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);
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);
108 static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type,
111 struct nft_trans *trans;
113 trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL);
117 trans->msg_type = msg_type;
123 static void nft_trans_destroy(struct nft_trans *trans)
125 list_del(&trans->list);
133 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
134 const struct nlattr *nla)
136 struct nft_table *table;
138 list_for_each_entry(table, &afi->tables, list) {
139 if (!nla_strcmp(nla, table->name))
145 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
146 const struct nlattr *nla)
148 struct nft_table *table;
151 return ERR_PTR(-EINVAL);
153 table = nft_table_lookup(afi, nla);
157 return ERR_PTR(-ENOENT);
160 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
162 return ++table->hgenerator;
165 static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
167 static const struct nf_chain_type *
168 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
172 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
173 if (chain_type[family][i] != NULL &&
174 !nla_strcmp(nla, chain_type[family][i]->name))
175 return chain_type[family][i];
180 static const struct nf_chain_type *
181 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
182 const struct nlattr *nla,
185 const struct nf_chain_type *type;
187 type = __nf_tables_chain_type_lookup(afi->family, nla);
190 #ifdef CONFIG_MODULES
192 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
193 request_module("nft-chain-%u-%*.s", afi->family,
194 nla_len(nla)-1, (const char *)nla_data(nla));
195 nfnl_lock(NFNL_SUBSYS_NFTABLES);
196 type = __nf_tables_chain_type_lookup(afi->family, nla);
198 return ERR_PTR(-EAGAIN);
201 return ERR_PTR(-ENOENT);
204 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
205 [NFTA_TABLE_NAME] = { .type = NLA_STRING },
206 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
209 static int nf_tables_fill_table_info(struct sk_buff *skb, u32 portid, u32 seq,
210 int event, u32 flags, int family,
211 const struct nft_table *table)
213 struct nlmsghdr *nlh;
214 struct nfgenmsg *nfmsg;
216 event |= NFNL_SUBSYS_NFTABLES << 8;
217 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
219 goto nla_put_failure;
221 nfmsg = nlmsg_data(nlh);
222 nfmsg->nfgen_family = family;
223 nfmsg->version = NFNETLINK_V0;
226 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
227 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
228 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
229 goto nla_put_failure;
231 return nlmsg_end(skb, nlh);
234 nlmsg_trim(skb, nlh);
238 static int nf_tables_table_notify(const struct sk_buff *oskb,
239 const struct nlmsghdr *nlh,
240 const struct nft_table *table,
241 int event, int family)
244 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
245 u32 seq = nlh ? nlh->nlmsg_seq : 0;
246 struct net *net = oskb ? sock_net(oskb->sk) : &init_net;
250 report = nlh ? nlmsg_report(nlh) : false;
251 if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
255 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
259 err = nf_tables_fill_table_info(skb, portid, seq, event, 0,
266 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report,
270 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
274 static int nf_tables_dump_tables(struct sk_buff *skb,
275 struct netlink_callback *cb)
277 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
278 const struct nft_af_info *afi;
279 const struct nft_table *table;
280 unsigned int idx = 0, s_idx = cb->args[0];
281 struct net *net = sock_net(skb->sk);
282 int family = nfmsg->nfgen_family;
284 list_for_each_entry(afi, &net->nft.af_info, list) {
285 if (family != NFPROTO_UNSPEC && family != afi->family)
288 list_for_each_entry(table, &afi->tables, list) {
292 memset(&cb->args[1], 0,
293 sizeof(cb->args) - sizeof(cb->args[0]));
294 if (nf_tables_fill_table_info(skb,
295 NETLINK_CB(cb->skb).portid,
299 afi->family, table) < 0)
310 static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb,
311 const struct nlmsghdr *nlh,
312 const struct nlattr * const nla[])
314 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
315 const struct nft_af_info *afi;
316 const struct nft_table *table;
317 struct sk_buff *skb2;
318 struct net *net = sock_net(skb->sk);
319 int family = nfmsg->nfgen_family;
322 if (nlh->nlmsg_flags & NLM_F_DUMP) {
323 struct netlink_dump_control c = {
324 .dump = nf_tables_dump_tables,
326 return netlink_dump_start(nlsk, skb, nlh, &c);
329 afi = nf_tables_afinfo_lookup(net, family, false);
333 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
335 return PTR_ERR(table);
337 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
341 err = nf_tables_fill_table_info(skb2, NETLINK_CB(skb).portid,
342 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
347 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
354 static int nf_tables_table_enable(const struct nft_af_info *afi,
355 struct nft_table *table)
357 struct nft_chain *chain;
360 list_for_each_entry(chain, &table->chains, list) {
361 if (!(chain->flags & NFT_BASE_CHAIN))
364 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
372 list_for_each_entry(chain, &table->chains, list) {
373 if (!(chain->flags & NFT_BASE_CHAIN))
379 nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops);
384 static int nf_tables_table_disable(const struct nft_af_info *afi,
385 struct nft_table *table)
387 struct nft_chain *chain;
389 list_for_each_entry(chain, &table->chains, list) {
390 if (chain->flags & NFT_BASE_CHAIN)
391 nf_unregister_hooks(nft_base_chain(chain)->ops,
398 static int nf_tables_updtable(struct sock *nlsk, struct sk_buff *skb,
399 const struct nlmsghdr *nlh,
400 const struct nlattr * const nla[],
401 struct nft_af_info *afi, struct nft_table *table)
403 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
404 int family = nfmsg->nfgen_family, ret = 0;
406 if (nla[NFTA_TABLE_FLAGS]) {
409 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
410 if (flags & ~NFT_TABLE_F_DORMANT)
413 if ((flags & NFT_TABLE_F_DORMANT) &&
414 !(table->flags & NFT_TABLE_F_DORMANT)) {
415 ret = nf_tables_table_disable(afi, table);
417 table->flags |= NFT_TABLE_F_DORMANT;
418 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
419 table->flags & NFT_TABLE_F_DORMANT) {
420 ret = nf_tables_table_enable(afi, table);
422 table->flags &= ~NFT_TABLE_F_DORMANT;
428 nf_tables_table_notify(skb, nlh, table, NFT_MSG_NEWTABLE, family);
433 static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
434 const struct nlmsghdr *nlh,
435 const struct nlattr * const nla[])
437 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
438 const struct nlattr *name;
439 struct nft_af_info *afi;
440 struct nft_table *table;
441 struct net *net = sock_net(skb->sk);
442 int family = nfmsg->nfgen_family;
445 afi = nf_tables_afinfo_lookup(net, family, true);
449 name = nla[NFTA_TABLE_NAME];
450 table = nf_tables_table_lookup(afi, name);
452 if (PTR_ERR(table) != -ENOENT)
453 return PTR_ERR(table);
458 if (nlh->nlmsg_flags & NLM_F_EXCL)
460 if (nlh->nlmsg_flags & NLM_F_REPLACE)
462 return nf_tables_updtable(nlsk, skb, nlh, nla, afi, table);
465 if (nla[NFTA_TABLE_FLAGS]) {
466 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
467 if (flags & ~NFT_TABLE_F_DORMANT)
471 if (!try_module_get(afi->owner))
472 return -EAFNOSUPPORT;
474 table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL);
476 module_put(afi->owner);
480 nla_strlcpy(table->name, name, nla_len(name));
481 INIT_LIST_HEAD(&table->chains);
482 INIT_LIST_HEAD(&table->sets);
483 table->flags = flags;
485 list_add_tail(&table->list, &afi->tables);
486 nf_tables_table_notify(skb, nlh, table, NFT_MSG_NEWTABLE, family);
490 static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb,
491 const struct nlmsghdr *nlh,
492 const struct nlattr * const nla[])
494 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
495 struct nft_af_info *afi;
496 struct nft_table *table;
497 struct net *net = sock_net(skb->sk);
498 int family = nfmsg->nfgen_family;
500 afi = nf_tables_afinfo_lookup(net, family, false);
504 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
506 return PTR_ERR(table);
508 if (!list_empty(&table->chains) || !list_empty(&table->sets))
511 list_del(&table->list);
512 nf_tables_table_notify(skb, nlh, table, NFT_MSG_DELTABLE, family);
514 module_put(afi->owner);
518 int nft_register_chain_type(const struct nf_chain_type *ctype)
522 nfnl_lock(NFNL_SUBSYS_NFTABLES);
523 if (chain_type[ctype->family][ctype->type] != NULL) {
527 chain_type[ctype->family][ctype->type] = ctype;
529 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
532 EXPORT_SYMBOL_GPL(nft_register_chain_type);
534 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
536 nfnl_lock(NFNL_SUBSYS_NFTABLES);
537 chain_type[ctype->family][ctype->type] = NULL;
538 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
540 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
546 static struct nft_chain *
547 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
549 struct nft_chain *chain;
551 list_for_each_entry(chain, &table->chains, list) {
552 if (chain->handle == handle)
556 return ERR_PTR(-ENOENT);
559 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
560 const struct nlattr *nla)
562 struct nft_chain *chain;
565 return ERR_PTR(-EINVAL);
567 list_for_each_entry(chain, &table->chains, list) {
568 if (!nla_strcmp(nla, chain->name))
572 return ERR_PTR(-ENOENT);
575 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
576 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
577 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
578 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
579 .len = NFT_CHAIN_MAXNAMELEN - 1 },
580 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
581 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
582 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
583 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
586 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
587 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
588 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
591 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
593 struct nft_stats *cpu_stats, total;
597 memset(&total, 0, sizeof(total));
598 for_each_possible_cpu(cpu) {
599 cpu_stats = per_cpu_ptr(stats, cpu);
600 total.pkts += cpu_stats->pkts;
601 total.bytes += cpu_stats->bytes;
603 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
605 goto nla_put_failure;
607 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) ||
608 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes)))
609 goto nla_put_failure;
611 nla_nest_end(skb, nest);
618 static int nf_tables_fill_chain_info(struct sk_buff *skb, u32 portid, u32 seq,
619 int event, u32 flags, int family,
620 const struct nft_table *table,
621 const struct nft_chain *chain)
623 struct nlmsghdr *nlh;
624 struct nfgenmsg *nfmsg;
626 event |= NFNL_SUBSYS_NFTABLES << 8;
627 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
629 goto nla_put_failure;
631 nfmsg = nlmsg_data(nlh);
632 nfmsg->nfgen_family = family;
633 nfmsg->version = NFNETLINK_V0;
636 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
637 goto nla_put_failure;
638 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle)))
639 goto nla_put_failure;
640 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
641 goto nla_put_failure;
643 if (chain->flags & NFT_BASE_CHAIN) {
644 const struct nft_base_chain *basechain = nft_base_chain(chain);
645 const struct nf_hook_ops *ops = &basechain->ops[0];
648 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
650 goto nla_put_failure;
651 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
652 goto nla_put_failure;
653 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
654 goto nla_put_failure;
655 nla_nest_end(skb, nest);
657 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
658 htonl(basechain->policy)))
659 goto nla_put_failure;
661 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
662 goto nla_put_failure;
664 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
665 goto nla_put_failure;
668 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
669 goto nla_put_failure;
671 return nlmsg_end(skb, nlh);
674 nlmsg_trim(skb, nlh);
678 static int nf_tables_chain_notify(const struct sk_buff *oskb,
679 const struct nlmsghdr *nlh,
680 const struct nft_table *table,
681 const struct nft_chain *chain,
682 int event, int family)
685 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
686 struct net *net = oskb ? sock_net(oskb->sk) : &init_net;
687 u32 seq = nlh ? nlh->nlmsg_seq : 0;
691 report = nlh ? nlmsg_report(nlh) : false;
692 if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
696 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
700 err = nf_tables_fill_chain_info(skb, portid, seq, event, 0, family,
707 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report,
711 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
715 static int nf_tables_dump_chains(struct sk_buff *skb,
716 struct netlink_callback *cb)
718 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
719 const struct nft_af_info *afi;
720 const struct nft_table *table;
721 const struct nft_chain *chain;
722 unsigned int idx = 0, s_idx = cb->args[0];
723 struct net *net = sock_net(skb->sk);
724 int family = nfmsg->nfgen_family;
726 list_for_each_entry(afi, &net->nft.af_info, list) {
727 if (family != NFPROTO_UNSPEC && family != afi->family)
730 list_for_each_entry(table, &afi->tables, list) {
731 list_for_each_entry(chain, &table->chains, list) {
735 memset(&cb->args[1], 0,
736 sizeof(cb->args) - sizeof(cb->args[0]));
737 if (nf_tables_fill_chain_info(skb, NETLINK_CB(cb->skb).portid,
741 afi->family, table, chain) < 0)
754 static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb,
755 const struct nlmsghdr *nlh,
756 const struct nlattr * const nla[])
758 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
759 const struct nft_af_info *afi;
760 const struct nft_table *table;
761 const struct nft_chain *chain;
762 struct sk_buff *skb2;
763 struct net *net = sock_net(skb->sk);
764 int family = nfmsg->nfgen_family;
767 if (nlh->nlmsg_flags & NLM_F_DUMP) {
768 struct netlink_dump_control c = {
769 .dump = nf_tables_dump_chains,
771 return netlink_dump_start(nlsk, skb, nlh, &c);
774 afi = nf_tables_afinfo_lookup(net, family, false);
778 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
780 return PTR_ERR(table);
782 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
784 return PTR_ERR(chain);
786 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
790 err = nf_tables_fill_chain_info(skb2, NETLINK_CB(skb).portid,
791 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
792 family, table, chain);
796 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
803 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
804 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
805 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
808 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
810 struct nlattr *tb[NFTA_COUNTER_MAX+1];
811 struct nft_stats __percpu *newstats;
812 struct nft_stats *stats;
815 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
819 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
820 return ERR_PTR(-EINVAL);
822 newstats = alloc_percpu(struct nft_stats);
823 if (newstats == NULL)
824 return ERR_PTR(-ENOMEM);
826 /* Restore old counters on this cpu, no problem. Per-cpu statistics
827 * are not exposed to userspace.
829 stats = this_cpu_ptr(newstats);
830 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
831 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
836 static void nft_chain_stats_replace(struct nft_base_chain *chain,
837 struct nft_stats __percpu *newstats)
840 struct nft_stats __percpu *oldstats =
841 nft_dereference(chain->stats);
843 rcu_assign_pointer(chain->stats, newstats);
845 free_percpu(oldstats);
847 rcu_assign_pointer(chain->stats, newstats);
850 static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
851 const struct nlmsghdr *nlh,
852 const struct nlattr * const nla[])
854 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
855 const struct nlattr * uninitialized_var(name);
856 struct nft_af_info *afi;
857 struct nft_table *table;
858 struct nft_chain *chain;
859 struct nft_base_chain *basechain = NULL;
860 struct nlattr *ha[NFTA_HOOK_MAX + 1];
861 struct net *net = sock_net(skb->sk);
862 int family = nfmsg->nfgen_family;
863 u8 policy = NF_ACCEPT;
866 struct nft_stats __percpu *stats;
870 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
872 afi = nf_tables_afinfo_lookup(net, family, true);
876 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
878 return PTR_ERR(table);
881 name = nla[NFTA_CHAIN_NAME];
883 if (nla[NFTA_CHAIN_HANDLE]) {
884 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
885 chain = nf_tables_chain_lookup_byhandle(table, handle);
887 return PTR_ERR(chain);
889 chain = nf_tables_chain_lookup(table, name);
891 if (PTR_ERR(chain) != -ENOENT)
892 return PTR_ERR(chain);
897 if (nla[NFTA_CHAIN_POLICY]) {
898 if ((chain != NULL &&
899 !(chain->flags & NFT_BASE_CHAIN)) ||
900 nla[NFTA_CHAIN_HOOK] == NULL)
903 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
914 if (nlh->nlmsg_flags & NLM_F_EXCL)
916 if (nlh->nlmsg_flags & NLM_F_REPLACE)
919 if (nla[NFTA_CHAIN_HANDLE] && name &&
920 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
923 if (nla[NFTA_CHAIN_COUNTERS]) {
924 if (!(chain->flags & NFT_BASE_CHAIN))
927 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
929 return PTR_ERR(stats);
931 nft_chain_stats_replace(nft_base_chain(chain), stats);
934 if (nla[NFTA_CHAIN_POLICY])
935 nft_base_chain(chain)->policy = policy;
937 if (nla[NFTA_CHAIN_HANDLE] && name)
938 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
943 if (table->use == UINT_MAX)
946 if (nla[NFTA_CHAIN_HOOK]) {
947 const struct nf_chain_type *type;
948 struct nf_hook_ops *ops;
950 u32 hooknum, priority;
952 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
953 if (nla[NFTA_CHAIN_TYPE]) {
954 type = nf_tables_chain_type_lookup(afi,
955 nla[NFTA_CHAIN_TYPE],
958 return PTR_ERR(type);
961 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
965 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
966 ha[NFTA_HOOK_PRIORITY] == NULL)
969 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
970 if (hooknum >= afi->nhooks)
972 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
974 if (!(type->hook_mask & (1 << hooknum)))
976 if (!try_module_get(type->owner))
978 hookfn = type->hooks[hooknum];
980 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
981 if (basechain == NULL)
984 if (nla[NFTA_CHAIN_COUNTERS]) {
985 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
987 module_put(type->owner);
989 return PTR_ERR(stats);
991 basechain->stats = stats;
993 stats = alloc_percpu(struct nft_stats);
995 module_put(type->owner);
997 return PTR_ERR(stats);
999 rcu_assign_pointer(basechain->stats, stats);
1002 basechain->type = type;
1003 chain = &basechain->chain;
1005 for (i = 0; i < afi->nops; i++) {
1006 ops = &basechain->ops[i];
1008 ops->owner = afi->owner;
1009 ops->hooknum = hooknum;
1010 ops->priority = priority;
1012 ops->hook = afi->hooks[ops->hooknum];
1015 if (afi->hook_ops_init)
1016 afi->hook_ops_init(ops, i);
1019 chain->flags |= NFT_BASE_CHAIN;
1020 basechain->policy = policy;
1022 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1027 INIT_LIST_HEAD(&chain->rules);
1028 chain->handle = nf_tables_alloc_handle(table);
1030 chain->table = table;
1031 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1033 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1034 chain->flags & NFT_BASE_CHAIN) {
1035 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
1037 module_put(basechain->type->owner);
1038 free_percpu(basechain->stats);
1043 list_add_tail(&chain->list, &table->chains);
1046 nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_NEWCHAIN,
1051 static void nf_tables_chain_destroy(struct nft_chain *chain)
1053 BUG_ON(chain->use > 0);
1055 if (chain->flags & NFT_BASE_CHAIN) {
1056 module_put(nft_base_chain(chain)->type->owner);
1057 free_percpu(nft_base_chain(chain)->stats);
1058 kfree(nft_base_chain(chain));
1063 static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
1064 const struct nlmsghdr *nlh,
1065 const struct nlattr * const nla[])
1067 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1068 struct nft_af_info *afi;
1069 struct nft_table *table;
1070 struct nft_chain *chain;
1071 struct net *net = sock_net(skb->sk);
1072 int family = nfmsg->nfgen_family;
1074 afi = nf_tables_afinfo_lookup(net, family, false);
1076 return PTR_ERR(afi);
1078 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1080 return PTR_ERR(table);
1082 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1084 return PTR_ERR(chain);
1086 if (!list_empty(&chain->rules) || chain->use > 0)
1089 list_del(&chain->list);
1092 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1093 chain->flags & NFT_BASE_CHAIN)
1094 nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops);
1096 nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_DELCHAIN,
1099 /* Make sure all rule references are gone before this is released */
1102 nf_tables_chain_destroy(chain);
1111 * nft_register_expr - register nf_tables expr type
1114 * Registers the expr type for use with nf_tables. Returns zero on
1115 * success or a negative errno code otherwise.
1117 int nft_register_expr(struct nft_expr_type *type)
1119 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1120 if (type->family == NFPROTO_UNSPEC)
1121 list_add_tail(&type->list, &nf_tables_expressions);
1123 list_add(&type->list, &nf_tables_expressions);
1124 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1127 EXPORT_SYMBOL_GPL(nft_register_expr);
1130 * nft_unregister_expr - unregister nf_tables expr type
1133 * Unregisters the expr typefor use with nf_tables.
1135 void nft_unregister_expr(struct nft_expr_type *type)
1137 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1138 list_del(&type->list);
1139 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1141 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1143 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1146 const struct nft_expr_type *type;
1148 list_for_each_entry(type, &nf_tables_expressions, list) {
1149 if (!nla_strcmp(nla, type->name) &&
1150 (!type->family || type->family == family))
1156 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1159 const struct nft_expr_type *type;
1162 return ERR_PTR(-EINVAL);
1164 type = __nft_expr_type_get(family, nla);
1165 if (type != NULL && try_module_get(type->owner))
1168 #ifdef CONFIG_MODULES
1170 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1171 request_module("nft-expr-%u-%.*s", family,
1172 nla_len(nla), (char *)nla_data(nla));
1173 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1174 if (__nft_expr_type_get(family, nla))
1175 return ERR_PTR(-EAGAIN);
1177 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1178 request_module("nft-expr-%.*s",
1179 nla_len(nla), (char *)nla_data(nla));
1180 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1181 if (__nft_expr_type_get(family, nla))
1182 return ERR_PTR(-EAGAIN);
1185 return ERR_PTR(-ENOENT);
1188 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1189 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1190 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1193 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1194 const struct nft_expr *expr)
1196 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1197 goto nla_put_failure;
1199 if (expr->ops->dump) {
1200 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1202 goto nla_put_failure;
1203 if (expr->ops->dump(skb, expr) < 0)
1204 goto nla_put_failure;
1205 nla_nest_end(skb, data);
1214 struct nft_expr_info {
1215 const struct nft_expr_ops *ops;
1216 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1219 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1220 const struct nlattr *nla,
1221 struct nft_expr_info *info)
1223 const struct nft_expr_type *type;
1224 const struct nft_expr_ops *ops;
1225 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1228 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1232 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1234 return PTR_ERR(type);
1236 if (tb[NFTA_EXPR_DATA]) {
1237 err = nla_parse_nested(info->tb, type->maxattr,
1238 tb[NFTA_EXPR_DATA], type->policy);
1242 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1244 if (type->select_ops != NULL) {
1245 ops = type->select_ops(ctx,
1246 (const struct nlattr * const *)info->tb);
1258 module_put(type->owner);
1262 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1263 const struct nft_expr_info *info,
1264 struct nft_expr *expr)
1266 const struct nft_expr_ops *ops = info->ops;
1271 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1283 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1284 struct nft_expr *expr)
1286 if (expr->ops->destroy)
1287 expr->ops->destroy(ctx, expr);
1288 module_put(expr->ops->type->owner);
1295 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1298 struct nft_rule *rule;
1300 // FIXME: this sucks
1301 list_for_each_entry(rule, &chain->rules, list) {
1302 if (handle == rule->handle)
1306 return ERR_PTR(-ENOENT);
1309 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1310 const struct nlattr *nla)
1313 return ERR_PTR(-EINVAL);
1315 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1318 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1319 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1320 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1321 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1322 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1323 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1324 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1325 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1326 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1327 .len = NFT_USERDATA_MAXLEN },
1330 static int nf_tables_fill_rule_info(struct sk_buff *skb, u32 portid, u32 seq,
1331 int event, u32 flags, int family,
1332 const struct nft_table *table,
1333 const struct nft_chain *chain,
1334 const struct nft_rule *rule)
1336 struct nlmsghdr *nlh;
1337 struct nfgenmsg *nfmsg;
1338 const struct nft_expr *expr, *next;
1339 struct nlattr *list;
1340 const struct nft_rule *prule;
1341 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1343 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1346 goto nla_put_failure;
1348 nfmsg = nlmsg_data(nlh);
1349 nfmsg->nfgen_family = family;
1350 nfmsg->version = NFNETLINK_V0;
1353 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1354 goto nla_put_failure;
1355 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1356 goto nla_put_failure;
1357 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle)))
1358 goto nla_put_failure;
1360 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1361 prule = list_entry(rule->list.prev, struct nft_rule, list);
1362 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1363 cpu_to_be64(prule->handle)))
1364 goto nla_put_failure;
1367 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1369 goto nla_put_failure;
1370 nft_rule_for_each_expr(expr, next, rule) {
1371 struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM);
1373 goto nla_put_failure;
1374 if (nf_tables_fill_expr_info(skb, expr) < 0)
1375 goto nla_put_failure;
1376 nla_nest_end(skb, elem);
1378 nla_nest_end(skb, list);
1381 nla_put(skb, NFTA_RULE_USERDATA, rule->ulen, nft_userdata(rule)))
1382 goto nla_put_failure;
1384 return nlmsg_end(skb, nlh);
1387 nlmsg_trim(skb, nlh);
1391 static int nf_tables_rule_notify(const struct sk_buff *oskb,
1392 const struct nlmsghdr *nlh,
1393 const struct nft_table *table,
1394 const struct nft_chain *chain,
1395 const struct nft_rule *rule,
1396 int event, u32 flags, int family)
1398 struct sk_buff *skb;
1399 u32 portid = NETLINK_CB(oskb).portid;
1400 struct net *net = oskb ? sock_net(oskb->sk) : &init_net;
1401 u32 seq = nlh->nlmsg_seq;
1405 report = nlmsg_report(nlh);
1406 if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
1410 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1414 err = nf_tables_fill_rule_info(skb, portid, seq, event, flags,
1415 family, table, chain, rule);
1421 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report,
1425 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
1430 nft_rule_is_active(struct net *net, const struct nft_rule *rule)
1432 return (rule->genmask & (1 << net->nft.gencursor)) == 0;
1435 static inline int gencursor_next(struct net *net)
1437 return net->nft.gencursor+1 == 1 ? 1 : 0;
1441 nft_rule_is_active_next(struct net *net, const struct nft_rule *rule)
1443 return (rule->genmask & (1 << gencursor_next(net))) == 0;
1447 nft_rule_activate_next(struct net *net, struct nft_rule *rule)
1449 /* Now inactive, will be active in the future */
1450 rule->genmask = (1 << net->nft.gencursor);
1454 nft_rule_disactivate_next(struct net *net, struct nft_rule *rule)
1456 rule->genmask = (1 << gencursor_next(net));
1459 static inline void nft_rule_clear(struct net *net, struct nft_rule *rule)
1464 static int nf_tables_dump_rules(struct sk_buff *skb,
1465 struct netlink_callback *cb)
1467 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1468 const struct nft_af_info *afi;
1469 const struct nft_table *table;
1470 const struct nft_chain *chain;
1471 const struct nft_rule *rule;
1472 unsigned int idx = 0, s_idx = cb->args[0];
1473 struct net *net = sock_net(skb->sk);
1474 int family = nfmsg->nfgen_family;
1475 u8 genctr = ACCESS_ONCE(net->nft.genctr);
1476 u8 gencursor = ACCESS_ONCE(net->nft.gencursor);
1478 list_for_each_entry(afi, &net->nft.af_info, list) {
1479 if (family != NFPROTO_UNSPEC && family != afi->family)
1482 list_for_each_entry(table, &afi->tables, list) {
1483 list_for_each_entry(chain, &table->chains, list) {
1484 list_for_each_entry(rule, &chain->rules, list) {
1485 if (!nft_rule_is_active(net, rule))
1490 memset(&cb->args[1], 0,
1491 sizeof(cb->args) - sizeof(cb->args[0]));
1492 if (nf_tables_fill_rule_info(skb, NETLINK_CB(cb->skb).portid,
1495 NLM_F_MULTI | NLM_F_APPEND,
1496 afi->family, table, chain, rule) < 0)
1505 /* Invalidate this dump, a transition to the new generation happened */
1506 if (gencursor != net->nft.gencursor || genctr != net->nft.genctr)
1513 static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
1514 const struct nlmsghdr *nlh,
1515 const struct nlattr * const nla[])
1517 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1518 const struct nft_af_info *afi;
1519 const struct nft_table *table;
1520 const struct nft_chain *chain;
1521 const struct nft_rule *rule;
1522 struct sk_buff *skb2;
1523 struct net *net = sock_net(skb->sk);
1524 int family = nfmsg->nfgen_family;
1527 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1528 struct netlink_dump_control c = {
1529 .dump = nf_tables_dump_rules,
1531 return netlink_dump_start(nlsk, skb, nlh, &c);
1534 afi = nf_tables_afinfo_lookup(net, family, false);
1536 return PTR_ERR(afi);
1538 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1540 return PTR_ERR(table);
1542 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1544 return PTR_ERR(chain);
1546 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1548 return PTR_ERR(rule);
1550 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1554 err = nf_tables_fill_rule_info(skb2, NETLINK_CB(skb).portid,
1555 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1556 family, table, chain, rule);
1560 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1567 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1568 struct nft_rule *rule)
1570 struct nft_expr *expr;
1573 * Careful: some expressions might not be initialized in case this
1574 * is called on error from nf_tables_newrule().
1576 expr = nft_expr_first(rule);
1577 while (expr->ops && expr != nft_expr_last(rule)) {
1578 nf_tables_expr_destroy(ctx, expr);
1579 expr = nft_expr_next(expr);
1584 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
1585 struct nft_rule *rule)
1587 struct nft_trans *trans;
1589 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
1593 nft_trans_rule(trans) = rule;
1594 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1599 #define NFT_RULE_MAXEXPRS 128
1601 static struct nft_expr_info *info;
1603 static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
1604 const struct nlmsghdr *nlh,
1605 const struct nlattr * const nla[])
1607 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1608 struct nft_af_info *afi;
1609 struct net *net = sock_net(skb->sk);
1610 struct nft_table *table;
1611 struct nft_chain *chain;
1612 struct nft_rule *rule, *old_rule = NULL;
1613 struct nft_trans *trans = NULL;
1614 struct nft_expr *expr;
1617 unsigned int size, i, n, ulen = 0;
1620 u64 handle, pos_handle;
1622 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1624 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
1626 return PTR_ERR(afi);
1628 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1630 return PTR_ERR(table);
1632 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1634 return PTR_ERR(chain);
1636 if (nla[NFTA_RULE_HANDLE]) {
1637 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
1638 rule = __nf_tables_rule_lookup(chain, handle);
1640 return PTR_ERR(rule);
1642 if (nlh->nlmsg_flags & NLM_F_EXCL)
1644 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1649 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
1651 handle = nf_tables_alloc_handle(table);
1654 if (nla[NFTA_RULE_POSITION]) {
1655 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1658 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
1659 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
1660 if (IS_ERR(old_rule))
1661 return PTR_ERR(old_rule);
1664 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1668 if (nla[NFTA_RULE_EXPRESSIONS]) {
1669 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
1671 if (nla_type(tmp) != NFTA_LIST_ELEM)
1673 if (n == NFT_RULE_MAXEXPRS)
1675 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
1678 size += info[n].ops->size;
1683 if (nla[NFTA_RULE_USERDATA])
1684 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
1687 rule = kzalloc(sizeof(*rule) + size + ulen, GFP_KERNEL);
1691 nft_rule_activate_next(net, rule);
1693 rule->handle = handle;
1698 nla_memcpy(nft_userdata(rule), nla[NFTA_RULE_USERDATA], ulen);
1700 expr = nft_expr_first(rule);
1701 for (i = 0; i < n; i++) {
1702 err = nf_tables_newexpr(&ctx, &info[i], expr);
1706 expr = nft_expr_next(expr);
1709 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
1710 if (nft_rule_is_active_next(net, old_rule)) {
1711 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE,
1713 if (trans == NULL) {
1717 nft_rule_disactivate_next(net, old_rule);
1718 list_add_tail(&rule->list, &old_rule->list);
1723 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
1725 list_add_rcu(&rule->list, &old_rule->list);
1727 list_add_tail_rcu(&rule->list, &chain->rules);
1730 list_add_tail_rcu(&rule->list, &old_rule->list);
1732 list_add_rcu(&rule->list, &chain->rules);
1735 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
1742 list_del_rcu(&rule->list);
1744 list_del_rcu(&nft_trans_rule(trans)->list);
1745 nft_rule_clear(net, nft_trans_rule(trans));
1746 nft_trans_destroy(trans);
1749 nf_tables_rule_destroy(&ctx, rule);
1751 for (i = 0; i < n; i++) {
1752 if (info[i].ops != NULL)
1753 module_put(info[i].ops->type->owner);
1759 nf_tables_delrule_one(struct nft_ctx *ctx, struct nft_rule *rule)
1761 /* You cannot delete the same rule twice */
1762 if (nft_rule_is_active_next(ctx->net, rule)) {
1763 if (nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule) == NULL)
1765 nft_rule_disactivate_next(ctx->net, rule);
1771 static int nf_table_delrule_by_chain(struct nft_ctx *ctx)
1773 struct nft_rule *rule;
1776 list_for_each_entry(rule, &ctx->chain->rules, list) {
1777 err = nf_tables_delrule_one(ctx, rule);
1784 static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
1785 const struct nlmsghdr *nlh,
1786 const struct nlattr * const nla[])
1788 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1789 struct nft_af_info *afi;
1790 struct net *net = sock_net(skb->sk);
1791 struct nft_table *table;
1792 struct nft_chain *chain = NULL;
1793 struct nft_rule *rule;
1794 int family = nfmsg->nfgen_family, err = 0;
1797 afi = nf_tables_afinfo_lookup(net, family, false);
1799 return PTR_ERR(afi);
1801 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1803 return PTR_ERR(table);
1805 if (nla[NFTA_RULE_CHAIN]) {
1806 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1808 return PTR_ERR(chain);
1811 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1814 if (nla[NFTA_RULE_HANDLE]) {
1815 rule = nf_tables_rule_lookup(chain,
1816 nla[NFTA_RULE_HANDLE]);
1818 return PTR_ERR(rule);
1820 err = nf_tables_delrule_one(&ctx, rule);
1822 err = nf_table_delrule_by_chain(&ctx);
1825 list_for_each_entry(chain, &table->chains, list) {
1827 err = nf_table_delrule_by_chain(&ctx);
1840 static LIST_HEAD(nf_tables_set_ops);
1842 int nft_register_set(struct nft_set_ops *ops)
1844 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1845 list_add_tail(&ops->list, &nf_tables_set_ops);
1846 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1849 EXPORT_SYMBOL_GPL(nft_register_set);
1851 void nft_unregister_set(struct nft_set_ops *ops)
1853 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1854 list_del(&ops->list);
1855 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1857 EXPORT_SYMBOL_GPL(nft_unregister_set);
1860 * Select a set implementation based on the data characteristics and the
1861 * given policy. The total memory use might not be known if no size is
1862 * given, in that case the amount of memory per element is used.
1864 static const struct nft_set_ops *
1865 nft_select_set_ops(const struct nlattr * const nla[],
1866 const struct nft_set_desc *desc,
1867 enum nft_set_policies policy)
1869 const struct nft_set_ops *ops, *bops;
1870 struct nft_set_estimate est, best;
1873 #ifdef CONFIG_MODULES
1874 if (list_empty(&nf_tables_set_ops)) {
1875 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1876 request_module("nft-set");
1877 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1878 if (!list_empty(&nf_tables_set_ops))
1879 return ERR_PTR(-EAGAIN);
1883 if (nla[NFTA_SET_FLAGS] != NULL) {
1884 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
1885 features &= NFT_SET_INTERVAL | NFT_SET_MAP;
1892 list_for_each_entry(ops, &nf_tables_set_ops, list) {
1893 if ((ops->features & features) != features)
1895 if (!ops->estimate(desc, features, &est))
1899 case NFT_SET_POL_PERFORMANCE:
1900 if (est.class < best.class)
1902 if (est.class == best.class && est.size < best.size)
1905 case NFT_SET_POL_MEMORY:
1906 if (est.size < best.size)
1908 if (est.size == best.size && est.class < best.class)
1915 if (!try_module_get(ops->owner))
1918 module_put(bops->owner);
1927 return ERR_PTR(-EOPNOTSUPP);
1930 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
1931 [NFTA_SET_TABLE] = { .type = NLA_STRING },
1932 [NFTA_SET_NAME] = { .type = NLA_STRING },
1933 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
1934 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
1935 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
1936 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
1937 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
1938 [NFTA_SET_POLICY] = { .type = NLA_U32 },
1939 [NFTA_SET_DESC] = { .type = NLA_NESTED },
1940 [NFTA_SET_ID] = { .type = NLA_U32 },
1943 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
1944 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
1947 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx,
1948 const struct sk_buff *skb,
1949 const struct nlmsghdr *nlh,
1950 const struct nlattr * const nla[])
1952 struct net *net = sock_net(skb->sk);
1953 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1954 struct nft_af_info *afi = NULL;
1955 struct nft_table *table = NULL;
1957 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
1958 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
1960 return PTR_ERR(afi);
1963 if (nla[NFTA_SET_TABLE] != NULL) {
1965 return -EAFNOSUPPORT;
1967 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
1969 return PTR_ERR(table);
1972 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
1976 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
1977 const struct nlattr *nla)
1979 struct nft_set *set;
1982 return ERR_PTR(-EINVAL);
1984 list_for_each_entry(set, &table->sets, list) {
1985 if (!nla_strcmp(nla, set->name))
1988 return ERR_PTR(-ENOENT);
1991 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
1992 const struct nlattr *nla)
1994 struct nft_trans *trans;
1995 u32 id = ntohl(nla_get_be32(nla));
1997 list_for_each_entry(trans, &net->nft.commit_list, list) {
1998 if (trans->msg_type == NFT_MSG_NEWSET &&
1999 id == nft_trans_set_id(trans))
2000 return nft_trans_set(trans);
2002 return ERR_PTR(-ENOENT);
2005 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2008 const struct nft_set *i;
2010 unsigned long *inuse;
2011 unsigned int n = 0, min = 0;
2013 p = strnchr(name, IFNAMSIZ, '%');
2015 if (p[1] != 'd' || strchr(p + 2, '%'))
2018 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2022 list_for_each_entry(i, &ctx->table->sets, list) {
2025 if (!sscanf(i->name, name, &tmp))
2027 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2030 set_bit(tmp - min, inuse);
2033 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2034 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2035 min += BITS_PER_BYTE * PAGE_SIZE;
2036 memset(inuse, 0, PAGE_SIZE);
2039 free_page((unsigned long)inuse);
2042 snprintf(set->name, sizeof(set->name), name, min + n);
2043 list_for_each_entry(i, &ctx->table->sets, list) {
2044 if (!strcmp(set->name, i->name))
2050 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2051 const struct nft_set *set, u16 event, u16 flags)
2053 struct nfgenmsg *nfmsg;
2054 struct nlmsghdr *nlh;
2055 struct nlattr *desc;
2056 u32 portid = NETLINK_CB(ctx->skb).portid;
2057 u32 seq = ctx->nlh->nlmsg_seq;
2059 event |= NFNL_SUBSYS_NFTABLES << 8;
2060 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2063 goto nla_put_failure;
2065 nfmsg = nlmsg_data(nlh);
2066 nfmsg->nfgen_family = ctx->afi->family;
2067 nfmsg->version = NFNETLINK_V0;
2070 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2071 goto nla_put_failure;
2072 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2073 goto nla_put_failure;
2074 if (set->flags != 0)
2075 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2076 goto nla_put_failure;
2078 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2079 goto nla_put_failure;
2080 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2081 goto nla_put_failure;
2082 if (set->flags & NFT_SET_MAP) {
2083 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2084 goto nla_put_failure;
2085 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2086 goto nla_put_failure;
2089 desc = nla_nest_start(skb, NFTA_SET_DESC);
2091 goto nla_put_failure;
2093 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2094 goto nla_put_failure;
2095 nla_nest_end(skb, desc);
2097 return nlmsg_end(skb, nlh);
2100 nlmsg_trim(skb, nlh);
2104 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2105 const struct nft_set *set,
2108 struct sk_buff *skb;
2109 u32 portid = NETLINK_CB(ctx->skb).portid;
2113 report = nlmsg_report(ctx->nlh);
2114 if (!report && !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2118 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2122 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2128 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, report,
2132 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2136 static int nf_tables_dump_sets_table(struct nft_ctx *ctx, struct sk_buff *skb,
2137 struct netlink_callback *cb)
2139 const struct nft_set *set;
2140 unsigned int idx = 0, s_idx = cb->args[0];
2145 list_for_each_entry(set, &ctx->table->sets, list) {
2148 if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET,
2161 static int nf_tables_dump_sets_family(struct nft_ctx *ctx, struct sk_buff *skb,
2162 struct netlink_callback *cb)
2164 const struct nft_set *set;
2165 unsigned int idx, s_idx = cb->args[0];
2166 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2171 list_for_each_entry(table, &ctx->afi->tables, list) {
2173 if (cur_table != table)
2180 list_for_each_entry(set, &ctx->table->sets, list) {
2183 if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET,
2186 cb->args[2] = (unsigned long) table;
2198 static int nf_tables_dump_sets_all(struct nft_ctx *ctx, struct sk_buff *skb,
2199 struct netlink_callback *cb)
2201 const struct nft_set *set;
2202 unsigned int idx, s_idx = cb->args[0];
2203 struct nft_af_info *afi;
2204 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2205 struct net *net = sock_net(skb->sk);
2206 int cur_family = cb->args[3];
2211 list_for_each_entry(afi, &net->nft.af_info, list) {
2213 if (afi->family != cur_family)
2219 list_for_each_entry(table, &afi->tables, list) {
2221 if (cur_table != table)
2230 list_for_each_entry(set, &ctx->table->sets, list) {
2233 if (nf_tables_fill_set(skb, ctx, set,
2237 cb->args[2] = (unsigned long) table;
2238 cb->args[3] = afi->family;
2253 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2255 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2256 struct nlattr *nla[NFTA_SET_MAX + 1];
2260 err = nlmsg_parse(cb->nlh, sizeof(*nfmsg), nla, NFTA_SET_MAX,
2265 err = nft_ctx_init_from_setattr(&ctx, cb->skb, cb->nlh, (void *)nla);
2269 if (ctx.table == NULL) {
2270 if (ctx.afi == NULL)
2271 ret = nf_tables_dump_sets_all(&ctx, skb, cb);
2273 ret = nf_tables_dump_sets_family(&ctx, skb, cb);
2275 ret = nf_tables_dump_sets_table(&ctx, skb, cb);
2280 #define NFT_SET_INACTIVE (1 << 15) /* Internal set flag */
2282 static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
2283 const struct nlmsghdr *nlh,
2284 const struct nlattr * const nla[])
2286 const struct nft_set *set;
2288 struct sk_buff *skb2;
2289 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2292 /* Verify existance before starting dump */
2293 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2297 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2298 struct netlink_dump_control c = {
2299 .dump = nf_tables_dump_sets,
2301 return netlink_dump_start(nlsk, skb, nlh, &c);
2304 /* Only accept unspec with dump */
2305 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2306 return -EAFNOSUPPORT;
2308 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2310 return PTR_ERR(set);
2311 if (set->flags & NFT_SET_INACTIVE)
2314 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2318 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2322 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2329 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2330 struct nft_set_desc *desc,
2331 const struct nlattr *nla)
2333 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2336 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2340 if (da[NFTA_SET_DESC_SIZE] != NULL)
2341 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2346 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
2347 struct nft_set *set)
2349 struct nft_trans *trans;
2351 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
2355 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
2356 nft_trans_set_id(trans) =
2357 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
2358 set->flags |= NFT_SET_INACTIVE;
2360 nft_trans_set(trans) = set;
2361 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2366 static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
2367 const struct nlmsghdr *nlh,
2368 const struct nlattr * const nla[])
2370 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2371 const struct nft_set_ops *ops;
2372 struct nft_af_info *afi;
2373 struct net *net = sock_net(skb->sk);
2374 struct nft_table *table;
2375 struct nft_set *set;
2377 char name[IFNAMSIZ];
2380 u32 ktype, dtype, flags, policy;
2381 struct nft_set_desc desc;
2384 if (nla[NFTA_SET_TABLE] == NULL ||
2385 nla[NFTA_SET_NAME] == NULL ||
2386 nla[NFTA_SET_KEY_LEN] == NULL ||
2387 nla[NFTA_SET_ID] == NULL)
2390 memset(&desc, 0, sizeof(desc));
2392 ktype = NFT_DATA_VALUE;
2393 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2394 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2395 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2399 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2400 if (desc.klen == 0 || desc.klen > FIELD_SIZEOF(struct nft_data, data))
2404 if (nla[NFTA_SET_FLAGS] != NULL) {
2405 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2406 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2407 NFT_SET_INTERVAL | NFT_SET_MAP))
2412 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2413 if (!(flags & NFT_SET_MAP))
2416 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2417 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2418 dtype != NFT_DATA_VERDICT)
2421 if (dtype != NFT_DATA_VERDICT) {
2422 if (nla[NFTA_SET_DATA_LEN] == NULL)
2424 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2425 if (desc.dlen == 0 ||
2426 desc.dlen > FIELD_SIZEOF(struct nft_data, data))
2429 desc.dlen = sizeof(struct nft_data);
2430 } else if (flags & NFT_SET_MAP)
2433 policy = NFT_SET_POL_PERFORMANCE;
2434 if (nla[NFTA_SET_POLICY] != NULL)
2435 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2437 if (nla[NFTA_SET_DESC] != NULL) {
2438 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2443 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2445 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2447 return PTR_ERR(afi);
2449 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2451 return PTR_ERR(table);
2453 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
2455 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2457 if (PTR_ERR(set) != -ENOENT)
2458 return PTR_ERR(set);
2463 if (nlh->nlmsg_flags & NLM_F_EXCL)
2465 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2470 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2473 ops = nft_select_set_ops(nla, &desc, policy);
2475 return PTR_ERR(ops);
2478 if (ops->privsize != NULL)
2479 size = ops->privsize(nla);
2482 set = kzalloc(sizeof(*set) + size, GFP_KERNEL);
2486 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2487 err = nf_tables_set_alloc_name(&ctx, set, name);
2491 INIT_LIST_HEAD(&set->bindings);
2494 set->klen = desc.klen;
2496 set->dlen = desc.dlen;
2498 set->size = desc.size;
2500 err = ops->init(set, &desc, nla);
2504 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2508 list_add_tail(&set->list, &table->sets);
2514 module_put(ops->owner);
2518 static void nft_set_destroy(struct nft_set *set)
2520 set->ops->destroy(set);
2521 module_put(set->ops->owner);
2525 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2527 list_del(&set->list);
2528 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET);
2529 nft_set_destroy(set);
2532 static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
2533 const struct nlmsghdr *nlh,
2534 const struct nlattr * const nla[])
2536 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2537 struct nft_set *set;
2541 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2542 return -EAFNOSUPPORT;
2543 if (nla[NFTA_SET_TABLE] == NULL)
2546 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2550 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2552 return PTR_ERR(set);
2553 if (set->flags & NFT_SET_INACTIVE)
2555 if (!list_empty(&set->bindings))
2558 err = nft_trans_set_add(&ctx, NFT_MSG_DELSET, set);
2562 list_del(&set->list);
2566 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2567 const struct nft_set *set,
2568 const struct nft_set_iter *iter,
2569 const struct nft_set_elem *elem)
2571 enum nft_registers dreg;
2573 dreg = nft_type_to_reg(set->dtype);
2574 return nft_validate_data_load(ctx, dreg, &elem->data,
2575 set->dtype == NFT_DATA_VERDICT ?
2576 NFT_DATA_VERDICT : NFT_DATA_VALUE);
2579 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2580 struct nft_set_binding *binding)
2582 struct nft_set_binding *i;
2583 struct nft_set_iter iter;
2585 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2588 if (set->flags & NFT_SET_MAP) {
2589 /* If the set is already bound to the same chain all
2590 * jumps are already validated for that chain.
2592 list_for_each_entry(i, &set->bindings, list) {
2593 if (i->chain == binding->chain)
2600 iter.fn = nf_tables_bind_check_setelem;
2602 set->ops->walk(ctx, set, &iter);
2604 /* Destroy anonymous sets if binding fails */
2605 if (set->flags & NFT_SET_ANONYMOUS)
2606 nf_tables_set_destroy(ctx, set);
2612 binding->chain = ctx->chain;
2613 list_add_tail(&binding->list, &set->bindings);
2617 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2618 struct nft_set_binding *binding)
2620 list_del(&binding->list);
2622 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2623 !(set->flags & NFT_SET_INACTIVE))
2624 nf_tables_set_destroy(ctx, set);
2631 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
2632 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
2633 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
2634 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
2637 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
2638 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
2639 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
2640 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
2641 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
2644 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx,
2645 const struct sk_buff *skb,
2646 const struct nlmsghdr *nlh,
2647 const struct nlattr * const nla[])
2649 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2650 struct nft_af_info *afi;
2651 struct nft_table *table;
2652 struct net *net = sock_net(skb->sk);
2654 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2656 return PTR_ERR(afi);
2658 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
2660 return PTR_ERR(table);
2662 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2666 static int nf_tables_fill_setelem(struct sk_buff *skb,
2667 const struct nft_set *set,
2668 const struct nft_set_elem *elem)
2670 unsigned char *b = skb_tail_pointer(skb);
2671 struct nlattr *nest;
2673 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
2675 goto nla_put_failure;
2677 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE,
2679 goto nla_put_failure;
2681 if (set->flags & NFT_SET_MAP &&
2682 !(elem->flags & NFT_SET_ELEM_INTERVAL_END) &&
2683 nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data,
2684 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
2686 goto nla_put_failure;
2688 if (elem->flags != 0)
2689 if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags)))
2690 goto nla_put_failure;
2692 nla_nest_end(skb, nest);
2700 struct nft_set_dump_args {
2701 const struct netlink_callback *cb;
2702 struct nft_set_iter iter;
2703 struct sk_buff *skb;
2706 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
2707 const struct nft_set *set,
2708 const struct nft_set_iter *iter,
2709 const struct nft_set_elem *elem)
2711 struct nft_set_dump_args *args;
2713 args = container_of(iter, struct nft_set_dump_args, iter);
2714 return nf_tables_fill_setelem(args->skb, set, elem);
2717 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
2719 const struct nft_set *set;
2720 struct nft_set_dump_args args;
2722 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
2723 struct nfgenmsg *nfmsg;
2724 struct nlmsghdr *nlh;
2725 struct nlattr *nest;
2729 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
2730 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
2734 err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla);
2738 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2740 return PTR_ERR(set);
2741 if (set->flags & NFT_SET_INACTIVE)
2744 event = NFT_MSG_NEWSETELEM;
2745 event |= NFNL_SUBSYS_NFTABLES << 8;
2746 portid = NETLINK_CB(cb->skb).portid;
2747 seq = cb->nlh->nlmsg_seq;
2749 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2752 goto nla_put_failure;
2754 nfmsg = nlmsg_data(nlh);
2755 nfmsg->nfgen_family = NFPROTO_UNSPEC;
2756 nfmsg->version = NFNETLINK_V0;
2759 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
2760 goto nla_put_failure;
2761 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
2762 goto nla_put_failure;
2764 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2766 goto nla_put_failure;
2770 args.iter.skip = cb->args[0];
2771 args.iter.count = 0;
2773 args.iter.fn = nf_tables_dump_setelem;
2774 set->ops->walk(&ctx, set, &args.iter);
2776 nla_nest_end(skb, nest);
2777 nlmsg_end(skb, nlh);
2779 if (args.iter.err && args.iter.err != -EMSGSIZE)
2780 return args.iter.err;
2781 if (args.iter.count == cb->args[0])
2784 cb->args[0] = args.iter.count;
2791 static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb,
2792 const struct nlmsghdr *nlh,
2793 const struct nlattr * const nla[])
2795 const struct nft_set *set;
2799 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla);
2803 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2805 return PTR_ERR(set);
2806 if (set->flags & NFT_SET_INACTIVE)
2809 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2810 struct netlink_dump_control c = {
2811 .dump = nf_tables_dump_set,
2813 return netlink_dump_start(nlsk, skb, nlh, &c);
2818 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
2819 const struct nft_ctx *ctx, u32 seq,
2820 u32 portid, int event, u16 flags,
2821 const struct nft_set *set,
2822 const struct nft_set_elem *elem)
2824 struct nfgenmsg *nfmsg;
2825 struct nlmsghdr *nlh;
2826 struct nlattr *nest;
2829 event |= NFNL_SUBSYS_NFTABLES << 8;
2830 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2833 goto nla_put_failure;
2835 nfmsg = nlmsg_data(nlh);
2836 nfmsg->nfgen_family = ctx->afi->family;
2837 nfmsg->version = NFNETLINK_V0;
2840 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2841 goto nla_put_failure;
2842 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2843 goto nla_put_failure;
2845 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2847 goto nla_put_failure;
2849 err = nf_tables_fill_setelem(skb, set, elem);
2851 goto nla_put_failure;
2853 nla_nest_end(skb, nest);
2855 return nlmsg_end(skb, nlh);
2858 nlmsg_trim(skb, nlh);
2862 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
2863 const struct nft_set *set,
2864 const struct nft_set_elem *elem,
2865 int event, u16 flags)
2867 const struct sk_buff *oskb = ctx->skb;
2868 struct net *net = sock_net(oskb->sk);
2869 u32 portid = NETLINK_CB(oskb).portid;
2870 bool report = nlmsg_report(ctx->nlh);
2871 struct sk_buff *skb;
2874 if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
2878 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2882 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
2889 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report,
2893 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
2897 static int nft_add_set_elem(const struct nft_ctx *ctx, struct nft_set *set,
2898 const struct nlattr *attr)
2900 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
2901 struct nft_data_desc d1, d2;
2902 struct nft_set_elem elem;
2903 struct nft_set_binding *binding;
2904 enum nft_registers dreg;
2907 if (set->size && set->nelems == set->size)
2910 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
2911 nft_set_elem_policy);
2915 if (nla[NFTA_SET_ELEM_KEY] == NULL)
2919 if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
2920 elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
2921 if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END)
2925 if (set->flags & NFT_SET_MAP) {
2926 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
2927 !(elem.flags & NFT_SET_ELEM_INTERVAL_END))
2929 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
2930 elem.flags & NFT_SET_ELEM_INTERVAL_END)
2933 if (nla[NFTA_SET_ELEM_DATA] != NULL)
2937 err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]);
2941 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
2945 if (set->ops->get(set, &elem) == 0)
2948 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
2949 err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]);
2954 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
2957 dreg = nft_type_to_reg(set->dtype);
2958 list_for_each_entry(binding, &set->bindings, list) {
2959 struct nft_ctx bind_ctx = {
2961 .table = ctx->table,
2962 .chain = (struct nft_chain *)binding->chain,
2965 err = nft_validate_data_load(&bind_ctx, dreg,
2966 &elem.data, d2.type);
2972 err = set->ops->insert(set, &elem);
2977 nf_tables_setelem_notify(ctx, set, &elem, NFT_MSG_NEWSETELEM, 0);
2981 if (nla[NFTA_SET_ELEM_DATA] != NULL)
2982 nft_data_uninit(&elem.data, d2.type);
2984 nft_data_uninit(&elem.key, d1.type);
2989 static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb,
2990 const struct nlmsghdr *nlh,
2991 const struct nlattr * const nla[])
2993 struct net *net = sock_net(skb->sk);
2994 const struct nlattr *attr;
2995 struct nft_set *set;
2999 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla);
3003 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3005 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3006 set = nf_tables_set_lookup_byid(net,
3007 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3010 return PTR_ERR(set);
3013 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3016 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3017 err = nft_add_set_elem(&ctx, set, attr);
3024 static int nft_del_setelem(const struct nft_ctx *ctx, struct nft_set *set,
3025 const struct nlattr *attr)
3027 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3028 struct nft_data_desc desc;
3029 struct nft_set_elem elem;
3032 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3033 nft_set_elem_policy);
3038 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3041 err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]);
3046 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3049 err = set->ops->get(set, &elem);
3053 set->ops->remove(set, &elem);
3056 nf_tables_setelem_notify(ctx, set, &elem, NFT_MSG_DELSETELEM, 0);
3058 nft_data_uninit(&elem.key, NFT_DATA_VALUE);
3059 if (set->flags & NFT_SET_MAP)
3060 nft_data_uninit(&elem.data, set->dtype);
3063 nft_data_uninit(&elem.key, desc.type);
3068 static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb,
3069 const struct nlmsghdr *nlh,
3070 const struct nlattr * const nla[])
3072 const struct nlattr *attr;
3073 struct nft_set *set;
3077 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla);
3081 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3083 return PTR_ERR(set);
3084 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3087 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3088 err = nft_del_setelem(&ctx, set, attr);
3095 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3096 [NFT_MSG_NEWTABLE] = {
3097 .call = nf_tables_newtable,
3098 .attr_count = NFTA_TABLE_MAX,
3099 .policy = nft_table_policy,
3101 [NFT_MSG_GETTABLE] = {
3102 .call = nf_tables_gettable,
3103 .attr_count = NFTA_TABLE_MAX,
3104 .policy = nft_table_policy,
3106 [NFT_MSG_DELTABLE] = {
3107 .call = nf_tables_deltable,
3108 .attr_count = NFTA_TABLE_MAX,
3109 .policy = nft_table_policy,
3111 [NFT_MSG_NEWCHAIN] = {
3112 .call = nf_tables_newchain,
3113 .attr_count = NFTA_CHAIN_MAX,
3114 .policy = nft_chain_policy,
3116 [NFT_MSG_GETCHAIN] = {
3117 .call = nf_tables_getchain,
3118 .attr_count = NFTA_CHAIN_MAX,
3119 .policy = nft_chain_policy,
3121 [NFT_MSG_DELCHAIN] = {
3122 .call = nf_tables_delchain,
3123 .attr_count = NFTA_CHAIN_MAX,
3124 .policy = nft_chain_policy,
3126 [NFT_MSG_NEWRULE] = {
3127 .call_batch = nf_tables_newrule,
3128 .attr_count = NFTA_RULE_MAX,
3129 .policy = nft_rule_policy,
3131 [NFT_MSG_GETRULE] = {
3132 .call = nf_tables_getrule,
3133 .attr_count = NFTA_RULE_MAX,
3134 .policy = nft_rule_policy,
3136 [NFT_MSG_DELRULE] = {
3137 .call_batch = nf_tables_delrule,
3138 .attr_count = NFTA_RULE_MAX,
3139 .policy = nft_rule_policy,
3141 [NFT_MSG_NEWSET] = {
3142 .call_batch = nf_tables_newset,
3143 .attr_count = NFTA_SET_MAX,
3144 .policy = nft_set_policy,
3146 [NFT_MSG_GETSET] = {
3147 .call = nf_tables_getset,
3148 .attr_count = NFTA_SET_MAX,
3149 .policy = nft_set_policy,
3151 [NFT_MSG_DELSET] = {
3152 .call_batch = nf_tables_delset,
3153 .attr_count = NFTA_SET_MAX,
3154 .policy = nft_set_policy,
3156 [NFT_MSG_NEWSETELEM] = {
3157 .call_batch = nf_tables_newsetelem,
3158 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3159 .policy = nft_set_elem_list_policy,
3161 [NFT_MSG_GETSETELEM] = {
3162 .call = nf_tables_getsetelem,
3163 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3164 .policy = nft_set_elem_list_policy,
3166 [NFT_MSG_DELSETELEM] = {
3167 .call_batch = nf_tables_delsetelem,
3168 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3169 .policy = nft_set_elem_list_policy,
3173 static int nf_tables_commit(struct sk_buff *skb)
3175 struct net *net = sock_net(skb->sk);
3176 struct nft_trans *trans, *next;
3178 /* Bump generation counter, invalidate any dump in progress */
3181 /* A new generation has just started */
3182 net->nft.gencursor = gencursor_next(net);
3184 /* Make sure all packets have left the previous generation before
3185 * purging old rules.
3189 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3190 switch (trans->msg_type) {
3191 case NFT_MSG_NEWRULE:
3192 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3193 nf_tables_rule_notify(trans->ctx.skb, trans->ctx.nlh,
3196 nft_trans_rule(trans),
3198 trans->ctx.afi->family);
3199 nft_trans_destroy(trans);
3201 case NFT_MSG_DELRULE:
3202 list_del_rcu(&nft_trans_rule(trans)->list);
3203 nf_tables_rule_notify(trans->ctx.skb, trans->ctx.nlh,
3206 nft_trans_rule(trans), NFT_MSG_DELRULE, 0,
3207 trans->ctx.afi->family);
3209 case NFT_MSG_NEWSET:
3210 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
3211 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3213 nft_trans_destroy(trans);
3215 case NFT_MSG_DELSET:
3216 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3222 /* Make sure we don't see any packet traversing old rules */
3225 /* Now we can safely release unused old rules */
3226 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3227 switch (trans->msg_type) {
3228 case NFT_MSG_DELRULE:
3229 nf_tables_rule_destroy(&trans->ctx,
3230 nft_trans_rule(trans));
3232 case NFT_MSG_DELSET:
3233 nft_set_destroy(nft_trans_set(trans));
3236 nft_trans_destroy(trans);
3242 static int nf_tables_abort(struct sk_buff *skb)
3244 struct net *net = sock_net(skb->sk);
3245 struct nft_trans *trans, *next;
3247 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3248 switch (trans->msg_type) {
3249 case NFT_MSG_NEWRULE:
3250 list_del_rcu(&nft_trans_rule(trans)->list);
3252 case NFT_MSG_DELRULE:
3253 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3254 nft_trans_destroy(trans);
3256 case NFT_MSG_NEWSET:
3257 list_del(&nft_trans_set(trans)->list);
3259 case NFT_MSG_DELSET:
3260 list_add_tail(&nft_trans_set(trans)->list,
3261 &trans->ctx.table->sets);
3262 nft_trans_destroy(trans);
3267 /* Make sure we don't see any packet accessing aborted rules */
3270 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3271 switch (trans->msg_type) {
3272 case NFT_MSG_NEWRULE:
3273 nf_tables_rule_destroy(&trans->ctx,
3274 nft_trans_rule(trans));
3276 case NFT_MSG_NEWSET:
3277 nft_set_destroy(nft_trans_set(trans));
3280 nft_trans_destroy(trans);
3286 static const struct nfnetlink_subsystem nf_tables_subsys = {
3287 .name = "nf_tables",
3288 .subsys_id = NFNL_SUBSYS_NFTABLES,
3289 .cb_count = NFT_MSG_MAX,
3291 .commit = nf_tables_commit,
3292 .abort = nf_tables_abort,
3296 * Loop detection - walk through the ruleset beginning at the destination chain
3297 * of a new jump until either the source chain is reached (loop) or all
3298 * reachable chains have been traversed.
3300 * The loop check is performed whenever a new jump verdict is added to an
3301 * expression or verdict map or a verdict map is bound to a new chain.
3304 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3305 const struct nft_chain *chain);
3307 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
3308 const struct nft_set *set,
3309 const struct nft_set_iter *iter,
3310 const struct nft_set_elem *elem)
3312 if (elem->flags & NFT_SET_ELEM_INTERVAL_END)
3315 switch (elem->data.verdict) {
3318 return nf_tables_check_loops(ctx, elem->data.chain);
3324 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3325 const struct nft_chain *chain)
3327 const struct nft_rule *rule;
3328 const struct nft_expr *expr, *last;
3329 const struct nft_set *set;
3330 struct nft_set_binding *binding;
3331 struct nft_set_iter iter;
3333 if (ctx->chain == chain)
3336 list_for_each_entry(rule, &chain->rules, list) {
3337 nft_rule_for_each_expr(expr, last, rule) {
3338 const struct nft_data *data = NULL;
3341 if (!expr->ops->validate)
3344 err = expr->ops->validate(ctx, expr, &data);
3351 switch (data->verdict) {
3354 err = nf_tables_check_loops(ctx, data->chain);
3363 list_for_each_entry(set, &ctx->table->sets, list) {
3364 if (!(set->flags & NFT_SET_MAP) ||
3365 set->dtype != NFT_DATA_VERDICT)
3368 list_for_each_entry(binding, &set->bindings, list) {
3369 if (binding->chain != chain)
3375 iter.fn = nf_tables_loop_check_setelem;
3377 set->ops->walk(ctx, set, &iter);
3387 * nft_validate_input_register - validate an expressions' input register
3389 * @reg: the register number
3391 * Validate that the input register is one of the general purpose
3394 int nft_validate_input_register(enum nft_registers reg)
3396 if (reg <= NFT_REG_VERDICT)
3398 if (reg > NFT_REG_MAX)
3402 EXPORT_SYMBOL_GPL(nft_validate_input_register);
3405 * nft_validate_output_register - validate an expressions' output register
3407 * @reg: the register number
3409 * Validate that the output register is one of the general purpose
3410 * registers or the verdict register.
3412 int nft_validate_output_register(enum nft_registers reg)
3414 if (reg < NFT_REG_VERDICT)
3416 if (reg > NFT_REG_MAX)
3420 EXPORT_SYMBOL_GPL(nft_validate_output_register);
3423 * nft_validate_data_load - validate an expressions' data load
3425 * @ctx: context of the expression performing the load
3426 * @reg: the destination register number
3427 * @data: the data to load
3428 * @type: the data type
3430 * Validate that a data load uses the appropriate data type for
3431 * the destination register. A value of NULL for the data means
3432 * that its runtime gathered data, which is always of type
3435 int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg,
3436 const struct nft_data *data,
3437 enum nft_data_types type)
3442 case NFT_REG_VERDICT:
3443 if (data == NULL || type != NFT_DATA_VERDICT)
3446 if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) {
3447 err = nf_tables_check_loops(ctx, data->chain);
3451 if (ctx->chain->level + 1 > data->chain->level) {
3452 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
3454 data->chain->level = ctx->chain->level + 1;
3460 if (data != NULL && type != NFT_DATA_VALUE)
3465 EXPORT_SYMBOL_GPL(nft_validate_data_load);
3467 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
3468 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
3469 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
3470 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3473 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
3474 struct nft_data_desc *desc, const struct nlattr *nla)
3476 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
3477 struct nft_chain *chain;
3480 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
3484 if (!tb[NFTA_VERDICT_CODE])
3486 data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
3488 switch (data->verdict) {
3490 switch (data->verdict & NF_VERDICT_MASK) {
3502 desc->len = sizeof(data->verdict);
3506 if (!tb[NFTA_VERDICT_CHAIN])
3508 chain = nf_tables_chain_lookup(ctx->table,
3509 tb[NFTA_VERDICT_CHAIN]);
3511 return PTR_ERR(chain);
3512 if (chain->flags & NFT_BASE_CHAIN)
3516 data->chain = chain;
3517 desc->len = sizeof(data);
3521 desc->type = NFT_DATA_VERDICT;
3525 static void nft_verdict_uninit(const struct nft_data *data)
3527 switch (data->verdict) {
3535 static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data)
3537 struct nlattr *nest;
3539 nest = nla_nest_start(skb, NFTA_DATA_VERDICT);
3541 goto nla_put_failure;
3543 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict)))
3544 goto nla_put_failure;
3546 switch (data->verdict) {
3549 if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name))
3550 goto nla_put_failure;
3552 nla_nest_end(skb, nest);
3559 static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data,
3560 struct nft_data_desc *desc, const struct nlattr *nla)
3567 if (len > sizeof(data->data))
3570 nla_memcpy(data->data, nla, sizeof(data->data));
3571 desc->type = NFT_DATA_VALUE;
3576 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
3579 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
3582 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
3583 [NFTA_DATA_VALUE] = { .type = NLA_BINARY,
3584 .len = FIELD_SIZEOF(struct nft_data, data) },
3585 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
3589 * nft_data_init - parse nf_tables data netlink attributes
3591 * @ctx: context of the expression using the data
3592 * @data: destination struct nft_data
3593 * @desc: data description
3594 * @nla: netlink attribute containing data
3596 * Parse the netlink data attributes and initialize a struct nft_data.
3597 * The type and length of data are returned in the data description.
3599 * The caller can indicate that it only wants to accept data of type
3600 * NFT_DATA_VALUE by passing NULL for the ctx argument.
3602 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
3603 struct nft_data_desc *desc, const struct nlattr *nla)
3605 struct nlattr *tb[NFTA_DATA_MAX + 1];
3608 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
3612 if (tb[NFTA_DATA_VALUE])
3613 return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
3614 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
3615 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
3618 EXPORT_SYMBOL_GPL(nft_data_init);
3621 * nft_data_uninit - release a nft_data item
3623 * @data: struct nft_data to release
3624 * @type: type of data
3626 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
3627 * all others need to be released by calling this function.
3629 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
3632 case NFT_DATA_VALUE:
3634 case NFT_DATA_VERDICT:
3635 return nft_verdict_uninit(data);
3640 EXPORT_SYMBOL_GPL(nft_data_uninit);
3642 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
3643 enum nft_data_types type, unsigned int len)
3645 struct nlattr *nest;
3648 nest = nla_nest_start(skb, attr);
3653 case NFT_DATA_VALUE:
3654 err = nft_value_dump(skb, data, len);
3656 case NFT_DATA_VERDICT:
3657 err = nft_verdict_dump(skb, data);
3664 nla_nest_end(skb, nest);
3667 EXPORT_SYMBOL_GPL(nft_data_dump);
3669 static int nf_tables_init_net(struct net *net)
3671 INIT_LIST_HEAD(&net->nft.af_info);
3672 INIT_LIST_HEAD(&net->nft.commit_list);
3676 static struct pernet_operations nf_tables_net_ops = {
3677 .init = nf_tables_init_net,
3680 static int __init nf_tables_module_init(void)
3684 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
3691 err = nf_tables_core_module_init();
3695 err = nfnetlink_subsys_register(&nf_tables_subsys);
3699 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
3700 return register_pernet_subsys(&nf_tables_net_ops);
3702 nf_tables_core_module_exit();
3709 static void __exit nf_tables_module_exit(void)
3711 unregister_pernet_subsys(&nf_tables_net_ops);
3712 nfnetlink_subsys_unregister(&nf_tables_subsys);
3713 nf_tables_core_module_exit();
3717 module_init(nf_tables_module_init);
3718 module_exit(nf_tables_module_exit);
3720 MODULE_LICENSE("GPL");
3721 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
3722 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);