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/vmalloc.h>
17 #include <linux/netfilter.h>
18 #include <linux/netfilter/nfnetlink.h>
19 #include <linux/netfilter/nf_tables.h>
20 #include <net/netfilter/nf_tables_core.h>
21 #include <net/netfilter/nf_tables.h>
22 #include <net/net_namespace.h>
25 static LIST_HEAD(nf_tables_expressions);
26 static LIST_HEAD(nf_tables_objects);
29 * nft_register_afinfo - register nf_tables address family info
31 * @afi: address family info to register
33 * Register the address family for use with nf_tables. Returns zero on
34 * success or a negative errno code otherwise.
36 int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
38 INIT_LIST_HEAD(&afi->tables);
39 nfnl_lock(NFNL_SUBSYS_NFTABLES);
40 list_add_tail_rcu(&afi->list, &net->nft.af_info);
41 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
44 EXPORT_SYMBOL_GPL(nft_register_afinfo);
46 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi);
49 * nft_unregister_afinfo - unregister nf_tables address family info
51 * @afi: address family info to unregister
53 * Unregister the address family for use with nf_tables.
55 void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi)
57 nfnl_lock(NFNL_SUBSYS_NFTABLES);
58 __nft_release_afinfo(net, afi);
59 list_del_rcu(&afi->list);
60 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
62 EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
64 static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
66 struct nft_af_info *afi;
68 list_for_each_entry(afi, &net->nft.af_info, list) {
69 if (afi->family == family)
75 static struct nft_af_info *
76 nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
78 struct nft_af_info *afi;
80 afi = nft_afinfo_lookup(net, family);
85 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
86 request_module("nft-afinfo-%u", family);
87 nfnl_lock(NFNL_SUBSYS_NFTABLES);
88 afi = nft_afinfo_lookup(net, family);
90 return ERR_PTR(-EAGAIN);
93 return ERR_PTR(-EAFNOSUPPORT);
96 static void nft_ctx_init(struct nft_ctx *ctx,
98 const struct sk_buff *skb,
99 const struct nlmsghdr *nlh,
100 struct nft_af_info *afi,
101 struct nft_table *table,
102 struct nft_chain *chain,
103 const struct nlattr * const *nla)
110 ctx->portid = NETLINK_CB(skb).portid;
111 ctx->report = nlmsg_report(nlh);
112 ctx->seq = nlh->nlmsg_seq;
115 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
116 int msg_type, u32 size, gfp_t gfp)
118 struct nft_trans *trans;
120 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
124 trans->msg_type = msg_type;
130 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
131 int msg_type, u32 size)
133 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
136 static void nft_trans_destroy(struct nft_trans *trans)
138 list_del(&trans->list);
142 static int nf_tables_register_hooks(struct net *net,
143 const struct nft_table *table,
144 struct nft_chain *chain,
145 unsigned int hook_nops)
147 if (table->flags & NFT_TABLE_F_DORMANT ||
148 !nft_is_base_chain(chain))
151 return nf_register_net_hooks(net, nft_base_chain(chain)->ops,
155 static void nf_tables_unregister_hooks(struct net *net,
156 const struct nft_table *table,
157 struct nft_chain *chain,
158 unsigned int hook_nops)
160 if (table->flags & NFT_TABLE_F_DORMANT ||
161 !nft_is_base_chain(chain))
164 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops, hook_nops);
167 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
169 struct nft_trans *trans;
171 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
175 if (msg_type == NFT_MSG_NEWTABLE)
176 nft_activate_next(ctx->net, ctx->table);
178 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
182 static int nft_deltable(struct nft_ctx *ctx)
186 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
190 nft_deactivate_next(ctx->net, ctx->table);
194 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
196 struct nft_trans *trans;
198 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
202 if (msg_type == NFT_MSG_NEWCHAIN)
203 nft_activate_next(ctx->net, ctx->chain);
205 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
209 static int nft_delchain(struct nft_ctx *ctx)
213 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
218 nft_deactivate_next(ctx->net, ctx->chain);
223 /* either expr ops provide both activate/deactivate, or neither */
224 static bool nft_expr_check_ops(const struct nft_expr_ops *ops)
229 if (WARN_ON_ONCE((!ops->activate ^ !ops->deactivate)))
235 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
236 struct nft_rule *rule)
238 struct nft_expr *expr;
240 expr = nft_expr_first(rule);
241 while (expr != nft_expr_last(rule) && expr->ops) {
242 if (expr->ops->activate)
243 expr->ops->activate(ctx, expr);
245 expr = nft_expr_next(expr);
249 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
250 struct nft_rule *rule)
252 struct nft_expr *expr;
254 expr = nft_expr_first(rule);
255 while (expr != nft_expr_last(rule) && expr->ops) {
256 if (expr->ops->deactivate)
257 expr->ops->deactivate(ctx, expr);
259 expr = nft_expr_next(expr);
264 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
266 /* You cannot delete the same rule twice */
267 if (nft_is_active_next(ctx->net, rule)) {
268 nft_deactivate_next(ctx->net, rule);
275 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
276 struct nft_rule *rule)
278 struct nft_trans *trans;
280 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
284 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
285 nft_trans_rule_id(trans) =
286 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
288 nft_trans_rule(trans) = rule;
289 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
294 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
296 struct nft_trans *trans;
299 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
303 err = nf_tables_delrule_deactivate(ctx, rule);
305 nft_trans_destroy(trans);
308 nft_rule_expr_deactivate(ctx, rule);
313 static int nft_delrule_by_chain(struct nft_ctx *ctx)
315 struct nft_rule *rule;
318 list_for_each_entry(rule, &ctx->chain->rules, list) {
319 if (!nft_is_active_next(ctx->net, rule))
322 err = nft_delrule(ctx, rule);
329 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
332 struct nft_trans *trans;
334 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
338 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
339 nft_trans_set_id(trans) =
340 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
341 nft_activate_next(ctx->net, set);
343 nft_trans_set(trans) = set;
344 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
349 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
353 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
357 nft_deactivate_next(ctx->net, set);
363 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
364 struct nft_object *obj)
366 struct nft_trans *trans;
368 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
372 if (msg_type == NFT_MSG_NEWOBJ)
373 nft_activate_next(ctx->net, obj);
375 nft_trans_obj(trans) = obj;
376 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
381 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
385 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
389 nft_deactivate_next(ctx->net, obj);
399 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
400 const struct nlattr *nla,
403 struct nft_table *table;
405 list_for_each_entry(table, &afi->tables, list) {
406 if (!nla_strcmp(nla, table->name) &&
407 nft_active_genmask(table, genmask))
413 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
414 const struct nlattr *nla,
417 struct nft_table *table;
420 return ERR_PTR(-EINVAL);
422 table = nft_table_lookup(afi, nla, genmask);
426 return ERR_PTR(-ENOENT);
429 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
431 return ++table->hgenerator;
434 static const struct nf_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
436 static const struct nf_chain_type *
437 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
441 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
442 if (chain_type[family][i] != NULL &&
443 !nla_strcmp(nla, chain_type[family][i]->name))
444 return chain_type[family][i];
449 static const struct nf_chain_type *
450 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
451 const struct nlattr *nla,
454 const struct nf_chain_type *type;
456 type = __nf_tables_chain_type_lookup(afi->family, nla);
459 #ifdef CONFIG_MODULES
461 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
462 request_module("nft-chain-%u-%.*s", afi->family,
463 nla_len(nla), (const char *)nla_data(nla));
464 nfnl_lock(NFNL_SUBSYS_NFTABLES);
465 type = __nf_tables_chain_type_lookup(afi->family, nla);
467 return ERR_PTR(-EAGAIN);
470 return ERR_PTR(-ENOENT);
473 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
474 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
475 .len = NFT_TABLE_MAXNAMELEN - 1 },
476 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
479 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
480 u32 portid, u32 seq, int event, u32 flags,
481 int family, const struct nft_table *table)
483 struct nlmsghdr *nlh;
484 struct nfgenmsg *nfmsg;
486 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
487 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
489 goto nla_put_failure;
491 nfmsg = nlmsg_data(nlh);
492 nfmsg->nfgen_family = family;
493 nfmsg->version = NFNETLINK_V0;
494 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
496 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
497 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
498 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
499 goto nla_put_failure;
505 nlmsg_trim(skb, nlh);
509 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
515 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
518 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
522 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
523 event, 0, ctx->afi->family, ctx->table);
529 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
530 ctx->report, GFP_KERNEL);
533 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
536 static int nf_tables_dump_tables(struct sk_buff *skb,
537 struct netlink_callback *cb)
539 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
540 const struct nft_af_info *afi;
541 const struct nft_table *table;
542 unsigned int idx = 0, s_idx = cb->args[0];
543 struct net *net = sock_net(skb->sk);
544 int family = nfmsg->nfgen_family;
547 cb->seq = net->nft.base_seq;
549 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
550 if (family != NFPROTO_UNSPEC && family != afi->family)
553 list_for_each_entry_rcu(table, &afi->tables, list) {
557 memset(&cb->args[1], 0,
558 sizeof(cb->args) - sizeof(cb->args[0]));
559 if (!nft_is_active(net, table))
561 if (nf_tables_fill_table_info(skb, net,
562 NETLINK_CB(cb->skb).portid,
566 afi->family, table) < 0)
569 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
580 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
581 struct sk_buff *skb, const struct nlmsghdr *nlh,
582 const struct nlattr * const nla[],
583 struct netlink_ext_ack *extack)
585 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
586 u8 genmask = nft_genmask_cur(net);
587 const struct nft_af_info *afi;
588 const struct nft_table *table;
589 struct sk_buff *skb2;
590 int family = nfmsg->nfgen_family;
593 if (nlh->nlmsg_flags & NLM_F_DUMP) {
594 struct netlink_dump_control c = {
595 .dump = nf_tables_dump_tables,
597 return netlink_dump_start(nlsk, skb, nlh, &c);
600 afi = nf_tables_afinfo_lookup(net, family, false);
604 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
606 return PTR_ERR(table);
608 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
612 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
613 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
618 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
625 static void _nf_tables_table_disable(struct net *net,
626 const struct nft_af_info *afi,
627 struct nft_table *table,
630 struct nft_chain *chain;
633 list_for_each_entry(chain, &table->chains, list) {
634 if (!nft_is_active_next(net, chain))
636 if (!nft_is_base_chain(chain))
639 if (cnt && i++ == cnt)
642 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
647 static int nf_tables_table_enable(struct net *net,
648 const struct nft_af_info *afi,
649 struct nft_table *table)
651 struct nft_chain *chain;
654 list_for_each_entry(chain, &table->chains, list) {
655 if (!nft_is_active_next(net, chain))
657 if (!nft_is_base_chain(chain))
660 err = nf_register_net_hooks(net, nft_base_chain(chain)->ops,
670 _nf_tables_table_disable(net, afi, table, i);
674 static void nf_tables_table_disable(struct net *net,
675 const struct nft_af_info *afi,
676 struct nft_table *table)
678 _nf_tables_table_disable(net, afi, table, 0);
681 static int nf_tables_updtable(struct nft_ctx *ctx)
683 struct nft_trans *trans;
687 if (!ctx->nla[NFTA_TABLE_FLAGS])
690 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
691 if (flags & ~NFT_TABLE_F_DORMANT)
694 if (flags == ctx->table->flags)
697 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
698 sizeof(struct nft_trans_table));
702 if ((flags & NFT_TABLE_F_DORMANT) &&
703 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
704 nft_trans_table_enable(trans) = false;
705 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
706 ctx->table->flags & NFT_TABLE_F_DORMANT) {
707 ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table);
709 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
710 nft_trans_table_enable(trans) = true;
716 nft_trans_table_update(trans) = true;
717 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
720 nft_trans_destroy(trans);
724 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
725 struct sk_buff *skb, const struct nlmsghdr *nlh,
726 const struct nlattr * const nla[],
727 struct netlink_ext_ack *extack)
729 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
730 u8 genmask = nft_genmask_next(net);
731 const struct nlattr *name;
732 struct nft_af_info *afi;
733 struct nft_table *table;
734 int family = nfmsg->nfgen_family;
739 afi = nf_tables_afinfo_lookup(net, family, true);
743 name = nla[NFTA_TABLE_NAME];
744 table = nf_tables_table_lookup(afi, name, genmask);
746 if (PTR_ERR(table) != -ENOENT)
747 return PTR_ERR(table);
749 if (nlh->nlmsg_flags & NLM_F_EXCL)
751 if (nlh->nlmsg_flags & NLM_F_REPLACE)
754 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
755 return nf_tables_updtable(&ctx);
758 if (nla[NFTA_TABLE_FLAGS]) {
759 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
760 if (flags & ~NFT_TABLE_F_DORMANT)
765 if (!try_module_get(afi->owner))
769 table = kzalloc(sizeof(*table), GFP_KERNEL);
773 table->name = nla_strdup(name, GFP_KERNEL);
774 if (table->name == NULL)
777 INIT_LIST_HEAD(&table->chains);
778 INIT_LIST_HEAD(&table->sets);
779 INIT_LIST_HEAD(&table->objects);
780 table->flags = flags;
782 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
783 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
787 list_add_tail_rcu(&table->list, &afi->tables);
794 module_put(afi->owner);
799 static int nft_flush_table(struct nft_ctx *ctx)
802 struct nft_chain *chain, *nc;
803 struct nft_object *obj, *ne;
804 struct nft_set *set, *ns;
806 list_for_each_entry(chain, &ctx->table->chains, list) {
807 if (!nft_is_active_next(ctx->net, chain))
812 err = nft_delrule_by_chain(ctx);
817 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
818 if (!nft_is_active_next(ctx->net, set))
821 if (set->flags & NFT_SET_ANONYMOUS &&
822 !list_empty(&set->bindings))
825 err = nft_delset(ctx, set);
830 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
831 err = nft_delobj(ctx, obj);
836 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
837 if (!nft_is_active_next(ctx->net, chain))
842 err = nft_delchain(ctx);
847 err = nft_deltable(ctx);
852 static int nft_flush(struct nft_ctx *ctx, int family)
854 struct nft_af_info *afi;
855 struct nft_table *table, *nt;
856 const struct nlattr * const *nla = ctx->nla;
859 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
860 if (family != AF_UNSPEC && afi->family != family)
864 list_for_each_entry_safe(table, nt, &afi->tables, list) {
865 if (!nft_is_active_next(ctx->net, table))
868 if (nla[NFTA_TABLE_NAME] &&
869 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
874 err = nft_flush_table(ctx);
883 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
884 struct sk_buff *skb, const struct nlmsghdr *nlh,
885 const struct nlattr * const nla[],
886 struct netlink_ext_ack *extack)
888 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
889 u8 genmask = nft_genmask_next(net);
890 struct nft_af_info *afi;
891 struct nft_table *table;
892 int family = nfmsg->nfgen_family;
895 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
896 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
897 return nft_flush(&ctx, family);
899 afi = nf_tables_afinfo_lookup(net, family, false);
903 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
905 return PTR_ERR(table);
907 if (nlh->nlmsg_flags & NLM_F_NONREC &&
914 return nft_flush_table(&ctx);
917 static void nf_tables_table_destroy(struct nft_ctx *ctx)
919 BUG_ON(ctx->table->use > 0);
921 kfree(ctx->table->name);
923 module_put(ctx->afi->owner);
926 int nft_register_chain_type(const struct nf_chain_type *ctype)
930 if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO))
933 nfnl_lock(NFNL_SUBSYS_NFTABLES);
934 if (chain_type[ctype->family][ctype->type] != NULL) {
938 chain_type[ctype->family][ctype->type] = ctype;
940 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
943 EXPORT_SYMBOL_GPL(nft_register_chain_type);
945 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
947 nfnl_lock(NFNL_SUBSYS_NFTABLES);
948 chain_type[ctype->family][ctype->type] = NULL;
949 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
951 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
957 static struct nft_chain *
958 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle,
961 struct nft_chain *chain;
963 list_for_each_entry(chain, &table->chains, list) {
964 if (chain->handle == handle &&
965 nft_active_genmask(chain, genmask))
969 return ERR_PTR(-ENOENT);
972 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
973 const struct nlattr *nla,
976 struct nft_chain *chain;
979 return ERR_PTR(-EINVAL);
981 list_for_each_entry(chain, &table->chains, list) {
982 if (!nla_strcmp(nla, chain->name) &&
983 nft_active_genmask(chain, genmask))
987 return ERR_PTR(-ENOENT);
990 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
991 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
992 .len = NFT_TABLE_MAXNAMELEN - 1 },
993 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
994 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
995 .len = NFT_CHAIN_MAXNAMELEN - 1 },
996 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
997 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
998 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
999 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1002 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1003 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1004 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1005 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1006 .len = IFNAMSIZ - 1 },
1009 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1011 struct nft_stats *cpu_stats, total;
1012 struct nlattr *nest;
1017 memset(&total, 0, sizeof(total));
1018 for_each_possible_cpu(cpu) {
1019 cpu_stats = per_cpu_ptr(stats, cpu);
1021 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1022 pkts = cpu_stats->pkts;
1023 bytes = cpu_stats->bytes;
1024 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1026 total.bytes += bytes;
1028 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
1030 goto nla_put_failure;
1032 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1033 NFTA_COUNTER_PAD) ||
1034 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1036 goto nla_put_failure;
1038 nla_nest_end(skb, nest);
1045 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1046 u32 portid, u32 seq, int event, u32 flags,
1047 int family, const struct nft_table *table,
1048 const struct nft_chain *chain)
1050 struct nlmsghdr *nlh;
1051 struct nfgenmsg *nfmsg;
1053 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1054 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1056 goto nla_put_failure;
1058 nfmsg = nlmsg_data(nlh);
1059 nfmsg->nfgen_family = family;
1060 nfmsg->version = NFNETLINK_V0;
1061 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1063 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1064 goto nla_put_failure;
1065 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1067 goto nla_put_failure;
1068 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1069 goto nla_put_failure;
1071 if (nft_is_base_chain(chain)) {
1072 const struct nft_base_chain *basechain = nft_base_chain(chain);
1073 const struct nf_hook_ops *ops = &basechain->ops[0];
1074 struct nlattr *nest;
1076 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
1078 goto nla_put_failure;
1079 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1080 goto nla_put_failure;
1081 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1082 goto nla_put_failure;
1083 if (basechain->dev_name[0] &&
1084 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1085 goto nla_put_failure;
1086 nla_nest_end(skb, nest);
1088 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1089 htonl(basechain->policy)))
1090 goto nla_put_failure;
1092 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1093 goto nla_put_failure;
1095 if (basechain->stats && nft_dump_stats(skb, basechain->stats))
1096 goto nla_put_failure;
1099 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1100 goto nla_put_failure;
1102 nlmsg_end(skb, nlh);
1106 nlmsg_trim(skb, nlh);
1110 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1112 struct sk_buff *skb;
1116 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1119 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1123 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1124 event, 0, ctx->afi->family, ctx->table,
1131 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1132 ctx->report, GFP_KERNEL);
1135 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1138 static int nf_tables_dump_chains(struct sk_buff *skb,
1139 struct netlink_callback *cb)
1141 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1142 const struct nft_af_info *afi;
1143 const struct nft_table *table;
1144 const struct nft_chain *chain;
1145 unsigned int idx = 0, s_idx = cb->args[0];
1146 struct net *net = sock_net(skb->sk);
1147 int family = nfmsg->nfgen_family;
1150 cb->seq = net->nft.base_seq;
1152 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1153 if (family != NFPROTO_UNSPEC && family != afi->family)
1156 list_for_each_entry_rcu(table, &afi->tables, list) {
1157 list_for_each_entry_rcu(chain, &table->chains, list) {
1161 memset(&cb->args[1], 0,
1162 sizeof(cb->args) - sizeof(cb->args[0]));
1163 if (!nft_is_active(net, chain))
1165 if (nf_tables_fill_chain_info(skb, net,
1166 NETLINK_CB(cb->skb).portid,
1170 afi->family, table, chain) < 0)
1173 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1185 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1186 struct sk_buff *skb, const struct nlmsghdr *nlh,
1187 const struct nlattr * const nla[],
1188 struct netlink_ext_ack *extack)
1190 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1191 u8 genmask = nft_genmask_cur(net);
1192 const struct nft_af_info *afi;
1193 const struct nft_table *table;
1194 const struct nft_chain *chain;
1195 struct sk_buff *skb2;
1196 int family = nfmsg->nfgen_family;
1199 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1200 struct netlink_dump_control c = {
1201 .dump = nf_tables_dump_chains,
1203 return netlink_dump_start(nlsk, skb, nlh, &c);
1206 afi = nf_tables_afinfo_lookup(net, family, false);
1208 return PTR_ERR(afi);
1210 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1212 return PTR_ERR(table);
1214 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1216 return PTR_ERR(chain);
1218 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1222 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1223 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1224 family, table, chain);
1228 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1235 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1236 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1237 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1240 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1242 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1243 struct nft_stats __percpu *newstats;
1244 struct nft_stats *stats;
1247 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy,
1250 return ERR_PTR(err);
1252 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1253 return ERR_PTR(-EINVAL);
1255 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1256 if (newstats == NULL)
1257 return ERR_PTR(-ENOMEM);
1259 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1260 * are not exposed to userspace.
1263 stats = this_cpu_ptr(newstats);
1264 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1265 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1271 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1272 struct nft_stats __percpu *newstats)
1274 if (newstats == NULL)
1278 struct nft_stats __percpu *oldstats =
1279 nft_dereference(chain->stats);
1281 rcu_assign_pointer(chain->stats, newstats);
1283 free_percpu(oldstats);
1285 rcu_assign_pointer(chain->stats, newstats);
1286 static_branch_inc(&nft_counters_enabled);
1290 static void nf_tables_chain_destroy(struct nft_chain *chain)
1292 BUG_ON(chain->use > 0);
1294 if (nft_is_base_chain(chain)) {
1295 struct nft_base_chain *basechain = nft_base_chain(chain);
1297 module_put(basechain->type->owner);
1298 free_percpu(basechain->stats);
1299 if (basechain->stats)
1300 static_branch_dec(&nft_counters_enabled);
1301 if (basechain->ops[0].dev != NULL)
1302 dev_put(basechain->ops[0].dev);
1311 struct nft_chain_hook {
1314 const struct nf_chain_type *type;
1315 struct net_device *dev;
1318 static int nft_chain_parse_hook(struct net *net,
1319 const struct nlattr * const nla[],
1320 struct nft_af_info *afi,
1321 struct nft_chain_hook *hook, bool create)
1323 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1324 const struct nf_chain_type *type;
1325 struct net_device *dev;
1328 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1329 nft_hook_policy, NULL);
1333 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1334 ha[NFTA_HOOK_PRIORITY] == NULL)
1337 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1338 if (hook->num >= afi->nhooks)
1341 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1343 type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT];
1344 if (nla[NFTA_CHAIN_TYPE]) {
1345 type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE],
1348 return PTR_ERR(type);
1350 if (!(type->hook_mask & (1 << hook->num)))
1352 if (!try_module_get(type->owner))
1358 if (afi->flags & NFT_AF_NEEDS_DEV) {
1359 char ifname[IFNAMSIZ];
1361 if (!ha[NFTA_HOOK_DEV]) {
1362 module_put(type->owner);
1366 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1367 dev = dev_get_by_name(net, ifname);
1369 module_put(type->owner);
1373 } else if (ha[NFTA_HOOK_DEV]) {
1374 module_put(type->owner);
1381 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1383 module_put(hook->type->owner);
1384 if (hook->dev != NULL)
1388 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1389 u8 policy, bool create)
1391 const struct nlattr * const *nla = ctx->nla;
1392 struct nft_table *table = ctx->table;
1393 struct nft_af_info *afi = ctx->afi;
1394 struct nft_base_chain *basechain;
1395 struct nft_stats __percpu *stats;
1396 struct net *net = ctx->net;
1397 struct nft_chain *chain;
1401 if (table->use == UINT_MAX)
1404 if (nla[NFTA_CHAIN_HOOK]) {
1405 struct nft_chain_hook hook;
1406 struct nf_hook_ops *ops;
1409 err = nft_chain_parse_hook(net, nla, afi, &hook, create);
1413 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1414 if (basechain == NULL) {
1415 nft_chain_release_hook(&hook);
1419 if (hook.dev != NULL)
1420 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1422 if (nla[NFTA_CHAIN_COUNTERS]) {
1423 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1424 if (IS_ERR(stats)) {
1425 nft_chain_release_hook(&hook);
1427 return PTR_ERR(stats);
1429 basechain->stats = stats;
1430 static_branch_inc(&nft_counters_enabled);
1433 hookfn = hook.type->hooks[hook.num];
1434 basechain->type = hook.type;
1435 chain = &basechain->chain;
1437 for (i = 0; i < afi->nops; i++) {
1438 ops = &basechain->ops[i];
1440 ops->hooknum = hook.num;
1441 ops->priority = hook.priority;
1443 ops->hook = afi->hooks[ops->hooknum];
1444 ops->dev = hook.dev;
1447 if (afi->hook_ops_init)
1448 afi->hook_ops_init(ops, i);
1451 chain->flags |= NFT_BASE_CHAIN;
1452 basechain->policy = policy;
1454 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1458 INIT_LIST_HEAD(&chain->rules);
1459 chain->handle = nf_tables_alloc_handle(table);
1460 chain->table = table;
1461 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1467 err = nf_tables_register_hooks(net, table, chain, afi->nops);
1472 err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1477 list_add_tail_rcu(&chain->list, &table->chains);
1481 nf_tables_unregister_hooks(net, table, chain, afi->nops);
1483 nf_tables_chain_destroy(chain);
1488 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
1491 const struct nlattr * const *nla = ctx->nla;
1492 struct nft_table *table = ctx->table;
1493 struct nft_chain *chain = ctx->chain;
1494 struct nft_af_info *afi = ctx->afi;
1495 struct nft_base_chain *basechain;
1496 struct nft_stats *stats = NULL;
1497 struct nft_chain_hook hook;
1498 struct nf_hook_ops *ops;
1499 struct nft_trans *trans;
1502 if (nla[NFTA_CHAIN_HOOK]) {
1503 if (!nft_is_base_chain(chain))
1506 err = nft_chain_parse_hook(ctx->net, nla, ctx->afi, &hook,
1511 basechain = nft_base_chain(chain);
1512 if (basechain->type != hook.type) {
1513 nft_chain_release_hook(&hook);
1517 for (i = 0; i < afi->nops; i++) {
1518 ops = &basechain->ops[i];
1519 if (ops->hooknum != hook.num ||
1520 ops->priority != hook.priority ||
1521 ops->dev != hook.dev) {
1522 nft_chain_release_hook(&hook);
1526 nft_chain_release_hook(&hook);
1529 if (nla[NFTA_CHAIN_HANDLE] &&
1530 nla[NFTA_CHAIN_NAME]) {
1531 struct nft_chain *chain2;
1533 chain2 = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME],
1535 if (!IS_ERR(chain2))
1539 if (nla[NFTA_CHAIN_COUNTERS]) {
1540 if (!nft_is_base_chain(chain))
1543 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1545 return PTR_ERR(stats);
1549 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
1550 sizeof(struct nft_trans_chain));
1554 nft_trans_chain_stats(trans) = stats;
1555 nft_trans_chain_update(trans) = true;
1557 if (nla[NFTA_CHAIN_POLICY])
1558 nft_trans_chain_policy(trans) = policy;
1560 nft_trans_chain_policy(trans) = -1;
1562 if (nla[NFTA_CHAIN_HANDLE] &&
1563 nla[NFTA_CHAIN_NAME]) {
1564 struct nft_trans *tmp;
1568 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1573 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
1574 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
1575 tmp->ctx.table == table &&
1576 nft_trans_chain_update(tmp) &&
1577 nft_trans_chain_name(tmp) &&
1578 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
1584 nft_trans_chain_name(trans) = name;
1586 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1595 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1596 struct sk_buff *skb, const struct nlmsghdr *nlh,
1597 const struct nlattr * const nla[],
1598 struct netlink_ext_ack *extack)
1600 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1601 const struct nlattr * uninitialized_var(name);
1602 u8 genmask = nft_genmask_next(net);
1603 int family = nfmsg->nfgen_family;
1604 struct nft_af_info *afi;
1605 struct nft_table *table;
1606 struct nft_chain *chain;
1607 u8 policy = NF_ACCEPT;
1612 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1614 afi = nf_tables_afinfo_lookup(net, family, true);
1616 return PTR_ERR(afi);
1618 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1620 return PTR_ERR(table);
1623 name = nla[NFTA_CHAIN_NAME];
1625 if (nla[NFTA_CHAIN_HANDLE]) {
1626 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1627 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
1629 return PTR_ERR(chain);
1631 chain = nf_tables_chain_lookup(table, name, genmask);
1632 if (IS_ERR(chain)) {
1633 if (PTR_ERR(chain) != -ENOENT)
1634 return PTR_ERR(chain);
1639 if (nla[NFTA_CHAIN_POLICY]) {
1640 if (chain != NULL &&
1641 !nft_is_base_chain(chain))
1644 if (chain == NULL &&
1645 nla[NFTA_CHAIN_HOOK] == NULL)
1648 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1658 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1660 if (chain != NULL) {
1661 if (nlh->nlmsg_flags & NLM_F_EXCL)
1663 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1666 return nf_tables_updchain(&ctx, genmask, policy, create);
1669 return nf_tables_addchain(&ctx, family, genmask, policy, create);
1672 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1673 struct sk_buff *skb, const struct nlmsghdr *nlh,
1674 const struct nlattr * const nla[],
1675 struct netlink_ext_ack *extack)
1677 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1678 u8 genmask = nft_genmask_next(net);
1679 struct nft_af_info *afi;
1680 struct nft_table *table;
1681 struct nft_chain *chain;
1682 struct nft_rule *rule;
1683 int family = nfmsg->nfgen_family;
1688 afi = nf_tables_afinfo_lookup(net, family, false);
1690 return PTR_ERR(afi);
1692 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1694 return PTR_ERR(table);
1696 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1698 return PTR_ERR(chain);
1700 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1704 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1707 list_for_each_entry(rule, &chain->rules, list) {
1708 if (!nft_is_active_next(net, rule))
1712 err = nft_delrule(&ctx, rule);
1717 /* There are rules and elements that are still holding references to us,
1718 * we cannot do a recursive removal in this case.
1723 return nft_delchain(&ctx);
1731 * nft_register_expr - register nf_tables expr type
1734 * Registers the expr type for use with nf_tables. Returns zero on
1735 * success or a negative errno code otherwise.
1737 int nft_register_expr(struct nft_expr_type *type)
1739 if (!nft_expr_check_ops(type->ops))
1742 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1743 if (type->family == NFPROTO_UNSPEC)
1744 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1746 list_add_rcu(&type->list, &nf_tables_expressions);
1747 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1750 EXPORT_SYMBOL_GPL(nft_register_expr);
1753 * nft_unregister_expr - unregister nf_tables expr type
1756 * Unregisters the expr typefor use with nf_tables.
1758 void nft_unregister_expr(struct nft_expr_type *type)
1760 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1761 list_del_rcu(&type->list);
1762 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1764 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1766 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1769 const struct nft_expr_type *type;
1771 list_for_each_entry(type, &nf_tables_expressions, list) {
1772 if (!nla_strcmp(nla, type->name) &&
1773 (!type->family || type->family == family))
1779 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1782 const struct nft_expr_type *type;
1785 return ERR_PTR(-EINVAL);
1787 type = __nft_expr_type_get(family, nla);
1788 if (type != NULL && try_module_get(type->owner))
1791 #ifdef CONFIG_MODULES
1793 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1794 request_module("nft-expr-%u-%.*s", family,
1795 nla_len(nla), (char *)nla_data(nla));
1796 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1797 if (__nft_expr_type_get(family, nla))
1798 return ERR_PTR(-EAGAIN);
1800 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1801 request_module("nft-expr-%.*s",
1802 nla_len(nla), (char *)nla_data(nla));
1803 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1804 if (__nft_expr_type_get(family, nla))
1805 return ERR_PTR(-EAGAIN);
1808 return ERR_PTR(-ENOENT);
1811 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1812 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1813 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1816 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1817 const struct nft_expr *expr)
1819 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1820 goto nla_put_failure;
1822 if (expr->ops->dump) {
1823 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1825 goto nla_put_failure;
1826 if (expr->ops->dump(skb, expr) < 0)
1827 goto nla_put_failure;
1828 nla_nest_end(skb, data);
1837 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1838 const struct nft_expr *expr)
1840 struct nlattr *nest;
1842 nest = nla_nest_start(skb, attr);
1844 goto nla_put_failure;
1845 if (nf_tables_fill_expr_info(skb, expr) < 0)
1846 goto nla_put_failure;
1847 nla_nest_end(skb, nest);
1854 struct nft_expr_info {
1855 const struct nft_expr_ops *ops;
1856 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1859 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1860 const struct nlattr *nla,
1861 struct nft_expr_info *info)
1863 const struct nft_expr_type *type;
1864 const struct nft_expr_ops *ops;
1865 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1868 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL);
1872 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1874 return PTR_ERR(type);
1876 if (tb[NFTA_EXPR_DATA]) {
1877 err = nla_parse_nested(info->tb, type->maxattr,
1878 tb[NFTA_EXPR_DATA], type->policy, NULL);
1882 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1884 if (type->select_ops != NULL) {
1885 ops = type->select_ops(ctx,
1886 (const struct nlattr * const *)info->tb);
1891 if (!nft_expr_check_ops(ops)) {
1902 module_put(type->owner);
1906 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1907 const struct nft_expr_info *info,
1908 struct nft_expr *expr)
1910 const struct nft_expr_ops *ops = info->ops;
1915 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1920 if (ops->validate) {
1921 const struct nft_data *data = NULL;
1923 err = ops->validate(ctx, expr, &data);
1932 ops->destroy(ctx, expr);
1938 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1939 struct nft_expr *expr)
1941 if (expr->ops->destroy)
1942 expr->ops->destroy(ctx, expr);
1943 module_put(expr->ops->type->owner);
1946 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1947 const struct nlattr *nla)
1949 struct nft_expr_info info;
1950 struct nft_expr *expr;
1953 err = nf_tables_expr_parse(ctx, nla, &info);
1955 goto err_expr_parse;
1958 if (!(info.ops->type->flags & NFT_EXPR_STATEFUL))
1959 goto err_expr_stateful;
1962 expr = kzalloc(info.ops->size, GFP_KERNEL);
1964 goto err_expr_stateful;
1966 err = nf_tables_newexpr(ctx, &info, expr);
1974 module_put(info.ops->type->owner);
1976 return ERR_PTR(err);
1979 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1981 nf_tables_expr_destroy(ctx, expr);
1989 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1992 struct nft_rule *rule;
1994 // FIXME: this sucks
1995 list_for_each_entry(rule, &chain->rules, list) {
1996 if (handle == rule->handle)
2000 return ERR_PTR(-ENOENT);
2003 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
2004 const struct nlattr *nla)
2007 return ERR_PTR(-EINVAL);
2009 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2012 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2013 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2014 .len = NFT_TABLE_MAXNAMELEN - 1 },
2015 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2016 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2017 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2018 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2019 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2020 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2021 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2022 .len = NFT_USERDATA_MAXLEN },
2023 [NFTA_RULE_ID] = { .type = NLA_U32 },
2026 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2027 u32 portid, u32 seq, int event,
2028 u32 flags, int family,
2029 const struct nft_table *table,
2030 const struct nft_chain *chain,
2031 const struct nft_rule *rule)
2033 struct nlmsghdr *nlh;
2034 struct nfgenmsg *nfmsg;
2035 const struct nft_expr *expr, *next;
2036 struct nlattr *list;
2037 const struct nft_rule *prule;
2038 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2040 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2042 goto nla_put_failure;
2044 nfmsg = nlmsg_data(nlh);
2045 nfmsg->nfgen_family = family;
2046 nfmsg->version = NFNETLINK_V0;
2047 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
2049 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2050 goto nla_put_failure;
2051 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2052 goto nla_put_failure;
2053 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2055 goto nla_put_failure;
2057 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
2058 prule = list_prev_entry(rule, list);
2059 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2060 cpu_to_be64(prule->handle),
2062 goto nla_put_failure;
2065 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
2067 goto nla_put_failure;
2068 nft_rule_for_each_expr(expr, next, rule) {
2069 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2070 goto nla_put_failure;
2072 nla_nest_end(skb, list);
2075 struct nft_userdata *udata = nft_userdata(rule);
2076 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2078 goto nla_put_failure;
2081 nlmsg_end(skb, nlh);
2085 nlmsg_trim(skb, nlh);
2089 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2090 const struct nft_rule *rule, int event)
2092 struct sk_buff *skb;
2096 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2099 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2103 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2104 event, 0, ctx->afi->family, ctx->table,
2111 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2112 ctx->report, GFP_KERNEL);
2115 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2118 struct nft_rule_dump_ctx {
2123 static int nf_tables_dump_rules(struct sk_buff *skb,
2124 struct netlink_callback *cb)
2126 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2127 const struct nft_rule_dump_ctx *ctx = cb->data;
2128 const struct nft_af_info *afi;
2129 const struct nft_table *table;
2130 const struct nft_chain *chain;
2131 const struct nft_rule *rule;
2132 unsigned int idx = 0, s_idx = cb->args[0];
2133 struct net *net = sock_net(skb->sk);
2134 int family = nfmsg->nfgen_family;
2137 cb->seq = net->nft.base_seq;
2139 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2140 if (family != NFPROTO_UNSPEC && family != afi->family)
2143 list_for_each_entry_rcu(table, &afi->tables, list) {
2144 if (ctx && ctx->table &&
2145 strcmp(ctx->table, table->name) != 0)
2148 list_for_each_entry_rcu(chain, &table->chains, list) {
2149 if (ctx && ctx->chain &&
2150 strcmp(ctx->chain, chain->name) != 0)
2153 list_for_each_entry_rcu(rule, &chain->rules, list) {
2154 if (!nft_is_active(net, rule))
2159 memset(&cb->args[1], 0,
2160 sizeof(cb->args) - sizeof(cb->args[0]));
2161 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2164 NLM_F_MULTI | NLM_F_APPEND,
2165 afi->family, table, chain, rule) < 0)
2168 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2182 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2184 struct nft_rule_dump_ctx *ctx = cb->data;
2194 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2195 struct sk_buff *skb, const struct nlmsghdr *nlh,
2196 const struct nlattr * const nla[],
2197 struct netlink_ext_ack *extack)
2199 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2200 u8 genmask = nft_genmask_cur(net);
2201 const struct nft_af_info *afi;
2202 const struct nft_table *table;
2203 const struct nft_chain *chain;
2204 const struct nft_rule *rule;
2205 struct sk_buff *skb2;
2206 int family = nfmsg->nfgen_family;
2209 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2210 struct netlink_dump_control c = {
2211 .dump = nf_tables_dump_rules,
2212 .done = nf_tables_dump_rules_done,
2215 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2216 struct nft_rule_dump_ctx *ctx;
2218 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
2222 if (nla[NFTA_RULE_TABLE]) {
2223 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2230 if (nla[NFTA_RULE_CHAIN]) {
2231 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2242 return netlink_dump_start(nlsk, skb, nlh, &c);
2245 afi = nf_tables_afinfo_lookup(net, family, false);
2247 return PTR_ERR(afi);
2249 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2251 return PTR_ERR(table);
2253 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2255 return PTR_ERR(chain);
2257 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2259 return PTR_ERR(rule);
2261 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2265 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2266 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2267 family, table, chain, rule);
2271 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2278 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2279 struct nft_rule *rule)
2281 struct nft_expr *expr, *next;
2284 * Careful: some expressions might not be initialized in case this
2285 * is called on error from nf_tables_newrule().
2287 expr = nft_expr_first(rule);
2288 while (expr != nft_expr_last(rule) && expr->ops) {
2289 next = nft_expr_next(expr);
2290 nf_tables_expr_destroy(ctx, expr);
2296 static void nf_tables_rule_release(const struct nft_ctx *ctx,
2297 struct nft_rule *rule)
2299 nft_rule_expr_deactivate(ctx, rule);
2300 nf_tables_rule_destroy(ctx, rule);
2303 #define NFT_RULE_MAXEXPRS 128
2305 static struct nft_expr_info *info;
2307 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2308 struct sk_buff *skb, const struct nlmsghdr *nlh,
2309 const struct nlattr * const nla[],
2310 struct netlink_ext_ack *extack)
2312 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2313 u8 genmask = nft_genmask_next(net);
2314 struct nft_af_info *afi;
2315 struct nft_table *table;
2316 struct nft_chain *chain;
2317 struct nft_rule *rule, *old_rule = NULL;
2318 struct nft_userdata *udata;
2319 struct nft_trans *trans = NULL;
2320 struct nft_expr *expr;
2323 unsigned int size, i, n, ulen = 0, usize = 0;
2326 u64 handle, pos_handle;
2328 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2330 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2332 return PTR_ERR(afi);
2334 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2336 return PTR_ERR(table);
2338 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2340 return PTR_ERR(chain);
2342 if (nla[NFTA_RULE_HANDLE]) {
2343 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2344 rule = __nf_tables_rule_lookup(chain, handle);
2346 return PTR_ERR(rule);
2348 if (nlh->nlmsg_flags & NLM_F_EXCL)
2350 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2355 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2357 handle = nf_tables_alloc_handle(table);
2359 if (chain->use == UINT_MAX)
2363 if (nla[NFTA_RULE_POSITION]) {
2364 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2367 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2368 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2369 if (IS_ERR(old_rule))
2370 return PTR_ERR(old_rule);
2373 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2377 if (nla[NFTA_RULE_EXPRESSIONS]) {
2378 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2380 if (nla_type(tmp) != NFTA_LIST_ELEM)
2382 if (n == NFT_RULE_MAXEXPRS)
2384 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2387 size += info[n].ops->size;
2391 /* Check for overflow of dlen field */
2393 if (size >= 1 << 12)
2396 if (nla[NFTA_RULE_USERDATA]) {
2397 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2399 usize = sizeof(struct nft_userdata) + ulen;
2403 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2407 nft_activate_next(net, rule);
2409 rule->handle = handle;
2411 rule->udata = ulen ? 1 : 0;
2414 udata = nft_userdata(rule);
2415 udata->len = ulen - 1;
2416 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2419 expr = nft_expr_first(rule);
2420 for (i = 0; i < n; i++) {
2421 err = nf_tables_newexpr(&ctx, &info[i], expr);
2425 expr = nft_expr_next(expr);
2428 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2429 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
2430 if (trans == NULL) {
2434 err = nft_delrule(&ctx, old_rule);
2436 nft_trans_destroy(trans);
2440 list_add_tail_rcu(&rule->list, &old_rule->list);
2442 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2447 if (nlh->nlmsg_flags & NLM_F_APPEND) {
2449 list_add_rcu(&rule->list, &old_rule->list);
2451 list_add_tail_rcu(&rule->list, &chain->rules);
2454 list_add_tail_rcu(&rule->list, &old_rule->list);
2456 list_add_rcu(&rule->list, &chain->rules);
2463 nf_tables_rule_release(&ctx, rule);
2465 for (i = 0; i < n; i++) {
2466 if (info[i].ops != NULL)
2467 module_put(info[i].ops->type->owner);
2472 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2473 const struct nlattr *nla)
2475 u32 id = ntohl(nla_get_be32(nla));
2476 struct nft_trans *trans;
2478 list_for_each_entry(trans, &net->nft.commit_list, list) {
2479 struct nft_rule *rule = nft_trans_rule(trans);
2481 if (trans->msg_type == NFT_MSG_NEWRULE &&
2482 id == nft_trans_rule_id(trans))
2485 return ERR_PTR(-ENOENT);
2488 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2489 struct sk_buff *skb, const struct nlmsghdr *nlh,
2490 const struct nlattr * const nla[],
2491 struct netlink_ext_ack *extack)
2493 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2494 u8 genmask = nft_genmask_next(net);
2495 struct nft_af_info *afi;
2496 struct nft_table *table;
2497 struct nft_chain *chain = NULL;
2498 struct nft_rule *rule;
2499 int family = nfmsg->nfgen_family, err = 0;
2502 afi = nf_tables_afinfo_lookup(net, family, false);
2504 return PTR_ERR(afi);
2506 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2508 return PTR_ERR(table);
2510 if (nla[NFTA_RULE_CHAIN]) {
2511 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2514 return PTR_ERR(chain);
2517 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2520 if (nla[NFTA_RULE_HANDLE]) {
2521 rule = nf_tables_rule_lookup(chain,
2522 nla[NFTA_RULE_HANDLE]);
2524 return PTR_ERR(rule);
2526 err = nft_delrule(&ctx, rule);
2527 } else if (nla[NFTA_RULE_ID]) {
2528 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2530 return PTR_ERR(rule);
2532 err = nft_delrule(&ctx, rule);
2534 err = nft_delrule_by_chain(&ctx);
2537 list_for_each_entry(chain, &table->chains, list) {
2538 if (!nft_is_active_next(net, chain))
2542 err = nft_delrule_by_chain(&ctx);
2555 static LIST_HEAD(nf_tables_set_types);
2557 int nft_register_set(struct nft_set_type *type)
2559 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2560 list_add_tail_rcu(&type->list, &nf_tables_set_types);
2561 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2564 EXPORT_SYMBOL_GPL(nft_register_set);
2566 void nft_unregister_set(struct nft_set_type *type)
2568 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2569 list_del_rcu(&type->list);
2570 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2572 EXPORT_SYMBOL_GPL(nft_unregister_set);
2574 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
2575 NFT_SET_TIMEOUT | NFT_SET_OBJECT)
2577 static bool nft_set_ops_candidate(const struct nft_set_ops *ops, u32 flags)
2579 return (flags & ops->features) == (flags & NFT_SET_FEATURES);
2583 * Select a set implementation based on the data characteristics and the
2584 * given policy. The total memory use might not be known if no size is
2585 * given, in that case the amount of memory per element is used.
2587 static const struct nft_set_ops *
2588 nft_select_set_ops(const struct nft_ctx *ctx,
2589 const struct nlattr * const nla[],
2590 const struct nft_set_desc *desc,
2591 enum nft_set_policies policy)
2593 const struct nft_set_ops *ops, *bops;
2594 struct nft_set_estimate est, best;
2595 const struct nft_set_type *type;
2598 #ifdef CONFIG_MODULES
2599 if (list_empty(&nf_tables_set_types)) {
2600 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2601 request_module("nft-set");
2602 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2603 if (!list_empty(&nf_tables_set_types))
2604 return ERR_PTR(-EAGAIN);
2607 if (nla[NFTA_SET_FLAGS] != NULL)
2608 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2615 list_for_each_entry(type, &nf_tables_set_types, list) {
2616 if (!type->select_ops)
2619 ops = type->select_ops(ctx, desc, flags);
2623 if (!nft_set_ops_candidate(ops, flags))
2625 if (!ops->estimate(desc, flags, &est))
2629 case NFT_SET_POL_PERFORMANCE:
2630 if (est.lookup < best.lookup)
2632 if (est.lookup == best.lookup) {
2634 if (est.space < best.space)
2636 } else if (est.size < best.size) {
2641 case NFT_SET_POL_MEMORY:
2643 if (est.space < best.space)
2645 if (est.space == best.space &&
2646 est.lookup < best.lookup)
2648 } else if (est.size < best.size) {
2656 if (!try_module_get(type->owner))
2659 module_put(bops->type->owner);
2668 return ERR_PTR(-EOPNOTSUPP);
2671 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2672 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2673 .len = NFT_TABLE_MAXNAMELEN - 1 },
2674 [NFTA_SET_NAME] = { .type = NLA_STRING,
2675 .len = NFT_SET_MAXNAMELEN - 1 },
2676 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2677 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2678 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2679 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2680 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2681 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2682 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2683 [NFTA_SET_ID] = { .type = NLA_U32 },
2684 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2685 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2686 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2687 .len = NFT_USERDATA_MAXLEN },
2688 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
2691 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2692 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2695 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2696 const struct sk_buff *skb,
2697 const struct nlmsghdr *nlh,
2698 const struct nlattr * const nla[],
2701 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2702 struct nft_af_info *afi = NULL;
2703 struct nft_table *table = NULL;
2705 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2706 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2708 return PTR_ERR(afi);
2711 if (nla[NFTA_SET_TABLE] != NULL) {
2713 return -EAFNOSUPPORT;
2715 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2718 return PTR_ERR(table);
2721 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
2725 static struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2726 const struct nlattr *nla, u8 genmask)
2728 struct nft_set *set;
2731 return ERR_PTR(-EINVAL);
2733 list_for_each_entry(set, &table->sets, list) {
2734 if (!nla_strcmp(nla, set->name) &&
2735 nft_active_genmask(set, genmask))
2738 return ERR_PTR(-ENOENT);
2741 static struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2742 const struct nlattr *nla,
2745 struct nft_trans *trans;
2746 u32 id = ntohl(nla_get_be32(nla));
2748 list_for_each_entry(trans, &net->nft.commit_list, list) {
2749 if (trans->msg_type == NFT_MSG_NEWSET) {
2750 struct nft_set *set = nft_trans_set(trans);
2752 if (id == nft_trans_set_id(trans) &&
2753 nft_active_genmask(set, genmask))
2757 return ERR_PTR(-ENOENT);
2760 struct nft_set *nft_set_lookup(const struct net *net,
2761 const struct nft_table *table,
2762 const struct nlattr *nla_set_name,
2763 const struct nlattr *nla_set_id,
2766 struct nft_set *set;
2768 set = nf_tables_set_lookup(table, nla_set_name, genmask);
2773 set = nf_tables_set_lookup_byid(net, nla_set_id, genmask);
2777 EXPORT_SYMBOL_GPL(nft_set_lookup);
2779 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2782 const struct nft_set *i;
2784 unsigned long *inuse;
2785 unsigned int n = 0, min = 0;
2787 p = strchr(name, '%');
2789 if (p[1] != 'd' || strchr(p + 2, '%'))
2792 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2796 list_for_each_entry(i, &ctx->table->sets, list) {
2799 if (!nft_is_active_next(ctx->net, set))
2801 if (!sscanf(i->name, name, &tmp))
2803 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2806 set_bit(tmp - min, inuse);
2809 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2810 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2811 min += BITS_PER_BYTE * PAGE_SIZE;
2812 memset(inuse, 0, PAGE_SIZE);
2815 free_page((unsigned long)inuse);
2818 set->name = kasprintf(GFP_KERNEL, name, min + n);
2822 list_for_each_entry(i, &ctx->table->sets, list) {
2823 if (!nft_is_active_next(ctx->net, i))
2825 if (!strcmp(set->name, i->name)) {
2833 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2834 const struct nft_set *set, u16 event, u16 flags)
2836 struct nfgenmsg *nfmsg;
2837 struct nlmsghdr *nlh;
2838 struct nlattr *desc;
2839 u32 portid = ctx->portid;
2842 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2843 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2846 goto nla_put_failure;
2848 nfmsg = nlmsg_data(nlh);
2849 nfmsg->nfgen_family = ctx->afi->family;
2850 nfmsg->version = NFNETLINK_V0;
2851 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2853 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2854 goto nla_put_failure;
2855 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2856 goto nla_put_failure;
2857 if (set->flags != 0)
2858 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2859 goto nla_put_failure;
2861 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2862 goto nla_put_failure;
2863 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2864 goto nla_put_failure;
2865 if (set->flags & NFT_SET_MAP) {
2866 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2867 goto nla_put_failure;
2868 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2869 goto nla_put_failure;
2871 if (set->flags & NFT_SET_OBJECT &&
2872 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
2873 goto nla_put_failure;
2876 nla_put_be64(skb, NFTA_SET_TIMEOUT,
2877 cpu_to_be64(jiffies_to_msecs(set->timeout)),
2879 goto nla_put_failure;
2881 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2882 goto nla_put_failure;
2884 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2885 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2886 goto nla_put_failure;
2890 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2891 goto nla_put_failure;
2893 desc = nla_nest_start(skb, NFTA_SET_DESC);
2895 goto nla_put_failure;
2897 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2898 goto nla_put_failure;
2899 nla_nest_end(skb, desc);
2901 nlmsg_end(skb, nlh);
2905 nlmsg_trim(skb, nlh);
2909 static void nf_tables_set_notify(const struct nft_ctx *ctx,
2910 const struct nft_set *set, int event,
2913 struct sk_buff *skb;
2914 u32 portid = ctx->portid;
2918 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2921 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2925 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2931 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
2935 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
2938 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2940 const struct nft_set *set;
2941 unsigned int idx, s_idx = cb->args[0];
2942 struct nft_af_info *afi;
2943 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2944 struct net *net = sock_net(skb->sk);
2945 int cur_family = cb->args[3];
2946 struct nft_ctx *ctx = cb->data, ctx_set;
2952 cb->seq = net->nft.base_seq;
2954 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2955 if (ctx->afi && ctx->afi != afi)
2959 if (afi->family != cur_family)
2964 list_for_each_entry_rcu(table, &afi->tables, list) {
2965 if (ctx->table && ctx->table != table)
2969 if (cur_table != table)
2975 list_for_each_entry_rcu(set, &table->sets, list) {
2978 if (!nft_is_active(net, set))
2982 ctx_set.table = table;
2984 if (nf_tables_fill_set(skb, &ctx_set, set,
2988 cb->args[2] = (unsigned long) table;
2989 cb->args[3] = afi->family;
2992 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3006 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3012 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3013 struct sk_buff *skb, const struct nlmsghdr *nlh,
3014 const struct nlattr * const nla[],
3015 struct netlink_ext_ack *extack)
3017 u8 genmask = nft_genmask_cur(net);
3018 const struct nft_set *set;
3020 struct sk_buff *skb2;
3021 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3024 /* Verify existence before starting dump */
3025 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
3029 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3030 struct netlink_dump_control c = {
3031 .dump = nf_tables_dump_sets,
3032 .done = nf_tables_dump_sets_done,
3034 struct nft_ctx *ctx_dump;
3036 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
3037 if (ctx_dump == NULL)
3043 return netlink_dump_start(nlsk, skb, nlh, &c);
3046 /* Only accept unspec with dump */
3047 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3048 return -EAFNOSUPPORT;
3049 if (!nla[NFTA_SET_TABLE])
3052 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3054 return PTR_ERR(set);
3056 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3060 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3064 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3071 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
3072 struct nft_set_desc *desc,
3073 const struct nlattr *nla)
3075 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
3078 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
3079 nft_set_desc_policy, NULL);
3083 if (da[NFTA_SET_DESC_SIZE] != NULL)
3084 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
3089 static int nf_tables_newset(struct net *net, struct sock *nlsk,
3090 struct sk_buff *skb, const struct nlmsghdr *nlh,
3091 const struct nlattr * const nla[],
3092 struct netlink_ext_ack *extack)
3094 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3095 u8 genmask = nft_genmask_next(net);
3096 const struct nft_set_ops *ops;
3097 struct nft_af_info *afi;
3098 struct nft_table *table;
3099 struct nft_set *set;
3105 u32 ktype, dtype, flags, policy, gc_int, objtype;
3106 struct nft_set_desc desc;
3107 unsigned char *udata;
3111 if (nla[NFTA_SET_TABLE] == NULL ||
3112 nla[NFTA_SET_NAME] == NULL ||
3113 nla[NFTA_SET_KEY_LEN] == NULL ||
3114 nla[NFTA_SET_ID] == NULL)
3117 memset(&desc, 0, sizeof(desc));
3119 ktype = NFT_DATA_VALUE;
3120 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3121 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3122 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3126 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
3127 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
3131 if (nla[NFTA_SET_FLAGS] != NULL) {
3132 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3133 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
3134 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
3135 NFT_SET_MAP | NFT_SET_EVAL |
3138 /* Only one of these operations is supported */
3139 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
3140 (NFT_SET_MAP | NFT_SET_OBJECT))
3142 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3143 (NFT_SET_EVAL | NFT_SET_OBJECT))
3148 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3149 if (!(flags & NFT_SET_MAP))
3152 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3153 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3154 dtype != NFT_DATA_VERDICT)
3157 if (dtype != NFT_DATA_VERDICT) {
3158 if (nla[NFTA_SET_DATA_LEN] == NULL)
3160 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
3161 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
3164 desc.dlen = sizeof(struct nft_verdict);
3165 } else if (flags & NFT_SET_MAP)
3168 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3169 if (!(flags & NFT_SET_OBJECT))
3172 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3173 if (objtype == NFT_OBJECT_UNSPEC ||
3174 objtype > NFT_OBJECT_MAX)
3176 } else if (flags & NFT_SET_OBJECT)
3179 objtype = NFT_OBJECT_UNSPEC;
3182 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3183 if (!(flags & NFT_SET_TIMEOUT))
3185 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3186 nla[NFTA_SET_TIMEOUT])));
3189 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3190 if (!(flags & NFT_SET_TIMEOUT))
3192 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3195 policy = NFT_SET_POL_PERFORMANCE;
3196 if (nla[NFTA_SET_POLICY] != NULL)
3197 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3199 if (nla[NFTA_SET_DESC] != NULL) {
3200 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
3205 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
3207 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
3209 return PTR_ERR(afi);
3211 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
3213 return PTR_ERR(table);
3215 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
3217 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
3219 if (PTR_ERR(set) != -ENOENT)
3220 return PTR_ERR(set);
3222 if (nlh->nlmsg_flags & NLM_F_EXCL)
3224 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3229 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3232 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
3234 return PTR_ERR(ops);
3237 if (nla[NFTA_SET_USERDATA])
3238 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3241 if (ops->privsize != NULL)
3242 size = ops->privsize(nla, &desc);
3244 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3250 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3256 err = nf_tables_set_alloc_name(&ctx, set, name);
3263 udata = set->data + size;
3264 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3267 INIT_LIST_HEAD(&set->bindings);
3270 set->klen = desc.klen;
3272 set->objtype = objtype;
3273 set->dlen = desc.dlen;
3275 set->size = desc.size;
3276 set->policy = policy;
3279 set->timeout = timeout;
3280 set->gc_int = gc_int;
3282 err = ops->init(set, &desc, nla);
3286 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3290 list_add_tail_rcu(&set->list, &table->sets);
3301 module_put(ops->type->owner);
3305 static void nft_set_destroy(struct nft_set *set)
3307 set->ops->destroy(set);
3308 module_put(set->ops->type->owner);
3313 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3315 list_del_rcu(&set->list);
3316 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
3317 nft_set_destroy(set);
3320 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3321 struct sk_buff *skb, const struct nlmsghdr *nlh,
3322 const struct nlattr * const nla[],
3323 struct netlink_ext_ack *extack)
3325 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3326 u8 genmask = nft_genmask_next(net);
3327 struct nft_set *set;
3331 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3332 return -EAFNOSUPPORT;
3333 if (nla[NFTA_SET_TABLE] == NULL)
3336 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
3340 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3342 return PTR_ERR(set);
3344 if (!list_empty(&set->bindings) ||
3345 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0))
3348 return nft_delset(&ctx, set);
3351 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3352 struct nft_set *set,
3353 const struct nft_set_iter *iter,
3354 struct nft_set_elem *elem)
3356 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3357 enum nft_registers dreg;
3359 dreg = nft_type_to_reg(set->dtype);
3360 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3361 set->dtype == NFT_DATA_VERDICT ?
3362 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3366 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3367 struct nft_set_binding *binding)
3369 struct nft_set_binding *i;
3370 struct nft_set_iter iter;
3372 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
3375 if (binding->flags & NFT_SET_MAP) {
3376 /* If the set is already bound to the same chain all
3377 * jumps are already validated for that chain.
3379 list_for_each_entry(i, &set->bindings, list) {
3380 if (i->flags & NFT_SET_MAP &&
3381 i->chain == binding->chain)
3385 iter.genmask = nft_genmask_next(ctx->net);
3389 iter.fn = nf_tables_bind_check_setelem;
3391 set->ops->walk(ctx, set, &iter);
3396 binding->chain = ctx->chain;
3397 list_add_tail_rcu(&binding->list, &set->bindings);
3400 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3402 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3403 struct nft_set_binding *binding)
3405 list_del_rcu(&binding->list);
3407 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
3408 nft_is_active(ctx->net, set))
3409 nf_tables_set_destroy(ctx, set);
3411 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3413 const struct nft_set_ext_type nft_set_ext_types[] = {
3414 [NFT_SET_EXT_KEY] = {
3415 .align = __alignof__(u32),
3417 [NFT_SET_EXT_DATA] = {
3418 .align = __alignof__(u32),
3420 [NFT_SET_EXT_EXPR] = {
3421 .align = __alignof__(struct nft_expr),
3423 [NFT_SET_EXT_OBJREF] = {
3424 .len = sizeof(struct nft_object *),
3425 .align = __alignof__(struct nft_object *),
3427 [NFT_SET_EXT_FLAGS] = {
3429 .align = __alignof__(u8),
3431 [NFT_SET_EXT_TIMEOUT] = {
3433 .align = __alignof__(u64),
3435 [NFT_SET_EXT_EXPIRATION] = {
3436 .len = sizeof(unsigned long),
3437 .align = __alignof__(unsigned long),
3439 [NFT_SET_EXT_USERDATA] = {
3440 .len = sizeof(struct nft_userdata),
3441 .align = __alignof__(struct nft_userdata),
3444 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3450 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3451 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3452 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3453 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3454 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3455 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3456 .len = NFT_USERDATA_MAXLEN },
3457 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
3458 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING },
3461 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3462 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3463 .len = NFT_TABLE_MAXNAMELEN - 1 },
3464 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3465 .len = NFT_SET_MAXNAMELEN - 1 },
3466 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3467 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3470 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3471 const struct sk_buff *skb,
3472 const struct nlmsghdr *nlh,
3473 const struct nlattr * const nla[],
3476 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3477 struct nft_af_info *afi;
3478 struct nft_table *table;
3480 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3482 return PTR_ERR(afi);
3484 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3487 return PTR_ERR(table);
3489 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
3493 static int nf_tables_fill_setelem(struct sk_buff *skb,
3494 const struct nft_set *set,
3495 const struct nft_set_elem *elem)
3497 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3498 unsigned char *b = skb_tail_pointer(skb);
3499 struct nlattr *nest;
3501 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3503 goto nla_put_failure;
3505 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3506 NFT_DATA_VALUE, set->klen) < 0)
3507 goto nla_put_failure;
3509 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3510 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3511 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3513 goto nla_put_failure;
3515 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3516 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3517 goto nla_put_failure;
3519 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3520 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3521 (*nft_set_ext_obj(ext))->name) < 0)
3522 goto nla_put_failure;
3524 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3525 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3526 htonl(*nft_set_ext_flags(ext))))
3527 goto nla_put_failure;
3529 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3530 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3531 cpu_to_be64(jiffies_to_msecs(
3532 *nft_set_ext_timeout(ext))),
3534 goto nla_put_failure;
3536 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3537 unsigned long expires, now = jiffies;
3539 expires = *nft_set_ext_expiration(ext);
3540 if (time_before(now, expires))
3545 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3546 cpu_to_be64(jiffies_to_msecs(expires)),
3548 goto nla_put_failure;
3551 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3552 struct nft_userdata *udata;
3554 udata = nft_set_ext_userdata(ext);
3555 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3556 udata->len + 1, udata->data))
3557 goto nla_put_failure;
3560 nla_nest_end(skb, nest);
3568 struct nft_set_dump_args {
3569 const struct netlink_callback *cb;
3570 struct nft_set_iter iter;
3571 struct sk_buff *skb;
3574 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3575 struct nft_set *set,
3576 const struct nft_set_iter *iter,
3577 struct nft_set_elem *elem)
3579 struct nft_set_dump_args *args;
3581 args = container_of(iter, struct nft_set_dump_args, iter);
3582 return nf_tables_fill_setelem(args->skb, set, elem);
3585 struct nft_set_dump_ctx {
3586 const struct nft_set *set;
3590 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3592 struct nft_set_dump_ctx *dump_ctx = cb->data;
3593 struct net *net = sock_net(skb->sk);
3594 struct nft_af_info *afi;
3595 struct nft_table *table;
3596 struct nft_set *set;
3597 struct nft_set_dump_args args;
3598 bool set_found = false;
3599 struct nfgenmsg *nfmsg;
3600 struct nlmsghdr *nlh;
3601 struct nlattr *nest;
3606 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
3607 if (afi != dump_ctx->ctx.afi)
3610 list_for_each_entry_rcu(table, &afi->tables, list) {
3611 if (table != dump_ctx->ctx.table)
3614 list_for_each_entry_rcu(set, &table->sets, list) {
3615 if (set == dump_ctx->set) {
3630 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
3631 portid = NETLINK_CB(cb->skb).portid;
3632 seq = cb->nlh->nlmsg_seq;
3634 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3637 goto nla_put_failure;
3639 nfmsg = nlmsg_data(nlh);
3640 nfmsg->nfgen_family = afi->family;
3641 nfmsg->version = NFNETLINK_V0;
3642 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3644 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
3645 goto nla_put_failure;
3646 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3647 goto nla_put_failure;
3649 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3651 goto nla_put_failure;
3655 args.iter.genmask = nft_genmask_cur(net);
3656 args.iter.skip = cb->args[0];
3657 args.iter.count = 0;
3659 args.iter.fn = nf_tables_dump_setelem;
3660 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
3663 nla_nest_end(skb, nest);
3664 nlmsg_end(skb, nlh);
3666 if (args.iter.err && args.iter.err != -EMSGSIZE)
3667 return args.iter.err;
3668 if (args.iter.count == cb->args[0])
3671 cb->args[0] = args.iter.count;
3679 static int nf_tables_dump_set_done(struct netlink_callback *cb)
3685 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3686 struct sk_buff *skb, const struct nlmsghdr *nlh,
3687 const struct nlattr * const nla[],
3688 struct netlink_ext_ack *extack)
3690 u8 genmask = nft_genmask_cur(net);
3691 const struct nft_set *set;
3695 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3699 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3702 return PTR_ERR(set);
3704 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3705 struct netlink_dump_control c = {
3706 .dump = nf_tables_dump_set,
3707 .done = nf_tables_dump_set_done,
3709 struct nft_set_dump_ctx *dump_ctx;
3711 dump_ctx = kmalloc(sizeof(*dump_ctx), GFP_KERNEL);
3715 dump_ctx->set = set;
3716 dump_ctx->ctx = ctx;
3719 return netlink_dump_start(nlsk, skb, nlh, &c);
3724 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3725 const struct nft_ctx *ctx, u32 seq,
3726 u32 portid, int event, u16 flags,
3727 const struct nft_set *set,
3728 const struct nft_set_elem *elem)
3730 struct nfgenmsg *nfmsg;
3731 struct nlmsghdr *nlh;
3732 struct nlattr *nest;
3735 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3736 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3739 goto nla_put_failure;
3741 nfmsg = nlmsg_data(nlh);
3742 nfmsg->nfgen_family = ctx->afi->family;
3743 nfmsg->version = NFNETLINK_V0;
3744 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3746 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3747 goto nla_put_failure;
3748 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3749 goto nla_put_failure;
3751 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3753 goto nla_put_failure;
3755 err = nf_tables_fill_setelem(skb, set, elem);
3757 goto nla_put_failure;
3759 nla_nest_end(skb, nest);
3761 nlmsg_end(skb, nlh);
3765 nlmsg_trim(skb, nlh);
3769 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
3770 const struct nft_set *set,
3771 const struct nft_set_elem *elem,
3772 int event, u16 flags)
3774 struct net *net = ctx->net;
3775 u32 portid = ctx->portid;
3776 struct sk_buff *skb;
3779 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3782 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3786 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3793 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3797 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3800 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3802 struct nft_set *set)
3804 struct nft_trans *trans;
3806 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3810 nft_trans_elem_set(trans) = set;
3814 void *nft_set_elem_init(const struct nft_set *set,
3815 const struct nft_set_ext_tmpl *tmpl,
3816 const u32 *key, const u32 *data,
3817 u64 timeout, gfp_t gfp)
3819 struct nft_set_ext *ext;
3822 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3826 ext = nft_set_elem_ext(set, elem);
3827 nft_set_ext_init(ext, tmpl);
3829 memcpy(nft_set_ext_key(ext), key, set->klen);
3830 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3831 memcpy(nft_set_ext_data(ext), data, set->dlen);
3832 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3833 *nft_set_ext_expiration(ext) =
3835 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3836 *nft_set_ext_timeout(ext) = timeout;
3841 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
3844 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3846 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
3847 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3848 nft_data_release(nft_set_ext_data(ext), set->dtype);
3849 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3850 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3851 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
3852 (*nft_set_ext_obj(ext))->use--;
3855 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3857 /* Only called from commit path, nft_set_elem_deactivate() already deals with
3858 * the refcounting from the preparation phase.
3860 static void nf_tables_set_elem_destroy(const struct nft_set *set, void *elem)
3862 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3864 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3865 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3869 static int nft_setelem_parse_flags(const struct nft_set *set,
3870 const struct nlattr *attr, u32 *flags)
3875 *flags = ntohl(nla_get_be32(attr));
3876 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3878 if (!(set->flags & NFT_SET_INTERVAL) &&
3879 *flags & NFT_SET_ELEM_INTERVAL_END)
3885 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3886 const struct nlattr *attr, u32 nlmsg_flags)
3888 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3889 u8 genmask = nft_genmask_next(ctx->net);
3890 struct nft_data_desc d1, d2;
3891 struct nft_set_ext_tmpl tmpl;
3892 struct nft_set_ext *ext, *ext2;
3893 struct nft_set_elem elem;
3894 struct nft_set_binding *binding;
3895 struct nft_object *obj = NULL;
3896 struct nft_userdata *udata;
3897 struct nft_data data;
3898 enum nft_registers dreg;
3899 struct nft_trans *trans;
3905 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3906 nft_set_elem_policy, NULL);
3910 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3913 nft_set_ext_prepare(&tmpl);
3915 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3919 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3921 if (set->flags & NFT_SET_MAP) {
3922 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3923 !(flags & NFT_SET_ELEM_INTERVAL_END))
3926 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3930 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
3931 (nla[NFTA_SET_ELEM_DATA] ||
3932 nla[NFTA_SET_ELEM_OBJREF] ||
3933 nla[NFTA_SET_ELEM_TIMEOUT] ||
3934 nla[NFTA_SET_ELEM_EXPIRATION] ||
3935 nla[NFTA_SET_ELEM_USERDATA] ||
3936 nla[NFTA_SET_ELEM_EXPR]))
3940 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3941 if (!(set->flags & NFT_SET_TIMEOUT))
3943 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3944 nla[NFTA_SET_ELEM_TIMEOUT])));
3945 } else if (set->flags & NFT_SET_TIMEOUT) {
3946 timeout = set->timeout;
3949 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3950 nla[NFTA_SET_ELEM_KEY]);
3954 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3957 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3959 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3960 if (timeout != set->timeout)
3961 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3964 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
3965 if (!(set->flags & NFT_SET_OBJECT)) {
3969 obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
3970 set->objtype, genmask);
3975 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
3978 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3979 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3980 nla[NFTA_SET_ELEM_DATA]);
3985 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3988 dreg = nft_type_to_reg(set->dtype);
3989 list_for_each_entry(binding, &set->bindings, list) {
3990 struct nft_ctx bind_ctx = {
3993 .table = ctx->table,
3994 .chain = (struct nft_chain *)binding->chain,
3997 if (!(binding->flags & NFT_SET_MAP))
4000 err = nft_validate_register_store(&bind_ctx, dreg,
4007 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
4010 /* The full maximum length of userdata can exceed the maximum
4011 * offset value (U8_MAX) for following extensions, therefor it
4012 * must be the last extension added.
4015 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
4016 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
4018 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
4023 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
4024 timeout, GFP_KERNEL);
4025 if (elem.priv == NULL)
4028 ext = nft_set_elem_ext(set, elem.priv);
4030 *nft_set_ext_flags(ext) = flags;
4032 udata = nft_set_ext_userdata(ext);
4033 udata->len = ulen - 1;
4034 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
4037 *nft_set_ext_obj(ext) = obj;
4041 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
4045 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
4046 err = set->ops->insert(ctx->net, set, &elem, &ext2);
4048 if (err == -EEXIST) {
4049 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
4050 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
4051 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
4052 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
4056 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4057 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
4058 memcmp(nft_set_ext_data(ext),
4059 nft_set_ext_data(ext2), set->dlen) != 0) ||
4060 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4061 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
4062 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
4064 else if (!(nlmsg_flags & NLM_F_EXCL))
4071 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
4076 nft_trans_elem(trans) = elem;
4077 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4081 set->ops->remove(ctx->net, set, &elem);
4089 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4090 nft_data_release(&data, d2.type);
4092 nft_data_release(&elem.key.val, d1.type);
4097 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
4098 struct sk_buff *skb, const struct nlmsghdr *nlh,
4099 const struct nlattr * const nla[],
4100 struct netlink_ext_ack *extack)
4102 u8 genmask = nft_genmask_next(net);
4103 const struct nlattr *attr;
4104 struct nft_set *set;
4108 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
4111 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
4115 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4118 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
4119 set = nf_tables_set_lookup_byid(net,
4120 nla[NFTA_SET_ELEM_LIST_SET_ID],
4124 return PTR_ERR(set);
4127 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4130 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4131 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
4139 * nft_data_hold - hold a nft_data item
4141 * @data: struct nft_data to release
4142 * @type: type of data
4144 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4145 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
4146 * NFT_GOTO verdicts. This function must be called on active data objects
4147 * from the second phase of the commit protocol.
4149 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
4151 if (type == NFT_DATA_VERDICT) {
4152 switch (data->verdict.code) {
4155 data->verdict.chain->use++;
4161 static void nft_set_elem_activate(const struct net *net,
4162 const struct nft_set *set,
4163 struct nft_set_elem *elem)
4165 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4167 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4168 nft_data_hold(nft_set_ext_data(ext), set->dtype);
4169 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4170 (*nft_set_ext_obj(ext))->use++;
4173 static void nft_set_elem_deactivate(const struct net *net,
4174 const struct nft_set *set,
4175 struct nft_set_elem *elem)
4177 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4179 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4180 nft_data_release(nft_set_ext_data(ext), set->dtype);
4181 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4182 (*nft_set_ext_obj(ext))->use--;
4185 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
4186 const struct nlattr *attr)
4188 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4189 struct nft_set_ext_tmpl tmpl;
4190 struct nft_data_desc desc;
4191 struct nft_set_elem elem;
4192 struct nft_set_ext *ext;
4193 struct nft_trans *trans;
4198 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4199 nft_set_elem_policy, NULL);
4204 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4207 nft_set_ext_prepare(&tmpl);
4209 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4213 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4215 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4216 nla[NFTA_SET_ELEM_KEY]);
4221 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4224 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
4227 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
4229 if (elem.priv == NULL)
4232 ext = nft_set_elem_ext(set, elem.priv);
4234 *nft_set_ext_flags(ext) = flags;
4236 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
4237 if (trans == NULL) {
4242 priv = set->ops->deactivate(ctx->net, set, &elem);
4250 nft_set_elem_deactivate(ctx->net, set, &elem);
4252 nft_trans_elem(trans) = elem;
4253 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4261 nft_data_release(&elem.key.val, desc.type);
4266 static int nft_flush_set(const struct nft_ctx *ctx,
4267 struct nft_set *set,
4268 const struct nft_set_iter *iter,
4269 struct nft_set_elem *elem)
4271 struct nft_trans *trans;
4274 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
4275 sizeof(struct nft_trans_elem), GFP_ATOMIC);
4279 if (!set->ops->flush(ctx->net, set, elem->priv)) {
4285 nft_set_elem_deactivate(ctx->net, set, elem);
4286 nft_trans_elem_set(trans) = set;
4287 nft_trans_elem(trans) = *elem;
4288 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4296 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
4297 struct sk_buff *skb, const struct nlmsghdr *nlh,
4298 const struct nlattr * const nla[],
4299 struct netlink_ext_ack *extack)
4301 u8 genmask = nft_genmask_next(net);
4302 const struct nlattr *attr;
4303 struct nft_set *set;
4307 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
4311 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4314 return PTR_ERR(set);
4315 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4318 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
4319 struct nft_set_iter iter = {
4321 .fn = nft_flush_set,
4323 set->ops->walk(&ctx, set, &iter);
4328 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4329 err = nft_del_setelem(&ctx, set, attr);
4338 void nft_set_gc_batch_release(struct rcu_head *rcu)
4340 struct nft_set_gc_batch *gcb;
4343 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4344 for (i = 0; i < gcb->head.cnt; i++)
4345 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
4348 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4350 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4353 struct nft_set_gc_batch *gcb;
4355 gcb = kzalloc(sizeof(*gcb), gfp);
4358 gcb->head.set = set;
4361 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4368 * nft_register_obj- register nf_tables stateful object type
4371 * Registers the object type for use with nf_tables. Returns zero on
4372 * success or a negative errno code otherwise.
4374 int nft_register_obj(struct nft_object_type *obj_type)
4376 if (obj_type->type == NFT_OBJECT_UNSPEC)
4379 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4380 list_add_rcu(&obj_type->list, &nf_tables_objects);
4381 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4384 EXPORT_SYMBOL_GPL(nft_register_obj);
4387 * nft_unregister_obj - unregister nf_tables object type
4390 * Unregisters the object type for use with nf_tables.
4392 void nft_unregister_obj(struct nft_object_type *obj_type)
4394 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4395 list_del_rcu(&obj_type->list);
4396 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4398 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4400 struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
4401 const struct nlattr *nla,
4402 u32 objtype, u8 genmask)
4404 struct nft_object *obj;
4406 list_for_each_entry(obj, &table->objects, list) {
4407 if (!nla_strcmp(nla, obj->name) &&
4408 objtype == obj->ops->type->type &&
4409 nft_active_genmask(obj, genmask))
4412 return ERR_PTR(-ENOENT);
4414 EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
4416 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4417 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4418 .len = NFT_TABLE_MAXNAMELEN - 1 },
4419 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4420 .len = NFT_OBJ_MAXNAMELEN - 1 },
4421 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4422 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4425 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4426 const struct nft_object_type *type,
4427 const struct nlattr *attr)
4429 struct nlattr *tb[type->maxattr + 1];
4430 const struct nft_object_ops *ops;
4431 struct nft_object *obj;
4435 err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
4440 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4443 if (type->select_ops) {
4444 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
4454 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
4458 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
4468 return ERR_PTR(err);
4471 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
4472 struct nft_object *obj, bool reset)
4474 struct nlattr *nest;
4476 nest = nla_nest_start(skb, attr);
4478 goto nla_put_failure;
4479 if (obj->ops->dump(skb, obj, reset) < 0)
4480 goto nla_put_failure;
4481 nla_nest_end(skb, nest);
4488 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4490 const struct nft_object_type *type;
4492 list_for_each_entry(type, &nf_tables_objects, list) {
4493 if (objtype == type->type)
4499 static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4501 const struct nft_object_type *type;
4503 type = __nft_obj_type_get(objtype);
4504 if (type != NULL && try_module_get(type->owner))
4507 #ifdef CONFIG_MODULES
4509 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4510 request_module("nft-obj-%u", objtype);
4511 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4512 if (__nft_obj_type_get(objtype))
4513 return ERR_PTR(-EAGAIN);
4516 return ERR_PTR(-ENOENT);
4519 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4520 struct sk_buff *skb, const struct nlmsghdr *nlh,
4521 const struct nlattr * const nla[],
4522 struct netlink_ext_ack *extack)
4524 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4525 const struct nft_object_type *type;
4526 u8 genmask = nft_genmask_next(net);
4527 int family = nfmsg->nfgen_family;
4528 struct nft_af_info *afi;
4529 struct nft_table *table;
4530 struct nft_object *obj;
4535 if (!nla[NFTA_OBJ_TYPE] ||
4536 !nla[NFTA_OBJ_NAME] ||
4537 !nla[NFTA_OBJ_DATA])
4540 afi = nf_tables_afinfo_lookup(net, family, true);
4542 return PTR_ERR(afi);
4544 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4546 return PTR_ERR(table);
4548 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4549 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4556 if (nlh->nlmsg_flags & NLM_F_EXCL)
4562 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4564 type = nft_obj_type_get(objtype);
4566 return PTR_ERR(type);
4568 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
4574 obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
4580 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4584 list_add_tail_rcu(&obj->list, &table->objects);
4590 if (obj->ops->destroy)
4591 obj->ops->destroy(obj);
4594 module_put(type->owner);
4598 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4599 u32 portid, u32 seq, int event, u32 flags,
4600 int family, const struct nft_table *table,
4601 struct nft_object *obj, bool reset)
4603 struct nfgenmsg *nfmsg;
4604 struct nlmsghdr *nlh;
4606 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4607 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4609 goto nla_put_failure;
4611 nfmsg = nlmsg_data(nlh);
4612 nfmsg->nfgen_family = family;
4613 nfmsg->version = NFNETLINK_V0;
4614 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4616 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4617 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
4618 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
4619 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
4620 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
4621 goto nla_put_failure;
4623 nlmsg_end(skb, nlh);
4627 nlmsg_trim(skb, nlh);
4631 struct nft_obj_filter {
4636 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4638 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4639 const struct nft_af_info *afi;
4640 const struct nft_table *table;
4641 unsigned int idx = 0, s_idx = cb->args[0];
4642 struct nft_obj_filter *filter = cb->data;
4643 struct net *net = sock_net(skb->sk);
4644 int family = nfmsg->nfgen_family;
4645 struct nft_object *obj;
4648 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4652 cb->seq = net->nft.base_seq;
4654 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
4655 if (family != NFPROTO_UNSPEC && family != afi->family)
4658 list_for_each_entry_rcu(table, &afi->tables, list) {
4659 list_for_each_entry_rcu(obj, &table->objects, list) {
4660 if (!nft_is_active(net, obj))
4665 memset(&cb->args[1], 0,
4666 sizeof(cb->args) - sizeof(cb->args[0]));
4667 if (filter && filter->table &&
4668 strcmp(filter->table, table->name))
4671 filter->type != NFT_OBJECT_UNSPEC &&
4672 obj->ops->type->type != filter->type)
4675 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4678 NLM_F_MULTI | NLM_F_APPEND,
4679 afi->family, table, obj, reset) < 0)
4682 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4695 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4697 struct nft_obj_filter *filter = cb->data;
4700 kfree(filter->table);
4707 static struct nft_obj_filter *
4708 nft_obj_filter_alloc(const struct nlattr * const nla[])
4710 struct nft_obj_filter *filter;
4712 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
4714 return ERR_PTR(-ENOMEM);
4716 if (nla[NFTA_OBJ_TABLE]) {
4717 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_KERNEL);
4718 if (!filter->table) {
4720 return ERR_PTR(-ENOMEM);
4723 if (nla[NFTA_OBJ_TYPE])
4724 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4729 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
4730 struct sk_buff *skb, const struct nlmsghdr *nlh,
4731 const struct nlattr * const nla[],
4732 struct netlink_ext_ack *extack)
4734 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4735 u8 genmask = nft_genmask_cur(net);
4736 int family = nfmsg->nfgen_family;
4737 const struct nft_af_info *afi;
4738 const struct nft_table *table;
4739 struct nft_object *obj;
4740 struct sk_buff *skb2;
4745 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4746 struct netlink_dump_control c = {
4747 .dump = nf_tables_dump_obj,
4748 .done = nf_tables_dump_obj_done,
4751 if (nla[NFTA_OBJ_TABLE] ||
4752 nla[NFTA_OBJ_TYPE]) {
4753 struct nft_obj_filter *filter;
4755 filter = nft_obj_filter_alloc(nla);
4761 return netlink_dump_start(nlsk, skb, nlh, &c);
4764 if (!nla[NFTA_OBJ_NAME] ||
4765 !nla[NFTA_OBJ_TYPE])
4768 afi = nf_tables_afinfo_lookup(net, family, false);
4770 return PTR_ERR(afi);
4772 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4774 return PTR_ERR(table);
4776 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4777 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4779 return PTR_ERR(obj);
4781 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4785 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4788 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
4789 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
4790 family, table, obj, reset);
4794 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4800 static void nft_obj_destroy(struct nft_object *obj)
4802 if (obj->ops->destroy)
4803 obj->ops->destroy(obj);
4805 module_put(obj->ops->type->owner);
4810 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
4811 struct sk_buff *skb, const struct nlmsghdr *nlh,
4812 const struct nlattr * const nla[],
4813 struct netlink_ext_ack *extack)
4815 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4816 u8 genmask = nft_genmask_next(net);
4817 int family = nfmsg->nfgen_family;
4818 struct nft_af_info *afi;
4819 struct nft_table *table;
4820 struct nft_object *obj;
4824 if (!nla[NFTA_OBJ_TYPE] ||
4825 !nla[NFTA_OBJ_NAME])
4828 afi = nf_tables_afinfo_lookup(net, family, true);
4830 return PTR_ERR(afi);
4832 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4834 return PTR_ERR(table);
4836 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4837 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4839 return PTR_ERR(obj);
4843 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4845 return nft_delobj(&ctx, obj);
4848 void nft_obj_notify(struct net *net, struct nft_table *table,
4849 struct nft_object *obj, u32 portid, u32 seq, int event,
4850 int family, int report, gfp_t gfp)
4852 struct sk_buff *skb;
4856 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4859 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
4863 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
4870 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
4873 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4875 EXPORT_SYMBOL_GPL(nft_obj_notify);
4877 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
4878 struct nft_object *obj, int event)
4880 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
4881 ctx->afi->family, ctx->report, GFP_KERNEL);
4884 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
4885 u32 portid, u32 seq)
4887 struct nlmsghdr *nlh;
4888 struct nfgenmsg *nfmsg;
4889 char buf[TASK_COMM_LEN];
4890 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
4892 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
4894 goto nla_put_failure;
4896 nfmsg = nlmsg_data(nlh);
4897 nfmsg->nfgen_family = AF_UNSPEC;
4898 nfmsg->version = NFNETLINK_V0;
4899 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4901 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
4902 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
4903 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
4904 goto nla_put_failure;
4906 nlmsg_end(skb, nlh);
4910 nlmsg_trim(skb, nlh);
4914 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
4917 struct nlmsghdr *nlh = nlmsg_hdr(skb);
4918 struct sk_buff *skb2;
4921 if (nlmsg_report(nlh) &&
4922 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4925 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4929 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4936 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4937 nlmsg_report(nlh), GFP_KERNEL);
4940 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4944 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
4945 struct sk_buff *skb, const struct nlmsghdr *nlh,
4946 const struct nlattr * const nla[],
4947 struct netlink_ext_ack *extack)
4949 struct sk_buff *skb2;
4952 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4956 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4961 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4967 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
4968 [NFT_MSG_NEWTABLE] = {
4969 .call_batch = nf_tables_newtable,
4970 .attr_count = NFTA_TABLE_MAX,
4971 .policy = nft_table_policy,
4973 [NFT_MSG_GETTABLE] = {
4974 .call = nf_tables_gettable,
4975 .attr_count = NFTA_TABLE_MAX,
4976 .policy = nft_table_policy,
4978 [NFT_MSG_DELTABLE] = {
4979 .call_batch = nf_tables_deltable,
4980 .attr_count = NFTA_TABLE_MAX,
4981 .policy = nft_table_policy,
4983 [NFT_MSG_NEWCHAIN] = {
4984 .call_batch = nf_tables_newchain,
4985 .attr_count = NFTA_CHAIN_MAX,
4986 .policy = nft_chain_policy,
4988 [NFT_MSG_GETCHAIN] = {
4989 .call = nf_tables_getchain,
4990 .attr_count = NFTA_CHAIN_MAX,
4991 .policy = nft_chain_policy,
4993 [NFT_MSG_DELCHAIN] = {
4994 .call_batch = nf_tables_delchain,
4995 .attr_count = NFTA_CHAIN_MAX,
4996 .policy = nft_chain_policy,
4998 [NFT_MSG_NEWRULE] = {
4999 .call_batch = nf_tables_newrule,
5000 .attr_count = NFTA_RULE_MAX,
5001 .policy = nft_rule_policy,
5003 [NFT_MSG_GETRULE] = {
5004 .call = nf_tables_getrule,
5005 .attr_count = NFTA_RULE_MAX,
5006 .policy = nft_rule_policy,
5008 [NFT_MSG_DELRULE] = {
5009 .call_batch = nf_tables_delrule,
5010 .attr_count = NFTA_RULE_MAX,
5011 .policy = nft_rule_policy,
5013 [NFT_MSG_NEWSET] = {
5014 .call_batch = nf_tables_newset,
5015 .attr_count = NFTA_SET_MAX,
5016 .policy = nft_set_policy,
5018 [NFT_MSG_GETSET] = {
5019 .call = nf_tables_getset,
5020 .attr_count = NFTA_SET_MAX,
5021 .policy = nft_set_policy,
5023 [NFT_MSG_DELSET] = {
5024 .call_batch = nf_tables_delset,
5025 .attr_count = NFTA_SET_MAX,
5026 .policy = nft_set_policy,
5028 [NFT_MSG_NEWSETELEM] = {
5029 .call_batch = nf_tables_newsetelem,
5030 .attr_count = NFTA_SET_ELEM_LIST_MAX,
5031 .policy = nft_set_elem_list_policy,
5033 [NFT_MSG_GETSETELEM] = {
5034 .call = nf_tables_getsetelem,
5035 .attr_count = NFTA_SET_ELEM_LIST_MAX,
5036 .policy = nft_set_elem_list_policy,
5038 [NFT_MSG_DELSETELEM] = {
5039 .call_batch = nf_tables_delsetelem,
5040 .attr_count = NFTA_SET_ELEM_LIST_MAX,
5041 .policy = nft_set_elem_list_policy,
5043 [NFT_MSG_GETGEN] = {
5044 .call = nf_tables_getgen,
5046 [NFT_MSG_NEWOBJ] = {
5047 .call_batch = nf_tables_newobj,
5048 .attr_count = NFTA_OBJ_MAX,
5049 .policy = nft_obj_policy,
5051 [NFT_MSG_GETOBJ] = {
5052 .call = nf_tables_getobj,
5053 .attr_count = NFTA_OBJ_MAX,
5054 .policy = nft_obj_policy,
5056 [NFT_MSG_DELOBJ] = {
5057 .call_batch = nf_tables_delobj,
5058 .attr_count = NFTA_OBJ_MAX,
5059 .policy = nft_obj_policy,
5061 [NFT_MSG_GETOBJ_RESET] = {
5062 .call = nf_tables_getobj,
5063 .attr_count = NFTA_OBJ_MAX,
5064 .policy = nft_obj_policy,
5068 static void nft_chain_commit_update(struct nft_trans *trans)
5070 struct nft_base_chain *basechain;
5072 if (nft_trans_chain_name(trans))
5073 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
5075 if (!nft_is_base_chain(trans->ctx.chain))
5078 basechain = nft_base_chain(trans->ctx.chain);
5079 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
5081 switch (nft_trans_chain_policy(trans)) {
5084 basechain->policy = nft_trans_chain_policy(trans);
5089 static void nf_tables_commit_release(struct nft_trans *trans)
5091 switch (trans->msg_type) {
5092 case NFT_MSG_DELTABLE:
5093 nf_tables_table_destroy(&trans->ctx);
5095 case NFT_MSG_NEWCHAIN:
5096 kfree(nft_trans_chain_name(trans));
5098 case NFT_MSG_DELCHAIN:
5099 nf_tables_chain_destroy(trans->ctx.chain);
5101 case NFT_MSG_DELRULE:
5102 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
5104 case NFT_MSG_DELSET:
5105 nft_set_destroy(nft_trans_set(trans));
5107 case NFT_MSG_DELSETELEM:
5108 nf_tables_set_elem_destroy(nft_trans_elem_set(trans),
5109 nft_trans_elem(trans).priv);
5111 case NFT_MSG_DELOBJ:
5112 nft_obj_destroy(nft_trans_obj(trans));
5118 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
5120 struct nft_trans *trans, *next;
5121 struct nft_trans_elem *te;
5123 /* Bump generation counter, invalidate any dump in progress */
5124 while (++net->nft.base_seq == 0);
5126 /* A new generation has just started */
5127 net->nft.gencursor = nft_gencursor_next(net);
5129 /* Make sure all packets have left the previous generation before
5130 * purging old rules.
5134 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
5135 switch (trans->msg_type) {
5136 case NFT_MSG_NEWTABLE:
5137 if (nft_trans_table_update(trans)) {
5138 if (!nft_trans_table_enable(trans)) {
5139 nf_tables_table_disable(net,
5142 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
5145 nft_clear(net, trans->ctx.table);
5147 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
5148 nft_trans_destroy(trans);
5150 case NFT_MSG_DELTABLE:
5151 list_del_rcu(&trans->ctx.table->list);
5152 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
5154 case NFT_MSG_NEWCHAIN:
5155 if (nft_trans_chain_update(trans)) {
5156 nft_chain_commit_update(trans);
5157 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
5158 /* trans destroyed after rcu grace period */
5160 nft_clear(net, trans->ctx.chain);
5161 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
5162 nft_trans_destroy(trans);
5165 case NFT_MSG_DELCHAIN:
5166 list_del_rcu(&trans->ctx.chain->list);
5167 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
5168 nf_tables_unregister_hooks(trans->ctx.net,
5171 trans->ctx.afi->nops);
5173 case NFT_MSG_NEWRULE:
5174 nft_clear(trans->ctx.net, nft_trans_rule(trans));
5175 nf_tables_rule_notify(&trans->ctx,
5176 nft_trans_rule(trans),
5178 nft_trans_destroy(trans);
5180 case NFT_MSG_DELRULE:
5181 list_del_rcu(&nft_trans_rule(trans)->list);
5182 nf_tables_rule_notify(&trans->ctx,
5183 nft_trans_rule(trans),
5186 case NFT_MSG_NEWSET:
5187 nft_clear(net, nft_trans_set(trans));
5188 /* This avoids hitting -EBUSY when deleting the table
5189 * from the transaction.
5191 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
5192 !list_empty(&nft_trans_set(trans)->bindings))
5193 trans->ctx.table->use--;
5195 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
5196 NFT_MSG_NEWSET, GFP_KERNEL);
5197 nft_trans_destroy(trans);
5199 case NFT_MSG_DELSET:
5200 list_del_rcu(&nft_trans_set(trans)->list);
5201 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
5202 NFT_MSG_DELSET, GFP_KERNEL);
5204 case NFT_MSG_NEWSETELEM:
5205 te = (struct nft_trans_elem *)trans->data;
5207 te->set->ops->activate(net, te->set, &te->elem);
5208 nf_tables_setelem_notify(&trans->ctx, te->set,
5210 NFT_MSG_NEWSETELEM, 0);
5211 nft_trans_destroy(trans);
5213 case NFT_MSG_DELSETELEM:
5214 te = (struct nft_trans_elem *)trans->data;
5216 nf_tables_setelem_notify(&trans->ctx, te->set,
5218 NFT_MSG_DELSETELEM, 0);
5219 te->set->ops->remove(net, te->set, &te->elem);
5220 atomic_dec(&te->set->nelems);
5223 case NFT_MSG_NEWOBJ:
5224 nft_clear(net, nft_trans_obj(trans));
5225 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
5227 nft_trans_destroy(trans);
5229 case NFT_MSG_DELOBJ:
5230 list_del_rcu(&nft_trans_obj(trans)->list);
5231 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
5239 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
5240 list_del(&trans->list);
5241 nf_tables_commit_release(trans);
5244 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
5249 static void nf_tables_abort_release(struct nft_trans *trans)
5251 switch (trans->msg_type) {
5252 case NFT_MSG_NEWTABLE:
5253 nf_tables_table_destroy(&trans->ctx);
5255 case NFT_MSG_NEWCHAIN:
5256 nf_tables_chain_destroy(trans->ctx.chain);
5258 case NFT_MSG_NEWRULE:
5259 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
5261 case NFT_MSG_NEWSET:
5262 nft_set_destroy(nft_trans_set(trans));
5264 case NFT_MSG_NEWSETELEM:
5265 nft_set_elem_destroy(nft_trans_elem_set(trans),
5266 nft_trans_elem(trans).priv, true);
5268 case NFT_MSG_NEWOBJ:
5269 nft_obj_destroy(nft_trans_obj(trans));
5275 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
5277 struct nft_trans *trans, *next;
5278 struct nft_trans_elem *te;
5280 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
5282 switch (trans->msg_type) {
5283 case NFT_MSG_NEWTABLE:
5284 if (nft_trans_table_update(trans)) {
5285 if (nft_trans_table_enable(trans)) {
5286 nf_tables_table_disable(net,
5289 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
5291 nft_trans_destroy(trans);
5293 list_del_rcu(&trans->ctx.table->list);
5296 case NFT_MSG_DELTABLE:
5297 nft_clear(trans->ctx.net, trans->ctx.table);
5298 nft_trans_destroy(trans);
5300 case NFT_MSG_NEWCHAIN:
5301 if (nft_trans_chain_update(trans)) {
5302 free_percpu(nft_trans_chain_stats(trans));
5303 kfree(nft_trans_chain_name(trans));
5304 nft_trans_destroy(trans);
5306 trans->ctx.table->use--;
5307 list_del_rcu(&trans->ctx.chain->list);
5308 nf_tables_unregister_hooks(trans->ctx.net,
5311 trans->ctx.afi->nops);
5314 case NFT_MSG_DELCHAIN:
5315 trans->ctx.table->use++;
5316 nft_clear(trans->ctx.net, trans->ctx.chain);
5317 nft_trans_destroy(trans);
5319 case NFT_MSG_NEWRULE:
5320 trans->ctx.chain->use--;
5321 list_del_rcu(&nft_trans_rule(trans)->list);
5322 nft_rule_expr_deactivate(&trans->ctx, nft_trans_rule(trans));
5324 case NFT_MSG_DELRULE:
5325 trans->ctx.chain->use++;
5326 nft_clear(trans->ctx.net, nft_trans_rule(trans));
5327 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
5328 nft_trans_destroy(trans);
5330 case NFT_MSG_NEWSET:
5331 trans->ctx.table->use--;
5332 list_del_rcu(&nft_trans_set(trans)->list);
5334 case NFT_MSG_DELSET:
5335 trans->ctx.table->use++;
5336 nft_clear(trans->ctx.net, nft_trans_set(trans));
5337 nft_trans_destroy(trans);
5339 case NFT_MSG_NEWSETELEM:
5340 te = (struct nft_trans_elem *)trans->data;
5342 te->set->ops->remove(net, te->set, &te->elem);
5343 atomic_dec(&te->set->nelems);
5345 case NFT_MSG_DELSETELEM:
5346 te = (struct nft_trans_elem *)trans->data;
5348 nft_set_elem_activate(net, te->set, &te->elem);
5349 te->set->ops->activate(net, te->set, &te->elem);
5352 nft_trans_destroy(trans);
5354 case NFT_MSG_NEWOBJ:
5355 trans->ctx.table->use--;
5356 list_del_rcu(&nft_trans_obj(trans)->list);
5358 case NFT_MSG_DELOBJ:
5359 trans->ctx.table->use++;
5360 nft_clear(trans->ctx.net, nft_trans_obj(trans));
5361 nft_trans_destroy(trans);
5368 list_for_each_entry_safe_reverse(trans, next,
5369 &net->nft.commit_list, list) {
5370 list_del(&trans->list);
5371 nf_tables_abort_release(trans);
5377 static bool nf_tables_valid_genid(struct net *net, u32 genid)
5379 return net->nft.base_seq == genid;
5382 static const struct nfnetlink_subsystem nf_tables_subsys = {
5383 .name = "nf_tables",
5384 .subsys_id = NFNL_SUBSYS_NFTABLES,
5385 .cb_count = NFT_MSG_MAX,
5387 .commit = nf_tables_commit,
5388 .abort = nf_tables_abort,
5389 .valid_genid = nf_tables_valid_genid,
5392 int nft_chain_validate_dependency(const struct nft_chain *chain,
5393 enum nft_chain_type type)
5395 const struct nft_base_chain *basechain;
5397 if (nft_is_base_chain(chain)) {
5398 basechain = nft_base_chain(chain);
5399 if (basechain->type->type != type)
5404 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
5406 int nft_chain_validate_hooks(const struct nft_chain *chain,
5407 unsigned int hook_flags)
5409 struct nft_base_chain *basechain;
5411 if (nft_is_base_chain(chain)) {
5412 basechain = nft_base_chain(chain);
5414 if ((1 << basechain->ops[0].hooknum) & hook_flags)
5422 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
5425 * Loop detection - walk through the ruleset beginning at the destination chain
5426 * of a new jump until either the source chain is reached (loop) or all
5427 * reachable chains have been traversed.
5429 * The loop check is performed whenever a new jump verdict is added to an
5430 * expression or verdict map or a verdict map is bound to a new chain.
5433 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5434 const struct nft_chain *chain);
5436 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
5437 struct nft_set *set,
5438 const struct nft_set_iter *iter,
5439 struct nft_set_elem *elem)
5441 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5442 const struct nft_data *data;
5444 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5445 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
5448 data = nft_set_ext_data(ext);
5449 switch (data->verdict.code) {
5452 return nf_tables_check_loops(ctx, data->verdict.chain);
5458 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5459 const struct nft_chain *chain)
5461 const struct nft_rule *rule;
5462 const struct nft_expr *expr, *last;
5463 struct nft_set *set;
5464 struct nft_set_binding *binding;
5465 struct nft_set_iter iter;
5467 if (ctx->chain == chain)
5470 list_for_each_entry(rule, &chain->rules, list) {
5471 nft_rule_for_each_expr(expr, last, rule) {
5472 const struct nft_data *data = NULL;
5475 if (!expr->ops->validate)
5478 err = expr->ops->validate(ctx, expr, &data);
5485 switch (data->verdict.code) {
5488 err = nf_tables_check_loops(ctx,
5489 data->verdict.chain);
5498 list_for_each_entry(set, &ctx->table->sets, list) {
5499 if (!nft_is_active_next(ctx->net, set))
5501 if (!(set->flags & NFT_SET_MAP) ||
5502 set->dtype != NFT_DATA_VERDICT)
5505 list_for_each_entry(binding, &set->bindings, list) {
5506 if (!(binding->flags & NFT_SET_MAP) ||
5507 binding->chain != chain)
5510 iter.genmask = nft_genmask_next(ctx->net);
5514 iter.fn = nf_tables_loop_check_setelem;
5516 set->ops->walk(ctx, set, &iter);
5526 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
5528 * @attr: netlink attribute to fetch value from
5529 * @max: maximum value to be stored in dest
5530 * @dest: pointer to the variable
5532 * Parse, check and store a given u32 netlink attribute into variable.
5533 * This function returns -ERANGE if the value goes over maximum value.
5534 * Otherwise a 0 is returned and the attribute value is stored in the
5535 * destination variable.
5537 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
5541 val = ntohl(nla_get_be32(attr));
5548 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
5551 * nft_parse_register - parse a register value from a netlink attribute
5553 * @attr: netlink attribute
5555 * Parse and translate a register value from a netlink attribute.
5556 * Registers used to be 128 bit wide, these register numbers will be
5557 * mapped to the corresponding 32 bit register numbers.
5559 unsigned int nft_parse_register(const struct nlattr *attr)
5563 reg = ntohl(nla_get_be32(attr));
5565 case NFT_REG_VERDICT...NFT_REG_4:
5566 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
5568 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
5571 EXPORT_SYMBOL_GPL(nft_parse_register);
5574 * nft_dump_register - dump a register value to a netlink attribute
5576 * @skb: socket buffer
5577 * @attr: attribute number
5578 * @reg: register number
5580 * Construct a netlink attribute containing the register number. For
5581 * compatibility reasons, register numbers being a multiple of 4 are
5582 * translated to the corresponding 128 bit register numbers.
5584 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
5586 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
5587 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
5589 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
5591 return nla_put_be32(skb, attr, htonl(reg));
5593 EXPORT_SYMBOL_GPL(nft_dump_register);
5596 * nft_validate_register_load - validate a load from a register
5598 * @reg: the register number
5599 * @len: the length of the data
5601 * Validate that the input register is one of the general purpose
5602 * registers and that the length of the load is within the bounds.
5604 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
5606 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5610 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
5615 EXPORT_SYMBOL_GPL(nft_validate_register_load);
5618 * nft_validate_register_store - validate an expressions' register store
5620 * @ctx: context of the expression performing the load
5621 * @reg: the destination register number
5622 * @data: the data to load
5623 * @type: the data type
5624 * @len: the length of the data
5626 * Validate that a data load uses the appropriate data type for
5627 * the destination register and the length is within the bounds.
5628 * A value of NULL for the data means that its runtime gathered
5631 int nft_validate_register_store(const struct nft_ctx *ctx,
5632 enum nft_registers reg,
5633 const struct nft_data *data,
5634 enum nft_data_types type, unsigned int len)
5639 case NFT_REG_VERDICT:
5640 if (type != NFT_DATA_VERDICT)
5644 (data->verdict.code == NFT_GOTO ||
5645 data->verdict.code == NFT_JUMP)) {
5646 err = nf_tables_check_loops(ctx, data->verdict.chain);
5650 if (ctx->chain->level + 1 >
5651 data->verdict.chain->level) {
5652 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
5654 data->verdict.chain->level = ctx->chain->level + 1;
5660 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5664 if (reg * NFT_REG32_SIZE + len >
5665 FIELD_SIZEOF(struct nft_regs, data))
5668 if (data != NULL && type != NFT_DATA_VALUE)
5673 EXPORT_SYMBOL_GPL(nft_validate_register_store);
5675 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
5676 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
5677 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
5678 .len = NFT_CHAIN_MAXNAMELEN - 1 },
5681 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
5682 struct nft_data_desc *desc, const struct nlattr *nla)
5684 u8 genmask = nft_genmask_next(ctx->net);
5685 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
5686 struct nft_chain *chain;
5689 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
5694 if (!tb[NFTA_VERDICT_CODE])
5696 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
5698 switch (data->verdict.code) {
5700 switch (data->verdict.code & NF_VERDICT_MASK) {
5715 if (!tb[NFTA_VERDICT_CHAIN])
5717 chain = nf_tables_chain_lookup(ctx->table,
5718 tb[NFTA_VERDICT_CHAIN], genmask);
5720 return PTR_ERR(chain);
5721 if (nft_is_base_chain(chain))
5725 data->verdict.chain = chain;
5729 desc->len = sizeof(data->verdict);
5730 desc->type = NFT_DATA_VERDICT;
5734 static void nft_verdict_uninit(const struct nft_data *data)
5736 switch (data->verdict.code) {
5739 data->verdict.chain->use--;
5744 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
5746 struct nlattr *nest;
5748 nest = nla_nest_start(skb, type);
5750 goto nla_put_failure;
5752 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
5753 goto nla_put_failure;
5758 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
5760 goto nla_put_failure;
5762 nla_nest_end(skb, nest);
5769 static int nft_value_init(const struct nft_ctx *ctx,
5770 struct nft_data *data, unsigned int size,
5771 struct nft_data_desc *desc, const struct nlattr *nla)
5781 nla_memcpy(data->data, nla, len);
5782 desc->type = NFT_DATA_VALUE;
5787 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
5790 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
5793 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
5794 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
5795 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
5799 * nft_data_init - parse nf_tables data netlink attributes
5801 * @ctx: context of the expression using the data
5802 * @data: destination struct nft_data
5803 * @size: maximum data length
5804 * @desc: data description
5805 * @nla: netlink attribute containing data
5807 * Parse the netlink data attributes and initialize a struct nft_data.
5808 * The type and length of data are returned in the data description.
5810 * The caller can indicate that it only wants to accept data of type
5811 * NFT_DATA_VALUE by passing NULL for the ctx argument.
5813 int nft_data_init(const struct nft_ctx *ctx,
5814 struct nft_data *data, unsigned int size,
5815 struct nft_data_desc *desc, const struct nlattr *nla)
5817 struct nlattr *tb[NFTA_DATA_MAX + 1];
5820 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
5824 if (tb[NFTA_DATA_VALUE])
5825 return nft_value_init(ctx, data, size, desc,
5826 tb[NFTA_DATA_VALUE]);
5827 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
5828 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
5831 EXPORT_SYMBOL_GPL(nft_data_init);
5834 * nft_data_release - release a nft_data item
5836 * @data: struct nft_data to release
5837 * @type: type of data
5839 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5840 * all others need to be released by calling this function.
5842 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
5844 if (type < NFT_DATA_VERDICT)
5847 case NFT_DATA_VERDICT:
5848 return nft_verdict_uninit(data);
5853 EXPORT_SYMBOL_GPL(nft_data_release);
5855 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
5856 enum nft_data_types type, unsigned int len)
5858 struct nlattr *nest;
5861 nest = nla_nest_start(skb, attr);
5866 case NFT_DATA_VALUE:
5867 err = nft_value_dump(skb, data, len);
5869 case NFT_DATA_VERDICT:
5870 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
5877 nla_nest_end(skb, nest);
5880 EXPORT_SYMBOL_GPL(nft_data_dump);
5882 static int __net_init nf_tables_init_net(struct net *net)
5884 INIT_LIST_HEAD(&net->nft.af_info);
5885 INIT_LIST_HEAD(&net->nft.commit_list);
5886 net->nft.base_seq = 1;
5890 int __nft_release_basechain(struct nft_ctx *ctx)
5892 struct nft_rule *rule, *nr;
5894 BUG_ON(!nft_is_base_chain(ctx->chain));
5896 nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
5898 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
5899 list_del(&rule->list);
5901 nf_tables_rule_release(ctx, rule);
5903 list_del(&ctx->chain->list);
5905 nf_tables_chain_destroy(ctx->chain);
5909 EXPORT_SYMBOL_GPL(__nft_release_basechain);
5911 /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
5912 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
5914 struct nft_table *table, *nt;
5915 struct nft_chain *chain, *nc;
5916 struct nft_object *obj, *ne;
5917 struct nft_rule *rule, *nr;
5918 struct nft_set *set, *ns;
5919 struct nft_ctx ctx = {
5924 list_for_each_entry_safe(table, nt, &afi->tables, list) {
5925 list_for_each_entry(chain, &table->chains, list)
5926 nf_tables_unregister_hooks(net, table, chain,
5928 /* No packets are walking on these chains anymore. */
5930 list_for_each_entry(chain, &table->chains, list) {
5932 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
5933 list_del(&rule->list);
5935 nf_tables_rule_release(&ctx, rule);
5938 list_for_each_entry_safe(set, ns, &table->sets, list) {
5939 list_del(&set->list);
5941 nft_set_destroy(set);
5943 list_for_each_entry_safe(obj, ne, &table->objects, list) {
5944 list_del(&obj->list);
5946 nft_obj_destroy(obj);
5948 list_for_each_entry_safe(chain, nc, &table->chains, list) {
5949 list_del(&chain->list);
5951 nf_tables_chain_destroy(chain);
5953 list_del(&table->list);
5954 nf_tables_table_destroy(&ctx);
5958 static struct pernet_operations nf_tables_net_ops = {
5959 .init = nf_tables_init_net,
5962 static int __init nf_tables_module_init(void)
5966 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
5973 err = nf_tables_core_module_init();
5977 err = nfnetlink_subsys_register(&nf_tables_subsys);
5981 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
5982 return register_pernet_subsys(&nf_tables_net_ops);
5984 nf_tables_core_module_exit();
5991 static void __exit nf_tables_module_exit(void)
5993 unregister_pernet_subsys(&nf_tables_net_ops);
5994 nfnetlink_subsys_unregister(&nf_tables_subsys);
5996 nf_tables_core_module_exit();
6000 module_init(nf_tables_module_init);
6001 module_exit(nf_tables_module_exit);
6003 MODULE_LICENSE("GPL");
6004 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
6005 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);