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 },
809 nf_tables_counters(struct nft_base_chain *chain, const struct nlattr *attr)
811 struct nlattr *tb[NFTA_COUNTER_MAX+1];
812 struct nft_stats __percpu *newstats;
813 struct nft_stats *stats;
816 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
820 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
823 newstats = alloc_percpu(struct nft_stats);
824 if (newstats == NULL)
827 /* Restore old counters on this cpu, no problem. Per-cpu statistics
828 * are not exposed to userspace.
830 stats = this_cpu_ptr(newstats);
831 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
832 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
835 struct nft_stats __percpu *oldstats =
836 nft_dereference(chain->stats);
838 rcu_assign_pointer(chain->stats, newstats);
840 free_percpu(oldstats);
842 rcu_assign_pointer(chain->stats, newstats);
847 static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
848 const struct nlmsghdr *nlh,
849 const struct nlattr * const nla[])
851 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
852 const struct nlattr * uninitialized_var(name);
853 struct nft_af_info *afi;
854 struct nft_table *table;
855 struct nft_chain *chain;
856 struct nft_base_chain *basechain = NULL;
857 struct nlattr *ha[NFTA_HOOK_MAX + 1];
858 struct net *net = sock_net(skb->sk);
859 int family = nfmsg->nfgen_family;
860 u8 policy = NF_ACCEPT;
866 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
868 afi = nf_tables_afinfo_lookup(net, family, true);
872 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
874 return PTR_ERR(table);
877 name = nla[NFTA_CHAIN_NAME];
879 if (nla[NFTA_CHAIN_HANDLE]) {
880 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
881 chain = nf_tables_chain_lookup_byhandle(table, handle);
883 return PTR_ERR(chain);
885 chain = nf_tables_chain_lookup(table, name);
887 if (PTR_ERR(chain) != -ENOENT)
888 return PTR_ERR(chain);
893 if (nla[NFTA_CHAIN_POLICY]) {
894 if ((chain != NULL &&
895 !(chain->flags & NFT_BASE_CHAIN)) ||
896 nla[NFTA_CHAIN_HOOK] == NULL)
899 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
910 if (nlh->nlmsg_flags & NLM_F_EXCL)
912 if (nlh->nlmsg_flags & NLM_F_REPLACE)
915 if (nla[NFTA_CHAIN_HANDLE] && name &&
916 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
919 if (nla[NFTA_CHAIN_COUNTERS]) {
920 if (!(chain->flags & NFT_BASE_CHAIN))
923 err = nf_tables_counters(nft_base_chain(chain),
924 nla[NFTA_CHAIN_COUNTERS]);
929 if (nla[NFTA_CHAIN_POLICY])
930 nft_base_chain(chain)->policy = policy;
932 if (nla[NFTA_CHAIN_HANDLE] && name)
933 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
938 if (table->use == UINT_MAX)
941 if (nla[NFTA_CHAIN_HOOK]) {
942 const struct nf_chain_type *type;
943 struct nf_hook_ops *ops;
945 u32 hooknum, priority;
947 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
948 if (nla[NFTA_CHAIN_TYPE]) {
949 type = nf_tables_chain_type_lookup(afi,
950 nla[NFTA_CHAIN_TYPE],
953 return PTR_ERR(type);
956 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
960 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
961 ha[NFTA_HOOK_PRIORITY] == NULL)
964 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
965 if (hooknum >= afi->nhooks)
967 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
969 if (!(type->hook_mask & (1 << hooknum)))
971 if (!try_module_get(type->owner))
973 hookfn = type->hooks[hooknum];
975 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
976 if (basechain == NULL)
979 if (nla[NFTA_CHAIN_COUNTERS]) {
980 err = nf_tables_counters(basechain,
981 nla[NFTA_CHAIN_COUNTERS]);
983 module_put(type->owner);
988 struct nft_stats __percpu *newstats;
990 newstats = alloc_percpu(struct nft_stats);
991 if (newstats == NULL) {
992 module_put(type->owner);
996 rcu_assign_pointer(basechain->stats, newstats);
999 basechain->type = type;
1000 chain = &basechain->chain;
1002 for (i = 0; i < afi->nops; i++) {
1003 ops = &basechain->ops[i];
1005 ops->owner = afi->owner;
1006 ops->hooknum = hooknum;
1007 ops->priority = priority;
1009 ops->hook = afi->hooks[ops->hooknum];
1012 if (afi->hook_ops_init)
1013 afi->hook_ops_init(ops, i);
1016 chain->flags |= NFT_BASE_CHAIN;
1017 basechain->policy = policy;
1019 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1024 INIT_LIST_HEAD(&chain->rules);
1025 chain->handle = nf_tables_alloc_handle(table);
1027 chain->table = table;
1028 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1030 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1031 chain->flags & NFT_BASE_CHAIN) {
1032 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
1034 module_put(basechain->type->owner);
1035 free_percpu(basechain->stats);
1040 list_add_tail(&chain->list, &table->chains);
1043 nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_NEWCHAIN,
1048 static void nf_tables_chain_destroy(struct nft_chain *chain)
1050 BUG_ON(chain->use > 0);
1052 if (chain->flags & NFT_BASE_CHAIN) {
1053 module_put(nft_base_chain(chain)->type->owner);
1054 free_percpu(nft_base_chain(chain)->stats);
1055 kfree(nft_base_chain(chain));
1060 static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
1061 const struct nlmsghdr *nlh,
1062 const struct nlattr * const nla[])
1064 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1065 struct nft_af_info *afi;
1066 struct nft_table *table;
1067 struct nft_chain *chain;
1068 struct net *net = sock_net(skb->sk);
1069 int family = nfmsg->nfgen_family;
1071 afi = nf_tables_afinfo_lookup(net, family, false);
1073 return PTR_ERR(afi);
1075 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1077 return PTR_ERR(table);
1079 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1081 return PTR_ERR(chain);
1083 if (!list_empty(&chain->rules) || chain->use > 0)
1086 list_del(&chain->list);
1089 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1090 chain->flags & NFT_BASE_CHAIN)
1091 nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops);
1093 nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_DELCHAIN,
1096 /* Make sure all rule references are gone before this is released */
1099 nf_tables_chain_destroy(chain);
1108 * nft_register_expr - register nf_tables expr type
1111 * Registers the expr type for use with nf_tables. Returns zero on
1112 * success or a negative errno code otherwise.
1114 int nft_register_expr(struct nft_expr_type *type)
1116 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1117 if (type->family == NFPROTO_UNSPEC)
1118 list_add_tail(&type->list, &nf_tables_expressions);
1120 list_add(&type->list, &nf_tables_expressions);
1121 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1124 EXPORT_SYMBOL_GPL(nft_register_expr);
1127 * nft_unregister_expr - unregister nf_tables expr type
1130 * Unregisters the expr typefor use with nf_tables.
1132 void nft_unregister_expr(struct nft_expr_type *type)
1134 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1135 list_del(&type->list);
1136 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1138 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1140 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1143 const struct nft_expr_type *type;
1145 list_for_each_entry(type, &nf_tables_expressions, list) {
1146 if (!nla_strcmp(nla, type->name) &&
1147 (!type->family || type->family == family))
1153 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1156 const struct nft_expr_type *type;
1159 return ERR_PTR(-EINVAL);
1161 type = __nft_expr_type_get(family, nla);
1162 if (type != NULL && try_module_get(type->owner))
1165 #ifdef CONFIG_MODULES
1167 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1168 request_module("nft-expr-%u-%.*s", family,
1169 nla_len(nla), (char *)nla_data(nla));
1170 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1171 if (__nft_expr_type_get(family, nla))
1172 return ERR_PTR(-EAGAIN);
1174 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1175 request_module("nft-expr-%.*s",
1176 nla_len(nla), (char *)nla_data(nla));
1177 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1178 if (__nft_expr_type_get(family, nla))
1179 return ERR_PTR(-EAGAIN);
1182 return ERR_PTR(-ENOENT);
1185 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1186 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1187 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1190 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1191 const struct nft_expr *expr)
1193 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1194 goto nla_put_failure;
1196 if (expr->ops->dump) {
1197 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1199 goto nla_put_failure;
1200 if (expr->ops->dump(skb, expr) < 0)
1201 goto nla_put_failure;
1202 nla_nest_end(skb, data);
1211 struct nft_expr_info {
1212 const struct nft_expr_ops *ops;
1213 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1216 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1217 const struct nlattr *nla,
1218 struct nft_expr_info *info)
1220 const struct nft_expr_type *type;
1221 const struct nft_expr_ops *ops;
1222 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1225 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1229 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1231 return PTR_ERR(type);
1233 if (tb[NFTA_EXPR_DATA]) {
1234 err = nla_parse_nested(info->tb, type->maxattr,
1235 tb[NFTA_EXPR_DATA], type->policy);
1239 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1241 if (type->select_ops != NULL) {
1242 ops = type->select_ops(ctx,
1243 (const struct nlattr * const *)info->tb);
1255 module_put(type->owner);
1259 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1260 const struct nft_expr_info *info,
1261 struct nft_expr *expr)
1263 const struct nft_expr_ops *ops = info->ops;
1268 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1280 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1281 struct nft_expr *expr)
1283 if (expr->ops->destroy)
1284 expr->ops->destroy(ctx, expr);
1285 module_put(expr->ops->type->owner);
1292 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1295 struct nft_rule *rule;
1297 // FIXME: this sucks
1298 list_for_each_entry(rule, &chain->rules, list) {
1299 if (handle == rule->handle)
1303 return ERR_PTR(-ENOENT);
1306 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1307 const struct nlattr *nla)
1310 return ERR_PTR(-EINVAL);
1312 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1315 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1316 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1317 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1318 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1319 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1320 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1321 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1322 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1323 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1324 .len = NFT_USERDATA_MAXLEN },
1327 static int nf_tables_fill_rule_info(struct sk_buff *skb, u32 portid, u32 seq,
1328 int event, u32 flags, int family,
1329 const struct nft_table *table,
1330 const struct nft_chain *chain,
1331 const struct nft_rule *rule)
1333 struct nlmsghdr *nlh;
1334 struct nfgenmsg *nfmsg;
1335 const struct nft_expr *expr, *next;
1336 struct nlattr *list;
1337 const struct nft_rule *prule;
1338 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1340 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1343 goto nla_put_failure;
1345 nfmsg = nlmsg_data(nlh);
1346 nfmsg->nfgen_family = family;
1347 nfmsg->version = NFNETLINK_V0;
1350 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1351 goto nla_put_failure;
1352 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1353 goto nla_put_failure;
1354 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle)))
1355 goto nla_put_failure;
1357 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1358 prule = list_entry(rule->list.prev, struct nft_rule, list);
1359 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1360 cpu_to_be64(prule->handle)))
1361 goto nla_put_failure;
1364 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1366 goto nla_put_failure;
1367 nft_rule_for_each_expr(expr, next, rule) {
1368 struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM);
1370 goto nla_put_failure;
1371 if (nf_tables_fill_expr_info(skb, expr) < 0)
1372 goto nla_put_failure;
1373 nla_nest_end(skb, elem);
1375 nla_nest_end(skb, list);
1378 nla_put(skb, NFTA_RULE_USERDATA, rule->ulen, nft_userdata(rule)))
1379 goto nla_put_failure;
1381 return nlmsg_end(skb, nlh);
1384 nlmsg_trim(skb, nlh);
1388 static int nf_tables_rule_notify(const struct sk_buff *oskb,
1389 const struct nlmsghdr *nlh,
1390 const struct nft_table *table,
1391 const struct nft_chain *chain,
1392 const struct nft_rule *rule,
1393 int event, u32 flags, int family)
1395 struct sk_buff *skb;
1396 u32 portid = NETLINK_CB(oskb).portid;
1397 struct net *net = oskb ? sock_net(oskb->sk) : &init_net;
1398 u32 seq = nlh->nlmsg_seq;
1402 report = nlmsg_report(nlh);
1403 if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
1407 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1411 err = nf_tables_fill_rule_info(skb, portid, seq, event, flags,
1412 family, table, chain, rule);
1418 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report,
1422 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
1427 nft_rule_is_active(struct net *net, const struct nft_rule *rule)
1429 return (rule->genmask & (1 << net->nft.gencursor)) == 0;
1432 static inline int gencursor_next(struct net *net)
1434 return net->nft.gencursor+1 == 1 ? 1 : 0;
1438 nft_rule_is_active_next(struct net *net, const struct nft_rule *rule)
1440 return (rule->genmask & (1 << gencursor_next(net))) == 0;
1444 nft_rule_activate_next(struct net *net, struct nft_rule *rule)
1446 /* Now inactive, will be active in the future */
1447 rule->genmask = (1 << net->nft.gencursor);
1451 nft_rule_disactivate_next(struct net *net, struct nft_rule *rule)
1453 rule->genmask = (1 << gencursor_next(net));
1456 static inline void nft_rule_clear(struct net *net, struct nft_rule *rule)
1461 static int nf_tables_dump_rules(struct sk_buff *skb,
1462 struct netlink_callback *cb)
1464 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1465 const struct nft_af_info *afi;
1466 const struct nft_table *table;
1467 const struct nft_chain *chain;
1468 const struct nft_rule *rule;
1469 unsigned int idx = 0, s_idx = cb->args[0];
1470 struct net *net = sock_net(skb->sk);
1471 int family = nfmsg->nfgen_family;
1472 u8 genctr = ACCESS_ONCE(net->nft.genctr);
1473 u8 gencursor = ACCESS_ONCE(net->nft.gencursor);
1475 list_for_each_entry(afi, &net->nft.af_info, list) {
1476 if (family != NFPROTO_UNSPEC && family != afi->family)
1479 list_for_each_entry(table, &afi->tables, list) {
1480 list_for_each_entry(chain, &table->chains, list) {
1481 list_for_each_entry(rule, &chain->rules, list) {
1482 if (!nft_rule_is_active(net, rule))
1487 memset(&cb->args[1], 0,
1488 sizeof(cb->args) - sizeof(cb->args[0]));
1489 if (nf_tables_fill_rule_info(skb, NETLINK_CB(cb->skb).portid,
1492 NLM_F_MULTI | NLM_F_APPEND,
1493 afi->family, table, chain, rule) < 0)
1502 /* Invalidate this dump, a transition to the new generation happened */
1503 if (gencursor != net->nft.gencursor || genctr != net->nft.genctr)
1510 static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
1511 const struct nlmsghdr *nlh,
1512 const struct nlattr * const nla[])
1514 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1515 const struct nft_af_info *afi;
1516 const struct nft_table *table;
1517 const struct nft_chain *chain;
1518 const struct nft_rule *rule;
1519 struct sk_buff *skb2;
1520 struct net *net = sock_net(skb->sk);
1521 int family = nfmsg->nfgen_family;
1524 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1525 struct netlink_dump_control c = {
1526 .dump = nf_tables_dump_rules,
1528 return netlink_dump_start(nlsk, skb, nlh, &c);
1531 afi = nf_tables_afinfo_lookup(net, family, false);
1533 return PTR_ERR(afi);
1535 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1537 return PTR_ERR(table);
1539 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1541 return PTR_ERR(chain);
1543 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1545 return PTR_ERR(rule);
1547 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1551 err = nf_tables_fill_rule_info(skb2, NETLINK_CB(skb).portid,
1552 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1553 family, table, chain, rule);
1557 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1564 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1565 struct nft_rule *rule)
1567 struct nft_expr *expr;
1570 * Careful: some expressions might not be initialized in case this
1571 * is called on error from nf_tables_newrule().
1573 expr = nft_expr_first(rule);
1574 while (expr->ops && expr != nft_expr_last(rule)) {
1575 nf_tables_expr_destroy(ctx, expr);
1576 expr = nft_expr_next(expr);
1581 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
1582 struct nft_rule *rule)
1584 struct nft_trans *trans;
1586 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
1590 nft_trans_rule(trans) = rule;
1591 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1596 #define NFT_RULE_MAXEXPRS 128
1598 static struct nft_expr_info *info;
1600 static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
1601 const struct nlmsghdr *nlh,
1602 const struct nlattr * const nla[])
1604 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1605 struct nft_af_info *afi;
1606 struct net *net = sock_net(skb->sk);
1607 struct nft_table *table;
1608 struct nft_chain *chain;
1609 struct nft_rule *rule, *old_rule = NULL;
1610 struct nft_trans *trans = NULL;
1611 struct nft_expr *expr;
1614 unsigned int size, i, n, ulen = 0;
1617 u64 handle, pos_handle;
1619 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1621 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
1623 return PTR_ERR(afi);
1625 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1627 return PTR_ERR(table);
1629 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1631 return PTR_ERR(chain);
1633 if (nla[NFTA_RULE_HANDLE]) {
1634 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
1635 rule = __nf_tables_rule_lookup(chain, handle);
1637 return PTR_ERR(rule);
1639 if (nlh->nlmsg_flags & NLM_F_EXCL)
1641 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1646 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
1648 handle = nf_tables_alloc_handle(table);
1651 if (nla[NFTA_RULE_POSITION]) {
1652 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1655 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
1656 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
1657 if (IS_ERR(old_rule))
1658 return PTR_ERR(old_rule);
1661 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1665 if (nla[NFTA_RULE_EXPRESSIONS]) {
1666 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
1668 if (nla_type(tmp) != NFTA_LIST_ELEM)
1670 if (n == NFT_RULE_MAXEXPRS)
1672 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
1675 size += info[n].ops->size;
1680 if (nla[NFTA_RULE_USERDATA])
1681 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
1684 rule = kzalloc(sizeof(*rule) + size + ulen, GFP_KERNEL);
1688 nft_rule_activate_next(net, rule);
1690 rule->handle = handle;
1695 nla_memcpy(nft_userdata(rule), nla[NFTA_RULE_USERDATA], ulen);
1697 expr = nft_expr_first(rule);
1698 for (i = 0; i < n; i++) {
1699 err = nf_tables_newexpr(&ctx, &info[i], expr);
1703 expr = nft_expr_next(expr);
1706 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
1707 if (nft_rule_is_active_next(net, old_rule)) {
1708 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE,
1710 if (trans == NULL) {
1714 nft_rule_disactivate_next(net, old_rule);
1715 list_add_tail(&rule->list, &old_rule->list);
1720 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
1722 list_add_rcu(&rule->list, &old_rule->list);
1724 list_add_tail_rcu(&rule->list, &chain->rules);
1727 list_add_tail_rcu(&rule->list, &old_rule->list);
1729 list_add_rcu(&rule->list, &chain->rules);
1732 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
1739 list_del_rcu(&rule->list);
1741 list_del_rcu(&nft_trans_rule(trans)->list);
1742 nft_rule_clear(net, nft_trans_rule(trans));
1743 nft_trans_destroy(trans);
1746 nf_tables_rule_destroy(&ctx, rule);
1748 for (i = 0; i < n; i++) {
1749 if (info[i].ops != NULL)
1750 module_put(info[i].ops->type->owner);
1756 nf_tables_delrule_one(struct nft_ctx *ctx, struct nft_rule *rule)
1758 /* You cannot delete the same rule twice */
1759 if (nft_rule_is_active_next(ctx->net, rule)) {
1760 if (nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule) == NULL)
1762 nft_rule_disactivate_next(ctx->net, rule);
1768 static int nf_table_delrule_by_chain(struct nft_ctx *ctx)
1770 struct nft_rule *rule;
1773 list_for_each_entry(rule, &ctx->chain->rules, list) {
1774 err = nf_tables_delrule_one(ctx, rule);
1781 static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
1782 const struct nlmsghdr *nlh,
1783 const struct nlattr * const nla[])
1785 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1786 struct nft_af_info *afi;
1787 struct net *net = sock_net(skb->sk);
1788 struct nft_table *table;
1789 struct nft_chain *chain = NULL;
1790 struct nft_rule *rule;
1791 int family = nfmsg->nfgen_family, err = 0;
1794 afi = nf_tables_afinfo_lookup(net, family, false);
1796 return PTR_ERR(afi);
1798 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1800 return PTR_ERR(table);
1802 if (nla[NFTA_RULE_CHAIN]) {
1803 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1805 return PTR_ERR(chain);
1808 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1811 if (nla[NFTA_RULE_HANDLE]) {
1812 rule = nf_tables_rule_lookup(chain,
1813 nla[NFTA_RULE_HANDLE]);
1815 return PTR_ERR(rule);
1817 err = nf_tables_delrule_one(&ctx, rule);
1819 err = nf_table_delrule_by_chain(&ctx);
1822 list_for_each_entry(chain, &table->chains, list) {
1824 err = nf_table_delrule_by_chain(&ctx);
1837 static LIST_HEAD(nf_tables_set_ops);
1839 int nft_register_set(struct nft_set_ops *ops)
1841 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1842 list_add_tail(&ops->list, &nf_tables_set_ops);
1843 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1846 EXPORT_SYMBOL_GPL(nft_register_set);
1848 void nft_unregister_set(struct nft_set_ops *ops)
1850 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1851 list_del(&ops->list);
1852 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1854 EXPORT_SYMBOL_GPL(nft_unregister_set);
1857 * Select a set implementation based on the data characteristics and the
1858 * given policy. The total memory use might not be known if no size is
1859 * given, in that case the amount of memory per element is used.
1861 static const struct nft_set_ops *
1862 nft_select_set_ops(const struct nlattr * const nla[],
1863 const struct nft_set_desc *desc,
1864 enum nft_set_policies policy)
1866 const struct nft_set_ops *ops, *bops;
1867 struct nft_set_estimate est, best;
1870 #ifdef CONFIG_MODULES
1871 if (list_empty(&nf_tables_set_ops)) {
1872 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1873 request_module("nft-set");
1874 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1875 if (!list_empty(&nf_tables_set_ops))
1876 return ERR_PTR(-EAGAIN);
1880 if (nla[NFTA_SET_FLAGS] != NULL) {
1881 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
1882 features &= NFT_SET_INTERVAL | NFT_SET_MAP;
1889 list_for_each_entry(ops, &nf_tables_set_ops, list) {
1890 if ((ops->features & features) != features)
1892 if (!ops->estimate(desc, features, &est))
1896 case NFT_SET_POL_PERFORMANCE:
1897 if (est.class < best.class)
1899 if (est.class == best.class && est.size < best.size)
1902 case NFT_SET_POL_MEMORY:
1903 if (est.size < best.size)
1905 if (est.size == best.size && est.class < best.class)
1912 if (!try_module_get(ops->owner))
1915 module_put(bops->owner);
1924 return ERR_PTR(-EOPNOTSUPP);
1927 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
1928 [NFTA_SET_TABLE] = { .type = NLA_STRING },
1929 [NFTA_SET_NAME] = { .type = NLA_STRING },
1930 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
1931 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
1932 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
1933 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
1934 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
1935 [NFTA_SET_POLICY] = { .type = NLA_U32 },
1936 [NFTA_SET_DESC] = { .type = NLA_NESTED },
1937 [NFTA_SET_ID] = { .type = NLA_U32 },
1940 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
1941 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
1944 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx,
1945 const struct sk_buff *skb,
1946 const struct nlmsghdr *nlh,
1947 const struct nlattr * const nla[])
1949 struct net *net = sock_net(skb->sk);
1950 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1951 struct nft_af_info *afi = NULL;
1952 struct nft_table *table = NULL;
1954 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
1955 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
1957 return PTR_ERR(afi);
1960 if (nla[NFTA_SET_TABLE] != NULL) {
1962 return -EAFNOSUPPORT;
1964 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
1966 return PTR_ERR(table);
1969 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
1973 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
1974 const struct nlattr *nla)
1976 struct nft_set *set;
1979 return ERR_PTR(-EINVAL);
1981 list_for_each_entry(set, &table->sets, list) {
1982 if (!nla_strcmp(nla, set->name))
1985 return ERR_PTR(-ENOENT);
1988 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
1989 const struct nlattr *nla)
1991 struct nft_trans *trans;
1992 u32 id = ntohl(nla_get_be32(nla));
1994 list_for_each_entry(trans, &net->nft.commit_list, list) {
1995 if (trans->msg_type == NFT_MSG_NEWSET &&
1996 id == nft_trans_set_id(trans))
1997 return nft_trans_set(trans);
1999 return ERR_PTR(-ENOENT);
2002 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2005 const struct nft_set *i;
2007 unsigned long *inuse;
2008 unsigned int n = 0, min = 0;
2010 p = strnchr(name, IFNAMSIZ, '%');
2012 if (p[1] != 'd' || strchr(p + 2, '%'))
2015 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2019 list_for_each_entry(i, &ctx->table->sets, list) {
2022 if (!sscanf(i->name, name, &tmp))
2024 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2027 set_bit(tmp - min, inuse);
2030 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2031 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2032 min += BITS_PER_BYTE * PAGE_SIZE;
2033 memset(inuse, 0, PAGE_SIZE);
2036 free_page((unsigned long)inuse);
2039 snprintf(set->name, sizeof(set->name), name, min + n);
2040 list_for_each_entry(i, &ctx->table->sets, list) {
2041 if (!strcmp(set->name, i->name))
2047 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2048 const struct nft_set *set, u16 event, u16 flags)
2050 struct nfgenmsg *nfmsg;
2051 struct nlmsghdr *nlh;
2052 struct nlattr *desc;
2053 u32 portid = NETLINK_CB(ctx->skb).portid;
2054 u32 seq = ctx->nlh->nlmsg_seq;
2056 event |= NFNL_SUBSYS_NFTABLES << 8;
2057 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2060 goto nla_put_failure;
2062 nfmsg = nlmsg_data(nlh);
2063 nfmsg->nfgen_family = ctx->afi->family;
2064 nfmsg->version = NFNETLINK_V0;
2067 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2068 goto nla_put_failure;
2069 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2070 goto nla_put_failure;
2071 if (set->flags != 0)
2072 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2073 goto nla_put_failure;
2075 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2076 goto nla_put_failure;
2077 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2078 goto nla_put_failure;
2079 if (set->flags & NFT_SET_MAP) {
2080 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2081 goto nla_put_failure;
2082 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2083 goto nla_put_failure;
2086 desc = nla_nest_start(skb, NFTA_SET_DESC);
2088 goto nla_put_failure;
2090 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2091 goto nla_put_failure;
2092 nla_nest_end(skb, desc);
2094 return nlmsg_end(skb, nlh);
2097 nlmsg_trim(skb, nlh);
2101 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2102 const struct nft_set *set,
2105 struct sk_buff *skb;
2106 u32 portid = NETLINK_CB(ctx->skb).portid;
2110 report = nlmsg_report(ctx->nlh);
2111 if (!report && !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2115 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2119 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2125 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, report,
2129 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2133 static int nf_tables_dump_sets_table(struct nft_ctx *ctx, struct sk_buff *skb,
2134 struct netlink_callback *cb)
2136 const struct nft_set *set;
2137 unsigned int idx = 0, s_idx = cb->args[0];
2142 list_for_each_entry(set, &ctx->table->sets, list) {
2145 if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET,
2158 static int nf_tables_dump_sets_family(struct nft_ctx *ctx, struct sk_buff *skb,
2159 struct netlink_callback *cb)
2161 const struct nft_set *set;
2162 unsigned int idx, s_idx = cb->args[0];
2163 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2168 list_for_each_entry(table, &ctx->afi->tables, list) {
2170 if (cur_table != table)
2177 list_for_each_entry(set, &ctx->table->sets, list) {
2180 if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET,
2183 cb->args[2] = (unsigned long) table;
2195 static int nf_tables_dump_sets_all(struct nft_ctx *ctx, struct sk_buff *skb,
2196 struct netlink_callback *cb)
2198 const struct nft_set *set;
2199 unsigned int idx, s_idx = cb->args[0];
2200 struct nft_af_info *afi;
2201 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2202 struct net *net = sock_net(skb->sk);
2203 int cur_family = cb->args[3];
2208 list_for_each_entry(afi, &net->nft.af_info, list) {
2210 if (afi->family != cur_family)
2216 list_for_each_entry(table, &afi->tables, list) {
2218 if (cur_table != table)
2227 list_for_each_entry(set, &ctx->table->sets, list) {
2230 if (nf_tables_fill_set(skb, ctx, set,
2234 cb->args[2] = (unsigned long) table;
2235 cb->args[3] = afi->family;
2250 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2252 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2253 struct nlattr *nla[NFTA_SET_MAX + 1];
2257 err = nlmsg_parse(cb->nlh, sizeof(*nfmsg), nla, NFTA_SET_MAX,
2262 err = nft_ctx_init_from_setattr(&ctx, cb->skb, cb->nlh, (void *)nla);
2266 if (ctx.table == NULL) {
2267 if (ctx.afi == NULL)
2268 ret = nf_tables_dump_sets_all(&ctx, skb, cb);
2270 ret = nf_tables_dump_sets_family(&ctx, skb, cb);
2272 ret = nf_tables_dump_sets_table(&ctx, skb, cb);
2277 #define NFT_SET_INACTIVE (1 << 15) /* Internal set flag */
2279 static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
2280 const struct nlmsghdr *nlh,
2281 const struct nlattr * const nla[])
2283 const struct nft_set *set;
2285 struct sk_buff *skb2;
2286 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2289 /* Verify existance before starting dump */
2290 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2294 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2295 struct netlink_dump_control c = {
2296 .dump = nf_tables_dump_sets,
2298 return netlink_dump_start(nlsk, skb, nlh, &c);
2301 /* Only accept unspec with dump */
2302 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2303 return -EAFNOSUPPORT;
2305 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2307 return PTR_ERR(set);
2308 if (set->flags & NFT_SET_INACTIVE)
2311 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2315 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2319 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2326 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2327 struct nft_set_desc *desc,
2328 const struct nlattr *nla)
2330 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2333 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2337 if (da[NFTA_SET_DESC_SIZE] != NULL)
2338 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2343 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
2344 struct nft_set *set)
2346 struct nft_trans *trans;
2348 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
2352 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
2353 nft_trans_set_id(trans) =
2354 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
2355 set->flags |= NFT_SET_INACTIVE;
2357 nft_trans_set(trans) = set;
2358 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2363 static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
2364 const struct nlmsghdr *nlh,
2365 const struct nlattr * const nla[])
2367 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2368 const struct nft_set_ops *ops;
2369 struct nft_af_info *afi;
2370 struct net *net = sock_net(skb->sk);
2371 struct nft_table *table;
2372 struct nft_set *set;
2374 char name[IFNAMSIZ];
2377 u32 ktype, dtype, flags, policy;
2378 struct nft_set_desc desc;
2381 if (nla[NFTA_SET_TABLE] == NULL ||
2382 nla[NFTA_SET_NAME] == NULL ||
2383 nla[NFTA_SET_KEY_LEN] == NULL ||
2384 nla[NFTA_SET_ID] == NULL)
2387 memset(&desc, 0, sizeof(desc));
2389 ktype = NFT_DATA_VALUE;
2390 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2391 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2392 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2396 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2397 if (desc.klen == 0 || desc.klen > FIELD_SIZEOF(struct nft_data, data))
2401 if (nla[NFTA_SET_FLAGS] != NULL) {
2402 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2403 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2404 NFT_SET_INTERVAL | NFT_SET_MAP))
2409 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2410 if (!(flags & NFT_SET_MAP))
2413 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2414 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2415 dtype != NFT_DATA_VERDICT)
2418 if (dtype != NFT_DATA_VERDICT) {
2419 if (nla[NFTA_SET_DATA_LEN] == NULL)
2421 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2422 if (desc.dlen == 0 ||
2423 desc.dlen > FIELD_SIZEOF(struct nft_data, data))
2426 desc.dlen = sizeof(struct nft_data);
2427 } else if (flags & NFT_SET_MAP)
2430 policy = NFT_SET_POL_PERFORMANCE;
2431 if (nla[NFTA_SET_POLICY] != NULL)
2432 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2434 if (nla[NFTA_SET_DESC] != NULL) {
2435 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2440 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2442 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2444 return PTR_ERR(afi);
2446 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2448 return PTR_ERR(table);
2450 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
2452 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2454 if (PTR_ERR(set) != -ENOENT)
2455 return PTR_ERR(set);
2460 if (nlh->nlmsg_flags & NLM_F_EXCL)
2462 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2467 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2470 ops = nft_select_set_ops(nla, &desc, policy);
2472 return PTR_ERR(ops);
2475 if (ops->privsize != NULL)
2476 size = ops->privsize(nla);
2479 set = kzalloc(sizeof(*set) + size, GFP_KERNEL);
2483 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2484 err = nf_tables_set_alloc_name(&ctx, set, name);
2488 INIT_LIST_HEAD(&set->bindings);
2491 set->klen = desc.klen;
2493 set->dlen = desc.dlen;
2495 set->size = desc.size;
2497 err = ops->init(set, &desc, nla);
2501 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2505 list_add_tail(&set->list, &table->sets);
2511 module_put(ops->owner);
2515 static void nft_set_destroy(struct nft_set *set)
2517 set->ops->destroy(set);
2518 module_put(set->ops->owner);
2522 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2524 list_del(&set->list);
2525 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET);
2526 nft_set_destroy(set);
2529 static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
2530 const struct nlmsghdr *nlh,
2531 const struct nlattr * const nla[])
2533 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2534 struct nft_set *set;
2538 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2539 return -EAFNOSUPPORT;
2540 if (nla[NFTA_SET_TABLE] == NULL)
2543 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2547 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2549 return PTR_ERR(set);
2550 if (set->flags & NFT_SET_INACTIVE)
2552 if (!list_empty(&set->bindings))
2555 err = nft_trans_set_add(&ctx, NFT_MSG_DELSET, set);
2559 list_del(&set->list);
2563 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2564 const struct nft_set *set,
2565 const struct nft_set_iter *iter,
2566 const struct nft_set_elem *elem)
2568 enum nft_registers dreg;
2570 dreg = nft_type_to_reg(set->dtype);
2571 return nft_validate_data_load(ctx, dreg, &elem->data,
2572 set->dtype == NFT_DATA_VERDICT ?
2573 NFT_DATA_VERDICT : NFT_DATA_VALUE);
2576 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2577 struct nft_set_binding *binding)
2579 struct nft_set_binding *i;
2580 struct nft_set_iter iter;
2582 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2585 if (set->flags & NFT_SET_MAP) {
2586 /* If the set is already bound to the same chain all
2587 * jumps are already validated for that chain.
2589 list_for_each_entry(i, &set->bindings, list) {
2590 if (i->chain == binding->chain)
2597 iter.fn = nf_tables_bind_check_setelem;
2599 set->ops->walk(ctx, set, &iter);
2601 /* Destroy anonymous sets if binding fails */
2602 if (set->flags & NFT_SET_ANONYMOUS)
2603 nf_tables_set_destroy(ctx, set);
2609 binding->chain = ctx->chain;
2610 list_add_tail(&binding->list, &set->bindings);
2614 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2615 struct nft_set_binding *binding)
2617 list_del(&binding->list);
2619 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2620 !(set->flags & NFT_SET_INACTIVE))
2621 nf_tables_set_destroy(ctx, set);
2628 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
2629 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
2630 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
2631 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
2634 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
2635 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
2636 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
2637 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
2638 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
2641 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx,
2642 const struct sk_buff *skb,
2643 const struct nlmsghdr *nlh,
2644 const struct nlattr * const nla[])
2646 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2647 struct nft_af_info *afi;
2648 struct nft_table *table;
2649 struct net *net = sock_net(skb->sk);
2651 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2653 return PTR_ERR(afi);
2655 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
2657 return PTR_ERR(table);
2659 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2663 static int nf_tables_fill_setelem(struct sk_buff *skb,
2664 const struct nft_set *set,
2665 const struct nft_set_elem *elem)
2667 unsigned char *b = skb_tail_pointer(skb);
2668 struct nlattr *nest;
2670 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
2672 goto nla_put_failure;
2674 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE,
2676 goto nla_put_failure;
2678 if (set->flags & NFT_SET_MAP &&
2679 !(elem->flags & NFT_SET_ELEM_INTERVAL_END) &&
2680 nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data,
2681 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
2683 goto nla_put_failure;
2685 if (elem->flags != 0)
2686 if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags)))
2687 goto nla_put_failure;
2689 nla_nest_end(skb, nest);
2697 struct nft_set_dump_args {
2698 const struct netlink_callback *cb;
2699 struct nft_set_iter iter;
2700 struct sk_buff *skb;
2703 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
2704 const struct nft_set *set,
2705 const struct nft_set_iter *iter,
2706 const struct nft_set_elem *elem)
2708 struct nft_set_dump_args *args;
2710 args = container_of(iter, struct nft_set_dump_args, iter);
2711 return nf_tables_fill_setelem(args->skb, set, elem);
2714 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
2716 const struct nft_set *set;
2717 struct nft_set_dump_args args;
2719 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
2720 struct nfgenmsg *nfmsg;
2721 struct nlmsghdr *nlh;
2722 struct nlattr *nest;
2726 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
2727 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
2731 err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla);
2735 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2737 return PTR_ERR(set);
2738 if (set->flags & NFT_SET_INACTIVE)
2741 event = NFT_MSG_NEWSETELEM;
2742 event |= NFNL_SUBSYS_NFTABLES << 8;
2743 portid = NETLINK_CB(cb->skb).portid;
2744 seq = cb->nlh->nlmsg_seq;
2746 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2749 goto nla_put_failure;
2751 nfmsg = nlmsg_data(nlh);
2752 nfmsg->nfgen_family = NFPROTO_UNSPEC;
2753 nfmsg->version = NFNETLINK_V0;
2756 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
2757 goto nla_put_failure;
2758 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
2759 goto nla_put_failure;
2761 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2763 goto nla_put_failure;
2767 args.iter.skip = cb->args[0];
2768 args.iter.count = 0;
2770 args.iter.fn = nf_tables_dump_setelem;
2771 set->ops->walk(&ctx, set, &args.iter);
2773 nla_nest_end(skb, nest);
2774 nlmsg_end(skb, nlh);
2776 if (args.iter.err && args.iter.err != -EMSGSIZE)
2777 return args.iter.err;
2778 if (args.iter.count == cb->args[0])
2781 cb->args[0] = args.iter.count;
2788 static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb,
2789 const struct nlmsghdr *nlh,
2790 const struct nlattr * const nla[])
2792 const struct nft_set *set;
2796 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla);
2800 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2802 return PTR_ERR(set);
2803 if (set->flags & NFT_SET_INACTIVE)
2806 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2807 struct netlink_dump_control c = {
2808 .dump = nf_tables_dump_set,
2810 return netlink_dump_start(nlsk, skb, nlh, &c);
2815 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
2816 const struct nft_ctx *ctx, u32 seq,
2817 u32 portid, int event, u16 flags,
2818 const struct nft_set *set,
2819 const struct nft_set_elem *elem)
2821 struct nfgenmsg *nfmsg;
2822 struct nlmsghdr *nlh;
2823 struct nlattr *nest;
2826 event |= NFNL_SUBSYS_NFTABLES << 8;
2827 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2830 goto nla_put_failure;
2832 nfmsg = nlmsg_data(nlh);
2833 nfmsg->nfgen_family = ctx->afi->family;
2834 nfmsg->version = NFNETLINK_V0;
2837 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2838 goto nla_put_failure;
2839 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2840 goto nla_put_failure;
2842 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2844 goto nla_put_failure;
2846 err = nf_tables_fill_setelem(skb, set, elem);
2848 goto nla_put_failure;
2850 nla_nest_end(skb, nest);
2852 return nlmsg_end(skb, nlh);
2855 nlmsg_trim(skb, nlh);
2859 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
2860 const struct nft_set *set,
2861 const struct nft_set_elem *elem,
2862 int event, u16 flags)
2864 const struct sk_buff *oskb = ctx->skb;
2865 struct net *net = sock_net(oskb->sk);
2866 u32 portid = NETLINK_CB(oskb).portid;
2867 bool report = nlmsg_report(ctx->nlh);
2868 struct sk_buff *skb;
2871 if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
2875 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2879 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
2886 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report,
2890 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
2894 static int nft_add_set_elem(const struct nft_ctx *ctx, struct nft_set *set,
2895 const struct nlattr *attr)
2897 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
2898 struct nft_data_desc d1, d2;
2899 struct nft_set_elem elem;
2900 struct nft_set_binding *binding;
2901 enum nft_registers dreg;
2904 if (set->size && set->nelems == set->size)
2907 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
2908 nft_set_elem_policy);
2912 if (nla[NFTA_SET_ELEM_KEY] == NULL)
2916 if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
2917 elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
2918 if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END)
2922 if (set->flags & NFT_SET_MAP) {
2923 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
2924 !(elem.flags & NFT_SET_ELEM_INTERVAL_END))
2926 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
2927 elem.flags & NFT_SET_ELEM_INTERVAL_END)
2930 if (nla[NFTA_SET_ELEM_DATA] != NULL)
2934 err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]);
2938 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
2942 if (set->ops->get(set, &elem) == 0)
2945 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
2946 err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]);
2951 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
2954 dreg = nft_type_to_reg(set->dtype);
2955 list_for_each_entry(binding, &set->bindings, list) {
2956 struct nft_ctx bind_ctx = {
2958 .table = ctx->table,
2959 .chain = (struct nft_chain *)binding->chain,
2962 err = nft_validate_data_load(&bind_ctx, dreg,
2963 &elem.data, d2.type);
2969 err = set->ops->insert(set, &elem);
2974 nf_tables_setelem_notify(ctx, set, &elem, NFT_MSG_NEWSETELEM, 0);
2978 if (nla[NFTA_SET_ELEM_DATA] != NULL)
2979 nft_data_uninit(&elem.data, d2.type);
2981 nft_data_uninit(&elem.key, d1.type);
2986 static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb,
2987 const struct nlmsghdr *nlh,
2988 const struct nlattr * const nla[])
2990 struct net *net = sock_net(skb->sk);
2991 const struct nlattr *attr;
2992 struct nft_set *set;
2996 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla);
3000 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3002 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3003 set = nf_tables_set_lookup_byid(net,
3004 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3007 return PTR_ERR(set);
3010 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3013 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3014 err = nft_add_set_elem(&ctx, set, attr);
3021 static int nft_del_setelem(const struct nft_ctx *ctx, struct nft_set *set,
3022 const struct nlattr *attr)
3024 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3025 struct nft_data_desc desc;
3026 struct nft_set_elem elem;
3029 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3030 nft_set_elem_policy);
3035 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3038 err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]);
3043 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3046 err = set->ops->get(set, &elem);
3050 set->ops->remove(set, &elem);
3053 nf_tables_setelem_notify(ctx, set, &elem, NFT_MSG_DELSETELEM, 0);
3055 nft_data_uninit(&elem.key, NFT_DATA_VALUE);
3056 if (set->flags & NFT_SET_MAP)
3057 nft_data_uninit(&elem.data, set->dtype);
3060 nft_data_uninit(&elem.key, desc.type);
3065 static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb,
3066 const struct nlmsghdr *nlh,
3067 const struct nlattr * const nla[])
3069 const struct nlattr *attr;
3070 struct nft_set *set;
3074 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla);
3078 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3080 return PTR_ERR(set);
3081 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3084 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3085 err = nft_del_setelem(&ctx, set, attr);
3092 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3093 [NFT_MSG_NEWTABLE] = {
3094 .call = nf_tables_newtable,
3095 .attr_count = NFTA_TABLE_MAX,
3096 .policy = nft_table_policy,
3098 [NFT_MSG_GETTABLE] = {
3099 .call = nf_tables_gettable,
3100 .attr_count = NFTA_TABLE_MAX,
3101 .policy = nft_table_policy,
3103 [NFT_MSG_DELTABLE] = {
3104 .call = nf_tables_deltable,
3105 .attr_count = NFTA_TABLE_MAX,
3106 .policy = nft_table_policy,
3108 [NFT_MSG_NEWCHAIN] = {
3109 .call = nf_tables_newchain,
3110 .attr_count = NFTA_CHAIN_MAX,
3111 .policy = nft_chain_policy,
3113 [NFT_MSG_GETCHAIN] = {
3114 .call = nf_tables_getchain,
3115 .attr_count = NFTA_CHAIN_MAX,
3116 .policy = nft_chain_policy,
3118 [NFT_MSG_DELCHAIN] = {
3119 .call = nf_tables_delchain,
3120 .attr_count = NFTA_CHAIN_MAX,
3121 .policy = nft_chain_policy,
3123 [NFT_MSG_NEWRULE] = {
3124 .call_batch = nf_tables_newrule,
3125 .attr_count = NFTA_RULE_MAX,
3126 .policy = nft_rule_policy,
3128 [NFT_MSG_GETRULE] = {
3129 .call = nf_tables_getrule,
3130 .attr_count = NFTA_RULE_MAX,
3131 .policy = nft_rule_policy,
3133 [NFT_MSG_DELRULE] = {
3134 .call_batch = nf_tables_delrule,
3135 .attr_count = NFTA_RULE_MAX,
3136 .policy = nft_rule_policy,
3138 [NFT_MSG_NEWSET] = {
3139 .call_batch = nf_tables_newset,
3140 .attr_count = NFTA_SET_MAX,
3141 .policy = nft_set_policy,
3143 [NFT_MSG_GETSET] = {
3144 .call = nf_tables_getset,
3145 .attr_count = NFTA_SET_MAX,
3146 .policy = nft_set_policy,
3148 [NFT_MSG_DELSET] = {
3149 .call_batch = nf_tables_delset,
3150 .attr_count = NFTA_SET_MAX,
3151 .policy = nft_set_policy,
3153 [NFT_MSG_NEWSETELEM] = {
3154 .call_batch = nf_tables_newsetelem,
3155 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3156 .policy = nft_set_elem_list_policy,
3158 [NFT_MSG_GETSETELEM] = {
3159 .call = nf_tables_getsetelem,
3160 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3161 .policy = nft_set_elem_list_policy,
3163 [NFT_MSG_DELSETELEM] = {
3164 .call_batch = nf_tables_delsetelem,
3165 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3166 .policy = nft_set_elem_list_policy,
3170 static int nf_tables_commit(struct sk_buff *skb)
3172 struct net *net = sock_net(skb->sk);
3173 struct nft_trans *trans, *next;
3175 /* Bump generation counter, invalidate any dump in progress */
3178 /* A new generation has just started */
3179 net->nft.gencursor = gencursor_next(net);
3181 /* Make sure all packets have left the previous generation before
3182 * purging old rules.
3186 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3187 switch (trans->msg_type) {
3188 case NFT_MSG_NEWRULE:
3189 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3190 nf_tables_rule_notify(trans->ctx.skb, trans->ctx.nlh,
3193 nft_trans_rule(trans),
3195 trans->ctx.afi->family);
3196 nft_trans_destroy(trans);
3198 case NFT_MSG_DELRULE:
3199 list_del_rcu(&nft_trans_rule(trans)->list);
3200 nf_tables_rule_notify(trans->ctx.skb, trans->ctx.nlh,
3203 nft_trans_rule(trans), NFT_MSG_DELRULE, 0,
3204 trans->ctx.afi->family);
3206 case NFT_MSG_NEWSET:
3207 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
3208 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3210 nft_trans_destroy(trans);
3212 case NFT_MSG_DELSET:
3213 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3219 /* Make sure we don't see any packet traversing old rules */
3222 /* Now we can safely release unused old rules */
3223 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3224 switch (trans->msg_type) {
3225 case NFT_MSG_DELRULE:
3226 nf_tables_rule_destroy(&trans->ctx,
3227 nft_trans_rule(trans));
3229 case NFT_MSG_DELSET:
3230 nft_set_destroy(nft_trans_set(trans));
3233 nft_trans_destroy(trans);
3239 static int nf_tables_abort(struct sk_buff *skb)
3241 struct net *net = sock_net(skb->sk);
3242 struct nft_trans *trans, *next;
3244 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3245 switch (trans->msg_type) {
3246 case NFT_MSG_NEWRULE:
3247 list_del_rcu(&nft_trans_rule(trans)->list);
3249 case NFT_MSG_DELRULE:
3250 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3251 nft_trans_destroy(trans);
3253 case NFT_MSG_NEWSET:
3254 list_del(&nft_trans_set(trans)->list);
3256 case NFT_MSG_DELSET:
3257 list_add_tail(&nft_trans_set(trans)->list,
3258 &trans->ctx.table->sets);
3259 nft_trans_destroy(trans);
3264 /* Make sure we don't see any packet accessing aborted rules */
3267 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3268 switch (trans->msg_type) {
3269 case NFT_MSG_NEWRULE:
3270 nf_tables_rule_destroy(&trans->ctx,
3271 nft_trans_rule(trans));
3273 case NFT_MSG_NEWSET:
3274 nft_set_destroy(nft_trans_set(trans));
3277 nft_trans_destroy(trans);
3283 static const struct nfnetlink_subsystem nf_tables_subsys = {
3284 .name = "nf_tables",
3285 .subsys_id = NFNL_SUBSYS_NFTABLES,
3286 .cb_count = NFT_MSG_MAX,
3288 .commit = nf_tables_commit,
3289 .abort = nf_tables_abort,
3293 * Loop detection - walk through the ruleset beginning at the destination chain
3294 * of a new jump until either the source chain is reached (loop) or all
3295 * reachable chains have been traversed.
3297 * The loop check is performed whenever a new jump verdict is added to an
3298 * expression or verdict map or a verdict map is bound to a new chain.
3301 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3302 const struct nft_chain *chain);
3304 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
3305 const struct nft_set *set,
3306 const struct nft_set_iter *iter,
3307 const struct nft_set_elem *elem)
3309 if (elem->flags & NFT_SET_ELEM_INTERVAL_END)
3312 switch (elem->data.verdict) {
3315 return nf_tables_check_loops(ctx, elem->data.chain);
3321 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3322 const struct nft_chain *chain)
3324 const struct nft_rule *rule;
3325 const struct nft_expr *expr, *last;
3326 const struct nft_set *set;
3327 struct nft_set_binding *binding;
3328 struct nft_set_iter iter;
3330 if (ctx->chain == chain)
3333 list_for_each_entry(rule, &chain->rules, list) {
3334 nft_rule_for_each_expr(expr, last, rule) {
3335 const struct nft_data *data = NULL;
3338 if (!expr->ops->validate)
3341 err = expr->ops->validate(ctx, expr, &data);
3348 switch (data->verdict) {
3351 err = nf_tables_check_loops(ctx, data->chain);
3360 list_for_each_entry(set, &ctx->table->sets, list) {
3361 if (!(set->flags & NFT_SET_MAP) ||
3362 set->dtype != NFT_DATA_VERDICT)
3365 list_for_each_entry(binding, &set->bindings, list) {
3366 if (binding->chain != chain)
3372 iter.fn = nf_tables_loop_check_setelem;
3374 set->ops->walk(ctx, set, &iter);
3384 * nft_validate_input_register - validate an expressions' input register
3386 * @reg: the register number
3388 * Validate that the input register is one of the general purpose
3391 int nft_validate_input_register(enum nft_registers reg)
3393 if (reg <= NFT_REG_VERDICT)
3395 if (reg > NFT_REG_MAX)
3399 EXPORT_SYMBOL_GPL(nft_validate_input_register);
3402 * nft_validate_output_register - validate an expressions' output register
3404 * @reg: the register number
3406 * Validate that the output register is one of the general purpose
3407 * registers or the verdict register.
3409 int nft_validate_output_register(enum nft_registers reg)
3411 if (reg < NFT_REG_VERDICT)
3413 if (reg > NFT_REG_MAX)
3417 EXPORT_SYMBOL_GPL(nft_validate_output_register);
3420 * nft_validate_data_load - validate an expressions' data load
3422 * @ctx: context of the expression performing the load
3423 * @reg: the destination register number
3424 * @data: the data to load
3425 * @type: the data type
3427 * Validate that a data load uses the appropriate data type for
3428 * the destination register. A value of NULL for the data means
3429 * that its runtime gathered data, which is always of type
3432 int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg,
3433 const struct nft_data *data,
3434 enum nft_data_types type)
3439 case NFT_REG_VERDICT:
3440 if (data == NULL || type != NFT_DATA_VERDICT)
3443 if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) {
3444 err = nf_tables_check_loops(ctx, data->chain);
3448 if (ctx->chain->level + 1 > data->chain->level) {
3449 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
3451 data->chain->level = ctx->chain->level + 1;
3457 if (data != NULL && type != NFT_DATA_VALUE)
3462 EXPORT_SYMBOL_GPL(nft_validate_data_load);
3464 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
3465 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
3466 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
3467 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3470 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
3471 struct nft_data_desc *desc, const struct nlattr *nla)
3473 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
3474 struct nft_chain *chain;
3477 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
3481 if (!tb[NFTA_VERDICT_CODE])
3483 data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
3485 switch (data->verdict) {
3487 switch (data->verdict & NF_VERDICT_MASK) {
3499 desc->len = sizeof(data->verdict);
3503 if (!tb[NFTA_VERDICT_CHAIN])
3505 chain = nf_tables_chain_lookup(ctx->table,
3506 tb[NFTA_VERDICT_CHAIN]);
3508 return PTR_ERR(chain);
3509 if (chain->flags & NFT_BASE_CHAIN)
3513 data->chain = chain;
3514 desc->len = sizeof(data);
3518 desc->type = NFT_DATA_VERDICT;
3522 static void nft_verdict_uninit(const struct nft_data *data)
3524 switch (data->verdict) {
3532 static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data)
3534 struct nlattr *nest;
3536 nest = nla_nest_start(skb, NFTA_DATA_VERDICT);
3538 goto nla_put_failure;
3540 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict)))
3541 goto nla_put_failure;
3543 switch (data->verdict) {
3546 if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name))
3547 goto nla_put_failure;
3549 nla_nest_end(skb, nest);
3556 static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data,
3557 struct nft_data_desc *desc, const struct nlattr *nla)
3564 if (len > sizeof(data->data))
3567 nla_memcpy(data->data, nla, sizeof(data->data));
3568 desc->type = NFT_DATA_VALUE;
3573 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
3576 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
3579 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
3580 [NFTA_DATA_VALUE] = { .type = NLA_BINARY,
3581 .len = FIELD_SIZEOF(struct nft_data, data) },
3582 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
3586 * nft_data_init - parse nf_tables data netlink attributes
3588 * @ctx: context of the expression using the data
3589 * @data: destination struct nft_data
3590 * @desc: data description
3591 * @nla: netlink attribute containing data
3593 * Parse the netlink data attributes and initialize a struct nft_data.
3594 * The type and length of data are returned in the data description.
3596 * The caller can indicate that it only wants to accept data of type
3597 * NFT_DATA_VALUE by passing NULL for the ctx argument.
3599 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
3600 struct nft_data_desc *desc, const struct nlattr *nla)
3602 struct nlattr *tb[NFTA_DATA_MAX + 1];
3605 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
3609 if (tb[NFTA_DATA_VALUE])
3610 return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
3611 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
3612 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
3615 EXPORT_SYMBOL_GPL(nft_data_init);
3618 * nft_data_uninit - release a nft_data item
3620 * @data: struct nft_data to release
3621 * @type: type of data
3623 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
3624 * all others need to be released by calling this function.
3626 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
3629 case NFT_DATA_VALUE:
3631 case NFT_DATA_VERDICT:
3632 return nft_verdict_uninit(data);
3637 EXPORT_SYMBOL_GPL(nft_data_uninit);
3639 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
3640 enum nft_data_types type, unsigned int len)
3642 struct nlattr *nest;
3645 nest = nla_nest_start(skb, attr);
3650 case NFT_DATA_VALUE:
3651 err = nft_value_dump(skb, data, len);
3653 case NFT_DATA_VERDICT:
3654 err = nft_verdict_dump(skb, data);
3661 nla_nest_end(skb, nest);
3664 EXPORT_SYMBOL_GPL(nft_data_dump);
3666 static int nf_tables_init_net(struct net *net)
3668 INIT_LIST_HEAD(&net->nft.af_info);
3669 INIT_LIST_HEAD(&net->nft.commit_list);
3673 static struct pernet_operations nf_tables_net_ops = {
3674 .init = nf_tables_init_net,
3677 static int __init nf_tables_module_init(void)
3681 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
3688 err = nf_tables_core_module_init();
3692 err = nfnetlink_subsys_register(&nf_tables_subsys);
3696 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
3697 return register_pernet_subsys(&nf_tables_net_ops);
3699 nf_tables_core_module_exit();
3706 static void __exit nf_tables_module_exit(void)
3708 unregister_pernet_subsys(&nf_tables_net_ops);
3709 nfnetlink_subsys_unregister(&nf_tables_subsys);
3710 nf_tables_core_module_exit();
3714 module_init(nf_tables_module_init);
3715 module_exit(nf_tables_module_exit);
3717 MODULE_LICENSE("GPL");
3718 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
3719 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);