1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
5 * Development of this code funded by Astaro AG (http://www.astaro.com/)
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/list.h>
11 #include <linux/skbuff.h>
12 #include <linux/netlink.h>
13 #include <linux/vmalloc.h>
14 #include <linux/rhashtable.h>
15 #include <linux/netfilter.h>
16 #include <linux/netfilter/nfnetlink.h>
17 #include <linux/netfilter/nf_tables.h>
18 #include <net/netfilter/nf_flow_table.h>
19 #include <net/netfilter/nf_tables_core.h>
20 #include <net/netfilter/nf_tables.h>
21 #include <net/netfilter/nf_tables_offload.h>
22 #include <net/net_namespace.h>
25 static LIST_HEAD(nf_tables_expressions);
26 static LIST_HEAD(nf_tables_objects);
27 static LIST_HEAD(nf_tables_flowtables);
28 static LIST_HEAD(nf_tables_destroy_list);
29 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
30 static u64 table_handle;
33 NFT_VALIDATE_SKIP = 0,
38 static struct rhltable nft_objname_ht;
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 u32 nft_objname_hash(const void *data, u32 len, u32 seed);
45 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
46 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
48 static const struct rhashtable_params nft_chain_ht_params = {
49 .head_offset = offsetof(struct nft_chain, rhlhead),
50 .key_offset = offsetof(struct nft_chain, name),
51 .hashfn = nft_chain_hash,
52 .obj_hashfn = nft_chain_hash_obj,
53 .obj_cmpfn = nft_chain_hash_cmp,
54 .automatic_shrinking = true,
57 static const struct rhashtable_params nft_objname_ht_params = {
58 .head_offset = offsetof(struct nft_object, rhlhead),
59 .key_offset = offsetof(struct nft_object, key),
60 .hashfn = nft_objname_hash,
61 .obj_hashfn = nft_objname_hash_obj,
62 .obj_cmpfn = nft_objname_hash_cmp,
63 .automatic_shrinking = true,
66 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
68 switch (net->nft.validate_state) {
69 case NFT_VALIDATE_SKIP:
70 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
72 case NFT_VALIDATE_NEED:
75 if (new_validate_state == NFT_VALIDATE_NEED)
79 net->nft.validate_state = new_validate_state;
81 static void nf_tables_trans_destroy_work(struct work_struct *w);
82 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
84 static void nft_ctx_init(struct nft_ctx *ctx,
86 const struct sk_buff *skb,
87 const struct nlmsghdr *nlh,
89 struct nft_table *table,
90 struct nft_chain *chain,
91 const struct nlattr * const *nla)
99 ctx->portid = NETLINK_CB(skb).portid;
100 ctx->report = nlmsg_report(nlh);
101 ctx->flags = nlh->nlmsg_flags;
102 ctx->seq = nlh->nlmsg_seq;
105 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
106 int msg_type, u32 size, gfp_t gfp)
108 struct nft_trans *trans;
110 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
114 trans->msg_type = msg_type;
120 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
121 int msg_type, u32 size)
123 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
126 static void nft_trans_destroy(struct nft_trans *trans)
128 list_del(&trans->list);
132 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
134 struct net *net = ctx->net;
135 struct nft_trans *trans;
137 if (!nft_set_is_anonymous(set))
140 list_for_each_entry_reverse(trans, &net->nft.commit_list, list) {
141 switch (trans->msg_type) {
143 if (nft_trans_set(trans) == set)
144 nft_trans_set_bound(trans) = true;
146 case NFT_MSG_NEWSETELEM:
147 if (nft_trans_elem_set(trans) == set)
148 nft_trans_elem_set_bound(trans) = true;
154 static int nf_tables_register_hook(struct net *net,
155 const struct nft_table *table,
156 struct nft_chain *chain)
158 const struct nft_base_chain *basechain;
159 const struct nf_hook_ops *ops;
161 if (table->flags & NFT_TABLE_F_DORMANT ||
162 !nft_is_base_chain(chain))
165 basechain = nft_base_chain(chain);
166 ops = &basechain->ops;
168 if (basechain->type->ops_register)
169 return basechain->type->ops_register(net, ops);
171 return nf_register_net_hook(net, ops);
174 static void nf_tables_unregister_hook(struct net *net,
175 const struct nft_table *table,
176 struct nft_chain *chain)
178 const struct nft_base_chain *basechain;
179 const struct nf_hook_ops *ops;
181 if (table->flags & NFT_TABLE_F_DORMANT ||
182 !nft_is_base_chain(chain))
184 basechain = nft_base_chain(chain);
185 ops = &basechain->ops;
187 if (basechain->type->ops_unregister)
188 return basechain->type->ops_unregister(net, ops);
190 nf_unregister_net_hook(net, ops);
193 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
195 struct nft_trans *trans;
197 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
201 if (msg_type == NFT_MSG_NEWTABLE)
202 nft_activate_next(ctx->net, ctx->table);
204 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
208 static int nft_deltable(struct nft_ctx *ctx)
212 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
216 nft_deactivate_next(ctx->net, ctx->table);
220 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
222 struct nft_trans *trans;
224 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
226 return ERR_PTR(-ENOMEM);
228 if (msg_type == NFT_MSG_NEWCHAIN)
229 nft_activate_next(ctx->net, ctx->chain);
231 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
235 static int nft_delchain(struct nft_ctx *ctx)
237 struct nft_trans *trans;
239 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
241 return PTR_ERR(trans);
244 nft_deactivate_next(ctx->net, ctx->chain);
249 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
250 struct nft_rule *rule)
252 struct nft_expr *expr;
254 expr = nft_expr_first(rule);
255 while (expr != nft_expr_last(rule) && expr->ops) {
256 if (expr->ops->activate)
257 expr->ops->activate(ctx, expr);
259 expr = nft_expr_next(expr);
263 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
264 struct nft_rule *rule,
265 enum nft_trans_phase phase)
267 struct nft_expr *expr;
269 expr = nft_expr_first(rule);
270 while (expr != nft_expr_last(rule) && expr->ops) {
271 if (expr->ops->deactivate)
272 expr->ops->deactivate(ctx, expr, phase);
274 expr = nft_expr_next(expr);
279 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
281 /* You cannot delete the same rule twice */
282 if (nft_is_active_next(ctx->net, rule)) {
283 nft_deactivate_next(ctx->net, rule);
290 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
291 struct nft_rule *rule)
293 struct nft_trans *trans;
295 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
299 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
300 nft_trans_rule_id(trans) =
301 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
303 nft_trans_rule(trans) = rule;
304 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
309 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
311 struct nft_trans *trans;
314 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
318 err = nf_tables_delrule_deactivate(ctx, rule);
320 nft_trans_destroy(trans);
323 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
328 static int nft_delrule_by_chain(struct nft_ctx *ctx)
330 struct nft_rule *rule;
333 list_for_each_entry(rule, &ctx->chain->rules, list) {
334 if (!nft_is_active_next(ctx->net, rule))
337 err = nft_delrule(ctx, rule);
344 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
347 struct nft_trans *trans;
349 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
353 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
354 nft_trans_set_id(trans) =
355 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
356 nft_activate_next(ctx->net, set);
358 nft_trans_set(trans) = set;
359 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
364 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
368 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
372 nft_deactivate_next(ctx->net, set);
378 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
379 struct nft_object *obj)
381 struct nft_trans *trans;
383 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
387 if (msg_type == NFT_MSG_NEWOBJ)
388 nft_activate_next(ctx->net, obj);
390 nft_trans_obj(trans) = obj;
391 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
396 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
400 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
404 nft_deactivate_next(ctx->net, obj);
410 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
411 struct nft_flowtable *flowtable)
413 struct nft_trans *trans;
415 trans = nft_trans_alloc(ctx, msg_type,
416 sizeof(struct nft_trans_flowtable));
420 if (msg_type == NFT_MSG_NEWFLOWTABLE)
421 nft_activate_next(ctx->net, flowtable);
423 nft_trans_flowtable(trans) = flowtable;
424 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
429 static int nft_delflowtable(struct nft_ctx *ctx,
430 struct nft_flowtable *flowtable)
434 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
438 nft_deactivate_next(ctx->net, flowtable);
448 static struct nft_table *nft_table_lookup(const struct net *net,
449 const struct nlattr *nla,
450 u8 family, u8 genmask)
452 struct nft_table *table;
455 return ERR_PTR(-EINVAL);
457 list_for_each_entry_rcu(table, &net->nft.tables, list) {
458 if (!nla_strcmp(nla, table->name) &&
459 table->family == family &&
460 nft_active_genmask(table, genmask))
464 return ERR_PTR(-ENOENT);
467 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
468 const struct nlattr *nla,
471 struct nft_table *table;
473 list_for_each_entry(table, &net->nft.tables, list) {
474 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
475 nft_active_genmask(table, genmask))
479 return ERR_PTR(-ENOENT);
482 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
484 return ++table->hgenerator;
487 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
489 static const struct nft_chain_type *
490 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
494 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
495 if (chain_type[family][i] != NULL &&
496 !nla_strcmp(nla, chain_type[family][i]->name))
497 return chain_type[family][i];
503 * Loading a module requires dropping mutex that guards the
505 * We first need to abort any pending transactions as once
506 * mutex is unlocked a different client could start a new
507 * transaction. It must not see any 'future generation'
508 * changes * as these changes will never happen.
510 #ifdef CONFIG_MODULES
511 static int __nf_tables_abort(struct net *net);
513 static void nft_request_module(struct net *net, const char *fmt, ...)
515 char module_name[MODULE_NAME_LEN];
519 __nf_tables_abort(net);
522 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
524 if (WARN(ret >= MODULE_NAME_LEN, "truncated: '%s' (len %d)", module_name, ret))
527 mutex_unlock(&net->nft.commit_mutex);
528 request_module("%s", module_name);
529 mutex_lock(&net->nft.commit_mutex);
533 static void lockdep_nfnl_nft_mutex_not_held(void)
535 #ifdef CONFIG_PROVE_LOCKING
536 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
540 static const struct nft_chain_type *
541 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
542 u8 family, bool autoload)
544 const struct nft_chain_type *type;
546 type = __nf_tables_chain_type_lookup(nla, family);
550 lockdep_nfnl_nft_mutex_not_held();
551 #ifdef CONFIG_MODULES
553 nft_request_module(net, "nft-chain-%u-%.*s", family,
554 nla_len(nla), (const char *)nla_data(nla));
555 type = __nf_tables_chain_type_lookup(nla, family);
557 return ERR_PTR(-EAGAIN);
560 return ERR_PTR(-ENOENT);
563 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
564 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
565 .len = NFT_TABLE_MAXNAMELEN - 1 },
566 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
567 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
570 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
571 u32 portid, u32 seq, int event, u32 flags,
572 int family, const struct nft_table *table)
574 struct nlmsghdr *nlh;
575 struct nfgenmsg *nfmsg;
577 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
578 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
580 goto nla_put_failure;
582 nfmsg = nlmsg_data(nlh);
583 nfmsg->nfgen_family = family;
584 nfmsg->version = NFNETLINK_V0;
585 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
587 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
588 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
589 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
590 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
592 goto nla_put_failure;
598 nlmsg_trim(skb, nlh);
602 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
608 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
611 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
615 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
616 event, 0, ctx->family, ctx->table);
622 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
623 ctx->report, GFP_KERNEL);
626 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
629 static int nf_tables_dump_tables(struct sk_buff *skb,
630 struct netlink_callback *cb)
632 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
633 const struct nft_table *table;
634 unsigned int idx = 0, s_idx = cb->args[0];
635 struct net *net = sock_net(skb->sk);
636 int family = nfmsg->nfgen_family;
639 cb->seq = net->nft.base_seq;
641 list_for_each_entry_rcu(table, &net->nft.tables, list) {
642 if (family != NFPROTO_UNSPEC && family != table->family)
648 memset(&cb->args[1], 0,
649 sizeof(cb->args) - sizeof(cb->args[0]));
650 if (!nft_is_active(net, table))
652 if (nf_tables_fill_table_info(skb, net,
653 NETLINK_CB(cb->skb).portid,
655 NFT_MSG_NEWTABLE, NLM_F_MULTI,
656 table->family, table) < 0)
659 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
669 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
670 const struct nlmsghdr *nlh,
671 struct netlink_dump_control *c)
675 if (!try_module_get(THIS_MODULE))
679 err = netlink_dump_start(nlsk, skb, nlh, c);
681 module_put(THIS_MODULE);
686 /* called with rcu_read_lock held */
687 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
688 struct sk_buff *skb, const struct nlmsghdr *nlh,
689 const struct nlattr * const nla[],
690 struct netlink_ext_ack *extack)
692 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
693 u8 genmask = nft_genmask_cur(net);
694 const struct nft_table *table;
695 struct sk_buff *skb2;
696 int family = nfmsg->nfgen_family;
699 if (nlh->nlmsg_flags & NLM_F_DUMP) {
700 struct netlink_dump_control c = {
701 .dump = nf_tables_dump_tables,
702 .module = THIS_MODULE,
705 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
708 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
710 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
711 return PTR_ERR(table);
714 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
718 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
719 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
724 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
731 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
733 struct nft_chain *chain;
736 list_for_each_entry(chain, &table->chains, list) {
737 if (!nft_is_active_next(net, chain))
739 if (!nft_is_base_chain(chain))
742 if (cnt && i++ == cnt)
745 nf_unregister_net_hook(net, &nft_base_chain(chain)->ops);
749 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
751 struct nft_chain *chain;
754 list_for_each_entry(chain, &table->chains, list) {
755 if (!nft_is_active_next(net, chain))
757 if (!nft_is_base_chain(chain))
760 err = nf_register_net_hook(net, &nft_base_chain(chain)->ops);
769 nft_table_disable(net, table, i);
773 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
775 nft_table_disable(net, table, 0);
778 static int nf_tables_updtable(struct nft_ctx *ctx)
780 struct nft_trans *trans;
784 if (!ctx->nla[NFTA_TABLE_FLAGS])
787 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
788 if (flags & ~NFT_TABLE_F_DORMANT)
791 if (flags == ctx->table->flags)
794 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
795 sizeof(struct nft_trans_table));
799 if ((flags & NFT_TABLE_F_DORMANT) &&
800 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
801 nft_trans_table_enable(trans) = false;
802 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
803 ctx->table->flags & NFT_TABLE_F_DORMANT) {
804 ret = nf_tables_table_enable(ctx->net, ctx->table);
806 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
807 nft_trans_table_enable(trans) = true;
813 nft_trans_table_update(trans) = true;
814 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
817 nft_trans_destroy(trans);
821 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
823 const char *name = data;
825 return jhash(name, strlen(name), seed);
828 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
830 const struct nft_chain *chain = data;
832 return nft_chain_hash(chain->name, 0, seed);
835 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
838 const struct nft_chain *chain = ptr;
839 const char *name = arg->key;
841 return strcmp(chain->name, name);
844 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
846 const struct nft_object_hash_key *k = data;
848 seed ^= hash_ptr(k->table, 32);
850 return jhash(k->name, strlen(k->name), seed);
853 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
855 const struct nft_object *obj = data;
857 return nft_objname_hash(&obj->key, 0, seed);
860 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
863 const struct nft_object_hash_key *k = arg->key;
864 const struct nft_object *obj = ptr;
866 if (obj->key.table != k->table)
869 return strcmp(obj->key.name, k->name);
872 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
873 struct sk_buff *skb, const struct nlmsghdr *nlh,
874 const struct nlattr * const nla[],
875 struct netlink_ext_ack *extack)
877 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
878 u8 genmask = nft_genmask_next(net);
879 int family = nfmsg->nfgen_family;
880 const struct nlattr *attr;
881 struct nft_table *table;
886 lockdep_assert_held(&net->nft.commit_mutex);
887 attr = nla[NFTA_TABLE_NAME];
888 table = nft_table_lookup(net, attr, family, genmask);
890 if (PTR_ERR(table) != -ENOENT)
891 return PTR_ERR(table);
893 if (nlh->nlmsg_flags & NLM_F_EXCL) {
894 NL_SET_BAD_ATTR(extack, attr);
897 if (nlh->nlmsg_flags & NLM_F_REPLACE)
900 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
901 return nf_tables_updtable(&ctx);
904 if (nla[NFTA_TABLE_FLAGS]) {
905 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
906 if (flags & ~NFT_TABLE_F_DORMANT)
911 table = kzalloc(sizeof(*table), GFP_KERNEL);
915 table->name = nla_strdup(attr, GFP_KERNEL);
916 if (table->name == NULL)
919 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
923 INIT_LIST_HEAD(&table->chains);
924 INIT_LIST_HEAD(&table->sets);
925 INIT_LIST_HEAD(&table->objects);
926 INIT_LIST_HEAD(&table->flowtables);
927 table->family = family;
928 table->flags = flags;
929 table->handle = ++table_handle;
931 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
932 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
936 list_add_tail_rcu(&table->list, &net->nft.tables);
939 rhltable_destroy(&table->chains_ht);
948 static int nft_flush_table(struct nft_ctx *ctx)
950 struct nft_flowtable *flowtable, *nft;
951 struct nft_chain *chain, *nc;
952 struct nft_object *obj, *ne;
953 struct nft_set *set, *ns;
956 list_for_each_entry(chain, &ctx->table->chains, list) {
957 if (!nft_is_active_next(ctx->net, chain))
962 err = nft_delrule_by_chain(ctx);
967 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
968 if (!nft_is_active_next(ctx->net, set))
971 if (nft_set_is_anonymous(set) &&
972 !list_empty(&set->bindings))
975 err = nft_delset(ctx, set);
980 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
981 err = nft_delflowtable(ctx, flowtable);
986 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
987 err = nft_delobj(ctx, obj);
992 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
993 if (!nft_is_active_next(ctx->net, chain))
998 err = nft_delchain(ctx);
1003 err = nft_deltable(ctx);
1008 static int nft_flush(struct nft_ctx *ctx, int family)
1010 struct nft_table *table, *nt;
1011 const struct nlattr * const *nla = ctx->nla;
1014 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
1015 if (family != AF_UNSPEC && table->family != family)
1018 ctx->family = table->family;
1020 if (!nft_is_active_next(ctx->net, table))
1023 if (nla[NFTA_TABLE_NAME] &&
1024 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1029 err = nft_flush_table(ctx);
1037 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1038 struct sk_buff *skb, const struct nlmsghdr *nlh,
1039 const struct nlattr * const nla[],
1040 struct netlink_ext_ack *extack)
1042 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1043 u8 genmask = nft_genmask_next(net);
1044 int family = nfmsg->nfgen_family;
1045 const struct nlattr *attr;
1046 struct nft_table *table;
1049 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
1050 if (family == AF_UNSPEC ||
1051 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1052 return nft_flush(&ctx, family);
1054 if (nla[NFTA_TABLE_HANDLE]) {
1055 attr = nla[NFTA_TABLE_HANDLE];
1056 table = nft_table_lookup_byhandle(net, attr, genmask);
1058 attr = nla[NFTA_TABLE_NAME];
1059 table = nft_table_lookup(net, attr, family, genmask);
1062 if (IS_ERR(table)) {
1063 NL_SET_BAD_ATTR(extack, attr);
1064 return PTR_ERR(table);
1067 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1071 ctx.family = family;
1074 return nft_flush_table(&ctx);
1077 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1079 if (WARN_ON(ctx->table->use > 0))
1082 rhltable_destroy(&ctx->table->chains_ht);
1083 kfree(ctx->table->name);
1087 void nft_register_chain_type(const struct nft_chain_type *ctype)
1089 if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO))
1092 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1093 if (WARN_ON(chain_type[ctype->family][ctype->type] != NULL)) {
1094 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1097 chain_type[ctype->family][ctype->type] = ctype;
1098 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1100 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1102 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1104 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1105 chain_type[ctype->family][ctype->type] = NULL;
1106 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1108 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1114 static struct nft_chain *
1115 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1117 struct nft_chain *chain;
1119 list_for_each_entry(chain, &table->chains, list) {
1120 if (chain->handle == handle &&
1121 nft_active_genmask(chain, genmask))
1125 return ERR_PTR(-ENOENT);
1128 static bool lockdep_commit_lock_is_held(const struct net *net)
1130 #ifdef CONFIG_PROVE_LOCKING
1131 return lockdep_is_held(&net->nft.commit_mutex);
1137 static struct nft_chain *nft_chain_lookup(struct net *net,
1138 struct nft_table *table,
1139 const struct nlattr *nla, u8 genmask)
1141 char search[NFT_CHAIN_MAXNAMELEN + 1];
1142 struct rhlist_head *tmp, *list;
1143 struct nft_chain *chain;
1146 return ERR_PTR(-EINVAL);
1148 nla_strlcpy(search, nla, sizeof(search));
1150 WARN_ON(!rcu_read_lock_held() &&
1151 !lockdep_commit_lock_is_held(net));
1153 chain = ERR_PTR(-ENOENT);
1155 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1159 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1160 if (nft_active_genmask(chain, genmask))
1163 chain = ERR_PTR(-ENOENT);
1169 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1170 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1171 .len = NFT_TABLE_MAXNAMELEN - 1 },
1172 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1173 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1174 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1175 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1176 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1177 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
1178 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1179 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1182 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1183 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1184 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1185 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1186 .len = IFNAMSIZ - 1 },
1189 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1191 struct nft_stats *cpu_stats, total;
1192 struct nlattr *nest;
1200 memset(&total, 0, sizeof(total));
1201 for_each_possible_cpu(cpu) {
1202 cpu_stats = per_cpu_ptr(stats, cpu);
1204 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1205 pkts = cpu_stats->pkts;
1206 bytes = cpu_stats->bytes;
1207 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1209 total.bytes += bytes;
1211 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1213 goto nla_put_failure;
1215 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1216 NFTA_COUNTER_PAD) ||
1217 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1219 goto nla_put_failure;
1221 nla_nest_end(skb, nest);
1228 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1229 u32 portid, u32 seq, int event, u32 flags,
1230 int family, const struct nft_table *table,
1231 const struct nft_chain *chain)
1233 struct nlmsghdr *nlh;
1234 struct nfgenmsg *nfmsg;
1236 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1237 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1239 goto nla_put_failure;
1241 nfmsg = nlmsg_data(nlh);
1242 nfmsg->nfgen_family = family;
1243 nfmsg->version = NFNETLINK_V0;
1244 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1246 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1247 goto nla_put_failure;
1248 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1250 goto nla_put_failure;
1251 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1252 goto nla_put_failure;
1254 if (nft_is_base_chain(chain)) {
1255 const struct nft_base_chain *basechain = nft_base_chain(chain);
1256 const struct nf_hook_ops *ops = &basechain->ops;
1257 struct nft_stats __percpu *stats;
1258 struct nlattr *nest;
1260 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1262 goto nla_put_failure;
1263 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1264 goto nla_put_failure;
1265 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1266 goto nla_put_failure;
1267 if (basechain->dev_name[0] &&
1268 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1269 goto nla_put_failure;
1270 nla_nest_end(skb, nest);
1272 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1273 htonl(basechain->policy)))
1274 goto nla_put_failure;
1276 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1277 goto nla_put_failure;
1279 stats = rcu_dereference_check(basechain->stats,
1280 lockdep_commit_lock_is_held(net));
1281 if (nft_dump_stats(skb, stats))
1282 goto nla_put_failure;
1285 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1286 goto nla_put_failure;
1288 nlmsg_end(skb, nlh);
1292 nlmsg_trim(skb, nlh);
1296 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1298 struct sk_buff *skb;
1302 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1305 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1309 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1310 event, 0, ctx->family, ctx->table,
1317 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1318 ctx->report, GFP_KERNEL);
1321 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1324 static int nf_tables_dump_chains(struct sk_buff *skb,
1325 struct netlink_callback *cb)
1327 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1328 const struct nft_table *table;
1329 const struct nft_chain *chain;
1330 unsigned int idx = 0, s_idx = cb->args[0];
1331 struct net *net = sock_net(skb->sk);
1332 int family = nfmsg->nfgen_family;
1335 cb->seq = net->nft.base_seq;
1337 list_for_each_entry_rcu(table, &net->nft.tables, list) {
1338 if (family != NFPROTO_UNSPEC && family != table->family)
1341 list_for_each_entry_rcu(chain, &table->chains, list) {
1345 memset(&cb->args[1], 0,
1346 sizeof(cb->args) - sizeof(cb->args[0]));
1347 if (!nft_is_active(net, chain))
1349 if (nf_tables_fill_chain_info(skb, net,
1350 NETLINK_CB(cb->skb).portid,
1354 table->family, table,
1358 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1369 /* called with rcu_read_lock held */
1370 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1371 struct sk_buff *skb, const struct nlmsghdr *nlh,
1372 const struct nlattr * const nla[],
1373 struct netlink_ext_ack *extack)
1375 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1376 u8 genmask = nft_genmask_cur(net);
1377 const struct nft_chain *chain;
1378 struct nft_table *table;
1379 struct sk_buff *skb2;
1380 int family = nfmsg->nfgen_family;
1383 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1384 struct netlink_dump_control c = {
1385 .dump = nf_tables_dump_chains,
1386 .module = THIS_MODULE,
1389 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1392 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1393 if (IS_ERR(table)) {
1394 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1395 return PTR_ERR(table);
1398 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1399 if (IS_ERR(chain)) {
1400 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1401 return PTR_ERR(chain);
1404 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1408 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1409 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1410 family, table, chain);
1414 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1421 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1422 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1423 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1426 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1428 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1429 struct nft_stats __percpu *newstats;
1430 struct nft_stats *stats;
1433 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1434 nft_counter_policy, NULL);
1436 return ERR_PTR(err);
1438 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1439 return ERR_PTR(-EINVAL);
1441 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1442 if (newstats == NULL)
1443 return ERR_PTR(-ENOMEM);
1445 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1446 * are not exposed to userspace.
1449 stats = this_cpu_ptr(newstats);
1450 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1451 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1457 static void nft_chain_stats_replace(struct nft_trans *trans)
1459 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1461 if (!nft_trans_chain_stats(trans))
1464 rcu_swap_protected(chain->stats, nft_trans_chain_stats(trans),
1465 lockdep_commit_lock_is_held(trans->ctx.net));
1467 if (!nft_trans_chain_stats(trans))
1468 static_branch_inc(&nft_counters_enabled);
1471 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1473 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1474 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1480 /* should be NULL either via abort or via successful commit */
1481 WARN_ON_ONCE(chain->rules_next);
1482 kvfree(chain->rules_next);
1485 static void nf_tables_chain_destroy(struct nft_ctx *ctx)
1487 struct nft_chain *chain = ctx->chain;
1489 if (WARN_ON(chain->use > 0))
1492 /* no concurrent access possible anymore */
1493 nf_tables_chain_free_chain_rules(chain);
1495 if (nft_is_base_chain(chain)) {
1496 struct nft_base_chain *basechain = nft_base_chain(chain);
1498 module_put(basechain->type->owner);
1499 if (rcu_access_pointer(basechain->stats)) {
1500 static_branch_dec(&nft_counters_enabled);
1501 free_percpu(rcu_dereference_raw(basechain->stats));
1511 struct nft_chain_hook {
1514 const struct nft_chain_type *type;
1515 struct net_device *dev;
1518 static int nft_chain_parse_hook(struct net *net,
1519 const struct nlattr * const nla[],
1520 struct nft_chain_hook *hook, u8 family,
1523 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1524 const struct nft_chain_type *type;
1525 struct net_device *dev;
1528 lockdep_assert_held(&net->nft.commit_mutex);
1529 lockdep_nfnl_nft_mutex_not_held();
1531 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1532 nla[NFTA_CHAIN_HOOK],
1533 nft_hook_policy, NULL);
1537 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1538 ha[NFTA_HOOK_PRIORITY] == NULL)
1541 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1542 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1544 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1545 if (nla[NFTA_CHAIN_TYPE]) {
1546 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1549 return PTR_ERR(type);
1551 if (hook->num > NF_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1554 if (type->type == NFT_CHAIN_T_NAT &&
1555 hook->priority <= NF_IP_PRI_CONNTRACK)
1558 if (!try_module_get(type->owner))
1564 if (family == NFPROTO_NETDEV) {
1565 char ifname[IFNAMSIZ];
1567 if (!ha[NFTA_HOOK_DEV]) {
1568 module_put(type->owner);
1572 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1573 dev = __dev_get_by_name(net, ifname);
1575 module_put(type->owner);
1579 } else if (ha[NFTA_HOOK_DEV]) {
1580 module_put(type->owner);
1587 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1589 module_put(hook->type->owner);
1592 struct nft_rules_old {
1594 struct nft_rule **start;
1597 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1600 if (alloc > INT_MAX)
1603 alloc += 1; /* NULL, ends rules */
1604 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1607 alloc *= sizeof(struct nft_rule *);
1608 alloc += sizeof(struct nft_rules_old);
1610 return kvmalloc(alloc, GFP_KERNEL);
1613 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1614 u8 policy, u32 flags)
1616 const struct nlattr * const *nla = ctx->nla;
1617 struct nft_table *table = ctx->table;
1618 struct nft_base_chain *basechain;
1619 struct nft_stats __percpu *stats;
1620 struct net *net = ctx->net;
1621 struct nft_trans *trans;
1622 struct nft_chain *chain;
1623 struct nft_rule **rules;
1626 if (table->use == UINT_MAX)
1629 if (nla[NFTA_CHAIN_HOOK]) {
1630 struct nft_chain_hook hook;
1631 struct nf_hook_ops *ops;
1633 err = nft_chain_parse_hook(net, nla, &hook, family, true);
1637 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1638 if (basechain == NULL) {
1639 nft_chain_release_hook(&hook);
1643 if (hook.dev != NULL)
1644 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1646 if (nla[NFTA_CHAIN_COUNTERS]) {
1647 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1648 if (IS_ERR(stats)) {
1649 nft_chain_release_hook(&hook);
1651 return PTR_ERR(stats);
1653 rcu_assign_pointer(basechain->stats, stats);
1654 static_branch_inc(&nft_counters_enabled);
1657 basechain->type = hook.type;
1658 chain = &basechain->chain;
1660 ops = &basechain->ops;
1662 ops->hooknum = hook.num;
1663 ops->priority = hook.priority;
1665 ops->hook = hook.type->hooks[ops->hooknum];
1666 ops->dev = hook.dev;
1668 chain->flags |= NFT_BASE_CHAIN | flags;
1669 basechain->policy = NF_ACCEPT;
1670 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
1671 nft_chain_offload_priority(basechain) < 0)
1674 flow_block_init(&basechain->flow_block);
1676 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1682 INIT_LIST_HEAD(&chain->rules);
1683 chain->handle = nf_tables_alloc_handle(table);
1684 chain->table = table;
1685 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1691 rules = nf_tables_chain_alloc_rules(chain, 0);
1698 rcu_assign_pointer(chain->rules_gen_0, rules);
1699 rcu_assign_pointer(chain->rules_gen_1, rules);
1701 err = nf_tables_register_hook(net, table, chain);
1705 err = rhltable_insert_key(&table->chains_ht, chain->name,
1706 &chain->rhlhead, nft_chain_ht_params);
1710 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1711 if (IS_ERR(trans)) {
1712 err = PTR_ERR(trans);
1713 rhltable_remove(&table->chains_ht, &chain->rhlhead,
1714 nft_chain_ht_params);
1718 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
1719 if (nft_is_base_chain(chain))
1720 nft_trans_chain_policy(trans) = policy;
1723 list_add_tail_rcu(&chain->list, &table->chains);
1727 nf_tables_unregister_hook(net, table, chain);
1729 nf_tables_chain_destroy(ctx);
1734 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
1737 const struct nlattr * const *nla = ctx->nla;
1738 struct nft_table *table = ctx->table;
1739 struct nft_chain *chain = ctx->chain;
1740 struct nft_base_chain *basechain;
1741 struct nft_stats *stats = NULL;
1742 struct nft_chain_hook hook;
1743 struct nf_hook_ops *ops;
1744 struct nft_trans *trans;
1747 if (chain->flags ^ flags)
1750 if (nla[NFTA_CHAIN_HOOK]) {
1751 if (!nft_is_base_chain(chain))
1754 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
1759 basechain = nft_base_chain(chain);
1760 if (basechain->type != hook.type) {
1761 nft_chain_release_hook(&hook);
1765 ops = &basechain->ops;
1766 if (ops->hooknum != hook.num ||
1767 ops->priority != hook.priority ||
1768 ops->dev != hook.dev) {
1769 nft_chain_release_hook(&hook);
1772 nft_chain_release_hook(&hook);
1775 if (nla[NFTA_CHAIN_HANDLE] &&
1776 nla[NFTA_CHAIN_NAME]) {
1777 struct nft_chain *chain2;
1779 chain2 = nft_chain_lookup(ctx->net, table,
1780 nla[NFTA_CHAIN_NAME], genmask);
1781 if (!IS_ERR(chain2))
1785 if (nla[NFTA_CHAIN_COUNTERS]) {
1786 if (!nft_is_base_chain(chain))
1789 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1791 return PTR_ERR(stats);
1795 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
1796 sizeof(struct nft_trans_chain));
1800 nft_trans_chain_stats(trans) = stats;
1801 nft_trans_chain_update(trans) = true;
1803 if (nla[NFTA_CHAIN_POLICY])
1804 nft_trans_chain_policy(trans) = policy;
1806 nft_trans_chain_policy(trans) = -1;
1808 if (nla[NFTA_CHAIN_HANDLE] &&
1809 nla[NFTA_CHAIN_NAME]) {
1810 struct nft_trans *tmp;
1814 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1819 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
1820 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
1821 tmp->ctx.table == table &&
1822 nft_trans_chain_update(tmp) &&
1823 nft_trans_chain_name(tmp) &&
1824 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
1830 nft_trans_chain_name(trans) = name;
1832 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1841 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1842 struct sk_buff *skb, const struct nlmsghdr *nlh,
1843 const struct nlattr * const nla[],
1844 struct netlink_ext_ack *extack)
1846 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1847 u8 genmask = nft_genmask_next(net);
1848 int family = nfmsg->nfgen_family;
1849 const struct nlattr *attr;
1850 struct nft_table *table;
1851 struct nft_chain *chain;
1852 u8 policy = NF_ACCEPT;
1857 lockdep_assert_held(&net->nft.commit_mutex);
1859 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1860 if (IS_ERR(table)) {
1861 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1862 return PTR_ERR(table);
1866 attr = nla[NFTA_CHAIN_NAME];
1868 if (nla[NFTA_CHAIN_HANDLE]) {
1869 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1870 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1871 if (IS_ERR(chain)) {
1872 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
1873 return PTR_ERR(chain);
1875 attr = nla[NFTA_CHAIN_HANDLE];
1877 chain = nft_chain_lookup(net, table, attr, genmask);
1878 if (IS_ERR(chain)) {
1879 if (PTR_ERR(chain) != -ENOENT) {
1880 NL_SET_BAD_ATTR(extack, attr);
1881 return PTR_ERR(chain);
1887 if (nla[NFTA_CHAIN_POLICY]) {
1888 if (chain != NULL &&
1889 !nft_is_base_chain(chain)) {
1890 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1894 if (chain == NULL &&
1895 nla[NFTA_CHAIN_HOOK] == NULL) {
1896 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1900 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1910 if (nla[NFTA_CHAIN_FLAGS])
1911 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
1913 flags = chain->flags;
1915 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1917 if (chain != NULL) {
1918 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1919 NL_SET_BAD_ATTR(extack, attr);
1922 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1925 return nf_tables_updchain(&ctx, genmask, policy, flags);
1928 return nf_tables_addchain(&ctx, family, genmask, policy, flags);
1931 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1932 struct sk_buff *skb, const struct nlmsghdr *nlh,
1933 const struct nlattr * const nla[],
1934 struct netlink_ext_ack *extack)
1936 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1937 u8 genmask = nft_genmask_next(net);
1938 int family = nfmsg->nfgen_family;
1939 const struct nlattr *attr;
1940 struct nft_table *table;
1941 struct nft_chain *chain;
1942 struct nft_rule *rule;
1948 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1949 if (IS_ERR(table)) {
1950 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1951 return PTR_ERR(table);
1954 if (nla[NFTA_CHAIN_HANDLE]) {
1955 attr = nla[NFTA_CHAIN_HANDLE];
1956 handle = be64_to_cpu(nla_get_be64(attr));
1957 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1959 attr = nla[NFTA_CHAIN_NAME];
1960 chain = nft_chain_lookup(net, table, attr, genmask);
1962 if (IS_ERR(chain)) {
1963 NL_SET_BAD_ATTR(extack, attr);
1964 return PTR_ERR(chain);
1967 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1971 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1974 list_for_each_entry(rule, &chain->rules, list) {
1975 if (!nft_is_active_next(net, rule))
1979 err = nft_delrule(&ctx, rule);
1984 /* There are rules and elements that are still holding references to us,
1985 * we cannot do a recursive removal in this case.
1988 NL_SET_BAD_ATTR(extack, attr);
1992 return nft_delchain(&ctx);
2000 * nft_register_expr - register nf_tables expr type
2003 * Registers the expr type for use with nf_tables. Returns zero on
2004 * success or a negative errno code otherwise.
2006 int nft_register_expr(struct nft_expr_type *type)
2008 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2009 if (type->family == NFPROTO_UNSPEC)
2010 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2012 list_add_rcu(&type->list, &nf_tables_expressions);
2013 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2016 EXPORT_SYMBOL_GPL(nft_register_expr);
2019 * nft_unregister_expr - unregister nf_tables expr type
2022 * Unregisters the expr typefor use with nf_tables.
2024 void nft_unregister_expr(struct nft_expr_type *type)
2026 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2027 list_del_rcu(&type->list);
2028 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2030 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2032 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2035 const struct nft_expr_type *type, *candidate = NULL;
2037 list_for_each_entry(type, &nf_tables_expressions, list) {
2038 if (!nla_strcmp(nla, type->name)) {
2039 if (!type->family && !candidate)
2041 else if (type->family == family)
2048 #ifdef CONFIG_MODULES
2049 static int nft_expr_type_request_module(struct net *net, u8 family,
2052 nft_request_module(net, "nft-expr-%u-%.*s", family,
2053 nla_len(nla), (char *)nla_data(nla));
2054 if (__nft_expr_type_get(family, nla))
2061 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2065 const struct nft_expr_type *type;
2068 return ERR_PTR(-EINVAL);
2070 type = __nft_expr_type_get(family, nla);
2071 if (type != NULL && try_module_get(type->owner))
2074 lockdep_nfnl_nft_mutex_not_held();
2075 #ifdef CONFIG_MODULES
2077 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2078 return ERR_PTR(-EAGAIN);
2080 nft_request_module(net, "nft-expr-%.*s",
2081 nla_len(nla), (char *)nla_data(nla));
2082 if (__nft_expr_type_get(family, nla))
2083 return ERR_PTR(-EAGAIN);
2086 return ERR_PTR(-ENOENT);
2089 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2090 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
2091 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2094 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2095 const struct nft_expr *expr)
2097 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2098 goto nla_put_failure;
2100 if (expr->ops->dump) {
2101 struct nlattr *data = nla_nest_start_noflag(skb,
2104 goto nla_put_failure;
2105 if (expr->ops->dump(skb, expr) < 0)
2106 goto nla_put_failure;
2107 nla_nest_end(skb, data);
2116 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2117 const struct nft_expr *expr)
2119 struct nlattr *nest;
2121 nest = nla_nest_start_noflag(skb, attr);
2123 goto nla_put_failure;
2124 if (nf_tables_fill_expr_info(skb, expr) < 0)
2125 goto nla_put_failure;
2126 nla_nest_end(skb, nest);
2133 struct nft_expr_info {
2134 const struct nft_expr_ops *ops;
2135 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2138 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2139 const struct nlattr *nla,
2140 struct nft_expr_info *info)
2142 const struct nft_expr_type *type;
2143 const struct nft_expr_ops *ops;
2144 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2147 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2148 nft_expr_policy, NULL);
2152 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2154 return PTR_ERR(type);
2156 if (tb[NFTA_EXPR_DATA]) {
2157 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2159 type->policy, NULL);
2163 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2165 if (type->select_ops != NULL) {
2166 ops = type->select_ops(ctx,
2167 (const struct nlattr * const *)info->tb);
2170 #ifdef CONFIG_MODULES
2172 nft_expr_type_request_module(ctx->net,
2174 tb[NFTA_EXPR_NAME]);
2185 module_put(type->owner);
2189 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2190 const struct nft_expr_info *info,
2191 struct nft_expr *expr)
2193 const struct nft_expr_ops *ops = info->ops;
2198 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2209 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2210 struct nft_expr *expr)
2212 const struct nft_expr_type *type = expr->ops->type;
2214 if (expr->ops->destroy)
2215 expr->ops->destroy(ctx, expr);
2216 module_put(type->owner);
2219 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2220 const struct nlattr *nla)
2222 struct nft_expr_info info;
2223 struct nft_expr *expr;
2224 struct module *owner;
2227 err = nf_tables_expr_parse(ctx, nla, &info);
2232 expr = kzalloc(info.ops->size, GFP_KERNEL);
2236 err = nf_tables_newexpr(ctx, &info, expr);
2244 owner = info.ops->type->owner;
2245 if (info.ops->type->release_ops)
2246 info.ops->type->release_ops(info.ops);
2250 return ERR_PTR(err);
2253 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2255 nf_tables_expr_destroy(ctx, expr);
2263 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2266 struct nft_rule *rule;
2268 // FIXME: this sucks
2269 list_for_each_entry_rcu(rule, &chain->rules, list) {
2270 if (handle == rule->handle)
2274 return ERR_PTR(-ENOENT);
2277 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2278 const struct nlattr *nla)
2281 return ERR_PTR(-EINVAL);
2283 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2286 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2287 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2288 .len = NFT_TABLE_MAXNAMELEN - 1 },
2289 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2290 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2291 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2292 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2293 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2294 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2295 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2296 .len = NFT_USERDATA_MAXLEN },
2297 [NFTA_RULE_ID] = { .type = NLA_U32 },
2298 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2301 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2302 u32 portid, u32 seq, int event,
2303 u32 flags, int family,
2304 const struct nft_table *table,
2305 const struct nft_chain *chain,
2306 const struct nft_rule *rule,
2307 const struct nft_rule *prule)
2309 struct nlmsghdr *nlh;
2310 struct nfgenmsg *nfmsg;
2311 const struct nft_expr *expr, *next;
2312 struct nlattr *list;
2313 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2315 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2317 goto nla_put_failure;
2319 nfmsg = nlmsg_data(nlh);
2320 nfmsg->nfgen_family = family;
2321 nfmsg->version = NFNETLINK_V0;
2322 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
2324 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2325 goto nla_put_failure;
2326 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2327 goto nla_put_failure;
2328 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2330 goto nla_put_failure;
2332 if (event != NFT_MSG_DELRULE && prule) {
2333 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2334 cpu_to_be64(prule->handle),
2336 goto nla_put_failure;
2339 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2341 goto nla_put_failure;
2342 nft_rule_for_each_expr(expr, next, rule) {
2343 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2344 goto nla_put_failure;
2346 nla_nest_end(skb, list);
2349 struct nft_userdata *udata = nft_userdata(rule);
2350 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2352 goto nla_put_failure;
2355 nlmsg_end(skb, nlh);
2359 nlmsg_trim(skb, nlh);
2363 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2364 const struct nft_rule *rule, int event)
2366 struct sk_buff *skb;
2370 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2373 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2377 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2378 event, 0, ctx->family, ctx->table,
2379 ctx->chain, rule, NULL);
2385 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2386 ctx->report, GFP_KERNEL);
2389 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2392 struct nft_rule_dump_ctx {
2397 static int __nf_tables_dump_rules(struct sk_buff *skb,
2399 struct netlink_callback *cb,
2400 const struct nft_table *table,
2401 const struct nft_chain *chain)
2403 struct net *net = sock_net(skb->sk);
2404 const struct nft_rule *rule, *prule;
2405 unsigned int s_idx = cb->args[0];
2408 list_for_each_entry_rcu(rule, &chain->rules, list) {
2409 if (!nft_is_active(net, rule))
2414 memset(&cb->args[1], 0,
2415 sizeof(cb->args) - sizeof(cb->args[0]));
2417 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2420 NLM_F_MULTI | NLM_F_APPEND,
2422 table, chain, rule, prule) < 0)
2425 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2434 static int nf_tables_dump_rules(struct sk_buff *skb,
2435 struct netlink_callback *cb)
2437 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2438 const struct nft_rule_dump_ctx *ctx = cb->data;
2439 struct nft_table *table;
2440 const struct nft_chain *chain;
2441 unsigned int idx = 0;
2442 struct net *net = sock_net(skb->sk);
2443 int family = nfmsg->nfgen_family;
2446 cb->seq = net->nft.base_seq;
2448 list_for_each_entry_rcu(table, &net->nft.tables, list) {
2449 if (family != NFPROTO_UNSPEC && family != table->family)
2452 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2455 if (ctx && ctx->table && ctx->chain) {
2456 struct rhlist_head *list, *tmp;
2458 list = rhltable_lookup(&table->chains_ht, ctx->chain,
2459 nft_chain_ht_params);
2463 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2464 if (!nft_is_active(net, chain))
2466 __nf_tables_dump_rules(skb, &idx,
2473 list_for_each_entry_rcu(chain, &table->chains, list) {
2474 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2478 if (ctx && ctx->table)
2488 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2490 const struct nlattr * const *nla = cb->data;
2491 struct nft_rule_dump_ctx *ctx = NULL;
2493 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2494 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2498 if (nla[NFTA_RULE_TABLE]) {
2499 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2506 if (nla[NFTA_RULE_CHAIN]) {
2507 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2521 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2523 struct nft_rule_dump_ctx *ctx = cb->data;
2533 /* called with rcu_read_lock held */
2534 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2535 struct sk_buff *skb, const struct nlmsghdr *nlh,
2536 const struct nlattr * const nla[],
2537 struct netlink_ext_ack *extack)
2539 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2540 u8 genmask = nft_genmask_cur(net);
2541 const struct nft_chain *chain;
2542 const struct nft_rule *rule;
2543 struct nft_table *table;
2544 struct sk_buff *skb2;
2545 int family = nfmsg->nfgen_family;
2548 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2549 struct netlink_dump_control c = {
2550 .start= nf_tables_dump_rules_start,
2551 .dump = nf_tables_dump_rules,
2552 .done = nf_tables_dump_rules_done,
2553 .module = THIS_MODULE,
2554 .data = (void *)nla,
2557 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
2560 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2561 if (IS_ERR(table)) {
2562 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2563 return PTR_ERR(table);
2566 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2567 if (IS_ERR(chain)) {
2568 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2569 return PTR_ERR(chain);
2572 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2574 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2575 return PTR_ERR(rule);
2578 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
2582 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2583 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2584 family, table, chain, rule, NULL);
2588 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2595 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2596 struct nft_rule *rule)
2598 struct nft_expr *expr, *next;
2601 * Careful: some expressions might not be initialized in case this
2602 * is called on error from nf_tables_newrule().
2604 expr = nft_expr_first(rule);
2605 while (expr != nft_expr_last(rule) && expr->ops) {
2606 next = nft_expr_next(expr);
2607 nf_tables_expr_destroy(ctx, expr);
2613 static void nf_tables_rule_release(const struct nft_ctx *ctx,
2614 struct nft_rule *rule)
2616 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
2617 nf_tables_rule_destroy(ctx, rule);
2620 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
2622 struct nft_expr *expr, *last;
2623 const struct nft_data *data;
2624 struct nft_rule *rule;
2627 if (ctx->level == NFT_JUMP_STACK_SIZE)
2630 list_for_each_entry(rule, &chain->rules, list) {
2631 if (!nft_is_active_next(ctx->net, rule))
2634 nft_rule_for_each_expr(expr, last, rule) {
2635 if (!expr->ops->validate)
2638 err = expr->ops->validate(ctx, expr, &data);
2646 EXPORT_SYMBOL_GPL(nft_chain_validate);
2648 static int nft_table_validate(struct net *net, const struct nft_table *table)
2650 struct nft_chain *chain;
2651 struct nft_ctx ctx = {
2653 .family = table->family,
2657 list_for_each_entry(chain, &table->chains, list) {
2658 if (!nft_is_base_chain(chain))
2662 err = nft_chain_validate(&ctx, chain);
2670 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2671 const struct nlattr *nla);
2673 #define NFT_RULE_MAXEXPRS 128
2675 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2676 struct sk_buff *skb, const struct nlmsghdr *nlh,
2677 const struct nlattr * const nla[],
2678 struct netlink_ext_ack *extack)
2680 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2681 u8 genmask = nft_genmask_next(net);
2682 struct nft_expr_info *info = NULL;
2683 int family = nfmsg->nfgen_family;
2684 struct nft_flow_rule *flow;
2685 struct nft_table *table;
2686 struct nft_chain *chain;
2687 struct nft_rule *rule, *old_rule = NULL;
2688 struct nft_userdata *udata;
2689 struct nft_trans *trans = NULL;
2690 struct nft_expr *expr;
2693 unsigned int size, i, n, ulen = 0, usize = 0;
2695 u64 handle, pos_handle;
2697 lockdep_assert_held(&net->nft.commit_mutex);
2699 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2700 if (IS_ERR(table)) {
2701 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2702 return PTR_ERR(table);
2705 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2706 if (IS_ERR(chain)) {
2707 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2708 return PTR_ERR(chain);
2711 if (nla[NFTA_RULE_HANDLE]) {
2712 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2713 rule = __nft_rule_lookup(chain, handle);
2715 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2716 return PTR_ERR(rule);
2719 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2720 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2723 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2728 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
2729 nlh->nlmsg_flags & NLM_F_REPLACE)
2731 handle = nf_tables_alloc_handle(table);
2733 if (chain->use == UINT_MAX)
2736 if (nla[NFTA_RULE_POSITION]) {
2737 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2738 old_rule = __nft_rule_lookup(chain, pos_handle);
2739 if (IS_ERR(old_rule)) {
2740 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
2741 return PTR_ERR(old_rule);
2743 } else if (nla[NFTA_RULE_POSITION_ID]) {
2744 old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
2745 if (IS_ERR(old_rule)) {
2746 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
2747 return PTR_ERR(old_rule);
2752 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2756 if (nla[NFTA_RULE_EXPRESSIONS]) {
2757 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
2758 sizeof(struct nft_expr_info),
2763 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2765 if (nla_type(tmp) != NFTA_LIST_ELEM)
2767 if (n == NFT_RULE_MAXEXPRS)
2769 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2772 size += info[n].ops->size;
2776 /* Check for overflow of dlen field */
2778 if (size >= 1 << 12)
2781 if (nla[NFTA_RULE_USERDATA]) {
2782 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2784 usize = sizeof(struct nft_userdata) + ulen;
2788 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2792 nft_activate_next(net, rule);
2794 rule->handle = handle;
2796 rule->udata = ulen ? 1 : 0;
2799 udata = nft_userdata(rule);
2800 udata->len = ulen - 1;
2801 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2804 expr = nft_expr_first(rule);
2805 for (i = 0; i < n; i++) {
2806 err = nf_tables_newexpr(&ctx, &info[i], expr);
2810 if (info[i].ops->validate)
2811 nft_validate_state_update(net, NFT_VALIDATE_NEED);
2814 expr = nft_expr_next(expr);
2817 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2818 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
2819 if (trans == NULL) {
2823 err = nft_delrule(&ctx, old_rule);
2825 nft_trans_destroy(trans);
2829 list_add_tail_rcu(&rule->list, &old_rule->list);
2831 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
2837 if (nlh->nlmsg_flags & NLM_F_APPEND) {
2839 list_add_rcu(&rule->list, &old_rule->list);
2841 list_add_tail_rcu(&rule->list, &chain->rules);
2844 list_add_tail_rcu(&rule->list, &old_rule->list);
2846 list_add_rcu(&rule->list, &chain->rules);
2852 if (net->nft.validate_state == NFT_VALIDATE_DO)
2853 return nft_table_validate(net, table);
2855 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
2856 flow = nft_flow_rule_create(net, rule);
2858 return PTR_ERR(flow);
2860 nft_trans_flow_rule(trans) = flow;
2865 nf_tables_rule_release(&ctx, rule);
2867 for (i = 0; i < n; i++) {
2869 module_put(info[i].ops->type->owner);
2870 if (info[i].ops->type->release_ops)
2871 info[i].ops->type->release_ops(info[i].ops);
2878 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2879 const struct nlattr *nla)
2881 u32 id = ntohl(nla_get_be32(nla));
2882 struct nft_trans *trans;
2884 list_for_each_entry(trans, &net->nft.commit_list, list) {
2885 struct nft_rule *rule = nft_trans_rule(trans);
2887 if (trans->msg_type == NFT_MSG_NEWRULE &&
2888 id == nft_trans_rule_id(trans))
2891 return ERR_PTR(-ENOENT);
2894 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2895 struct sk_buff *skb, const struct nlmsghdr *nlh,
2896 const struct nlattr * const nla[],
2897 struct netlink_ext_ack *extack)
2899 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2900 u8 genmask = nft_genmask_next(net);
2901 struct nft_table *table;
2902 struct nft_chain *chain = NULL;
2903 struct nft_rule *rule;
2904 int family = nfmsg->nfgen_family, err = 0;
2907 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2908 if (IS_ERR(table)) {
2909 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2910 return PTR_ERR(table);
2913 if (nla[NFTA_RULE_CHAIN]) {
2914 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
2916 if (IS_ERR(chain)) {
2917 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2918 return PTR_ERR(chain);
2922 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2925 if (nla[NFTA_RULE_HANDLE]) {
2926 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2928 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2929 return PTR_ERR(rule);
2932 err = nft_delrule(&ctx, rule);
2933 } else if (nla[NFTA_RULE_ID]) {
2934 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2936 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
2937 return PTR_ERR(rule);
2940 err = nft_delrule(&ctx, rule);
2942 err = nft_delrule_by_chain(&ctx);
2945 list_for_each_entry(chain, &table->chains, list) {
2946 if (!nft_is_active_next(net, chain))
2950 err = nft_delrule_by_chain(&ctx);
2963 static LIST_HEAD(nf_tables_set_types);
2965 int nft_register_set(struct nft_set_type *type)
2967 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2968 list_add_tail_rcu(&type->list, &nf_tables_set_types);
2969 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2972 EXPORT_SYMBOL_GPL(nft_register_set);
2974 void nft_unregister_set(struct nft_set_type *type)
2976 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2977 list_del_rcu(&type->list);
2978 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2980 EXPORT_SYMBOL_GPL(nft_unregister_set);
2982 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
2983 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
2986 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
2988 return (flags & type->features) == (flags & NFT_SET_FEATURES);
2992 * Select a set implementation based on the data characteristics and the
2993 * given policy. The total memory use might not be known if no size is
2994 * given, in that case the amount of memory per element is used.
2996 static const struct nft_set_ops *
2997 nft_select_set_ops(const struct nft_ctx *ctx,
2998 const struct nlattr * const nla[],
2999 const struct nft_set_desc *desc,
3000 enum nft_set_policies policy)
3002 const struct nft_set_ops *ops, *bops;
3003 struct nft_set_estimate est, best;
3004 const struct nft_set_type *type;
3007 lockdep_assert_held(&ctx->net->nft.commit_mutex);
3008 lockdep_nfnl_nft_mutex_not_held();
3009 #ifdef CONFIG_MODULES
3010 if (list_empty(&nf_tables_set_types)) {
3011 nft_request_module(ctx->net, "nft-set");
3012 if (!list_empty(&nf_tables_set_types))
3013 return ERR_PTR(-EAGAIN);
3016 if (nla[NFTA_SET_FLAGS] != NULL)
3017 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3024 list_for_each_entry(type, &nf_tables_set_types, list) {
3027 if (!nft_set_ops_candidate(type, flags))
3029 if (!ops->estimate(desc, flags, &est))
3033 case NFT_SET_POL_PERFORMANCE:
3034 if (est.lookup < best.lookup)
3036 if (est.lookup == best.lookup &&
3037 est.space < best.space)
3040 case NFT_SET_POL_MEMORY:
3042 if (est.space < best.space)
3044 if (est.space == best.space &&
3045 est.lookup < best.lookup)
3047 } else if (est.size < best.size || !bops) {
3055 if (!try_module_get(type->owner))
3058 module_put(to_set_type(bops)->owner);
3067 return ERR_PTR(-EOPNOTSUPP);
3070 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3071 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3072 .len = NFT_TABLE_MAXNAMELEN - 1 },
3073 [NFTA_SET_NAME] = { .type = NLA_STRING,
3074 .len = NFT_SET_MAXNAMELEN - 1 },
3075 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3076 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3077 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3078 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3079 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
3080 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3081 [NFTA_SET_DESC] = { .type = NLA_NESTED },
3082 [NFTA_SET_ID] = { .type = NLA_U32 },
3083 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3084 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
3085 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3086 .len = NFT_USERDATA_MAXLEN },
3087 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3088 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
3091 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3092 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
3095 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
3096 const struct sk_buff *skb,
3097 const struct nlmsghdr *nlh,
3098 const struct nlattr * const nla[],
3099 struct netlink_ext_ack *extack,
3102 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3103 int family = nfmsg->nfgen_family;
3104 struct nft_table *table = NULL;
3106 if (nla[NFTA_SET_TABLE] != NULL) {
3107 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3109 if (IS_ERR(table)) {
3110 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3111 return PTR_ERR(table);
3115 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3119 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3120 const struct nlattr *nla, u8 genmask)
3122 struct nft_set *set;
3125 return ERR_PTR(-EINVAL);
3127 list_for_each_entry_rcu(set, &table->sets, list) {
3128 if (!nla_strcmp(nla, set->name) &&
3129 nft_active_genmask(set, genmask))
3132 return ERR_PTR(-ENOENT);
3135 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3136 const struct nlattr *nla,
3139 struct nft_set *set;
3141 list_for_each_entry(set, &table->sets, list) {
3142 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3143 nft_active_genmask(set, genmask))
3146 return ERR_PTR(-ENOENT);
3149 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3150 const struct nlattr *nla, u8 genmask)
3152 struct nft_trans *trans;
3153 u32 id = ntohl(nla_get_be32(nla));
3155 list_for_each_entry(trans, &net->nft.commit_list, list) {
3156 if (trans->msg_type == NFT_MSG_NEWSET) {
3157 struct nft_set *set = nft_trans_set(trans);
3159 if (id == nft_trans_set_id(trans) &&
3160 nft_active_genmask(set, genmask))
3164 return ERR_PTR(-ENOENT);
3167 struct nft_set *nft_set_lookup_global(const struct net *net,
3168 const struct nft_table *table,
3169 const struct nlattr *nla_set_name,
3170 const struct nlattr *nla_set_id,
3173 struct nft_set *set;
3175 set = nft_set_lookup(table, nla_set_name, genmask);
3180 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3184 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3186 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3189 const struct nft_set *i;
3191 unsigned long *inuse;
3192 unsigned int n = 0, min = 0;
3194 p = strchr(name, '%');
3196 if (p[1] != 'd' || strchr(p + 2, '%'))
3199 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3203 list_for_each_entry(i, &ctx->table->sets, list) {
3206 if (!nft_is_active_next(ctx->net, set))
3208 if (!sscanf(i->name, name, &tmp))
3210 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3213 set_bit(tmp - min, inuse);
3216 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3217 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3218 min += BITS_PER_BYTE * PAGE_SIZE;
3219 memset(inuse, 0, PAGE_SIZE);
3222 free_page((unsigned long)inuse);
3225 set->name = kasprintf(GFP_KERNEL, name, min + n);
3229 list_for_each_entry(i, &ctx->table->sets, list) {
3230 if (!nft_is_active_next(ctx->net, i))
3232 if (!strcmp(set->name, i->name)) {
3240 static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3242 u64 ms = be64_to_cpu(nla_get_be64(nla));
3243 u64 max = (u64)(~((u64)0));
3245 max = div_u64(max, NSEC_PER_MSEC);
3249 ms *= NSEC_PER_MSEC;
3250 *result = nsecs_to_jiffies64(ms);
3254 static __be64 nf_jiffies64_to_msecs(u64 input)
3256 return cpu_to_be64(jiffies64_to_msecs(input));
3259 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3260 const struct nft_set *set, u16 event, u16 flags)
3262 struct nfgenmsg *nfmsg;
3263 struct nlmsghdr *nlh;
3264 struct nlattr *desc;
3265 u32 portid = ctx->portid;
3268 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3269 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3272 goto nla_put_failure;
3274 nfmsg = nlmsg_data(nlh);
3275 nfmsg->nfgen_family = ctx->family;
3276 nfmsg->version = NFNETLINK_V0;
3277 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3279 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3280 goto nla_put_failure;
3281 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3282 goto nla_put_failure;
3283 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3285 goto nla_put_failure;
3286 if (set->flags != 0)
3287 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3288 goto nla_put_failure;
3290 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3291 goto nla_put_failure;
3292 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3293 goto nla_put_failure;
3294 if (set->flags & NFT_SET_MAP) {
3295 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3296 goto nla_put_failure;
3297 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3298 goto nla_put_failure;
3300 if (set->flags & NFT_SET_OBJECT &&
3301 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3302 goto nla_put_failure;
3305 nla_put_be64(skb, NFTA_SET_TIMEOUT,
3306 nf_jiffies64_to_msecs(set->timeout),
3308 goto nla_put_failure;
3310 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3311 goto nla_put_failure;
3313 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3314 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3315 goto nla_put_failure;
3318 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3319 goto nla_put_failure;
3321 desc = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3323 goto nla_put_failure;
3325 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3326 goto nla_put_failure;
3327 nla_nest_end(skb, desc);
3329 nlmsg_end(skb, nlh);
3333 nlmsg_trim(skb, nlh);
3337 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3338 const struct nft_set *set, int event,
3341 struct sk_buff *skb;
3342 u32 portid = ctx->portid;
3346 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3349 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3353 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3359 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
3363 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3366 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3368 const struct nft_set *set;
3369 unsigned int idx, s_idx = cb->args[0];
3370 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3371 struct net *net = sock_net(skb->sk);
3372 struct nft_ctx *ctx = cb->data, ctx_set;
3378 cb->seq = net->nft.base_seq;
3380 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3381 if (ctx->family != NFPROTO_UNSPEC &&
3382 ctx->family != table->family)
3385 if (ctx->table && ctx->table != table)
3389 if (cur_table != table)
3395 list_for_each_entry_rcu(set, &table->sets, list) {
3398 if (!nft_is_active(net, set))
3402 ctx_set.table = table;
3403 ctx_set.family = table->family;
3405 if (nf_tables_fill_set(skb, &ctx_set, set,
3409 cb->args[2] = (unsigned long) table;
3412 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3425 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3427 struct nft_ctx *ctx_dump = NULL;
3429 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3430 if (ctx_dump == NULL)
3433 cb->data = ctx_dump;
3437 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3443 /* called with rcu_read_lock held */
3444 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3445 struct sk_buff *skb, const struct nlmsghdr *nlh,
3446 const struct nlattr * const nla[],
3447 struct netlink_ext_ack *extack)
3449 u8 genmask = nft_genmask_cur(net);
3450 const struct nft_set *set;
3452 struct sk_buff *skb2;
3453 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3456 /* Verify existence before starting dump */
3457 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3462 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3463 struct netlink_dump_control c = {
3464 .start = nf_tables_dump_sets_start,
3465 .dump = nf_tables_dump_sets,
3466 .done = nf_tables_dump_sets_done,
3468 .module = THIS_MODULE,
3471 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3474 /* Only accept unspec with dump */
3475 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3476 return -EAFNOSUPPORT;
3477 if (!nla[NFTA_SET_TABLE])
3480 set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3482 return PTR_ERR(set);
3484 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3488 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3492 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3499 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
3500 const struct nlattr *nla)
3502 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
3505 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
3506 nft_set_desc_policy, NULL);
3510 if (da[NFTA_SET_DESC_SIZE] != NULL)
3511 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
3516 static int nf_tables_newset(struct net *net, struct sock *nlsk,
3517 struct sk_buff *skb, const struct nlmsghdr *nlh,
3518 const struct nlattr * const nla[],
3519 struct netlink_ext_ack *extack)
3521 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3522 u8 genmask = nft_genmask_next(net);
3523 int family = nfmsg->nfgen_family;
3524 const struct nft_set_ops *ops;
3525 struct nft_table *table;
3526 struct nft_set *set;
3531 u32 ktype, dtype, flags, policy, gc_int, objtype;
3532 struct nft_set_desc desc;
3533 unsigned char *udata;
3537 if (nla[NFTA_SET_TABLE] == NULL ||
3538 nla[NFTA_SET_NAME] == NULL ||
3539 nla[NFTA_SET_KEY_LEN] == NULL ||
3540 nla[NFTA_SET_ID] == NULL)
3543 memset(&desc, 0, sizeof(desc));
3545 ktype = NFT_DATA_VALUE;
3546 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3547 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3548 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3552 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
3553 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
3557 if (nla[NFTA_SET_FLAGS] != NULL) {
3558 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3559 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
3560 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
3561 NFT_SET_MAP | NFT_SET_EVAL |
3564 /* Only one of these operations is supported */
3565 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
3566 (NFT_SET_MAP | NFT_SET_OBJECT))
3568 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3569 (NFT_SET_EVAL | NFT_SET_OBJECT))
3574 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3575 if (!(flags & NFT_SET_MAP))
3578 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3579 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3580 dtype != NFT_DATA_VERDICT)
3583 if (dtype != NFT_DATA_VERDICT) {
3584 if (nla[NFTA_SET_DATA_LEN] == NULL)
3586 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
3587 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
3590 desc.dlen = sizeof(struct nft_verdict);
3591 } else if (flags & NFT_SET_MAP)
3594 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3595 if (!(flags & NFT_SET_OBJECT))
3598 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3599 if (objtype == NFT_OBJECT_UNSPEC ||
3600 objtype > NFT_OBJECT_MAX)
3602 } else if (flags & NFT_SET_OBJECT)
3605 objtype = NFT_OBJECT_UNSPEC;
3608 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3609 if (!(flags & NFT_SET_TIMEOUT))
3612 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
3617 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3618 if (!(flags & NFT_SET_TIMEOUT))
3620 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3623 policy = NFT_SET_POL_PERFORMANCE;
3624 if (nla[NFTA_SET_POLICY] != NULL)
3625 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3627 if (nla[NFTA_SET_DESC] != NULL) {
3628 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
3633 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
3634 if (IS_ERR(table)) {
3635 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3636 return PTR_ERR(table);
3639 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
3641 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
3643 if (PTR_ERR(set) != -ENOENT) {
3644 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3645 return PTR_ERR(set);
3648 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3649 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3652 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3658 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3661 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
3663 return PTR_ERR(ops);
3666 if (nla[NFTA_SET_USERDATA])
3667 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3670 if (ops->privsize != NULL)
3671 size = ops->privsize(nla, &desc);
3673 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3679 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3685 err = nf_tables_set_alloc_name(&ctx, set, name);
3692 udata = set->data + size;
3693 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3696 INIT_LIST_HEAD(&set->bindings);
3698 write_pnet(&set->net, net);
3701 set->klen = desc.klen;
3703 set->objtype = objtype;
3704 set->dlen = desc.dlen;
3706 set->size = desc.size;
3707 set->policy = policy;
3710 set->timeout = timeout;
3711 set->gc_int = gc_int;
3712 set->handle = nf_tables_alloc_handle(table);
3714 err = ops->init(set, &desc, nla);
3718 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3722 list_add_tail_rcu(&set->list, &table->sets);
3733 module_put(to_set_type(ops)->owner);
3737 static void nft_set_destroy(struct nft_set *set)
3739 if (WARN_ON(set->use > 0))
3742 set->ops->destroy(set);
3743 module_put(to_set_type(set->ops)->owner);
3748 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3749 struct sk_buff *skb, const struct nlmsghdr *nlh,
3750 const struct nlattr * const nla[],
3751 struct netlink_ext_ack *extack)
3753 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3754 u8 genmask = nft_genmask_next(net);
3755 const struct nlattr *attr;
3756 struct nft_set *set;
3760 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3761 return -EAFNOSUPPORT;
3762 if (nla[NFTA_SET_TABLE] == NULL)
3765 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3770 if (nla[NFTA_SET_HANDLE]) {
3771 attr = nla[NFTA_SET_HANDLE];
3772 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
3774 attr = nla[NFTA_SET_NAME];
3775 set = nft_set_lookup(ctx.table, attr, genmask);
3779 NL_SET_BAD_ATTR(extack, attr);
3780 return PTR_ERR(set);
3783 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
3784 NL_SET_BAD_ATTR(extack, attr);
3788 return nft_delset(&ctx, set);
3791 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3792 struct nft_set *set,
3793 const struct nft_set_iter *iter,
3794 struct nft_set_elem *elem)
3796 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3797 enum nft_registers dreg;
3799 dreg = nft_type_to_reg(set->dtype);
3800 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3801 set->dtype == NFT_DATA_VERDICT ?
3802 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3806 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3807 struct nft_set_binding *binding)
3809 struct nft_set_binding *i;
3810 struct nft_set_iter iter;
3812 if (set->use == UINT_MAX)
3815 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
3818 if (binding->flags & NFT_SET_MAP) {
3819 /* If the set is already bound to the same chain all
3820 * jumps are already validated for that chain.
3822 list_for_each_entry(i, &set->bindings, list) {
3823 if (i->flags & NFT_SET_MAP &&
3824 i->chain == binding->chain)
3828 iter.genmask = nft_genmask_next(ctx->net);
3832 iter.fn = nf_tables_bind_check_setelem;
3834 set->ops->walk(ctx, set, &iter);
3839 binding->chain = ctx->chain;
3840 list_add_tail_rcu(&binding->list, &set->bindings);
3841 nft_set_trans_bind(ctx, set);
3846 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3848 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3849 struct nft_set_binding *binding, bool event)
3851 list_del_rcu(&binding->list);
3853 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
3854 list_del_rcu(&set->list);
3856 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
3861 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
3862 struct nft_set_binding *binding,
3863 enum nft_trans_phase phase)
3866 case NFT_TRANS_PREPARE:
3869 case NFT_TRANS_ABORT:
3870 case NFT_TRANS_RELEASE:
3874 nf_tables_unbind_set(ctx, set, binding,
3875 phase == NFT_TRANS_COMMIT);
3878 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
3880 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
3882 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
3883 nft_set_destroy(set);
3885 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
3887 const struct nft_set_ext_type nft_set_ext_types[] = {
3888 [NFT_SET_EXT_KEY] = {
3889 .align = __alignof__(u32),
3891 [NFT_SET_EXT_DATA] = {
3892 .align = __alignof__(u32),
3894 [NFT_SET_EXT_EXPR] = {
3895 .align = __alignof__(struct nft_expr),
3897 [NFT_SET_EXT_OBJREF] = {
3898 .len = sizeof(struct nft_object *),
3899 .align = __alignof__(struct nft_object *),
3901 [NFT_SET_EXT_FLAGS] = {
3903 .align = __alignof__(u8),
3905 [NFT_SET_EXT_TIMEOUT] = {
3907 .align = __alignof__(u64),
3909 [NFT_SET_EXT_EXPIRATION] = {
3911 .align = __alignof__(u64),
3913 [NFT_SET_EXT_USERDATA] = {
3914 .len = sizeof(struct nft_userdata),
3915 .align = __alignof__(struct nft_userdata),
3918 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3924 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3925 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3926 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3927 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3928 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3929 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
3930 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3931 .len = NFT_USERDATA_MAXLEN },
3932 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
3933 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING },
3936 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3937 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3938 .len = NFT_TABLE_MAXNAMELEN - 1 },
3939 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3940 .len = NFT_SET_MAXNAMELEN - 1 },
3941 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3942 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3945 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3946 const struct sk_buff *skb,
3947 const struct nlmsghdr *nlh,
3948 const struct nlattr * const nla[],
3949 struct netlink_ext_ack *extack,
3952 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3953 int family = nfmsg->nfgen_family;
3954 struct nft_table *table;
3956 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
3958 if (IS_ERR(table)) {
3959 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
3960 return PTR_ERR(table);
3963 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3967 static int nf_tables_fill_setelem(struct sk_buff *skb,
3968 const struct nft_set *set,
3969 const struct nft_set_elem *elem)
3971 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3972 unsigned char *b = skb_tail_pointer(skb);
3973 struct nlattr *nest;
3975 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3977 goto nla_put_failure;
3979 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3980 NFT_DATA_VALUE, set->klen) < 0)
3981 goto nla_put_failure;
3983 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3984 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3985 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3987 goto nla_put_failure;
3989 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3990 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3991 goto nla_put_failure;
3993 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3994 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3995 (*nft_set_ext_obj(ext))->key.name) < 0)
3996 goto nla_put_failure;
3998 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3999 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4000 htonl(*nft_set_ext_flags(ext))))
4001 goto nla_put_failure;
4003 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4004 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4005 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4007 goto nla_put_failure;
4009 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4010 u64 expires, now = get_jiffies_64();
4012 expires = *nft_set_ext_expiration(ext);
4013 if (time_before64(now, expires))
4018 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4019 nf_jiffies64_to_msecs(expires),
4021 goto nla_put_failure;
4024 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4025 struct nft_userdata *udata;
4027 udata = nft_set_ext_userdata(ext);
4028 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4029 udata->len + 1, udata->data))
4030 goto nla_put_failure;
4033 nla_nest_end(skb, nest);
4041 struct nft_set_dump_args {
4042 const struct netlink_callback *cb;
4043 struct nft_set_iter iter;
4044 struct sk_buff *skb;
4047 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4048 struct nft_set *set,
4049 const struct nft_set_iter *iter,
4050 struct nft_set_elem *elem)
4052 struct nft_set_dump_args *args;
4054 args = container_of(iter, struct nft_set_dump_args, iter);
4055 return nf_tables_fill_setelem(args->skb, set, elem);
4058 struct nft_set_dump_ctx {
4059 const struct nft_set *set;
4063 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4065 struct nft_set_dump_ctx *dump_ctx = cb->data;
4066 struct net *net = sock_net(skb->sk);
4067 struct nft_table *table;
4068 struct nft_set *set;
4069 struct nft_set_dump_args args;
4070 bool set_found = false;
4071 struct nfgenmsg *nfmsg;
4072 struct nlmsghdr *nlh;
4073 struct nlattr *nest;
4078 list_for_each_entry_rcu(table, &net->nft.tables, list) {
4079 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4080 dump_ctx->ctx.family != table->family)
4083 if (table != dump_ctx->ctx.table)
4086 list_for_each_entry_rcu(set, &table->sets, list) {
4087 if (set == dump_ctx->set) {
4100 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4101 portid = NETLINK_CB(cb->skb).portid;
4102 seq = cb->nlh->nlmsg_seq;
4104 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4107 goto nla_put_failure;
4109 nfmsg = nlmsg_data(nlh);
4110 nfmsg->nfgen_family = table->family;
4111 nfmsg->version = NFNETLINK_V0;
4112 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4114 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4115 goto nla_put_failure;
4116 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4117 goto nla_put_failure;
4119 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4121 goto nla_put_failure;
4125 args.iter.genmask = nft_genmask_cur(net);
4126 args.iter.skip = cb->args[0];
4127 args.iter.count = 0;
4129 args.iter.fn = nf_tables_dump_setelem;
4130 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4133 nla_nest_end(skb, nest);
4134 nlmsg_end(skb, nlh);
4136 if (args.iter.err && args.iter.err != -EMSGSIZE)
4137 return args.iter.err;
4138 if (args.iter.count == cb->args[0])
4141 cb->args[0] = args.iter.count;
4149 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4151 struct nft_set_dump_ctx *dump_ctx = cb->data;
4153 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4155 return cb->data ? 0 : -ENOMEM;
4158 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4164 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4165 const struct nft_ctx *ctx, u32 seq,
4166 u32 portid, int event, u16 flags,
4167 const struct nft_set *set,
4168 const struct nft_set_elem *elem)
4170 struct nfgenmsg *nfmsg;
4171 struct nlmsghdr *nlh;
4172 struct nlattr *nest;
4175 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4176 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4179 goto nla_put_failure;
4181 nfmsg = nlmsg_data(nlh);
4182 nfmsg->nfgen_family = ctx->family;
4183 nfmsg->version = NFNETLINK_V0;
4184 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
4186 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4187 goto nla_put_failure;
4188 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4189 goto nla_put_failure;
4191 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4193 goto nla_put_failure;
4195 err = nf_tables_fill_setelem(skb, set, elem);
4197 goto nla_put_failure;
4199 nla_nest_end(skb, nest);
4201 nlmsg_end(skb, nlh);
4205 nlmsg_trim(skb, nlh);
4209 static int nft_setelem_parse_flags(const struct nft_set *set,
4210 const struct nlattr *attr, u32 *flags)
4215 *flags = ntohl(nla_get_be32(attr));
4216 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4218 if (!(set->flags & NFT_SET_INTERVAL) &&
4219 *flags & NFT_SET_ELEM_INTERVAL_END)
4225 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4226 const struct nlattr *attr)
4228 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4229 struct nft_data_desc desc;
4230 struct nft_set_elem elem;
4231 struct sk_buff *skb;
4236 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4237 nft_set_elem_policy, NULL);
4241 if (!nla[NFTA_SET_ELEM_KEY])
4244 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4248 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4249 nla[NFTA_SET_ELEM_KEY]);
4254 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4257 priv = set->ops->get(ctx->net, set, &elem, flags);
4259 return PTR_ERR(priv);
4264 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
4268 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4269 NFT_MSG_NEWSETELEM, 0, set, &elem);
4273 err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT);
4274 /* This avoids a loop in nfnetlink. */
4282 /* this avoids a loop in nfnetlink. */
4283 return err == -EAGAIN ? -ENOBUFS : err;
4286 /* called with rcu_read_lock held */
4287 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4288 struct sk_buff *skb, const struct nlmsghdr *nlh,
4289 const struct nlattr * const nla[],
4290 struct netlink_ext_ack *extack)
4292 u8 genmask = nft_genmask_cur(net);
4293 struct nft_set *set;
4294 struct nlattr *attr;
4298 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4303 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4305 return PTR_ERR(set);
4307 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4308 struct netlink_dump_control c = {
4309 .start = nf_tables_dump_set_start,
4310 .dump = nf_tables_dump_set,
4311 .done = nf_tables_dump_set_done,
4312 .module = THIS_MODULE,
4314 struct nft_set_dump_ctx dump_ctx = {
4320 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4323 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4326 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4327 err = nft_get_set_elem(&ctx, set, attr);
4335 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4336 const struct nft_set *set,
4337 const struct nft_set_elem *elem,
4338 int event, u16 flags)
4340 struct net *net = ctx->net;
4341 u32 portid = ctx->portid;
4342 struct sk_buff *skb;
4345 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4348 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4352 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
4359 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
4363 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4366 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
4368 struct nft_set *set)
4370 struct nft_trans *trans;
4372 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
4376 nft_trans_elem_set(trans) = set;
4380 void *nft_set_elem_init(const struct nft_set *set,
4381 const struct nft_set_ext_tmpl *tmpl,
4382 const u32 *key, const u32 *data,
4383 u64 timeout, u64 expiration, gfp_t gfp)
4385 struct nft_set_ext *ext;
4388 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
4392 ext = nft_set_elem_ext(set, elem);
4393 nft_set_ext_init(ext, tmpl);
4395 memcpy(nft_set_ext_key(ext), key, set->klen);
4396 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4397 memcpy(nft_set_ext_data(ext), data, set->dlen);
4398 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4399 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
4400 if (expiration == 0)
4401 *nft_set_ext_expiration(ext) += timeout;
4403 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
4404 *nft_set_ext_timeout(ext) = timeout;
4409 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
4412 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4413 struct nft_ctx ctx = {
4414 .net = read_pnet(&set->net),
4415 .family = set->table->family,
4418 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
4419 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4420 nft_data_release(nft_set_ext_data(ext), set->dtype);
4421 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) {
4422 struct nft_expr *expr = nft_set_ext_expr(ext);
4424 if (expr->ops->destroy_clone) {
4425 expr->ops->destroy_clone(&ctx, expr);
4426 module_put(expr->ops->type->owner);
4428 nf_tables_expr_destroy(&ctx, expr);
4431 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4432 (*nft_set_ext_obj(ext))->use--;
4435 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
4437 /* Only called from commit path, nft_set_elem_deactivate() already deals with
4438 * the refcounting from the preparation phase.
4440 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
4441 const struct nft_set *set, void *elem)
4443 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4445 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
4446 nf_tables_expr_destroy(ctx, nft_set_ext_expr(ext));
4450 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4451 const struct nlattr *attr, u32 nlmsg_flags)
4453 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4454 u8 genmask = nft_genmask_next(ctx->net);
4455 struct nft_data_desc d1, d2;
4456 struct nft_set_ext_tmpl tmpl;
4457 struct nft_set_ext *ext, *ext2;
4458 struct nft_set_elem elem;
4459 struct nft_set_binding *binding;
4460 struct nft_object *obj = NULL;
4461 struct nft_userdata *udata;
4462 struct nft_data data;
4463 enum nft_registers dreg;
4464 struct nft_trans *trans;
4471 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4472 nft_set_elem_policy, NULL);
4476 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4479 nft_set_ext_prepare(&tmpl);
4481 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4485 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4487 if (set->flags & NFT_SET_MAP) {
4488 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
4489 !(flags & NFT_SET_ELEM_INTERVAL_END))
4491 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
4492 flags & NFT_SET_ELEM_INTERVAL_END)
4495 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4500 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
4501 if (!(set->flags & NFT_SET_TIMEOUT))
4503 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
4507 } else if (set->flags & NFT_SET_TIMEOUT) {
4508 timeout = set->timeout;
4512 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
4513 if (!(set->flags & NFT_SET_TIMEOUT))
4515 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
4521 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
4522 nla[NFTA_SET_ELEM_KEY]);
4526 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
4529 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
4531 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
4532 if (timeout != set->timeout)
4533 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
4536 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
4537 if (!(set->flags & NFT_SET_OBJECT)) {
4541 obj = nft_obj_lookup(ctx->net, ctx->table,
4542 nla[NFTA_SET_ELEM_OBJREF],
4543 set->objtype, genmask);
4548 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
4551 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
4552 err = nft_data_init(ctx, &data, sizeof(data), &d2,
4553 nla[NFTA_SET_ELEM_DATA]);
4558 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
4561 dreg = nft_type_to_reg(set->dtype);
4562 list_for_each_entry(binding, &set->bindings, list) {
4563 struct nft_ctx bind_ctx = {
4565 .family = ctx->family,
4566 .table = ctx->table,
4567 .chain = (struct nft_chain *)binding->chain,
4570 if (!(binding->flags & NFT_SET_MAP))
4573 err = nft_validate_register_store(&bind_ctx, dreg,
4579 if (d2.type == NFT_DATA_VERDICT &&
4580 (data.verdict.code == NFT_GOTO ||
4581 data.verdict.code == NFT_JUMP))
4582 nft_validate_state_update(ctx->net,
4586 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
4589 /* The full maximum length of userdata can exceed the maximum
4590 * offset value (U8_MAX) for following extensions, therefor it
4591 * must be the last extension added.
4594 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
4595 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
4597 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
4602 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
4603 timeout, expiration, GFP_KERNEL);
4604 if (elem.priv == NULL)
4607 ext = nft_set_elem_ext(set, elem.priv);
4609 *nft_set_ext_flags(ext) = flags;
4611 udata = nft_set_ext_userdata(ext);
4612 udata->len = ulen - 1;
4613 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
4616 *nft_set_ext_obj(ext) = obj;
4620 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
4624 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
4625 err = set->ops->insert(ctx->net, set, &elem, &ext2);
4627 if (err == -EEXIST) {
4628 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
4629 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
4630 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
4631 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
4635 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4636 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
4637 memcmp(nft_set_ext_data(ext),
4638 nft_set_ext_data(ext2), set->dlen) != 0) ||
4639 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4640 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
4641 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
4643 else if (!(nlmsg_flags & NLM_F_EXCL))
4650 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
4655 nft_trans_elem(trans) = elem;
4656 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4660 set->ops->remove(ctx->net, set, &elem);
4668 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4669 nft_data_release(&data, d2.type);
4671 nft_data_release(&elem.key.val, d1.type);
4676 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
4677 struct sk_buff *skb, const struct nlmsghdr *nlh,
4678 const struct nlattr * const nla[],
4679 struct netlink_ext_ack *extack)
4681 u8 genmask = nft_genmask_next(net);
4682 const struct nlattr *attr;
4683 struct nft_set *set;
4687 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
4690 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4695 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4696 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
4698 return PTR_ERR(set);
4700 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4703 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4704 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
4709 if (net->nft.validate_state == NFT_VALIDATE_DO)
4710 return nft_table_validate(net, ctx.table);
4716 * nft_data_hold - hold a nft_data item
4718 * @data: struct nft_data to release
4719 * @type: type of data
4721 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4722 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
4723 * NFT_GOTO verdicts. This function must be called on active data objects
4724 * from the second phase of the commit protocol.
4726 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
4728 if (type == NFT_DATA_VERDICT) {
4729 switch (data->verdict.code) {
4732 data->verdict.chain->use++;
4738 static void nft_set_elem_activate(const struct net *net,
4739 const struct nft_set *set,
4740 struct nft_set_elem *elem)
4742 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4744 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4745 nft_data_hold(nft_set_ext_data(ext), set->dtype);
4746 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4747 (*nft_set_ext_obj(ext))->use++;
4750 static void nft_set_elem_deactivate(const struct net *net,
4751 const struct nft_set *set,
4752 struct nft_set_elem *elem)
4754 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4756 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4757 nft_data_release(nft_set_ext_data(ext), set->dtype);
4758 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4759 (*nft_set_ext_obj(ext))->use--;
4762 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
4763 const struct nlattr *attr)
4765 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4766 struct nft_set_ext_tmpl tmpl;
4767 struct nft_data_desc desc;
4768 struct nft_set_elem elem;
4769 struct nft_set_ext *ext;
4770 struct nft_trans *trans;
4775 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4776 nft_set_elem_policy, NULL);
4781 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4784 nft_set_ext_prepare(&tmpl);
4786 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4790 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4792 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4793 nla[NFTA_SET_ELEM_KEY]);
4798 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4801 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
4804 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
4806 if (elem.priv == NULL)
4809 ext = nft_set_elem_ext(set, elem.priv);
4811 *nft_set_ext_flags(ext) = flags;
4813 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
4814 if (trans == NULL) {
4819 priv = set->ops->deactivate(ctx->net, set, &elem);
4827 nft_set_elem_deactivate(ctx->net, set, &elem);
4829 nft_trans_elem(trans) = elem;
4830 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4838 nft_data_release(&elem.key.val, desc.type);
4843 static int nft_flush_set(const struct nft_ctx *ctx,
4844 struct nft_set *set,
4845 const struct nft_set_iter *iter,
4846 struct nft_set_elem *elem)
4848 struct nft_trans *trans;
4851 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
4852 sizeof(struct nft_trans_elem), GFP_ATOMIC);
4856 if (!set->ops->flush(ctx->net, set, elem->priv)) {
4862 nft_set_elem_deactivate(ctx->net, set, elem);
4863 nft_trans_elem_set(trans) = set;
4864 nft_trans_elem(trans) = *elem;
4865 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4873 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
4874 struct sk_buff *skb, const struct nlmsghdr *nlh,
4875 const struct nlattr * const nla[],
4876 struct netlink_ext_ack *extack)
4878 u8 genmask = nft_genmask_next(net);
4879 const struct nlattr *attr;
4880 struct nft_set *set;
4884 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4889 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4891 return PTR_ERR(set);
4892 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4895 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
4896 struct nft_set_iter iter = {
4898 .fn = nft_flush_set,
4900 set->ops->walk(&ctx, set, &iter);
4905 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4906 err = nft_del_setelem(&ctx, set, attr);
4915 void nft_set_gc_batch_release(struct rcu_head *rcu)
4917 struct nft_set_gc_batch *gcb;
4920 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4921 for (i = 0; i < gcb->head.cnt; i++)
4922 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
4925 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4927 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4930 struct nft_set_gc_batch *gcb;
4932 gcb = kzalloc(sizeof(*gcb), gfp);
4935 gcb->head.set = set;
4938 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4945 * nft_register_obj- register nf_tables stateful object type
4948 * Registers the object type for use with nf_tables. Returns zero on
4949 * success or a negative errno code otherwise.
4951 int nft_register_obj(struct nft_object_type *obj_type)
4953 if (obj_type->type == NFT_OBJECT_UNSPEC)
4956 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4957 list_add_rcu(&obj_type->list, &nf_tables_objects);
4958 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4961 EXPORT_SYMBOL_GPL(nft_register_obj);
4964 * nft_unregister_obj - unregister nf_tables object type
4967 * Unregisters the object type for use with nf_tables.
4969 void nft_unregister_obj(struct nft_object_type *obj_type)
4971 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4972 list_del_rcu(&obj_type->list);
4973 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4975 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4977 struct nft_object *nft_obj_lookup(const struct net *net,
4978 const struct nft_table *table,
4979 const struct nlattr *nla, u32 objtype,
4982 struct nft_object_hash_key k = { .table = table };
4983 char search[NFT_OBJ_MAXNAMELEN];
4984 struct rhlist_head *tmp, *list;
4985 struct nft_object *obj;
4987 nla_strlcpy(search, nla, sizeof(search));
4990 WARN_ON_ONCE(!rcu_read_lock_held() &&
4991 !lockdep_commit_lock_is_held(net));
4994 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
4998 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
4999 if (objtype == obj->ops->type->type &&
5000 nft_active_genmask(obj, genmask)) {
5007 return ERR_PTR(-ENOENT);
5009 EXPORT_SYMBOL_GPL(nft_obj_lookup);
5011 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
5012 const struct nlattr *nla,
5013 u32 objtype, u8 genmask)
5015 struct nft_object *obj;
5017 list_for_each_entry(obj, &table->objects, list) {
5018 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
5019 objtype == obj->ops->type->type &&
5020 nft_active_genmask(obj, genmask))
5023 return ERR_PTR(-ENOENT);
5026 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
5027 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
5028 .len = NFT_TABLE_MAXNAMELEN - 1 },
5029 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
5030 .len = NFT_OBJ_MAXNAMELEN - 1 },
5031 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
5032 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
5033 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
5036 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
5037 const struct nft_object_type *type,
5038 const struct nlattr *attr)
5041 const struct nft_object_ops *ops;
5042 struct nft_object *obj;
5045 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
5050 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
5051 type->policy, NULL);
5055 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
5058 if (type->select_ops) {
5059 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
5069 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
5073 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
5086 return ERR_PTR(err);
5089 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
5090 struct nft_object *obj, bool reset)
5092 struct nlattr *nest;
5094 nest = nla_nest_start_noflag(skb, attr);
5096 goto nla_put_failure;
5097 if (obj->ops->dump(skb, obj, reset) < 0)
5098 goto nla_put_failure;
5099 nla_nest_end(skb, nest);
5106 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
5108 const struct nft_object_type *type;
5110 list_for_each_entry(type, &nf_tables_objects, list) {
5111 if (objtype == type->type)
5117 static const struct nft_object_type *
5118 nft_obj_type_get(struct net *net, u32 objtype)
5120 const struct nft_object_type *type;
5122 type = __nft_obj_type_get(objtype);
5123 if (type != NULL && try_module_get(type->owner))
5126 lockdep_nfnl_nft_mutex_not_held();
5127 #ifdef CONFIG_MODULES
5129 nft_request_module(net, "nft-obj-%u", objtype);
5130 if (__nft_obj_type_get(objtype))
5131 return ERR_PTR(-EAGAIN);
5134 return ERR_PTR(-ENOENT);
5137 static int nf_tables_updobj(const struct nft_ctx *ctx,
5138 const struct nft_object_type *type,
5139 const struct nlattr *attr,
5140 struct nft_object *obj)
5142 struct nft_object *newobj;
5143 struct nft_trans *trans;
5146 if (!obj->ops->update)
5149 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
5150 sizeof(struct nft_trans_obj));
5154 newobj = nft_obj_init(ctx, type, attr);
5155 if (IS_ERR(newobj)) {
5156 err = PTR_ERR(newobj);
5157 goto err_free_trans;
5160 nft_trans_obj(trans) = obj;
5161 nft_trans_obj_update(trans) = true;
5162 nft_trans_obj_newobj(trans) = newobj;
5163 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5172 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
5173 struct sk_buff *skb, const struct nlmsghdr *nlh,
5174 const struct nlattr * const nla[],
5175 struct netlink_ext_ack *extack)
5177 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5178 const struct nft_object_type *type;
5179 u8 genmask = nft_genmask_next(net);
5180 int family = nfmsg->nfgen_family;
5181 struct nft_table *table;
5182 struct nft_object *obj;
5187 if (!nla[NFTA_OBJ_TYPE] ||
5188 !nla[NFTA_OBJ_NAME] ||
5189 !nla[NFTA_OBJ_DATA])
5192 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5193 if (IS_ERR(table)) {
5194 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5195 return PTR_ERR(table);
5198 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5199 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
5202 if (err != -ENOENT) {
5203 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5207 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5208 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5211 if (nlh->nlmsg_flags & NLM_F_REPLACE)
5214 type = nft_obj_type_get(net, objtype);
5215 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5217 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
5220 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5222 type = nft_obj_type_get(net, objtype);
5224 return PTR_ERR(type);
5226 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
5231 obj->key.table = table;
5232 obj->handle = nf_tables_alloc_handle(table);
5234 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
5235 if (!obj->key.name) {
5240 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
5244 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
5245 nft_objname_ht_params);
5249 list_add_tail_rcu(&obj->list, &table->objects);
5253 /* queued in transaction log */
5254 INIT_LIST_HEAD(&obj->list);
5257 kfree(obj->key.name);
5259 if (obj->ops->destroy)
5260 obj->ops->destroy(&ctx, obj);
5263 module_put(type->owner);
5267 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
5268 u32 portid, u32 seq, int event, u32 flags,
5269 int family, const struct nft_table *table,
5270 struct nft_object *obj, bool reset)
5272 struct nfgenmsg *nfmsg;
5273 struct nlmsghdr *nlh;
5275 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5276 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5278 goto nla_put_failure;
5280 nfmsg = nlmsg_data(nlh);
5281 nfmsg->nfgen_family = family;
5282 nfmsg->version = NFNETLINK_V0;
5283 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5285 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
5286 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
5287 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
5288 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
5289 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
5290 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
5292 goto nla_put_failure;
5294 nlmsg_end(skb, nlh);
5298 nlmsg_trim(skb, nlh);
5302 struct nft_obj_filter {
5307 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
5309 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5310 const struct nft_table *table;
5311 unsigned int idx = 0, s_idx = cb->args[0];
5312 struct nft_obj_filter *filter = cb->data;
5313 struct net *net = sock_net(skb->sk);
5314 int family = nfmsg->nfgen_family;
5315 struct nft_object *obj;
5318 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5322 cb->seq = net->nft.base_seq;
5324 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5325 if (family != NFPROTO_UNSPEC && family != table->family)
5328 list_for_each_entry_rcu(obj, &table->objects, list) {
5329 if (!nft_is_active(net, obj))
5334 memset(&cb->args[1], 0,
5335 sizeof(cb->args) - sizeof(cb->args[0]));
5336 if (filter && filter->table &&
5337 strcmp(filter->table, table->name))
5340 filter->type != NFT_OBJECT_UNSPEC &&
5341 obj->ops->type->type != filter->type)
5344 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
5347 NLM_F_MULTI | NLM_F_APPEND,
5348 table->family, table,
5352 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5364 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
5366 const struct nlattr * const *nla = cb->data;
5367 struct nft_obj_filter *filter = NULL;
5369 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
5370 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5374 if (nla[NFTA_OBJ_TABLE]) {
5375 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
5376 if (!filter->table) {
5382 if (nla[NFTA_OBJ_TYPE])
5383 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5390 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
5392 struct nft_obj_filter *filter = cb->data;
5395 kfree(filter->table);
5402 /* called with rcu_read_lock held */
5403 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
5404 struct sk_buff *skb, const struct nlmsghdr *nlh,
5405 const struct nlattr * const nla[],
5406 struct netlink_ext_ack *extack)
5408 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5409 u8 genmask = nft_genmask_cur(net);
5410 int family = nfmsg->nfgen_family;
5411 const struct nft_table *table;
5412 struct nft_object *obj;
5413 struct sk_buff *skb2;
5418 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5419 struct netlink_dump_control c = {
5420 .start = nf_tables_dump_obj_start,
5421 .dump = nf_tables_dump_obj,
5422 .done = nf_tables_dump_obj_done,
5423 .module = THIS_MODULE,
5424 .data = (void *)nla,
5427 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5430 if (!nla[NFTA_OBJ_NAME] ||
5431 !nla[NFTA_OBJ_TYPE])
5434 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5435 if (IS_ERR(table)) {
5436 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5437 return PTR_ERR(table);
5440 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5441 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
5443 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5444 return PTR_ERR(obj);
5447 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5451 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5454 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
5455 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
5456 family, table, obj, reset);
5460 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5466 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
5468 if (obj->ops->destroy)
5469 obj->ops->destroy(ctx, obj);
5471 module_put(obj->ops->type->owner);
5472 kfree(obj->key.name);
5476 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
5477 struct sk_buff *skb, const struct nlmsghdr *nlh,
5478 const struct nlattr * const nla[],
5479 struct netlink_ext_ack *extack)
5481 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5482 u8 genmask = nft_genmask_next(net);
5483 int family = nfmsg->nfgen_family;
5484 const struct nlattr *attr;
5485 struct nft_table *table;
5486 struct nft_object *obj;
5490 if (!nla[NFTA_OBJ_TYPE] ||
5491 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
5494 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5495 if (IS_ERR(table)) {
5496 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5497 return PTR_ERR(table);
5500 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5501 if (nla[NFTA_OBJ_HANDLE]) {
5502 attr = nla[NFTA_OBJ_HANDLE];
5503 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
5505 attr = nla[NFTA_OBJ_NAME];
5506 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
5510 NL_SET_BAD_ATTR(extack, attr);
5511 return PTR_ERR(obj);
5514 NL_SET_BAD_ATTR(extack, attr);
5518 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5520 return nft_delobj(&ctx, obj);
5523 void nft_obj_notify(struct net *net, const struct nft_table *table,
5524 struct nft_object *obj, u32 portid, u32 seq, int event,
5525 int family, int report, gfp_t gfp)
5527 struct sk_buff *skb;
5531 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5534 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
5538 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
5545 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
5548 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5550 EXPORT_SYMBOL_GPL(nft_obj_notify);
5552 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
5553 struct nft_object *obj, int event)
5555 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
5556 ctx->family, ctx->report, GFP_KERNEL);
5562 void nft_register_flowtable_type(struct nf_flowtable_type *type)
5564 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5565 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
5566 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5568 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
5570 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
5572 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5573 list_del_rcu(&type->list);
5574 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5576 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
5578 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
5579 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
5580 .len = NFT_NAME_MAXLEN - 1 },
5581 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
5582 .len = NFT_NAME_MAXLEN - 1 },
5583 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
5584 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
5587 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
5588 const struct nlattr *nla, u8 genmask)
5590 struct nft_flowtable *flowtable;
5592 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5593 if (!nla_strcmp(nla, flowtable->name) &&
5594 nft_active_genmask(flowtable, genmask))
5597 return ERR_PTR(-ENOENT);
5599 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
5601 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
5602 struct nft_flowtable *flowtable,
5603 enum nft_trans_phase phase)
5606 case NFT_TRANS_PREPARE:
5607 case NFT_TRANS_ABORT:
5608 case NFT_TRANS_RELEASE:
5615 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
5617 static struct nft_flowtable *
5618 nft_flowtable_lookup_byhandle(const struct nft_table *table,
5619 const struct nlattr *nla, u8 genmask)
5621 struct nft_flowtable *flowtable;
5623 list_for_each_entry(flowtable, &table->flowtables, list) {
5624 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
5625 nft_active_genmask(flowtable, genmask))
5628 return ERR_PTR(-ENOENT);
5631 static int nf_tables_parse_devices(const struct nft_ctx *ctx,
5632 const struct nlattr *attr,
5633 struct net_device *dev_array[], int *len)
5635 const struct nlattr *tmp;
5636 struct net_device *dev;
5637 char ifname[IFNAMSIZ];
5638 int rem, n = 0, err;
5640 nla_for_each_nested(tmp, attr, rem) {
5641 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
5646 nla_strlcpy(ifname, tmp, IFNAMSIZ);
5647 dev = __dev_get_by_name(ctx->net, ifname);
5653 dev_array[n++] = dev;
5654 if (n == NFT_FLOWTABLE_DEVICE_MAX) {
5668 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
5669 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
5670 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
5671 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
5674 static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx,
5675 const struct nlattr *attr,
5676 struct nft_flowtable *flowtable)
5678 struct net_device *dev_array[NFT_FLOWTABLE_DEVICE_MAX];
5679 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
5680 struct nf_hook_ops *ops;
5681 int hooknum, priority;
5684 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
5685 nft_flowtable_hook_policy, NULL);
5689 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
5690 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] ||
5691 !tb[NFTA_FLOWTABLE_HOOK_DEVS])
5694 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
5695 if (hooknum != NF_NETDEV_INGRESS)
5698 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
5700 err = nf_tables_parse_devices(ctx, tb[NFTA_FLOWTABLE_HOOK_DEVS],
5705 ops = kcalloc(n, sizeof(struct nf_hook_ops), GFP_KERNEL);
5709 flowtable->hooknum = hooknum;
5710 flowtable->priority = priority;
5711 flowtable->ops = ops;
5712 flowtable->ops_len = n;
5714 for (i = 0; i < n; i++) {
5715 flowtable->ops[i].pf = NFPROTO_NETDEV;
5716 flowtable->ops[i].hooknum = hooknum;
5717 flowtable->ops[i].priority = priority;
5718 flowtable->ops[i].priv = &flowtable->data;
5719 flowtable->ops[i].hook = flowtable->data.type->hook;
5720 flowtable->ops[i].dev = dev_array[i];
5726 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
5728 const struct nf_flowtable_type *type;
5730 list_for_each_entry(type, &nf_tables_flowtables, list) {
5731 if (family == type->family)
5737 static const struct nf_flowtable_type *
5738 nft_flowtable_type_get(struct net *net, u8 family)
5740 const struct nf_flowtable_type *type;
5742 type = __nft_flowtable_type_get(family);
5743 if (type != NULL && try_module_get(type->owner))
5746 lockdep_nfnl_nft_mutex_not_held();
5747 #ifdef CONFIG_MODULES
5749 nft_request_module(net, "nf-flowtable-%u", family);
5750 if (__nft_flowtable_type_get(family))
5751 return ERR_PTR(-EAGAIN);
5754 return ERR_PTR(-ENOENT);
5757 static void nft_unregister_flowtable_net_hooks(struct net *net,
5758 struct nft_flowtable *flowtable)
5762 for (i = 0; i < flowtable->ops_len; i++) {
5763 if (!flowtable->ops[i].dev)
5766 nf_unregister_net_hook(net, &flowtable->ops[i]);
5770 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
5771 struct sk_buff *skb,
5772 const struct nlmsghdr *nlh,
5773 const struct nlattr * const nla[],
5774 struct netlink_ext_ack *extack)
5776 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5777 const struct nf_flowtable_type *type;
5778 struct nft_flowtable *flowtable, *ft;
5779 u8 genmask = nft_genmask_next(net);
5780 int family = nfmsg->nfgen_family;
5781 struct nft_table *table;
5785 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5786 !nla[NFTA_FLOWTABLE_NAME] ||
5787 !nla[NFTA_FLOWTABLE_HOOK])
5790 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5792 if (IS_ERR(table)) {
5793 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5794 return PTR_ERR(table);
5797 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5799 if (IS_ERR(flowtable)) {
5800 err = PTR_ERR(flowtable);
5801 if (err != -ENOENT) {
5802 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5806 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5807 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5814 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5816 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
5820 flowtable->table = table;
5821 flowtable->handle = nf_tables_alloc_handle(table);
5823 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
5824 if (!flowtable->name) {
5829 type = nft_flowtable_type_get(net, family);
5831 err = PTR_ERR(type);
5835 flowtable->data.type = type;
5836 err = type->init(&flowtable->data);
5840 err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
5845 for (i = 0; i < flowtable->ops_len; i++) {
5846 if (!flowtable->ops[i].dev)
5849 list_for_each_entry(ft, &table->flowtables, list) {
5850 for (k = 0; k < ft->ops_len; k++) {
5851 if (!ft->ops[k].dev)
5854 if (flowtable->ops[i].dev == ft->ops[k].dev &&
5855 flowtable->ops[i].pf == ft->ops[k].pf) {
5862 err = nf_register_net_hook(net, &flowtable->ops[i]);
5867 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
5871 list_add_tail_rcu(&flowtable->list, &table->flowtables);
5876 i = flowtable->ops_len;
5878 for (k = i - 1; k >= 0; k--)
5879 nf_unregister_net_hook(net, &flowtable->ops[k]);
5881 kfree(flowtable->ops);
5883 flowtable->data.type->free(&flowtable->data);
5885 module_put(type->owner);
5887 kfree(flowtable->name);
5893 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
5894 struct sk_buff *skb,
5895 const struct nlmsghdr *nlh,
5896 const struct nlattr * const nla[],
5897 struct netlink_ext_ack *extack)
5899 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5900 u8 genmask = nft_genmask_next(net);
5901 int family = nfmsg->nfgen_family;
5902 struct nft_flowtable *flowtable;
5903 const struct nlattr *attr;
5904 struct nft_table *table;
5907 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5908 (!nla[NFTA_FLOWTABLE_NAME] &&
5909 !nla[NFTA_FLOWTABLE_HANDLE]))
5912 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5914 if (IS_ERR(table)) {
5915 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5916 return PTR_ERR(table);
5919 if (nla[NFTA_FLOWTABLE_HANDLE]) {
5920 attr = nla[NFTA_FLOWTABLE_HANDLE];
5921 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
5923 attr = nla[NFTA_FLOWTABLE_NAME];
5924 flowtable = nft_flowtable_lookup(table, attr, genmask);
5927 if (IS_ERR(flowtable)) {
5928 NL_SET_BAD_ATTR(extack, attr);
5929 return PTR_ERR(flowtable);
5931 if (flowtable->use > 0) {
5932 NL_SET_BAD_ATTR(extack, attr);
5936 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5938 return nft_delflowtable(&ctx, flowtable);
5941 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
5942 u32 portid, u32 seq, int event,
5943 u32 flags, int family,
5944 struct nft_flowtable *flowtable)
5946 struct nlattr *nest, *nest_devs;
5947 struct nfgenmsg *nfmsg;
5948 struct nlmsghdr *nlh;
5951 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5952 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5954 goto nla_put_failure;
5956 nfmsg = nlmsg_data(nlh);
5957 nfmsg->nfgen_family = family;
5958 nfmsg->version = NFNETLINK_V0;
5959 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5961 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
5962 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
5963 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
5964 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
5965 NFTA_FLOWTABLE_PAD))
5966 goto nla_put_failure;
5968 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
5970 goto nla_put_failure;
5971 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
5972 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->priority)))
5973 goto nla_put_failure;
5975 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
5977 goto nla_put_failure;
5979 for (i = 0; i < flowtable->ops_len; i++) {
5980 const struct net_device *dev = READ_ONCE(flowtable->ops[i].dev);
5983 nla_put_string(skb, NFTA_DEVICE_NAME, dev->name))
5984 goto nla_put_failure;
5986 nla_nest_end(skb, nest_devs);
5987 nla_nest_end(skb, nest);
5989 nlmsg_end(skb, nlh);
5993 nlmsg_trim(skb, nlh);
5997 struct nft_flowtable_filter {
6001 static int nf_tables_dump_flowtable(struct sk_buff *skb,
6002 struct netlink_callback *cb)
6004 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6005 struct nft_flowtable_filter *filter = cb->data;
6006 unsigned int idx = 0, s_idx = cb->args[0];
6007 struct net *net = sock_net(skb->sk);
6008 int family = nfmsg->nfgen_family;
6009 struct nft_flowtable *flowtable;
6010 const struct nft_table *table;
6013 cb->seq = net->nft.base_seq;
6015 list_for_each_entry_rcu(table, &net->nft.tables, list) {
6016 if (family != NFPROTO_UNSPEC && family != table->family)
6019 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6020 if (!nft_is_active(net, flowtable))
6025 memset(&cb->args[1], 0,
6026 sizeof(cb->args) - sizeof(cb->args[0]));
6027 if (filter && filter->table &&
6028 strcmp(filter->table, table->name))
6031 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
6033 NFT_MSG_NEWFLOWTABLE,
6034 NLM_F_MULTI | NLM_F_APPEND,
6035 table->family, flowtable) < 0)
6038 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6050 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
6052 const struct nlattr * const *nla = cb->data;
6053 struct nft_flowtable_filter *filter = NULL;
6055 if (nla[NFTA_FLOWTABLE_TABLE]) {
6056 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6060 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
6062 if (!filter->table) {
6072 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
6074 struct nft_flowtable_filter *filter = cb->data;
6079 kfree(filter->table);
6085 /* called with rcu_read_lock held */
6086 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
6087 struct sk_buff *skb,
6088 const struct nlmsghdr *nlh,
6089 const struct nlattr * const nla[],
6090 struct netlink_ext_ack *extack)
6092 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6093 u8 genmask = nft_genmask_cur(net);
6094 int family = nfmsg->nfgen_family;
6095 struct nft_flowtable *flowtable;
6096 const struct nft_table *table;
6097 struct sk_buff *skb2;
6100 if (nlh->nlmsg_flags & NLM_F_DUMP) {
6101 struct netlink_dump_control c = {
6102 .start = nf_tables_dump_flowtable_start,
6103 .dump = nf_tables_dump_flowtable,
6104 .done = nf_tables_dump_flowtable_done,
6105 .module = THIS_MODULE,
6106 .data = (void *)nla,
6109 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
6112 if (!nla[NFTA_FLOWTABLE_NAME])
6115 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6118 return PTR_ERR(table);
6120 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6122 if (IS_ERR(flowtable))
6123 return PTR_ERR(flowtable);
6125 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6129 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
6131 NFT_MSG_NEWFLOWTABLE, 0, family,
6136 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
6142 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
6143 struct nft_flowtable *flowtable,
6146 struct sk_buff *skb;
6150 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
6153 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6157 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
6159 ctx->family, flowtable);
6165 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
6166 ctx->report, GFP_KERNEL);
6169 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
6172 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
6174 kfree(flowtable->ops);
6175 kfree(flowtable->name);
6176 flowtable->data.type->free(&flowtable->data);
6177 module_put(flowtable->data.type->owner);
6181 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
6182 u32 portid, u32 seq)
6184 struct nlmsghdr *nlh;
6185 struct nfgenmsg *nfmsg;
6186 char buf[TASK_COMM_LEN];
6187 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
6189 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
6191 goto nla_put_failure;
6193 nfmsg = nlmsg_data(nlh);
6194 nfmsg->nfgen_family = AF_UNSPEC;
6195 nfmsg->version = NFNETLINK_V0;
6196 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
6198 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
6199 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
6200 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
6201 goto nla_put_failure;
6203 nlmsg_end(skb, nlh);
6207 nlmsg_trim(skb, nlh);
6211 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
6212 struct nft_flowtable *flowtable)
6216 for (i = 0; i < flowtable->ops_len; i++) {
6217 if (flowtable->ops[i].dev != dev)
6220 nf_unregister_net_hook(dev_net(dev), &flowtable->ops[i]);
6221 flowtable->ops[i].dev = NULL;
6226 static int nf_tables_flowtable_event(struct notifier_block *this,
6227 unsigned long event, void *ptr)
6229 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
6230 struct nft_flowtable *flowtable;
6231 struct nft_table *table;
6234 if (event != NETDEV_UNREGISTER)
6238 mutex_lock(&net->nft.commit_mutex);
6239 list_for_each_entry(table, &net->nft.tables, list) {
6240 list_for_each_entry(flowtable, &table->flowtables, list) {
6241 nft_flowtable_event(event, dev, flowtable);
6244 mutex_unlock(&net->nft.commit_mutex);
6249 static struct notifier_block nf_tables_flowtable_notifier = {
6250 .notifier_call = nf_tables_flowtable_event,
6253 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
6256 struct nlmsghdr *nlh = nlmsg_hdr(skb);
6257 struct sk_buff *skb2;
6260 if (nlmsg_report(nlh) &&
6261 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6264 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6268 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6275 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6276 nlmsg_report(nlh), GFP_KERNEL);
6279 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6283 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
6284 struct sk_buff *skb, const struct nlmsghdr *nlh,
6285 const struct nlattr * const nla[],
6286 struct netlink_ext_ack *extack)
6288 struct sk_buff *skb2;
6291 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6295 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6300 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
6306 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
6307 [NFT_MSG_NEWTABLE] = {
6308 .call_batch = nf_tables_newtable,
6309 .attr_count = NFTA_TABLE_MAX,
6310 .policy = nft_table_policy,
6312 [NFT_MSG_GETTABLE] = {
6313 .call_rcu = nf_tables_gettable,
6314 .attr_count = NFTA_TABLE_MAX,
6315 .policy = nft_table_policy,
6317 [NFT_MSG_DELTABLE] = {
6318 .call_batch = nf_tables_deltable,
6319 .attr_count = NFTA_TABLE_MAX,
6320 .policy = nft_table_policy,
6322 [NFT_MSG_NEWCHAIN] = {
6323 .call_batch = nf_tables_newchain,
6324 .attr_count = NFTA_CHAIN_MAX,
6325 .policy = nft_chain_policy,
6327 [NFT_MSG_GETCHAIN] = {
6328 .call_rcu = nf_tables_getchain,
6329 .attr_count = NFTA_CHAIN_MAX,
6330 .policy = nft_chain_policy,
6332 [NFT_MSG_DELCHAIN] = {
6333 .call_batch = nf_tables_delchain,
6334 .attr_count = NFTA_CHAIN_MAX,
6335 .policy = nft_chain_policy,
6337 [NFT_MSG_NEWRULE] = {
6338 .call_batch = nf_tables_newrule,
6339 .attr_count = NFTA_RULE_MAX,
6340 .policy = nft_rule_policy,
6342 [NFT_MSG_GETRULE] = {
6343 .call_rcu = nf_tables_getrule,
6344 .attr_count = NFTA_RULE_MAX,
6345 .policy = nft_rule_policy,
6347 [NFT_MSG_DELRULE] = {
6348 .call_batch = nf_tables_delrule,
6349 .attr_count = NFTA_RULE_MAX,
6350 .policy = nft_rule_policy,
6352 [NFT_MSG_NEWSET] = {
6353 .call_batch = nf_tables_newset,
6354 .attr_count = NFTA_SET_MAX,
6355 .policy = nft_set_policy,
6357 [NFT_MSG_GETSET] = {
6358 .call_rcu = nf_tables_getset,
6359 .attr_count = NFTA_SET_MAX,
6360 .policy = nft_set_policy,
6362 [NFT_MSG_DELSET] = {
6363 .call_batch = nf_tables_delset,
6364 .attr_count = NFTA_SET_MAX,
6365 .policy = nft_set_policy,
6367 [NFT_MSG_NEWSETELEM] = {
6368 .call_batch = nf_tables_newsetelem,
6369 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6370 .policy = nft_set_elem_list_policy,
6372 [NFT_MSG_GETSETELEM] = {
6373 .call_rcu = nf_tables_getsetelem,
6374 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6375 .policy = nft_set_elem_list_policy,
6377 [NFT_MSG_DELSETELEM] = {
6378 .call_batch = nf_tables_delsetelem,
6379 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6380 .policy = nft_set_elem_list_policy,
6382 [NFT_MSG_GETGEN] = {
6383 .call_rcu = nf_tables_getgen,
6385 [NFT_MSG_NEWOBJ] = {
6386 .call_batch = nf_tables_newobj,
6387 .attr_count = NFTA_OBJ_MAX,
6388 .policy = nft_obj_policy,
6390 [NFT_MSG_GETOBJ] = {
6391 .call_rcu = nf_tables_getobj,
6392 .attr_count = NFTA_OBJ_MAX,
6393 .policy = nft_obj_policy,
6395 [NFT_MSG_DELOBJ] = {
6396 .call_batch = nf_tables_delobj,
6397 .attr_count = NFTA_OBJ_MAX,
6398 .policy = nft_obj_policy,
6400 [NFT_MSG_GETOBJ_RESET] = {
6401 .call_rcu = nf_tables_getobj,
6402 .attr_count = NFTA_OBJ_MAX,
6403 .policy = nft_obj_policy,
6405 [NFT_MSG_NEWFLOWTABLE] = {
6406 .call_batch = nf_tables_newflowtable,
6407 .attr_count = NFTA_FLOWTABLE_MAX,
6408 .policy = nft_flowtable_policy,
6410 [NFT_MSG_GETFLOWTABLE] = {
6411 .call_rcu = nf_tables_getflowtable,
6412 .attr_count = NFTA_FLOWTABLE_MAX,
6413 .policy = nft_flowtable_policy,
6415 [NFT_MSG_DELFLOWTABLE] = {
6416 .call_batch = nf_tables_delflowtable,
6417 .attr_count = NFTA_FLOWTABLE_MAX,
6418 .policy = nft_flowtable_policy,
6422 static int nf_tables_validate(struct net *net)
6424 struct nft_table *table;
6426 switch (net->nft.validate_state) {
6427 case NFT_VALIDATE_SKIP:
6429 case NFT_VALIDATE_NEED:
6430 nft_validate_state_update(net, NFT_VALIDATE_DO);
6432 case NFT_VALIDATE_DO:
6433 list_for_each_entry(table, &net->nft.tables, list) {
6434 if (nft_table_validate(net, table) < 0)
6443 /* a drop policy has to be deferred until all rules have been activated,
6444 * otherwise a large ruleset that contains a drop-policy base chain will
6445 * cause all packets to get dropped until the full transaction has been
6448 * We defer the drop policy until the transaction has been finalized.
6450 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
6452 struct nft_base_chain *basechain;
6454 if (nft_trans_chain_policy(trans) != NF_DROP)
6457 if (!nft_is_base_chain(trans->ctx.chain))
6460 basechain = nft_base_chain(trans->ctx.chain);
6461 basechain->policy = NF_DROP;
6464 static void nft_chain_commit_update(struct nft_trans *trans)
6466 struct nft_base_chain *basechain;
6468 if (nft_trans_chain_name(trans)) {
6469 rhltable_remove(&trans->ctx.table->chains_ht,
6470 &trans->ctx.chain->rhlhead,
6471 nft_chain_ht_params);
6472 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
6473 rhltable_insert_key(&trans->ctx.table->chains_ht,
6474 trans->ctx.chain->name,
6475 &trans->ctx.chain->rhlhead,
6476 nft_chain_ht_params);
6479 if (!nft_is_base_chain(trans->ctx.chain))
6482 nft_chain_stats_replace(trans);
6484 basechain = nft_base_chain(trans->ctx.chain);
6486 switch (nft_trans_chain_policy(trans)) {
6489 basechain->policy = nft_trans_chain_policy(trans);
6494 static void nft_obj_commit_update(struct nft_trans *trans)
6496 struct nft_object *newobj;
6497 struct nft_object *obj;
6499 obj = nft_trans_obj(trans);
6500 newobj = nft_trans_obj_newobj(trans);
6502 obj->ops->update(obj, newobj);
6507 static void nft_commit_release(struct nft_trans *trans)
6509 switch (trans->msg_type) {
6510 case NFT_MSG_DELTABLE:
6511 nf_tables_table_destroy(&trans->ctx);
6513 case NFT_MSG_NEWCHAIN:
6514 free_percpu(nft_trans_chain_stats(trans));
6515 kfree(nft_trans_chain_name(trans));
6517 case NFT_MSG_DELCHAIN:
6518 nf_tables_chain_destroy(&trans->ctx);
6520 case NFT_MSG_DELRULE:
6521 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6523 case NFT_MSG_DELSET:
6524 nft_set_destroy(nft_trans_set(trans));
6526 case NFT_MSG_DELSETELEM:
6527 nf_tables_set_elem_destroy(&trans->ctx,
6528 nft_trans_elem_set(trans),
6529 nft_trans_elem(trans).priv);
6531 case NFT_MSG_DELOBJ:
6532 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6534 case NFT_MSG_DELFLOWTABLE:
6535 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6540 put_net(trans->ctx.net);
6545 static void nf_tables_trans_destroy_work(struct work_struct *w)
6547 struct nft_trans *trans, *next;
6550 spin_lock(&nf_tables_destroy_list_lock);
6551 list_splice_init(&nf_tables_destroy_list, &head);
6552 spin_unlock(&nf_tables_destroy_list_lock);
6554 if (list_empty(&head))
6559 list_for_each_entry_safe(trans, next, &head, list) {
6560 list_del(&trans->list);
6561 nft_commit_release(trans);
6565 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
6567 struct nft_rule *rule;
6568 unsigned int alloc = 0;
6571 /* already handled or inactive chain? */
6572 if (chain->rules_next || !nft_is_active_next(net, chain))
6575 rule = list_entry(&chain->rules, struct nft_rule, list);
6578 list_for_each_entry_continue(rule, &chain->rules, list) {
6579 if (nft_is_active_next(net, rule))
6583 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
6584 if (!chain->rules_next)
6587 list_for_each_entry_continue(rule, &chain->rules, list) {
6588 if (nft_is_active_next(net, rule))
6589 chain->rules_next[i++] = rule;
6592 chain->rules_next[i] = NULL;
6596 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
6598 struct nft_trans *trans, *next;
6600 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6601 struct nft_chain *chain = trans->ctx.chain;
6603 if (trans->msg_type == NFT_MSG_NEWRULE ||
6604 trans->msg_type == NFT_MSG_DELRULE) {
6605 kvfree(chain->rules_next);
6606 chain->rules_next = NULL;
6611 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
6613 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
6618 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
6620 struct nft_rule **r = rules;
6621 struct nft_rules_old *old;
6626 r++; /* rcu_head is after end marker */
6630 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
6633 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
6635 struct nft_rule **g0, **g1;
6638 next_genbit = nft_gencursor_next(net);
6640 g0 = rcu_dereference_protected(chain->rules_gen_0,
6641 lockdep_commit_lock_is_held(net));
6642 g1 = rcu_dereference_protected(chain->rules_gen_1,
6643 lockdep_commit_lock_is_held(net));
6645 /* No changes to this chain? */
6646 if (chain->rules_next == NULL) {
6647 /* chain had no change in last or next generation */
6651 * chain had no change in this generation; make sure next
6652 * one uses same rules as current generation.
6655 rcu_assign_pointer(chain->rules_gen_1, g0);
6656 nf_tables_commit_chain_free_rules_old(g1);
6658 rcu_assign_pointer(chain->rules_gen_0, g1);
6659 nf_tables_commit_chain_free_rules_old(g0);
6666 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
6668 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
6670 chain->rules_next = NULL;
6676 nf_tables_commit_chain_free_rules_old(g1);
6678 nf_tables_commit_chain_free_rules_old(g0);
6681 static void nft_obj_del(struct nft_object *obj)
6683 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
6684 list_del_rcu(&obj->list);
6687 static void nft_chain_del(struct nft_chain *chain)
6689 struct nft_table *table = chain->table;
6691 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
6692 nft_chain_ht_params));
6693 list_del_rcu(&chain->list);
6696 static void nf_tables_commit_release(struct net *net)
6698 struct nft_trans *trans;
6700 /* all side effects have to be made visible.
6701 * For example, if a chain named 'foo' has been deleted, a
6702 * new transaction must not find it anymore.
6704 * Memory reclaim happens asynchronously from work queue
6705 * to prevent expensive synchronize_rcu() in commit phase.
6707 if (list_empty(&net->nft.commit_list)) {
6708 mutex_unlock(&net->nft.commit_mutex);
6712 trans = list_last_entry(&net->nft.commit_list,
6713 struct nft_trans, list);
6714 get_net(trans->ctx.net);
6715 WARN_ON_ONCE(trans->put_net);
6717 trans->put_net = true;
6718 spin_lock(&nf_tables_destroy_list_lock);
6719 list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
6720 spin_unlock(&nf_tables_destroy_list_lock);
6722 mutex_unlock(&net->nft.commit_mutex);
6724 schedule_work(&trans_destroy_work);
6727 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
6729 struct nft_trans *trans, *next;
6730 struct nft_trans_elem *te;
6731 struct nft_chain *chain;
6732 struct nft_table *table;
6735 if (list_empty(&net->nft.commit_list)) {
6736 mutex_unlock(&net->nft.commit_mutex);
6740 /* 0. Validate ruleset, otherwise roll back for error reporting. */
6741 if (nf_tables_validate(net) < 0)
6744 err = nft_flow_rule_offload_commit(net);
6748 /* 1. Allocate space for next generation rules_gen_X[] */
6749 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6752 if (trans->msg_type == NFT_MSG_NEWRULE ||
6753 trans->msg_type == NFT_MSG_DELRULE) {
6754 chain = trans->ctx.chain;
6756 ret = nf_tables_commit_chain_prepare(net, chain);
6758 nf_tables_commit_chain_prepare_cancel(net);
6764 /* step 2. Make rules_gen_X visible to packet path */
6765 list_for_each_entry(table, &net->nft.tables, list) {
6766 list_for_each_entry(chain, &table->chains, list)
6767 nf_tables_commit_chain(net, chain);
6771 * Bump generation counter, invalidate any dump in progress.
6772 * Cannot fail after this point.
6774 while (++net->nft.base_seq == 0);
6776 /* step 3. Start new generation, rules_gen_X now in use. */
6777 net->nft.gencursor = nft_gencursor_next(net);
6779 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6780 switch (trans->msg_type) {
6781 case NFT_MSG_NEWTABLE:
6782 if (nft_trans_table_update(trans)) {
6783 if (!nft_trans_table_enable(trans)) {
6784 nf_tables_table_disable(net,
6786 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6789 nft_clear(net, trans->ctx.table);
6791 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
6792 nft_trans_destroy(trans);
6794 case NFT_MSG_DELTABLE:
6795 list_del_rcu(&trans->ctx.table->list);
6796 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
6798 case NFT_MSG_NEWCHAIN:
6799 if (nft_trans_chain_update(trans)) {
6800 nft_chain_commit_update(trans);
6801 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6802 /* trans destroyed after rcu grace period */
6804 nft_chain_commit_drop_policy(trans);
6805 nft_clear(net, trans->ctx.chain);
6806 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6807 nft_trans_destroy(trans);
6810 case NFT_MSG_DELCHAIN:
6811 nft_chain_del(trans->ctx.chain);
6812 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
6813 nf_tables_unregister_hook(trans->ctx.net,
6817 case NFT_MSG_NEWRULE:
6818 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6819 nf_tables_rule_notify(&trans->ctx,
6820 nft_trans_rule(trans),
6822 nft_trans_destroy(trans);
6824 case NFT_MSG_DELRULE:
6825 list_del_rcu(&nft_trans_rule(trans)->list);
6826 nf_tables_rule_notify(&trans->ctx,
6827 nft_trans_rule(trans),
6829 nft_rule_expr_deactivate(&trans->ctx,
6830 nft_trans_rule(trans),
6833 case NFT_MSG_NEWSET:
6834 nft_clear(net, nft_trans_set(trans));
6835 /* This avoids hitting -EBUSY when deleting the table
6836 * from the transaction.
6838 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
6839 !list_empty(&nft_trans_set(trans)->bindings))
6840 trans->ctx.table->use--;
6842 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6843 NFT_MSG_NEWSET, GFP_KERNEL);
6844 nft_trans_destroy(trans);
6846 case NFT_MSG_DELSET:
6847 list_del_rcu(&nft_trans_set(trans)->list);
6848 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6849 NFT_MSG_DELSET, GFP_KERNEL);
6851 case NFT_MSG_NEWSETELEM:
6852 te = (struct nft_trans_elem *)trans->data;
6854 te->set->ops->activate(net, te->set, &te->elem);
6855 nf_tables_setelem_notify(&trans->ctx, te->set,
6857 NFT_MSG_NEWSETELEM, 0);
6858 nft_trans_destroy(trans);
6860 case NFT_MSG_DELSETELEM:
6861 te = (struct nft_trans_elem *)trans->data;
6863 nf_tables_setelem_notify(&trans->ctx, te->set,
6865 NFT_MSG_DELSETELEM, 0);
6866 te->set->ops->remove(net, te->set, &te->elem);
6867 atomic_dec(&te->set->nelems);
6870 case NFT_MSG_NEWOBJ:
6871 if (nft_trans_obj_update(trans)) {
6872 nft_obj_commit_update(trans);
6873 nf_tables_obj_notify(&trans->ctx,
6874 nft_trans_obj(trans),
6877 nft_clear(net, nft_trans_obj(trans));
6878 nf_tables_obj_notify(&trans->ctx,
6879 nft_trans_obj(trans),
6881 nft_trans_destroy(trans);
6884 case NFT_MSG_DELOBJ:
6885 nft_obj_del(nft_trans_obj(trans));
6886 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6889 case NFT_MSG_NEWFLOWTABLE:
6890 nft_clear(net, nft_trans_flowtable(trans));
6891 nf_tables_flowtable_notify(&trans->ctx,
6892 nft_trans_flowtable(trans),
6893 NFT_MSG_NEWFLOWTABLE);
6894 nft_trans_destroy(trans);
6896 case NFT_MSG_DELFLOWTABLE:
6897 list_del_rcu(&nft_trans_flowtable(trans)->list);
6898 nf_tables_flowtable_notify(&trans->ctx,
6899 nft_trans_flowtable(trans),
6900 NFT_MSG_DELFLOWTABLE);
6901 nft_unregister_flowtable_net_hooks(net,
6902 nft_trans_flowtable(trans));
6907 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
6908 nf_tables_commit_release(net);
6913 static void nf_tables_abort_release(struct nft_trans *trans)
6915 switch (trans->msg_type) {
6916 case NFT_MSG_NEWTABLE:
6917 nf_tables_table_destroy(&trans->ctx);
6919 case NFT_MSG_NEWCHAIN:
6920 nf_tables_chain_destroy(&trans->ctx);
6922 case NFT_MSG_NEWRULE:
6923 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6925 case NFT_MSG_NEWSET:
6926 nft_set_destroy(nft_trans_set(trans));
6928 case NFT_MSG_NEWSETELEM:
6929 nft_set_elem_destroy(nft_trans_elem_set(trans),
6930 nft_trans_elem(trans).priv, true);
6932 case NFT_MSG_NEWOBJ:
6933 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6935 case NFT_MSG_NEWFLOWTABLE:
6936 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6942 static int __nf_tables_abort(struct net *net)
6944 struct nft_trans *trans, *next;
6945 struct nft_trans_elem *te;
6947 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
6949 switch (trans->msg_type) {
6950 case NFT_MSG_NEWTABLE:
6951 if (nft_trans_table_update(trans)) {
6952 if (nft_trans_table_enable(trans)) {
6953 nf_tables_table_disable(net,
6955 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6957 nft_trans_destroy(trans);
6959 list_del_rcu(&trans->ctx.table->list);
6962 case NFT_MSG_DELTABLE:
6963 nft_clear(trans->ctx.net, trans->ctx.table);
6964 nft_trans_destroy(trans);
6966 case NFT_MSG_NEWCHAIN:
6967 if (nft_trans_chain_update(trans)) {
6968 free_percpu(nft_trans_chain_stats(trans));
6969 kfree(nft_trans_chain_name(trans));
6970 nft_trans_destroy(trans);
6972 trans->ctx.table->use--;
6973 nft_chain_del(trans->ctx.chain);
6974 nf_tables_unregister_hook(trans->ctx.net,
6979 case NFT_MSG_DELCHAIN:
6980 trans->ctx.table->use++;
6981 nft_clear(trans->ctx.net, trans->ctx.chain);
6982 nft_trans_destroy(trans);
6984 case NFT_MSG_NEWRULE:
6985 trans->ctx.chain->use--;
6986 list_del_rcu(&nft_trans_rule(trans)->list);
6987 nft_rule_expr_deactivate(&trans->ctx,
6988 nft_trans_rule(trans),
6991 case NFT_MSG_DELRULE:
6992 trans->ctx.chain->use++;
6993 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6994 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
6995 nft_trans_destroy(trans);
6997 case NFT_MSG_NEWSET:
6998 trans->ctx.table->use--;
6999 if (nft_trans_set_bound(trans)) {
7000 nft_trans_destroy(trans);
7003 list_del_rcu(&nft_trans_set(trans)->list);
7005 case NFT_MSG_DELSET:
7006 trans->ctx.table->use++;
7007 nft_clear(trans->ctx.net, nft_trans_set(trans));
7008 nft_trans_destroy(trans);
7010 case NFT_MSG_NEWSETELEM:
7011 if (nft_trans_elem_set_bound(trans)) {
7012 nft_trans_destroy(trans);
7015 te = (struct nft_trans_elem *)trans->data;
7016 te->set->ops->remove(net, te->set, &te->elem);
7017 atomic_dec(&te->set->nelems);
7019 case NFT_MSG_DELSETELEM:
7020 te = (struct nft_trans_elem *)trans->data;
7022 nft_set_elem_activate(net, te->set, &te->elem);
7023 te->set->ops->activate(net, te->set, &te->elem);
7026 nft_trans_destroy(trans);
7028 case NFT_MSG_NEWOBJ:
7029 if (nft_trans_obj_update(trans)) {
7030 kfree(nft_trans_obj_newobj(trans));
7031 nft_trans_destroy(trans);
7033 trans->ctx.table->use--;
7034 nft_obj_del(nft_trans_obj(trans));
7037 case NFT_MSG_DELOBJ:
7038 trans->ctx.table->use++;
7039 nft_clear(trans->ctx.net, nft_trans_obj(trans));
7040 nft_trans_destroy(trans);
7042 case NFT_MSG_NEWFLOWTABLE:
7043 trans->ctx.table->use--;
7044 list_del_rcu(&nft_trans_flowtable(trans)->list);
7045 nft_unregister_flowtable_net_hooks(net,
7046 nft_trans_flowtable(trans));
7048 case NFT_MSG_DELFLOWTABLE:
7049 trans->ctx.table->use++;
7050 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
7051 nft_trans_destroy(trans);
7058 list_for_each_entry_safe_reverse(trans, next,
7059 &net->nft.commit_list, list) {
7060 list_del(&trans->list);
7061 nf_tables_abort_release(trans);
7067 static void nf_tables_cleanup(struct net *net)
7069 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
7072 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
7074 int ret = __nf_tables_abort(net);
7076 mutex_unlock(&net->nft.commit_mutex);
7081 static bool nf_tables_valid_genid(struct net *net, u32 genid)
7085 mutex_lock(&net->nft.commit_mutex);
7087 genid_ok = genid == 0 || net->nft.base_seq == genid;
7089 mutex_unlock(&net->nft.commit_mutex);
7091 /* else, commit mutex has to be released by commit or abort function */
7095 static const struct nfnetlink_subsystem nf_tables_subsys = {
7096 .name = "nf_tables",
7097 .subsys_id = NFNL_SUBSYS_NFTABLES,
7098 .cb_count = NFT_MSG_MAX,
7100 .commit = nf_tables_commit,
7101 .abort = nf_tables_abort,
7102 .cleanup = nf_tables_cleanup,
7103 .valid_genid = nf_tables_valid_genid,
7104 .owner = THIS_MODULE,
7107 int nft_chain_validate_dependency(const struct nft_chain *chain,
7108 enum nft_chain_types type)
7110 const struct nft_base_chain *basechain;
7112 if (nft_is_base_chain(chain)) {
7113 basechain = nft_base_chain(chain);
7114 if (basechain->type->type != type)
7119 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
7121 int nft_chain_validate_hooks(const struct nft_chain *chain,
7122 unsigned int hook_flags)
7124 struct nft_base_chain *basechain;
7126 if (nft_is_base_chain(chain)) {
7127 basechain = nft_base_chain(chain);
7129 if ((1 << basechain->ops.hooknum) & hook_flags)
7137 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
7140 * Loop detection - walk through the ruleset beginning at the destination chain
7141 * of a new jump until either the source chain is reached (loop) or all
7142 * reachable chains have been traversed.
7144 * The loop check is performed whenever a new jump verdict is added to an
7145 * expression or verdict map or a verdict map is bound to a new chain.
7148 static int nf_tables_check_loops(const struct nft_ctx *ctx,
7149 const struct nft_chain *chain);
7151 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
7152 struct nft_set *set,
7153 const struct nft_set_iter *iter,
7154 struct nft_set_elem *elem)
7156 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
7157 const struct nft_data *data;
7159 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
7160 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
7163 data = nft_set_ext_data(ext);
7164 switch (data->verdict.code) {
7167 return nf_tables_check_loops(ctx, data->verdict.chain);
7173 static int nf_tables_check_loops(const struct nft_ctx *ctx,
7174 const struct nft_chain *chain)
7176 const struct nft_rule *rule;
7177 const struct nft_expr *expr, *last;
7178 struct nft_set *set;
7179 struct nft_set_binding *binding;
7180 struct nft_set_iter iter;
7182 if (ctx->chain == chain)
7185 list_for_each_entry(rule, &chain->rules, list) {
7186 nft_rule_for_each_expr(expr, last, rule) {
7187 struct nft_immediate_expr *priv;
7188 const struct nft_data *data;
7191 if (strcmp(expr->ops->type->name, "immediate"))
7194 priv = nft_expr_priv(expr);
7195 if (priv->dreg != NFT_REG_VERDICT)
7199 switch (data->verdict.code) {
7202 err = nf_tables_check_loops(ctx,
7203 data->verdict.chain);
7212 list_for_each_entry(set, &ctx->table->sets, list) {
7213 if (!nft_is_active_next(ctx->net, set))
7215 if (!(set->flags & NFT_SET_MAP) ||
7216 set->dtype != NFT_DATA_VERDICT)
7219 list_for_each_entry(binding, &set->bindings, list) {
7220 if (!(binding->flags & NFT_SET_MAP) ||
7221 binding->chain != chain)
7224 iter.genmask = nft_genmask_next(ctx->net);
7228 iter.fn = nf_tables_loop_check_setelem;
7230 set->ops->walk(ctx, set, &iter);
7240 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
7242 * @attr: netlink attribute to fetch value from
7243 * @max: maximum value to be stored in dest
7244 * @dest: pointer to the variable
7246 * Parse, check and store a given u32 netlink attribute into variable.
7247 * This function returns -ERANGE if the value goes over maximum value.
7248 * Otherwise a 0 is returned and the attribute value is stored in the
7249 * destination variable.
7251 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
7255 val = ntohl(nla_get_be32(attr));
7262 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
7265 * nft_parse_register - parse a register value from a netlink attribute
7267 * @attr: netlink attribute
7269 * Parse and translate a register value from a netlink attribute.
7270 * Registers used to be 128 bit wide, these register numbers will be
7271 * mapped to the corresponding 32 bit register numbers.
7273 unsigned int nft_parse_register(const struct nlattr *attr)
7277 reg = ntohl(nla_get_be32(attr));
7279 case NFT_REG_VERDICT...NFT_REG_4:
7280 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
7282 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
7285 EXPORT_SYMBOL_GPL(nft_parse_register);
7288 * nft_dump_register - dump a register value to a netlink attribute
7290 * @skb: socket buffer
7291 * @attr: attribute number
7292 * @reg: register number
7294 * Construct a netlink attribute containing the register number. For
7295 * compatibility reasons, register numbers being a multiple of 4 are
7296 * translated to the corresponding 128 bit register numbers.
7298 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
7300 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
7301 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
7303 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
7305 return nla_put_be32(skb, attr, htonl(reg));
7307 EXPORT_SYMBOL_GPL(nft_dump_register);
7310 * nft_validate_register_load - validate a load from a register
7312 * @reg: the register number
7313 * @len: the length of the data
7315 * Validate that the input register is one of the general purpose
7316 * registers and that the length of the load is within the bounds.
7318 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
7320 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7324 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
7329 EXPORT_SYMBOL_GPL(nft_validate_register_load);
7332 * nft_validate_register_store - validate an expressions' register store
7334 * @ctx: context of the expression performing the load
7335 * @reg: the destination register number
7336 * @data: the data to load
7337 * @type: the data type
7338 * @len: the length of the data
7340 * Validate that a data load uses the appropriate data type for
7341 * the destination register and the length is within the bounds.
7342 * A value of NULL for the data means that its runtime gathered
7345 int nft_validate_register_store(const struct nft_ctx *ctx,
7346 enum nft_registers reg,
7347 const struct nft_data *data,
7348 enum nft_data_types type, unsigned int len)
7353 case NFT_REG_VERDICT:
7354 if (type != NFT_DATA_VERDICT)
7358 (data->verdict.code == NFT_GOTO ||
7359 data->verdict.code == NFT_JUMP)) {
7360 err = nf_tables_check_loops(ctx, data->verdict.chain);
7367 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7371 if (reg * NFT_REG32_SIZE + len >
7372 FIELD_SIZEOF(struct nft_regs, data))
7375 if (data != NULL && type != NFT_DATA_VALUE)
7380 EXPORT_SYMBOL_GPL(nft_validate_register_store);
7382 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
7383 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
7384 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
7385 .len = NFT_CHAIN_MAXNAMELEN - 1 },
7388 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
7389 struct nft_data_desc *desc, const struct nlattr *nla)
7391 u8 genmask = nft_genmask_next(ctx->net);
7392 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
7393 struct nft_chain *chain;
7396 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
7397 nft_verdict_policy, NULL);
7401 if (!tb[NFTA_VERDICT_CODE])
7403 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
7405 switch (data->verdict.code) {
7407 switch (data->verdict.code & NF_VERDICT_MASK) {
7422 if (!tb[NFTA_VERDICT_CHAIN])
7424 chain = nft_chain_lookup(ctx->net, ctx->table,
7425 tb[NFTA_VERDICT_CHAIN], genmask);
7427 return PTR_ERR(chain);
7428 if (nft_is_base_chain(chain))
7432 data->verdict.chain = chain;
7436 desc->len = sizeof(data->verdict);
7437 desc->type = NFT_DATA_VERDICT;
7441 static void nft_verdict_uninit(const struct nft_data *data)
7443 switch (data->verdict.code) {
7446 data->verdict.chain->use--;
7451 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
7453 struct nlattr *nest;
7455 nest = nla_nest_start_noflag(skb, type);
7457 goto nla_put_failure;
7459 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
7460 goto nla_put_failure;
7465 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
7467 goto nla_put_failure;
7469 nla_nest_end(skb, nest);
7476 static int nft_value_init(const struct nft_ctx *ctx,
7477 struct nft_data *data, unsigned int size,
7478 struct nft_data_desc *desc, const struct nlattr *nla)
7488 nla_memcpy(data->data, nla, len);
7489 desc->type = NFT_DATA_VALUE;
7494 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
7497 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
7500 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
7501 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
7502 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
7506 * nft_data_init - parse nf_tables data netlink attributes
7508 * @ctx: context of the expression using the data
7509 * @data: destination struct nft_data
7510 * @size: maximum data length
7511 * @desc: data description
7512 * @nla: netlink attribute containing data
7514 * Parse the netlink data attributes and initialize a struct nft_data.
7515 * The type and length of data are returned in the data description.
7517 * The caller can indicate that it only wants to accept data of type
7518 * NFT_DATA_VALUE by passing NULL for the ctx argument.
7520 int nft_data_init(const struct nft_ctx *ctx,
7521 struct nft_data *data, unsigned int size,
7522 struct nft_data_desc *desc, const struct nlattr *nla)
7524 struct nlattr *tb[NFTA_DATA_MAX + 1];
7527 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
7528 nft_data_policy, NULL);
7532 if (tb[NFTA_DATA_VALUE])
7533 return nft_value_init(ctx, data, size, desc,
7534 tb[NFTA_DATA_VALUE]);
7535 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
7536 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
7539 EXPORT_SYMBOL_GPL(nft_data_init);
7542 * nft_data_release - release a nft_data item
7544 * @data: struct nft_data to release
7545 * @type: type of data
7547 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7548 * all others need to be released by calling this function.
7550 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
7552 if (type < NFT_DATA_VERDICT)
7555 case NFT_DATA_VERDICT:
7556 return nft_verdict_uninit(data);
7561 EXPORT_SYMBOL_GPL(nft_data_release);
7563 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
7564 enum nft_data_types type, unsigned int len)
7566 struct nlattr *nest;
7569 nest = nla_nest_start_noflag(skb, attr);
7574 case NFT_DATA_VALUE:
7575 err = nft_value_dump(skb, data, len);
7577 case NFT_DATA_VERDICT:
7578 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
7585 nla_nest_end(skb, nest);
7588 EXPORT_SYMBOL_GPL(nft_data_dump);
7590 int __nft_release_basechain(struct nft_ctx *ctx)
7592 struct nft_rule *rule, *nr;
7594 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
7597 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
7598 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
7599 list_del(&rule->list);
7601 nf_tables_rule_release(ctx, rule);
7603 nft_chain_del(ctx->chain);
7605 nf_tables_chain_destroy(ctx);
7609 EXPORT_SYMBOL_GPL(__nft_release_basechain);
7611 static void __nft_release_tables(struct net *net)
7613 struct nft_flowtable *flowtable, *nf;
7614 struct nft_table *table, *nt;
7615 struct nft_chain *chain, *nc;
7616 struct nft_object *obj, *ne;
7617 struct nft_rule *rule, *nr;
7618 struct nft_set *set, *ns;
7619 struct nft_ctx ctx = {
7621 .family = NFPROTO_NETDEV,
7624 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
7625 ctx.family = table->family;
7627 list_for_each_entry(chain, &table->chains, list)
7628 nf_tables_unregister_hook(net, table, chain);
7629 /* No packets are walking on these chains anymore. */
7631 list_for_each_entry(chain, &table->chains, list) {
7633 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
7634 list_del(&rule->list);
7636 nf_tables_rule_release(&ctx, rule);
7639 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
7640 list_del(&flowtable->list);
7642 nf_tables_flowtable_destroy(flowtable);
7644 list_for_each_entry_safe(set, ns, &table->sets, list) {
7645 list_del(&set->list);
7647 nft_set_destroy(set);
7649 list_for_each_entry_safe(obj, ne, &table->objects, list) {
7652 nft_obj_destroy(&ctx, obj);
7654 list_for_each_entry_safe(chain, nc, &table->chains, list) {
7656 nft_chain_del(chain);
7658 nf_tables_chain_destroy(&ctx);
7660 list_del(&table->list);
7661 nf_tables_table_destroy(&ctx);
7665 static int __net_init nf_tables_init_net(struct net *net)
7667 INIT_LIST_HEAD(&net->nft.tables);
7668 INIT_LIST_HEAD(&net->nft.commit_list);
7669 mutex_init(&net->nft.commit_mutex);
7670 net->nft.base_seq = 1;
7671 net->nft.validate_state = NFT_VALIDATE_SKIP;
7676 static void __net_exit nf_tables_exit_net(struct net *net)
7678 mutex_lock(&net->nft.commit_mutex);
7679 if (!list_empty(&net->nft.commit_list))
7680 __nf_tables_abort(net);
7681 __nft_release_tables(net);
7682 mutex_unlock(&net->nft.commit_mutex);
7683 WARN_ON_ONCE(!list_empty(&net->nft.tables));
7686 static struct pernet_operations nf_tables_net_ops = {
7687 .init = nf_tables_init_net,
7688 .exit = nf_tables_exit_net,
7691 static int __init nf_tables_module_init(void)
7695 spin_lock_init(&nf_tables_destroy_list_lock);
7696 err = register_pernet_subsys(&nf_tables_net_ops);
7700 err = nft_chain_filter_init();
7704 err = nf_tables_core_module_init();
7708 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
7712 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
7716 err = nft_offload_init();
7721 err = nfnetlink_subsys_register(&nf_tables_subsys);
7725 nft_chain_route_init();
7731 rhltable_destroy(&nft_objname_ht);
7733 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7735 nf_tables_core_module_exit();
7737 nft_chain_filter_fini();
7739 unregister_pernet_subsys(&nf_tables_net_ops);
7743 static void __exit nf_tables_module_exit(void)
7745 nfnetlink_subsys_unregister(&nf_tables_subsys);
7747 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7748 nft_chain_filter_fini();
7749 nft_chain_route_fini();
7750 unregister_pernet_subsys(&nf_tables_net_ops);
7751 cancel_work_sync(&trans_destroy_work);
7753 rhltable_destroy(&nft_objname_ht);
7754 nf_tables_core_module_exit();
7757 module_init(nf_tables_module_init);
7758 module_exit(nf_tables_module_exit);
7760 MODULE_LICENSE("GPL");
7761 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
7762 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);