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);
25 static LIST_HEAD(nf_tables_objects);
28 * nft_register_afinfo - register nf_tables address family info
30 * @afi: address family info to register
32 * Register the address family for use with nf_tables. Returns zero on
33 * success or a negative errno code otherwise.
35 int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
37 INIT_LIST_HEAD(&afi->tables);
38 nfnl_lock(NFNL_SUBSYS_NFTABLES);
39 list_add_tail_rcu(&afi->list, &net->nft.af_info);
40 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
43 EXPORT_SYMBOL_GPL(nft_register_afinfo);
45 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi);
48 * nft_unregister_afinfo - unregister nf_tables address family info
50 * @afi: address family info to unregister
52 * Unregister the address family for use with nf_tables.
54 void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi)
56 nfnl_lock(NFNL_SUBSYS_NFTABLES);
57 __nft_release_afinfo(net, afi);
58 list_del_rcu(&afi->list);
59 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
61 EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
63 static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
65 struct nft_af_info *afi;
67 list_for_each_entry(afi, &net->nft.af_info, list) {
68 if (afi->family == family)
74 static struct nft_af_info *
75 nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
77 struct nft_af_info *afi;
79 afi = nft_afinfo_lookup(net, family);
84 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
85 request_module("nft-afinfo-%u", family);
86 nfnl_lock(NFNL_SUBSYS_NFTABLES);
87 afi = nft_afinfo_lookup(net, family);
89 return ERR_PTR(-EAGAIN);
92 return ERR_PTR(-EAFNOSUPPORT);
95 static void nft_ctx_init(struct nft_ctx *ctx,
97 const struct sk_buff *skb,
98 const struct nlmsghdr *nlh,
99 struct nft_af_info *afi,
100 struct nft_table *table,
101 struct nft_chain *chain,
102 const struct nlattr * const *nla)
109 ctx->portid = NETLINK_CB(skb).portid;
110 ctx->report = nlmsg_report(nlh);
111 ctx->seq = nlh->nlmsg_seq;
114 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
115 int msg_type, u32 size, gfp_t gfp)
117 struct nft_trans *trans;
119 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
123 trans->msg_type = msg_type;
129 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
130 int msg_type, u32 size)
132 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
135 static void nft_trans_destroy(struct nft_trans *trans)
137 list_del(&trans->list);
141 static int nf_tables_register_hooks(struct net *net,
142 const struct nft_table *table,
143 struct nft_chain *chain,
144 unsigned int hook_nops)
146 if (table->flags & NFT_TABLE_F_DORMANT ||
147 !nft_is_base_chain(chain))
150 return nf_register_net_hooks(net, nft_base_chain(chain)->ops,
154 static void nf_tables_unregister_hooks(struct net *net,
155 const struct nft_table *table,
156 struct nft_chain *chain,
157 unsigned int hook_nops)
159 if (table->flags & NFT_TABLE_F_DORMANT ||
160 !nft_is_base_chain(chain))
163 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops, hook_nops);
166 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
168 struct nft_trans *trans;
170 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
174 if (msg_type == NFT_MSG_NEWTABLE)
175 nft_activate_next(ctx->net, ctx->table);
177 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
181 static int nft_deltable(struct nft_ctx *ctx)
185 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
189 nft_deactivate_next(ctx->net, ctx->table);
193 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
195 struct nft_trans *trans;
197 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
201 if (msg_type == NFT_MSG_NEWCHAIN)
202 nft_activate_next(ctx->net, ctx->chain);
204 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
208 static int nft_delchain(struct nft_ctx *ctx)
212 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
217 nft_deactivate_next(ctx->net, ctx->chain);
223 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
225 /* You cannot delete the same rule twice */
226 if (nft_is_active_next(ctx->net, rule)) {
227 nft_deactivate_next(ctx->net, rule);
234 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
235 struct nft_rule *rule)
237 struct nft_trans *trans;
239 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
243 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
244 nft_trans_rule_id(trans) =
245 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
247 nft_trans_rule(trans) = rule;
248 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
253 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
255 struct nft_trans *trans;
258 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
262 err = nf_tables_delrule_deactivate(ctx, rule);
264 nft_trans_destroy(trans);
271 static int nft_delrule_by_chain(struct nft_ctx *ctx)
273 struct nft_rule *rule;
276 list_for_each_entry(rule, &ctx->chain->rules, list) {
277 err = nft_delrule(ctx, rule);
284 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
287 struct nft_trans *trans;
289 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
293 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
294 nft_trans_set_id(trans) =
295 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
296 nft_activate_next(ctx->net, set);
298 nft_trans_set(trans) = set;
299 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
304 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
308 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
312 nft_deactivate_next(ctx->net, set);
318 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
319 struct nft_object *obj)
321 struct nft_trans *trans;
323 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
327 if (msg_type == NFT_MSG_NEWOBJ)
328 nft_activate_next(ctx->net, obj);
330 nft_trans_obj(trans) = obj;
331 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
336 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
340 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
344 nft_deactivate_next(ctx->net, obj);
354 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
355 const struct nlattr *nla,
358 struct nft_table *table;
360 list_for_each_entry(table, &afi->tables, list) {
361 if (!nla_strcmp(nla, table->name) &&
362 nft_active_genmask(table, genmask))
368 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
369 const struct nlattr *nla,
372 struct nft_table *table;
375 return ERR_PTR(-EINVAL);
377 table = nft_table_lookup(afi, nla, genmask);
381 return ERR_PTR(-ENOENT);
384 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
386 return ++table->hgenerator;
389 static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
391 static const struct nf_chain_type *
392 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
396 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
397 if (chain_type[family][i] != NULL &&
398 !nla_strcmp(nla, chain_type[family][i]->name))
399 return chain_type[family][i];
404 static const struct nf_chain_type *
405 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
406 const struct nlattr *nla,
409 const struct nf_chain_type *type;
411 type = __nf_tables_chain_type_lookup(afi->family, nla);
414 #ifdef CONFIG_MODULES
416 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
417 request_module("nft-chain-%u-%.*s", afi->family,
418 nla_len(nla), (const char *)nla_data(nla));
419 nfnl_lock(NFNL_SUBSYS_NFTABLES);
420 type = __nf_tables_chain_type_lookup(afi->family, nla);
422 return ERR_PTR(-EAGAIN);
425 return ERR_PTR(-ENOENT);
428 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
429 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
430 .len = NFT_TABLE_MAXNAMELEN - 1 },
431 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
434 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
435 u32 portid, u32 seq, int event, u32 flags,
436 int family, const struct nft_table *table)
438 struct nlmsghdr *nlh;
439 struct nfgenmsg *nfmsg;
441 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
442 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
444 goto nla_put_failure;
446 nfmsg = nlmsg_data(nlh);
447 nfmsg->nfgen_family = family;
448 nfmsg->version = NFNETLINK_V0;
449 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
451 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
452 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
453 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
454 goto nla_put_failure;
460 nlmsg_trim(skb, nlh);
464 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
470 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
473 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
477 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
478 event, 0, ctx->afi->family, ctx->table);
484 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
485 ctx->report, GFP_KERNEL);
488 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
491 static int nf_tables_dump_tables(struct sk_buff *skb,
492 struct netlink_callback *cb)
494 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
495 const struct nft_af_info *afi;
496 const struct nft_table *table;
497 unsigned int idx = 0, s_idx = cb->args[0];
498 struct net *net = sock_net(skb->sk);
499 int family = nfmsg->nfgen_family;
502 cb->seq = net->nft.base_seq;
504 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
505 if (family != NFPROTO_UNSPEC && family != afi->family)
508 list_for_each_entry_rcu(table, &afi->tables, list) {
512 memset(&cb->args[1], 0,
513 sizeof(cb->args) - sizeof(cb->args[0]));
514 if (!nft_is_active(net, table))
516 if (nf_tables_fill_table_info(skb, net,
517 NETLINK_CB(cb->skb).portid,
521 afi->family, table) < 0)
524 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
535 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
536 struct sk_buff *skb, const struct nlmsghdr *nlh,
537 const struct nlattr * const nla[])
539 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
540 u8 genmask = nft_genmask_cur(net);
541 const struct nft_af_info *afi;
542 const struct nft_table *table;
543 struct sk_buff *skb2;
544 int family = nfmsg->nfgen_family;
547 if (nlh->nlmsg_flags & NLM_F_DUMP) {
548 struct netlink_dump_control c = {
549 .dump = nf_tables_dump_tables,
551 return netlink_dump_start(nlsk, skb, nlh, &c);
554 afi = nf_tables_afinfo_lookup(net, family, false);
558 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
560 return PTR_ERR(table);
562 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
566 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
567 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
572 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
579 static void _nf_tables_table_disable(struct net *net,
580 const struct nft_af_info *afi,
581 struct nft_table *table,
584 struct nft_chain *chain;
587 list_for_each_entry(chain, &table->chains, list) {
588 if (!nft_is_active_next(net, chain))
590 if (!nft_is_base_chain(chain))
593 if (cnt && i++ == cnt)
596 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
601 static int nf_tables_table_enable(struct net *net,
602 const struct nft_af_info *afi,
603 struct nft_table *table)
605 struct nft_chain *chain;
608 list_for_each_entry(chain, &table->chains, list) {
609 if (!nft_is_active_next(net, chain))
611 if (!nft_is_base_chain(chain))
614 err = nf_register_net_hooks(net, nft_base_chain(chain)->ops,
624 _nf_tables_table_disable(net, afi, table, i);
628 static void nf_tables_table_disable(struct net *net,
629 const struct nft_af_info *afi,
630 struct nft_table *table)
632 _nf_tables_table_disable(net, afi, table, 0);
635 static int nf_tables_updtable(struct nft_ctx *ctx)
637 struct nft_trans *trans;
641 if (!ctx->nla[NFTA_TABLE_FLAGS])
644 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
645 if (flags & ~NFT_TABLE_F_DORMANT)
648 if (flags == ctx->table->flags)
651 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
652 sizeof(struct nft_trans_table));
656 if ((flags & NFT_TABLE_F_DORMANT) &&
657 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
658 nft_trans_table_enable(trans) = false;
659 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
660 ctx->table->flags & NFT_TABLE_F_DORMANT) {
661 ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table);
663 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
664 nft_trans_table_enable(trans) = true;
670 nft_trans_table_update(trans) = true;
671 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
674 nft_trans_destroy(trans);
678 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
679 struct sk_buff *skb, const struct nlmsghdr *nlh,
680 const struct nlattr * const nla[])
682 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
683 u8 genmask = nft_genmask_next(net);
684 const struct nlattr *name;
685 struct nft_af_info *afi;
686 struct nft_table *table;
687 int family = nfmsg->nfgen_family;
692 afi = nf_tables_afinfo_lookup(net, family, true);
696 name = nla[NFTA_TABLE_NAME];
697 table = nf_tables_table_lookup(afi, name, genmask);
699 if (PTR_ERR(table) != -ENOENT)
700 return PTR_ERR(table);
702 if (nlh->nlmsg_flags & NLM_F_EXCL)
704 if (nlh->nlmsg_flags & NLM_F_REPLACE)
707 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
708 return nf_tables_updtable(&ctx);
711 if (nla[NFTA_TABLE_FLAGS]) {
712 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
713 if (flags & ~NFT_TABLE_F_DORMANT)
718 if (!try_module_get(afi->owner))
722 table = kzalloc(sizeof(*table), GFP_KERNEL);
726 nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
727 INIT_LIST_HEAD(&table->chains);
728 INIT_LIST_HEAD(&table->sets);
729 INIT_LIST_HEAD(&table->objects);
730 table->flags = flags;
732 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
733 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
737 list_add_tail_rcu(&table->list, &afi->tables);
742 module_put(afi->owner);
747 static int nft_flush_table(struct nft_ctx *ctx)
750 struct nft_chain *chain, *nc;
751 struct nft_object *obj, *ne;
752 struct nft_set *set, *ns;
754 list_for_each_entry(chain, &ctx->table->chains, list) {
755 if (!nft_is_active_next(ctx->net, chain))
760 err = nft_delrule_by_chain(ctx);
765 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
766 if (!nft_is_active_next(ctx->net, set))
769 if (set->flags & NFT_SET_ANONYMOUS &&
770 !list_empty(&set->bindings))
773 err = nft_delset(ctx, set);
778 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
779 err = nft_delobj(ctx, obj);
784 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
785 if (!nft_is_active_next(ctx->net, chain))
790 err = nft_delchain(ctx);
795 err = nft_deltable(ctx);
800 static int nft_flush(struct nft_ctx *ctx, int family)
802 struct nft_af_info *afi;
803 struct nft_table *table, *nt;
804 const struct nlattr * const *nla = ctx->nla;
807 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
808 if (family != AF_UNSPEC && afi->family != family)
812 list_for_each_entry_safe(table, nt, &afi->tables, list) {
813 if (!nft_is_active_next(ctx->net, table))
816 if (nla[NFTA_TABLE_NAME] &&
817 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
822 err = nft_flush_table(ctx);
831 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
832 struct sk_buff *skb, const struct nlmsghdr *nlh,
833 const struct nlattr * const nla[])
835 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
836 u8 genmask = nft_genmask_next(net);
837 struct nft_af_info *afi;
838 struct nft_table *table;
839 int family = nfmsg->nfgen_family;
842 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
843 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
844 return nft_flush(&ctx, family);
846 afi = nf_tables_afinfo_lookup(net, family, false);
850 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
852 return PTR_ERR(table);
857 return nft_flush_table(&ctx);
860 static void nf_tables_table_destroy(struct nft_ctx *ctx)
862 BUG_ON(ctx->table->use > 0);
865 module_put(ctx->afi->owner);
868 int nft_register_chain_type(const struct nf_chain_type *ctype)
872 nfnl_lock(NFNL_SUBSYS_NFTABLES);
873 if (chain_type[ctype->family][ctype->type] != NULL) {
877 chain_type[ctype->family][ctype->type] = ctype;
879 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
882 EXPORT_SYMBOL_GPL(nft_register_chain_type);
884 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
886 nfnl_lock(NFNL_SUBSYS_NFTABLES);
887 chain_type[ctype->family][ctype->type] = NULL;
888 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
890 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
896 static struct nft_chain *
897 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle,
900 struct nft_chain *chain;
902 list_for_each_entry(chain, &table->chains, list) {
903 if (chain->handle == handle &&
904 nft_active_genmask(chain, genmask))
908 return ERR_PTR(-ENOENT);
911 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
912 const struct nlattr *nla,
915 struct nft_chain *chain;
918 return ERR_PTR(-EINVAL);
920 list_for_each_entry(chain, &table->chains, list) {
921 if (!nla_strcmp(nla, chain->name) &&
922 nft_active_genmask(chain, genmask))
926 return ERR_PTR(-ENOENT);
929 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
930 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
931 .len = NFT_TABLE_MAXNAMELEN - 1 },
932 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
933 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
934 .len = NFT_CHAIN_MAXNAMELEN - 1 },
935 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
936 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
937 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
938 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
941 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
942 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
943 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
944 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
945 .len = IFNAMSIZ - 1 },
948 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
950 struct nft_stats *cpu_stats, total;
956 memset(&total, 0, sizeof(total));
957 for_each_possible_cpu(cpu) {
958 cpu_stats = per_cpu_ptr(stats, cpu);
960 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
961 pkts = cpu_stats->pkts;
962 bytes = cpu_stats->bytes;
963 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
965 total.bytes += bytes;
967 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
969 goto nla_put_failure;
971 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
973 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
975 goto nla_put_failure;
977 nla_nest_end(skb, nest);
984 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
985 u32 portid, u32 seq, int event, u32 flags,
986 int family, const struct nft_table *table,
987 const struct nft_chain *chain)
989 struct nlmsghdr *nlh;
990 struct nfgenmsg *nfmsg;
992 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
993 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
995 goto nla_put_failure;
997 nfmsg = nlmsg_data(nlh);
998 nfmsg->nfgen_family = family;
999 nfmsg->version = NFNETLINK_V0;
1000 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1002 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1003 goto nla_put_failure;
1004 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1006 goto nla_put_failure;
1007 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1008 goto nla_put_failure;
1010 if (nft_is_base_chain(chain)) {
1011 const struct nft_base_chain *basechain = nft_base_chain(chain);
1012 const struct nf_hook_ops *ops = &basechain->ops[0];
1013 struct nlattr *nest;
1015 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
1017 goto nla_put_failure;
1018 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1019 goto nla_put_failure;
1020 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1021 goto nla_put_failure;
1022 if (basechain->dev_name[0] &&
1023 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1024 goto nla_put_failure;
1025 nla_nest_end(skb, nest);
1027 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1028 htonl(basechain->policy)))
1029 goto nla_put_failure;
1031 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1032 goto nla_put_failure;
1034 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
1035 goto nla_put_failure;
1038 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1039 goto nla_put_failure;
1041 nlmsg_end(skb, nlh);
1045 nlmsg_trim(skb, nlh);
1049 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1051 struct sk_buff *skb;
1055 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1058 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1062 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1063 event, 0, ctx->afi->family, ctx->table,
1070 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1071 ctx->report, GFP_KERNEL);
1074 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1077 static int nf_tables_dump_chains(struct sk_buff *skb,
1078 struct netlink_callback *cb)
1080 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1081 const struct nft_af_info *afi;
1082 const struct nft_table *table;
1083 const struct nft_chain *chain;
1084 unsigned int idx = 0, s_idx = cb->args[0];
1085 struct net *net = sock_net(skb->sk);
1086 int family = nfmsg->nfgen_family;
1089 cb->seq = net->nft.base_seq;
1091 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1092 if (family != NFPROTO_UNSPEC && family != afi->family)
1095 list_for_each_entry_rcu(table, &afi->tables, list) {
1096 list_for_each_entry_rcu(chain, &table->chains, list) {
1100 memset(&cb->args[1], 0,
1101 sizeof(cb->args) - sizeof(cb->args[0]));
1102 if (!nft_is_active(net, chain))
1104 if (nf_tables_fill_chain_info(skb, net,
1105 NETLINK_CB(cb->skb).portid,
1109 afi->family, table, chain) < 0)
1112 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1124 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1125 struct sk_buff *skb, const struct nlmsghdr *nlh,
1126 const struct nlattr * const nla[])
1128 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1129 u8 genmask = nft_genmask_cur(net);
1130 const struct nft_af_info *afi;
1131 const struct nft_table *table;
1132 const struct nft_chain *chain;
1133 struct sk_buff *skb2;
1134 int family = nfmsg->nfgen_family;
1137 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1138 struct netlink_dump_control c = {
1139 .dump = nf_tables_dump_chains,
1141 return netlink_dump_start(nlsk, skb, nlh, &c);
1144 afi = nf_tables_afinfo_lookup(net, family, false);
1146 return PTR_ERR(afi);
1148 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1150 return PTR_ERR(table);
1152 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1154 return PTR_ERR(chain);
1156 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1160 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1161 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1162 family, table, chain);
1166 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1173 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1174 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1175 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1178 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1180 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1181 struct nft_stats __percpu *newstats;
1182 struct nft_stats *stats;
1185 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy,
1188 return ERR_PTR(err);
1190 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1191 return ERR_PTR(-EINVAL);
1193 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1194 if (newstats == NULL)
1195 return ERR_PTR(-ENOMEM);
1197 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1198 * are not exposed to userspace.
1201 stats = this_cpu_ptr(newstats);
1202 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1203 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1209 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1210 struct nft_stats __percpu *newstats)
1212 if (newstats == NULL)
1216 struct nft_stats __percpu *oldstats =
1217 nft_dereference(chain->stats);
1219 rcu_assign_pointer(chain->stats, newstats);
1221 free_percpu(oldstats);
1223 rcu_assign_pointer(chain->stats, newstats);
1226 static void nf_tables_chain_destroy(struct nft_chain *chain)
1228 BUG_ON(chain->use > 0);
1230 if (nft_is_base_chain(chain)) {
1231 struct nft_base_chain *basechain = nft_base_chain(chain);
1233 module_put(basechain->type->owner);
1234 free_percpu(basechain->stats);
1235 if (basechain->ops[0].dev != NULL)
1236 dev_put(basechain->ops[0].dev);
1243 struct nft_chain_hook {
1246 const struct nf_chain_type *type;
1247 struct net_device *dev;
1250 static int nft_chain_parse_hook(struct net *net,
1251 const struct nlattr * const nla[],
1252 struct nft_af_info *afi,
1253 struct nft_chain_hook *hook, bool create)
1255 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1256 const struct nf_chain_type *type;
1257 struct net_device *dev;
1260 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1261 nft_hook_policy, NULL);
1265 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1266 ha[NFTA_HOOK_PRIORITY] == NULL)
1269 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1270 if (hook->num >= afi->nhooks)
1273 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1275 type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT];
1276 if (nla[NFTA_CHAIN_TYPE]) {
1277 type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE],
1280 return PTR_ERR(type);
1282 if (!(type->hook_mask & (1 << hook->num)))
1284 if (!try_module_get(type->owner))
1290 if (afi->flags & NFT_AF_NEEDS_DEV) {
1291 char ifname[IFNAMSIZ];
1293 if (!ha[NFTA_HOOK_DEV]) {
1294 module_put(type->owner);
1298 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1299 dev = dev_get_by_name(net, ifname);
1301 module_put(type->owner);
1305 } else if (ha[NFTA_HOOK_DEV]) {
1306 module_put(type->owner);
1313 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1315 module_put(hook->type->owner);
1316 if (hook->dev != NULL)
1320 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1321 struct sk_buff *skb, const struct nlmsghdr *nlh,
1322 const struct nlattr * const nla[])
1324 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1325 const struct nlattr * uninitialized_var(name);
1326 struct nft_af_info *afi;
1327 struct nft_table *table;
1328 struct nft_chain *chain;
1329 struct nft_base_chain *basechain = NULL;
1330 u8 genmask = nft_genmask_next(net);
1331 int family = nfmsg->nfgen_family;
1332 u8 policy = NF_ACCEPT;
1335 struct nft_stats __percpu *stats;
1340 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1342 afi = nf_tables_afinfo_lookup(net, family, true);
1344 return PTR_ERR(afi);
1346 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1348 return PTR_ERR(table);
1351 name = nla[NFTA_CHAIN_NAME];
1353 if (nla[NFTA_CHAIN_HANDLE]) {
1354 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1355 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
1357 return PTR_ERR(chain);
1359 chain = nf_tables_chain_lookup(table, name, genmask);
1360 if (IS_ERR(chain)) {
1361 if (PTR_ERR(chain) != -ENOENT)
1362 return PTR_ERR(chain);
1367 if (nla[NFTA_CHAIN_POLICY]) {
1368 if (chain != NULL &&
1369 !nft_is_base_chain(chain))
1372 if (chain == NULL &&
1373 nla[NFTA_CHAIN_HOOK] == NULL)
1376 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1386 if (chain != NULL) {
1387 struct nft_stats *stats = NULL;
1388 struct nft_trans *trans;
1390 if (nlh->nlmsg_flags & NLM_F_EXCL)
1392 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1395 if (nla[NFTA_CHAIN_HOOK]) {
1396 struct nft_base_chain *basechain;
1397 struct nft_chain_hook hook;
1398 struct nf_hook_ops *ops;
1400 if (!nft_is_base_chain(chain))
1403 err = nft_chain_parse_hook(net, nla, afi, &hook,
1408 basechain = nft_base_chain(chain);
1409 if (basechain->type != hook.type) {
1410 nft_chain_release_hook(&hook);
1414 for (i = 0; i < afi->nops; i++) {
1415 ops = &basechain->ops[i];
1416 if (ops->hooknum != hook.num ||
1417 ops->priority != hook.priority ||
1418 ops->dev != hook.dev) {
1419 nft_chain_release_hook(&hook);
1423 nft_chain_release_hook(&hook);
1426 if (nla[NFTA_CHAIN_HANDLE] && name) {
1427 struct nft_chain *chain2;
1429 chain2 = nf_tables_chain_lookup(table,
1430 nla[NFTA_CHAIN_NAME],
1433 return PTR_ERR(chain2);
1436 if (nla[NFTA_CHAIN_COUNTERS]) {
1437 if (!nft_is_base_chain(chain))
1440 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1442 return PTR_ERR(stats);
1445 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1446 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1447 sizeof(struct nft_trans_chain));
1448 if (trans == NULL) {
1453 nft_trans_chain_stats(trans) = stats;
1454 nft_trans_chain_update(trans) = true;
1456 if (nla[NFTA_CHAIN_POLICY])
1457 nft_trans_chain_policy(trans) = policy;
1459 nft_trans_chain_policy(trans) = -1;
1461 if (nla[NFTA_CHAIN_HANDLE] && name) {
1462 nla_strlcpy(nft_trans_chain_name(trans), name,
1463 NFT_CHAIN_MAXNAMELEN);
1465 list_add_tail(&trans->list, &net->nft.commit_list);
1469 if (table->use == UINT_MAX)
1472 if (nla[NFTA_CHAIN_HOOK]) {
1473 struct nft_chain_hook hook;
1474 struct nf_hook_ops *ops;
1477 err = nft_chain_parse_hook(net, nla, afi, &hook, create);
1481 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1482 if (basechain == NULL) {
1483 nft_chain_release_hook(&hook);
1487 if (hook.dev != NULL)
1488 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1490 if (nla[NFTA_CHAIN_COUNTERS]) {
1491 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1492 if (IS_ERR(stats)) {
1493 nft_chain_release_hook(&hook);
1495 return PTR_ERR(stats);
1497 basechain->stats = stats;
1499 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1500 if (stats == NULL) {
1501 nft_chain_release_hook(&hook);
1505 rcu_assign_pointer(basechain->stats, stats);
1508 hookfn = hook.type->hooks[hook.num];
1509 basechain->type = hook.type;
1510 chain = &basechain->chain;
1512 for (i = 0; i < afi->nops; i++) {
1513 ops = &basechain->ops[i];
1515 ops->hooknum = hook.num;
1516 ops->priority = hook.priority;
1518 ops->hook = afi->hooks[ops->hooknum];
1519 ops->dev = hook.dev;
1522 if (afi->hook_ops_init)
1523 afi->hook_ops_init(ops, i);
1526 chain->flags |= NFT_BASE_CHAIN;
1527 basechain->policy = policy;
1529 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1534 INIT_LIST_HEAD(&chain->rules);
1535 chain->handle = nf_tables_alloc_handle(table);
1536 chain->table = table;
1537 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1539 err = nf_tables_register_hooks(net, table, chain, afi->nops);
1543 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1544 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1549 list_add_tail_rcu(&chain->list, &table->chains);
1552 nf_tables_unregister_hooks(net, table, chain, afi->nops);
1554 nf_tables_chain_destroy(chain);
1558 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1559 struct sk_buff *skb, const struct nlmsghdr *nlh,
1560 const struct nlattr * const nla[])
1562 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1563 u8 genmask = nft_genmask_next(net);
1564 struct nft_af_info *afi;
1565 struct nft_table *table;
1566 struct nft_chain *chain;
1567 int family = nfmsg->nfgen_family;
1570 afi = nf_tables_afinfo_lookup(net, family, false);
1572 return PTR_ERR(afi);
1574 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1576 return PTR_ERR(table);
1578 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1580 return PTR_ERR(chain);
1584 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1586 return nft_delchain(&ctx);
1594 * nft_register_expr - register nf_tables expr type
1597 * Registers the expr type for use with nf_tables. Returns zero on
1598 * success or a negative errno code otherwise.
1600 int nft_register_expr(struct nft_expr_type *type)
1602 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1603 if (type->family == NFPROTO_UNSPEC)
1604 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1606 list_add_rcu(&type->list, &nf_tables_expressions);
1607 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1610 EXPORT_SYMBOL_GPL(nft_register_expr);
1613 * nft_unregister_expr - unregister nf_tables expr type
1616 * Unregisters the expr typefor use with nf_tables.
1618 void nft_unregister_expr(struct nft_expr_type *type)
1620 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1621 list_del_rcu(&type->list);
1622 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1624 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1626 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1629 const struct nft_expr_type *type;
1631 list_for_each_entry(type, &nf_tables_expressions, list) {
1632 if (!nla_strcmp(nla, type->name) &&
1633 (!type->family || type->family == family))
1639 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1642 const struct nft_expr_type *type;
1645 return ERR_PTR(-EINVAL);
1647 type = __nft_expr_type_get(family, nla);
1648 if (type != NULL && try_module_get(type->owner))
1651 #ifdef CONFIG_MODULES
1653 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1654 request_module("nft-expr-%u-%.*s", family,
1655 nla_len(nla), (char *)nla_data(nla));
1656 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1657 if (__nft_expr_type_get(family, nla))
1658 return ERR_PTR(-EAGAIN);
1660 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1661 request_module("nft-expr-%.*s",
1662 nla_len(nla), (char *)nla_data(nla));
1663 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1664 if (__nft_expr_type_get(family, nla))
1665 return ERR_PTR(-EAGAIN);
1668 return ERR_PTR(-ENOENT);
1671 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1672 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1673 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1676 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1677 const struct nft_expr *expr)
1679 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1680 goto nla_put_failure;
1682 if (expr->ops->dump) {
1683 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1685 goto nla_put_failure;
1686 if (expr->ops->dump(skb, expr) < 0)
1687 goto nla_put_failure;
1688 nla_nest_end(skb, data);
1697 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1698 const struct nft_expr *expr)
1700 struct nlattr *nest;
1702 nest = nla_nest_start(skb, attr);
1704 goto nla_put_failure;
1705 if (nf_tables_fill_expr_info(skb, expr) < 0)
1706 goto nla_put_failure;
1707 nla_nest_end(skb, nest);
1714 struct nft_expr_info {
1715 const struct nft_expr_ops *ops;
1716 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1719 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1720 const struct nlattr *nla,
1721 struct nft_expr_info *info)
1723 const struct nft_expr_type *type;
1724 const struct nft_expr_ops *ops;
1725 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1728 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL);
1732 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1734 return PTR_ERR(type);
1736 if (tb[NFTA_EXPR_DATA]) {
1737 err = nla_parse_nested(info->tb, type->maxattr,
1738 tb[NFTA_EXPR_DATA], type->policy, NULL);
1742 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1744 if (type->select_ops != NULL) {
1745 ops = type->select_ops(ctx,
1746 (const struct nlattr * const *)info->tb);
1758 module_put(type->owner);
1762 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1763 const struct nft_expr_info *info,
1764 struct nft_expr *expr)
1766 const struct nft_expr_ops *ops = info->ops;
1771 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1776 if (ops->validate) {
1777 const struct nft_data *data = NULL;
1779 err = ops->validate(ctx, expr, &data);
1788 ops->destroy(ctx, expr);
1794 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1795 struct nft_expr *expr)
1797 if (expr->ops->destroy)
1798 expr->ops->destroy(ctx, expr);
1799 module_put(expr->ops->type->owner);
1802 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1803 const struct nlattr *nla)
1805 struct nft_expr_info info;
1806 struct nft_expr *expr;
1809 err = nf_tables_expr_parse(ctx, nla, &info);
1814 expr = kzalloc(info.ops->size, GFP_KERNEL);
1818 err = nf_tables_newexpr(ctx, &info, expr);
1826 module_put(info.ops->type->owner);
1828 return ERR_PTR(err);
1831 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1833 nf_tables_expr_destroy(ctx, expr);
1841 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1844 struct nft_rule *rule;
1846 // FIXME: this sucks
1847 list_for_each_entry(rule, &chain->rules, list) {
1848 if (handle == rule->handle)
1852 return ERR_PTR(-ENOENT);
1855 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1856 const struct nlattr *nla)
1859 return ERR_PTR(-EINVAL);
1861 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1864 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1865 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
1866 .len = NFT_TABLE_MAXNAMELEN - 1 },
1867 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1868 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1869 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1870 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1871 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1872 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1873 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1874 .len = NFT_USERDATA_MAXLEN },
1877 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1878 u32 portid, u32 seq, int event,
1879 u32 flags, int family,
1880 const struct nft_table *table,
1881 const struct nft_chain *chain,
1882 const struct nft_rule *rule)
1884 struct nlmsghdr *nlh;
1885 struct nfgenmsg *nfmsg;
1886 const struct nft_expr *expr, *next;
1887 struct nlattr *list;
1888 const struct nft_rule *prule;
1889 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1891 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
1893 goto nla_put_failure;
1895 nfmsg = nlmsg_data(nlh);
1896 nfmsg->nfgen_family = family;
1897 nfmsg->version = NFNETLINK_V0;
1898 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1900 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1901 goto nla_put_failure;
1902 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1903 goto nla_put_failure;
1904 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1906 goto nla_put_failure;
1908 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1909 prule = list_prev_entry(rule, list);
1910 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1911 cpu_to_be64(prule->handle),
1913 goto nla_put_failure;
1916 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1918 goto nla_put_failure;
1919 nft_rule_for_each_expr(expr, next, rule) {
1920 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
1921 goto nla_put_failure;
1923 nla_nest_end(skb, list);
1926 struct nft_userdata *udata = nft_userdata(rule);
1927 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1929 goto nla_put_failure;
1932 nlmsg_end(skb, nlh);
1936 nlmsg_trim(skb, nlh);
1940 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
1941 const struct nft_rule *rule, int event)
1943 struct sk_buff *skb;
1947 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1950 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1954 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1955 event, 0, ctx->afi->family, ctx->table,
1962 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1963 ctx->report, GFP_KERNEL);
1966 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1969 struct nft_rule_dump_ctx {
1970 char table[NFT_TABLE_MAXNAMELEN];
1971 char chain[NFT_CHAIN_MAXNAMELEN];
1974 static int nf_tables_dump_rules(struct sk_buff *skb,
1975 struct netlink_callback *cb)
1977 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1978 const struct nft_rule_dump_ctx *ctx = cb->data;
1979 const struct nft_af_info *afi;
1980 const struct nft_table *table;
1981 const struct nft_chain *chain;
1982 const struct nft_rule *rule;
1983 unsigned int idx = 0, s_idx = cb->args[0];
1984 struct net *net = sock_net(skb->sk);
1985 int family = nfmsg->nfgen_family;
1988 cb->seq = net->nft.base_seq;
1990 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1991 if (family != NFPROTO_UNSPEC && family != afi->family)
1994 list_for_each_entry_rcu(table, &afi->tables, list) {
1995 if (ctx && ctx->table[0] &&
1996 strcmp(ctx->table, table->name) != 0)
1999 list_for_each_entry_rcu(chain, &table->chains, list) {
2000 if (ctx && ctx->chain[0] &&
2001 strcmp(ctx->chain, chain->name) != 0)
2004 list_for_each_entry_rcu(rule, &chain->rules, list) {
2005 if (!nft_is_active(net, rule))
2010 memset(&cb->args[1], 0,
2011 sizeof(cb->args) - sizeof(cb->args[0]));
2012 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2015 NLM_F_MULTI | NLM_F_APPEND,
2016 afi->family, table, chain, rule) < 0)
2019 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2033 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2039 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2040 struct sk_buff *skb, const struct nlmsghdr *nlh,
2041 const struct nlattr * const nla[])
2043 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2044 u8 genmask = nft_genmask_cur(net);
2045 const struct nft_af_info *afi;
2046 const struct nft_table *table;
2047 const struct nft_chain *chain;
2048 const struct nft_rule *rule;
2049 struct sk_buff *skb2;
2050 int family = nfmsg->nfgen_family;
2053 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2054 struct netlink_dump_control c = {
2055 .dump = nf_tables_dump_rules,
2056 .done = nf_tables_dump_rules_done,
2059 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2060 struct nft_rule_dump_ctx *ctx;
2062 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
2066 if (nla[NFTA_RULE_TABLE])
2067 nla_strlcpy(ctx->table, nla[NFTA_RULE_TABLE],
2068 sizeof(ctx->table));
2069 if (nla[NFTA_RULE_CHAIN])
2070 nla_strlcpy(ctx->chain, nla[NFTA_RULE_CHAIN],
2071 sizeof(ctx->chain));
2075 return netlink_dump_start(nlsk, skb, nlh, &c);
2078 afi = nf_tables_afinfo_lookup(net, family, false);
2080 return PTR_ERR(afi);
2082 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2084 return PTR_ERR(table);
2086 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2088 return PTR_ERR(chain);
2090 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2092 return PTR_ERR(rule);
2094 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2098 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2099 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2100 family, table, chain, rule);
2104 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2111 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2112 struct nft_rule *rule)
2114 struct nft_expr *expr;
2117 * Careful: some expressions might not be initialized in case this
2118 * is called on error from nf_tables_newrule().
2120 expr = nft_expr_first(rule);
2121 while (expr != nft_expr_last(rule) && expr->ops) {
2122 nf_tables_expr_destroy(ctx, expr);
2123 expr = nft_expr_next(expr);
2128 #define NFT_RULE_MAXEXPRS 128
2130 static struct nft_expr_info *info;
2132 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2133 struct sk_buff *skb, const struct nlmsghdr *nlh,
2134 const struct nlattr * const nla[])
2136 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2137 u8 genmask = nft_genmask_next(net);
2138 struct nft_af_info *afi;
2139 struct nft_table *table;
2140 struct nft_chain *chain;
2141 struct nft_rule *rule, *old_rule = NULL;
2142 struct nft_userdata *udata;
2143 struct nft_trans *trans = NULL;
2144 struct nft_expr *expr;
2147 unsigned int size, i, n, ulen = 0, usize = 0;
2150 u64 handle, pos_handle;
2152 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2154 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2156 return PTR_ERR(afi);
2158 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2160 return PTR_ERR(table);
2162 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2164 return PTR_ERR(chain);
2166 if (nla[NFTA_RULE_HANDLE]) {
2167 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2168 rule = __nf_tables_rule_lookup(chain, handle);
2170 return PTR_ERR(rule);
2172 if (nlh->nlmsg_flags & NLM_F_EXCL)
2174 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2179 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2181 handle = nf_tables_alloc_handle(table);
2183 if (chain->use == UINT_MAX)
2187 if (nla[NFTA_RULE_POSITION]) {
2188 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2191 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2192 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2193 if (IS_ERR(old_rule))
2194 return PTR_ERR(old_rule);
2197 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2201 if (nla[NFTA_RULE_EXPRESSIONS]) {
2202 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2204 if (nla_type(tmp) != NFTA_LIST_ELEM)
2206 if (n == NFT_RULE_MAXEXPRS)
2208 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2211 size += info[n].ops->size;
2215 /* Check for overflow of dlen field */
2217 if (size >= 1 << 12)
2220 if (nla[NFTA_RULE_USERDATA]) {
2221 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2223 usize = sizeof(struct nft_userdata) + ulen;
2227 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2231 nft_activate_next(net, rule);
2233 rule->handle = handle;
2235 rule->udata = ulen ? 1 : 0;
2238 udata = nft_userdata(rule);
2239 udata->len = ulen - 1;
2240 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2243 expr = nft_expr_first(rule);
2244 for (i = 0; i < n; i++) {
2245 err = nf_tables_newexpr(&ctx, &info[i], expr);
2249 expr = nft_expr_next(expr);
2252 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2253 if (nft_is_active_next(net, old_rule)) {
2254 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2256 if (trans == NULL) {
2260 nft_deactivate_next(net, old_rule);
2262 list_add_tail_rcu(&rule->list, &old_rule->list);
2267 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2269 list_add_rcu(&rule->list, &old_rule->list);
2271 list_add_tail_rcu(&rule->list, &chain->rules);
2274 list_add_tail_rcu(&rule->list, &old_rule->list);
2276 list_add_rcu(&rule->list, &chain->rules);
2279 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2287 list_del_rcu(&rule->list);
2289 nf_tables_rule_destroy(&ctx, rule);
2291 for (i = 0; i < n; i++) {
2292 if (info[i].ops != NULL)
2293 module_put(info[i].ops->type->owner);
2298 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2299 const struct nlattr *nla)
2301 u32 id = ntohl(nla_get_be32(nla));
2302 struct nft_trans *trans;
2304 list_for_each_entry(trans, &net->nft.commit_list, list) {
2305 struct nft_rule *rule = nft_trans_rule(trans);
2307 if (trans->msg_type == NFT_MSG_NEWRULE &&
2308 id == nft_trans_rule_id(trans))
2311 return ERR_PTR(-ENOENT);
2314 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2315 struct sk_buff *skb, const struct nlmsghdr *nlh,
2316 const struct nlattr * const nla[])
2318 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2319 u8 genmask = nft_genmask_next(net);
2320 struct nft_af_info *afi;
2321 struct nft_table *table;
2322 struct nft_chain *chain = NULL;
2323 struct nft_rule *rule;
2324 int family = nfmsg->nfgen_family, err = 0;
2327 afi = nf_tables_afinfo_lookup(net, family, false);
2329 return PTR_ERR(afi);
2331 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2333 return PTR_ERR(table);
2335 if (nla[NFTA_RULE_CHAIN]) {
2336 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2339 return PTR_ERR(chain);
2342 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2345 if (nla[NFTA_RULE_HANDLE]) {
2346 rule = nf_tables_rule_lookup(chain,
2347 nla[NFTA_RULE_HANDLE]);
2349 return PTR_ERR(rule);
2351 err = nft_delrule(&ctx, rule);
2352 } else if (nla[NFTA_RULE_ID]) {
2353 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2355 return PTR_ERR(rule);
2357 err = nft_delrule(&ctx, rule);
2359 err = nft_delrule_by_chain(&ctx);
2362 list_for_each_entry(chain, &table->chains, list) {
2363 if (!nft_is_active_next(net, chain))
2367 err = nft_delrule_by_chain(&ctx);
2380 static LIST_HEAD(nf_tables_set_ops);
2382 int nft_register_set(struct nft_set_ops *ops)
2384 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2385 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2386 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2389 EXPORT_SYMBOL_GPL(nft_register_set);
2391 void nft_unregister_set(struct nft_set_ops *ops)
2393 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2394 list_del_rcu(&ops->list);
2395 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2397 EXPORT_SYMBOL_GPL(nft_unregister_set);
2400 * Select a set implementation based on the data characteristics and the
2401 * given policy. The total memory use might not be known if no size is
2402 * given, in that case the amount of memory per element is used.
2404 static const struct nft_set_ops *
2405 nft_select_set_ops(const struct nlattr * const nla[],
2406 const struct nft_set_desc *desc,
2407 enum nft_set_policies policy)
2409 const struct nft_set_ops *ops, *bops;
2410 struct nft_set_estimate est, best;
2413 #ifdef CONFIG_MODULES
2414 if (list_empty(&nf_tables_set_ops)) {
2415 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2416 request_module("nft-set");
2417 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2418 if (!list_empty(&nf_tables_set_ops))
2419 return ERR_PTR(-EAGAIN);
2423 if (nla[NFTA_SET_FLAGS] != NULL) {
2424 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2425 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT |
2434 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2435 if ((ops->features & features) != features)
2437 if (!ops->estimate(desc, features, &est))
2441 case NFT_SET_POL_PERFORMANCE:
2442 if (est.lookup < best.lookup)
2444 if (est.lookup == best.lookup) {
2446 if (est.space < best.space)
2448 } else if (est.size < best.size) {
2453 case NFT_SET_POL_MEMORY:
2455 if (est.space < best.space)
2457 if (est.space == best.space &&
2458 est.lookup < best.lookup)
2460 } else if (est.size < best.size) {
2468 if (!try_module_get(ops->owner))
2471 module_put(bops->owner);
2480 return ERR_PTR(-EOPNOTSUPP);
2483 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2484 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2485 .len = NFT_TABLE_MAXNAMELEN - 1 },
2486 [NFTA_SET_NAME] = { .type = NLA_STRING,
2487 .len = NFT_SET_MAXNAMELEN - 1 },
2488 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2489 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2490 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2491 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2492 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2493 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2494 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2495 [NFTA_SET_ID] = { .type = NLA_U32 },
2496 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2497 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2498 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2499 .len = NFT_USERDATA_MAXLEN },
2500 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
2503 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2504 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2507 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2508 const struct sk_buff *skb,
2509 const struct nlmsghdr *nlh,
2510 const struct nlattr * const nla[],
2513 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2514 struct nft_af_info *afi = NULL;
2515 struct nft_table *table = NULL;
2517 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2518 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2520 return PTR_ERR(afi);
2523 if (nla[NFTA_SET_TABLE] != NULL) {
2525 return -EAFNOSUPPORT;
2527 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2530 return PTR_ERR(table);
2533 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
2537 static struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2538 const struct nlattr *nla, u8 genmask)
2540 struct nft_set *set;
2543 return ERR_PTR(-EINVAL);
2545 list_for_each_entry(set, &table->sets, list) {
2546 if (!nla_strcmp(nla, set->name) &&
2547 nft_active_genmask(set, genmask))
2550 return ERR_PTR(-ENOENT);
2553 static struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2554 const struct nlattr *nla,
2557 struct nft_trans *trans;
2558 u32 id = ntohl(nla_get_be32(nla));
2560 list_for_each_entry(trans, &net->nft.commit_list, list) {
2561 struct nft_set *set = nft_trans_set(trans);
2563 if (trans->msg_type == NFT_MSG_NEWSET &&
2564 id == nft_trans_set_id(trans) &&
2565 nft_active_genmask(set, genmask))
2568 return ERR_PTR(-ENOENT);
2571 struct nft_set *nft_set_lookup(const struct net *net,
2572 const struct nft_table *table,
2573 const struct nlattr *nla_set_name,
2574 const struct nlattr *nla_set_id,
2577 struct nft_set *set;
2579 set = nf_tables_set_lookup(table, nla_set_name, genmask);
2584 set = nf_tables_set_lookup_byid(net, nla_set_id, genmask);
2588 EXPORT_SYMBOL_GPL(nft_set_lookup);
2590 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2593 const struct nft_set *i;
2595 unsigned long *inuse;
2596 unsigned int n = 0, min = 0;
2598 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
2600 if (p[1] != 'd' || strchr(p + 2, '%'))
2603 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2607 list_for_each_entry(i, &ctx->table->sets, list) {
2610 if (!nft_is_active_next(ctx->net, set))
2612 if (!sscanf(i->name, name, &tmp))
2614 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2617 set_bit(tmp - min, inuse);
2620 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2621 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2622 min += BITS_PER_BYTE * PAGE_SIZE;
2623 memset(inuse, 0, PAGE_SIZE);
2626 free_page((unsigned long)inuse);
2629 snprintf(set->name, sizeof(set->name), name, min + n);
2630 list_for_each_entry(i, &ctx->table->sets, list) {
2631 if (!nft_is_active_next(ctx->net, i))
2633 if (!strcmp(set->name, i->name))
2639 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2640 const struct nft_set *set, u16 event, u16 flags)
2642 struct nfgenmsg *nfmsg;
2643 struct nlmsghdr *nlh;
2644 struct nlattr *desc;
2645 u32 portid = ctx->portid;
2648 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2649 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2652 goto nla_put_failure;
2654 nfmsg = nlmsg_data(nlh);
2655 nfmsg->nfgen_family = ctx->afi->family;
2656 nfmsg->version = NFNETLINK_V0;
2657 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2659 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2660 goto nla_put_failure;
2661 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2662 goto nla_put_failure;
2663 if (set->flags != 0)
2664 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2665 goto nla_put_failure;
2667 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2668 goto nla_put_failure;
2669 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2670 goto nla_put_failure;
2671 if (set->flags & NFT_SET_MAP) {
2672 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2673 goto nla_put_failure;
2674 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2675 goto nla_put_failure;
2677 if (set->flags & NFT_SET_OBJECT &&
2678 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
2679 goto nla_put_failure;
2682 nla_put_be64(skb, NFTA_SET_TIMEOUT,
2683 cpu_to_be64(jiffies_to_msecs(set->timeout)),
2685 goto nla_put_failure;
2687 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2688 goto nla_put_failure;
2690 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2691 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2692 goto nla_put_failure;
2695 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2696 goto nla_put_failure;
2698 desc = nla_nest_start(skb, NFTA_SET_DESC);
2700 goto nla_put_failure;
2702 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2703 goto nla_put_failure;
2704 nla_nest_end(skb, desc);
2706 nlmsg_end(skb, nlh);
2710 nlmsg_trim(skb, nlh);
2714 static void nf_tables_set_notify(const struct nft_ctx *ctx,
2715 const struct nft_set *set, int event,
2718 struct sk_buff *skb;
2719 u32 portid = ctx->portid;
2723 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2726 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2730 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2736 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
2740 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
2743 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2745 const struct nft_set *set;
2746 unsigned int idx, s_idx = cb->args[0];
2747 struct nft_af_info *afi;
2748 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2749 struct net *net = sock_net(skb->sk);
2750 int cur_family = cb->args[3];
2751 struct nft_ctx *ctx = cb->data, ctx_set;
2757 cb->seq = net->nft.base_seq;
2759 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2760 if (ctx->afi && ctx->afi != afi)
2764 if (afi->family != cur_family)
2769 list_for_each_entry_rcu(table, &afi->tables, list) {
2770 if (ctx->table && ctx->table != table)
2774 if (cur_table != table)
2780 list_for_each_entry_rcu(set, &table->sets, list) {
2783 if (!nft_is_active(net, set))
2787 ctx_set.table = table;
2789 if (nf_tables_fill_set(skb, &ctx_set, set,
2793 cb->args[2] = (unsigned long) table;
2794 cb->args[3] = afi->family;
2797 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2811 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2817 static int nf_tables_getset(struct net *net, struct sock *nlsk,
2818 struct sk_buff *skb, const struct nlmsghdr *nlh,
2819 const struct nlattr * const nla[])
2821 u8 genmask = nft_genmask_cur(net);
2822 const struct nft_set *set;
2824 struct sk_buff *skb2;
2825 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2828 /* Verify existence before starting dump */
2829 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
2833 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2834 struct netlink_dump_control c = {
2835 .dump = nf_tables_dump_sets,
2836 .done = nf_tables_dump_sets_done,
2838 struct nft_ctx *ctx_dump;
2840 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2841 if (ctx_dump == NULL)
2847 return netlink_dump_start(nlsk, skb, nlh, &c);
2850 /* Only accept unspec with dump */
2851 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2852 return -EAFNOSUPPORT;
2853 if (!nla[NFTA_SET_TABLE])
2856 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
2858 return PTR_ERR(set);
2860 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2864 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2868 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2875 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2876 struct nft_set_desc *desc,
2877 const struct nlattr *nla)
2879 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2882 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
2883 nft_set_desc_policy, NULL);
2887 if (da[NFTA_SET_DESC_SIZE] != NULL)
2888 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2893 static int nf_tables_newset(struct net *net, struct sock *nlsk,
2894 struct sk_buff *skb, const struct nlmsghdr *nlh,
2895 const struct nlattr * const nla[])
2897 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2898 u8 genmask = nft_genmask_next(net);
2899 const struct nft_set_ops *ops;
2900 struct nft_af_info *afi;
2901 struct nft_table *table;
2902 struct nft_set *set;
2904 char name[NFT_SET_MAXNAMELEN];
2908 u32 ktype, dtype, flags, policy, gc_int, objtype;
2909 struct nft_set_desc desc;
2910 unsigned char *udata;
2914 if (nla[NFTA_SET_TABLE] == NULL ||
2915 nla[NFTA_SET_NAME] == NULL ||
2916 nla[NFTA_SET_KEY_LEN] == NULL ||
2917 nla[NFTA_SET_ID] == NULL)
2920 memset(&desc, 0, sizeof(desc));
2922 ktype = NFT_DATA_VALUE;
2923 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2924 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2925 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2929 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2930 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
2934 if (nla[NFTA_SET_FLAGS] != NULL) {
2935 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2936 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2937 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2938 NFT_SET_MAP | NFT_SET_EVAL |
2941 /* Only one of these operations is supported */
2942 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
2943 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
2948 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2949 if (!(flags & NFT_SET_MAP))
2952 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2953 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2954 dtype != NFT_DATA_VERDICT)
2957 if (dtype != NFT_DATA_VERDICT) {
2958 if (nla[NFTA_SET_DATA_LEN] == NULL)
2960 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2961 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
2964 desc.dlen = sizeof(struct nft_verdict);
2965 } else if (flags & NFT_SET_MAP)
2968 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
2969 if (!(flags & NFT_SET_OBJECT))
2972 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
2973 if (objtype == NFT_OBJECT_UNSPEC ||
2974 objtype > NFT_OBJECT_MAX)
2976 } else if (flags & NFT_SET_OBJECT)
2979 objtype = NFT_OBJECT_UNSPEC;
2982 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2983 if (!(flags & NFT_SET_TIMEOUT))
2985 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
2986 nla[NFTA_SET_TIMEOUT])));
2989 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2990 if (!(flags & NFT_SET_TIMEOUT))
2992 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2995 policy = NFT_SET_POL_PERFORMANCE;
2996 if (nla[NFTA_SET_POLICY] != NULL)
2997 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2999 if (nla[NFTA_SET_DESC] != NULL) {
3000 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
3005 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
3007 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
3009 return PTR_ERR(afi);
3011 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
3013 return PTR_ERR(table);
3015 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
3017 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
3019 if (PTR_ERR(set) != -ENOENT)
3020 return PTR_ERR(set);
3022 if (nlh->nlmsg_flags & NLM_F_EXCL)
3024 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3029 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3032 ops = nft_select_set_ops(nla, &desc, policy);
3034 return PTR_ERR(ops);
3037 if (nla[NFTA_SET_USERDATA])
3038 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3041 if (ops->privsize != NULL)
3042 size = ops->privsize(nla);
3045 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3049 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
3050 err = nf_tables_set_alloc_name(&ctx, set, name);
3056 udata = set->data + size;
3057 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3060 INIT_LIST_HEAD(&set->bindings);
3063 set->klen = desc.klen;
3065 set->objtype = objtype;
3066 set->dlen = desc.dlen;
3068 set->size = desc.size;
3069 set->policy = policy;
3072 set->timeout = timeout;
3073 set->gc_int = gc_int;
3075 err = ops->init(set, &desc, nla);
3079 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3083 list_add_tail_rcu(&set->list, &table->sets);
3092 module_put(ops->owner);
3096 static void nft_set_destroy(struct nft_set *set)
3098 set->ops->destroy(set);
3099 module_put(set->ops->owner);
3103 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3105 list_del_rcu(&set->list);
3106 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
3107 nft_set_destroy(set);
3110 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3111 struct sk_buff *skb, const struct nlmsghdr *nlh,
3112 const struct nlattr * const nla[])
3114 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3115 u8 genmask = nft_genmask_next(net);
3116 struct nft_set *set;
3120 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3121 return -EAFNOSUPPORT;
3122 if (nla[NFTA_SET_TABLE] == NULL)
3125 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
3129 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3131 return PTR_ERR(set);
3132 if (!list_empty(&set->bindings))
3135 return nft_delset(&ctx, set);
3138 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3139 struct nft_set *set,
3140 const struct nft_set_iter *iter,
3141 struct nft_set_elem *elem)
3143 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3144 enum nft_registers dreg;
3146 dreg = nft_type_to_reg(set->dtype);
3147 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3148 set->dtype == NFT_DATA_VERDICT ?
3149 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3153 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3154 struct nft_set_binding *binding)
3156 struct nft_set_binding *i;
3157 struct nft_set_iter iter;
3159 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
3162 if (binding->flags & NFT_SET_MAP) {
3163 /* If the set is already bound to the same chain all
3164 * jumps are already validated for that chain.
3166 list_for_each_entry(i, &set->bindings, list) {
3167 if (i->flags & NFT_SET_MAP &&
3168 i->chain == binding->chain)
3172 iter.genmask = nft_genmask_next(ctx->net);
3176 iter.fn = nf_tables_bind_check_setelem;
3178 set->ops->walk(ctx, set, &iter);
3183 binding->chain = ctx->chain;
3184 list_add_tail_rcu(&binding->list, &set->bindings);
3187 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3189 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3190 struct nft_set_binding *binding)
3192 list_del_rcu(&binding->list);
3194 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
3195 nft_is_active(ctx->net, set))
3196 nf_tables_set_destroy(ctx, set);
3198 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3200 const struct nft_set_ext_type nft_set_ext_types[] = {
3201 [NFT_SET_EXT_KEY] = {
3202 .align = __alignof__(u32),
3204 [NFT_SET_EXT_DATA] = {
3205 .align = __alignof__(u32),
3207 [NFT_SET_EXT_EXPR] = {
3208 .align = __alignof__(struct nft_expr),
3210 [NFT_SET_EXT_OBJREF] = {
3211 .len = sizeof(struct nft_object *),
3212 .align = __alignof__(struct nft_object *),
3214 [NFT_SET_EXT_FLAGS] = {
3216 .align = __alignof__(u8),
3218 [NFT_SET_EXT_TIMEOUT] = {
3220 .align = __alignof__(u64),
3222 [NFT_SET_EXT_EXPIRATION] = {
3223 .len = sizeof(unsigned long),
3224 .align = __alignof__(unsigned long),
3226 [NFT_SET_EXT_USERDATA] = {
3227 .len = sizeof(struct nft_userdata),
3228 .align = __alignof__(struct nft_userdata),
3231 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3237 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3238 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3239 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3240 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3241 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3242 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3243 .len = NFT_USERDATA_MAXLEN },
3246 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3247 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3248 .len = NFT_TABLE_MAXNAMELEN - 1 },
3249 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3250 .len = NFT_SET_MAXNAMELEN - 1 },
3251 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3252 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3255 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3256 const struct sk_buff *skb,
3257 const struct nlmsghdr *nlh,
3258 const struct nlattr * const nla[],
3261 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3262 struct nft_af_info *afi;
3263 struct nft_table *table;
3265 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3267 return PTR_ERR(afi);
3269 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3272 return PTR_ERR(table);
3274 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
3278 static int nf_tables_fill_setelem(struct sk_buff *skb,
3279 const struct nft_set *set,
3280 const struct nft_set_elem *elem)
3282 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3283 unsigned char *b = skb_tail_pointer(skb);
3284 struct nlattr *nest;
3286 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3288 goto nla_put_failure;
3290 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3291 NFT_DATA_VALUE, set->klen) < 0)
3292 goto nla_put_failure;
3294 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3295 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3296 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3298 goto nla_put_failure;
3300 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3301 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3302 goto nla_put_failure;
3304 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3305 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3306 (*nft_set_ext_obj(ext))->name) < 0)
3307 goto nla_put_failure;
3309 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3310 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3311 htonl(*nft_set_ext_flags(ext))))
3312 goto nla_put_failure;
3314 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3315 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3316 cpu_to_be64(jiffies_to_msecs(
3317 *nft_set_ext_timeout(ext))),
3319 goto nla_put_failure;
3321 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3322 unsigned long expires, now = jiffies;
3324 expires = *nft_set_ext_expiration(ext);
3325 if (time_before(now, expires))
3330 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3331 cpu_to_be64(jiffies_to_msecs(expires)),
3333 goto nla_put_failure;
3336 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3337 struct nft_userdata *udata;
3339 udata = nft_set_ext_userdata(ext);
3340 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3341 udata->len + 1, udata->data))
3342 goto nla_put_failure;
3345 nla_nest_end(skb, nest);
3353 struct nft_set_dump_args {
3354 const struct netlink_callback *cb;
3355 struct nft_set_iter iter;
3356 struct sk_buff *skb;
3359 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3360 struct nft_set *set,
3361 const struct nft_set_iter *iter,
3362 struct nft_set_elem *elem)
3364 struct nft_set_dump_args *args;
3366 args = container_of(iter, struct nft_set_dump_args, iter);
3367 return nf_tables_fill_setelem(args->skb, set, elem);
3370 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3372 struct net *net = sock_net(skb->sk);
3373 u8 genmask = nft_genmask_cur(net);
3374 struct nft_set *set;
3375 struct nft_set_dump_args args;
3377 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3378 struct nfgenmsg *nfmsg;
3379 struct nlmsghdr *nlh;
3380 struct nlattr *nest;
3384 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3385 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy,
3390 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
3391 (void *)nla, genmask);
3395 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3398 return PTR_ERR(set);
3400 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
3401 portid = NETLINK_CB(cb->skb).portid;
3402 seq = cb->nlh->nlmsg_seq;
3404 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3407 goto nla_put_failure;
3409 nfmsg = nlmsg_data(nlh);
3410 nfmsg->nfgen_family = ctx.afi->family;
3411 nfmsg->version = NFNETLINK_V0;
3412 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
3414 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3415 goto nla_put_failure;
3416 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3417 goto nla_put_failure;
3419 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3421 goto nla_put_failure;
3425 args.iter.genmask = nft_genmask_cur(ctx.net);
3426 args.iter.skip = cb->args[0];
3427 args.iter.count = 0;
3429 args.iter.fn = nf_tables_dump_setelem;
3430 set->ops->walk(&ctx, set, &args.iter);
3432 nla_nest_end(skb, nest);
3433 nlmsg_end(skb, nlh);
3435 if (args.iter.err && args.iter.err != -EMSGSIZE)
3436 return args.iter.err;
3437 if (args.iter.count == cb->args[0])
3440 cb->args[0] = args.iter.count;
3447 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3448 struct sk_buff *skb, const struct nlmsghdr *nlh,
3449 const struct nlattr * const nla[])
3451 u8 genmask = nft_genmask_cur(net);
3452 const struct nft_set *set;
3456 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3460 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3463 return PTR_ERR(set);
3465 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3466 struct netlink_dump_control c = {
3467 .dump = nf_tables_dump_set,
3469 return netlink_dump_start(nlsk, skb, nlh, &c);
3474 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3475 const struct nft_ctx *ctx, u32 seq,
3476 u32 portid, int event, u16 flags,
3477 const struct nft_set *set,
3478 const struct nft_set_elem *elem)
3480 struct nfgenmsg *nfmsg;
3481 struct nlmsghdr *nlh;
3482 struct nlattr *nest;
3485 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3486 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3489 goto nla_put_failure;
3491 nfmsg = nlmsg_data(nlh);
3492 nfmsg->nfgen_family = ctx->afi->family;
3493 nfmsg->version = NFNETLINK_V0;
3494 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3496 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3497 goto nla_put_failure;
3498 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3499 goto nla_put_failure;
3501 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3503 goto nla_put_failure;
3505 err = nf_tables_fill_setelem(skb, set, elem);
3507 goto nla_put_failure;
3509 nla_nest_end(skb, nest);
3511 nlmsg_end(skb, nlh);
3515 nlmsg_trim(skb, nlh);
3519 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
3520 const struct nft_set *set,
3521 const struct nft_set_elem *elem,
3522 int event, u16 flags)
3524 struct net *net = ctx->net;
3525 u32 portid = ctx->portid;
3526 struct sk_buff *skb;
3529 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3532 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3536 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3543 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3547 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3550 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3552 struct nft_set *set)
3554 struct nft_trans *trans;
3556 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3560 nft_trans_elem_set(trans) = set;
3564 void *nft_set_elem_init(const struct nft_set *set,
3565 const struct nft_set_ext_tmpl *tmpl,
3566 const u32 *key, const u32 *data,
3567 u64 timeout, gfp_t gfp)
3569 struct nft_set_ext *ext;
3572 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3576 ext = nft_set_elem_ext(set, elem);
3577 nft_set_ext_init(ext, tmpl);
3579 memcpy(nft_set_ext_key(ext), key, set->klen);
3580 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3581 memcpy(nft_set_ext_data(ext), data, set->dlen);
3582 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3583 *nft_set_ext_expiration(ext) =
3585 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3586 *nft_set_ext_timeout(ext) = timeout;
3591 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
3594 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3596 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3597 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3598 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
3599 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3600 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3601 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
3602 (*nft_set_ext_obj(ext))->use--;
3605 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3607 static int nft_setelem_parse_flags(const struct nft_set *set,
3608 const struct nlattr *attr, u32 *flags)
3613 *flags = ntohl(nla_get_be32(attr));
3614 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3616 if (!(set->flags & NFT_SET_INTERVAL) &&
3617 *flags & NFT_SET_ELEM_INTERVAL_END)
3623 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3624 const struct nlattr *attr, u32 nlmsg_flags)
3626 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3627 u8 genmask = nft_genmask_next(ctx->net);
3628 struct nft_data_desc d1, d2;
3629 struct nft_set_ext_tmpl tmpl;
3630 struct nft_set_ext *ext, *ext2;
3631 struct nft_set_elem elem;
3632 struct nft_set_binding *binding;
3633 struct nft_object *obj = NULL;
3634 struct nft_userdata *udata;
3635 struct nft_data data;
3636 enum nft_registers dreg;
3637 struct nft_trans *trans;
3643 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3644 nft_set_elem_policy, NULL);
3648 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3651 nft_set_ext_prepare(&tmpl);
3653 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3657 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3659 if (set->flags & NFT_SET_MAP) {
3660 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3661 !(flags & NFT_SET_ELEM_INTERVAL_END))
3663 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3664 flags & NFT_SET_ELEM_INTERVAL_END)
3667 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3672 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3673 if (!(set->flags & NFT_SET_TIMEOUT))
3675 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3676 nla[NFTA_SET_ELEM_TIMEOUT])));
3677 } else if (set->flags & NFT_SET_TIMEOUT) {
3678 timeout = set->timeout;
3681 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3682 nla[NFTA_SET_ELEM_KEY]);
3686 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3689 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3691 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3692 if (timeout != set->timeout)
3693 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3696 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
3697 if (!(set->flags & NFT_SET_OBJECT)) {
3701 obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
3702 set->objtype, genmask);
3707 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
3710 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3711 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3712 nla[NFTA_SET_ELEM_DATA]);
3717 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3720 dreg = nft_type_to_reg(set->dtype);
3721 list_for_each_entry(binding, &set->bindings, list) {
3722 struct nft_ctx bind_ctx = {
3725 .table = ctx->table,
3726 .chain = (struct nft_chain *)binding->chain,
3729 if (!(binding->flags & NFT_SET_MAP))
3732 err = nft_validate_register_store(&bind_ctx, dreg,
3739 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
3742 /* The full maximum length of userdata can exceed the maximum
3743 * offset value (U8_MAX) for following extensions, therefor it
3744 * must be the last extension added.
3747 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3748 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3750 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3755 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
3756 timeout, GFP_KERNEL);
3757 if (elem.priv == NULL)
3760 ext = nft_set_elem_ext(set, elem.priv);
3762 *nft_set_ext_flags(ext) = flags;
3764 udata = nft_set_ext_userdata(ext);
3765 udata->len = ulen - 1;
3766 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3769 *nft_set_ext_obj(ext) = obj;
3773 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3777 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
3778 err = set->ops->insert(ctx->net, set, &elem, &ext2);
3780 if (err == -EEXIST) {
3781 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
3782 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
3783 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
3784 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
3786 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3787 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
3788 memcmp(nft_set_ext_data(ext),
3789 nft_set_ext_data(ext2), set->dlen) != 0) ||
3790 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3791 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
3792 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
3794 else if (!(nlmsg_flags & NLM_F_EXCL))
3801 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
3806 nft_trans_elem(trans) = elem;
3807 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3811 set->ops->remove(ctx->net, set, &elem);
3817 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3818 nft_data_uninit(&data, d2.type);
3820 nft_data_uninit(&elem.key.val, d1.type);
3825 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3826 struct sk_buff *skb, const struct nlmsghdr *nlh,
3827 const struct nlattr * const nla[])
3829 u8 genmask = nft_genmask_next(net);
3830 const struct nlattr *attr;
3831 struct nft_set *set;
3835 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3838 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3842 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3845 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3846 set = nf_tables_set_lookup_byid(net,
3847 nla[NFTA_SET_ELEM_LIST_SET_ID],
3851 return PTR_ERR(set);
3854 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3857 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3858 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
3865 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3866 const struct nlattr *attr)
3868 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3869 struct nft_set_ext_tmpl tmpl;
3870 struct nft_data_desc desc;
3871 struct nft_set_elem elem;
3872 struct nft_set_ext *ext;
3873 struct nft_trans *trans;
3878 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3879 nft_set_elem_policy, NULL);
3884 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3887 nft_set_ext_prepare(&tmpl);
3889 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3893 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3895 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3896 nla[NFTA_SET_ELEM_KEY]);
3901 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3904 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3907 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3909 if (elem.priv == NULL)
3912 ext = nft_set_elem_ext(set, elem.priv);
3914 *nft_set_ext_flags(ext) = flags;
3916 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3917 if (trans == NULL) {
3922 priv = set->ops->deactivate(ctx->net, set, &elem);
3930 nft_trans_elem(trans) = elem;
3931 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3939 nft_data_uninit(&elem.key.val, desc.type);
3944 static int nft_flush_set(const struct nft_ctx *ctx,
3945 struct nft_set *set,
3946 const struct nft_set_iter *iter,
3947 struct nft_set_elem *elem)
3949 struct nft_trans *trans;
3952 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
3953 sizeof(struct nft_trans_elem), GFP_ATOMIC);
3957 if (!set->ops->flush(ctx->net, set, elem->priv)) {
3963 nft_trans_elem_set(trans) = set;
3964 nft_trans_elem(trans) = *elem;
3965 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3973 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3974 struct sk_buff *skb, const struct nlmsghdr *nlh,
3975 const struct nlattr * const nla[])
3977 u8 genmask = nft_genmask_next(net);
3978 const struct nlattr *attr;
3979 struct nft_set *set;
3983 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3987 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3990 return PTR_ERR(set);
3991 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3994 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
3995 struct nft_set_iter iter = {
3997 .fn = nft_flush_set,
3999 set->ops->walk(&ctx, set, &iter);
4004 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4005 err = nft_del_setelem(&ctx, set, attr);
4014 void nft_set_gc_batch_release(struct rcu_head *rcu)
4016 struct nft_set_gc_batch *gcb;
4019 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4020 for (i = 0; i < gcb->head.cnt; i++)
4021 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
4024 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4026 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4029 struct nft_set_gc_batch *gcb;
4031 gcb = kzalloc(sizeof(*gcb), gfp);
4034 gcb->head.set = set;
4037 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4044 * nft_register_obj- register nf_tables stateful object type
4047 * Registers the object type for use with nf_tables. Returns zero on
4048 * success or a negative errno code otherwise.
4050 int nft_register_obj(struct nft_object_type *obj_type)
4052 if (obj_type->type == NFT_OBJECT_UNSPEC)
4055 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4056 list_add_rcu(&obj_type->list, &nf_tables_objects);
4057 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4060 EXPORT_SYMBOL_GPL(nft_register_obj);
4063 * nft_unregister_obj - unregister nf_tables object type
4066 * Unregisters the object type for use with nf_tables.
4068 void nft_unregister_obj(struct nft_object_type *obj_type)
4070 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4071 list_del_rcu(&obj_type->list);
4072 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4074 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4076 struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
4077 const struct nlattr *nla,
4078 u32 objtype, u8 genmask)
4080 struct nft_object *obj;
4082 list_for_each_entry(obj, &table->objects, list) {
4083 if (!nla_strcmp(nla, obj->name) &&
4084 objtype == obj->type->type &&
4085 nft_active_genmask(obj, genmask))
4088 return ERR_PTR(-ENOENT);
4090 EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
4092 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4093 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4094 .len = NFT_TABLE_MAXNAMELEN - 1 },
4095 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4096 .len = NFT_OBJ_MAXNAMELEN - 1 },
4097 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4098 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4101 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4102 const struct nft_object_type *type,
4103 const struct nlattr *attr)
4105 struct nlattr *tb[type->maxattr + 1];
4106 struct nft_object *obj;
4110 err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
4115 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4119 obj = kzalloc(sizeof(struct nft_object) + type->size, GFP_KERNEL);
4123 err = type->init(ctx, (const struct nlattr * const *)tb, obj);
4132 return ERR_PTR(err);
4135 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
4136 struct nft_object *obj, bool reset)
4138 struct nlattr *nest;
4140 nest = nla_nest_start(skb, attr);
4142 goto nla_put_failure;
4143 if (obj->type->dump(skb, obj, reset) < 0)
4144 goto nla_put_failure;
4145 nla_nest_end(skb, nest);
4152 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4154 const struct nft_object_type *type;
4156 list_for_each_entry(type, &nf_tables_objects, list) {
4157 if (objtype == type->type)
4163 static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4165 const struct nft_object_type *type;
4167 type = __nft_obj_type_get(objtype);
4168 if (type != NULL && try_module_get(type->owner))
4171 #ifdef CONFIG_MODULES
4173 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4174 request_module("nft-obj-%u", objtype);
4175 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4176 if (__nft_obj_type_get(objtype))
4177 return ERR_PTR(-EAGAIN);
4180 return ERR_PTR(-ENOENT);
4183 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4184 struct sk_buff *skb, const struct nlmsghdr *nlh,
4185 const struct nlattr * const nla[])
4187 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4188 const struct nft_object_type *type;
4189 u8 genmask = nft_genmask_next(net);
4190 int family = nfmsg->nfgen_family;
4191 struct nft_af_info *afi;
4192 struct nft_table *table;
4193 struct nft_object *obj;
4198 if (!nla[NFTA_OBJ_TYPE] ||
4199 !nla[NFTA_OBJ_NAME] ||
4200 !nla[NFTA_OBJ_DATA])
4203 afi = nf_tables_afinfo_lookup(net, family, true);
4205 return PTR_ERR(afi);
4207 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4209 return PTR_ERR(table);
4211 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4212 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4219 if (nlh->nlmsg_flags & NLM_F_EXCL)
4225 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4227 type = nft_obj_type_get(objtype);
4229 return PTR_ERR(type);
4231 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
4237 nla_strlcpy(obj->name, nla[NFTA_OBJ_NAME], NFT_OBJ_MAXNAMELEN);
4239 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4243 list_add_tail_rcu(&obj->list, &table->objects);
4247 if (obj->type->destroy)
4248 obj->type->destroy(obj);
4251 module_put(type->owner);
4255 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4256 u32 portid, u32 seq, int event, u32 flags,
4257 int family, const struct nft_table *table,
4258 struct nft_object *obj, bool reset)
4260 struct nfgenmsg *nfmsg;
4261 struct nlmsghdr *nlh;
4263 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4264 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4266 goto nla_put_failure;
4268 nfmsg = nlmsg_data(nlh);
4269 nfmsg->nfgen_family = family;
4270 nfmsg->version = NFNETLINK_V0;
4271 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4273 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4274 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
4275 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->type->type)) ||
4276 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
4277 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
4278 goto nla_put_failure;
4280 nlmsg_end(skb, nlh);
4284 nlmsg_trim(skb, nlh);
4288 struct nft_obj_filter {
4289 char table[NFT_OBJ_MAXNAMELEN];
4293 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4295 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4296 const struct nft_af_info *afi;
4297 const struct nft_table *table;
4298 unsigned int idx = 0, s_idx = cb->args[0];
4299 struct nft_obj_filter *filter = cb->data;
4300 struct net *net = sock_net(skb->sk);
4301 int family = nfmsg->nfgen_family;
4302 struct nft_object *obj;
4305 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4309 cb->seq = net->nft.base_seq;
4311 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
4312 if (family != NFPROTO_UNSPEC && family != afi->family)
4315 list_for_each_entry_rcu(table, &afi->tables, list) {
4316 list_for_each_entry_rcu(obj, &table->objects, list) {
4317 if (!nft_is_active(net, obj))
4322 memset(&cb->args[1], 0,
4323 sizeof(cb->args) - sizeof(cb->args[0]));
4324 if (filter && filter->table[0] &&
4325 strcmp(filter->table, table->name))
4328 filter->type != NFT_OBJECT_UNSPEC &&
4329 obj->type->type != filter->type)
4332 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4335 NLM_F_MULTI | NLM_F_APPEND,
4336 afi->family, table, obj, reset) < 0)
4339 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4352 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4359 static struct nft_obj_filter *
4360 nft_obj_filter_alloc(const struct nlattr * const nla[])
4362 struct nft_obj_filter *filter;
4364 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
4366 return ERR_PTR(-ENOMEM);
4368 if (nla[NFTA_OBJ_TABLE])
4369 nla_strlcpy(filter->table, nla[NFTA_OBJ_TABLE],
4370 NFT_TABLE_MAXNAMELEN);
4371 if (nla[NFTA_OBJ_TYPE])
4372 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4377 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
4378 struct sk_buff *skb, const struct nlmsghdr *nlh,
4379 const struct nlattr * const nla[])
4381 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4382 u8 genmask = nft_genmask_cur(net);
4383 int family = nfmsg->nfgen_family;
4384 const struct nft_af_info *afi;
4385 const struct nft_table *table;
4386 struct nft_object *obj;
4387 struct sk_buff *skb2;
4392 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4393 struct netlink_dump_control c = {
4394 .dump = nf_tables_dump_obj,
4395 .done = nf_tables_dump_obj_done,
4398 if (nla[NFTA_OBJ_TABLE] ||
4399 nla[NFTA_OBJ_TYPE]) {
4400 struct nft_obj_filter *filter;
4402 filter = nft_obj_filter_alloc(nla);
4408 return netlink_dump_start(nlsk, skb, nlh, &c);
4411 if (!nla[NFTA_OBJ_NAME] ||
4412 !nla[NFTA_OBJ_TYPE])
4415 afi = nf_tables_afinfo_lookup(net, family, false);
4417 return PTR_ERR(afi);
4419 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4421 return PTR_ERR(table);
4423 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4424 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4426 return PTR_ERR(obj);
4428 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4432 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4435 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
4436 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
4437 family, table, obj, reset);
4441 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4447 static void nft_obj_destroy(struct nft_object *obj)
4449 if (obj->type->destroy)
4450 obj->type->destroy(obj);
4452 module_put(obj->type->owner);
4456 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
4457 struct sk_buff *skb, const struct nlmsghdr *nlh,
4458 const struct nlattr * const nla[])
4460 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4461 u8 genmask = nft_genmask_next(net);
4462 int family = nfmsg->nfgen_family;
4463 struct nft_af_info *afi;
4464 struct nft_table *table;
4465 struct nft_object *obj;
4469 if (!nla[NFTA_OBJ_TYPE] ||
4470 !nla[NFTA_OBJ_NAME])
4473 afi = nf_tables_afinfo_lookup(net, family, true);
4475 return PTR_ERR(afi);
4477 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4479 return PTR_ERR(table);
4481 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4482 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4484 return PTR_ERR(obj);
4488 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4490 return nft_delobj(&ctx, obj);
4493 void nft_obj_notify(struct net *net, struct nft_table *table,
4494 struct nft_object *obj, u32 portid, u32 seq, int event,
4495 int family, int report, gfp_t gfp)
4497 struct sk_buff *skb;
4501 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4504 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
4508 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
4515 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
4518 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4520 EXPORT_SYMBOL_GPL(nft_obj_notify);
4522 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
4523 struct nft_object *obj, int event)
4525 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
4526 ctx->afi->family, ctx->report, GFP_KERNEL);
4529 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
4530 u32 portid, u32 seq)
4532 struct nlmsghdr *nlh;
4533 struct nfgenmsg *nfmsg;
4534 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
4536 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
4538 goto nla_put_failure;
4540 nfmsg = nlmsg_data(nlh);
4541 nfmsg->nfgen_family = AF_UNSPEC;
4542 nfmsg->version = NFNETLINK_V0;
4543 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4545 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
4546 goto nla_put_failure;
4548 nlmsg_end(skb, nlh);
4552 nlmsg_trim(skb, nlh);
4556 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
4559 struct nlmsghdr *nlh = nlmsg_hdr(skb);
4560 struct sk_buff *skb2;
4563 if (nlmsg_report(nlh) &&
4564 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4567 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4571 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4578 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4579 nlmsg_report(nlh), GFP_KERNEL);
4582 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4586 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
4587 struct sk_buff *skb, const struct nlmsghdr *nlh,
4588 const struct nlattr * const nla[])
4590 struct sk_buff *skb2;
4593 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4597 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4602 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4608 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
4609 [NFT_MSG_NEWTABLE] = {
4610 .call_batch = nf_tables_newtable,
4611 .attr_count = NFTA_TABLE_MAX,
4612 .policy = nft_table_policy,
4614 [NFT_MSG_GETTABLE] = {
4615 .call = nf_tables_gettable,
4616 .attr_count = NFTA_TABLE_MAX,
4617 .policy = nft_table_policy,
4619 [NFT_MSG_DELTABLE] = {
4620 .call_batch = nf_tables_deltable,
4621 .attr_count = NFTA_TABLE_MAX,
4622 .policy = nft_table_policy,
4624 [NFT_MSG_NEWCHAIN] = {
4625 .call_batch = nf_tables_newchain,
4626 .attr_count = NFTA_CHAIN_MAX,
4627 .policy = nft_chain_policy,
4629 [NFT_MSG_GETCHAIN] = {
4630 .call = nf_tables_getchain,
4631 .attr_count = NFTA_CHAIN_MAX,
4632 .policy = nft_chain_policy,
4634 [NFT_MSG_DELCHAIN] = {
4635 .call_batch = nf_tables_delchain,
4636 .attr_count = NFTA_CHAIN_MAX,
4637 .policy = nft_chain_policy,
4639 [NFT_MSG_NEWRULE] = {
4640 .call_batch = nf_tables_newrule,
4641 .attr_count = NFTA_RULE_MAX,
4642 .policy = nft_rule_policy,
4644 [NFT_MSG_GETRULE] = {
4645 .call = nf_tables_getrule,
4646 .attr_count = NFTA_RULE_MAX,
4647 .policy = nft_rule_policy,
4649 [NFT_MSG_DELRULE] = {
4650 .call_batch = nf_tables_delrule,
4651 .attr_count = NFTA_RULE_MAX,
4652 .policy = nft_rule_policy,
4654 [NFT_MSG_NEWSET] = {
4655 .call_batch = nf_tables_newset,
4656 .attr_count = NFTA_SET_MAX,
4657 .policy = nft_set_policy,
4659 [NFT_MSG_GETSET] = {
4660 .call = nf_tables_getset,
4661 .attr_count = NFTA_SET_MAX,
4662 .policy = nft_set_policy,
4664 [NFT_MSG_DELSET] = {
4665 .call_batch = nf_tables_delset,
4666 .attr_count = NFTA_SET_MAX,
4667 .policy = nft_set_policy,
4669 [NFT_MSG_NEWSETELEM] = {
4670 .call_batch = nf_tables_newsetelem,
4671 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4672 .policy = nft_set_elem_list_policy,
4674 [NFT_MSG_GETSETELEM] = {
4675 .call = nf_tables_getsetelem,
4676 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4677 .policy = nft_set_elem_list_policy,
4679 [NFT_MSG_DELSETELEM] = {
4680 .call_batch = nf_tables_delsetelem,
4681 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4682 .policy = nft_set_elem_list_policy,
4684 [NFT_MSG_GETGEN] = {
4685 .call = nf_tables_getgen,
4687 [NFT_MSG_NEWOBJ] = {
4688 .call_batch = nf_tables_newobj,
4689 .attr_count = NFTA_OBJ_MAX,
4690 .policy = nft_obj_policy,
4692 [NFT_MSG_GETOBJ] = {
4693 .call = nf_tables_getobj,
4694 .attr_count = NFTA_OBJ_MAX,
4695 .policy = nft_obj_policy,
4697 [NFT_MSG_DELOBJ] = {
4698 .call_batch = nf_tables_delobj,
4699 .attr_count = NFTA_OBJ_MAX,
4700 .policy = nft_obj_policy,
4702 [NFT_MSG_GETOBJ_RESET] = {
4703 .call = nf_tables_getobj,
4704 .attr_count = NFTA_OBJ_MAX,
4705 .policy = nft_obj_policy,
4709 static void nft_chain_commit_update(struct nft_trans *trans)
4711 struct nft_base_chain *basechain;
4713 if (nft_trans_chain_name(trans)[0])
4714 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
4716 if (!nft_is_base_chain(trans->ctx.chain))
4719 basechain = nft_base_chain(trans->ctx.chain);
4720 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
4722 switch (nft_trans_chain_policy(trans)) {
4725 basechain->policy = nft_trans_chain_policy(trans);
4730 static void nf_tables_commit_release(struct nft_trans *trans)
4732 switch (trans->msg_type) {
4733 case NFT_MSG_DELTABLE:
4734 nf_tables_table_destroy(&trans->ctx);
4736 case NFT_MSG_DELCHAIN:
4737 nf_tables_chain_destroy(trans->ctx.chain);
4739 case NFT_MSG_DELRULE:
4740 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4742 case NFT_MSG_DELSET:
4743 nft_set_destroy(nft_trans_set(trans));
4745 case NFT_MSG_DELSETELEM:
4746 nft_set_elem_destroy(nft_trans_elem_set(trans),
4747 nft_trans_elem(trans).priv, true);
4749 case NFT_MSG_DELOBJ:
4750 nft_obj_destroy(nft_trans_obj(trans));
4756 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
4758 struct nft_trans *trans, *next;
4759 struct nft_trans_elem *te;
4761 /* Bump generation counter, invalidate any dump in progress */
4762 while (++net->nft.base_seq == 0);
4764 /* A new generation has just started */
4765 net->nft.gencursor = nft_gencursor_next(net);
4767 /* Make sure all packets have left the previous generation before
4768 * purging old rules.
4772 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4773 switch (trans->msg_type) {
4774 case NFT_MSG_NEWTABLE:
4775 if (nft_trans_table_update(trans)) {
4776 if (!nft_trans_table_enable(trans)) {
4777 nf_tables_table_disable(net,
4780 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4783 nft_clear(net, trans->ctx.table);
4785 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
4786 nft_trans_destroy(trans);
4788 case NFT_MSG_DELTABLE:
4789 list_del_rcu(&trans->ctx.table->list);
4790 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
4792 case NFT_MSG_NEWCHAIN:
4793 if (nft_trans_chain_update(trans))
4794 nft_chain_commit_update(trans);
4796 nft_clear(net, trans->ctx.chain);
4798 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
4799 nft_trans_destroy(trans);
4801 case NFT_MSG_DELCHAIN:
4802 list_del_rcu(&trans->ctx.chain->list);
4803 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
4804 nf_tables_unregister_hooks(trans->ctx.net,
4807 trans->ctx.afi->nops);
4809 case NFT_MSG_NEWRULE:
4810 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4811 nf_tables_rule_notify(&trans->ctx,
4812 nft_trans_rule(trans),
4814 nft_trans_destroy(trans);
4816 case NFT_MSG_DELRULE:
4817 list_del_rcu(&nft_trans_rule(trans)->list);
4818 nf_tables_rule_notify(&trans->ctx,
4819 nft_trans_rule(trans),
4822 case NFT_MSG_NEWSET:
4823 nft_clear(net, nft_trans_set(trans));
4824 /* This avoids hitting -EBUSY when deleting the table
4825 * from the transaction.
4827 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4828 !list_empty(&nft_trans_set(trans)->bindings))
4829 trans->ctx.table->use--;
4831 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4832 NFT_MSG_NEWSET, GFP_KERNEL);
4833 nft_trans_destroy(trans);
4835 case NFT_MSG_DELSET:
4836 list_del_rcu(&nft_trans_set(trans)->list);
4837 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4838 NFT_MSG_DELSET, GFP_KERNEL);
4840 case NFT_MSG_NEWSETELEM:
4841 te = (struct nft_trans_elem *)trans->data;
4843 te->set->ops->activate(net, te->set, &te->elem);
4844 nf_tables_setelem_notify(&trans->ctx, te->set,
4846 NFT_MSG_NEWSETELEM, 0);
4847 nft_trans_destroy(trans);
4849 case NFT_MSG_DELSETELEM:
4850 te = (struct nft_trans_elem *)trans->data;
4852 nf_tables_setelem_notify(&trans->ctx, te->set,
4854 NFT_MSG_DELSETELEM, 0);
4855 te->set->ops->remove(net, te->set, &te->elem);
4856 atomic_dec(&te->set->nelems);
4859 case NFT_MSG_NEWOBJ:
4860 nft_clear(net, nft_trans_obj(trans));
4861 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4863 nft_trans_destroy(trans);
4865 case NFT_MSG_DELOBJ:
4866 list_del_rcu(&nft_trans_obj(trans)->list);
4867 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4875 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4876 list_del(&trans->list);
4877 nf_tables_commit_release(trans);
4880 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
4885 static void nf_tables_abort_release(struct nft_trans *trans)
4887 switch (trans->msg_type) {
4888 case NFT_MSG_NEWTABLE:
4889 nf_tables_table_destroy(&trans->ctx);
4891 case NFT_MSG_NEWCHAIN:
4892 nf_tables_chain_destroy(trans->ctx.chain);
4894 case NFT_MSG_NEWRULE:
4895 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4897 case NFT_MSG_NEWSET:
4898 nft_set_destroy(nft_trans_set(trans));
4900 case NFT_MSG_NEWSETELEM:
4901 nft_set_elem_destroy(nft_trans_elem_set(trans),
4902 nft_trans_elem(trans).priv, true);
4904 case NFT_MSG_NEWOBJ:
4905 nft_obj_destroy(nft_trans_obj(trans));
4911 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
4913 struct nft_trans *trans, *next;
4914 struct nft_trans_elem *te;
4916 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4918 switch (trans->msg_type) {
4919 case NFT_MSG_NEWTABLE:
4920 if (nft_trans_table_update(trans)) {
4921 if (nft_trans_table_enable(trans)) {
4922 nf_tables_table_disable(net,
4925 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4927 nft_trans_destroy(trans);
4929 list_del_rcu(&trans->ctx.table->list);
4932 case NFT_MSG_DELTABLE:
4933 nft_clear(trans->ctx.net, trans->ctx.table);
4934 nft_trans_destroy(trans);
4936 case NFT_MSG_NEWCHAIN:
4937 if (nft_trans_chain_update(trans)) {
4938 free_percpu(nft_trans_chain_stats(trans));
4940 nft_trans_destroy(trans);
4942 trans->ctx.table->use--;
4943 list_del_rcu(&trans->ctx.chain->list);
4944 nf_tables_unregister_hooks(trans->ctx.net,
4947 trans->ctx.afi->nops);
4950 case NFT_MSG_DELCHAIN:
4951 trans->ctx.table->use++;
4952 nft_clear(trans->ctx.net, trans->ctx.chain);
4953 nft_trans_destroy(trans);
4955 case NFT_MSG_NEWRULE:
4956 trans->ctx.chain->use--;
4957 list_del_rcu(&nft_trans_rule(trans)->list);
4959 case NFT_MSG_DELRULE:
4960 trans->ctx.chain->use++;
4961 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4962 nft_trans_destroy(trans);
4964 case NFT_MSG_NEWSET:
4965 trans->ctx.table->use--;
4966 list_del_rcu(&nft_trans_set(trans)->list);
4968 case NFT_MSG_DELSET:
4969 trans->ctx.table->use++;
4970 nft_clear(trans->ctx.net, nft_trans_set(trans));
4971 nft_trans_destroy(trans);
4973 case NFT_MSG_NEWSETELEM:
4974 te = (struct nft_trans_elem *)trans->data;
4976 te->set->ops->remove(net, te->set, &te->elem);
4977 atomic_dec(&te->set->nelems);
4979 case NFT_MSG_DELSETELEM:
4980 te = (struct nft_trans_elem *)trans->data;
4982 te->set->ops->activate(net, te->set, &te->elem);
4985 nft_trans_destroy(trans);
4987 case NFT_MSG_NEWOBJ:
4988 trans->ctx.table->use--;
4989 list_del_rcu(&nft_trans_obj(trans)->list);
4991 case NFT_MSG_DELOBJ:
4992 trans->ctx.table->use++;
4993 nft_clear(trans->ctx.net, nft_trans_obj(trans));
4994 nft_trans_destroy(trans);
5001 list_for_each_entry_safe_reverse(trans, next,
5002 &net->nft.commit_list, list) {
5003 list_del(&trans->list);
5004 nf_tables_abort_release(trans);
5010 static bool nf_tables_valid_genid(struct net *net, u32 genid)
5012 return net->nft.base_seq == genid;
5015 static const struct nfnetlink_subsystem nf_tables_subsys = {
5016 .name = "nf_tables",
5017 .subsys_id = NFNL_SUBSYS_NFTABLES,
5018 .cb_count = NFT_MSG_MAX,
5020 .commit = nf_tables_commit,
5021 .abort = nf_tables_abort,
5022 .valid_genid = nf_tables_valid_genid,
5025 int nft_chain_validate_dependency(const struct nft_chain *chain,
5026 enum nft_chain_type type)
5028 const struct nft_base_chain *basechain;
5030 if (nft_is_base_chain(chain)) {
5031 basechain = nft_base_chain(chain);
5032 if (basechain->type->type != type)
5037 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
5039 int nft_chain_validate_hooks(const struct nft_chain *chain,
5040 unsigned int hook_flags)
5042 struct nft_base_chain *basechain;
5044 if (nft_is_base_chain(chain)) {
5045 basechain = nft_base_chain(chain);
5047 if ((1 << basechain->ops[0].hooknum) & hook_flags)
5055 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
5058 * Loop detection - walk through the ruleset beginning at the destination chain
5059 * of a new jump until either the source chain is reached (loop) or all
5060 * reachable chains have been traversed.
5062 * The loop check is performed whenever a new jump verdict is added to an
5063 * expression or verdict map or a verdict map is bound to a new chain.
5066 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5067 const struct nft_chain *chain);
5069 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
5070 struct nft_set *set,
5071 const struct nft_set_iter *iter,
5072 struct nft_set_elem *elem)
5074 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5075 const struct nft_data *data;
5077 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5078 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
5081 data = nft_set_ext_data(ext);
5082 switch (data->verdict.code) {
5085 return nf_tables_check_loops(ctx, data->verdict.chain);
5091 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5092 const struct nft_chain *chain)
5094 const struct nft_rule *rule;
5095 const struct nft_expr *expr, *last;
5096 struct nft_set *set;
5097 struct nft_set_binding *binding;
5098 struct nft_set_iter iter;
5100 if (ctx->chain == chain)
5103 list_for_each_entry(rule, &chain->rules, list) {
5104 nft_rule_for_each_expr(expr, last, rule) {
5105 const struct nft_data *data = NULL;
5108 if (!expr->ops->validate)
5111 err = expr->ops->validate(ctx, expr, &data);
5118 switch (data->verdict.code) {
5121 err = nf_tables_check_loops(ctx,
5122 data->verdict.chain);
5131 list_for_each_entry(set, &ctx->table->sets, list) {
5132 if (!nft_is_active_next(ctx->net, set))
5134 if (!(set->flags & NFT_SET_MAP) ||
5135 set->dtype != NFT_DATA_VERDICT)
5138 list_for_each_entry(binding, &set->bindings, list) {
5139 if (!(binding->flags & NFT_SET_MAP) ||
5140 binding->chain != chain)
5143 iter.genmask = nft_genmask_next(ctx->net);
5147 iter.fn = nf_tables_loop_check_setelem;
5149 set->ops->walk(ctx, set, &iter);
5159 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
5161 * @attr: netlink attribute to fetch value from
5162 * @max: maximum value to be stored in dest
5163 * @dest: pointer to the variable
5165 * Parse, check and store a given u32 netlink attribute into variable.
5166 * This function returns -ERANGE if the value goes over maximum value.
5167 * Otherwise a 0 is returned and the attribute value is stored in the
5168 * destination variable.
5170 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
5174 val = ntohl(nla_get_be32(attr));
5181 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
5184 * nft_parse_register - parse a register value from a netlink attribute
5186 * @attr: netlink attribute
5188 * Parse and translate a register value from a netlink attribute.
5189 * Registers used to be 128 bit wide, these register numbers will be
5190 * mapped to the corresponding 32 bit register numbers.
5192 unsigned int nft_parse_register(const struct nlattr *attr)
5196 reg = ntohl(nla_get_be32(attr));
5198 case NFT_REG_VERDICT...NFT_REG_4:
5199 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
5201 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
5204 EXPORT_SYMBOL_GPL(nft_parse_register);
5207 * nft_dump_register - dump a register value to a netlink attribute
5209 * @skb: socket buffer
5210 * @attr: attribute number
5211 * @reg: register number
5213 * Construct a netlink attribute containing the register number. For
5214 * compatibility reasons, register numbers being a multiple of 4 are
5215 * translated to the corresponding 128 bit register numbers.
5217 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
5219 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
5220 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
5222 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
5224 return nla_put_be32(skb, attr, htonl(reg));
5226 EXPORT_SYMBOL_GPL(nft_dump_register);
5229 * nft_validate_register_load - validate a load from a register
5231 * @reg: the register number
5232 * @len: the length of the data
5234 * Validate that the input register is one of the general purpose
5235 * registers and that the length of the load is within the bounds.
5237 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
5239 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5243 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
5248 EXPORT_SYMBOL_GPL(nft_validate_register_load);
5251 * nft_validate_register_store - validate an expressions' register store
5253 * @ctx: context of the expression performing the load
5254 * @reg: the destination register number
5255 * @data: the data to load
5256 * @type: the data type
5257 * @len: the length of the data
5259 * Validate that a data load uses the appropriate data type for
5260 * the destination register and the length is within the bounds.
5261 * A value of NULL for the data means that its runtime gathered
5264 int nft_validate_register_store(const struct nft_ctx *ctx,
5265 enum nft_registers reg,
5266 const struct nft_data *data,
5267 enum nft_data_types type, unsigned int len)
5272 case NFT_REG_VERDICT:
5273 if (type != NFT_DATA_VERDICT)
5277 (data->verdict.code == NFT_GOTO ||
5278 data->verdict.code == NFT_JUMP)) {
5279 err = nf_tables_check_loops(ctx, data->verdict.chain);
5283 if (ctx->chain->level + 1 >
5284 data->verdict.chain->level) {
5285 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
5287 data->verdict.chain->level = ctx->chain->level + 1;
5293 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5297 if (reg * NFT_REG32_SIZE + len >
5298 FIELD_SIZEOF(struct nft_regs, data))
5301 if (data != NULL && type != NFT_DATA_VALUE)
5306 EXPORT_SYMBOL_GPL(nft_validate_register_store);
5308 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
5309 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
5310 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
5311 .len = NFT_CHAIN_MAXNAMELEN - 1 },
5314 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
5315 struct nft_data_desc *desc, const struct nlattr *nla)
5317 u8 genmask = nft_genmask_next(ctx->net);
5318 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
5319 struct nft_chain *chain;
5322 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
5327 if (!tb[NFTA_VERDICT_CODE])
5329 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
5331 switch (data->verdict.code) {
5333 switch (data->verdict.code & NF_VERDICT_MASK) {
5348 if (!tb[NFTA_VERDICT_CHAIN])
5350 chain = nf_tables_chain_lookup(ctx->table,
5351 tb[NFTA_VERDICT_CHAIN], genmask);
5353 return PTR_ERR(chain);
5354 if (nft_is_base_chain(chain))
5358 data->verdict.chain = chain;
5362 desc->len = sizeof(data->verdict);
5363 desc->type = NFT_DATA_VERDICT;
5367 static void nft_verdict_uninit(const struct nft_data *data)
5369 switch (data->verdict.code) {
5372 data->verdict.chain->use--;
5377 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
5379 struct nlattr *nest;
5381 nest = nla_nest_start(skb, type);
5383 goto nla_put_failure;
5385 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
5386 goto nla_put_failure;
5391 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
5393 goto nla_put_failure;
5395 nla_nest_end(skb, nest);
5402 static int nft_value_init(const struct nft_ctx *ctx,
5403 struct nft_data *data, unsigned int size,
5404 struct nft_data_desc *desc, const struct nlattr *nla)
5414 nla_memcpy(data->data, nla, len);
5415 desc->type = NFT_DATA_VALUE;
5420 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
5423 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
5426 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
5427 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
5428 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
5432 * nft_data_init - parse nf_tables data netlink attributes
5434 * @ctx: context of the expression using the data
5435 * @data: destination struct nft_data
5436 * @size: maximum data length
5437 * @desc: data description
5438 * @nla: netlink attribute containing data
5440 * Parse the netlink data attributes and initialize a struct nft_data.
5441 * The type and length of data are returned in the data description.
5443 * The caller can indicate that it only wants to accept data of type
5444 * NFT_DATA_VALUE by passing NULL for the ctx argument.
5446 int nft_data_init(const struct nft_ctx *ctx,
5447 struct nft_data *data, unsigned int size,
5448 struct nft_data_desc *desc, const struct nlattr *nla)
5450 struct nlattr *tb[NFTA_DATA_MAX + 1];
5453 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
5457 if (tb[NFTA_DATA_VALUE])
5458 return nft_value_init(ctx, data, size, desc,
5459 tb[NFTA_DATA_VALUE]);
5460 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
5461 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
5464 EXPORT_SYMBOL_GPL(nft_data_init);
5467 * nft_data_uninit - release a nft_data item
5469 * @data: struct nft_data to release
5470 * @type: type of data
5472 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5473 * all others need to be released by calling this function.
5475 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
5477 if (type < NFT_DATA_VERDICT)
5480 case NFT_DATA_VERDICT:
5481 return nft_verdict_uninit(data);
5486 EXPORT_SYMBOL_GPL(nft_data_uninit);
5488 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
5489 enum nft_data_types type, unsigned int len)
5491 struct nlattr *nest;
5494 nest = nla_nest_start(skb, attr);
5499 case NFT_DATA_VALUE:
5500 err = nft_value_dump(skb, data, len);
5502 case NFT_DATA_VERDICT:
5503 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
5510 nla_nest_end(skb, nest);
5513 EXPORT_SYMBOL_GPL(nft_data_dump);
5515 static int __net_init nf_tables_init_net(struct net *net)
5517 INIT_LIST_HEAD(&net->nft.af_info);
5518 INIT_LIST_HEAD(&net->nft.commit_list);
5519 net->nft.base_seq = 1;
5523 int __nft_release_basechain(struct nft_ctx *ctx)
5525 struct nft_rule *rule, *nr;
5527 BUG_ON(!nft_is_base_chain(ctx->chain));
5529 nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
5531 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
5532 list_del(&rule->list);
5534 nf_tables_rule_destroy(ctx, rule);
5536 list_del(&ctx->chain->list);
5538 nf_tables_chain_destroy(ctx->chain);
5542 EXPORT_SYMBOL_GPL(__nft_release_basechain);
5544 /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
5545 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
5547 struct nft_table *table, *nt;
5548 struct nft_chain *chain, *nc;
5549 struct nft_object *obj, *ne;
5550 struct nft_rule *rule, *nr;
5551 struct nft_set *set, *ns;
5552 struct nft_ctx ctx = {
5557 list_for_each_entry_safe(table, nt, &afi->tables, list) {
5558 list_for_each_entry(chain, &table->chains, list)
5559 nf_tables_unregister_hooks(net, table, chain,
5561 /* No packets are walking on these chains anymore. */
5563 list_for_each_entry(chain, &table->chains, list) {
5565 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
5566 list_del(&rule->list);
5568 nf_tables_rule_destroy(&ctx, rule);
5571 list_for_each_entry_safe(set, ns, &table->sets, list) {
5572 list_del(&set->list);
5574 nft_set_destroy(set);
5576 list_for_each_entry_safe(obj, ne, &table->objects, list) {
5577 list_del(&obj->list);
5579 nft_obj_destroy(obj);
5581 list_for_each_entry_safe(chain, nc, &table->chains, list) {
5582 list_del(&chain->list);
5584 nf_tables_chain_destroy(chain);
5586 list_del(&table->list);
5587 nf_tables_table_destroy(&ctx);
5591 static struct pernet_operations nf_tables_net_ops = {
5592 .init = nf_tables_init_net,
5595 static int __init nf_tables_module_init(void)
5599 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
5606 err = nf_tables_core_module_init();
5610 err = nfnetlink_subsys_register(&nf_tables_subsys);
5614 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
5615 return register_pernet_subsys(&nf_tables_net_ops);
5617 nf_tables_core_module_exit();
5624 static void __exit nf_tables_module_exit(void)
5626 unregister_pernet_subsys(&nf_tables_net_ops);
5627 nfnetlink_subsys_unregister(&nf_tables_subsys);
5629 nf_tables_core_module_exit();
5633 module_init(nf_tables_module_init);
5634 module_exit(nf_tables_module_exit);
5636 MODULE_LICENSE("GPL");
5637 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
5638 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);