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/rhashtable.h>
18 #include <linux/netfilter.h>
19 #include <linux/netfilter/nfnetlink.h>
20 #include <linux/netfilter/nf_tables.h>
21 #include <net/netfilter/nf_flow_table.h>
22 #include <net/netfilter/nf_tables_core.h>
23 #include <net/netfilter/nf_tables.h>
24 #include <net/net_namespace.h>
27 static LIST_HEAD(nf_tables_expressions);
28 static LIST_HEAD(nf_tables_objects);
29 static LIST_HEAD(nf_tables_flowtables);
30 static LIST_HEAD(nf_tables_destroy_list);
31 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
32 static u64 table_handle;
35 NFT_VALIDATE_SKIP = 0,
40 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
41 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
42 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
44 static const struct rhashtable_params nft_chain_ht_params = {
45 .head_offset = offsetof(struct nft_chain, rhlhead),
46 .key_offset = offsetof(struct nft_chain, name),
47 .hashfn = nft_chain_hash,
48 .obj_hashfn = nft_chain_hash_obj,
49 .obj_cmpfn = nft_chain_hash_cmp,
51 .automatic_shrinking = true,
54 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
56 switch (net->nft.validate_state) {
57 case NFT_VALIDATE_SKIP:
58 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
60 case NFT_VALIDATE_NEED:
63 if (new_validate_state == NFT_VALIDATE_NEED)
67 net->nft.validate_state = new_validate_state;
69 static void nf_tables_trans_destroy_work(struct work_struct *w);
70 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
72 static void nft_ctx_init(struct nft_ctx *ctx,
74 const struct sk_buff *skb,
75 const struct nlmsghdr *nlh,
77 struct nft_table *table,
78 struct nft_chain *chain,
79 const struct nlattr * const *nla)
87 ctx->portid = NETLINK_CB(skb).portid;
88 ctx->report = nlmsg_report(nlh);
89 ctx->seq = nlh->nlmsg_seq;
92 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
93 int msg_type, u32 size, gfp_t gfp)
95 struct nft_trans *trans;
97 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
101 trans->msg_type = msg_type;
107 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
108 int msg_type, u32 size)
110 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
113 static void nft_trans_destroy(struct nft_trans *trans)
115 list_del(&trans->list);
119 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
121 struct net *net = ctx->net;
122 struct nft_trans *trans;
124 if (!nft_set_is_anonymous(set))
127 list_for_each_entry_reverse(trans, &net->nft.commit_list, list) {
128 if (trans->msg_type == NFT_MSG_NEWSET &&
129 nft_trans_set(trans) == set) {
130 nft_trans_set_bound(trans) = true;
136 static int nf_tables_register_hook(struct net *net,
137 const struct nft_table *table,
138 struct nft_chain *chain)
140 const struct nft_base_chain *basechain;
141 const struct nf_hook_ops *ops;
143 if (table->flags & NFT_TABLE_F_DORMANT ||
144 !nft_is_base_chain(chain))
147 basechain = nft_base_chain(chain);
148 ops = &basechain->ops;
150 if (basechain->type->ops_register)
151 return basechain->type->ops_register(net, ops);
153 return nf_register_net_hook(net, ops);
156 static void nf_tables_unregister_hook(struct net *net,
157 const struct nft_table *table,
158 struct nft_chain *chain)
160 const struct nft_base_chain *basechain;
161 const struct nf_hook_ops *ops;
163 if (table->flags & NFT_TABLE_F_DORMANT ||
164 !nft_is_base_chain(chain))
166 basechain = nft_base_chain(chain);
167 ops = &basechain->ops;
169 if (basechain->type->ops_unregister)
170 return basechain->type->ops_unregister(net, ops);
172 nf_unregister_net_hook(net, ops);
175 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
177 struct nft_trans *trans;
179 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
183 if (msg_type == NFT_MSG_NEWTABLE)
184 nft_activate_next(ctx->net, ctx->table);
186 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
190 static int nft_deltable(struct nft_ctx *ctx)
194 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
198 nft_deactivate_next(ctx->net, ctx->table);
202 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
204 struct nft_trans *trans;
206 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
210 if (msg_type == NFT_MSG_NEWCHAIN)
211 nft_activate_next(ctx->net, ctx->chain);
213 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
217 static int nft_delchain(struct nft_ctx *ctx)
221 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
226 nft_deactivate_next(ctx->net, ctx->chain);
231 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
232 struct nft_rule *rule)
234 struct nft_expr *expr;
236 expr = nft_expr_first(rule);
237 while (expr != nft_expr_last(rule) && expr->ops) {
238 if (expr->ops->activate)
239 expr->ops->activate(ctx, expr);
241 expr = nft_expr_next(expr);
245 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
246 struct nft_rule *rule,
247 enum nft_trans_phase phase)
249 struct nft_expr *expr;
251 expr = nft_expr_first(rule);
252 while (expr != nft_expr_last(rule) && expr->ops) {
253 if (expr->ops->deactivate)
254 expr->ops->deactivate(ctx, expr, phase);
256 expr = nft_expr_next(expr);
261 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
263 /* You cannot delete the same rule twice */
264 if (nft_is_active_next(ctx->net, rule)) {
265 nft_deactivate_next(ctx->net, rule);
272 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
273 struct nft_rule *rule)
275 struct nft_trans *trans;
277 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
281 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
282 nft_trans_rule_id(trans) =
283 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
285 nft_trans_rule(trans) = rule;
286 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
291 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
293 struct nft_trans *trans;
296 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
300 err = nf_tables_delrule_deactivate(ctx, rule);
302 nft_trans_destroy(trans);
305 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
310 static int nft_delrule_by_chain(struct nft_ctx *ctx)
312 struct nft_rule *rule;
315 list_for_each_entry(rule, &ctx->chain->rules, list) {
316 err = nft_delrule(ctx, rule);
323 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
326 struct nft_trans *trans;
328 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
332 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
333 nft_trans_set_id(trans) =
334 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
335 nft_activate_next(ctx->net, set);
337 nft_trans_set(trans) = set;
338 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
343 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
347 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
351 nft_deactivate_next(ctx->net, set);
357 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
358 struct nft_object *obj)
360 struct nft_trans *trans;
362 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
366 if (msg_type == NFT_MSG_NEWOBJ)
367 nft_activate_next(ctx->net, obj);
369 nft_trans_obj(trans) = obj;
370 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
375 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
379 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
383 nft_deactivate_next(ctx->net, obj);
389 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
390 struct nft_flowtable *flowtable)
392 struct nft_trans *trans;
394 trans = nft_trans_alloc(ctx, msg_type,
395 sizeof(struct nft_trans_flowtable));
399 if (msg_type == NFT_MSG_NEWFLOWTABLE)
400 nft_activate_next(ctx->net, flowtable);
402 nft_trans_flowtable(trans) = flowtable;
403 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
408 static int nft_delflowtable(struct nft_ctx *ctx,
409 struct nft_flowtable *flowtable)
413 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
417 nft_deactivate_next(ctx->net, flowtable);
427 static struct nft_table *nft_table_lookup(const struct net *net,
428 const struct nlattr *nla,
429 u8 family, u8 genmask)
431 struct nft_table *table;
434 return ERR_PTR(-EINVAL);
436 list_for_each_entry_rcu(table, &net->nft.tables, list) {
437 if (!nla_strcmp(nla, table->name) &&
438 table->family == family &&
439 nft_active_genmask(table, genmask))
443 return ERR_PTR(-ENOENT);
446 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
447 const struct nlattr *nla,
450 struct nft_table *table;
452 list_for_each_entry(table, &net->nft.tables, list) {
453 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
454 nft_active_genmask(table, genmask))
458 return ERR_PTR(-ENOENT);
461 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
463 return ++table->hgenerator;
466 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
468 static const struct nft_chain_type *
469 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
473 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
474 if (chain_type[family][i] != NULL &&
475 !nla_strcmp(nla, chain_type[family][i]->name))
476 return chain_type[family][i];
482 * Loading a module requires dropping mutex that guards the
484 * We first need to abort any pending transactions as once
485 * mutex is unlocked a different client could start a new
486 * transaction. It must not see any 'future generation'
487 * changes * as these changes will never happen.
489 #ifdef CONFIG_MODULES
490 static int __nf_tables_abort(struct net *net);
492 static void nft_request_module(struct net *net, const char *fmt, ...)
494 char module_name[MODULE_NAME_LEN];
498 __nf_tables_abort(net);
501 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
503 if (WARN(ret >= MODULE_NAME_LEN, "truncated: '%s' (len %d)", module_name, ret))
506 mutex_unlock(&net->nft.commit_mutex);
507 request_module("%s", module_name);
508 mutex_lock(&net->nft.commit_mutex);
512 static void lockdep_nfnl_nft_mutex_not_held(void)
514 #ifdef CONFIG_PROVE_LOCKING
515 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
519 static const struct nft_chain_type *
520 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
521 u8 family, bool autoload)
523 const struct nft_chain_type *type;
525 type = __nf_tables_chain_type_lookup(nla, family);
529 lockdep_nfnl_nft_mutex_not_held();
530 #ifdef CONFIG_MODULES
532 nft_request_module(net, "nft-chain-%u-%.*s", family,
533 nla_len(nla), (const char *)nla_data(nla));
534 type = __nf_tables_chain_type_lookup(nla, family);
536 return ERR_PTR(-EAGAIN);
539 return ERR_PTR(-ENOENT);
542 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
543 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
544 .len = NFT_TABLE_MAXNAMELEN - 1 },
545 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
546 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
549 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
550 u32 portid, u32 seq, int event, u32 flags,
551 int family, const struct nft_table *table)
553 struct nlmsghdr *nlh;
554 struct nfgenmsg *nfmsg;
556 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
557 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
559 goto nla_put_failure;
561 nfmsg = nlmsg_data(nlh);
562 nfmsg->nfgen_family = family;
563 nfmsg->version = NFNETLINK_V0;
564 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
566 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
567 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
568 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
569 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
571 goto nla_put_failure;
577 nlmsg_trim(skb, nlh);
581 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
587 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
590 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
594 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
595 event, 0, ctx->family, ctx->table);
601 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
602 ctx->report, GFP_KERNEL);
605 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
608 static int nf_tables_dump_tables(struct sk_buff *skb,
609 struct netlink_callback *cb)
611 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
612 const struct nft_table *table;
613 unsigned int idx = 0, s_idx = cb->args[0];
614 struct net *net = sock_net(skb->sk);
615 int family = nfmsg->nfgen_family;
618 cb->seq = net->nft.base_seq;
620 list_for_each_entry_rcu(table, &net->nft.tables, list) {
621 if (family != NFPROTO_UNSPEC && family != table->family)
627 memset(&cb->args[1], 0,
628 sizeof(cb->args) - sizeof(cb->args[0]));
629 if (!nft_is_active(net, table))
631 if (nf_tables_fill_table_info(skb, net,
632 NETLINK_CB(cb->skb).portid,
634 NFT_MSG_NEWTABLE, NLM_F_MULTI,
635 table->family, table) < 0)
638 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
648 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
649 const struct nlmsghdr *nlh,
650 struct netlink_dump_control *c)
654 if (!try_module_get(THIS_MODULE))
658 err = netlink_dump_start(nlsk, skb, nlh, c);
660 module_put(THIS_MODULE);
665 /* called with rcu_read_lock held */
666 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
667 struct sk_buff *skb, const struct nlmsghdr *nlh,
668 const struct nlattr * const nla[],
669 struct netlink_ext_ack *extack)
671 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
672 u8 genmask = nft_genmask_cur(net);
673 const struct nft_table *table;
674 struct sk_buff *skb2;
675 int family = nfmsg->nfgen_family;
678 if (nlh->nlmsg_flags & NLM_F_DUMP) {
679 struct netlink_dump_control c = {
680 .dump = nf_tables_dump_tables,
681 .module = THIS_MODULE,
684 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
687 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
689 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
690 return PTR_ERR(table);
693 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
697 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
698 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
703 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
710 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
712 struct nft_chain *chain;
715 list_for_each_entry(chain, &table->chains, list) {
716 if (!nft_is_active_next(net, chain))
718 if (!nft_is_base_chain(chain))
721 if (cnt && i++ == cnt)
724 nf_unregister_net_hook(net, &nft_base_chain(chain)->ops);
728 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
730 struct nft_chain *chain;
733 list_for_each_entry(chain, &table->chains, list) {
734 if (!nft_is_active_next(net, chain))
736 if (!nft_is_base_chain(chain))
739 err = nf_register_net_hook(net, &nft_base_chain(chain)->ops);
748 nft_table_disable(net, table, i);
752 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
754 nft_table_disable(net, table, 0);
757 static int nf_tables_updtable(struct nft_ctx *ctx)
759 struct nft_trans *trans;
763 if (!ctx->nla[NFTA_TABLE_FLAGS])
766 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
767 if (flags & ~NFT_TABLE_F_DORMANT)
770 if (flags == ctx->table->flags)
773 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
774 sizeof(struct nft_trans_table));
778 if ((flags & NFT_TABLE_F_DORMANT) &&
779 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
780 nft_trans_table_enable(trans) = false;
781 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
782 ctx->table->flags & NFT_TABLE_F_DORMANT) {
783 ret = nf_tables_table_enable(ctx->net, ctx->table);
785 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
786 nft_trans_table_enable(trans) = true;
792 nft_trans_table_update(trans) = true;
793 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
796 nft_trans_destroy(trans);
800 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
802 const char *name = data;
804 return jhash(name, strlen(name), seed);
807 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
809 const struct nft_chain *chain = data;
811 return nft_chain_hash(chain->name, 0, seed);
814 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
817 const struct nft_chain *chain = ptr;
818 const char *name = arg->key;
820 return strcmp(chain->name, name);
823 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
824 struct sk_buff *skb, const struct nlmsghdr *nlh,
825 const struct nlattr * const nla[],
826 struct netlink_ext_ack *extack)
828 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
829 u8 genmask = nft_genmask_next(net);
830 int family = nfmsg->nfgen_family;
831 const struct nlattr *attr;
832 struct nft_table *table;
837 lockdep_assert_held(&net->nft.commit_mutex);
838 attr = nla[NFTA_TABLE_NAME];
839 table = nft_table_lookup(net, attr, family, genmask);
841 if (PTR_ERR(table) != -ENOENT)
842 return PTR_ERR(table);
844 if (nlh->nlmsg_flags & NLM_F_EXCL) {
845 NL_SET_BAD_ATTR(extack, attr);
848 if (nlh->nlmsg_flags & NLM_F_REPLACE)
851 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
852 return nf_tables_updtable(&ctx);
855 if (nla[NFTA_TABLE_FLAGS]) {
856 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
857 if (flags & ~NFT_TABLE_F_DORMANT)
862 table = kzalloc(sizeof(*table), GFP_KERNEL);
866 table->name = nla_strdup(attr, GFP_KERNEL);
867 if (table->name == NULL)
870 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
874 INIT_LIST_HEAD(&table->chains);
875 INIT_LIST_HEAD(&table->sets);
876 INIT_LIST_HEAD(&table->objects);
877 INIT_LIST_HEAD(&table->flowtables);
878 table->family = family;
879 table->flags = flags;
880 table->handle = ++table_handle;
882 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
883 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
887 list_add_tail_rcu(&table->list, &net->nft.tables);
890 rhltable_destroy(&table->chains_ht);
899 static int nft_flush_table(struct nft_ctx *ctx)
901 struct nft_flowtable *flowtable, *nft;
902 struct nft_chain *chain, *nc;
903 struct nft_object *obj, *ne;
904 struct nft_set *set, *ns;
907 list_for_each_entry(chain, &ctx->table->chains, list) {
908 if (!nft_is_active_next(ctx->net, chain))
913 err = nft_delrule_by_chain(ctx);
918 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
919 if (!nft_is_active_next(ctx->net, set))
922 if (nft_set_is_anonymous(set) &&
923 !list_empty(&set->bindings))
926 err = nft_delset(ctx, set);
931 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
932 err = nft_delflowtable(ctx, flowtable);
937 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
938 err = nft_delobj(ctx, obj);
943 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
944 if (!nft_is_active_next(ctx->net, chain))
949 err = nft_delchain(ctx);
954 err = nft_deltable(ctx);
959 static int nft_flush(struct nft_ctx *ctx, int family)
961 struct nft_table *table, *nt;
962 const struct nlattr * const *nla = ctx->nla;
965 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
966 if (family != AF_UNSPEC && table->family != family)
969 ctx->family = table->family;
971 if (!nft_is_active_next(ctx->net, table))
974 if (nla[NFTA_TABLE_NAME] &&
975 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
980 err = nft_flush_table(ctx);
988 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
989 struct sk_buff *skb, const struct nlmsghdr *nlh,
990 const struct nlattr * const nla[],
991 struct netlink_ext_ack *extack)
993 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
994 u8 genmask = nft_genmask_next(net);
995 int family = nfmsg->nfgen_family;
996 const struct nlattr *attr;
997 struct nft_table *table;
1000 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
1001 if (family == AF_UNSPEC ||
1002 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1003 return nft_flush(&ctx, family);
1005 if (nla[NFTA_TABLE_HANDLE]) {
1006 attr = nla[NFTA_TABLE_HANDLE];
1007 table = nft_table_lookup_byhandle(net, attr, genmask);
1009 attr = nla[NFTA_TABLE_NAME];
1010 table = nft_table_lookup(net, attr, family, genmask);
1013 if (IS_ERR(table)) {
1014 NL_SET_BAD_ATTR(extack, attr);
1015 return PTR_ERR(table);
1018 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1022 ctx.family = family;
1025 return nft_flush_table(&ctx);
1028 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1030 if (WARN_ON(ctx->table->use > 0))
1033 rhltable_destroy(&ctx->table->chains_ht);
1034 kfree(ctx->table->name);
1038 void nft_register_chain_type(const struct nft_chain_type *ctype)
1040 if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO))
1043 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1044 if (WARN_ON(chain_type[ctype->family][ctype->type] != NULL)) {
1045 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1048 chain_type[ctype->family][ctype->type] = ctype;
1049 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1051 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1053 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1055 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1056 chain_type[ctype->family][ctype->type] = NULL;
1057 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1059 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1065 static struct nft_chain *
1066 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1068 struct nft_chain *chain;
1070 list_for_each_entry(chain, &table->chains, list) {
1071 if (chain->handle == handle &&
1072 nft_active_genmask(chain, genmask))
1076 return ERR_PTR(-ENOENT);
1079 static bool lockdep_commit_lock_is_held(struct net *net)
1081 #ifdef CONFIG_PROVE_LOCKING
1082 return lockdep_is_held(&net->nft.commit_mutex);
1088 static struct nft_chain *nft_chain_lookup(struct net *net,
1089 struct nft_table *table,
1090 const struct nlattr *nla, u8 genmask)
1092 char search[NFT_CHAIN_MAXNAMELEN + 1];
1093 struct rhlist_head *tmp, *list;
1094 struct nft_chain *chain;
1097 return ERR_PTR(-EINVAL);
1099 nla_strlcpy(search, nla, sizeof(search));
1101 WARN_ON(!rcu_read_lock_held() &&
1102 !lockdep_commit_lock_is_held(net));
1104 chain = ERR_PTR(-ENOENT);
1106 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1110 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1111 if (nft_active_genmask(chain, genmask))
1114 chain = ERR_PTR(-ENOENT);
1120 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1121 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1122 .len = NFT_TABLE_MAXNAMELEN - 1 },
1123 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1124 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1125 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1126 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1127 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1128 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
1129 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1132 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1133 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1134 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1135 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1136 .len = IFNAMSIZ - 1 },
1139 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1141 struct nft_stats *cpu_stats, total;
1142 struct nlattr *nest;
1147 memset(&total, 0, sizeof(total));
1148 for_each_possible_cpu(cpu) {
1149 cpu_stats = per_cpu_ptr(stats, cpu);
1151 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1152 pkts = cpu_stats->pkts;
1153 bytes = cpu_stats->bytes;
1154 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1156 total.bytes += bytes;
1158 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
1160 goto nla_put_failure;
1162 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1163 NFTA_COUNTER_PAD) ||
1164 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1166 goto nla_put_failure;
1168 nla_nest_end(skb, nest);
1175 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1176 u32 portid, u32 seq, int event, u32 flags,
1177 int family, const struct nft_table *table,
1178 const struct nft_chain *chain)
1180 struct nlmsghdr *nlh;
1181 struct nfgenmsg *nfmsg;
1183 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1184 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1186 goto nla_put_failure;
1188 nfmsg = nlmsg_data(nlh);
1189 nfmsg->nfgen_family = family;
1190 nfmsg->version = NFNETLINK_V0;
1191 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1193 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1194 goto nla_put_failure;
1195 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1197 goto nla_put_failure;
1198 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1199 goto nla_put_failure;
1201 if (nft_is_base_chain(chain)) {
1202 const struct nft_base_chain *basechain = nft_base_chain(chain);
1203 const struct nf_hook_ops *ops = &basechain->ops;
1204 struct nlattr *nest;
1206 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
1208 goto nla_put_failure;
1209 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1210 goto nla_put_failure;
1211 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1212 goto nla_put_failure;
1213 if (basechain->dev_name[0] &&
1214 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1215 goto nla_put_failure;
1216 nla_nest_end(skb, nest);
1218 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1219 htonl(basechain->policy)))
1220 goto nla_put_failure;
1222 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1223 goto nla_put_failure;
1225 if (rcu_access_pointer(basechain->stats) &&
1226 nft_dump_stats(skb, rcu_dereference(basechain->stats)))
1227 goto nla_put_failure;
1230 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1231 goto nla_put_failure;
1233 nlmsg_end(skb, nlh);
1237 nlmsg_trim(skb, nlh);
1241 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1243 struct sk_buff *skb;
1247 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1250 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1254 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1255 event, 0, ctx->family, ctx->table,
1262 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1263 ctx->report, GFP_KERNEL);
1266 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1269 static int nf_tables_dump_chains(struct sk_buff *skb,
1270 struct netlink_callback *cb)
1272 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1273 const struct nft_table *table;
1274 const struct nft_chain *chain;
1275 unsigned int idx = 0, s_idx = cb->args[0];
1276 struct net *net = sock_net(skb->sk);
1277 int family = nfmsg->nfgen_family;
1280 cb->seq = net->nft.base_seq;
1282 list_for_each_entry_rcu(table, &net->nft.tables, list) {
1283 if (family != NFPROTO_UNSPEC && family != table->family)
1286 list_for_each_entry_rcu(chain, &table->chains, list) {
1290 memset(&cb->args[1], 0,
1291 sizeof(cb->args) - sizeof(cb->args[0]));
1292 if (!nft_is_active(net, chain))
1294 if (nf_tables_fill_chain_info(skb, net,
1295 NETLINK_CB(cb->skb).portid,
1299 table->family, table,
1303 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1314 /* called with rcu_read_lock held */
1315 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1316 struct sk_buff *skb, const struct nlmsghdr *nlh,
1317 const struct nlattr * const nla[],
1318 struct netlink_ext_ack *extack)
1320 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1321 u8 genmask = nft_genmask_cur(net);
1322 const struct nft_chain *chain;
1323 struct nft_table *table;
1324 struct sk_buff *skb2;
1325 int family = nfmsg->nfgen_family;
1328 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1329 struct netlink_dump_control c = {
1330 .dump = nf_tables_dump_chains,
1331 .module = THIS_MODULE,
1334 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1337 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1338 if (IS_ERR(table)) {
1339 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1340 return PTR_ERR(table);
1343 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1344 if (IS_ERR(chain)) {
1345 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1346 return PTR_ERR(chain);
1349 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1353 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1354 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1355 family, table, chain);
1359 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1366 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1367 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1368 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1371 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1373 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1374 struct nft_stats __percpu *newstats;
1375 struct nft_stats *stats;
1378 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy,
1381 return ERR_PTR(err);
1383 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1384 return ERR_PTR(-EINVAL);
1386 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1387 if (newstats == NULL)
1388 return ERR_PTR(-ENOMEM);
1390 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1391 * are not exposed to userspace.
1394 stats = this_cpu_ptr(newstats);
1395 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1396 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1402 static void nft_chain_stats_replace(struct net *net,
1403 struct nft_base_chain *chain,
1404 struct nft_stats __percpu *newstats)
1406 struct nft_stats __percpu *oldstats;
1408 if (newstats == NULL)
1411 if (rcu_access_pointer(chain->stats)) {
1412 oldstats = rcu_dereference_protected(chain->stats,
1413 lockdep_commit_lock_is_held(net));
1414 rcu_assign_pointer(chain->stats, newstats);
1416 free_percpu(oldstats);
1418 rcu_assign_pointer(chain->stats, newstats);
1419 static_branch_inc(&nft_counters_enabled);
1423 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1425 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1426 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1432 /* should be NULL either via abort or via successful commit */
1433 WARN_ON_ONCE(chain->rules_next);
1434 kvfree(chain->rules_next);
1437 static void nf_tables_chain_destroy(struct nft_ctx *ctx)
1439 struct nft_chain *chain = ctx->chain;
1441 if (WARN_ON(chain->use > 0))
1444 /* no concurrent access possible anymore */
1445 nf_tables_chain_free_chain_rules(chain);
1447 if (nft_is_base_chain(chain)) {
1448 struct nft_base_chain *basechain = nft_base_chain(chain);
1450 module_put(basechain->type->owner);
1451 if (rcu_access_pointer(basechain->stats)) {
1452 static_branch_dec(&nft_counters_enabled);
1453 free_percpu(rcu_dereference_raw(basechain->stats));
1463 struct nft_chain_hook {
1466 const struct nft_chain_type *type;
1467 struct net_device *dev;
1470 static int nft_chain_parse_hook(struct net *net,
1471 const struct nlattr * const nla[],
1472 struct nft_chain_hook *hook, u8 family,
1475 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1476 const struct nft_chain_type *type;
1477 struct net_device *dev;
1480 lockdep_assert_held(&net->nft.commit_mutex);
1481 lockdep_nfnl_nft_mutex_not_held();
1483 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1484 nft_hook_policy, NULL);
1488 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1489 ha[NFTA_HOOK_PRIORITY] == NULL)
1492 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1493 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1495 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1496 if (nla[NFTA_CHAIN_TYPE]) {
1497 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1500 return PTR_ERR(type);
1502 if (!(type->hook_mask & (1 << hook->num)))
1505 if (type->type == NFT_CHAIN_T_NAT &&
1506 hook->priority <= NF_IP_PRI_CONNTRACK)
1509 if (!try_module_get(type->owner))
1515 if (family == NFPROTO_NETDEV) {
1516 char ifname[IFNAMSIZ];
1518 if (!ha[NFTA_HOOK_DEV]) {
1519 module_put(type->owner);
1523 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1524 dev = __dev_get_by_name(net, ifname);
1526 module_put(type->owner);
1530 } else if (ha[NFTA_HOOK_DEV]) {
1531 module_put(type->owner);
1538 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1540 module_put(hook->type->owner);
1543 struct nft_rules_old {
1545 struct nft_rule **start;
1548 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1551 if (alloc > INT_MAX)
1554 alloc += 1; /* NULL, ends rules */
1555 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1558 alloc *= sizeof(struct nft_rule *);
1559 alloc += sizeof(struct nft_rules_old);
1561 return kvmalloc(alloc, GFP_KERNEL);
1564 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1567 const struct nlattr * const *nla = ctx->nla;
1568 struct nft_table *table = ctx->table;
1569 struct nft_base_chain *basechain;
1570 struct nft_stats __percpu *stats;
1571 struct net *net = ctx->net;
1572 struct nft_chain *chain;
1573 struct nft_rule **rules;
1576 if (table->use == UINT_MAX)
1579 if (nla[NFTA_CHAIN_HOOK]) {
1580 struct nft_chain_hook hook;
1581 struct nf_hook_ops *ops;
1583 err = nft_chain_parse_hook(net, nla, &hook, family, true);
1587 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1588 if (basechain == NULL) {
1589 nft_chain_release_hook(&hook);
1593 if (hook.dev != NULL)
1594 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1596 if (nla[NFTA_CHAIN_COUNTERS]) {
1597 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1598 if (IS_ERR(stats)) {
1599 nft_chain_release_hook(&hook);
1601 return PTR_ERR(stats);
1603 rcu_assign_pointer(basechain->stats, stats);
1604 static_branch_inc(&nft_counters_enabled);
1607 basechain->type = hook.type;
1608 chain = &basechain->chain;
1610 ops = &basechain->ops;
1612 ops->hooknum = hook.num;
1613 ops->priority = hook.priority;
1615 ops->hook = hook.type->hooks[ops->hooknum];
1616 ops->dev = hook.dev;
1618 chain->flags |= NFT_BASE_CHAIN;
1619 basechain->policy = policy;
1621 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1627 INIT_LIST_HEAD(&chain->rules);
1628 chain->handle = nf_tables_alloc_handle(table);
1629 chain->table = table;
1630 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1636 rules = nf_tables_chain_alloc_rules(chain, 0);
1643 rcu_assign_pointer(chain->rules_gen_0, rules);
1644 rcu_assign_pointer(chain->rules_gen_1, rules);
1646 err = nf_tables_register_hook(net, table, chain);
1650 err = rhltable_insert_key(&table->chains_ht, chain->name,
1651 &chain->rhlhead, nft_chain_ht_params);
1655 err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1657 rhltable_remove(&table->chains_ht, &chain->rhlhead,
1658 nft_chain_ht_params);
1663 list_add_tail_rcu(&chain->list, &table->chains);
1667 nf_tables_unregister_hook(net, table, chain);
1669 nf_tables_chain_destroy(ctx);
1674 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy)
1676 const struct nlattr * const *nla = ctx->nla;
1677 struct nft_table *table = ctx->table;
1678 struct nft_chain *chain = ctx->chain;
1679 struct nft_base_chain *basechain;
1680 struct nft_stats *stats = NULL;
1681 struct nft_chain_hook hook;
1682 struct nf_hook_ops *ops;
1683 struct nft_trans *trans;
1686 if (nla[NFTA_CHAIN_HOOK]) {
1687 if (!nft_is_base_chain(chain))
1690 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
1695 basechain = nft_base_chain(chain);
1696 if (basechain->type != hook.type) {
1697 nft_chain_release_hook(&hook);
1701 ops = &basechain->ops;
1702 if (ops->hooknum != hook.num ||
1703 ops->priority != hook.priority ||
1704 ops->dev != hook.dev) {
1705 nft_chain_release_hook(&hook);
1708 nft_chain_release_hook(&hook);
1711 if (nla[NFTA_CHAIN_HANDLE] &&
1712 nla[NFTA_CHAIN_NAME]) {
1713 struct nft_chain *chain2;
1715 chain2 = nft_chain_lookup(ctx->net, table,
1716 nla[NFTA_CHAIN_NAME], genmask);
1717 if (!IS_ERR(chain2))
1721 if (nla[NFTA_CHAIN_COUNTERS]) {
1722 if (!nft_is_base_chain(chain))
1725 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1727 return PTR_ERR(stats);
1731 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
1732 sizeof(struct nft_trans_chain));
1736 nft_trans_chain_stats(trans) = stats;
1737 nft_trans_chain_update(trans) = true;
1739 if (nla[NFTA_CHAIN_POLICY])
1740 nft_trans_chain_policy(trans) = policy;
1742 nft_trans_chain_policy(trans) = -1;
1744 if (nla[NFTA_CHAIN_HANDLE] &&
1745 nla[NFTA_CHAIN_NAME]) {
1746 struct nft_trans *tmp;
1750 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1755 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
1756 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
1757 tmp->ctx.table == table &&
1758 nft_trans_chain_update(tmp) &&
1759 nft_trans_chain_name(tmp) &&
1760 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
1766 nft_trans_chain_name(trans) = name;
1768 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1777 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1778 struct sk_buff *skb, const struct nlmsghdr *nlh,
1779 const struct nlattr * const nla[],
1780 struct netlink_ext_ack *extack)
1782 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1783 u8 genmask = nft_genmask_next(net);
1784 int family = nfmsg->nfgen_family;
1785 const struct nlattr *attr;
1786 struct nft_table *table;
1787 struct nft_chain *chain;
1788 u8 policy = NF_ACCEPT;
1792 lockdep_assert_held(&net->nft.commit_mutex);
1794 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1795 if (IS_ERR(table)) {
1796 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1797 return PTR_ERR(table);
1801 attr = nla[NFTA_CHAIN_NAME];
1803 if (nla[NFTA_CHAIN_HANDLE]) {
1804 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1805 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1806 if (IS_ERR(chain)) {
1807 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
1808 return PTR_ERR(chain);
1810 attr = nla[NFTA_CHAIN_HANDLE];
1812 chain = nft_chain_lookup(net, table, attr, genmask);
1813 if (IS_ERR(chain)) {
1814 if (PTR_ERR(chain) != -ENOENT) {
1815 NL_SET_BAD_ATTR(extack, attr);
1816 return PTR_ERR(chain);
1822 if (nla[NFTA_CHAIN_POLICY]) {
1823 if (chain != NULL &&
1824 !nft_is_base_chain(chain)) {
1825 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1829 if (chain == NULL &&
1830 nla[NFTA_CHAIN_HOOK] == NULL) {
1831 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1835 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1845 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1847 if (chain != NULL) {
1848 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1849 NL_SET_BAD_ATTR(extack, attr);
1852 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1855 return nf_tables_updchain(&ctx, genmask, policy);
1858 return nf_tables_addchain(&ctx, family, genmask, policy);
1861 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1862 struct sk_buff *skb, const struct nlmsghdr *nlh,
1863 const struct nlattr * const nla[],
1864 struct netlink_ext_ack *extack)
1866 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1867 u8 genmask = nft_genmask_next(net);
1868 int family = nfmsg->nfgen_family;
1869 const struct nlattr *attr;
1870 struct nft_table *table;
1871 struct nft_chain *chain;
1872 struct nft_rule *rule;
1878 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1879 if (IS_ERR(table)) {
1880 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1881 return PTR_ERR(table);
1884 if (nla[NFTA_CHAIN_HANDLE]) {
1885 attr = nla[NFTA_CHAIN_HANDLE];
1886 handle = be64_to_cpu(nla_get_be64(attr));
1887 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1889 attr = nla[NFTA_CHAIN_NAME];
1890 chain = nft_chain_lookup(net, table, attr, genmask);
1892 if (IS_ERR(chain)) {
1893 NL_SET_BAD_ATTR(extack, attr);
1894 return PTR_ERR(chain);
1897 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1901 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1904 list_for_each_entry(rule, &chain->rules, list) {
1905 if (!nft_is_active_next(net, rule))
1909 err = nft_delrule(&ctx, rule);
1914 /* There are rules and elements that are still holding references to us,
1915 * we cannot do a recursive removal in this case.
1918 NL_SET_BAD_ATTR(extack, attr);
1922 return nft_delchain(&ctx);
1930 * nft_register_expr - register nf_tables expr type
1933 * Registers the expr type for use with nf_tables. Returns zero on
1934 * success or a negative errno code otherwise.
1936 int nft_register_expr(struct nft_expr_type *type)
1938 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1939 if (type->family == NFPROTO_UNSPEC)
1940 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1942 list_add_rcu(&type->list, &nf_tables_expressions);
1943 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1946 EXPORT_SYMBOL_GPL(nft_register_expr);
1949 * nft_unregister_expr - unregister nf_tables expr type
1952 * Unregisters the expr typefor use with nf_tables.
1954 void nft_unregister_expr(struct nft_expr_type *type)
1956 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1957 list_del_rcu(&type->list);
1958 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1960 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1962 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1965 const struct nft_expr_type *type;
1967 list_for_each_entry(type, &nf_tables_expressions, list) {
1968 if (!nla_strcmp(nla, type->name) &&
1969 (!type->family || type->family == family))
1975 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
1979 const struct nft_expr_type *type;
1982 return ERR_PTR(-EINVAL);
1984 type = __nft_expr_type_get(family, nla);
1985 if (type != NULL && try_module_get(type->owner))
1988 lockdep_nfnl_nft_mutex_not_held();
1989 #ifdef CONFIG_MODULES
1991 nft_request_module(net, "nft-expr-%u-%.*s", family,
1992 nla_len(nla), (char *)nla_data(nla));
1993 if (__nft_expr_type_get(family, nla))
1994 return ERR_PTR(-EAGAIN);
1996 nft_request_module(net, "nft-expr-%.*s",
1997 nla_len(nla), (char *)nla_data(nla));
1998 if (__nft_expr_type_get(family, nla))
1999 return ERR_PTR(-EAGAIN);
2002 return ERR_PTR(-ENOENT);
2005 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2006 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
2007 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2010 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2011 const struct nft_expr *expr)
2013 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2014 goto nla_put_failure;
2016 if (expr->ops->dump) {
2017 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
2019 goto nla_put_failure;
2020 if (expr->ops->dump(skb, expr) < 0)
2021 goto nla_put_failure;
2022 nla_nest_end(skb, data);
2031 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2032 const struct nft_expr *expr)
2034 struct nlattr *nest;
2036 nest = nla_nest_start(skb, attr);
2038 goto nla_put_failure;
2039 if (nf_tables_fill_expr_info(skb, expr) < 0)
2040 goto nla_put_failure;
2041 nla_nest_end(skb, nest);
2048 struct nft_expr_info {
2049 const struct nft_expr_ops *ops;
2050 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2053 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2054 const struct nlattr *nla,
2055 struct nft_expr_info *info)
2057 const struct nft_expr_type *type;
2058 const struct nft_expr_ops *ops;
2059 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2062 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL);
2066 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2068 return PTR_ERR(type);
2070 if (tb[NFTA_EXPR_DATA]) {
2071 err = nla_parse_nested(info->tb, type->maxattr,
2072 tb[NFTA_EXPR_DATA], type->policy, NULL);
2076 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2078 if (type->select_ops != NULL) {
2079 ops = type->select_ops(ctx,
2080 (const struct nlattr * const *)info->tb);
2092 module_put(type->owner);
2096 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2097 const struct nft_expr_info *info,
2098 struct nft_expr *expr)
2100 const struct nft_expr_ops *ops = info->ops;
2105 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2116 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2117 struct nft_expr *expr)
2119 if (expr->ops->destroy)
2120 expr->ops->destroy(ctx, expr);
2121 module_put(expr->ops->type->owner);
2124 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2125 const struct nlattr *nla)
2127 struct nft_expr_info info;
2128 struct nft_expr *expr;
2131 err = nf_tables_expr_parse(ctx, nla, &info);
2136 expr = kzalloc(info.ops->size, GFP_KERNEL);
2140 err = nf_tables_newexpr(ctx, &info, expr);
2148 module_put(info.ops->type->owner);
2150 return ERR_PTR(err);
2153 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2155 nf_tables_expr_destroy(ctx, expr);
2163 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2166 struct nft_rule *rule;
2168 // FIXME: this sucks
2169 list_for_each_entry_rcu(rule, &chain->rules, list) {
2170 if (handle == rule->handle)
2174 return ERR_PTR(-ENOENT);
2177 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2178 const struct nlattr *nla)
2181 return ERR_PTR(-EINVAL);
2183 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2186 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2187 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2188 .len = NFT_TABLE_MAXNAMELEN - 1 },
2189 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2190 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2191 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2192 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2193 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2194 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2195 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2196 .len = NFT_USERDATA_MAXLEN },
2197 [NFTA_RULE_ID] = { .type = NLA_U32 },
2200 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2201 u32 portid, u32 seq, int event,
2202 u32 flags, int family,
2203 const struct nft_table *table,
2204 const struct nft_chain *chain,
2205 const struct nft_rule *rule)
2207 struct nlmsghdr *nlh;
2208 struct nfgenmsg *nfmsg;
2209 const struct nft_expr *expr, *next;
2210 struct nlattr *list;
2211 const struct nft_rule *prule;
2212 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2214 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2216 goto nla_put_failure;
2218 nfmsg = nlmsg_data(nlh);
2219 nfmsg->nfgen_family = family;
2220 nfmsg->version = NFNETLINK_V0;
2221 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
2223 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2224 goto nla_put_failure;
2225 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2226 goto nla_put_failure;
2227 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2229 goto nla_put_failure;
2231 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
2232 prule = list_prev_entry(rule, list);
2233 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2234 cpu_to_be64(prule->handle),
2236 goto nla_put_failure;
2239 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
2241 goto nla_put_failure;
2242 nft_rule_for_each_expr(expr, next, rule) {
2243 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2244 goto nla_put_failure;
2246 nla_nest_end(skb, list);
2249 struct nft_userdata *udata = nft_userdata(rule);
2250 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2252 goto nla_put_failure;
2255 nlmsg_end(skb, nlh);
2259 nlmsg_trim(skb, nlh);
2263 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2264 const struct nft_rule *rule, int event)
2266 struct sk_buff *skb;
2270 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2273 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2277 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2278 event, 0, ctx->family, ctx->table,
2285 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2286 ctx->report, GFP_KERNEL);
2289 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2292 struct nft_rule_dump_ctx {
2297 static int __nf_tables_dump_rules(struct sk_buff *skb,
2299 struct netlink_callback *cb,
2300 const struct nft_table *table,
2301 const struct nft_chain *chain)
2303 struct net *net = sock_net(skb->sk);
2304 unsigned int s_idx = cb->args[0];
2305 const struct nft_rule *rule;
2307 list_for_each_entry_rcu(rule, &chain->rules, list) {
2308 if (!nft_is_active(net, rule))
2313 memset(&cb->args[1], 0,
2314 sizeof(cb->args) - sizeof(cb->args[0]));
2316 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2319 NLM_F_MULTI | NLM_F_APPEND,
2321 table, chain, rule) < 0)
2324 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2331 static int nf_tables_dump_rules(struct sk_buff *skb,
2332 struct netlink_callback *cb)
2334 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2335 const struct nft_rule_dump_ctx *ctx = cb->data;
2336 struct nft_table *table;
2337 const struct nft_chain *chain;
2338 unsigned int idx = 0;
2339 struct net *net = sock_net(skb->sk);
2340 int family = nfmsg->nfgen_family;
2343 cb->seq = net->nft.base_seq;
2345 list_for_each_entry_rcu(table, &net->nft.tables, list) {
2346 if (family != NFPROTO_UNSPEC && family != table->family)
2349 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2352 if (ctx && ctx->table && ctx->chain) {
2353 struct rhlist_head *list, *tmp;
2355 list = rhltable_lookup(&table->chains_ht, ctx->chain,
2356 nft_chain_ht_params);
2360 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2361 if (!nft_is_active(net, chain))
2363 __nf_tables_dump_rules(skb, &idx,
2370 list_for_each_entry_rcu(chain, &table->chains, list) {
2371 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2375 if (ctx && ctx->table)
2385 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2387 const struct nlattr * const *nla = cb->data;
2388 struct nft_rule_dump_ctx *ctx = NULL;
2390 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2391 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2395 if (nla[NFTA_RULE_TABLE]) {
2396 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2403 if (nla[NFTA_RULE_CHAIN]) {
2404 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2418 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2420 struct nft_rule_dump_ctx *ctx = cb->data;
2430 /* called with rcu_read_lock held */
2431 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2432 struct sk_buff *skb, const struct nlmsghdr *nlh,
2433 const struct nlattr * const nla[],
2434 struct netlink_ext_ack *extack)
2436 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2437 u8 genmask = nft_genmask_cur(net);
2438 const struct nft_chain *chain;
2439 const struct nft_rule *rule;
2440 struct nft_table *table;
2441 struct sk_buff *skb2;
2442 int family = nfmsg->nfgen_family;
2445 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2446 struct netlink_dump_control c = {
2447 .start= nf_tables_dump_rules_start,
2448 .dump = nf_tables_dump_rules,
2449 .done = nf_tables_dump_rules_done,
2450 .module = THIS_MODULE,
2451 .data = (void *)nla,
2454 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
2457 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2458 if (IS_ERR(table)) {
2459 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2460 return PTR_ERR(table);
2463 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2464 if (IS_ERR(chain)) {
2465 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2466 return PTR_ERR(chain);
2469 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2471 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2472 return PTR_ERR(rule);
2475 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
2479 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2480 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2481 family, table, chain, rule);
2485 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2492 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2493 struct nft_rule *rule)
2495 struct nft_expr *expr, *next;
2498 * Careful: some expressions might not be initialized in case this
2499 * is called on error from nf_tables_newrule().
2501 expr = nft_expr_first(rule);
2502 while (expr != nft_expr_last(rule) && expr->ops) {
2503 next = nft_expr_next(expr);
2504 nf_tables_expr_destroy(ctx, expr);
2510 static void nf_tables_rule_release(const struct nft_ctx *ctx,
2511 struct nft_rule *rule)
2513 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
2514 nf_tables_rule_destroy(ctx, rule);
2517 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
2519 struct nft_expr *expr, *last;
2520 const struct nft_data *data;
2521 struct nft_rule *rule;
2524 if (ctx->level == NFT_JUMP_STACK_SIZE)
2527 list_for_each_entry(rule, &chain->rules, list) {
2528 if (!nft_is_active_next(ctx->net, rule))
2531 nft_rule_for_each_expr(expr, last, rule) {
2532 if (!expr->ops->validate)
2535 err = expr->ops->validate(ctx, expr, &data);
2543 EXPORT_SYMBOL_GPL(nft_chain_validate);
2545 static int nft_table_validate(struct net *net, const struct nft_table *table)
2547 struct nft_chain *chain;
2548 struct nft_ctx ctx = {
2550 .family = table->family,
2554 list_for_each_entry(chain, &table->chains, list) {
2555 if (!nft_is_base_chain(chain))
2559 err = nft_chain_validate(&ctx, chain);
2567 #define NFT_RULE_MAXEXPRS 128
2569 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2570 struct sk_buff *skb, const struct nlmsghdr *nlh,
2571 const struct nlattr * const nla[],
2572 struct netlink_ext_ack *extack)
2574 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2575 u8 genmask = nft_genmask_next(net);
2576 struct nft_expr_info *info = NULL;
2577 int family = nfmsg->nfgen_family;
2578 struct nft_table *table;
2579 struct nft_chain *chain;
2580 struct nft_rule *rule, *old_rule = NULL;
2581 struct nft_userdata *udata;
2582 struct nft_trans *trans = NULL;
2583 struct nft_expr *expr;
2586 unsigned int size, i, n, ulen = 0, usize = 0;
2588 u64 handle, pos_handle;
2590 lockdep_assert_held(&net->nft.commit_mutex);
2592 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2593 if (IS_ERR(table)) {
2594 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2595 return PTR_ERR(table);
2598 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2599 if (IS_ERR(chain)) {
2600 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2601 return PTR_ERR(chain);
2604 if (nla[NFTA_RULE_HANDLE]) {
2605 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2606 rule = __nft_rule_lookup(chain, handle);
2608 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2609 return PTR_ERR(rule);
2612 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2613 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2616 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2621 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
2622 nlh->nlmsg_flags & NLM_F_REPLACE)
2624 handle = nf_tables_alloc_handle(table);
2626 if (chain->use == UINT_MAX)
2629 if (nla[NFTA_RULE_POSITION]) {
2630 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2631 old_rule = __nft_rule_lookup(chain, pos_handle);
2632 if (IS_ERR(old_rule)) {
2633 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
2634 return PTR_ERR(old_rule);
2639 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2643 if (nla[NFTA_RULE_EXPRESSIONS]) {
2644 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
2645 sizeof(struct nft_expr_info),
2650 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2652 if (nla_type(tmp) != NFTA_LIST_ELEM)
2654 if (n == NFT_RULE_MAXEXPRS)
2656 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2659 size += info[n].ops->size;
2663 /* Check for overflow of dlen field */
2665 if (size >= 1 << 12)
2668 if (nla[NFTA_RULE_USERDATA]) {
2669 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2671 usize = sizeof(struct nft_userdata) + ulen;
2675 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2679 nft_activate_next(net, rule);
2681 rule->handle = handle;
2683 rule->udata = ulen ? 1 : 0;
2686 udata = nft_userdata(rule);
2687 udata->len = ulen - 1;
2688 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2691 expr = nft_expr_first(rule);
2692 for (i = 0; i < n; i++) {
2693 err = nf_tables_newexpr(&ctx, &info[i], expr);
2697 if (info[i].ops->validate)
2698 nft_validate_state_update(net, NFT_VALIDATE_NEED);
2701 expr = nft_expr_next(expr);
2704 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2705 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
2706 if (trans == NULL) {
2710 err = nft_delrule(&ctx, old_rule);
2712 nft_trans_destroy(trans);
2716 list_add_tail_rcu(&rule->list, &old_rule->list);
2718 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2723 if (nlh->nlmsg_flags & NLM_F_APPEND) {
2725 list_add_rcu(&rule->list, &old_rule->list);
2727 list_add_tail_rcu(&rule->list, &chain->rules);
2730 list_add_tail_rcu(&rule->list, &old_rule->list);
2732 list_add_rcu(&rule->list, &chain->rules);
2738 if (net->nft.validate_state == NFT_VALIDATE_DO)
2739 return nft_table_validate(net, table);
2743 nf_tables_rule_release(&ctx, rule);
2745 for (i = 0; i < n; i++) {
2746 if (info[i].ops != NULL)
2747 module_put(info[i].ops->type->owner);
2753 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2754 const struct nlattr *nla)
2756 u32 id = ntohl(nla_get_be32(nla));
2757 struct nft_trans *trans;
2759 list_for_each_entry(trans, &net->nft.commit_list, list) {
2760 struct nft_rule *rule = nft_trans_rule(trans);
2762 if (trans->msg_type == NFT_MSG_NEWRULE &&
2763 id == nft_trans_rule_id(trans))
2766 return ERR_PTR(-ENOENT);
2769 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2770 struct sk_buff *skb, const struct nlmsghdr *nlh,
2771 const struct nlattr * const nla[],
2772 struct netlink_ext_ack *extack)
2774 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2775 u8 genmask = nft_genmask_next(net);
2776 struct nft_table *table;
2777 struct nft_chain *chain = NULL;
2778 struct nft_rule *rule;
2779 int family = nfmsg->nfgen_family, err = 0;
2782 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2783 if (IS_ERR(table)) {
2784 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2785 return PTR_ERR(table);
2788 if (nla[NFTA_RULE_CHAIN]) {
2789 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
2791 if (IS_ERR(chain)) {
2792 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2793 return PTR_ERR(chain);
2797 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2800 if (nla[NFTA_RULE_HANDLE]) {
2801 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2803 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2804 return PTR_ERR(rule);
2807 err = nft_delrule(&ctx, rule);
2808 } else if (nla[NFTA_RULE_ID]) {
2809 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2811 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
2812 return PTR_ERR(rule);
2815 err = nft_delrule(&ctx, rule);
2817 err = nft_delrule_by_chain(&ctx);
2820 list_for_each_entry(chain, &table->chains, list) {
2821 if (!nft_is_active_next(net, chain))
2825 err = nft_delrule_by_chain(&ctx);
2838 static LIST_HEAD(nf_tables_set_types);
2840 int nft_register_set(struct nft_set_type *type)
2842 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2843 list_add_tail_rcu(&type->list, &nf_tables_set_types);
2844 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2847 EXPORT_SYMBOL_GPL(nft_register_set);
2849 void nft_unregister_set(struct nft_set_type *type)
2851 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2852 list_del_rcu(&type->list);
2853 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2855 EXPORT_SYMBOL_GPL(nft_unregister_set);
2857 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
2858 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
2861 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
2863 return (flags & type->features) == (flags & NFT_SET_FEATURES);
2867 * Select a set implementation based on the data characteristics and the
2868 * given policy. The total memory use might not be known if no size is
2869 * given, in that case the amount of memory per element is used.
2871 static const struct nft_set_ops *
2872 nft_select_set_ops(const struct nft_ctx *ctx,
2873 const struct nlattr * const nla[],
2874 const struct nft_set_desc *desc,
2875 enum nft_set_policies policy)
2877 const struct nft_set_ops *ops, *bops;
2878 struct nft_set_estimate est, best;
2879 const struct nft_set_type *type;
2882 lockdep_assert_held(&ctx->net->nft.commit_mutex);
2883 lockdep_nfnl_nft_mutex_not_held();
2884 #ifdef CONFIG_MODULES
2885 if (list_empty(&nf_tables_set_types)) {
2886 nft_request_module(ctx->net, "nft-set");
2887 if (!list_empty(&nf_tables_set_types))
2888 return ERR_PTR(-EAGAIN);
2891 if (nla[NFTA_SET_FLAGS] != NULL)
2892 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2899 list_for_each_entry(type, &nf_tables_set_types, list) {
2902 if (!nft_set_ops_candidate(type, flags))
2904 if (!ops->estimate(desc, flags, &est))
2908 case NFT_SET_POL_PERFORMANCE:
2909 if (est.lookup < best.lookup)
2911 if (est.lookup == best.lookup &&
2912 est.space < best.space)
2915 case NFT_SET_POL_MEMORY:
2917 if (est.space < best.space)
2919 if (est.space == best.space &&
2920 est.lookup < best.lookup)
2922 } else if (est.size < best.size || !bops) {
2930 if (!try_module_get(type->owner))
2933 module_put(to_set_type(bops)->owner);
2942 return ERR_PTR(-EOPNOTSUPP);
2945 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2946 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2947 .len = NFT_TABLE_MAXNAMELEN - 1 },
2948 [NFTA_SET_NAME] = { .type = NLA_STRING,
2949 .len = NFT_SET_MAXNAMELEN - 1 },
2950 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2951 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2952 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2953 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2954 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2955 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2956 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2957 [NFTA_SET_ID] = { .type = NLA_U32 },
2958 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2959 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2960 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2961 .len = NFT_USERDATA_MAXLEN },
2962 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
2963 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
2966 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2967 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2970 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2971 const struct sk_buff *skb,
2972 const struct nlmsghdr *nlh,
2973 const struct nlattr * const nla[],
2974 struct netlink_ext_ack *extack,
2977 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2978 int family = nfmsg->nfgen_family;
2979 struct nft_table *table = NULL;
2981 if (nla[NFTA_SET_TABLE] != NULL) {
2982 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
2984 if (IS_ERR(table)) {
2985 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
2986 return PTR_ERR(table);
2990 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
2994 static struct nft_set *nft_set_lookup(const struct nft_table *table,
2995 const struct nlattr *nla, u8 genmask)
2997 struct nft_set *set;
3000 return ERR_PTR(-EINVAL);
3002 list_for_each_entry_rcu(set, &table->sets, list) {
3003 if (!nla_strcmp(nla, set->name) &&
3004 nft_active_genmask(set, genmask))
3007 return ERR_PTR(-ENOENT);
3010 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3011 const struct nlattr *nla,
3014 struct nft_set *set;
3016 list_for_each_entry(set, &table->sets, list) {
3017 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3018 nft_active_genmask(set, genmask))
3021 return ERR_PTR(-ENOENT);
3024 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3025 const struct nlattr *nla, u8 genmask)
3027 struct nft_trans *trans;
3028 u32 id = ntohl(nla_get_be32(nla));
3030 list_for_each_entry(trans, &net->nft.commit_list, list) {
3031 if (trans->msg_type == NFT_MSG_NEWSET) {
3032 struct nft_set *set = nft_trans_set(trans);
3034 if (id == nft_trans_set_id(trans) &&
3035 nft_active_genmask(set, genmask))
3039 return ERR_PTR(-ENOENT);
3042 struct nft_set *nft_set_lookup_global(const struct net *net,
3043 const struct nft_table *table,
3044 const struct nlattr *nla_set_name,
3045 const struct nlattr *nla_set_id,
3048 struct nft_set *set;
3050 set = nft_set_lookup(table, nla_set_name, genmask);
3055 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3059 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3061 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3064 const struct nft_set *i;
3066 unsigned long *inuse;
3067 unsigned int n = 0, min = 0;
3069 p = strchr(name, '%');
3071 if (p[1] != 'd' || strchr(p + 2, '%'))
3074 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3078 list_for_each_entry(i, &ctx->table->sets, list) {
3081 if (!nft_is_active_next(ctx->net, set))
3083 if (!sscanf(i->name, name, &tmp))
3085 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3088 set_bit(tmp - min, inuse);
3091 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3092 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3093 min += BITS_PER_BYTE * PAGE_SIZE;
3094 memset(inuse, 0, PAGE_SIZE);
3097 free_page((unsigned long)inuse);
3100 set->name = kasprintf(GFP_KERNEL, name, min + n);
3104 list_for_each_entry(i, &ctx->table->sets, list) {
3105 if (!nft_is_active_next(ctx->net, i))
3107 if (!strcmp(set->name, i->name)) {
3115 static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3117 u64 ms = be64_to_cpu(nla_get_be64(nla));
3118 u64 max = (u64)(~((u64)0));
3120 max = div_u64(max, NSEC_PER_MSEC);
3124 ms *= NSEC_PER_MSEC;
3125 *result = nsecs_to_jiffies64(ms);
3129 static __be64 nf_jiffies64_to_msecs(u64 input)
3131 u64 ms = jiffies64_to_nsecs(input);
3133 return cpu_to_be64(div_u64(ms, NSEC_PER_MSEC));
3136 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3137 const struct nft_set *set, u16 event, u16 flags)
3139 struct nfgenmsg *nfmsg;
3140 struct nlmsghdr *nlh;
3141 struct nlattr *desc;
3142 u32 portid = ctx->portid;
3145 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3146 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3149 goto nla_put_failure;
3151 nfmsg = nlmsg_data(nlh);
3152 nfmsg->nfgen_family = ctx->family;
3153 nfmsg->version = NFNETLINK_V0;
3154 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3156 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3157 goto nla_put_failure;
3158 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3159 goto nla_put_failure;
3160 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3162 goto nla_put_failure;
3163 if (set->flags != 0)
3164 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3165 goto nla_put_failure;
3167 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3168 goto nla_put_failure;
3169 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3170 goto nla_put_failure;
3171 if (set->flags & NFT_SET_MAP) {
3172 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3173 goto nla_put_failure;
3174 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3175 goto nla_put_failure;
3177 if (set->flags & NFT_SET_OBJECT &&
3178 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3179 goto nla_put_failure;
3182 nla_put_be64(skb, NFTA_SET_TIMEOUT,
3183 nf_jiffies64_to_msecs(set->timeout),
3185 goto nla_put_failure;
3187 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3188 goto nla_put_failure;
3190 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3191 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3192 goto nla_put_failure;
3195 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3196 goto nla_put_failure;
3198 desc = nla_nest_start(skb, NFTA_SET_DESC);
3200 goto nla_put_failure;
3202 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3203 goto nla_put_failure;
3204 nla_nest_end(skb, desc);
3206 nlmsg_end(skb, nlh);
3210 nlmsg_trim(skb, nlh);
3214 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3215 const struct nft_set *set, int event,
3218 struct sk_buff *skb;
3219 u32 portid = ctx->portid;
3223 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3226 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3230 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3236 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
3240 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3243 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3245 const struct nft_set *set;
3246 unsigned int idx, s_idx = cb->args[0];
3247 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3248 struct net *net = sock_net(skb->sk);
3249 struct nft_ctx *ctx = cb->data, ctx_set;
3255 cb->seq = net->nft.base_seq;
3257 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3258 if (ctx->family != NFPROTO_UNSPEC &&
3259 ctx->family != table->family)
3262 if (ctx->table && ctx->table != table)
3266 if (cur_table != table)
3272 list_for_each_entry_rcu(set, &table->sets, list) {
3275 if (!nft_is_active(net, set))
3279 ctx_set.table = table;
3280 ctx_set.family = table->family;
3282 if (nf_tables_fill_set(skb, &ctx_set, set,
3286 cb->args[2] = (unsigned long) table;
3289 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3302 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3304 struct nft_ctx *ctx_dump = NULL;
3306 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3307 if (ctx_dump == NULL)
3310 cb->data = ctx_dump;
3314 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3320 /* called with rcu_read_lock held */
3321 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3322 struct sk_buff *skb, const struct nlmsghdr *nlh,
3323 const struct nlattr * const nla[],
3324 struct netlink_ext_ack *extack)
3326 u8 genmask = nft_genmask_cur(net);
3327 const struct nft_set *set;
3329 struct sk_buff *skb2;
3330 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3333 /* Verify existence before starting dump */
3334 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3339 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3340 struct netlink_dump_control c = {
3341 .start = nf_tables_dump_sets_start,
3342 .dump = nf_tables_dump_sets,
3343 .done = nf_tables_dump_sets_done,
3345 .module = THIS_MODULE,
3348 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3351 /* Only accept unspec with dump */
3352 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3353 return -EAFNOSUPPORT;
3354 if (!nla[NFTA_SET_TABLE])
3357 set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3359 return PTR_ERR(set);
3361 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3365 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3369 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3376 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
3377 struct nft_set_desc *desc,
3378 const struct nlattr *nla)
3380 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
3383 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
3384 nft_set_desc_policy, NULL);
3388 if (da[NFTA_SET_DESC_SIZE] != NULL)
3389 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
3394 static int nf_tables_newset(struct net *net, struct sock *nlsk,
3395 struct sk_buff *skb, const struct nlmsghdr *nlh,
3396 const struct nlattr * const nla[],
3397 struct netlink_ext_ack *extack)
3399 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3400 u8 genmask = nft_genmask_next(net);
3401 int family = nfmsg->nfgen_family;
3402 const struct nft_set_ops *ops;
3403 struct nft_table *table;
3404 struct nft_set *set;
3409 u32 ktype, dtype, flags, policy, gc_int, objtype;
3410 struct nft_set_desc desc;
3411 unsigned char *udata;
3415 if (nla[NFTA_SET_TABLE] == NULL ||
3416 nla[NFTA_SET_NAME] == NULL ||
3417 nla[NFTA_SET_KEY_LEN] == NULL ||
3418 nla[NFTA_SET_ID] == NULL)
3421 memset(&desc, 0, sizeof(desc));
3423 ktype = NFT_DATA_VALUE;
3424 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3425 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3426 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3430 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
3431 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
3435 if (nla[NFTA_SET_FLAGS] != NULL) {
3436 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3437 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
3438 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
3439 NFT_SET_MAP | NFT_SET_EVAL |
3442 /* Only one of these operations is supported */
3443 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3444 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
3449 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3450 if (!(flags & NFT_SET_MAP))
3453 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3454 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3455 dtype != NFT_DATA_VERDICT)
3458 if (dtype != NFT_DATA_VERDICT) {
3459 if (nla[NFTA_SET_DATA_LEN] == NULL)
3461 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
3462 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
3465 desc.dlen = sizeof(struct nft_verdict);
3466 } else if (flags & NFT_SET_MAP)
3469 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3470 if (!(flags & NFT_SET_OBJECT))
3473 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3474 if (objtype == NFT_OBJECT_UNSPEC ||
3475 objtype > NFT_OBJECT_MAX)
3477 } else if (flags & NFT_SET_OBJECT)
3480 objtype = NFT_OBJECT_UNSPEC;
3483 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3484 if (!(flags & NFT_SET_TIMEOUT))
3487 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
3492 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3493 if (!(flags & NFT_SET_TIMEOUT))
3495 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3498 policy = NFT_SET_POL_PERFORMANCE;
3499 if (nla[NFTA_SET_POLICY] != NULL)
3500 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3502 if (nla[NFTA_SET_DESC] != NULL) {
3503 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
3508 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
3509 if (IS_ERR(table)) {
3510 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3511 return PTR_ERR(table);
3514 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
3516 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
3518 if (PTR_ERR(set) != -ENOENT) {
3519 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3520 return PTR_ERR(set);
3523 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3524 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3527 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3533 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3536 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
3538 return PTR_ERR(ops);
3541 if (nla[NFTA_SET_USERDATA])
3542 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3545 if (ops->privsize != NULL)
3546 size = ops->privsize(nla, &desc);
3548 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3554 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3560 err = nf_tables_set_alloc_name(&ctx, set, name);
3567 udata = set->data + size;
3568 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3571 INIT_LIST_HEAD(&set->bindings);
3573 write_pnet(&set->net, net);
3576 set->klen = desc.klen;
3578 set->objtype = objtype;
3579 set->dlen = desc.dlen;
3581 set->size = desc.size;
3582 set->policy = policy;
3585 set->timeout = timeout;
3586 set->gc_int = gc_int;
3587 set->handle = nf_tables_alloc_handle(table);
3589 err = ops->init(set, &desc, nla);
3593 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3597 list_add_tail_rcu(&set->list, &table->sets);
3608 module_put(to_set_type(ops)->owner);
3612 static void nft_set_destroy(struct nft_set *set)
3614 set->ops->destroy(set);
3615 module_put(to_set_type(set->ops)->owner);
3620 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3621 struct sk_buff *skb, const struct nlmsghdr *nlh,
3622 const struct nlattr * const nla[],
3623 struct netlink_ext_ack *extack)
3625 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3626 u8 genmask = nft_genmask_next(net);
3627 const struct nlattr *attr;
3628 struct nft_set *set;
3632 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3633 return -EAFNOSUPPORT;
3634 if (nla[NFTA_SET_TABLE] == NULL)
3637 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3642 if (nla[NFTA_SET_HANDLE]) {
3643 attr = nla[NFTA_SET_HANDLE];
3644 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
3646 attr = nla[NFTA_SET_NAME];
3647 set = nft_set_lookup(ctx.table, attr, genmask);
3651 NL_SET_BAD_ATTR(extack, attr);
3652 return PTR_ERR(set);
3654 if (!list_empty(&set->bindings) ||
3655 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
3656 NL_SET_BAD_ATTR(extack, attr);
3660 return nft_delset(&ctx, set);
3663 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3664 struct nft_set *set,
3665 const struct nft_set_iter *iter,
3666 struct nft_set_elem *elem)
3668 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3669 enum nft_registers dreg;
3671 dreg = nft_type_to_reg(set->dtype);
3672 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3673 set->dtype == NFT_DATA_VERDICT ?
3674 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3678 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3679 struct nft_set_binding *binding)
3681 struct nft_set_binding *i;
3682 struct nft_set_iter iter;
3684 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
3687 if (binding->flags & NFT_SET_MAP) {
3688 /* If the set is already bound to the same chain all
3689 * jumps are already validated for that chain.
3691 list_for_each_entry(i, &set->bindings, list) {
3692 if (i->flags & NFT_SET_MAP &&
3693 i->chain == binding->chain)
3697 iter.genmask = nft_genmask_next(ctx->net);
3701 iter.fn = nf_tables_bind_check_setelem;
3703 set->ops->walk(ctx, set, &iter);
3708 binding->chain = ctx->chain;
3709 list_add_tail_rcu(&binding->list, &set->bindings);
3710 nft_set_trans_bind(ctx, set);
3714 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3716 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3717 struct nft_set_binding *binding, bool event)
3719 list_del_rcu(&binding->list);
3721 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
3722 list_del_rcu(&set->list);
3724 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
3728 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3730 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
3732 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
3733 nft_set_destroy(set);
3735 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
3737 const struct nft_set_ext_type nft_set_ext_types[] = {
3738 [NFT_SET_EXT_KEY] = {
3739 .align = __alignof__(u32),
3741 [NFT_SET_EXT_DATA] = {
3742 .align = __alignof__(u32),
3744 [NFT_SET_EXT_EXPR] = {
3745 .align = __alignof__(struct nft_expr),
3747 [NFT_SET_EXT_OBJREF] = {
3748 .len = sizeof(struct nft_object *),
3749 .align = __alignof__(struct nft_object *),
3751 [NFT_SET_EXT_FLAGS] = {
3753 .align = __alignof__(u8),
3755 [NFT_SET_EXT_TIMEOUT] = {
3757 .align = __alignof__(u64),
3759 [NFT_SET_EXT_EXPIRATION] = {
3761 .align = __alignof__(u64),
3763 [NFT_SET_EXT_USERDATA] = {
3764 .len = sizeof(struct nft_userdata),
3765 .align = __alignof__(struct nft_userdata),
3768 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3774 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3775 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3776 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3777 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3778 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3779 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3780 .len = NFT_USERDATA_MAXLEN },
3781 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
3782 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING },
3785 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3786 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3787 .len = NFT_TABLE_MAXNAMELEN - 1 },
3788 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3789 .len = NFT_SET_MAXNAMELEN - 1 },
3790 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3791 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3794 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3795 const struct sk_buff *skb,
3796 const struct nlmsghdr *nlh,
3797 const struct nlattr * const nla[],
3798 struct netlink_ext_ack *extack,
3801 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3802 int family = nfmsg->nfgen_family;
3803 struct nft_table *table;
3805 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
3807 if (IS_ERR(table)) {
3808 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
3809 return PTR_ERR(table);
3812 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3816 static int nf_tables_fill_setelem(struct sk_buff *skb,
3817 const struct nft_set *set,
3818 const struct nft_set_elem *elem)
3820 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3821 unsigned char *b = skb_tail_pointer(skb);
3822 struct nlattr *nest;
3824 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3826 goto nla_put_failure;
3828 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3829 NFT_DATA_VALUE, set->klen) < 0)
3830 goto nla_put_failure;
3832 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3833 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3834 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3836 goto nla_put_failure;
3838 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3839 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3840 goto nla_put_failure;
3842 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3843 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3844 (*nft_set_ext_obj(ext))->name) < 0)
3845 goto nla_put_failure;
3847 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3848 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3849 htonl(*nft_set_ext_flags(ext))))
3850 goto nla_put_failure;
3852 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3853 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3854 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
3856 goto nla_put_failure;
3858 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3859 u64 expires, now = get_jiffies_64();
3861 expires = *nft_set_ext_expiration(ext);
3862 if (time_before64(now, expires))
3867 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3868 nf_jiffies64_to_msecs(expires),
3870 goto nla_put_failure;
3873 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3874 struct nft_userdata *udata;
3876 udata = nft_set_ext_userdata(ext);
3877 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3878 udata->len + 1, udata->data))
3879 goto nla_put_failure;
3882 nla_nest_end(skb, nest);
3890 struct nft_set_dump_args {
3891 const struct netlink_callback *cb;
3892 struct nft_set_iter iter;
3893 struct sk_buff *skb;
3896 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3897 struct nft_set *set,
3898 const struct nft_set_iter *iter,
3899 struct nft_set_elem *elem)
3901 struct nft_set_dump_args *args;
3903 args = container_of(iter, struct nft_set_dump_args, iter);
3904 return nf_tables_fill_setelem(args->skb, set, elem);
3907 struct nft_set_dump_ctx {
3908 const struct nft_set *set;
3912 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3914 struct nft_set_dump_ctx *dump_ctx = cb->data;
3915 struct net *net = sock_net(skb->sk);
3916 struct nft_table *table;
3917 struct nft_set *set;
3918 struct nft_set_dump_args args;
3919 bool set_found = false;
3920 struct nfgenmsg *nfmsg;
3921 struct nlmsghdr *nlh;
3922 struct nlattr *nest;
3927 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3928 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
3929 dump_ctx->ctx.family != table->family)
3932 if (table != dump_ctx->ctx.table)
3935 list_for_each_entry_rcu(set, &table->sets, list) {
3936 if (set == dump_ctx->set) {
3949 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
3950 portid = NETLINK_CB(cb->skb).portid;
3951 seq = cb->nlh->nlmsg_seq;
3953 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3956 goto nla_put_failure;
3958 nfmsg = nlmsg_data(nlh);
3959 nfmsg->nfgen_family = table->family;
3960 nfmsg->version = NFNETLINK_V0;
3961 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3963 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
3964 goto nla_put_failure;
3965 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3966 goto nla_put_failure;
3968 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3970 goto nla_put_failure;
3974 args.iter.genmask = nft_genmask_cur(net);
3975 args.iter.skip = cb->args[0];
3976 args.iter.count = 0;
3978 args.iter.fn = nf_tables_dump_setelem;
3979 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
3982 nla_nest_end(skb, nest);
3983 nlmsg_end(skb, nlh);
3985 if (args.iter.err && args.iter.err != -EMSGSIZE)
3986 return args.iter.err;
3987 if (args.iter.count == cb->args[0])
3990 cb->args[0] = args.iter.count;
3998 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4000 struct nft_set_dump_ctx *dump_ctx = cb->data;
4002 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4004 return cb->data ? 0 : -ENOMEM;
4007 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4013 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4014 const struct nft_ctx *ctx, u32 seq,
4015 u32 portid, int event, u16 flags,
4016 const struct nft_set *set,
4017 const struct nft_set_elem *elem)
4019 struct nfgenmsg *nfmsg;
4020 struct nlmsghdr *nlh;
4021 struct nlattr *nest;
4024 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4025 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4028 goto nla_put_failure;
4030 nfmsg = nlmsg_data(nlh);
4031 nfmsg->nfgen_family = ctx->family;
4032 nfmsg->version = NFNETLINK_V0;
4033 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
4035 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4036 goto nla_put_failure;
4037 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4038 goto nla_put_failure;
4040 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4042 goto nla_put_failure;
4044 err = nf_tables_fill_setelem(skb, set, elem);
4046 goto nla_put_failure;
4048 nla_nest_end(skb, nest);
4050 nlmsg_end(skb, nlh);
4054 nlmsg_trim(skb, nlh);
4058 static int nft_setelem_parse_flags(const struct nft_set *set,
4059 const struct nlattr *attr, u32 *flags)
4064 *flags = ntohl(nla_get_be32(attr));
4065 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4067 if (!(set->flags & NFT_SET_INTERVAL) &&
4068 *flags & NFT_SET_ELEM_INTERVAL_END)
4074 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4075 const struct nlattr *attr)
4077 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4078 struct nft_data_desc desc;
4079 struct nft_set_elem elem;
4080 struct sk_buff *skb;
4085 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4086 nft_set_elem_policy, NULL);
4090 if (!nla[NFTA_SET_ELEM_KEY])
4093 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4097 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4098 nla[NFTA_SET_ELEM_KEY]);
4103 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4106 priv = set->ops->get(ctx->net, set, &elem, flags);
4108 return PTR_ERR(priv);
4113 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
4117 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4118 NFT_MSG_NEWSETELEM, 0, set, &elem);
4122 err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT);
4123 /* This avoids a loop in nfnetlink. */
4131 /* this avoids a loop in nfnetlink. */
4132 return err == -EAGAIN ? -ENOBUFS : err;
4135 /* called with rcu_read_lock held */
4136 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4137 struct sk_buff *skb, const struct nlmsghdr *nlh,
4138 const struct nlattr * const nla[],
4139 struct netlink_ext_ack *extack)
4141 u8 genmask = nft_genmask_cur(net);
4142 struct nft_set *set;
4143 struct nlattr *attr;
4147 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4152 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4154 return PTR_ERR(set);
4156 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4157 struct netlink_dump_control c = {
4158 .start = nf_tables_dump_set_start,
4159 .dump = nf_tables_dump_set,
4160 .done = nf_tables_dump_set_done,
4161 .module = THIS_MODULE,
4163 struct nft_set_dump_ctx dump_ctx = {
4169 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4172 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4175 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4176 err = nft_get_set_elem(&ctx, set, attr);
4184 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4185 const struct nft_set *set,
4186 const struct nft_set_elem *elem,
4187 int event, u16 flags)
4189 struct net *net = ctx->net;
4190 u32 portid = ctx->portid;
4191 struct sk_buff *skb;
4194 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4197 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4201 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
4208 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
4212 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4215 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
4217 struct nft_set *set)
4219 struct nft_trans *trans;
4221 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
4225 nft_trans_elem_set(trans) = set;
4229 void *nft_set_elem_init(const struct nft_set *set,
4230 const struct nft_set_ext_tmpl *tmpl,
4231 const u32 *key, const u32 *data,
4232 u64 timeout, gfp_t gfp)
4234 struct nft_set_ext *ext;
4237 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
4241 ext = nft_set_elem_ext(set, elem);
4242 nft_set_ext_init(ext, tmpl);
4244 memcpy(nft_set_ext_key(ext), key, set->klen);
4245 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4246 memcpy(nft_set_ext_data(ext), data, set->dlen);
4247 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
4248 *nft_set_ext_expiration(ext) =
4249 get_jiffies_64() + timeout;
4250 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
4251 *nft_set_ext_timeout(ext) = timeout;
4256 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
4259 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4260 struct nft_ctx ctx = {
4261 .net = read_pnet(&set->net),
4262 .family = set->table->family,
4265 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
4266 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4267 nft_data_release(nft_set_ext_data(ext), set->dtype);
4268 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) {
4269 struct nft_expr *expr = nft_set_ext_expr(ext);
4271 if (expr->ops->destroy_clone) {
4272 expr->ops->destroy_clone(&ctx, expr);
4273 module_put(expr->ops->type->owner);
4275 nf_tables_expr_destroy(&ctx, expr);
4278 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4279 (*nft_set_ext_obj(ext))->use--;
4282 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
4284 /* Only called from commit path, nft_set_elem_deactivate() already deals with
4285 * the refcounting from the preparation phase.
4287 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
4288 const struct nft_set *set, void *elem)
4290 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4292 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
4293 nf_tables_expr_destroy(ctx, nft_set_ext_expr(ext));
4297 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4298 const struct nlattr *attr, u32 nlmsg_flags)
4300 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4301 u8 genmask = nft_genmask_next(ctx->net);
4302 struct nft_data_desc d1, d2;
4303 struct nft_set_ext_tmpl tmpl;
4304 struct nft_set_ext *ext, *ext2;
4305 struct nft_set_elem elem;
4306 struct nft_set_binding *binding;
4307 struct nft_object *obj = NULL;
4308 struct nft_userdata *udata;
4309 struct nft_data data;
4310 enum nft_registers dreg;
4311 struct nft_trans *trans;
4317 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4318 nft_set_elem_policy, NULL);
4322 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4325 nft_set_ext_prepare(&tmpl);
4327 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4331 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4333 if (set->flags & NFT_SET_MAP) {
4334 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
4335 !(flags & NFT_SET_ELEM_INTERVAL_END))
4337 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
4338 flags & NFT_SET_ELEM_INTERVAL_END)
4341 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4346 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
4347 if (!(set->flags & NFT_SET_TIMEOUT))
4349 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
4353 } else if (set->flags & NFT_SET_TIMEOUT) {
4354 timeout = set->timeout;
4357 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
4358 nla[NFTA_SET_ELEM_KEY]);
4362 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
4365 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
4367 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
4368 if (timeout != set->timeout)
4369 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
4372 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
4373 if (!(set->flags & NFT_SET_OBJECT)) {
4377 obj = nft_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
4378 set->objtype, genmask);
4383 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
4386 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
4387 err = nft_data_init(ctx, &data, sizeof(data), &d2,
4388 nla[NFTA_SET_ELEM_DATA]);
4393 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
4396 dreg = nft_type_to_reg(set->dtype);
4397 list_for_each_entry(binding, &set->bindings, list) {
4398 struct nft_ctx bind_ctx = {
4400 .family = ctx->family,
4401 .table = ctx->table,
4402 .chain = (struct nft_chain *)binding->chain,
4405 if (!(binding->flags & NFT_SET_MAP))
4408 err = nft_validate_register_store(&bind_ctx, dreg,
4414 if (d2.type == NFT_DATA_VERDICT &&
4415 (data.verdict.code == NFT_GOTO ||
4416 data.verdict.code == NFT_JUMP))
4417 nft_validate_state_update(ctx->net,
4421 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
4424 /* The full maximum length of userdata can exceed the maximum
4425 * offset value (U8_MAX) for following extensions, therefor it
4426 * must be the last extension added.
4429 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
4430 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
4432 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
4437 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
4438 timeout, GFP_KERNEL);
4439 if (elem.priv == NULL)
4442 ext = nft_set_elem_ext(set, elem.priv);
4444 *nft_set_ext_flags(ext) = flags;
4446 udata = nft_set_ext_userdata(ext);
4447 udata->len = ulen - 1;
4448 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
4451 *nft_set_ext_obj(ext) = obj;
4455 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
4459 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
4460 err = set->ops->insert(ctx->net, set, &elem, &ext2);
4462 if (err == -EEXIST) {
4463 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
4464 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
4465 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
4466 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
4470 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4471 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
4472 memcmp(nft_set_ext_data(ext),
4473 nft_set_ext_data(ext2), set->dlen) != 0) ||
4474 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4475 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
4476 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
4478 else if (!(nlmsg_flags & NLM_F_EXCL))
4485 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
4490 nft_trans_elem(trans) = elem;
4491 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4495 set->ops->remove(ctx->net, set, &elem);
4503 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4504 nft_data_release(&data, d2.type);
4506 nft_data_release(&elem.key.val, d1.type);
4511 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
4512 struct sk_buff *skb, const struct nlmsghdr *nlh,
4513 const struct nlattr * const nla[],
4514 struct netlink_ext_ack *extack)
4516 u8 genmask = nft_genmask_next(net);
4517 const struct nlattr *attr;
4518 struct nft_set *set;
4522 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
4525 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4530 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4531 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
4533 return PTR_ERR(set);
4535 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4538 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4539 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
4544 if (net->nft.validate_state == NFT_VALIDATE_DO)
4545 return nft_table_validate(net, ctx.table);
4551 * nft_data_hold - hold a nft_data item
4553 * @data: struct nft_data to release
4554 * @type: type of data
4556 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4557 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
4558 * NFT_GOTO verdicts. This function must be called on active data objects
4559 * from the second phase of the commit protocol.
4561 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
4563 if (type == NFT_DATA_VERDICT) {
4564 switch (data->verdict.code) {
4567 data->verdict.chain->use++;
4573 static void nft_set_elem_activate(const struct net *net,
4574 const struct nft_set *set,
4575 struct nft_set_elem *elem)
4577 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4579 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4580 nft_data_hold(nft_set_ext_data(ext), set->dtype);
4581 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4582 (*nft_set_ext_obj(ext))->use++;
4585 static void nft_set_elem_deactivate(const struct net *net,
4586 const struct nft_set *set,
4587 struct nft_set_elem *elem)
4589 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4591 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4592 nft_data_release(nft_set_ext_data(ext), set->dtype);
4593 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4594 (*nft_set_ext_obj(ext))->use--;
4597 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
4598 const struct nlattr *attr)
4600 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4601 struct nft_set_ext_tmpl tmpl;
4602 struct nft_data_desc desc;
4603 struct nft_set_elem elem;
4604 struct nft_set_ext *ext;
4605 struct nft_trans *trans;
4610 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4611 nft_set_elem_policy, NULL);
4616 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4619 nft_set_ext_prepare(&tmpl);
4621 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4625 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4627 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4628 nla[NFTA_SET_ELEM_KEY]);
4633 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4636 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
4639 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
4641 if (elem.priv == NULL)
4644 ext = nft_set_elem_ext(set, elem.priv);
4646 *nft_set_ext_flags(ext) = flags;
4648 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
4649 if (trans == NULL) {
4654 priv = set->ops->deactivate(ctx->net, set, &elem);
4662 nft_set_elem_deactivate(ctx->net, set, &elem);
4664 nft_trans_elem(trans) = elem;
4665 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4673 nft_data_release(&elem.key.val, desc.type);
4678 static int nft_flush_set(const struct nft_ctx *ctx,
4679 struct nft_set *set,
4680 const struct nft_set_iter *iter,
4681 struct nft_set_elem *elem)
4683 struct nft_trans *trans;
4686 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
4687 sizeof(struct nft_trans_elem), GFP_ATOMIC);
4691 if (!set->ops->flush(ctx->net, set, elem->priv)) {
4697 nft_set_elem_deactivate(ctx->net, set, elem);
4698 nft_trans_elem_set(trans) = set;
4699 nft_trans_elem(trans) = *elem;
4700 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4708 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
4709 struct sk_buff *skb, const struct nlmsghdr *nlh,
4710 const struct nlattr * const nla[],
4711 struct netlink_ext_ack *extack)
4713 u8 genmask = nft_genmask_next(net);
4714 const struct nlattr *attr;
4715 struct nft_set *set;
4719 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4724 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4726 return PTR_ERR(set);
4727 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4730 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
4731 struct nft_set_iter iter = {
4733 .fn = nft_flush_set,
4735 set->ops->walk(&ctx, set, &iter);
4740 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4741 err = nft_del_setelem(&ctx, set, attr);
4750 void nft_set_gc_batch_release(struct rcu_head *rcu)
4752 struct nft_set_gc_batch *gcb;
4755 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4756 for (i = 0; i < gcb->head.cnt; i++)
4757 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
4760 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4762 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4765 struct nft_set_gc_batch *gcb;
4767 gcb = kzalloc(sizeof(*gcb), gfp);
4770 gcb->head.set = set;
4773 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4780 * nft_register_obj- register nf_tables stateful object type
4783 * Registers the object type for use with nf_tables. Returns zero on
4784 * success or a negative errno code otherwise.
4786 int nft_register_obj(struct nft_object_type *obj_type)
4788 if (obj_type->type == NFT_OBJECT_UNSPEC)
4791 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4792 list_add_rcu(&obj_type->list, &nf_tables_objects);
4793 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4796 EXPORT_SYMBOL_GPL(nft_register_obj);
4799 * nft_unregister_obj - unregister nf_tables object type
4802 * Unregisters the object type for use with nf_tables.
4804 void nft_unregister_obj(struct nft_object_type *obj_type)
4806 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4807 list_del_rcu(&obj_type->list);
4808 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4810 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4812 struct nft_object *nft_obj_lookup(const struct nft_table *table,
4813 const struct nlattr *nla, u32 objtype,
4816 struct nft_object *obj;
4818 list_for_each_entry_rcu(obj, &table->objects, list) {
4819 if (!nla_strcmp(nla, obj->name) &&
4820 objtype == obj->ops->type->type &&
4821 nft_active_genmask(obj, genmask))
4824 return ERR_PTR(-ENOENT);
4826 EXPORT_SYMBOL_GPL(nft_obj_lookup);
4828 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
4829 const struct nlattr *nla,
4830 u32 objtype, u8 genmask)
4832 struct nft_object *obj;
4834 list_for_each_entry(obj, &table->objects, list) {
4835 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
4836 objtype == obj->ops->type->type &&
4837 nft_active_genmask(obj, genmask))
4840 return ERR_PTR(-ENOENT);
4843 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4844 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4845 .len = NFT_TABLE_MAXNAMELEN - 1 },
4846 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4847 .len = NFT_OBJ_MAXNAMELEN - 1 },
4848 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4849 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4850 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
4853 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4854 const struct nft_object_type *type,
4855 const struct nlattr *attr)
4858 const struct nft_object_ops *ops;
4859 struct nft_object *obj;
4862 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
4867 err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
4872 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4875 if (type->select_ops) {
4876 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
4886 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
4890 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
4903 return ERR_PTR(err);
4906 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
4907 struct nft_object *obj, bool reset)
4909 struct nlattr *nest;
4911 nest = nla_nest_start(skb, attr);
4913 goto nla_put_failure;
4914 if (obj->ops->dump(skb, obj, reset) < 0)
4915 goto nla_put_failure;
4916 nla_nest_end(skb, nest);
4923 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4925 const struct nft_object_type *type;
4927 list_for_each_entry(type, &nf_tables_objects, list) {
4928 if (objtype == type->type)
4934 static const struct nft_object_type *
4935 nft_obj_type_get(struct net *net, u32 objtype)
4937 const struct nft_object_type *type;
4939 type = __nft_obj_type_get(objtype);
4940 if (type != NULL && try_module_get(type->owner))
4943 lockdep_nfnl_nft_mutex_not_held();
4944 #ifdef CONFIG_MODULES
4946 nft_request_module(net, "nft-obj-%u", objtype);
4947 if (__nft_obj_type_get(objtype))
4948 return ERR_PTR(-EAGAIN);
4951 return ERR_PTR(-ENOENT);
4954 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4955 struct sk_buff *skb, const struct nlmsghdr *nlh,
4956 const struct nlattr * const nla[],
4957 struct netlink_ext_ack *extack)
4959 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4960 const struct nft_object_type *type;
4961 u8 genmask = nft_genmask_next(net);
4962 int family = nfmsg->nfgen_family;
4963 struct nft_table *table;
4964 struct nft_object *obj;
4969 if (!nla[NFTA_OBJ_TYPE] ||
4970 !nla[NFTA_OBJ_NAME] ||
4971 !nla[NFTA_OBJ_DATA])
4974 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
4975 if (IS_ERR(table)) {
4976 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
4977 return PTR_ERR(table);
4980 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4981 obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4984 if (err != -ENOENT) {
4985 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
4989 if (nlh->nlmsg_flags & NLM_F_EXCL) {
4990 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
4996 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
4998 type = nft_obj_type_get(net, objtype);
5000 return PTR_ERR(type);
5002 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
5008 obj->handle = nf_tables_alloc_handle(table);
5010 obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
5016 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
5020 list_add_tail_rcu(&obj->list, &table->objects);
5026 if (obj->ops->destroy)
5027 obj->ops->destroy(&ctx, obj);
5030 module_put(type->owner);
5034 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
5035 u32 portid, u32 seq, int event, u32 flags,
5036 int family, const struct nft_table *table,
5037 struct nft_object *obj, bool reset)
5039 struct nfgenmsg *nfmsg;
5040 struct nlmsghdr *nlh;
5042 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5043 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5045 goto nla_put_failure;
5047 nfmsg = nlmsg_data(nlh);
5048 nfmsg->nfgen_family = family;
5049 nfmsg->version = NFNETLINK_V0;
5050 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5052 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
5053 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
5054 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
5055 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
5056 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
5057 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
5059 goto nla_put_failure;
5061 nlmsg_end(skb, nlh);
5065 nlmsg_trim(skb, nlh);
5069 struct nft_obj_filter {
5074 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
5076 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5077 const struct nft_table *table;
5078 unsigned int idx = 0, s_idx = cb->args[0];
5079 struct nft_obj_filter *filter = cb->data;
5080 struct net *net = sock_net(skb->sk);
5081 int family = nfmsg->nfgen_family;
5082 struct nft_object *obj;
5085 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5089 cb->seq = net->nft.base_seq;
5091 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5092 if (family != NFPROTO_UNSPEC && family != table->family)
5095 list_for_each_entry_rcu(obj, &table->objects, list) {
5096 if (!nft_is_active(net, obj))
5101 memset(&cb->args[1], 0,
5102 sizeof(cb->args) - sizeof(cb->args[0]));
5103 if (filter && filter->table &&
5104 strcmp(filter->table, table->name))
5107 filter->type != NFT_OBJECT_UNSPEC &&
5108 obj->ops->type->type != filter->type)
5111 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
5114 NLM_F_MULTI | NLM_F_APPEND,
5115 table->family, table,
5119 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5131 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
5133 const struct nlattr * const *nla = cb->data;
5134 struct nft_obj_filter *filter = NULL;
5136 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
5137 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5141 if (nla[NFTA_OBJ_TABLE]) {
5142 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
5143 if (!filter->table) {
5149 if (nla[NFTA_OBJ_TYPE])
5150 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5157 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
5159 struct nft_obj_filter *filter = cb->data;
5162 kfree(filter->table);
5169 /* called with rcu_read_lock held */
5170 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
5171 struct sk_buff *skb, const struct nlmsghdr *nlh,
5172 const struct nlattr * const nla[],
5173 struct netlink_ext_ack *extack)
5175 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5176 u8 genmask = nft_genmask_cur(net);
5177 int family = nfmsg->nfgen_family;
5178 const struct nft_table *table;
5179 struct nft_object *obj;
5180 struct sk_buff *skb2;
5185 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5186 struct netlink_dump_control c = {
5187 .start = nf_tables_dump_obj_start,
5188 .dump = nf_tables_dump_obj,
5189 .done = nf_tables_dump_obj_done,
5190 .module = THIS_MODULE,
5191 .data = (void *)nla,
5194 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5197 if (!nla[NFTA_OBJ_NAME] ||
5198 !nla[NFTA_OBJ_TYPE])
5201 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5202 if (IS_ERR(table)) {
5203 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5204 return PTR_ERR(table);
5207 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5208 obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
5210 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5211 return PTR_ERR(obj);
5214 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5218 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5221 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
5222 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
5223 family, table, obj, reset);
5227 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5233 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
5235 if (obj->ops->destroy)
5236 obj->ops->destroy(ctx, obj);
5238 module_put(obj->ops->type->owner);
5243 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
5244 struct sk_buff *skb, const struct nlmsghdr *nlh,
5245 const struct nlattr * const nla[],
5246 struct netlink_ext_ack *extack)
5248 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5249 u8 genmask = nft_genmask_next(net);
5250 int family = nfmsg->nfgen_family;
5251 const struct nlattr *attr;
5252 struct nft_table *table;
5253 struct nft_object *obj;
5257 if (!nla[NFTA_OBJ_TYPE] ||
5258 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
5261 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5262 if (IS_ERR(table)) {
5263 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5264 return PTR_ERR(table);
5267 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5268 if (nla[NFTA_OBJ_HANDLE]) {
5269 attr = nla[NFTA_OBJ_HANDLE];
5270 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
5272 attr = nla[NFTA_OBJ_NAME];
5273 obj = nft_obj_lookup(table, attr, objtype, genmask);
5277 NL_SET_BAD_ATTR(extack, attr);
5278 return PTR_ERR(obj);
5281 NL_SET_BAD_ATTR(extack, attr);
5285 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5287 return nft_delobj(&ctx, obj);
5290 void nft_obj_notify(struct net *net, struct nft_table *table,
5291 struct nft_object *obj, u32 portid, u32 seq, int event,
5292 int family, int report, gfp_t gfp)
5294 struct sk_buff *skb;
5298 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5301 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
5305 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
5312 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
5315 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5317 EXPORT_SYMBOL_GPL(nft_obj_notify);
5319 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
5320 struct nft_object *obj, int event)
5322 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
5323 ctx->family, ctx->report, GFP_KERNEL);
5329 void nft_register_flowtable_type(struct nf_flowtable_type *type)
5331 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5332 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
5333 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5335 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
5337 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
5339 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5340 list_del_rcu(&type->list);
5341 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5343 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
5345 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
5346 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
5347 .len = NFT_NAME_MAXLEN - 1 },
5348 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
5349 .len = NFT_NAME_MAXLEN - 1 },
5350 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
5351 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
5354 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
5355 const struct nlattr *nla, u8 genmask)
5357 struct nft_flowtable *flowtable;
5359 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5360 if (!nla_strcmp(nla, flowtable->name) &&
5361 nft_active_genmask(flowtable, genmask))
5364 return ERR_PTR(-ENOENT);
5366 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
5368 static struct nft_flowtable *
5369 nft_flowtable_lookup_byhandle(const struct nft_table *table,
5370 const struct nlattr *nla, u8 genmask)
5372 struct nft_flowtable *flowtable;
5374 list_for_each_entry(flowtable, &table->flowtables, list) {
5375 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
5376 nft_active_genmask(flowtable, genmask))
5379 return ERR_PTR(-ENOENT);
5382 static int nf_tables_parse_devices(const struct nft_ctx *ctx,
5383 const struct nlattr *attr,
5384 struct net_device *dev_array[], int *len)
5386 const struct nlattr *tmp;
5387 struct net_device *dev;
5388 char ifname[IFNAMSIZ];
5389 int rem, n = 0, err;
5391 nla_for_each_nested(tmp, attr, rem) {
5392 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
5397 nla_strlcpy(ifname, tmp, IFNAMSIZ);
5398 dev = __dev_get_by_name(ctx->net, ifname);
5404 dev_array[n++] = dev;
5405 if (n == NFT_FLOWTABLE_DEVICE_MAX) {
5419 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
5420 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
5421 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
5422 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
5425 static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx,
5426 const struct nlattr *attr,
5427 struct nft_flowtable *flowtable)
5429 struct net_device *dev_array[NFT_FLOWTABLE_DEVICE_MAX];
5430 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
5431 struct nf_hook_ops *ops;
5432 int hooknum, priority;
5435 err = nla_parse_nested(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
5436 nft_flowtable_hook_policy, NULL);
5440 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
5441 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] ||
5442 !tb[NFTA_FLOWTABLE_HOOK_DEVS])
5445 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
5446 if (hooknum != NF_NETDEV_INGRESS)
5449 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
5451 err = nf_tables_parse_devices(ctx, tb[NFTA_FLOWTABLE_HOOK_DEVS],
5456 ops = kcalloc(n, sizeof(struct nf_hook_ops), GFP_KERNEL);
5460 flowtable->hooknum = hooknum;
5461 flowtable->priority = priority;
5462 flowtable->ops = ops;
5463 flowtable->ops_len = n;
5465 for (i = 0; i < n; i++) {
5466 flowtable->ops[i].pf = NFPROTO_NETDEV;
5467 flowtable->ops[i].hooknum = hooknum;
5468 flowtable->ops[i].priority = priority;
5469 flowtable->ops[i].priv = &flowtable->data;
5470 flowtable->ops[i].hook = flowtable->data.type->hook;
5471 flowtable->ops[i].dev = dev_array[i];
5477 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
5479 const struct nf_flowtable_type *type;
5481 list_for_each_entry(type, &nf_tables_flowtables, list) {
5482 if (family == type->family)
5488 static const struct nf_flowtable_type *
5489 nft_flowtable_type_get(struct net *net, u8 family)
5491 const struct nf_flowtable_type *type;
5493 type = __nft_flowtable_type_get(family);
5494 if (type != NULL && try_module_get(type->owner))
5497 lockdep_nfnl_nft_mutex_not_held();
5498 #ifdef CONFIG_MODULES
5500 nft_request_module(net, "nf-flowtable-%u", family);
5501 if (__nft_flowtable_type_get(family))
5502 return ERR_PTR(-EAGAIN);
5505 return ERR_PTR(-ENOENT);
5508 static void nft_unregister_flowtable_net_hooks(struct net *net,
5509 struct nft_flowtable *flowtable)
5513 for (i = 0; i < flowtable->ops_len; i++) {
5514 if (!flowtable->ops[i].dev)
5517 nf_unregister_net_hook(net, &flowtable->ops[i]);
5521 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
5522 struct sk_buff *skb,
5523 const struct nlmsghdr *nlh,
5524 const struct nlattr * const nla[],
5525 struct netlink_ext_ack *extack)
5527 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5528 const struct nf_flowtable_type *type;
5529 struct nft_flowtable *flowtable, *ft;
5530 u8 genmask = nft_genmask_next(net);
5531 int family = nfmsg->nfgen_family;
5532 struct nft_table *table;
5536 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5537 !nla[NFTA_FLOWTABLE_NAME] ||
5538 !nla[NFTA_FLOWTABLE_HOOK])
5541 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5543 if (IS_ERR(table)) {
5544 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5545 return PTR_ERR(table);
5548 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5550 if (IS_ERR(flowtable)) {
5551 err = PTR_ERR(flowtable);
5552 if (err != -ENOENT) {
5553 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5557 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5558 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5565 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5567 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
5571 flowtable->table = table;
5572 flowtable->handle = nf_tables_alloc_handle(table);
5574 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
5575 if (!flowtable->name) {
5580 type = nft_flowtable_type_get(net, family);
5582 err = PTR_ERR(type);
5586 flowtable->data.type = type;
5587 err = type->init(&flowtable->data);
5591 err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
5596 for (i = 0; i < flowtable->ops_len; i++) {
5597 if (!flowtable->ops[i].dev)
5600 list_for_each_entry(ft, &table->flowtables, list) {
5601 for (k = 0; k < ft->ops_len; k++) {
5602 if (!ft->ops[k].dev)
5605 if (flowtable->ops[i].dev == ft->ops[k].dev &&
5606 flowtable->ops[i].pf == ft->ops[k].pf) {
5613 err = nf_register_net_hook(net, &flowtable->ops[i]);
5618 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
5622 list_add_tail_rcu(&flowtable->list, &table->flowtables);
5627 i = flowtable->ops_len;
5629 for (k = i - 1; k >= 0; k--)
5630 nf_unregister_net_hook(net, &flowtable->ops[k]);
5632 kfree(flowtable->ops);
5634 flowtable->data.type->free(&flowtable->data);
5636 module_put(type->owner);
5638 kfree(flowtable->name);
5644 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
5645 struct sk_buff *skb,
5646 const struct nlmsghdr *nlh,
5647 const struct nlattr * const nla[],
5648 struct netlink_ext_ack *extack)
5650 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5651 u8 genmask = nft_genmask_next(net);
5652 int family = nfmsg->nfgen_family;
5653 struct nft_flowtable *flowtable;
5654 const struct nlattr *attr;
5655 struct nft_table *table;
5658 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5659 (!nla[NFTA_FLOWTABLE_NAME] &&
5660 !nla[NFTA_FLOWTABLE_HANDLE]))
5663 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5665 if (IS_ERR(table)) {
5666 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5667 return PTR_ERR(table);
5670 if (nla[NFTA_FLOWTABLE_HANDLE]) {
5671 attr = nla[NFTA_FLOWTABLE_HANDLE];
5672 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
5674 attr = nla[NFTA_FLOWTABLE_NAME];
5675 flowtable = nft_flowtable_lookup(table, attr, genmask);
5678 if (IS_ERR(flowtable)) {
5679 NL_SET_BAD_ATTR(extack, attr);
5680 return PTR_ERR(flowtable);
5682 if (flowtable->use > 0) {
5683 NL_SET_BAD_ATTR(extack, attr);
5687 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5689 return nft_delflowtable(&ctx, flowtable);
5692 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
5693 u32 portid, u32 seq, int event,
5694 u32 flags, int family,
5695 struct nft_flowtable *flowtable)
5697 struct nlattr *nest, *nest_devs;
5698 struct nfgenmsg *nfmsg;
5699 struct nlmsghdr *nlh;
5702 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5703 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5705 goto nla_put_failure;
5707 nfmsg = nlmsg_data(nlh);
5708 nfmsg->nfgen_family = family;
5709 nfmsg->version = NFNETLINK_V0;
5710 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5712 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
5713 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
5714 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
5715 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
5716 NFTA_FLOWTABLE_PAD))
5717 goto nla_put_failure;
5719 nest = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK);
5721 goto nla_put_failure;
5722 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
5723 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->priority)))
5724 goto nla_put_failure;
5726 nest_devs = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK_DEVS);
5728 goto nla_put_failure;
5730 for (i = 0; i < flowtable->ops_len; i++) {
5731 const struct net_device *dev = READ_ONCE(flowtable->ops[i].dev);
5734 nla_put_string(skb, NFTA_DEVICE_NAME, dev->name))
5735 goto nla_put_failure;
5737 nla_nest_end(skb, nest_devs);
5738 nla_nest_end(skb, nest);
5740 nlmsg_end(skb, nlh);
5744 nlmsg_trim(skb, nlh);
5748 struct nft_flowtable_filter {
5752 static int nf_tables_dump_flowtable(struct sk_buff *skb,
5753 struct netlink_callback *cb)
5755 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5756 struct nft_flowtable_filter *filter = cb->data;
5757 unsigned int idx = 0, s_idx = cb->args[0];
5758 struct net *net = sock_net(skb->sk);
5759 int family = nfmsg->nfgen_family;
5760 struct nft_flowtable *flowtable;
5761 const struct nft_table *table;
5764 cb->seq = net->nft.base_seq;
5766 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5767 if (family != NFPROTO_UNSPEC && family != table->family)
5770 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5771 if (!nft_is_active(net, flowtable))
5776 memset(&cb->args[1], 0,
5777 sizeof(cb->args) - sizeof(cb->args[0]));
5778 if (filter && filter->table &&
5779 strcmp(filter->table, table->name))
5782 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
5784 NFT_MSG_NEWFLOWTABLE,
5785 NLM_F_MULTI | NLM_F_APPEND,
5786 table->family, flowtable) < 0)
5789 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5801 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
5803 const struct nlattr * const *nla = cb->data;
5804 struct nft_flowtable_filter *filter = NULL;
5806 if (nla[NFTA_FLOWTABLE_TABLE]) {
5807 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5811 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
5813 if (!filter->table) {
5823 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
5825 struct nft_flowtable_filter *filter = cb->data;
5830 kfree(filter->table);
5836 /* called with rcu_read_lock held */
5837 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
5838 struct sk_buff *skb,
5839 const struct nlmsghdr *nlh,
5840 const struct nlattr * const nla[],
5841 struct netlink_ext_ack *extack)
5843 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5844 u8 genmask = nft_genmask_cur(net);
5845 int family = nfmsg->nfgen_family;
5846 struct nft_flowtable *flowtable;
5847 const struct nft_table *table;
5848 struct sk_buff *skb2;
5851 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5852 struct netlink_dump_control c = {
5853 .start = nf_tables_dump_flowtable_start,
5854 .dump = nf_tables_dump_flowtable,
5855 .done = nf_tables_dump_flowtable_done,
5856 .module = THIS_MODULE,
5857 .data = (void *)nla,
5860 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5863 if (!nla[NFTA_FLOWTABLE_NAME])
5866 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5869 return PTR_ERR(table);
5871 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5873 if (IS_ERR(flowtable))
5874 return PTR_ERR(flowtable);
5876 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5880 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
5882 NFT_MSG_NEWFLOWTABLE, 0, family,
5887 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5893 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
5894 struct nft_flowtable *flowtable,
5897 struct sk_buff *skb;
5901 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
5904 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5908 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
5910 ctx->family, flowtable);
5916 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
5917 ctx->report, GFP_KERNEL);
5920 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
5923 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
5925 kfree(flowtable->ops);
5926 kfree(flowtable->name);
5927 flowtable->data.type->free(&flowtable->data);
5928 module_put(flowtable->data.type->owner);
5932 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
5933 u32 portid, u32 seq)
5935 struct nlmsghdr *nlh;
5936 struct nfgenmsg *nfmsg;
5937 char buf[TASK_COMM_LEN];
5938 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
5940 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
5942 goto nla_put_failure;
5944 nfmsg = nlmsg_data(nlh);
5945 nfmsg->nfgen_family = AF_UNSPEC;
5946 nfmsg->version = NFNETLINK_V0;
5947 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5949 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
5950 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
5951 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
5952 goto nla_put_failure;
5954 nlmsg_end(skb, nlh);
5958 nlmsg_trim(skb, nlh);
5962 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
5963 struct nft_flowtable *flowtable)
5967 for (i = 0; i < flowtable->ops_len; i++) {
5968 if (flowtable->ops[i].dev != dev)
5971 nf_unregister_net_hook(dev_net(dev), &flowtable->ops[i]);
5972 flowtable->ops[i].dev = NULL;
5977 static int nf_tables_flowtable_event(struct notifier_block *this,
5978 unsigned long event, void *ptr)
5980 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
5981 struct nft_flowtable *flowtable;
5982 struct nft_table *table;
5985 if (event != NETDEV_UNREGISTER)
5989 mutex_lock(&net->nft.commit_mutex);
5990 list_for_each_entry(table, &net->nft.tables, list) {
5991 list_for_each_entry(flowtable, &table->flowtables, list) {
5992 nft_flowtable_event(event, dev, flowtable);
5995 mutex_unlock(&net->nft.commit_mutex);
6000 static struct notifier_block nf_tables_flowtable_notifier = {
6001 .notifier_call = nf_tables_flowtable_event,
6004 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
6007 struct nlmsghdr *nlh = nlmsg_hdr(skb);
6008 struct sk_buff *skb2;
6011 if (nlmsg_report(nlh) &&
6012 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6015 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6019 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6026 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6027 nlmsg_report(nlh), GFP_KERNEL);
6030 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6034 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
6035 struct sk_buff *skb, const struct nlmsghdr *nlh,
6036 const struct nlattr * const nla[],
6037 struct netlink_ext_ack *extack)
6039 struct sk_buff *skb2;
6042 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6046 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6051 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
6057 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
6058 [NFT_MSG_NEWTABLE] = {
6059 .call_batch = nf_tables_newtable,
6060 .attr_count = NFTA_TABLE_MAX,
6061 .policy = nft_table_policy,
6063 [NFT_MSG_GETTABLE] = {
6064 .call_rcu = nf_tables_gettable,
6065 .attr_count = NFTA_TABLE_MAX,
6066 .policy = nft_table_policy,
6068 [NFT_MSG_DELTABLE] = {
6069 .call_batch = nf_tables_deltable,
6070 .attr_count = NFTA_TABLE_MAX,
6071 .policy = nft_table_policy,
6073 [NFT_MSG_NEWCHAIN] = {
6074 .call_batch = nf_tables_newchain,
6075 .attr_count = NFTA_CHAIN_MAX,
6076 .policy = nft_chain_policy,
6078 [NFT_MSG_GETCHAIN] = {
6079 .call_rcu = nf_tables_getchain,
6080 .attr_count = NFTA_CHAIN_MAX,
6081 .policy = nft_chain_policy,
6083 [NFT_MSG_DELCHAIN] = {
6084 .call_batch = nf_tables_delchain,
6085 .attr_count = NFTA_CHAIN_MAX,
6086 .policy = nft_chain_policy,
6088 [NFT_MSG_NEWRULE] = {
6089 .call_batch = nf_tables_newrule,
6090 .attr_count = NFTA_RULE_MAX,
6091 .policy = nft_rule_policy,
6093 [NFT_MSG_GETRULE] = {
6094 .call_rcu = nf_tables_getrule,
6095 .attr_count = NFTA_RULE_MAX,
6096 .policy = nft_rule_policy,
6098 [NFT_MSG_DELRULE] = {
6099 .call_batch = nf_tables_delrule,
6100 .attr_count = NFTA_RULE_MAX,
6101 .policy = nft_rule_policy,
6103 [NFT_MSG_NEWSET] = {
6104 .call_batch = nf_tables_newset,
6105 .attr_count = NFTA_SET_MAX,
6106 .policy = nft_set_policy,
6108 [NFT_MSG_GETSET] = {
6109 .call_rcu = nf_tables_getset,
6110 .attr_count = NFTA_SET_MAX,
6111 .policy = nft_set_policy,
6113 [NFT_MSG_DELSET] = {
6114 .call_batch = nf_tables_delset,
6115 .attr_count = NFTA_SET_MAX,
6116 .policy = nft_set_policy,
6118 [NFT_MSG_NEWSETELEM] = {
6119 .call_batch = nf_tables_newsetelem,
6120 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6121 .policy = nft_set_elem_list_policy,
6123 [NFT_MSG_GETSETELEM] = {
6124 .call_rcu = nf_tables_getsetelem,
6125 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6126 .policy = nft_set_elem_list_policy,
6128 [NFT_MSG_DELSETELEM] = {
6129 .call_batch = nf_tables_delsetelem,
6130 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6131 .policy = nft_set_elem_list_policy,
6133 [NFT_MSG_GETGEN] = {
6134 .call_rcu = nf_tables_getgen,
6136 [NFT_MSG_NEWOBJ] = {
6137 .call_batch = nf_tables_newobj,
6138 .attr_count = NFTA_OBJ_MAX,
6139 .policy = nft_obj_policy,
6141 [NFT_MSG_GETOBJ] = {
6142 .call_rcu = nf_tables_getobj,
6143 .attr_count = NFTA_OBJ_MAX,
6144 .policy = nft_obj_policy,
6146 [NFT_MSG_DELOBJ] = {
6147 .call_batch = nf_tables_delobj,
6148 .attr_count = NFTA_OBJ_MAX,
6149 .policy = nft_obj_policy,
6151 [NFT_MSG_GETOBJ_RESET] = {
6152 .call_rcu = nf_tables_getobj,
6153 .attr_count = NFTA_OBJ_MAX,
6154 .policy = nft_obj_policy,
6156 [NFT_MSG_NEWFLOWTABLE] = {
6157 .call_batch = nf_tables_newflowtable,
6158 .attr_count = NFTA_FLOWTABLE_MAX,
6159 .policy = nft_flowtable_policy,
6161 [NFT_MSG_GETFLOWTABLE] = {
6162 .call_rcu = nf_tables_getflowtable,
6163 .attr_count = NFTA_FLOWTABLE_MAX,
6164 .policy = nft_flowtable_policy,
6166 [NFT_MSG_DELFLOWTABLE] = {
6167 .call_batch = nf_tables_delflowtable,
6168 .attr_count = NFTA_FLOWTABLE_MAX,
6169 .policy = nft_flowtable_policy,
6173 static int nf_tables_validate(struct net *net)
6175 struct nft_table *table;
6177 switch (net->nft.validate_state) {
6178 case NFT_VALIDATE_SKIP:
6180 case NFT_VALIDATE_NEED:
6181 nft_validate_state_update(net, NFT_VALIDATE_DO);
6183 case NFT_VALIDATE_DO:
6184 list_for_each_entry(table, &net->nft.tables, list) {
6185 if (nft_table_validate(net, table) < 0)
6194 static void nft_chain_commit_update(struct nft_trans *trans)
6196 struct nft_base_chain *basechain;
6198 if (nft_trans_chain_name(trans)) {
6199 rhltable_remove(&trans->ctx.table->chains_ht,
6200 &trans->ctx.chain->rhlhead,
6201 nft_chain_ht_params);
6202 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
6203 rhltable_insert_key(&trans->ctx.table->chains_ht,
6204 trans->ctx.chain->name,
6205 &trans->ctx.chain->rhlhead,
6206 nft_chain_ht_params);
6209 if (!nft_is_base_chain(trans->ctx.chain))
6212 basechain = nft_base_chain(trans->ctx.chain);
6213 nft_chain_stats_replace(trans->ctx.net, basechain,
6214 nft_trans_chain_stats(trans));
6216 switch (nft_trans_chain_policy(trans)) {
6219 basechain->policy = nft_trans_chain_policy(trans);
6224 static void nft_commit_release(struct nft_trans *trans)
6226 switch (trans->msg_type) {
6227 case NFT_MSG_DELTABLE:
6228 nf_tables_table_destroy(&trans->ctx);
6230 case NFT_MSG_NEWCHAIN:
6231 kfree(nft_trans_chain_name(trans));
6233 case NFT_MSG_DELCHAIN:
6234 nf_tables_chain_destroy(&trans->ctx);
6236 case NFT_MSG_DELRULE:
6237 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6239 case NFT_MSG_DELSET:
6240 nft_set_destroy(nft_trans_set(trans));
6242 case NFT_MSG_DELSETELEM:
6243 nf_tables_set_elem_destroy(&trans->ctx,
6244 nft_trans_elem_set(trans),
6245 nft_trans_elem(trans).priv);
6247 case NFT_MSG_DELOBJ:
6248 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6250 case NFT_MSG_DELFLOWTABLE:
6251 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6256 put_net(trans->ctx.net);
6261 static void nf_tables_trans_destroy_work(struct work_struct *w)
6263 struct nft_trans *trans, *next;
6266 spin_lock(&nf_tables_destroy_list_lock);
6267 list_splice_init(&nf_tables_destroy_list, &head);
6268 spin_unlock(&nf_tables_destroy_list_lock);
6270 if (list_empty(&head))
6275 list_for_each_entry_safe(trans, next, &head, list) {
6276 list_del(&trans->list);
6277 nft_commit_release(trans);
6281 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
6283 struct nft_rule *rule;
6284 unsigned int alloc = 0;
6287 /* already handled or inactive chain? */
6288 if (chain->rules_next || !nft_is_active_next(net, chain))
6291 rule = list_entry(&chain->rules, struct nft_rule, list);
6294 list_for_each_entry_continue(rule, &chain->rules, list) {
6295 if (nft_is_active_next(net, rule))
6299 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
6300 if (!chain->rules_next)
6303 list_for_each_entry_continue(rule, &chain->rules, list) {
6304 if (nft_is_active_next(net, rule))
6305 chain->rules_next[i++] = rule;
6308 chain->rules_next[i] = NULL;
6312 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
6314 struct nft_trans *trans, *next;
6316 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6317 struct nft_chain *chain = trans->ctx.chain;
6319 if (trans->msg_type == NFT_MSG_NEWRULE ||
6320 trans->msg_type == NFT_MSG_DELRULE) {
6321 kvfree(chain->rules_next);
6322 chain->rules_next = NULL;
6327 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
6329 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
6334 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
6336 struct nft_rule **r = rules;
6337 struct nft_rules_old *old;
6342 r++; /* rcu_head is after end marker */
6346 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
6349 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
6351 struct nft_rule **g0, **g1;
6354 next_genbit = nft_gencursor_next(net);
6356 g0 = rcu_dereference_protected(chain->rules_gen_0,
6357 lockdep_commit_lock_is_held(net));
6358 g1 = rcu_dereference_protected(chain->rules_gen_1,
6359 lockdep_commit_lock_is_held(net));
6361 /* No changes to this chain? */
6362 if (chain->rules_next == NULL) {
6363 /* chain had no change in last or next generation */
6367 * chain had no change in this generation; make sure next
6368 * one uses same rules as current generation.
6371 rcu_assign_pointer(chain->rules_gen_1, g0);
6372 nf_tables_commit_chain_free_rules_old(g1);
6374 rcu_assign_pointer(chain->rules_gen_0, g1);
6375 nf_tables_commit_chain_free_rules_old(g0);
6382 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
6384 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
6386 chain->rules_next = NULL;
6392 nf_tables_commit_chain_free_rules_old(g1);
6394 nf_tables_commit_chain_free_rules_old(g0);
6397 static void nft_chain_del(struct nft_chain *chain)
6399 struct nft_table *table = chain->table;
6401 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
6402 nft_chain_ht_params));
6403 list_del_rcu(&chain->list);
6406 static void nf_tables_commit_release(struct net *net)
6408 struct nft_trans *trans;
6410 /* all side effects have to be made visible.
6411 * For example, if a chain named 'foo' has been deleted, a
6412 * new transaction must not find it anymore.
6414 * Memory reclaim happens asynchronously from work queue
6415 * to prevent expensive synchronize_rcu() in commit phase.
6417 if (list_empty(&net->nft.commit_list)) {
6418 mutex_unlock(&net->nft.commit_mutex);
6422 trans = list_last_entry(&net->nft.commit_list,
6423 struct nft_trans, list);
6424 get_net(trans->ctx.net);
6425 WARN_ON_ONCE(trans->put_net);
6427 trans->put_net = true;
6428 spin_lock(&nf_tables_destroy_list_lock);
6429 list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
6430 spin_unlock(&nf_tables_destroy_list_lock);
6432 mutex_unlock(&net->nft.commit_mutex);
6434 schedule_work(&trans_destroy_work);
6437 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
6439 struct nft_trans *trans, *next;
6440 struct nft_trans_elem *te;
6441 struct nft_chain *chain;
6442 struct nft_table *table;
6444 /* 0. Validate ruleset, otherwise roll back for error reporting. */
6445 if (nf_tables_validate(net) < 0)
6448 /* 1. Allocate space for next generation rules_gen_X[] */
6449 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6452 if (trans->msg_type == NFT_MSG_NEWRULE ||
6453 trans->msg_type == NFT_MSG_DELRULE) {
6454 chain = trans->ctx.chain;
6456 ret = nf_tables_commit_chain_prepare(net, chain);
6458 nf_tables_commit_chain_prepare_cancel(net);
6464 /* step 2. Make rules_gen_X visible to packet path */
6465 list_for_each_entry(table, &net->nft.tables, list) {
6466 list_for_each_entry(chain, &table->chains, list)
6467 nf_tables_commit_chain(net, chain);
6471 * Bump generation counter, invalidate any dump in progress.
6472 * Cannot fail after this point.
6474 while (++net->nft.base_seq == 0);
6476 /* step 3. Start new generation, rules_gen_X now in use. */
6477 net->nft.gencursor = nft_gencursor_next(net);
6479 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6480 switch (trans->msg_type) {
6481 case NFT_MSG_NEWTABLE:
6482 if (nft_trans_table_update(trans)) {
6483 if (!nft_trans_table_enable(trans)) {
6484 nf_tables_table_disable(net,
6486 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6489 nft_clear(net, trans->ctx.table);
6491 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
6492 nft_trans_destroy(trans);
6494 case NFT_MSG_DELTABLE:
6495 list_del_rcu(&trans->ctx.table->list);
6496 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
6498 case NFT_MSG_NEWCHAIN:
6499 if (nft_trans_chain_update(trans)) {
6500 nft_chain_commit_update(trans);
6501 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6502 /* trans destroyed after rcu grace period */
6504 nft_clear(net, trans->ctx.chain);
6505 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6506 nft_trans_destroy(trans);
6509 case NFT_MSG_DELCHAIN:
6510 nft_chain_del(trans->ctx.chain);
6511 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
6512 nf_tables_unregister_hook(trans->ctx.net,
6516 case NFT_MSG_NEWRULE:
6517 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6518 nf_tables_rule_notify(&trans->ctx,
6519 nft_trans_rule(trans),
6521 nft_trans_destroy(trans);
6523 case NFT_MSG_DELRULE:
6524 list_del_rcu(&nft_trans_rule(trans)->list);
6525 nf_tables_rule_notify(&trans->ctx,
6526 nft_trans_rule(trans),
6528 nft_rule_expr_deactivate(&trans->ctx,
6529 nft_trans_rule(trans),
6532 case NFT_MSG_NEWSET:
6533 nft_clear(net, nft_trans_set(trans));
6534 /* This avoids hitting -EBUSY when deleting the table
6535 * from the transaction.
6537 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
6538 !list_empty(&nft_trans_set(trans)->bindings))
6539 trans->ctx.table->use--;
6541 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6542 NFT_MSG_NEWSET, GFP_KERNEL);
6543 nft_trans_destroy(trans);
6545 case NFT_MSG_DELSET:
6546 list_del_rcu(&nft_trans_set(trans)->list);
6547 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6548 NFT_MSG_DELSET, GFP_KERNEL);
6550 case NFT_MSG_NEWSETELEM:
6551 te = (struct nft_trans_elem *)trans->data;
6553 te->set->ops->activate(net, te->set, &te->elem);
6554 nf_tables_setelem_notify(&trans->ctx, te->set,
6556 NFT_MSG_NEWSETELEM, 0);
6557 nft_trans_destroy(trans);
6559 case NFT_MSG_DELSETELEM:
6560 te = (struct nft_trans_elem *)trans->data;
6562 nf_tables_setelem_notify(&trans->ctx, te->set,
6564 NFT_MSG_DELSETELEM, 0);
6565 te->set->ops->remove(net, te->set, &te->elem);
6566 atomic_dec(&te->set->nelems);
6569 case NFT_MSG_NEWOBJ:
6570 nft_clear(net, nft_trans_obj(trans));
6571 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6573 nft_trans_destroy(trans);
6575 case NFT_MSG_DELOBJ:
6576 list_del_rcu(&nft_trans_obj(trans)->list);
6577 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6580 case NFT_MSG_NEWFLOWTABLE:
6581 nft_clear(net, nft_trans_flowtable(trans));
6582 nf_tables_flowtable_notify(&trans->ctx,
6583 nft_trans_flowtable(trans),
6584 NFT_MSG_NEWFLOWTABLE);
6585 nft_trans_destroy(trans);
6587 case NFT_MSG_DELFLOWTABLE:
6588 list_del_rcu(&nft_trans_flowtable(trans)->list);
6589 nf_tables_flowtable_notify(&trans->ctx,
6590 nft_trans_flowtable(trans),
6591 NFT_MSG_DELFLOWTABLE);
6592 nft_unregister_flowtable_net_hooks(net,
6593 nft_trans_flowtable(trans));
6598 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
6599 nf_tables_commit_release(net);
6604 static void nf_tables_abort_release(struct nft_trans *trans)
6606 switch (trans->msg_type) {
6607 case NFT_MSG_NEWTABLE:
6608 nf_tables_table_destroy(&trans->ctx);
6610 case NFT_MSG_NEWCHAIN:
6611 nf_tables_chain_destroy(&trans->ctx);
6613 case NFT_MSG_NEWRULE:
6614 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6616 case NFT_MSG_NEWSET:
6617 if (!nft_trans_set_bound(trans))
6618 nft_set_destroy(nft_trans_set(trans));
6620 case NFT_MSG_NEWSETELEM:
6621 nft_set_elem_destroy(nft_trans_elem_set(trans),
6622 nft_trans_elem(trans).priv, true);
6624 case NFT_MSG_NEWOBJ:
6625 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6627 case NFT_MSG_NEWFLOWTABLE:
6628 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6634 static int __nf_tables_abort(struct net *net)
6636 struct nft_trans *trans, *next;
6637 struct nft_trans_elem *te;
6639 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
6641 switch (trans->msg_type) {
6642 case NFT_MSG_NEWTABLE:
6643 if (nft_trans_table_update(trans)) {
6644 if (nft_trans_table_enable(trans)) {
6645 nf_tables_table_disable(net,
6647 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6649 nft_trans_destroy(trans);
6651 list_del_rcu(&trans->ctx.table->list);
6654 case NFT_MSG_DELTABLE:
6655 nft_clear(trans->ctx.net, trans->ctx.table);
6656 nft_trans_destroy(trans);
6658 case NFT_MSG_NEWCHAIN:
6659 if (nft_trans_chain_update(trans)) {
6660 free_percpu(nft_trans_chain_stats(trans));
6661 kfree(nft_trans_chain_name(trans));
6662 nft_trans_destroy(trans);
6664 trans->ctx.table->use--;
6665 nft_chain_del(trans->ctx.chain);
6666 nf_tables_unregister_hook(trans->ctx.net,
6671 case NFT_MSG_DELCHAIN:
6672 trans->ctx.table->use++;
6673 nft_clear(trans->ctx.net, trans->ctx.chain);
6674 nft_trans_destroy(trans);
6676 case NFT_MSG_NEWRULE:
6677 trans->ctx.chain->use--;
6678 list_del_rcu(&nft_trans_rule(trans)->list);
6679 nft_rule_expr_deactivate(&trans->ctx,
6680 nft_trans_rule(trans),
6683 case NFT_MSG_DELRULE:
6684 trans->ctx.chain->use++;
6685 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6686 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
6687 nft_trans_destroy(trans);
6689 case NFT_MSG_NEWSET:
6690 trans->ctx.table->use--;
6691 if (!nft_trans_set_bound(trans))
6692 list_del_rcu(&nft_trans_set(trans)->list);
6694 case NFT_MSG_DELSET:
6695 trans->ctx.table->use++;
6696 nft_clear(trans->ctx.net, nft_trans_set(trans));
6697 nft_trans_destroy(trans);
6699 case NFT_MSG_NEWSETELEM:
6700 te = (struct nft_trans_elem *)trans->data;
6702 te->set->ops->remove(net, te->set, &te->elem);
6703 atomic_dec(&te->set->nelems);
6705 case NFT_MSG_DELSETELEM:
6706 te = (struct nft_trans_elem *)trans->data;
6708 nft_set_elem_activate(net, te->set, &te->elem);
6709 te->set->ops->activate(net, te->set, &te->elem);
6712 nft_trans_destroy(trans);
6714 case NFT_MSG_NEWOBJ:
6715 trans->ctx.table->use--;
6716 list_del_rcu(&nft_trans_obj(trans)->list);
6718 case NFT_MSG_DELOBJ:
6719 trans->ctx.table->use++;
6720 nft_clear(trans->ctx.net, nft_trans_obj(trans));
6721 nft_trans_destroy(trans);
6723 case NFT_MSG_NEWFLOWTABLE:
6724 trans->ctx.table->use--;
6725 list_del_rcu(&nft_trans_flowtable(trans)->list);
6726 nft_unregister_flowtable_net_hooks(net,
6727 nft_trans_flowtable(trans));
6729 case NFT_MSG_DELFLOWTABLE:
6730 trans->ctx.table->use++;
6731 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
6732 nft_trans_destroy(trans);
6739 list_for_each_entry_safe_reverse(trans, next,
6740 &net->nft.commit_list, list) {
6741 list_del(&trans->list);
6742 nf_tables_abort_release(trans);
6748 static void nf_tables_cleanup(struct net *net)
6750 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
6753 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
6755 int ret = __nf_tables_abort(net);
6757 mutex_unlock(&net->nft.commit_mutex);
6762 static bool nf_tables_valid_genid(struct net *net, u32 genid)
6766 mutex_lock(&net->nft.commit_mutex);
6768 genid_ok = genid == 0 || net->nft.base_seq == genid;
6770 mutex_unlock(&net->nft.commit_mutex);
6772 /* else, commit mutex has to be released by commit or abort function */
6776 static const struct nfnetlink_subsystem nf_tables_subsys = {
6777 .name = "nf_tables",
6778 .subsys_id = NFNL_SUBSYS_NFTABLES,
6779 .cb_count = NFT_MSG_MAX,
6781 .commit = nf_tables_commit,
6782 .abort = nf_tables_abort,
6783 .cleanup = nf_tables_cleanup,
6784 .valid_genid = nf_tables_valid_genid,
6785 .owner = THIS_MODULE,
6788 int nft_chain_validate_dependency(const struct nft_chain *chain,
6789 enum nft_chain_types type)
6791 const struct nft_base_chain *basechain;
6793 if (nft_is_base_chain(chain)) {
6794 basechain = nft_base_chain(chain);
6795 if (basechain->type->type != type)
6800 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
6802 int nft_chain_validate_hooks(const struct nft_chain *chain,
6803 unsigned int hook_flags)
6805 struct nft_base_chain *basechain;
6807 if (nft_is_base_chain(chain)) {
6808 basechain = nft_base_chain(chain);
6810 if ((1 << basechain->ops.hooknum) & hook_flags)
6818 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
6821 * Loop detection - walk through the ruleset beginning at the destination chain
6822 * of a new jump until either the source chain is reached (loop) or all
6823 * reachable chains have been traversed.
6825 * The loop check is performed whenever a new jump verdict is added to an
6826 * expression or verdict map or a verdict map is bound to a new chain.
6829 static int nf_tables_check_loops(const struct nft_ctx *ctx,
6830 const struct nft_chain *chain);
6832 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
6833 struct nft_set *set,
6834 const struct nft_set_iter *iter,
6835 struct nft_set_elem *elem)
6837 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6838 const struct nft_data *data;
6840 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6841 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
6844 data = nft_set_ext_data(ext);
6845 switch (data->verdict.code) {
6848 return nf_tables_check_loops(ctx, data->verdict.chain);
6854 static int nf_tables_check_loops(const struct nft_ctx *ctx,
6855 const struct nft_chain *chain)
6857 const struct nft_rule *rule;
6858 const struct nft_expr *expr, *last;
6859 struct nft_set *set;
6860 struct nft_set_binding *binding;
6861 struct nft_set_iter iter;
6863 if (ctx->chain == chain)
6866 list_for_each_entry(rule, &chain->rules, list) {
6867 nft_rule_for_each_expr(expr, last, rule) {
6868 struct nft_immediate_expr *priv;
6869 const struct nft_data *data;
6872 if (strcmp(expr->ops->type->name, "immediate"))
6875 priv = nft_expr_priv(expr);
6876 if (priv->dreg != NFT_REG_VERDICT)
6880 switch (data->verdict.code) {
6883 err = nf_tables_check_loops(ctx,
6884 data->verdict.chain);
6893 list_for_each_entry(set, &ctx->table->sets, list) {
6894 if (!nft_is_active_next(ctx->net, set))
6896 if (!(set->flags & NFT_SET_MAP) ||
6897 set->dtype != NFT_DATA_VERDICT)
6900 list_for_each_entry(binding, &set->bindings, list) {
6901 if (!(binding->flags & NFT_SET_MAP) ||
6902 binding->chain != chain)
6905 iter.genmask = nft_genmask_next(ctx->net);
6909 iter.fn = nf_tables_loop_check_setelem;
6911 set->ops->walk(ctx, set, &iter);
6921 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
6923 * @attr: netlink attribute to fetch value from
6924 * @max: maximum value to be stored in dest
6925 * @dest: pointer to the variable
6927 * Parse, check and store a given u32 netlink attribute into variable.
6928 * This function returns -ERANGE if the value goes over maximum value.
6929 * Otherwise a 0 is returned and the attribute value is stored in the
6930 * destination variable.
6932 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
6936 val = ntohl(nla_get_be32(attr));
6943 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
6946 * nft_parse_register - parse a register value from a netlink attribute
6948 * @attr: netlink attribute
6950 * Parse and translate a register value from a netlink attribute.
6951 * Registers used to be 128 bit wide, these register numbers will be
6952 * mapped to the corresponding 32 bit register numbers.
6954 unsigned int nft_parse_register(const struct nlattr *attr)
6958 reg = ntohl(nla_get_be32(attr));
6960 case NFT_REG_VERDICT...NFT_REG_4:
6961 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
6963 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
6966 EXPORT_SYMBOL_GPL(nft_parse_register);
6969 * nft_dump_register - dump a register value to a netlink attribute
6971 * @skb: socket buffer
6972 * @attr: attribute number
6973 * @reg: register number
6975 * Construct a netlink attribute containing the register number. For
6976 * compatibility reasons, register numbers being a multiple of 4 are
6977 * translated to the corresponding 128 bit register numbers.
6979 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
6981 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
6982 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
6984 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
6986 return nla_put_be32(skb, attr, htonl(reg));
6988 EXPORT_SYMBOL_GPL(nft_dump_register);
6991 * nft_validate_register_load - validate a load from a register
6993 * @reg: the register number
6994 * @len: the length of the data
6996 * Validate that the input register is one of the general purpose
6997 * registers and that the length of the load is within the bounds.
6999 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
7001 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7005 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
7010 EXPORT_SYMBOL_GPL(nft_validate_register_load);
7013 * nft_validate_register_store - validate an expressions' register store
7015 * @ctx: context of the expression performing the load
7016 * @reg: the destination register number
7017 * @data: the data to load
7018 * @type: the data type
7019 * @len: the length of the data
7021 * Validate that a data load uses the appropriate data type for
7022 * the destination register and the length is within the bounds.
7023 * A value of NULL for the data means that its runtime gathered
7026 int nft_validate_register_store(const struct nft_ctx *ctx,
7027 enum nft_registers reg,
7028 const struct nft_data *data,
7029 enum nft_data_types type, unsigned int len)
7034 case NFT_REG_VERDICT:
7035 if (type != NFT_DATA_VERDICT)
7039 (data->verdict.code == NFT_GOTO ||
7040 data->verdict.code == NFT_JUMP)) {
7041 err = nf_tables_check_loops(ctx, data->verdict.chain);
7048 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7052 if (reg * NFT_REG32_SIZE + len >
7053 FIELD_SIZEOF(struct nft_regs, data))
7056 if (data != NULL && type != NFT_DATA_VALUE)
7061 EXPORT_SYMBOL_GPL(nft_validate_register_store);
7063 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
7064 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
7065 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
7066 .len = NFT_CHAIN_MAXNAMELEN - 1 },
7069 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
7070 struct nft_data_desc *desc, const struct nlattr *nla)
7072 u8 genmask = nft_genmask_next(ctx->net);
7073 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
7074 struct nft_chain *chain;
7077 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
7082 if (!tb[NFTA_VERDICT_CODE])
7084 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
7086 switch (data->verdict.code) {
7088 switch (data->verdict.code & NF_VERDICT_MASK) {
7103 if (!tb[NFTA_VERDICT_CHAIN])
7105 chain = nft_chain_lookup(ctx->net, ctx->table,
7106 tb[NFTA_VERDICT_CHAIN], genmask);
7108 return PTR_ERR(chain);
7109 if (nft_is_base_chain(chain))
7113 data->verdict.chain = chain;
7117 desc->len = sizeof(data->verdict);
7118 desc->type = NFT_DATA_VERDICT;
7122 static void nft_verdict_uninit(const struct nft_data *data)
7124 switch (data->verdict.code) {
7127 data->verdict.chain->use--;
7132 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
7134 struct nlattr *nest;
7136 nest = nla_nest_start(skb, type);
7138 goto nla_put_failure;
7140 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
7141 goto nla_put_failure;
7146 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
7148 goto nla_put_failure;
7150 nla_nest_end(skb, nest);
7157 static int nft_value_init(const struct nft_ctx *ctx,
7158 struct nft_data *data, unsigned int size,
7159 struct nft_data_desc *desc, const struct nlattr *nla)
7169 nla_memcpy(data->data, nla, len);
7170 desc->type = NFT_DATA_VALUE;
7175 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
7178 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
7181 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
7182 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
7183 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
7187 * nft_data_init - parse nf_tables data netlink attributes
7189 * @ctx: context of the expression using the data
7190 * @data: destination struct nft_data
7191 * @size: maximum data length
7192 * @desc: data description
7193 * @nla: netlink attribute containing data
7195 * Parse the netlink data attributes and initialize a struct nft_data.
7196 * The type and length of data are returned in the data description.
7198 * The caller can indicate that it only wants to accept data of type
7199 * NFT_DATA_VALUE by passing NULL for the ctx argument.
7201 int nft_data_init(const struct nft_ctx *ctx,
7202 struct nft_data *data, unsigned int size,
7203 struct nft_data_desc *desc, const struct nlattr *nla)
7205 struct nlattr *tb[NFTA_DATA_MAX + 1];
7208 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
7212 if (tb[NFTA_DATA_VALUE])
7213 return nft_value_init(ctx, data, size, desc,
7214 tb[NFTA_DATA_VALUE]);
7215 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
7216 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
7219 EXPORT_SYMBOL_GPL(nft_data_init);
7222 * nft_data_release - release a nft_data item
7224 * @data: struct nft_data to release
7225 * @type: type of data
7227 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7228 * all others need to be released by calling this function.
7230 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
7232 if (type < NFT_DATA_VERDICT)
7235 case NFT_DATA_VERDICT:
7236 return nft_verdict_uninit(data);
7241 EXPORT_SYMBOL_GPL(nft_data_release);
7243 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
7244 enum nft_data_types type, unsigned int len)
7246 struct nlattr *nest;
7249 nest = nla_nest_start(skb, attr);
7254 case NFT_DATA_VALUE:
7255 err = nft_value_dump(skb, data, len);
7257 case NFT_DATA_VERDICT:
7258 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
7265 nla_nest_end(skb, nest);
7268 EXPORT_SYMBOL_GPL(nft_data_dump);
7270 int __nft_release_basechain(struct nft_ctx *ctx)
7272 struct nft_rule *rule, *nr;
7274 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
7277 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
7278 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
7279 list_del(&rule->list);
7281 nf_tables_rule_release(ctx, rule);
7283 nft_chain_del(ctx->chain);
7285 nf_tables_chain_destroy(ctx);
7289 EXPORT_SYMBOL_GPL(__nft_release_basechain);
7291 static void __nft_release_tables(struct net *net)
7293 struct nft_flowtable *flowtable, *nf;
7294 struct nft_table *table, *nt;
7295 struct nft_chain *chain, *nc;
7296 struct nft_object *obj, *ne;
7297 struct nft_rule *rule, *nr;
7298 struct nft_set *set, *ns;
7299 struct nft_ctx ctx = {
7301 .family = NFPROTO_NETDEV,
7304 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
7305 ctx.family = table->family;
7307 list_for_each_entry(chain, &table->chains, list)
7308 nf_tables_unregister_hook(net, table, chain);
7309 /* No packets are walking on these chains anymore. */
7311 list_for_each_entry(chain, &table->chains, list) {
7313 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
7314 list_del(&rule->list);
7316 nf_tables_rule_release(&ctx, rule);
7319 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
7320 list_del(&flowtable->list);
7322 nf_tables_flowtable_destroy(flowtable);
7324 list_for_each_entry_safe(set, ns, &table->sets, list) {
7325 list_del(&set->list);
7327 nft_set_destroy(set);
7329 list_for_each_entry_safe(obj, ne, &table->objects, list) {
7330 list_del(&obj->list);
7332 nft_obj_destroy(&ctx, obj);
7334 list_for_each_entry_safe(chain, nc, &table->chains, list) {
7336 nft_chain_del(chain);
7338 nf_tables_chain_destroy(&ctx);
7340 list_del(&table->list);
7341 nf_tables_table_destroy(&ctx);
7345 static int __net_init nf_tables_init_net(struct net *net)
7347 INIT_LIST_HEAD(&net->nft.tables);
7348 INIT_LIST_HEAD(&net->nft.commit_list);
7349 mutex_init(&net->nft.commit_mutex);
7350 net->nft.base_seq = 1;
7351 net->nft.validate_state = NFT_VALIDATE_SKIP;
7356 static void __net_exit nf_tables_exit_net(struct net *net)
7358 mutex_lock(&net->nft.commit_mutex);
7359 if (!list_empty(&net->nft.commit_list))
7360 __nf_tables_abort(net);
7361 __nft_release_tables(net);
7362 mutex_unlock(&net->nft.commit_mutex);
7363 WARN_ON_ONCE(!list_empty(&net->nft.tables));
7366 static struct pernet_operations nf_tables_net_ops = {
7367 .init = nf_tables_init_net,
7368 .exit = nf_tables_exit_net,
7371 static int __init nf_tables_module_init(void)
7375 spin_lock_init(&nf_tables_destroy_list_lock);
7376 err = register_pernet_subsys(&nf_tables_net_ops);
7380 err = nft_chain_filter_init();
7384 err = nf_tables_core_module_init();
7388 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
7393 err = nfnetlink_subsys_register(&nf_tables_subsys);
7399 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7401 nf_tables_core_module_exit();
7403 nft_chain_filter_fini();
7405 unregister_pernet_subsys(&nf_tables_net_ops);
7409 static void __exit nf_tables_module_exit(void)
7411 nfnetlink_subsys_unregister(&nf_tables_subsys);
7412 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7413 nft_chain_filter_fini();
7414 unregister_pernet_subsys(&nf_tables_net_ops);
7415 cancel_work_sync(&trans_destroy_work);
7417 nf_tables_core_module_exit();
7420 module_init(nf_tables_module_init);
7421 module_exit(nf_tables_module_exit);
7423 MODULE_LICENSE("GPL");
7424 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
7425 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);