptr(stats, cpu);
562 total.pkts += cpu_stats->pkts;
563 total.bytes += cpu_stats->bytes;
565 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
567 goto nla_put_failure;
569 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) ||
570 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes)))
571 goto nla_put_failure;
573 nla_nest_end(skb, nest);
580 static int nf_tables_fill_chain_info(struct sk_buff *skb, u32 portid, u32 seq,
581 int event, u32 flags, int family,
582 const struct nft_table *table,
583 const struct nft_chain *chain)
585 struct nlmsghdr *nlh;
586 struct nfgenmsg *nfmsg;
588 event |= NFNL_SUBSYS_NFTABLES << 8;
589 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
591 goto nla_put_failure;
593 nfmsg = nlmsg_data(nlh);
594 nfmsg->nfgen_family = family;
595 nfmsg->version = NFNETLINK_V0;
598 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
599 goto nla_put_failure;
600 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle)))
601 goto nla_put_failure;
602 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
603 goto nla_put_failure;
605 if (chain->flags & NFT_BASE_CHAIN) {
606 const struct nft_base_chain *basechain = nft_base_chain(chain);
607 const struct nf_hook_ops *ops = &basechain->ops[0];
610 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
612 goto nla_put_failure;
613 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
614 goto nla_put_failure;
615 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
616 goto nla_put_failure;
617 nla_nest_end(skb, nest);
619 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
620 htonl(basechain->policy)))
621 goto nla_put_failure;
623 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
624 goto nla_put_failure;
626 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
627 goto nla_put_failure;
630 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
631 goto nla_put_failure;
633 return nlmsg_end(skb, nlh);
636 nlmsg_trim(skb, nlh);
640 static int nf_tables_chain_notify(const struct sk_buff *oskb,
641 const struct nlmsghdr *nlh,
642 const struct nft_table *table,
643 const struct nft_chain *chain,
644 int event, int family)
647 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
648 struct net *net = oskb ? sock_net(oskb->sk) : &init_net;
649 u32 seq = nlh ? nlh->nlmsg_seq : 0;
653 report = nlh ? nlmsg_report(nlh) : false;
654 if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
658 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
662 err = nf_tables_fill_chain_info(skb, portid, seq, event, 0, family,
669 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report,
673 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
677 static int nf_tables_dump_chains(struct sk_buff *skb,
678 struct netlink_callback *cb)
680 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
681 const struct nft_af_info *afi;
682 const struct nft_table *table;
683 const struct nft_chain *chain;
684 unsigned int idx = 0, s_idx = cb->args[0];
685 struct net *net = sock_net(skb->sk);
686 int family = nfmsg->nfgen_family;
688 list_for_each_entry(afi, &net->nft.af_info, list) {
689 if (family != NFPROTO_UNSPEC && family != afi->family)
692 list_for_each_entry(table, &afi->tables, list) {
693 list_for_each_entry(chain, &table->chains, list) {
697 memset(&cb->args[1], 0,
698 sizeof(cb->args) - sizeof(cb->args[0]));
699 if (nf_tables_fill_chain_info(skb, NETLINK_CB(cb->skb).portid,
703 afi->family, table, chain) < 0)
716 static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb,
717 const struct nlmsghdr *nlh,
718 const struct nlattr * const nla[])
720 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
721 const struct nft_af_info *afi;
722 const struct nft_table *table;
723 const struct nft_chain *chain;
724 struct sk_buff *skb2;
725 struct net *net = sock_net(skb->sk);
726 int family = nfmsg->nfgen_family;
729 if (nlh->nlmsg_flags & NLM_F_DUMP) {
730 struct netlink_dump_control c = {
731 .dump = nf_tables_dump_chains,
733 return netlink_dump_start(nlsk, skb, nlh, &c);
736 afi = nf_tables_afinfo_lookup(net, family, false);
740 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
742 return PTR_ERR(table);
744 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
746 return PTR_ERR(chain);
748 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
752 err = nf_tables_fill_chain_info(skb2, NETLINK_CB(skb).portid,
753 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
754 family, table, chain);
758 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
765 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
766 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
767 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
771 nf_tables_counters(struct nft_base_chain *chain, const struct nlattr *attr)
773 struct nlattr *tb[NFTA_COUNTER_MAX+1];
774 struct nft_stats __percpu *newstats;
775 struct nft_stats *stats;
778 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
782 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
785 newstats = alloc_percpu(struct nft_stats);
786 if (newstats == NULL)
789 /* Restore old counters on this cpu, no problem. Per-cpu statistics
790 * are not exposed to userspace.
792 stats = this_cpu_ptr(newstats);
793 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
794 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
797 /* nfnl_lock is held, add some nfnl function for this, later */
798 struct nft_stats __percpu *oldstats =
799 rcu_dereference_protected(chain->stats, 1);
801 rcu_assign_pointer(chain->stats, newstats);
803 free_percpu(oldstats);
805 rcu_assign_pointer(chain->stats, newstats);
810 static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
811 const struct nlmsghdr *nlh,
812 const struct nlattr * const nla[])
814 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
815 const struct nlattr * uninitialized_var(name);
816 const struct nft_af_info *afi;
817 struct nft_table *table;
818 struct nft_chain *chain;
819 struct nft_base_chain *basechain = NULL;
820 struct nlattr *ha[NFTA_HOOK_MAX + 1];
821 struct net *net = sock_net(skb->sk);
822 int family = nfmsg->nfgen_family;
823 u8 policy = NF_ACCEPT;
829 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
831 afi = nf_tables_afinfo_lookup(net, family, true);
835 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
837 return PTR_ERR(table);
840 name = nla[NFTA_CHAIN_NAME];
842 if (nla[NFTA_CHAIN_HANDLE]) {
843 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
844 chain = nf_tables_chain_lookup_byhandle(table, handle);
846 return PTR_ERR(chain);
848 chain = nf_tables_chain_lookup(table, name);
850 if (PTR_ERR(chain) != -ENOENT)
851 return PTR_ERR(chain);
856 if (nla[NFTA_CHAIN_POLICY]) {
857 if ((chain != NULL &&
858 !(chain->flags & NFT_BASE_CHAIN)) ||
859 nla[NFTA_CHAIN_HOOK] == NULL)
862 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
873 if (nlh->nlmsg_flags & NLM_F_EXCL)
875 if (nlh->nlmsg_flags & NLM_F_REPLACE)
878 if (nla[NFTA_CHAIN_HANDLE] && name &&
879 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
882 if (nla[NFTA_CHAIN_COUNTERS]) {
883 if (!(chain->flags & NFT_BASE_CHAIN))
886 err = nf_tables_counters(nft_base_chain(chain),
887 nla[NFTA_CHAIN_COUNTERS]);
892 if (nla[NFTA_CHAIN_POLICY])
893 nft_base_chain(chain)->policy = policy;
895 if (nla[NFTA_CHAIN_HANDLE] && name)
896 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
901 if (table->use == UINT_MAX)
904 if (nla[NFTA_CHAIN_HOOK]) {
905 const struct nf_chain_type *type;
906 struct nf_hook_ops *ops;
908 u32 hooknum, priority;
910 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
911 if (nla[NFTA_CHAIN_TYPE]) {
912 type = nf_tables_chain_type_lookup(afi,
913 nla[NFTA_CHAIN_TYPE],
916 return PTR_ERR(type);
919 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
923 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
924 ha[NFTA_HOOK_PRIORITY] == NULL)
927 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
928 if (hooknum >= afi->nhooks)
930 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
932 if (!(type->hook_mask & (1 << hooknum)))
934 if (!try_module_get(type->owner))
936 hookfn = type->hooks[hooknum];
938 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
939 if (basechain == NULL)
942 if (nla[NFTA_CHAIN_COUNTERS]) {
943 err = nf_tables_counters(basechain,
944 nla[NFTA_CHAIN_COUNTERS]);
946 module_put(type->owner);
951 struct nft_stats __percpu *newstats;
953 newstats = alloc_percpu(struct nft_stats);
954 if (newstats == NULL) {
955 module_put(type->owner);
959 rcu_assign_pointer(basechain->stats, newstats);
962 basechain->type = type;
963 chain = &basechain->chain;
965 for (i = 0; i < afi->nops; i++) {
966 ops = &basechain->ops[i];
968 ops->owner = afi->owner;
969 ops->hooknum = hooknum;
970 ops->priority = priority;
972 ops->hook = afi->hooks[ops->hooknum];
975 if (afi->hook_ops_init)
976 afi->hook_ops_init(ops, i);
979 chain->flags |= NFT_BASE_CHAIN;
980 basechain->policy = policy;
982 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
987 INIT_LIST_HEAD(&chain->rules);
988 chain->handle = nf_tables_alloc_handle(table);
990 chain->table = table;
991 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
993 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
994 chain->flags & NFT_BASE_CHAIN) {
995 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
997 module_put(basechain->type->owner);
998 free_percpu(basechain->stats);
1003 list_add_tail(&chain->list, &table->chains);
1006 nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_NEWCHAIN,
1011 static void nf_tables_chain_destroy(struct nft_chain *chain)
1013 BUG_ON(chain->use > 0);
1015 if (chain->flags & NFT_BASE_CHAIN) {
1016 module_put(nft_base_chain(chain)->type->owner);
1017 free_percpu(nft_base_chain(chain)->stats);
1018 kfree(nft_base_chain(chain));
1023 static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
1024 const struct nlmsghdr *nlh,
1025 const struct nlattr * const nla[])
1027 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1028 const struct nft_af_info *afi;
1029 struct nft_table *table;
1030 struct nft_chain *chain;
1031 struct net *net = sock_net(skb->sk);
1032 int family = nfmsg->nfgen_family;
1034 afi = nf_tables_afinfo_lookup(net, family, false);
1036 return PTR_ERR(afi);
1038 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1040 return PTR_ERR(table);
1042 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1044 return PTR_ERR(chain);
1046 if (!list_empty(&chain->rules) || chain->use > 0)
1049 list_del(&chain->list);
1052 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1053 chain->flags & NFT_BASE_CHAIN)
1054 nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops);
1056 nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_DELCHAIN,
1059 /* Make sure all rule references are gone before this is released */
1062 nf_tables_chain_destroy(chain);
1066 static void nft_ctx_init(struct nft_ctx *ctx,
1067 const struct sk_buff *skb,
1068 const struct nlmsghdr *nlh,
1069 const struct nft_af_info *afi,
1070 const struct nft_table *table,
1071 const struct nft_chain *chain,
1072 const struct nlattr * const *nla)
1074 ctx->net = sock_net(skb->sk);
1088 * nft_register_expr - register nf_tables expr type
1091 * Registers the expr type for use with nf_tables. Returns zero on
1092 * success or a negative errno code otherwise.
1094 int nft_register_expr(struct nft_expr_type *type)
1096 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1097 list_add_tail(&type->list, &nf_tables_expressions);
1098 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1101 EXPORT_SYMBOL_GPL(nft_register_expr);
1104 * nft_unregister_expr - unregister nf_tables expr type
1107 * Unregisters the expr typefor use with nf_tables.
1109 void nft_unregister_expr(struct nft_expr_type *type)
1111 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1112 list_del(&type->list);
1113 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1115 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1117 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1120 const struct nft_expr_type *type;
1122 list_for_each_entry(type, &nf_tables_expressions, list) {
1123 if (!nla_strcmp(nla, type->name) &&
1124 (!type->family || type->family == family))
1130 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1133 const struct nft_expr_type *type;
1136 return ERR_PTR(-EINVAL);
1138 type = __nft_expr_type_get(family, nla);
1139 if (type != NULL && try_module_get(type->owner))
1142 #ifdef CONFIG_MODULES
1144 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1145 request_module("nft-expr-%u-%.*s", family,
1146 nla_len(nla), (char *)nla_data(nla));
1147 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1148 if (__nft_expr_type_get(family, nla))
1149 return ERR_PTR(-EAGAIN);
1151 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1152 request_module("nft-expr-%.*s",
1153 nla_len(nla), (char *)nla_data(nla));
1154 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1155 if (__nft_expr_type_get(family, nla))
1156 return ERR_PTR(-EAGAIN);
1159 return ERR_PTR(-ENOENT);
1162 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1163 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1164 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1167 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1168 const struct nft_expr *expr)
1170 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1171 goto nla_put_failure;
1173 if (expr->ops->dump) {
1174 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1176 goto nla_put_failure;
1177 if (expr->ops->dump(skb, expr) < 0)
1178 goto nla_put_failure;
1179 nla_nest_end(skb, data);
1188 struct nft_expr_info {
1189 const struct nft_expr_ops *ops;
1190 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1193 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1194 const struct nlattr *nla,
1195 struct nft_expr_info *info)
1197 const struct nft_expr_type *type;
1198 const struct nft_expr_ops *ops;
1199 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1202 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1206 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1208 return PTR_ERR(type);
1210 if (tb[NFTA_EXPR_DATA]) {
1211 err = nla_parse_nested(info->tb, type->maxattr,
1212 tb[NFTA_EXPR_DATA], type->policy);
1216 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1218 if (type->select_ops != NULL) {
1219 ops = type->select_ops(ctx,
1220 (const struct nlattr * const *)info->tb);
1232 module_put(type->owner);
1236 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1237 const struct nft_expr_info *info,
1238 struct nft_expr *expr)
1240 const struct nft_expr_ops *ops = info->ops;
1245 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1257 static void nf_tables_expr_destroy(struct nft_expr *expr)
1259 if (expr->ops->destroy)
1260 expr->ops->destroy(expr);
1261 module_put(expr->ops->type->owner);
1268 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1271 struct nft_rule *rule;
1273 // FIXME: this sucks
1274 list_for_each_entry(rule, &chain->rules, list) {
1275 if (handle == rule->handle)
1279 return ERR_PTR(-ENOENT);
1282 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1283 const struct nlattr *nla)
1286 return ERR_PTR(-EINVAL);
1288 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1291 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1292 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1293 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1294 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1295 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1296 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1297 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1298 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1301 static int nf_tables_fill_rule_info(struct sk_buff *skb, u32 portid, u32 seq,
1302 int event, u32 flags, int family,
1303 const struct nft_table *table,
1304 const struct nft_chain *chain,
1305 const struct nft_rule *rule)
1307 struct nlmsghdr *nlh;
1308 struct nfgenmsg *nfmsg;
1309 const struct nft_expr *expr, *next;
1310 struct nlattr *list;
1311 const struct nft_rule *prule;
1312 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1314 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1317 goto nla_put_failure;
1319 nfmsg = nlmsg_data(nlh);
1320 nfmsg->nfgen_family = family;
1321 nfmsg->version = NFNETLINK_V0;
1324 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1325 goto nla_put_failure;
1326 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1327 goto nla_put_failure;
1328 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle)))
1329 goto nla_put_failure;
1331 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1332 prule = list_entry(rule->list.prev, struct nft_rule, list);
1333 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1334 cpu_to_be64(prule->handle)))
1335 goto nla_put_failure;
1338 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1340 goto nla_put_failure;
1341 nft_rule_for_each_expr(expr, next, rule) {
1342 struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM);
1344 goto nla_put_failure;
1345 if (nf_tables_fill_expr_info(skb, expr) < 0)
1346 goto nla_put_failure;
1347 nla_nest_end(skb, elem);
1349 nla_nest_end(skb, list);
1351 return nlmsg_end(skb, nlh);
1354 nlmsg_trim(skb, nlh);
1358 static int nf_tables_rule_notify(const struct sk_buff *oskb,
1359 const struct nlmsghdr *nlh,
1360 const struct nft_table *table,
1361 const struct nft_chain *chain,
1362 const struct nft_rule *rule,
1363 int event, u32 flags, int family)
1365 struct sk_buff *skb;
1366 u32 portid = NETLINK_CB(oskb).portid;
1367 struct net *net = oskb ? sock_net(oskb->sk) : &init_net;
1368 u32 seq = nlh->nlmsg_seq;
1372 report = nlmsg_report(nlh);
1373 if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
1377 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1381 err = nf_tables_fill_rule_info(skb, portid, seq, event, flags,
1382 family, table, chain, rule);
1388 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report,
1392 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
1397 nft_rule_is_active(struct net *net, const struct nft_rule *rule)
1399 return (rule->genmask & (1 << net->nft.gencursor)) == 0;
1402 static inline int gencursor_next(struct net *net)
1404 return net->nft.gencursor+1 == 1 ? 1 : 0;
1408 nft_rule_is_active_next(struct net *net, const struct nft_rule *rule)
1410 return (rule->genmask & (1 << gencursor_next(net))) == 0;
1414 nft_rule_activate_next(struct net *net, struct nft_rule *rule)
1416 /* Now inactive, will be active in the future */
1417 rule->genmask = (1 << net->nft.gencursor);
1421 nft_rule_disactivate_next(struct net *net, struct nft_rule *rule)
1423 rule->genmask = (1 << gencursor_next(net));
1426 static inline void nft_rule_clear(struct net *net, struct nft_rule *rule)
1431 static int nf_tables_dump_rules(struct sk_buff *skb,
1432 struct netlink_callback *cb)
1434 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1435 const struct nft_af_info *afi;
1436 const struct nft_table *table;
1437 const struct nft_chain *chain;
1438 const struct nft_rule *rule;
1439 unsigned int idx = 0, s_idx = cb->args[0];
1440 struct net *net = sock_net(skb->sk);
1441 int family = nfmsg->nfgen_family;
1442 u8 genctr = ACCESS_ONCE(net->nft.genctr);
1443 u8 gencursor = ACCESS_ONCE(net->nft.gencursor);
1445 list_for_each_entry(afi, &net->nft.af_info, list) {
1446 if (family != NFPROTO_UNSPEC && family != afi->family)
1449 list_for_each_entry(table, &afi->tables, list) {
1450 list_for_each_entry(chain, &table->chains, list) {
1451 list_for_each_entry(rule, &chain->rules, list) {
1452 if (!nft_rule_is_active(net, rule))
1457 memset(&cb->args[1], 0,
1458 sizeof(cb->args) - sizeof(cb->args[0]));
1459 if (nf_tables_fill_rule_info(skb, NETLINK_CB(cb->skb).portid,
1462 NLM_F_MULTI | NLM_F_APPEND,
1463 afi->family, table, chain, rule) < 0)
1472 /* Invalidate this dump, a transition to the new generation happened */
1473 if (gencursor != net->nft.gencursor || genctr != net->nft.genctr)
1480 static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
1481 const struct nlmsghdr *nlh,
1482 const struct nlattr * const nla[])
1484 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1485 const struct nft_af_info *afi;
1486 const struct nft_table *table;
1487 const struct nft_chain *chain;
1488 const struct nft_rule *rule;
1489 struct sk_buff *skb2;
1490 struct net *net = sock_net(skb->sk);
1491 int family = nfmsg->nfgen_family;
1494 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1495 struct netlink_dump_control c = {
1496 .dump = nf_tables_dump_rules,
1498 return netlink_dump_start(nlsk, skb, nlh, &c);
1501 afi = nf_tables_afinfo_lookup(net, family, false);
1503 return PTR_ERR(afi);
1505 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1507 return PTR_ERR(table);
1509 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1511 return PTR_ERR(chain);
1513 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1515 return PTR_ERR(rule);
1517 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1521 err = nf_tables_fill_rule_info(skb2, NETLINK_CB(skb).portid,
1522 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1523 family, table, chain, rule);
1527 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1534 static void nf_tables_rule_destroy(struct nft_rule *rule)
1536 struct nft_expr *expr;
1539 * Careful: some expressions might not be initialized in case this
1540 * is called on error from nf_tables_newrule().
1542 expr = nft_expr_first(rule);
1543 while (expr->ops && expr != nft_expr_last(rule)) {
1544 nf_tables_expr_destroy(expr);
1545 expr = nft_expr_next(expr);
1550 #define NFT_RULE_MAXEXPRS 128
1552 static struct nft_expr_info *info;
1554 static struct nft_rule_trans *
1555 nf_tables_trans_add(struct nft_rule *rule, const struct nft_ctx *ctx)
1557 struct nft_rule_trans *rupd;
1559 rupd = kmalloc(sizeof(struct nft_rule_trans), GFP_KERNEL);
1563 rupd->chain = ctx->chain;
1564 rupd->table = ctx->table;
1566 rupd->family = ctx->afi->family;
1567 rupd->nlh = ctx->nlh;
1568 list_add_tail(&rupd->list, &ctx->net->nft.commit_list);
1573 static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
1574 const struct nlmsghdr *nlh,
1575 const struct nlattr * const nla[])
1577 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1578 const struct nft_af_info *afi;
1579 struct net *net = sock_net(skb->sk);
1580 struct nft_table *table;
1581 struct nft_chain *chain;
1582 struct nft_rule *rule, *old_rule = NULL;
1583 struct nft_rule_trans *repl = NULL;
1584 struct nft_expr *expr;
1587 unsigned int size, i, n;
1590 u64 handle, pos_handle;
1592 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1594 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
1596 return PTR_ERR(afi);
1598 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1600 return PTR_ERR(table);
1602 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1604 return PTR_ERR(chain);
1606 if (nla[NFTA_RULE_HANDLE]) {
1607 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
1608 rule = __nf_tables_rule_lookup(chain, handle);
1610 return PTR_ERR(rule);
1612 if (nlh->nlmsg_flags & NLM_F_EXCL)
1614 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1619 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
1621 handle = nf_tables_alloc_handle(table);
1624 if (nla[NFTA_RULE_POSITION]) {
1625 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1628 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
1629 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
1630 if (IS_ERR(old_rule))
1631 return PTR_ERR(old_rule);
1634 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1638 if (nla[NFTA_RULE_EXPRESSIONS]) {
1639 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
1641 if (nla_type(tmp) != NFTA_LIST_ELEM)
1643 if (n == NFT_RULE_MAXEXPRS)
1645 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
1648 size += info[n].ops->size;
1654 rule = kzalloc(sizeof(*rule) + size, GFP_KERNEL);
1658 nft_rule_activate_next(net, rule);
1660 rule->handle = handle;
1663 expr = nft_expr_first(rule);
1664 for (i = 0; i < n; i++) {
1665 err = nf_tables_newexpr(&ctx, &info[i], expr);
1669 expr = nft_expr_next(expr);
1672 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
1673 if (nft_rule_is_active_next(net, old_rule)) {
1674 repl = nf_tables_trans_add(old_rule, &ctx);
1679 nft_rule_disactivate_next(net, old_rule);
1680 list_add_tail(&rule->list, &old_rule->list);
1685 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
1687 list_add_rcu(&rule->list, &old_rule->list);
1689 list_add_tail_rcu(&rule->list, &chain->rules);
1692 list_add_tail_rcu(&rule->list, &old_rule->list);
1694 list_add_rcu(&rule->list, &chain->rules);
1697 if (nf_tables_trans_add(rule, &ctx) == NULL) {
1704 list_del_rcu(&rule->list);
1706 list_del_rcu(&repl->rule->list);
1707 list_del(&repl->list);
1708 nft_rule_clear(net, repl->rule);
1712 nf_tables_rule_destroy(rule);
1714 for (i = 0; i < n; i++) {
1715 if (info[i].ops != NULL)
1716 module_put(info[i].ops->type->owner);
1722 nf_tables_delrule_one(struct nft_ctx *ctx, struct nft_rule *rule)
1724 /* You cannot delete the same rule twice */
1725 if (nft_rule_is_active_next(ctx->net, rule)) {
1726 if (nf_tables_trans_add(rule, ctx) == NULL)
1728 nft_rule_disactivate_next(ctx->net, rule);
1734 static int nf_table_delrule_by_chain(struct nft_ctx *ctx)
1736 struct nft_rule *rule;
1739 list_for_each_entry(rule, &ctx->chain->rules, list) {
1740 err = nf_tables_delrule_one(ctx, rule);
1747 static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
1748 const struct nlmsghdr *nlh,
1749 const struct nlattr * const nla[])
1751 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1752 const struct nft_af_info *afi;
1753 struct net *net = sock_net(skb->sk);
1754 const struct nft_table *table;
1755 struct nft_chain *chain = NULL;
1756 struct nft_rule *rule;
1757 int family = nfmsg->nfgen_family, err = 0;
1760 afi = nf_tables_afinfo_lookup(net, family, false);
1762 return PTR_ERR(afi);
1764 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1766 return PTR_ERR(table);
1768 if (nla[NFTA_RULE_CHAIN]) {
1769 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1771 return PTR_ERR(chain);
1774 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1777 if (nla[NFTA_RULE_HANDLE]) {
1778 rule = nf_tables_rule_lookup(chain,
1779 nla[NFTA_RULE_HANDLE]);
1781 return PTR_ERR(rule);
1783 err = nf_tables_delrule_one(&ctx, rule);
1785 err = nf_table_delrule_by_chain(&ctx);
1788 list_for_each_entry(chain, &table->chains, list) {
1790 err = nf_table_delrule_by_chain(&ctx);
1799 static int nf_tables_commit(struct sk_buff *skb)
1801 struct net *net = sock_net(skb->sk);
1802 struct nft_rule_trans *rupd, *tmp;
1804 /* Bump generation counter, invalidate any dump in progress */
1807 /* A new generation has just started */
1808 net->nft.gencursor = gencursor_next(net);
1810 /* Make sure all packets have left the previous generation before
1811 * purging old rules.
1815 list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) {
1816 /* This rule was inactive in the past and just became active.
1817 * Clear the next bit of the genmask since its meaning has
1818 * changed, now it is the future.
1820 if (nft_rule_is_active(net, rupd->rule)) {
1821 nft_rule_clear(net, rupd->rule);
1822 nf_tables_rule_notify(skb, rupd->nlh, rupd->table,
1823 rupd->chain, rupd->rule,
1826 list_del(&rupd->list);
1831 /* This rule is in the past, get rid of it */
1832 list_del_rcu(&rupd->rule->list);
1833 nf_tables_rule_notify(skb, rupd->nlh, rupd->table, rupd->chain,
1834 rupd->rule, NFT_MSG_DELRULE, 0,
1838 /* Make sure we don't see any packet traversing old rules */
1841 /* Now we can safely release unused old rules */
1842 list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) {
1843 nf_tables_rule_destroy(rupd->rule);
1844 list_del(&rupd->list);
1851 static int nf_tables_abort(struct sk_buff *skb)
1853 struct net *net = sock_net(skb->sk);
1854 struct nft_rule_trans *rupd, *tmp;
1856 list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) {
1857 if (!nft_rule_is_active_next(net, rupd->rule)) {
1858 nft_rule_clear(net, rupd->rule);
1859 list_del(&rupd->list);
1864 /* This rule is inactive, get rid of it */
1865 list_del_rcu(&rupd->rule->list);
1868 /* Make sure we don't see any packet accessing aborted rules */
1871 list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) {
1872 nf_tables_rule_destroy(rupd->rule);
1873 list_del(&rupd->list);
1884 static LIST_HEAD(nf_tables_set_ops);
1886 int nft_register_set(struct nft_set_ops *ops)
1888 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1889 list_add_tail(&ops->list, &nf_tables_set_ops);
1890 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1893 EXPORT_SYMBOL_GPL(nft_register_set);
1895 void nft_unregister_set(struct nft_set_ops *ops)
1897 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1898 list_del(&ops->list);
1899 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1901 EXPORT_SYMBOL_GPL(nft_unregister_set);
1903 static const struct nft_set_ops *nft_select_set_ops(const struct nlattr * const nla[])
1905 const struct nft_set_ops *ops;
1908 #ifdef CONFIG_MODULES
1909 if (list_empty(&nf_tables_set_ops)) {
1910 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1911 request_module("nft-set");
1912 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1913 if (!list_empty(&nf_tables_set_ops))
1914 return ERR_PTR(-EAGAIN);
1918 if (nla[NFTA_SET_FLAGS] != NULL) {
1919 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
1920 features &= NFT_SET_INTERVAL | NFT_SET_MAP;
1923 // FIXME: implement selection properly
1924 list_for_each_entry(ops, &nf_tables_set_ops, list) {
1925 if ((ops->features & features) != features)
1927 if (!try_module_get(ops->owner))
1932 return ERR_PTR(-EOPNOTSUPP);
1935 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
1936 [NFTA_SET_TABLE] = { .type = NLA_STRING },
1937 [NFTA_SET_NAME] = { .type = NLA_STRING },
1938 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
1939 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
1940 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
1941 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
1942 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
1945 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx,
1946 const struct sk_buff *skb,
1947 const struct nlmsghdr *nlh,
1948 const struct nlattr * const nla[])
1950 struct net *net = sock_net(skb->sk);
1951 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1952 const struct nft_af_info *afi = NULL;
1953 const struct nft_table *table = NULL;
1955 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
1956 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
1958 return PTR_ERR(afi);
1961 if (nla[NFTA_SET_TABLE] != NULL) {
1963 return -EAFNOSUPPORT;
1965 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
1967 return PTR_ERR(table);
1970 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
1974 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
1975 const struct nlattr *nla)
1977 struct nft_set *set;
1980 return ERR_PTR(-EINVAL);
1982 list_for_each_entry(set, &table->sets, list) {
1983 if (!nla_strcmp(nla, set->name))
1986 return ERR_PTR(-ENOENT);
1989 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
1992 const struct nft_set *i;
1994 unsigned long *inuse;
1997 p = strnchr(name, IFNAMSIZ, '%');
1999 if (p[1] != 'd' || strchr(p + 2, '%'))
2002 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2006 list_for_each_entry(i, &ctx->table->sets, list) {
2009 if (!sscanf(i->name, name, &tmp))
2011 if (tmp < 0 || tmp >= BITS_PER_BYTE * PAGE_SIZE)
2014 set_bit(tmp, inuse);
2017 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2018 free_page((unsigned long)inuse);
2021 snprintf(set->name, sizeof(set->name), name, n);
2022 list_for_each_entry(i, &ctx->table->sets, list) {
2023 if (!strcmp(set->name, i->name))
2029 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2030 const struct nft_set *set, u16 event, u16 flags)
2032 struct nfgenmsg *nfmsg;
2033 struct nlmsghdr *nlh;
2034 u32 portid = NETLINK_CB(ctx->skb).portid;
2035 u32 seq = ctx->nlh->nlmsg_seq;
2037 event |= NFNL_SUBSYS_NFTABLES << 8;
2038 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2041 goto nla_put_failure;
2043 nfmsg = nlmsg_data(nlh);
2044 nfmsg->nfgen_family = ctx->afi->family;
2045 nfmsg->version = NFNETLINK_V0;
2048 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2049 goto nla_put_failure;
2050 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2051 goto nla_put_failure;
2052 if (set->flags != 0)
2053 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2054 goto nla_put_failure;
2056 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2057 goto nla_put_failure;
2058 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2059 goto nla_put_failure;
2060 if (set->flags & NFT_SET_MAP) {
2061 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2062 goto nla_put_failure;
2063 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2064 goto nla_put_failure;
2067 return nlmsg_end(skb, nlh);
2070 nlmsg_trim(skb, nlh);
2074 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2075 const struct nft_set *set,
2078 struct sk_buff *skb;
2079 u32 portid = NETLINK_CB(ctx->skb).portid;
2083 report = nlmsg_report(ctx->nlh);
2084 if (!report && !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2088 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2092 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2098 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, report,
2102 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2106 static int nf_tables_dump_sets_table(struct nft_ctx *ctx, struct sk_buff *skb,
2107 struct netlink_callback *cb)
2109 const struct nft_set *set;
2110 unsigned int idx = 0, s_idx = cb->args[0];
2115 list_for_each_entry(set, &ctx->table->sets, list) {
2118 if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET,
2131 static int nf_tables_dump_sets_family(struct nft_ctx *ctx, struct sk_buff *skb,
2132 struct netlink_callback *cb)
2134 const struct nft_set *set;
2135 unsigned int idx, s_idx = cb->args[0];
2136 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2141 list_for_each_entry(table, &ctx->afi->tables, list) {
2143 if (cur_table != table)
2150 list_for_each_entry(set, &ctx->table->sets, list) {
2153 if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET,
2156 cb->args[2] = (unsigned long) table;
2168 static int nf_tables_dump_sets_all(struct nft_ctx *ctx, struct sk_buff *skb,
2169 struct netlink_callback *cb)
2171 const struct nft_set *set;
2172 unsigned int idx, s_idx = cb->args[0];
2173 const struct nft_af_info *afi;
2174 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2175 struct net *net = sock_net(skb->sk);
2176 int cur_family = cb->args[3];
2181 list_for_each_entry(afi, &net->nft.af_info, list) {
2183 if (afi->family != cur_family)
2189 list_for_each_entry(table, &afi->tables, list) {
2191 if (cur_table != table)
2200 list_for_each_entry(set, &ctx->table->sets, list) {
2203 if (nf_tables_fill_set(skb, ctx, set,
2207 cb->args[2] = (unsigned long) table;
2208 cb->args[3] = afi->family;
2223 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2225 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2226 struct nlattr *nla[NFTA_SET_MAX + 1];
2230 err = nlmsg_parse(cb->nlh, sizeof(*nfmsg), nla, NFTA_SET_MAX,
2235 err = nft_ctx_init_from_setattr(&ctx, cb->skb, cb->nlh, (void *)nla);
2239 if (ctx.table == NULL) {
2240 if (ctx.afi == NULL)
2241 ret = nf_tables_dump_sets_all(&ctx, skb, cb);
2243 ret = nf_tables_dump_sets_family(&ctx, skb, cb);
2245 ret = nf_tables_dump_sets_table(&ctx, skb, cb);
2250 static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
2251 const struct nlmsghdr *nlh,
2252 const struct nlattr * const nla[])
2254 const struct nft_set *set;
2256 struct sk_buff *skb2;
2257 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2260 /* Verify existance before starting dump */
2261 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2265 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2266 struct netlink_dump_control c = {
2267 .dump = nf_tables_dump_sets,
2269 return netlink_dump_start(nlsk, skb, nlh, &c);
2272 /* Only accept unspec with dump */
2273 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2274 return -EAFNOSUPPORT;
2276 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2278 return PTR_ERR(set);
2280 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2284 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2288 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2295 static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
2296 const struct nlmsghdr *nlh,
2297 const struct nlattr * const nla[])
2299 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2300 const struct nft_set_ops *ops;
2301 const struct nft_af_info *afi;
2302 struct net *net = sock_net(skb->sk);
2303 struct nft_table *table;
2304 struct nft_set *set;
2306 char name[IFNAMSIZ];
2309 u32 ktype, klen, dlen, dtype, flags;
2312 if (nla[NFTA_SET_TABLE] == NULL ||
2313 nla[NFTA_SET_NAME] == NULL ||
2314 nla[NFTA_SET_KEY_LEN] == NULL)
2317 ktype = NFT_DATA_VALUE;
2318 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2319 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2320 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2324 klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2325 if (klen == 0 || klen > FIELD_SIZEOF(struct nft_data, data))
2329 if (nla[NFTA_SET_FLAGS] != NULL) {
2330 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2331 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2332 NFT_SET_INTERVAL | NFT_SET_MAP))
2338 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2339 if (!(flags & NFT_SET_MAP))
2342 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2343 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2344 dtype != NFT_DATA_VERDICT)
2347 if (dtype != NFT_DATA_VERDICT) {
2348 if (nla[NFTA_SET_DATA_LEN] == NULL)
2350 dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2352 dlen > FIELD_SIZEOF(struct nft_data, data))
2355 dlen = sizeof(struct nft_data);
2356 } else if (flags & NFT_SET_MAP)
2359 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2361 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2363 return PTR_ERR(afi);
2365 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2367 return PTR_ERR(table);
2369 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
2371 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2373 if (PTR_ERR(set) != -ENOENT)
2374 return PTR_ERR(set);
2379 if (nlh->nlmsg_flags & NLM_F_EXCL)
2381 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2386 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2389 ops = nft_select_set_ops(nla);
2391 return PTR_ERR(ops);
2394 if (ops->privsize != NULL)
2395 size = ops->privsize(nla);
2398 set = kzalloc(sizeof(*set) + size, GFP_KERNEL);
2402 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2403 err = nf_tables_set_alloc_name(&ctx, set, name);
2407 INIT_LIST_HEAD(&set->bindings);
2415 err = ops->init(set, nla);
2419 list_add_tail(&set->list, &table->sets);
2420 nf_tables_set_notify(&ctx, set, NFT_MSG_NEWSET);
2426 module_put(ops->owner);
2430 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2432 list_del(&set->list);
2433 if (!(set->flags & NFT_SET_ANONYMOUS))
2434 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET);
2436 set->ops->destroy(set);
2437 module_put(set->ops->owner);
2441 static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
2442 const struct nlmsghdr *nlh,
2443 const struct nlattr * const nla[])
2445 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2446 struct nft_set *set;
2450 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2451 return -EAFNOSUPPORT;
2452 if (nla[NFTA_SET_TABLE] == NULL)
2455 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2459 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2461 return PTR_ERR(set);
2462 if (!list_empty(&set->bindings))
2465 nf_tables_set_destroy(&ctx, set);
2469 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2470 const struct nft_set *set,
2471 const struct nft_set_iter *iter,
2472 const struct nft_set_elem *elem)
2474 enum nft_registers dreg;
2476 dreg = nft_type_to_reg(set->dtype);
2477 return nft_validate_data_load(ctx, dreg, &elem->data,
2478 set->dtype == NFT_DATA_VERDICT ?
2479 NFT_DATA_VERDICT : NFT_DATA_VALUE);
2482 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2483 struct nft_set_binding *binding)
2485 struct nft_set_binding *i;
2486 struct nft_set_iter iter;
2488 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2491 if (set->flags & NFT_SET_MAP) {
2492 /* If the set is already bound to the same chain all
2493 * jumps are already validated for that chain.
2495 list_for_each_entry(i, &set->bindings, list) {
2496 if (i->chain == binding->chain)
2503 iter.fn = nf_tables_bind_check_setelem;
2505 set->ops->walk(ctx, set, &iter);
2507 /* Destroy anonymous sets if binding fails */
2508 if (set->flags & NFT_SET_ANONYMOUS)
2509 nf_tables_set_destroy(ctx, set);
2515 binding->chain = ctx->chain;
2516 list_add_tail(&binding->list, &set->bindings);
2520 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2521 struct nft_set_binding *binding)
2523 list_del(&binding->list);
2525 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2526 nf_tables_set_destroy(ctx, set);
2533 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
2534 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
2535 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
2536 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
2539 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
2540 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
2541 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
2542 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
2545 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx,
2546 const struct sk_buff *skb,
2547 const struct nlmsghdr *nlh,
2548 const struct nlattr * const nla[])
2550 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2551 const struct nft_af_info *afi;
2552 const struct nft_table *table;
2553 struct net *net = sock_net(skb->sk);
2555 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2557 return PTR_ERR(afi);
2559 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
2561 return PTR_ERR(table);
2563 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2567 static int nf_tables_fill_setelem(struct sk_buff *skb,
2568 const struct nft_set *set,
2569 const struct nft_set_elem *elem)
2571 unsigned char *b = skb_tail_pointer(skb);
2572 struct nlattr *nest;
2574 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
2576 goto nla_put_failure;
2578 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE,
2580 goto nla_put_failure;
2582 if (set->flags & NFT_SET_MAP &&
2583 !(elem->flags & NFT_SET_ELEM_INTERVAL_END) &&
2584 nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data,
2585 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
2587 goto nla_put_failure;
2589 if (elem->flags != 0)
2590 if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags)))
2591 goto nla_put_failure;
2593 nla_nest_end(skb, nest);
2601 struct nft_set_dump_args {
2602 const struct netlink_callback *cb;
2603 struct nft_set_iter iter;
2604 struct sk_buff *skb;
2607 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
2608 const struct nft_set *set,
2609 const struct nft_set_iter *iter,
2610 const struct nft_set_elem *elem)
2612 struct nft_set_dump_args *args;
2614 args = container_of(iter, struct nft_set_dump_args, iter);
2615 return nf_tables_fill_setelem(args->skb, set, elem);
2618 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
2620 const struct nft_set *set;
2621 struct nft_set_dump_args args;
2623 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
2624 struct nfgenmsg *nfmsg;
2625 struct nlmsghdr *nlh;
2626 struct nlattr *nest;
2630 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
2631 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
2635 err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla);
2639 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2641 return PTR_ERR(set);
2643 event = NFT_MSG_NEWSETELEM;
2644 event |= NFNL_SUBSYS_NFTABLES << 8;
2645 portid = NETLINK_CB(cb->skb).portid;
2646 seq = cb->nlh->nlmsg_seq;
2648 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2651 goto nla_put_failure;
2653 nfmsg = nlmsg_data(nlh);
2654 nfmsg->nfgen_family = NFPROTO_UNSPEC;
2655 nfmsg->version = NFNETLINK_V0;
2658 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
2659 goto nla_put_failure;
2660 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
2661 goto nla_put_failure;
2663 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2665 goto nla_put_failure;
2669 args.iter.skip = cb->args[0];
2670 args.iter.count = 0;
2672 args.iter.fn = nf_tables_dump_setelem;
2673 set->ops->walk(&ctx, set, &args.iter);
2675 nla_nest_end(skb, nest);
2676 nlmsg_end(skb, nlh);
2678 if (args.iter.err && args.iter.err != -EMSGSIZE)
2679 return args.iter.err;
2680 if (args.iter.count == cb->args[0])
2683 cb->args[0] = args.iter.count;
2690 static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb,
2691 const struct nlmsghdr *nlh,
2692 const struct nlattr * const nla[])
2694 const struct nft_set *set;
2698 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla);
2702 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2704 return PTR_ERR(set);
2706 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2707 struct netlink_dump_control c = {
2708 .dump = nf_tables_dump_set,
2710 return netlink_dump_start(nlsk, skb, nlh, &c);
2715 static int nft_add_set_elem(const struct nft_ctx *ctx, struct nft_set *set,
2716 const struct nlattr *attr)
2718 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
2719 struct nft_data_desc d1, d2;
2720 struct nft_set_elem elem;
2721 struct nft_set_binding *binding;
2722 enum nft_registers dreg;
2725 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
2726 nft_set_elem_policy);
2730 if (nla[NFTA_SET_ELEM_KEY] == NULL)
2734 if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
2735 elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
2736 if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END)
2740 if (set->flags & NFT_SET_MAP) {
2741 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
2742 !(elem.flags & NFT_SET_ELEM_INTERVAL_END))
2744 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
2745 elem.flags & NFT_SET_ELEM_INTERVAL_END)
2748 if (nla[NFTA_SET_ELEM_DATA] != NULL)
2752 err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]);
2756 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
2760 if (set->ops->get(set, &elem) == 0)
2763 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
2764 err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]);
2769 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
2772 dreg = nft_type_to_reg(set->dtype);
2773 list_for_each_entry(binding, &set->bindings, list) {
2774 struct nft_ctx bind_ctx = {
2776 .table = ctx->table,
2777 .chain = binding->chain,
2780 err = nft_validate_data_load(&bind_ctx, dreg,
2781 &elem.data, d2.type);
2787 err = set->ops->insert(set, &elem);
2794 if (nla[NFTA_SET_ELEM_DATA] != NULL)
2795 nft_data_uninit(&elem.data, d2.type);
2797 nft_data_uninit(&elem.key, d1.type);
2802 static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb,
2803 const struct nlmsghdr *nlh,
2804 const struct nlattr * const nla[])
2806 const struct nlattr *attr;
2807 struct nft_set *set;
2811 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla);
2815 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2817 return PTR_ERR(set);
2818 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
2821 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
2822 err = nft_add_set_elem(&ctx, set, attr);
2829 static int nft_del_setelem(const struct nft_ctx *ctx, struct nft_set *set,
2830 const struct nlattr *attr)
2832 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
2833 struct nft_data_desc desc;
2834 struct nft_set_elem elem;
2837 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
2838 nft_set_elem_policy);
2843 if (nla[NFTA_SET_ELEM_KEY] == NULL)
2846 err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]);
2851 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
2854 err = set->ops->get(set, &elem);
2858 set->ops->remove(set, &elem);
2860 nft_data_uninit(&elem.key, NFT_DATA_VALUE);
2861 if (set->flags & NFT_SET_MAP)
2862 nft_data_uninit(&elem.data, set->dtype);
2865 nft_data_uninit(&elem.key, desc.type);
2870 static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb,
2871 const struct nlmsghdr *nlh,
2872 const struct nlattr * const nla[])
2874 const struct nlattr *attr;
2875 struct nft_set *set;
2879 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla);
2883 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2885 return PTR_ERR(set);
2886 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
2889 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
2890 err = nft_del_setelem(&ctx, set, attr);
2897 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
2898 [NFT_MSG_NEWTABLE] = {
2899 .call = nf_tables_newtable,
2900 .attr_count = NFTA_TABLE_MAX,
2901 .policy = nft_table_policy,
2903 [NFT_MSG_GETTABLE] = {
2904 .call = nf_tables_gettable,
2905 .attr_count = NFTA_TABLE_MAX,
2906 .policy = nft_table_policy,
2908 [NFT_MSG_DELTABLE] = {
2909 .call = nf_tables_deltable,
2910 .attr_count = NFTA_TABLE_MAX,
2911 .policy = nft_table_policy,
2913 [NFT_MSG_NEWCHAIN] = {
2914 .call = nf_tables_newchain,
2915 .attr_count = NFTA_CHAIN_MAX,
2916 .policy = nft_chain_policy,
2918 [NFT_MSG_GETCHAIN] = {
2919 .call = nf_tables_getchain,
2920 .attr_count = NFTA_CHAIN_MAX,
2921 .policy = nft_chain_policy,
2923 [NFT_MSG_DELCHAIN] = {
2924 .call = nf_tables_delchain,
2925 .attr_count = NFTA_CHAIN_MAX,
2926 .policy = nft_chain_policy,
2928 [NFT_MSG_NEWRULE] = {
2929 .call_batch = nf_tables_newrule,
2930 .attr_count = NFTA_RULE_MAX,
2931 .policy = nft_rule_policy,
2933 [NFT_MSG_GETRULE] = {
2934 .call = nf_tables_getrule,
2935 .attr_count = NFTA_RULE_MAX,
2936 .policy = nft_rule_policy,
2938 [NFT_MSG_DELRULE] = {
2939 .call_batch = nf_tables_delrule,
2940 .attr_count = NFTA_RULE_MAX,
2941 .policy = nft_rule_policy,
2943 [NFT_MSG_NEWSET] = {
2944 .call = nf_tables_newset,
2945 .attr_count = NFTA_SET_MAX,
2946 .policy = nft_set_policy,
2948 [NFT_MSG_GETSET] = {
2949 .call = nf_tables_getset,
2950 .attr_count = NFTA_SET_MAX,
2951 .policy = nft_set_policy,
2953 [NFT_MSG_DELSET] = {
2954 .call = nf_tables_delset,
2955 .attr_count = NFTA_SET_MAX,
2956 .policy = nft_set_policy,
2958 [NFT_MSG_NEWSETELEM] = {
2959 .call = nf_tables_newsetelem,
2960 .attr_count = NFTA_SET_ELEM_LIST_MAX,
2961 .policy = nft_set_elem_list_policy,
2963 [NFT_MSG_GETSETELEM] = {
2964 .call = nf_tables_getsetelem,
2965 .attr_count = NFTA_SET_ELEM_LIST_MAX,
2966 .policy = nft_set_elem_list_policy,
2968 [NFT_MSG_DELSETELEM] = {
2969 .call = nf_tables_delsetelem,
2970 .attr_count = NFTA_SET_ELEM_LIST_MAX,
2971 .policy = nft_set_elem_list_policy,
2975 static const struct nfnetlink_subsystem nf_tables_subsys = {
2976 .name = "nf_tables",
2977 .subsys_id = NFNL_SUBSYS_NFTABLES,
2978 .cb_count = NFT_MSG_MAX,
2980 .commit = nf_tables_commit,
2981 .abort = nf_tables_abort,
2985 * Loop detection - walk through the ruleset beginning at the destination chain
2986 * of a new jump until either the source chain is reached (loop) or all
2987 * reachable chains have been traversed.
2989 * The loop check is performed whenever a new jump verdict is added to an
2990 * expression or verdict map or a verdict map is bound to a new chain.
2993 static int nf_tables_check_loops(const struct nft_ctx *ctx,
2994 const struct nft_chain *chain);
2996 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
2997 const struct nft_set *set,
2998 const struct nft_set_iter *iter,
2999 const struct nft_set_elem *elem)
3001 if (elem->flags & NFT_SET_ELEM_INTERVAL_END)
3004 switch (elem->data.verdict) {
3007 return nf_tables_check_loops(ctx, elem->data.chain);
3013 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3014 const struct nft_chain *chain)
3016 const struct nft_rule *rule;
3017 const struct nft_expr *expr, *last;
3018 const struct nft_set *set;
3019 struct nft_set_binding *binding;
3020 struct nft_set_iter iter;
3022 if (ctx->chain == chain)
3025 list_for_each_entry(rule, &chain->rules, list) {
3026 nft_rule_for_each_expr(expr, last, rule) {
3027 const struct nft_data *data = NULL;
3030 if (!expr->ops->validate)
3033 err = expr->ops->validate(ctx, expr, &data);
3040 switch (data->verdict) {
3043 err = nf_tables_check_loops(ctx, data->chain);
3052 list_for_each_entry(set, &ctx->table->sets, list) {
3053 if (!(set->flags & NFT_SET_MAP) ||
3054 set->dtype != NFT_DATA_VERDICT)
3057 list_for_each_entry(binding, &set->bindings, list) {
3058 if (binding->chain != chain)
3064 iter.fn = nf_tables_loop_check_setelem;
3066 set->ops->walk(ctx, set, &iter);
3076 * nft_validate_input_register - validate an expressions' input register
3078 * @reg: the register number
3080 * Validate that the input register is one of the general purpose
3083 int nft_validate_input_register(enum nft_registers reg)
3085 if (reg <= NFT_REG_VERDICT)
3087 if (reg > NFT_REG_MAX)
3091 EXPORT_SYMBOL_GPL(nft_validate_input_register);
3094 * nft_validate_output_register - validate an expressions' output register
3096 * @reg: the register number
3098 * Validate that the output register is one of the general purpose
3099 * registers or the verdict register.
3101 int nft_validate_output_register(enum nft_registers reg)
3103 if (reg < NFT_REG_VERDICT)
3105 if (reg > NFT_REG_MAX)
3109 EXPORT_SYMBOL_GPL(nft_validate_output_register);
3112 * nft_validate_data_load - validate an expressions' data load
3114 * @ctx: context of the expression performing the load
3115 * @reg: the destination register number
3116 * @data: the data to load
3117 * @type: the data type
3119 * Validate that a data load uses the appropriate data type for
3120 * the destination register. A value of NULL for the data means
3121 * that its runtime gathered data, which is always of type
3124 int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg,
3125 const struct nft_data *data,
3126 enum nft_data_types type)
3131 case NFT_REG_VERDICT:
3132 if (data == NULL || type != NFT_DATA_VERDICT)
3135 if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) {
3136 err = nf_tables_check_loops(ctx, data->chain);
3140 if (ctx->chain->level + 1 > data->chain->level) {
3141 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
3143 data->chain->level = ctx->chain->level + 1;
3149 if (data != NULL && type != NFT_DATA_VALUE)
3154 EXPORT_SYMBOL_GPL(nft_validate_data_load);
3156 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
3157 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
3158 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
3159 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3162 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
3163 struct nft_data_desc *desc, const struct nlattr *nla)
3165 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
3166 struct nft_chain *chain;
3169 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
3173 if (!tb[NFTA_VERDICT_CODE])
3175 data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
3177 switch (data->verdict) {
3184 desc->len = sizeof(data->verdict);
3188 if (!tb[NFTA_VERDICT_CHAIN])
3190 chain = nf_tables_chain_lookup(ctx->table,
3191 tb[NFTA_VERDICT_CHAIN]);
3193 return PTR_ERR(chain);
3194 if (chain->flags & NFT_BASE_CHAIN)
3198 data->chain = chain;
3199 desc->len = sizeof(data);
3205 desc->type = NFT_DATA_VERDICT;
3209 static void nft_verdict_uninit(const struct nft_data *data)
3211 switch (data->verdict) {
3219 static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data)
3221 struct nlattr *nest;
3223 nest = nla_nest_start(skb, NFTA_DATA_VERDICT);
3225 goto nla_put_failure;
3227 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict)))
3228 goto nla_put_failure;
3230 switch (data->verdict) {
3233 if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name))
3234 goto nla_put_failure;
3236 nla_nest_end(skb, nest);
3243 static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data,
3244 struct nft_data_desc *desc, const struct nlattr *nla)
3251 if (len > sizeof(data->data))
3254 nla_memcpy(data->data, nla, sizeof(data->data));
3255 desc->type = NFT_DATA_VALUE;
3260 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
3263 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
3266 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
3267 [NFTA_DATA_VALUE] = { .type = NLA_BINARY,
3268 .len = FIELD_SIZEOF(struct nft_data, data) },
3269 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
3273 * nft_data_init - parse nf_tables data netlink attributes
3275 * @ctx: context of the expression using the data
3276 * @data: destination struct nft_data
3277 * @desc: data description
3278 * @nla: netlink attribute containing data
3280 * Parse the netlink data attributes and initialize a struct nft_data.
3281 * The type and length of data are returned in the data description.
3283 * The caller can indicate that it only wants to accept data of type
3284 * NFT_DATA_VALUE by passing NULL for the ctx argument.
3286 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
3287 struct nft_data_desc *desc, const struct nlattr *nla)
3289 struct nlattr *tb[NFTA_DATA_MAX + 1];
3292 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
3296 if (tb[NFTA_DATA_VALUE])
3297 return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
3298 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
3299 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
3302 EXPORT_SYMBOL_GPL(nft_data_init);
3305 * nft_data_uninit - release a nft_data item
3307 * @data: struct nft_data to release
3308 * @type: type of data
3310 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
3311 * all others need to be released by calling this function.
3313 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
3316 case NFT_DATA_VALUE:
3318 case NFT_DATA_VERDICT:
3319 return nft_verdict_uninit(data);
3324 EXPORT_SYMBOL_GPL(nft_data_uninit);
3326 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
3327 enum nft_data_types type, unsigned int len)
3329 struct nlattr *nest;
3332 nest = nla_nest_start(skb, attr);
3337 case NFT_DATA_VALUE:
3338 err = nft_value_dump(skb, data, len);
3340 case NFT_DATA_VERDICT:
3341 err = nft_verdict_dump(skb, data);
3348 nla_nest_end(skb, nest);
3351 EXPORT_SYMBOL_GPL(nft_data_dump);
3353 static int nf_tables_init_net(struct net *net)
3355 INIT_LIST_HEAD(&net->nft.af_info);
3356 INIT_LIST_HEAD(&net->nft.commit_list);
3360 static struct pernet_operations nf_tables_net_ops = {
3361 .init = nf_tables_init_net,
3364 static int __init nf_tables_module_init(void)
3368 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
3375 err = nf_tables_core_module_init();
3379 err = nfnetlink_subsys_register(&nf_tables_subsys);
3383 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
3384 return register_pernet_subsys(&nf_tables_net_ops);
3386 nf_tables_core_module_exit();
3393 static void __exit nf_tables_module_exit(void)
3395 unregister_pernet_subsys(&nf_tables_net_ops);
3396 nfnetlink_subsys_unregister(&nf_tables_subsys);
3397 nf_tables_core_module_exit();
3401 module_init(nf_tables_module_init);
3402 module_exit(nf_tables_module_exit);
3404 MODULE_LICENSE("GPL");
3405 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
3406 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);